Modbus/TCP Security implemantation and API funcs

- Client/Server for ESP8266
- Client for ESP32 (not tested)
- TLS exmample (including demo cerificates)
- API extended to allow connect to TCP/TLS server by name (for ESP and
Ethernet both)
- non-STL mode appeas to be broken

README.md

@@ -1,4 +1,4 @@
-# Modbus RTU and Modbus TCP Library for Arduino
+# Modbus RTU and Modbus TCP Library for ESP8266/ESP32
 
 |If the library is helpful for your projects you can support it by a glass of beer|[![paypal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z38SLGAKGM93S&source=url)|
 |---|---|
@@ -63,15 +63,20 @@ For more information about Modbus see:
 
 ```diff
 // 4.0.0.DEVEL
-- Modbus TCP Security Server
-- Test: TLS Server
-- Modbus TCP Security Client
-- Test: TLS Client
-+ STL dependency remove
++ ModbusTLS: Modbus TCP Security Client/Server
++ ModbusTLS: ESP8266 Client/Server
++ Test: TLS ESP8266 Client/Server
++ Examples: TLS added
+- Examples: TLS Certificate test Role extension and Alt-Name
+- Examples: TLS Add example explanation
+- ModbusTLS: ESP32 Client
+- Test: TLS ESP32 Client
+- Build with no STL dependency
 - Test: No-STL mode
-+ W5x00 Ethernet library support
++ ModbusTCP: ModbusEthernet - W5x00 Ethernet library support
 - Test: W5x00 support
 + API: Implementation code merge
++ API: Access ModbusTCP server by name 
 + ModbusIP => ModbusTCP
 + 0x14 - Read File Records function
 + Test: 0x14

examples/TLS/README.md

@@ -0,0 +1,3 @@
+# Modbus\TCP Security for ESP8266 Example
+
+*This is just a draft*

examples/TLS/certs/ca.conf

@@ -0,0 +1,11 @@
+[ req ]
+prompt = no
+default_bits = 2048
+distinguished_name = req_dn
+x509_extensions = v3_req
+
+[ req_dn ]
+CN = root_ca
+
+[v3_req]
+basicConstraints=CA:TRUE

examples/TLS/certs/ca_cer.pem

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----
+MIICwjCCAaqgAwIBAgIUTz9NFtf8JkdIkrDroXVB/ANtqlYwDQYJKoZIhvcNAQEL
+BQAwEjEQMA4GA1UEAwwHcm9vdF9jYTAeFw0yMDA4MjcxMDI4MzFaFw0zMTExMTQx
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+yHObfUNN6saco1/f4OM4tzaQOKa+6U1iXVBTBjE2IHPchGqctBk=
+-----END CERTIFICATE-----

examples/TLS/certs/ca_cer.srl

@@ -0,0 +1 @@
+4221D52EC27B0A950D9F41EFC7D20A43100E437D

examples/TLS/certs/ca_key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

examples/TLS/certs/cert.cmd

@@ -0,0 +1,17 @@
+set OPATH=C:\Program Files\OpenSSL-Win64\bin
+
+rem CA
+"%OPATH%\openssl" genrsa -out ca_key.pem 2048
+"%OPATH%\openssl" req -x509 -new -nodes -key ca_key.pem -days 4096 -config ca.conf -out ca_cer.pem
+
+rem SERVER
+"%OPATH%\openssl" genrsa -out server_key.pem 2048
+"%OPATH%\openssl" req -out server_req.csr -key server_key.pem -new -config server.conf
+"%OPATH%\openssl" x509 -req -in server_req.csr -out server_cer.pem -sha256 -CAcreateserial -days 4000 -CA ca_cer.pem -CAkey ca_key.pem
+"%OPATH%\openssl" rsa -in server_key.pem -pubout -out server_pubkey.pem
+
+rem CLIENT
+"%OPATH%\openssl" genrsa -out client1_key.pem 2048
+"%OPATH%\openssl" req -out client1_req.csr -key client1_key.pem -new -config client.conf
+"%OPATH%\openssl" x509 -req -in client1_req.csr -out client1_cer.pem -sha256 -CAcreateserial -days 4000 -CA ca_cer.pem -CAkey ca_key.pem
+

examples/TLS/certs/client.cmd

@@ -0,0 +1 @@
+openssl s_client -showcerts -connect 192.168.30.123:802 -cert client1_cer.pem -key client1_key.pem -verifyCAfile ca_cer.pem

examples/TLS/certs/client.conf

@@ -0,0 +1,7 @@
+[ req ]
+prompt = no
+default_bits = 2048
+distinguished_name = req_dn
+
+[ req_dn ]
+CN = client

examples/TLS/certs/client1_cer.pem

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----
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+hJmblVkcv6VRNS9JHDQ=
+-----END CERTIFICATE-----

examples/TLS/certs/client1_key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----

examples/TLS/certs/client1_req.csr

@@ -0,0 +1,15 @@
+-----BEGIN CERTIFICATE REQUEST-----
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+-----END CERTIFICATE REQUEST-----

examples/TLS/certs/server.cmd

@@ -0,0 +1 @@
+openssl s_server -showcerts -accept 802 -cert server_cer.pem -key server_key.pem -verifyCAfile ca_cer.pem

examples/TLS/certs/server.conf

@@ -0,0 +1,7 @@
+[ req ]
+prompt = no
+default_bits = 2048
+distinguished_name = req_dn
+
+[ req_dn ]
+CN = modbustls

examples/TLS/certs/server_cer.pem

@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

examples/TLS/certs/server_key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+sBfP8fvlHqJ6wA9/W2l+YiIf3G2jY2Z8OlOINs3hdXpH0JBzoeEiFwfcfZPAMFb1
+M4JURmEGAriH2lw/5iMQ/YqB9+NoE8t8lBLrhjwXWxN3qxoSruwe
+-----END RSA PRIVATE KEY-----

examples/TLS/certs/server_pubkey.pem

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3SpcCq8sUhAbBztc+X69
+H+miV/Dxw9SH7X5Gtz09vOcEaDQnD2uXk6OXQUsiTPSYCqahrHZtjO1AQCWQBQUo
+EIvvqUbjbLLM2tblK3tvE9zx1eOtzpmue5hX6SJShny/61blJaruIoDSIEE/8ECZ
+sSTvLQ61mk4zM+FYAjZBuMtb3niKc+/wsvUuQsRCgW4m0J3KVF8leLU0/Tt+6s3t
+Bq/ne3658skzra/NAMDDINT5+tYWW5LvRC/1RNd6FlQQUl89HsR1RvF/TXuLsrsh
+txwFoXoJYUO5tkZAcU5A1aJUn+nnNV4J99eQTAhtXgUwGSjXUUUq+PsetKeO0Xml
+iQIDAQAB
+-----END PUBLIC KEY-----

examples/TLS/certs/server_req.csr

@@ -0,0 +1,15 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----