💬 Security & Signing

[pepson]

Hi
I have a gateway mysensors on my RPI3 with radio RFM69HW. Is any chance to build gateway on RPI3 but also with chip ATSHA204A ? And how build it...

[Anticimex]

@pepson the driver has not been designed with rPi in mind. And you'd probably be better off with an I2C variant for rPi. But we currently don't offer a driver for that so you'd have to write it yourself.
But, for a gw, you typically keep those secured physically, so using a atsha device is less important, compared to "roaming" nodes.

[pepson]

@anticimex
I don't understand. I want secure my nodes... By Atsha204a. How I can secure it by other solution.

[Anticimex]

@pepson I have implemented a sw emulator for the atsha which offers compatible security infrastructure but without readout protection. Readout protection is needed if someone steals your node and extracts your hmac key. Your gw won't typically be stolen, so it don't need readout protection and can rely on the soft signing option which is compatible with nodes using atsha204a personalized with the same hmac key. The rPi port support the atsha204a emulator so you can use that to secure nodes that has a real atsha204a device.

[pepson]

@anticimex

Can you show me full manual how implement it on Gateway on RPI and how add this to sketch on nodes ? Please...
If you can describe me very good. I am begginer...

[Anticimex]

@pepson you have the links to the documentation in the article this thread is commenting on. At the very top.

[pepson]

@anticimex
But please show me as you have to have example...

[Anticimex]

@pepson I don't run on raspberry pi so I don't. But the documentation does have specific configuration examples for raspberry pi, so you have all information needed listed there in "how to use this" section.

[sineverba]

@pepson see here for 2.2.0 and on left menu for 2.3.0

https://github.com/sineverba/domapi/wiki/MySensors-2.2.0-Security-and-signin

[pepson]

@sineverba
Very very good manuals...
But i dont understand what i must type number in this placeand how get it ? It is MAC number network from RPI ?:

#define MY_SIGNING_NODE_WHITELISTING {{.nodeId = GATEWAY_ADDRESS,.serial = {0Xaa,0Xbb,0Xcc,0XF9,0X82,0XB2,0X50,0XF2,0XAB}}} // got from gateway setup

And what is diffrent with MySensors 2.3.0 ?
I must do all point from MySensors 2.2.0 and additional point for 2.3.0 ?

After got your ./configure instruction, type
sudo nano /etc/mysensors.conf
And add your KEYs to the specific section on bottom of the file.
To get your first KEYs follow guide for 2.2.0

And in version 2.3.0 i must do this under building gateway ?

And add serial,HMAC,AES in this place in mysensors.conf

Software signing settings

Note: The gateway must have been built with signing

support to use the options below.

To generate a HMAC key run mysgw with: --gen-soft-hmac-key

copy the new key in the line below and uncomment it.

#soft_hmac_key=

To generate a serial key run mysgw with: --gen-soft-serial-key

copy the new key in the line below and uncomment it.

#soft_serial_key=

Encryption settings

Note: The gateway must have been built with encryption

support to use the options below.

To generate a AES key run mysgw with: --gen-aes-key

copy the new key in the line below and uncomment it.

#aes_key=

and then build gateway ?

[sineverba]

@pepson You use RFM69(H/W/HW). So I. My hint is remain with 2.2.0. I got so many issues with 2.3.0 and RFM that I reverted to 2.2.0 in 1 minute.

HMAC is not LAN MAC, is HMAC got from MYsensors gateway. Same for other 2 keyes.

I think that in long explain on my guide you have all info to get your keyes. I follow my same guide everytime I need to reinstall mysensors / domoticz / an entire PI. It is fully tested :)

[pepson]

@sineverba
Hi
Yes i use radio RFM69HW. I also on 2.3.0 have big problem... and back to 2.2.0. What you have problem on 2.3.0 with radio RFM69 ?

I read all your guide and it is ok. But i dont know what i must put in place:
#define MY_SIGNING_NODE_WHITELISTING {{.nodeId = GATEWAY_ADDRESS,.serial = {0Xaa,0Xbb,0Xcc,0XF9,0X82,0XB2,0X50,0XF2,0XAB}}} // got from gateway setup

Put serial from this:
sudo mysgw --gen-soft-serial-key

We will get:

SOFT_SERIAL | 7850987FA6601F6538

The next line is intended to be used in SecurityPersonalizer.ino:
#define MY_SOFT_SERIAL 0X78,0X50,0X98,0X7F,0XA6,0X60,0X1F,0X65,0X38

To use this key, run mysgw with:
--set-soft-serial-key=7850987FA6601F6538

And i must put my keys to mysensors.conf when i use version 2.2.0 ? Or only when use 2.3.0 ?

Software signing settings
Note: The gateway must have been built with signing
support to use the options below.
To generate a HMAC key run mysgw with: --gen-soft-hmac-key
copy the new key in the line below and uncomment it.
#soft_hmac_key=

To generate a serial key run mysgw with: --gen-soft-serial-key
copy the new key in the line below and uncomment it.
#soft_serial_key=

Encryption settings
Note: The gateway must have been built with encryption
support to use the options below.
To generate a AES key run mysgw with: --gen-aes-key
copy the new key in the line below and uncomment it.
#aes_key=

or only send command

sudo mysgw --set-soft-serial-key=7850987FA6601F6538 && sudo mysgw --set-aes-key=768859210B4A75FACC78B757ADAFE75B && sudo mysgw --set-soft-hmac-key=0298FF121DD3194BCC33DC8185055B9D981EBE0A90D847A4777A9E65CCE4F524 ?

[sineverba]

@pepson

Too many ack lost and slow communication. And other that I don't remember.

That line on the sketches means that you need add on the node that you want whitelist the serial of gateway.

You got serial gateway on the steps for 2.2.0.

You have it.

You don't need to put anything in no file with 2.2.0. In my guide is NOT mentioned. In my guide, at the bottom, there is the final "set keyes" with only a line OR you can set them everytime you get them.

Please, take your time to read 1, 2, 3 times before type anything. I think it is very clear, and every step is write down for you.

;) Enjoy :)

PS Don't offend, I want help you, 'cause I used a bit of times before getting security working. And I used so many time write down a guide. But you need to read and follow carefully

[pepson]

@sineverba I also have the same problem with communication. But tell me you send issue to developer ? I send but nothing done.

Ok in point 4 in your guide in sketch for node i must put serial key from gateway ? Yes ?

And tell me how remove setup serial, HMAC and AES when i dont want to use it ? How remove it from gateway ?
Thanks

[pepson]

Any help ?

[sineverba]

@pepson no need to remove. Simply, in your sketches, don't use signing at all.

[pepson]

@sineverba said in 💬 Security & Signing:

no need to remove. Simply, in your sketches, don't use signing at all.

ok but if on gateway it was generate and setup keys and when in skethces i dont use keys will nody connect? and what the purpose of the signature is then ?
I thought that if the gate has a set of keys and will try to connect noda without a key that it will not connect ....

[sineverba]

@pepson you can use a special flag define to "downgrade/reduce" security MY_WEAK_SECURITY

[pepson]

@sineverba

Ok summary
When i have setup on Raspberry Gateway , generate keys.

When i write in node all keys with sketches.... Node connect ok.

But when write to node only sketches without keys.,... node connect to gateway or not connect to gateway ?

[sineverba]

@pepson you need to setup gateway with weak security.

You need generate keyes and set in gateway.

You need to personalize nodes with the sketch and set keyes on Arduino EEPROM.

From now, you have two ways: Your node need security? Set use security bla-bla on top with other define(s).

Don't Need security? Don't define use security.

Simpler than ever.