CyaSSL_DTLS_Ethernet - CyaSSL example using x509 certs and DTLS over eth…

Users » ashleymills » Code » CyaSSL_DTLS_Ethernet

CyaSSL example using x509 certs and DTLS over ethernet.

Dependencies: EthernetInterface NTPClient cyassl-lib mbed-rtos mbed-src CyaSSL_DTLS_Ethernet

Testing DTLS out

To test this client you need to setup a server and use the correct CA certificate, server certificate, and server private key. This will allow the client to authenticate to the server, and enable the server to authenticate the client. The server can authenticate the client because the test program includes a device certificate signed by the server CA.

The server certificate and and CA certificate are identical as this is a self-signed certificate:

The server private key is as follows:

Both the certificate and the private key are in PEM format. It is worth noting that all the certificates and keys on the device are in DER format to save space. You might be wondering how to easily get PEM keys and certs into a format suitable for the mbed, well it's easy, you can just use the openssl tools to convert, and then xxd to get a hex sequence which you can put into an array. To convert a cert, use the following command:

openssl x509 -in cert.pem -outform DER | xxd -i

This will dump the x509 cert in DER format and pipe it to xxd, where the -i switch is used to convert the byte sequence into c-include style. All it really does is dump the bytes in hexadecimal, you still need to wrap it in an array like this:

const static unsigned char deviceCertificate[] = {
   OUTPUT OF ABOVE
};
const static int deviceCertificateLength = sizeof(deviceCertificate);

For converting keys, the command is the same buy you use the rsa subcommand of openssl (or dsa if you used DSA keys):

openssl rsa -in key.pem -outform DER | xxd -i

In anycase, to use the PEM files with the CyaSSL server, download the CyaSSL example server from here: http://yassl.com/yaSSL/download/downloadForm.php. Configure it with debugging and dtls before compiling (I've also enabled PSK because I'm testing that):

./configure --enable-psk --enable-debug --enable-dtls

Then do

make

Now, the cyaSSL server needs the PEM certificates above to work with those setup on the mbed device, but it is particular about where these PEM certs are found. You need to put them in the certs directory in the root of the unzipped code (it seems to ignore flags which point it elsewhere).

And for some reason cyaSSL calls the CA certificate the "client-cert.pem", so copy the server certificate above into "certs/client-cert.pem" and also copy it into "certs/server-cert.pem". Copy the server private key into "certs/server-key.pem".

Now change directory into example/server/ and run the server like this:

./server -u -b -f

These flags are -u for UDP i.e DTLS, -b to bind to all interfaces, and -f to group messages (fewer packets). For some reason this last flag is needed to work properly with the mbed.

You should now be able to fire up the mbed, change the code to point to your server, and see the handshake and test messages go back and forth. You can see it works because you should see the message "I hear you fa shizzle!" on the mbed (this is the message they define), and you should see the message "onion" received on the server.

Generating your own keys and certificates

OK so you want to generate your own self-signed certificate for your server and device. Great, but I'm too busy/lazy to write a detailed tutorial right now. Instead I've created you a shell script that randomly generates a new self-signed CA/server-cert and uses this to sign a device certificate.

The device certificate and private key are placed into a directory called mbed/certs where as the server certs are placed in server/certs. You'll have to read up on these commands to work out how to generate and sign more device certs, and how to change options etc. HTH.

#!/bin/sh
CA_KEY_FILE=ca_key.pem
CA_KEY_FORMAT=PEM
CA_KEY_ALGORITHM=rsa
CA_KEY_BITS=1024
# 1. Make a key for the CA (in this case the server)
echo Generating $CA_KEY_ALGORITHM key: $CA_KEY_FILE
openssl genpkey \
	-out $CA_KEY_FILE \
	-outform $CA_KEY_FORMAT \
	-algorithm $CA_KEY_ALGORITHM \
	-pkeyopt rsa_keygen_bits:$CA_KEY_BITS
echo DONE 
# extract public key (for vanity)
openssl pkey \
	-in $CA_KEY_FILE \
	-pubout \
	-out $CA_KEY_FILE.pub

# 2. Make a self signed certificate for the CA (trusted certificate)
# req - PKCS#10 certificate request and certificate generating utility.
CA_CERT_EXPIRY=3600
CA_CERT_SERIAL=0x1111
CA_CERT_FILE=ca_cert.pem
CA_CERT_REQ=ca_cert_req.pem
CA_ID=DMServer
echo Generating self signed root CA certificate: $CA_CERT_FILE
openssl req \
	-new \
	-key $CA_KEY_FILE \
	-days $CA_CERT_EXPIRY \
	-set_serial $CA_CERT_SERIAL \
	-subj "/C=GB/ST=Berkshire/L=Newbury/O=Vodafone/OU=R&D/CN=$CA_ID" \
	-out $CA_CERT_FILE \
	-x509 \
	-verbose 
echo DONE.

# 3. Make a key for the device
DEV_KEY_FILE=dev_key.pem
DEV_KEY_FORMAT=PEM
DEV_KEY_ALGORITHM=rsa
DEV_KEY_BITS=1024
echo Generating $DEV_KEY_ALGORITHM key: $DEV_KEY_FILE
openssl genpkey \
	-out $DEV_KEY_FILE \
	-outform $DEV_KEY_FORMAT \
	-algorithm $DEV_KEY_ALGORITHM \
	-pkeyopt rsa_keygen_bits:$DEV_KEY_BITS
echo DONE 
# extract public key (for vanity)
openssl pkey \
	-in $DEV_KEY_FILE \
	-pubout \
	-out $DEV_KEY_FILE.pub

# 4. Make a certificate request for the device
DEV_CERT_EXPIRY=3600
DEV_CERT_SERIAL=2222
DEV_CERT_REQ_FILE=dev_cert_req.pem
DEV_CERT_FILE=dev_cert.pem
DEV_ID=Device1
echo Generating certificate request for device: $DEV_CERT_REQ_FILE
openssl req \
	-new \
	-key $DEV_KEY_FILE \
	-days $DEV_CERT_EXPIRY \
	-set_serial $DEV_CERT_SERIAL \
	-subj "/C=GB/ST=Berkshire/L=Newbury/O=Vodafone/OU=R&D/CN=$DEV_ID" \
	-out $DEV_CERT_REQ_FILE \
	-verbose 

echo DONE.

# 5. Sign the device certificate using the root CA certificate
echo Creating directories and other stuff I really wish was not needed
mkdir -p demoCA/newcerts
touch demoCA/index.txt
echo $DEV_CERT_SERIAL > demoCA/serial
echo DONE.
# do the actual signing
echo Signing certificate request $DEV_CERT_REQ_FILE with certificate $CA_CERT_FILE
openssl ca \
	-in $DEV_CERT_REQ_FILE \
	-out $DEV_CERT_FILE \
	-days $DEV_CERT_EXPIRY \
	-keyfile $CA_KEY_FILE \
	-cert $CA_CERT_FILE \
	-batch \
	-verbose

echo DONE.

# 6 convert this stuff into a format suitable for mbed
echo Creating mbed include files
MBED_DIR=mbed/certs
mkdir -p $MBED_DIR
# private key
OUT=$MBED_DIR/device_private_key.h
echo "#pragma once" > $OUT
echo "const static unsigned char devicePrivateKey[] = {" >> $OUT
openssl $DEV_KEY_ALGORITHM -in $DEV_KEY_FILE -outform DER | xxd -i >> $OUT
echo "};" >> $OUT
echo "const static int devicePrivateKeyLength = sizeof(devicePrivateKey);" >> $OUT

# device cert
OUT=$MBED_DIR/device_certificate.h
echo "#pragma once" > $OUT
echo "const static unsigned char deviceCertificate[] = {" >> $OUT
openssl x509 -in $DEV_CERT_FILE -outform DER | xxd -i >> $OUT
echo "};" >> $OUT
echo "const static int deviceCertificateLength = sizeof(deviceCertificate);" >> $OUT

# CA cert
OUT=$MBED_DIR/root_certificate.h
echo "#pragma once" > $OUT
echo "const static unsigned char rootCertificate[] = {" >> $OUT
openssl x509 -in $CA_CERT_FILE -outform DER | xxd -i >> $OUT
echo "};" >> $OUT
echo "const static int rootCertificateLength = sizeof(rootCertificate);" >> $OUT
echo DONE.

# create (copy) the server files for CyaSSL
echo Creating PEM file structure of CyaSSL server
OUT=server/certs
mkdir -p $OUT
cp $CA_CERT_FILE $OUT/client_cert.pem
cp $CA_CERT_FILE $OUT/server_cert.pem
cp $CA_KEY_FILE $OUT/server_key.pem
echo DONE.

certs/device_private_key.h

Committer:: ashleymills
Date:: 2013-09-05
Revision:: 0:00174d07d068

File content as of revision 0:00174d07d068:

  #pragma once
  
  const static unsigned char devicePrivateKey[] = {
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  0xd1, 0xf8, 0x41, 0x9d, 0xca, 0x3d, 0xc5, 0x90, 0x6e, 0x61, 0x32, 0xe9,
  0xd0, 0x43, 0x12, 0x67, 0x70, 0x01, 0x45, 0x8d, 0xbd, 0xe3, 0x0a, 0x30,
  0x06, 0xd0, 0x0e, 0xd4, 0x75, 0xff, 0x4b, 0x1f, 0xf8, 0x2d, 0xf9, 0xe1,
  0x72, 0x60, 0xb3, 0xbd, 0x60, 0x4c, 0x3e, 0x00, 0xf1, 0x0e, 0x23, 0x19,
  0x7f, 0x5a, 0xfe, 0x61, 0x86, 0x13, 0x02, 0x41, 0x00, 0xd5, 0xb7, 0x46,
  0xdf, 0xe6, 0xfc, 0x0e, 0x79, 0xea, 0xf5, 0x4f, 0x4b, 0x58, 0x0e, 0xa0,
  0x4a, 0x15, 0x52, 0xde, 0x4a, 0x08, 0xc1, 0x46, 0xc0, 0x25, 0x14, 0x64,
  0x15, 0x9a, 0x3d, 0xd4, 0x64, 0x6a, 0xad, 0x70, 0x87, 0x86, 0x6a, 0x32,
  0x16, 0x2d, 0xcb, 0xc1, 0x12, 0x4b, 0xfb, 0xf6, 0x64, 0x4f, 0x8d, 0x17,
  0xfc, 0x68, 0xe8, 0xba, 0xfb, 0xd9, 0x5c, 0x77, 0x18, 0xc5, 0xbe, 0x9d,
  0xf3, 0x02, 0x41, 0x00, 0xbb, 0x44, 0x12, 0xcb, 0x2c, 0x82, 0x41, 0xc1,
  0x1f, 0x73, 0xb3, 0xf2, 0x3d, 0x85, 0x67, 0xce, 0x0b, 0x00, 0x85, 0xcf,
  0x7b, 0x30, 0x8a, 0x8f, 0xc7, 0x66, 0x09, 0xf1, 0x23, 0xb4, 0xd4, 0xae,
  0x71, 0x00, 0x8c, 0x3e, 0x4c, 0x5f, 0xa2, 0x73, 0xbe, 0x9f, 0x70, 0xe8,
  0xb9, 0x58, 0xba, 0x99, 0xb7, 0x50, 0xa4, 0x17, 0xa2, 0xf3, 0x6e, 0xdc,
  0xb9, 0xe2, 0x22, 0xc4, 0xcd, 0x8f, 0x44, 0x3b, 0x02, 0x41, 0x00, 0xaa,
  0x4f, 0xe3, 0x50, 0x5d, 0x60, 0x33, 0x1d, 0x1f, 0x8c, 0x1c, 0x83, 0xdb,
  0x89, 0xd4, 0x5d, 0x15, 0x7f, 0x33, 0x9c, 0x66, 0x3b, 0xb8, 0x69, 0x39,
  0x63, 0x75, 0x9a, 0xed, 0x8f, 0x26, 0x6a, 0x5b, 0xc5, 0x19, 0xef, 0x36,
  0xc3, 0xfc, 0x64, 0x46, 0x5c, 0xa0, 0xe1, 0x36, 0xe2, 0x75, 0x69, 0x5d,
  0x28, 0x00, 0x9c, 0x6a, 0xf2, 0x44, 0xc8, 0x9d, 0x60, 0x9d, 0x9c, 0x85,
  0x41, 0xb1, 0xd7, 0x02, 0x40, 0x71, 0xf2, 0xf4, 0x2f, 0x5f, 0xe7, 0x9a,
  0x81, 0x43, 0x6b, 0x37, 0xa9, 0x92, 0x29, 0x0a, 0x64, 0xaf, 0x82, 0x8a,
  0x3d, 0x6a, 0x93, 0xb6, 0xd8, 0xb3, 0xd6, 0x8c, 0xd8, 0xf3, 0x66, 0xbd,
  0x9b, 0x59, 0x86, 0x23, 0xf5, 0xae, 0xaa, 0x3c, 0xcd, 0xc2, 0xdc, 0x91,
  0x16, 0x43, 0xdd, 0xec, 0x85, 0x4b, 0x7d, 0x4f, 0xc5, 0x27, 0xb5, 0x1f,
  0x04, 0x7e, 0xb6, 0x42, 0x75, 0x0a, 0x10, 0xcb, 0x38
  
};

const static int devicePrivateKeyLength = sizeof(devicePrivateKey);

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Type:	Program
Created:	05 Sep 2013
Imports:	37
Forks:	0
Commits:	5
Dependents:	1
Dependencies:	6
Followers:	4
Issues:	0

The code in this repository is MIT licensed.