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Merge pull request #6 from slaff/feature/lwip-raw
Initial support for LWIP raw tcp mode.
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‎tools/make_certs.sh

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#!/bin/sh
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#
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# Copyright (c) 2007, Cameron Rich
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the axTLS project nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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AXDIR=`pwd`/`dirname $0`
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CWD=`mktemp -d` && cd $dir
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cd $CWD
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#
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# Generate the certificates and keys for testing.
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#
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PROJECT_NAME="axTLS Project"
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# Generate the openssl configuration files.
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cat > ca_cert.conf << EOF
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[ req ]
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distinguished_name = req_distinguished_name
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prompt = no
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[ req_distinguished_name ]
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O = $PROJECT_NAME Dodgy Certificate Authority
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EOF
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cat > certs.conf << EOF
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[ req ]
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distinguished_name = req_distinguished_name
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prompt = no
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[ req_distinguished_name ]
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O = $PROJECT_NAME
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CN = 127.0.0.1
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EOF
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cat > device_cert.conf << EOF
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[ req ]
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distinguished_name = req_distinguished_name
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prompt = no
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[ req_distinguished_name ]
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O = $PROJECT_NAME Device Certificate
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EOF
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# private key generation
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openssl genrsa -out axTLS.ca_key.pem 1024
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openssl genrsa -out axTLS.key_512.pem 512
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openssl genrsa -out axTLS.key_1024.pem 1024
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openssl genrsa -out axTLS.key_1042.pem 1042
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openssl genrsa -out axTLS.key_2048.pem 2048
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openssl genrsa -out axTLS.key_4096.pem 4096
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openssl genrsa -out axTLS.device_key.pem 1024
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openssl genrsa -aes128 -passout pass:abcd -out axTLS.key_aes128.pem 512
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openssl genrsa -aes256 -passout pass:abcd -out axTLS.key_aes256.pem 512
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# convert private keys into DER format
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openssl rsa -in axTLS.key_512.pem -out axTLS.key_512 -outform DER
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openssl rsa -in axTLS.key_1024.pem -out axTLS.key_1024 -outform DER
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openssl rsa -in axTLS.key_1042.pem -out axTLS.key_1042 -outform DER
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openssl rsa -in axTLS.key_2048.pem -out axTLS.key_2048 -outform DER
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openssl rsa -in axTLS.key_4096.pem -out axTLS.key_4096 -outform DER
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openssl rsa -in axTLS.device_key.pem -out axTLS.device_key -outform DER
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# cert requests
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openssl req -out axTLS.ca_x509.req -key axTLS.ca_key.pem -new \
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-config ./ca_cert.conf
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openssl req -out axTLS.x509_512.req -key axTLS.key_512.pem -new \
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-config ./certs.conf
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openssl req -out axTLS.x509_1024.req -key axTLS.key_1024.pem -new \
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-config ./certs.conf
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openssl req -out axTLS.x509_1042.req -key axTLS.key_1042.pem -new \
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-config ./certs.conf
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openssl req -out axTLS.x509_2048.req -key axTLS.key_2048.pem -new \
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-config ./certs.conf
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openssl req -out axTLS.x509_4096.req -key axTLS.key_4096.pem -new \
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-config ./certs.conf
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openssl req -out axTLS.x509_device.req -key axTLS.device_key.pem -new \
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-config ./device_cert.conf
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openssl req -out axTLS.x509_aes128.req -key axTLS.key_aes128.pem \
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-new -config ./certs.conf -passin pass:abcd
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openssl req -out axTLS.x509_aes256.req -key axTLS.key_aes256.pem \
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-new -config ./certs.conf -passin pass:abcd
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# generate the actual certs.
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openssl x509 -req -in axTLS.ca_x509.req -out axTLS.ca_x509.pem \
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-sha1 -days 5000 -signkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_512.req -out axTLS.x509_512.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_1024.req -out axTLS.x509_1024.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_1042.req -out axTLS.x509_1042.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_2048.req -out axTLS.x509_2048.pem \
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-md5 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_4096.req -out axTLS.x509_4096.pem \
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-md5 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_device.req -out axTLS.x509_device.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.x509_512.pem -CAkey axTLS.key_512.pem
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openssl x509 -req -in axTLS.x509_aes128.req \
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-out axTLS.x509_aes128.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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openssl x509 -req -in axTLS.x509_aes256.req \
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-out axTLS.x509_aes256.pem \
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-sha1 -CAcreateserial -days 5000 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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# note: must be root to do this
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DATE_NOW=`date`
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if date -s "Jan 1 2025"; then
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openssl x509 -req -in axTLS.x509_512.req -out axTLS.x509_bad_before.pem \
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-sha1 -CAcreateserial -days 365 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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date -s "$DATE_NOW"
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touch axTLS.x509_bad_before.pem
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fi
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openssl x509 -req -in axTLS.x509_512.req -out axTLS.x509_bad_after.pem \
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-sha1 -CAcreateserial -days -365 \
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-CA axTLS.ca_x509.pem -CAkey axTLS.ca_key.pem
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# some cleanup
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rm axTLS*.req
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rm axTLS.srl
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rm *.conf
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# need this for the client tests
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openssl x509 -in axTLS.ca_x509.pem -outform DER -out axTLS.ca_x509.cer
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openssl x509 -in axTLS.x509_512.pem -outform DER -out axTLS.x509_512.cer
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openssl x509 -in axTLS.x509_1024.pem -outform DER -out axTLS.x509_1024.cer
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openssl x509 -in axTLS.x509_1042.pem -outform DER -out axTLS.x509_1042.cer
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openssl x509 -in axTLS.x509_2048.pem -outform DER -out axTLS.x509_2048.cer
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openssl x509 -in axTLS.x509_4096.pem -outform DER -out axTLS.x509_4096.cer
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openssl x509 -in axTLS.x509_device.pem -outform DER -out axTLS.x509_device.cer
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# generate pkcs8 files (use RC4-128 for encryption)
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openssl pkcs8 -in axTLS.key_512.pem -passout pass:abcd -topk8 -v1 PBE-SHA1-RC4-128 -out axTLS.encrypted_pem.p8
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openssl pkcs8 -in axTLS.key_512.pem -passout pass:abcd -topk8 -outform DER -v1 PBE-SHA1-RC4-128 -out axTLS.encrypted.p8
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openssl pkcs8 -in axTLS.key_512.pem -nocrypt -topk8 -out axTLS.unencrypted_pem.p8
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openssl pkcs8 -in axTLS.key_512.pem -nocrypt -topk8 -outform DER -out axTLS.unencrypted.p8
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# generate pkcs12 files (use RC4-128 for encryption)
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openssl pkcs12 -export -in axTLS.x509_1024.pem -inkey axTLS.key_1024.pem -certfile axTLS.ca_x509.pem -keypbe PBE-SHA1-RC4-128 -certpbe PBE-SHA1-RC4-128 -name "p12_with_CA" -out axTLS.withCA.p12 -password pass:abcd
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openssl pkcs12 -export -in axTLS.x509_1024.pem -inkey axTLS.key_1024.pem -keypbe PBE-SHA1-RC4-128 -certpbe PBE-SHA1-RC4-128 -name "p12_without_CA" -out axTLS.withoutCA.p12 -password pass:abcd
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openssl pkcs12 -export -in axTLS.x509_1024.pem -inkey axTLS.key_1024.pem -keypbe PBE-SHA1-RC4-128 -certpbe PBE-SHA1-RC4-128 -out axTLS.noname.p12 -password pass:abcd
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# PEM certificate chain
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cat axTLS.ca_x509.pem >> axTLS.x509_device.pem
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# set default key/cert for use in the server
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xxd -i axTLS.x509_1024.cer | sed -e \
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"s/axTLS_x509_1024_cer/default_certificate/" > $AXDIR/../ssl/cert.h
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xxd -i axTLS.key_1024 | sed -e \
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"s/axTLS_key_1024/default_private_key/" > $AXDIR/../ssl/private_key.h

‎util/README.md

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If you are using [LWIP raw tcp mode](http://lwip.wikia.com/wiki/Raw/TCP) and want to add SSL support below are the steps that can help you to achieve this with the help of [axTLS]( http://axtls.sourceforge.net/ ).
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First you have to include the `lwipr_compat.h` header.
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```C
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#include "util/lwipr_compat.h"
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```
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Then in the code block where you initialize the tcp raw connection you should call `axl_init`.
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Take a look at the example below:
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```C
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lwip_init();
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/*
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* The line below should be added AFTER the lwip_init code
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* AND BEFORE the call to tcp_new()
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* The parameter value 10 specifies how many SSL connections are expected
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*/
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axl_init(10);
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// .. some more code
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tcp = tcp_new();
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tcp_sent(tcp, staticOnSent);
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tcp_recv(tcp, staticOnReceive);
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tcp_err(tcp, staticOnError);
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tcp_poll(tcp, staticOnPoll, 4);
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// ... and even more code
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res = tcp_connect(tcp, &addr, port, staticOnConnected);
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```
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Now we should add in our `staticOnConnected` funciton code to create new ssl context and ssl object.
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In the example below the `sslObj` and `sslContext` are defined as global
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```C
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// global definitions
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SSL *sslObj = NULL;
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SSLCTX* sslContext = NULL;
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// and some more code...
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err_t staticOnConnected(void *arg, struct tcp_pcb *tcp, err_t err)
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{
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int clientfd = -1;
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uint32_t options = 0;
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if (tcp == NULL) {
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/* @TODO: Take care to handle error conditions */
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return -1;
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}
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clientfd = axl_append(tcp);
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if(clientfd == -1) {
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printf("Unable to add LWIP tcp -> clientfd mapping\n");
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return ERR_OK;
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}
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printf("Connected: ClientId: %d\n", clientfd);
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#ifdef SSL_DEBUG
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options |= SSL_DISPLAY_STATES | SSL_DISPLAY_BYTES;
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#endif
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// if you want to verify the server certificate later you can also add the following option
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options |= SSL_SERVER_VERIFY_LATER
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sslContext = ssl_ctx_new(SSL_CONNECT_IN_PARTS | options, 1); // !!! SSL_CONNECT_IN_PARTS must be in the flags !!!
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sslObj = ssl_client_new(sslContext, clientfd, NULL, 0);
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return ERR_OK;
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}
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```
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Once we are connected we can send and receive information. For the receiving part we can do the following
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```C
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err_t staticOnReceive(void *arg, struct tcp_pcb *tcp, struct pbuf *p, err_t err)
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{
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uint8_t *read_buf = NULL;
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int read_bytes = 0;
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printf("Err: %d\n", err);
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if(tcp == NULL || p == NULL) {
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/* @TODO: Take care to handle error conditions */
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return -1;
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}
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read_bytes = axl_ssl_read(sslObj, &read_buf, tcp, p);
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if(read_bytes > 0) {
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printf("Got data: %s", read_buf);
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// @TODO: Do something useful with the read_buf
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}
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return ERR_OK;
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}
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```
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In the receiving part you can also add debug code to display more information about the SSL handshake, once it was successul.
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```C
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err_t staticOnReceive(void *arg, struct tcp_pcb *tcp, struct pbuf *p, err_t err)
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{
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static int show_info = 0;
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const char *common_name = NULL;
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// ..
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read_bytes = axl_ssl_read(sslObj, &read_buf, tcp, p);
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if(read_bytes > 0) {
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printf("Got data: %s", read_buf);
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// @TODO: Do something useful with the read_buf
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}
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if(!show_info && ssl_handshake_status(sslObj) == SSL_OK) {
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common_name = ssl_get_cert_dn(sslObj, SSL_X509_CERT_COMMON_NAME);
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if (common_name) {
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printf("Common Name:\t\t\t%s\n", common_name);
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}
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// These two funcitons below can be found in the axtls examples
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display_session_id(sslObj);
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display_cipher(sslObj);
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show_info = 1;
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}
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return ERR_OK;
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}
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```
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And for the sending part we can use the following code sample as a start
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```C
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void someSendingfunction() {
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uint8_t *out_buf;
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int out_bytes = 0;
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// ... take care to store something in the out_buf
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axl_ssl_write(sslObj, out_buf, out_bytes);
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}
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```
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Good luck and send your success stories at [email protected].

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