mqtt支持加密通讯

1. mqtt第三方库支持openssl
a, 编译openssl库（我使用的是1.0.1），在mqtt源码目录下创建openssl文件夹，并拷贝编译完成的库文件与头文件到此文件夹下。
b, 修改mqtt（源码从git上获取https://github.com/eclipse/paho.mqtt.c.git ）编译选项，PAHO_WITH_SSL，OPENSSL_SEARCH_PATH。修改后需要重新清除，重新编译。

2. mosquitto支持openssl
a, 通过apt-get install mosquitto安装的mosquitto默认关闭了ssl相关功能
b, 通过git（https://github.com/eclipse/mosquitto.git）重新安装编译mosquitto
c, mosquitto 配置，启动命令mosquitto -c mosquitto.conf -v

port 8883
cafile /home/mosquitto_logs/certificate/ca/ca.crt
certfile /home/mosquitto_logs/certificate/server/server.crt
keyfile /home/mosquitto_logs/certificate/server/server.key

3. 自己创建需要的认证文件
a, pc端安装openssl
b, 使用generate.sh脚本创建认证文件，生成pem

# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# * Neither the name of the axTLS project nor the names of its
#   contributors may be used to endorse or promote products derived
#   from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
# Generate the certificates and keys for testing.
#PROJECT_NAME="TLS Project"# Generate the openssl configuration files.
cat > ca_cert.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no[ req_distinguished_name ]O                      = $PROJECT_NAME Dodgy Certificate Authority
EOFcat > server_cert.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no[ req_distinguished_name ]O                      = $PROJECT_NAMECN                     = 192.168.199.188
EOFcat > client_cert.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no[ req_distinguished_name ]O                      = $PROJECT_NAME Device CertificateCN                     = 192.168.199.168
EOFmkdir ca
mkdir server
mkdir client
mkdir certDER# private key generation
openssl genrsa -out ca.key 1024
openssl genrsa -out server.key 1024
openssl genrsa -out client.key 1024# cert requests
openssl req -out ca.req -key ca.key -new \-config ./ca_cert.conf
openssl req -out server.req -key server.key -new \-config ./server_cert.conf 
openssl req -out client.req -key client.key -new \-config ./client_cert.conf # generate the actual certs.
openssl x509 -req -in ca.req -out ca.crt \-sha1 -days 5000 -signkey ca.key
openssl x509 -req -in server.req -out server.crt \-sha1 -CAcreateserial -days 5000 \-CA ca.crt -CAkey ca.key
openssl x509 -req -in client.req -out client.crt \-sha1 -CAcreateserial -days 5000 \-CA ca.crt -CAkey ca.keyopenssl x509 -in ca.crt -outform DER -out ca.der
openssl x509 -in server.crt -outform DER -out server.der
openssl x509 -in client.crt -outform DER -out client.dermv ca.crt ca.key ca/
mv server.crt server.key server/
mv client.crt client.key client/mv ca.der server.der client.der certDER/rm *.conf
rm *.req
rm *.srl

c, rm_ssl.sh

rm ca/ -rf
rm certDER/ -rf
rm client/ -rf
rm server/ -rf

d, 不使用脚本生成认证文件

openssl genrsa -des3 -out ca.key 2048
openssl req -new -x509 -days 3650 -key ca.key -out ca.crt
openssl genrsa -out server.key 2048
openssl req -new -out server.csr -key server.key
openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 3600

e, 方便统一操作，对文件目录结构操作

certificate
├── ca
│   ├── ca.crt
│   ├── ca.key
│   └── ca.srl
└── server├── server.crt├── server.csr└── server.key

4. Linux下两个终端通讯
a, mosquitto_sub -h 192.168.199.188 -p 8883 -t echo_on –cafile ca/ca.crt –cert client/client.crt –key client/client.key
b, mosquitto_pub -h 192.168.199.188 -p 8883 -t echo_on -m "temperature:15" –cafile ca/ca.crt –cert client/client.crt –key client/client.key
c, 实际效果同预期一致

5. 方便抓wireshark包，Linux终端同windows mqttfx通讯
a, linux下终端连接，参考列项4
b, mqtt fx针对ssl的配置如下
使用列项3中bc方法生成的认证文件如下配置

使用列表3中de方法生成的认证文件如下配置

c, wireshark抓包截图
使用tsl

未使用tls

参考：https://blog.csdn.net/espressif/article/details/78541435
https://baijiahao.baidu.com/s?id=1610669918084024139&wfr=spider&for=pc

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