2025年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

EOF



cat > server_cert.conf << EOF  

[ req ]

distinguished_name     = req_distinguished_name

prompt                 = no



[ req_distinguished_name ]

 O                      = $PROJECT_NAME

 CN                     = 192.168.199.188

EOF



cat > client_cert.conf << EOF  

[ req ]

distinguished_name     = req_distinguished_name

prompt                 = no



[ req_distinguished_name ]

 O                      = $PROJECT_NAME Device Certificate

 CN                     = 192.168.199.168

EOF



mkdir 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.key







openssl 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.der





mv 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

2025年mqtt支持加密通讯

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