需求背景
需要在linux环境中安装配置mqtt broker，并配置用户名、密码访问及tls加密传输认证；
准备资料
1、centos 6.5 64bit
2、mosquitto1.4.4版本
安装mqtt broker服务
1、解压源码包tar xvf mosquitto-1.4.14.tar.gz
2、进入源码目录，编辑config.mk文件：
分别修改
WITH_SRV:=no —->WITH_SRV:=yes
WITH_UUID:=no —->WITH_UUID:=yes
3、安装必要依赖包
yum install gcc gcc-c++ openssl-devel
4、make && make install 安装即可；
5、启动服务
5.1、默认路径
mqtt broker服务默认安装在/usr/local/bin
配置文件默认在/etc/mosquitto
5.2、添加基本配置
cd /etc/mosquitto/进入配置文件目录；
cp mosquitto.conf.example mosquitto.conf，拷贝基本配置文件；
执行mosquitto -c /etc/mosquitto/mosquitto.conf -v启动服务；
会报错，如下：
1600225060: mosquitto version 1.4.14 (build date 2020-09-16 10:51:44+0800) starting
1600225060: Config loaded from /etc/mosquitto/mosquitto.conf.
1600225060: Opening ipv4 listen socket on port 1883.
1600225060: Opening ipv6 listen socket on port 1883.
1600225060: Error: Invalid user ‘mosquitto’.
默认是用mosquitto帐号启动，添加帐号即可；
useradd mosquitto，然后再启动
看到如下信息，说明broker已经启动成功；
1600225144: mosquitto version 1.4.14 (build date 2020-09-16 10:51:44+0800) starting
1600225144: Config loaded from /etc/mosquitto/mosquitto.conf.
1600225144: Opening ipv4 listen socket on port 1883.
1600225144: Opening ipv6 listen socket on port 1883.
6、验证订阅、发布功能是否正常
6.1、订阅
执行命令：mosquitto_sub -h 127.0.0.1 -p 1883 -t ‘/mqttbroker/test’
mosquitto_sub: error while loading shared libraries: libmosquitto.so.1: cannot open shared object file: No such file or directory
报错了，是libmosquitto.so.1库找不到问题，只需要添加到加载搜索的环境变量即可；
默认安装时，libmosquitto.so安装到了/usr/local/lib路径，所以只需要将这个路径添加到ldconfig搜索的路径就行；
echo ‘/usr/local/lib’ > /etc/ld.so.conf.d/local-lib.conf，然后再ldconfig -v | grep mosquitto，看到如下信息，则说明加载成功，再次执行订阅命令；
libmosquitto.so.1 -> libmosquitto.so.1
libmosquittopp.so.1 -> libmosquittopp.so.1
6.2、发布消息
执行命令：mosquitto_pub -h 127.0.0.1 -p 1883 -t ‘/mqttbroker/test’ -m ‘hello mqtt’，如果上面的订阅能够收到消息，则说明没问题；如果不成功，则
根据broker终端打印的消息进一步定位问题；
配置用户名密码访问
1、修改allow_anonymous参数
编辑/etc/mosquitto/mosquitto.conf文件，找到allow_anonymous参数
修改前：#allow_anonymous true
修改后：allow_anonymous false
2、修改password_file参数
编辑/etc/mosquitto/mosquitto.conf文件，找到password_file参数
修改前：#password_file
修改后：password_file /etc/mosquitto/pwfile
3、创建帐号、密码
mosquitto_passwd -c /etc/mosquitto/pwfile test-mqtt-passwd1
Password: 123456
Reenter password:123456
创建测试帐号：test-mqtt-passwd1，密码123456
cat /etc/mosquitto/pwfile查看刚刚创建的帐号
test-mqtt-passwd1:$6$tkJEQ7rGxhb9OH3j$Nvbc7lru78BvWris7Eas6n4fsLya/c6OS+0Au7IklNrrTjbfZd6yNBGT6PrM92BkFjl5b37o+ZvXiOP2nUIUGg==
4、验证
4.1、订阅
mosquitto_sub -h 127.0.0.1 -p 1883 -t ‘/mqttbroker/test’ -u ‘test-mqtt-passwd1’ -P ‘123456’
4.2、发布
mosquitto_pub -h 127.0.0.1 -p 1883 -t ‘/mqttbroker/test’ -m ‘hello mqtt passwd’ -u ‘test-mqtt-passwd1’ -P ‘123456’
订阅端可以正常收到的话，则说明用户名密码配置成功；如果不用用户名密码或填写错误，则会报如下错误提示
Connection Refused: not authorised.
Error: The connection was refused.
配置tls加密双向认证
1、生成CA的key和证书文件
1.1、生成ca的密钥文件
openssl genrsa -des3 -out ca.key 2048
Generating RSA private key, 2048 bit long modulus
……..+++
………………………………………+++
e is 65537 (0x10001)
Enter pass phrase for ca.key:123456789
Verifying – Enter pass phrase for ca.key:123456789
1.2、生成ca证书
openssl req -new -x509 -days 1826 -key ca.key -out ca.crt
Enter pass phrase for ca.key:8AN1Y9m)>|pF2GC.8)2SU.kNHBr(LyI
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,If you enter ‘.’, the field will be left blank.
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:test-pn
Locality Name (eg, city) [Default City]:test-ln
Organization Name (eg, company) [Default Company Ltd]:test-on
Organizational Unit Name (eg, section) []:test-oun
Common Name (eg, your name or your server’s hostname) []:0.0.0.0
Email Address []:testemail@test.com
2、生成server端证书
2.1、生成server私钥
openssl genrsa -out server.key 2048
Generating RSA private key, 2048 bit long modulus
…………………………………………………..+++
…………………………………………………………..+++
e is 65537 (0x10001)
2.2、生成server端请求文件（.csr)
openssl req -new -out server.csr -key server.key
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,If you enter ‘.’, the field will be left blank.
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:test-pn
Locality Name (eg, city) [Default City]:test-ln
Organization Name (eg, company) [Default Company Ltd]:test-on
Organizational Unit Name (eg, section) []:test-oun
Common Name (eg, your name or your server’s hostname) []:服务端的域名或IP
Email Address []:testemail@test.com
Please enter the following ‘extra’ attributes
to be sent with your certificate request
A challenge password []:1234567890AABBCC
An optional company name []:test-cn
2.3、生成服务端的证书
openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 3650
Signature ok
subject=/C=CN/ST=fj/L=xm/O=wtbl/OU=wtbl/CN=服务端的域名或IP/emailAddress=testemail@test.com
Getting CA Private Key
Enter pass phrase for ca.key:123456789
3、生成client端证书
3.1、生成client的私钥
openssl genrsa -out client.key 2048
Generating RSA private key, 2048 bit long modulus
………………………..+++
……….+++
e is 65537 (0x10001)
3.2、生成client端请求文件（.csr)
openssl req -new -out client.csr -key client.key
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,If you enter ‘.’, the field will be left blank.
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:test-pn
Locality Name (eg, city) [Default City]:test-ln
Organization Name (eg, company) [Default Company Ltd]:test-on
Organizational Unit Name (eg, section) []:test-oun
Common Name (eg, your name or your server’s hostname) []:服务端的域名或IP
Email Address []:testemail@test.com
Please enter the following ‘extra’ attributes
to be sent with your certificate request
A challenge password []:1234567890CCBBAA
An optional company name []:test-cn
3.3、生成client端的证书
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 3650
Signature ok
subject=/C=CN/ST=fj/L=xm/O=wtbl/OU=wtbl/CN=服务端的域名或IP/emailAddress=testemail@test.com
Getting CA Private Key
Enter pass phrase for ca.key:123456789
最后生成的文件如下
ca.crt ca.key ca.srl client.crt client.csr client.key server.crt server.csr server.key
4、修改mosquitto配置文件
4.1、添加tls认证访问的端口
编辑/etc/mosquitto/mosquitto.conf文件，找到# Certificate based SSL/TLS support
添加listener 2883
2、修改cafile参数
编辑/etc/mosquitto/mosquitto.conf文件，在上面添加的listener参数下方添加
cafile /usr/local/etc/mosquitto/tls/ca.crt
3、修改certfile参数
编辑/etc/mosquitto/mosquitto.conf文件，在上面添加的cafile参数下方添加
certfile /usr/local/etc/mosquitto/tls/server.crt
4、修改keyfile参数
编辑/etc/mosquitto/mosquitto.conf文件，在上面添加的certfile参数下方添加
keyfile /usr/local/etc/mosquitto/tls/server.key
5、修改require_certificate参数
编辑/etc/mosquitto/mosquitto.conf文件，找到require_certificate参数
修改前：#require_certificate false
修改后：require_certificate true
6、修改use_identity_as_username参数
编辑/etc/mosquitto/mosquitto.conf文件，找到use_identity_as_username参数
修改前：#use_identity_as_username false
修改后：use_identity_as_username false
5、加载证书进行订阅、发布验证
5.1、服务端使用的IP或域名
mqtt broker运行的服务端最好使用域名，如果没有域名，IP要对应好，因为生成的证书中的域名如果跟实际访问不匹配，会认证失败，虽然添加–insecure参数可以忽略；
这里实验环境使用的是192.168.100.200
5.2、通过tls证书订阅
mosquitto_sub -h 192.168.100.200 -p 2883 -t ‘/mqttbroker/test’ -u ‘test-mqtt-passwd1’ -P ‘123456’ -i 123456 –cafile /etc/mosquitto/tls/ca.crt –cert /etc/mosquitto/tls/client.crt –key /etc/mosquitto/tls/client.key
5.3、通过tls证书发布
mosquitto_pub -h 192.168.100.200 -p 2883 -t ‘/mqttbroker/test’ -u ‘test-mqtt-passwd1’ -P ‘123456’ -i 123457 –cafile /etc/mosquitto/tls/ca.crt –cert /etc/mosquitto/tls/client.crt –key /etc/mosquitto/tls/client.key -m ‘hello mqtt passwd tls’
订阅方可以正常访问，则说明配置都正常了，done；