Python Paho mqtt客户端存在服务器端证书问题

我的python无法连接到用java编写的代理。代理已启用与jks类型证书的SSL连接。代理超出我的管理范围

我将jks证书转换为pem证书，以便在python代码中使用。但当我运行代码时，出现了一个错误：

Traceback (most recent call last):
  File "test.py", line 55, in <module>
    client.connect("192.168.110.2", 56785, 60)
  File "C:\Python\Python37\lib\site-packages\paho\mqtt\client.py", line 760, in
connect
    return self.reconnect()
  File "C:\Python\Python37\lib\site-packages\paho\mqtt\client.py", line 919, in
reconnect
    sock.do_handshake()
  File "C:\Python\Python37\lib\ssl.py", line 1117, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: CA signature digest algorithm too weak (_ssl.c:1056)

这是我的全部代码：

# -*- coding:utf-8 -*-

import json
import ssl
import time

import paho.mqtt.client as mqtt

# constants
token = 'token '
mqtt_username = 'name'
mqtt_passwd = 'pass'

test_payload = {"type": "a_type","data": "my data","tokens": [token]}


def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    if rc == 0:
        # subscribe
        client.subscribe("Client/%s/Biz/Down" % token, 1)
        time.sleep(3)
        client.publish('Client/%s/Biz/Up' % token,
                       json.dumps(test_payload))
    # time.sleep(5)
    else:
        client.disconnect()


def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))
    if ("Client/%s/Biz/Down" % token) == msg.topic:
        client.disconnect()


client = mqtt.Client('', True, None, mqtt.MQTTv31)
client.username_pw_set(mqtt_username, mqtt_passwd)
client.on_connect = on_connect
client.on_message = on_message
client.tls_set('./server.pem')

client.connect("192.168.110.2", 56785, 60)

client.loop_forever()

---

我已经弄明白了。在客户端，您不需要配置服务器的自签名证书。现在它工作了

# -*- coding:utf-8 -*-

import json
import ssl
import time

import paho.mqtt.client as mqtt

# constants
token = 'token '
mqtt_username = 'name'
mqtt_passwd = 'pass'

test_payload = {"type": "a_type","data": "my data","tokens": [token]}


def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    if rc == 0:
        # subscribe
        client.subscribe("Client/%s/Biz/Down" % token, 1)
        time.sleep(3)
        client.publish('Client/%s/Biz/Up' % token,
                       json.dumps(test_payload))
    # time.sleep(5)
    else:
        client.disconnect()


def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))
    if ("Client/%s/Biz/Down" % token) == msg.topic:
        client.disconnect()


client = mqtt.Client('', True, None, mqtt.MQTTv31)
client.username_pw_set(mqtt_username, mqtt_passwd)
client.on_connect = on_connect
client.on_message = on_message

# the key steps here
context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
# if you do not want to check the cert hostname, skip it
# context.check_hostname = False
client.tls_set_context(context)

client.connect("192.168.110.2", 56785, 60)

client.loop_forever()

---

非常感谢。你救了我！

# -*- coding:utf-8 -*-

import json
import ssl
import time

import paho.mqtt.client as mqtt

# constants
token = 'token '
mqtt_username = 'name'
mqtt_passwd = 'pass'

test_payload = {"type": "a_type","data": "my data","tokens": [token]}


def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    if rc == 0:
        # subscribe
        client.subscribe("Client/%s/Biz/Down" % token, 1)
        time.sleep(3)
        client.publish('Client/%s/Biz/Up' % token,
                       json.dumps(test_payload))
    # time.sleep(5)
    else:
        client.disconnect()


def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))
    if ("Client/%s/Biz/Down" % token) == msg.topic:
        client.disconnect()


client = mqtt.Client('', True, None, mqtt.MQTTv31)
client.username_pw_set(mqtt_username, mqtt_passwd)
client.on_connect = on_connect
client.on_message = on_message

# the key steps here
context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
# if you do not want to check the cert hostname, skip it
# context.check_hostname = False
client.tls_set_context(context)

client.connect("192.168.110.2", 56785, 60)

client.loop_forever()