[原创] 浅浅记录下学习Protobuf历程，最终实现App与本地Python服务器交互-Android安全-看雪-安全社区|安全招聘|kanxue.com

[原创] 浅浅记录下学习Protobuf历程，最终实现App与本地Python服务器交互

发表于: 2023-8-2 19:50 12318

[原创] 浅浅记录下学习Protobuf历程，最终实现App与本地Python服务器交互

哇哈哈919

2023-8-2 19:50

12318

第一次写文章,难免会有差错,文章若有不妥之处,还请大家不吝赐教~

希望这篇文章对你有帮助,可以减轻入门protobuf的一些负担~

目标:

创建 example.proto 文件来编写对应规则,创建了一个服务以及两个数据格式

利用 example.proto 通过 grpcio_tools protoc 来生成Python 客户端和服务端(grpc-server)文件为踩坑记录

根据生成的example_pb2_grpc.py编写 service.py

根据生成的example_pb2.py 编写client.py

先运行service.py 再运行 client.py 效果图如下

至此,完成了第一个小任务,最后查阅资料时,发现官方提供了Demo 以及教程....

官方语法介绍

目标：

在6P手机上配置好Python环境,grpc环境

运行client.py 与 PC上server.py进行交互

~~(未复现出)抓包拦截请求数据,尝试分析.... ~~ 当初以为只要运行在手机上就算是android了,,,后来才反应过来,,,,我是运行在linux上py程序不是android

将服务端的监听端口由127.0.0.1 修改为 0.0.0.0,之后先启动server 再在6P手机上启动client.Py 实现交互

客户端启动失败！ charles 抓的包为 Unknow 整体运行逻辑如下~

demo下载地址

目标：

只分析其中一个界面

进入对应解释器环境下执行 python -m grpc_tools.protoc -I./ --python_out=./ --grpc_python_out=./ helloworld.proto

照猫画虎写出对应的service.py

验证启动apk 能否正常通信

所有所有前期准备已经ok 准备使用hook抓包看能否抓到包~

所有的输出信息如下

hook com.google.protobuf.Utf8.encode(java.lang.CharSequence, [B, int, int)

至此全部完结~
以上就是最近几天学习内容,接下来研究研究Java具体如何实现的，争取学会还原tag来实现无proto文件反解析出数据.

syntax = "proto3";
 
package test;
 
service HelloDemo {

    rpc Hello(HelloReq) returns(HelloReply){}
}
 
message HelloReq{

    string name = 1;

    int32 age = 2;

    string sendtime = 3;
}
 
message HelloReply{

    string result = 1;
}

syntax = "proto3";

package test;

service HelloDemo {

rpc Hello(HelloReq) returns(HelloReply){}

}

message HelloReq{

string name = 1;

int32 age = 2;

string sendtime = 3;

}

message HelloReply{

string result = 1;

}

# coding:utf-8
 
import grpc

import example_pb2 as pb2

import example_pb2_grpc as pb2_grpc

from concurrent import futures    # 目的为了给服务器增加线程
 
# HelloDemo 为 .proto 文件中 service 

class HelloDemo(pb2_grpc.HelloDemoServicer):

    # Hello 为  .proto 文件中 service 包含 rpc 方法名 

    def Hello(self, request, context):

        name, age, sendtime = request.name, request.age, sendtime

        result = f"My Name is {name},age is {age} years old!\n now time is {sendtime}"

        # 返回数据类型为.proto 文件中 message   HelloReply 

        return pb2.HelloReply(result=result)
 
def run():

    grpc_server = grpc.server(

        futures.ThreadPoolExecutor(max_workers=4),

    )

    pb2_grpc.add_HelloDemoServicer_to_server(HelloDemo(),grpc_server)

    # PC 上 监听 127.0.0.1 局域网连接 监听 0.0.0.0

    ip_port = "127.0.0.1:5505"

    grpc_server.add_insecure_port(ip_port)

    grpc_server.start()

    print(f"service start at {ip_port}")

    grpc_server.wait_for_termination()
 
if __name__ == "__main__":

    run()

# coding:utf-8

import grpc

import example_pb2 as pb2

import example_pb2_grpc as pb2_grpc

from concurrent import futures # 目的为了给服务器增加线程

# HelloDemo 为 .proto 文件中 service

class HelloDemo(pb2_grpc.HelloDemoServicer):

# Hello 为 .proto 文件中 service 包含 rpc 方法名

def Hello(self, request, context):

name, age, sendtime = request.name, request.age, sendtime

result = f"My Name is {name},age is {age} years old!\n now time is {sendtime}"

# 返回数据类型为.proto 文件中 message HelloReply

return pb2.HelloReply(result=result)

def run():

grpc_server = grpc.server(

futures.ThreadPoolExecutor(max_workers=4),

)

pb2_grpc.add_HelloDemoServicer_to_server(HelloDemo(),grpc_server)

# PC 上监听 127.0.0.1 局域网连接监听 0.0.0.0

ip_port = "127.0.0.1:5505"

grpc_server.add_insecure_port(ip_port)

grpc_server.start()

print(f"service start at {ip_port}")

grpc_server.wait_for_termination()

if __name__ == "__main__":

run()

# coding:utf-8
 
import grpc

import example_pb2 as pb2

import example_pb2_grpc as pb2_grpc

from concurrent import futures
 
def run():

    # 构建通道与服务器连接

    conn = grpc.insecure_channel("127.0.0.1:5505")

    # HelloDemoStub表示客户端  ,HelloDemoStub是 protoc 自动生成的

    client = pb2_grpc.HelloDemoStub(channel=conn)

    name, age, sendtime = "xiaozhu0513", 18, datetime.now().strftime('%Y-%m-%d-%H:%M:%S')

    # 相当于先生成一个 HelloReq 类型的数据  为 本地发送到客户端的数据, 然后传输  实例化客户端的

    response = client.Hello(pb2.HelloReq(

        name = name,

        age = age,

        sendtime = f"{sendtime}"

    ))

    print(f"客户端发送 {name} {age} {sendtime} -> 服务器")

    print("客户端接收到服务器返回信息 ",response.result)
 
if __name__ == "__main__":

    run()

# coding:utf-8

import grpc

import example_pb2 as pb2

import example_pb2_grpc as pb2_grpc

from concurrent import futures

def run():

# 构建通道与服务器连接

conn = grpc.insecure_channel("127.0.0.1:5505")

# HelloDemoStub表示客户端 ,HelloDemoStub是 protoc 自动生成的

client = pb2_grpc.HelloDemoStub(channel=conn)

name, age, sendtime = "xiaozhu0513", 18, datetime.now().strftime('%Y-%m-%d-%H:%M:%S')

# 相当于先生成一个 HelloReq 类型的数据  为 本地发送到客户端的数据, 然后传输  实例化客户端的

response = client.Hello(pb2.HelloReq(

name = name,

age = age,

sendtime = f"{sendtime}"

))

print(f"客户端发送 {name} {age} {sendtime} -> 服务器")

print("客户端接收到服务器返回信息 ",response.result)

if __name__ == "__main__":

run()

from datetime import datetime
 
import grpc

import helloworld_pb2 as pb2

import helloworld_pb2_grpc as pb2_grpc

from concurrent import futures
 
class Greeter(pb2_grpc.GreeterServicer):

    def SayHello(self, request, context):

        name = request.name

        sendtime = datetime.now().strftime('%Y-%m-%d-%H:%M:%S')

        result = f"My Name is {name}!!! send time is {sendtime} "

        print(f"服务器接收到客户端参数 -> name = {name}")

        print(f"服务器响应时间: {sendtime}")

        return pb2.HelloReply(message = result)
 
def run():

    grpc_server = grpc.server(

        futures.ThreadPoolExecutor(max_workers=4),

    )

    pb2_grpc.add_GreeterServicer_to_server(Greeter(),grpc_server)

    # ip_port = "127.0.0.1:50051"

    ip_port = "0.0.0.0:50051"

    grpc_server.add_insecure_port(ip_port)

    grpc_server.start()

    print(f"service start at {ip_port}")

    grpc_server.wait_for_termination()
 
if __name__ == "__main__":

    run()

from datetime import datetime

import grpc

import helloworld_pb2 as pb2

import helloworld_pb2_grpc as pb2_grpc

from concurrent import futures

class Greeter(pb2_grpc.GreeterServicer):

def SayHello(self, request, context):

name = request.name

sendtime = datetime.now().strftime('%Y-%m-%d-%H:%M:%S')

result = f"My Name is {name}!!! send time is {sendtime} "

print(f"服务器接收到客户端参数 -> name = {name}")

print(f"服务器响应时间: {sendtime}")

return pb2.HelloReply(message = result)

def run():

grpc_server = grpc.server(

futures.ThreadPoolExecutor(max_workers=4),

)

pb2_grpc.add_GreeterServicer_to_server(Greeter(),grpc_server)

# ip_port = "127.0.0.1:50051"

ip_port = "0.0.0.0:50051"

grpc_server.add_insecure_port(ip_port)

grpc_server.start()

print(f"service start at {ip_port}")

grpc_server.wait_for_termination()

if __name__ == "__main__":

run()

# 读取文件并处理

with open('my_protobuf.txt', 'r',encoding='utf-8') as file:

    lines = file.readlines()

    processed_lines = []

    for line in lines:

        # 进行处理操作

        processed_line = "android hooking watch class " + line

        # 将处理后的行插入到原来的列表中

        processed_lines.append(processed_line)
 
# 将处理后的内容按行插入到原文件中

with open('my_protobuf_new.txt', 'w',encoding='utf-8') as file:

    for processed_line in processed_lines:

        file.write(processed_line)

# 读取文件并处理

with open('my_protobuf.txt', 'r',encoding='utf-8') as file:

lines = file.readlines()

processed_lines = []

for line in lines:

# 进行处理操作

processed_line = "android hooking watch class " + line

# 将处理后的行插入到原来的列表中

processed_lines.append(processed_line)

# 将处理后的内容按行插入到原文件中

with open('my_protobuf_new.txt', 'w',encoding='utf-8') as file:

for processed_line in processed_lines:

file.write(processed_line)

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(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeStringSize(int, java.lang.String)

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeTagSize(int)

(agent) [75uwxvix9zw] 【【【Called com.google.protobuf.WireFormat.makeTag(int, int)】】】

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeUInt32SizeNoTag(int)

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeStringSizeNoTag(java.lang.String)

(agent) [78m3ko66u48] Called com.google.protobuf.Utf8.encodedLength(java.lang.CharSequence)

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeLengthDelimitedFieldSize(int)

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computeUInt32SizeNoTag(int)

(agent) [t74uyknf3ri] Called io.grpc.protobuf.lite.ProtoInputStream.drainTo(java.io.OutputStream)

(agent) [pi8dc23shb] 【【【Called com.google.protobuf.AbstractMessageLite.writeTo(java.io.OutputStream)】】】

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.computePreferredBufferSize(int)

(agent) [4gz3lfvhznc] Called com.google.protobuf.CodedOutputStream.newInstance(java.io.OutputStream, int)

(agent) [2ira22725rq] Called com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeString(int

, java.lang.String)

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最后于 2023-8-30 16:18 被哇哈哈919编辑，原因：有错别字~

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2023-11-23 11:44

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2023-11-21 15:42

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哇哈哈919 雪币： 2933 活跃值： (1727) 能力值： ( LV3，RANK：20 ) 在线值：发帖 8 回帖 14 粉丝 2 关注私信	哇哈哈919 3 楼铭濠笙科技能给我解密一下吗？协议protobuf 是违法app的话我可以试着学习一下如何解密,若是正规app就算了。目的是学习~ 2023-8-3 14:21 0
小海CC 雪币： 130 活跃值： (145) 能力值： ( LV2，RANK：10 ) 在线值：发帖 0 回帖 7 粉丝 1 关注私信	小海CC 5 楼标题protobuf拼错了 2023-8-30 09:42 0
哇哈哈919 雪币： 2933 活跃值： (1727) 能力值： ( LV3，RANK：20 ) 在线值：发帖 8 回帖 14 粉丝 2 关注私信	哇哈哈919 6 楼小海CC 标题protobuf拼错了谢谢老哥提醒！ 2023-8-30 16:39 0
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最新回复 (5)
哇哈哈919 雪币： 2933 活跃值： (1727) 能力值： ( LV3，RANK：20 ) 在线值：发帖 8 回帖 14 粉丝 2 关注私信	哇哈哈919 3 楼铭濠笙科技能给我解密一下吗？协议protobuf 是违法app的话我可以试着学习一下如何解密,若是正规app就算了。目的是学习~ 2023-8-3 14:21 0
小海CC 雪币： 130 活跃值： (145) 能力值： ( LV2，RANK：10 ) 在线值：发帖 0 回帖 7 粉丝 1 关注私信	小海CC 5 楼标题protobuf拼错了 2023-8-30 09:42 0
哇哈哈919 雪币： 2933 活跃值： (1727) 能力值： ( LV3，RANK：20 ) 在线值：发帖 8 回帖 14 粉丝 2 关注私信	哇哈哈919 6 楼小海CC 标题protobuf拼错了谢谢老哥提醒！ 2023-8-30 16:39 0
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