Android Wi-Fi EAP-SIM代码解析

最新推荐文章于 2025-06-27 14:54:13 发布

最新推荐文章于 2025-06-27 14:54:13 发布 · 1.5k 阅读

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本文详细介绍了在EAP-SIM认证过程中wpa_supplicant的工作流程，包括发送APDU-Command:"SELECT"到ApduService进行SIM卡文件系统中的文件选择，并解释了正确的APDU-Response及其含义。同时，文章还概述了ApduService如何通过Unix套接字监听并处理来自wpa_supplicant的请求。

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1. wpa_supplicant

During the process of EAP-SIM Authentication, wpa_supplicant will send APDU-Command:"SELECT" to ApduService.

The "SELECT" Command means to select one file from the file system of SIM Card
The right APDU-Response is 0x61, or 0x6c, or 0x9f, which means the APDU-Command executed successfully;
The wrong APDU-Response is 0x6a82, which means "Selected file not found", according to the protocol: ETSI GSM 11.11

    scard_get_imsi()
         |-->scard_select_file()
               |-->_scard_select_file()
                    |-->scard_transmit()
                         |-->SCardTransmit()
                              |-->(1)socket_local_client()-->open socket and connect
                              |      |-->socket()
                              |      |-->socket_local_client_connect()
                              |           |-->connect()
                              |-->(2)send()
                              |-->(3)select()
                              |-->(4)recv()

2. ApduService

The ApduService is responsible for setting up a Unix socket when Wifi starts and listening for incoming connections.
Data read from the socket will be parsed and transmitted as a APDU Command to Telephony.
The response will be sent back over the socket. The socket's name is sent to the wpa supplicant.

frameworks/opt/net/wifi/service/java/com/android/server/wifi/ApduService.java 
 
 
    runService()
     |-->(1)waitForConnection()
     |        |-->ServerSocket.accept()
     |-->(2)communicationWithClient()
              |-->ConnectionSocket.getInputStream()
              |-->ConnectionSocket.getOutputStream()
              |-->phone.iccTransmitApduBasicChannel()

3. PhoneInterfaceManager

/packages/services/Telephony/src/com/android/phone/PhoneInterfaceManager.java

(1) important events:
	EVENT_TRANSMIT_APDU_LOGIC_CHANNEL_DONE   
	EVENT_TRANSMIT_APDU_BASIC_CHANNEL_DONE   
(2) important commands:   
	CMD_TRANSMIT_APDU_LOGIC_CHANNEL   
	CMD_TRANSMIT_APDU_BASIC_CHANNEL   
(3) important methods:   
	iccTransmitApduLogicalChannel()   
	iccTransmitApduBasicChannel()   
(4) related System Property:   
	[gsm.sim.operator.numeric]