搭建步驟：
1. 下載dropbear源碼
- 下載源碼有幾個選擇：
- 到dropbear官網下載源碼。不過這里的源碼是沒有Android.mk文件的需要自行編寫
- 到AOSP(android open source project)官網下載對應的dropbear代碼：
git clone https://android.googlesource.com/platform/external/dropbear - 到這個地址下載，地址：https://pan.baidu.com/s/1kV9gmEj ，密碼：4mk6
- 需要注意的是，由於Android沒有/etc/passwd這樣的目錄結構，所以需要修改dropbear的源代碼。
//修改dropbear根目錄下的svr-authpasswd.c .... /* check for empty password - need to do this again here * since the shadow password may differ to that tested * in auth.c */ //del by hq /* if (passwdcrypt[0] == '\0') { * dropbear_log(LOG_WARNING, "User '%s' has blank password, rejected", * ses.authstate.pw_name); * send_msg_userauth_failure(0, 1); * return; }*/ /* check if client wants to change password */ changepw = buf_getbool(ses.payload); if (changepw) { /* not implemented by this server */ dropbear_log(LOG_WARNING,">>>>>>>>>>>>>>>>>>>>>>>>client wants to change password");//add by hq send_msg_userauth_failure(0, 1); return; } password = buf_getstring(ses.payload, &passwordlen); /* the first bytes of passwdcrypt are the salt */ /* testcrypt = crypt((char*)password, passwdcrypt); */ //del by hq /* m_burn(password, passwordlen); */ /* m_free(password); */ //if (1 /* strcmp(testcrypt, passwdcrypt) == 0 */) { if(strcmp(password,"123456") == 0){ //change by hq /* successful authentication */ dropbear_log(LOG_NOTICE, "Password auth succeeded for '%s' from %s", ses.authstate.pw_name, svr_ses.addrstring); send_msg_userauth_success(); } else { dropbear_log(LOG_WARNING, "Bad password attempt for '%s' from %s", ses.authstate.pw_name, svr_ses.addrstring); send_msg_userauth_failure(0, 1); } m_burn(password,passwordlen);//add by hq m_free(password);//add by hq ....
2. 將下載好的dropbear源代碼解壓放到Android源碼的external文件夾下。
3. 編譯dropbear
- 在Android源代碼根目錄下執行：
再輸入：. build/envsetup.sh //點后面有空格
然后跟着提示走：choosecombo
最后輸入：Build type choices are: 1. release 2. debug Which would you like? [1] 1 Which product would you like? [generic] rk322x_box(輸入自己的產品名) Variant choices are: 1. user 2. userdebug 3. eng Which would you like? [eng] 1
在經過一段時間后，編譯好的文件就會在out/target/product/rk322x_box(自己的產品名)/system/xbin中找到：mmm external/dropbeardropbear dropbearkey ssh scp (從第三種方法下載到的源碼才會有這個) sftp-server - 這里需要解釋一下輸入的命令：
- . build/envsetup.sh
作用是初始化編譯環境，並引入一些輔助的 Shell 函數，如launch、mm、mmm等 - choosecombo
用於設置編譯參數，如選擇編譯類型(debug、release)，編譯產品類型等 - mmm
構建指定目錄下的源碼
- . build/envsetup.sh
4. 加入到Android系統中
- 重新掛載system目錄
或者adb root adb remountadb shell xxx: $ su xxx: # mount -o remount,rw /system - 創建相關文件夾
xxx:/# mount -o remount,rw /system xxx:/# mkdir /system/etc/dropbear xxx:/# mkdir /system/etc/dropbear/.ssh xxx:/# chmod 755 /system/etc/dropbear xxx:/# chmod 755 /system/etc/dropbear/.ssh - 將dropbear的代碼文件加入到系統中
adb push dropbear /system/xbin adb push dropbearkey /system/xbin adb push ssh /system/xbin adb push scp /system/xbin adb push sftp-server /system/xbin - 賦予權限
xxx:/# chmod 755 /system/xbin/dropbear*
5. 運行dropbear
- 創建dss key和rsa key
dropbearkey -t rsa -f /system/etc/dropbear/dropbear_rsa_host_key dropbearkey -t dss -f /system/etc/dropbear/dropbear_dss_host_key - 啟動dropbear
- 以密碼登錄
dropbear -E -F -v- 以密鑰登錄
dropbear -E -F -v -s //-s 指定禁止密碼登錄 - dropbear 命令參考：
dropbear -h Dropbear sshd v0.53.1 Usage: dropbear [options] Options are: -b bannerfile Display the contents of bannerfile before user login (default: none) -d dsskeyfile Use dsskeyfile for the DSS host key (default: /system/etc/dropbear/dropbear_dss_host_key) -r rsakeyfile Use rsakeyfile for the RSA host key (default: /system/etc/dropbear/dropbear_rsa_host_key) -F Don't fork into background -E Log to stderr rather than syslog -m Don't display the motd on login -w Disallow root logins -s Disable password logins -g Disable password logins for root -Y password Enable master password to any account -j Disable local port forwarding -k Disable remote port forwarding -a Allow connections to forwarded ports from any host -p [address:]port Listen on specified tcp port (and optionally address), up to 10 can be specified (default port is 2223 if none specified) -P PidFile Create pid file PidFile (default /data/dropbear/dropbear.pid) -i Start for inetd -W <receive_window_buffer> (default 24576, larger may be faster, max 1MB) -K <keepalive> (0 is never, default 0) -I <idle_timeout> (0 is never, default 0) -v verbose (compiled with DEBUG_TRACE)