Android 搭建ssh服务
搭建步骤：
1. 下载dropbear源码
- 下载源码有几个选择：
- 到dropbear官网下载源码。不过这里的源码是没有Android.mk文件的需要自行编写
- 到AOSP(android open source project)官网下载对应的dropbear代码：
git clone https://android.googlesource.com/platform/external/dropbear - 到这个地址下载，地址：https://pan.baidu.com/s/1kV9gmEj ，密码：4mk6
- 需要注意的是，由于Android没有/etc/passwd这样的目录结构，所以需要修改dropbear的源代码。
//修改dropbear根目录下的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. 将下载好的dropbear源代码解压放到Android源码的external文件夹下。
3. 编译dropbear
- 在Android源代码根目录下执行：
再输入：. build/envsetup.sh //点后面有空格
然后跟着提示走：choosecombo
最后输入：Build type choices are: 1. release 2. debug Which would you like? [1] 1 Which product would you like? [generic] rk322x_box(输入自己的产品名) Variant choices are: 1. user 2. userdebug 3. eng Which would you like? [eng] 1
在经过一段时间后，编译好的文件就会在out/target/product/rk322x_box(自己的产品名)/system/xbin中找到：mmm external/dropbeardropbear dropbearkey ssh scp (从第三种方法下载到的源码才会有这个) sftp-server - 这里需要解释一下输入的命令：
- . build/envsetup.sh
作用是初始化编译环境，并引入一些辅助的 Shell 函数，如launch、mm、mmm等 - choosecombo
用于设置编译参数，如选择编译类型(debug、release)，编译产品类型等 - mmm
构建指定目录下的源码
- . build/envsetup.sh
4. 加入到Android系统中
- 重新挂载system目录
或者adb root adb remountadb shell xxx: $ su xxx: # mount -o remount,rw /system - 创建相关文件夹
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 - 将dropbear的代码文件加入到系统中
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 - 赋予权限
xxx:/# chmod 755 /system/xbin/dropbear*
5. 运行dropbear
- 创建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 - 启动dropbear
- 以密码登录
dropbear -E -F -v- 以密钥登录
dropbear -E -F -v -s //-s 指定禁止密码登录 - dropbear 命令参考：
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)
