基于 Dropbear & Zlib 搭建轻量级的ssh server

【目的】

移植dropbear & zlib 在AM335X开发板上搭建轻量级的ssh server

【环境】

1、  Ubuntu 16.04发行版

2、  MC183平台

3、  交叉编译器arm-linux-gnueabihf-gcc-4.7.3

【步骤】

1、下载zlib-1.2.8.tar.gz dropbear-2015.67.tar.bz2源码。

2.  交叉编译zlib。

解压zlib-1.2.8.tar.gz

tar zvxf  zlib-1.2.8.tar.gz

cd zlib-1.2.8

配置：

./configure  --prefix=../../zlib/install

修该Makefile用于交叉编译，如下加粗字体为改动部分：

change Makefile

 

CROSS=arm-linux-gnueabihf-

CC=$(CROSS)gcc

 

CFLAGS=-O3  -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN

#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7

#CFLAGS=-g -DDEBUG

#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion

#           -Wstrict-prototypes -Wmissing-prototypes

 

SFLAGS=-O3  -fPIC -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN

LDFLAGS=

TEST_LDFLAGS=-L. libz.a

LDSHARED=$(CC) -shared -Wl,-soname,libz.so.1,--version-script,zlib.map

CPP=$(CC) -E

 

STATICLIB=libz.a

SHAREDLIB=libz.so

SHAREDLIBV=libz.so.1.2.8

SHAREDLIBM=libz.so.1

LIBS=$(STATICLIB) $(SHAREDLIBV)

 

AR=$(CROSS)ar

ARFLAGS=rc

RANLIB=$(CROSS)ranlib

LDCONFIG=ldconfig

LDSHAREDLIBC=-lc

TAR=tar

SHELL=/bin/sh

EXE=

 

#prefix =/usr/local

prefix=../../zlib/install

 

编译：

make

安装到prefix目录当中：

make install

 

用tree 显示安装目录如下所示：

install

├── include

│   ├── zconf.h

│   └── zlib.h

├── lib

│   ├── libz.a

│   ├── libz.so -> libz.so.1.2.8

│   ├── libz.so.1 -> libz.so.1.2.8

│   ├── libz.so.1.2.8

│   └── pkgconfig

│       └── zlib.pc

└── share

    └── man

        └── man3

            └── zlib.3

3.  交叉编译dropbear。

解压dropbear-2015.67.tar.bz2

tar jvxf  dropbear-2015.67.tar.bz2

cd dropbear-2015.67

配置：

./configure --prefix=../../dropbear/install --with-zlib=../../zlib/install/ CC=arm-linux-gnueabihf-gcc --host=arm-linux

会报如下错误：

configure: error: expected an absolute directory name for --prefix: ../../dropbear/install

因为—prefix需要一个绝对的路径，所以修该成如下进行配置

./configure --prefix=/home/vmuser/sdc/remote_svn/iotx-am335x/MC-183/package/dropbear/install --with-zlib=../../zlib/install/ CC=arm-linux-gnueabihf-gcc --host=arm-linux

默认编译安装：

default compile:

make

make install

 

自定义编译安装：

counster compile:

make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"

make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install

 

用tree 显示安装目录如下所示：

install/

├── bin

│   ├── dbclient

│   ├── dropbearconvert

│   ├── dropbearkey

│   └── scp

├── sbin

│   └── dropbear

└── share

    └── man

        ├── man1

        │   ├── dbclient.1

        │   ├── dropbearconvert.1

        │   └── dropbearkey.1

        └── man8

            └── dropbear.8

4.  测试：

# download dbclient

wget http://192.168.3.88/dropbear/install/bin/dbclient -O  /bin/dbclient   &&  chmod  +x  /bin/dbclient

# download scp

wget http://192.168.3.88/dropbear/install/bin/scp -O  /bin/scp   &&  chmod  +x  /bin/scp

# download dropbearkey

wget http://192.168.3.88/dropbear/install/bin/dropbearkey -O  /bin/dropbearkey   &&  chmod  +x  /bin/dropbearkey

# download dropbearconvert

wget http://192.168.3.88/dropbear/install/bin/dropbearconvert -O  /bin/dropbearconvert   &&  chmod  +x  /bin/dropbearconvert

# download dropbear

wget http://192.168.3.88/dropbear/install/sbin/dropbear -O  /bin/dropbear   &&  chmod  +x  /bin/dropbear

# download libz so

wget http://192.168.3.88/zlib/install/lib/libz.so.1.2.8 -O  /lib/libz.so.1.2.8 && chmod +x /lib/libz.so.1.2.8

# create soft ln

ln -s /lib/libz.so.1.2.8 /lib/libz.so

ln -s /lib/libz.so.1.2.8 /lib/libz.so.1

# mkdir /etc/dropbear

mkdir -p /etc/dropbear

cd  /etc/dropbear

# generate dropbear_dss_host_key

root@am335x:/etc/dropbear# dropbearkey -t dss -f dropbear_dss_host_key

Generating key, this may take a while...

Public key portion is:

ssh-dss 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@am335x Fingerprint: md5 09:e2:6c:93:39:d0:08:1e:97:64:74:c8:d6:78:97:6e

# generate dropbear_rsa_host_key

root@am335x:/etc/dropbear# dropbearkey -t rsa -f dropbear_rsa_host_key

Generating key, this may take a while...

Public key portion is:

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC5txR31wx+AXiy4nOanuocphD7VYTQa5L1yLmANQVZnZh2itRnuMrsAfSBOkKIOo2UwcK9iyJCWXFmcoLe6acXIeX/mAP4OzgOqi1gLJoBw/y3vmeIzJJP1Qn96iVhZqL1NLjqj863+LNi20WuvYzdKbd13dbTGnE7auDynKLlE+LudSg2MjDLhJ7VZ4tGagoxY4HkRfGgKha2+K7CeCvby29St5QOt8HWjbOBM6MaNqX09GH7W1hpzti39xpZwz8YakPWMgYd6/elBFtVx0tZhg/80xq1HHG5OtDM6Fzo+wtZODb5r2gEBvYPJ+DaX06x9f6WOaWXtKnV5IEu3GF/ root@am335x

Fingerprint: md5 09:0c:bc:c0:c9:85:26:c1:aa:00:4a:0f:7e:23:33:1d

# restart dropbear

killall  -9 dropbear

dropbear -p  22 &