dropbrear not compiling statically

Tilman Glotzner tilmanglotzner at hotmail.com
Sun Oct 16 21:50:59 WST 2011


Hello
 
 
I am trying to compile dropbrear statically:
 
1)  configure
LDFLAGS="-L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/lib/"  ./configure --prefix=/opt/nfs/vmic7750/usr  --with-zlib=/opt/nfs/vmic7750/usr/lib/
 
2)  STATIC=1 LDFLAGS="-L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/lib/"   make PROGRAMS="dropbear dropbearkey scp"
This results in an error: 
 
gcc -L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/lib/ -static -o dropbear dbutil.o buffer.o dss.o bignum.o signkey.o rsa.o random.o queue.o atomicio.o compat.o  fake-rfc2553.o  common-session.o packet.o common-algo.o common-kex.o common-channel.o common-chansession.o termcodes.o loginrec.o tcp-accept.o listener.o process-packet.o common-runopts.o circbuffer.o -lcrypt svr-kex.o svr-algo.o svr-auth.o sshpty.o svr-authpasswd.o svr-authpubkey.o svr-authpubkeyoptions.o svr-session.o svr-service.o svr-chansession.o svr-runopts.o svr-agentfwd.o svr-main.o svr-x11fwd.o svr-tcpfwd.o svr-authpam.o  libtomcrypt/libtomcrypt.a libtommath/libtommath.a -lutil -lz
svr-chansession.o: In function `execchild':
svr-chansession.c:(.text+0x4b8): warning: Using 'initgroups' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
sshpty.o: In function `pty_setowner':
sshpty.c:(.text+0x18): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
common-session.o: In function `fill_passwd':
common-session.c:(.text+0x9f): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
dbutil.o: In function `connect_remote':
dbutil.c:(.text+0x96f): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
svr-authpasswd.o: In function `svr_auth_password':
svr-authpasswd.c:(.text+0x16): warning: Using 'getspnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
svr-authpasswd.c:(.text+0x70): undefined reference to `crypt'
collect2: ld returned 1 exit status
make: *** [dropbear] Error 1
 
 
3) Next attempt: add LIBS="-lcrypt"
STATIC=1 LDFLAGS="-L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/lib/" LIBS="-lcrypt"  make PROGRAMS="dropbear dropbearkey scp"
 
This links with a couple of warnings: Most noticable one:

gcc -L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/usr/lib/ -L/opt/nfs/vmic7750/lib/ -static -o scp scp.o progressmeter.o atomicio.o scpmisc.o compat.o
scp.o: In function `main':
scp.c:(.text+0x2092): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
 
4) dropbearkey is not portable 
dropbearkey -t rsa -f /opt/nfs/vmic7750/etc/dropbear/dropbear_rsa_host_key works on the machine on which I compiled it.
 
On another machine, it however does not start. Error message is this: 
dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key
dropbearkey: /lib/libc.so.6: version `GLIBC_2.7' not found (required by dropbear)
 
I guess this is related to different libc's, i.e. the machine that compiled dropbear probably uses an newer version than the one executing it. Unfortunatelly, I do not get libc compiled. And I also wonder a bit, because I hoped to avoid mismatches like this by statically linking. 
 
5) I created dropbear_[rsa|dss]_host_key  on the build machine, and copied to the machine on which I want to run dropbear. /usr/sbin/dropbear starts up fine. A root login is refused however:
 
ssh root at 192.168.1.40
....
The authenticity of host '192.168.1.40 (192.168.1.40)' can't be established.
....
Warning: Permanently added '192.168.1.40' (RSA) to the list of known hosts.
root at 192.168.1.40's password:
Permission denied, please try again.
...
 
Apparantly, dropbear does not know user root -- I wonder why however (root is defined in /etc/passwd) :
 
Oct 16 17:01:30 192.168.1.40 dropbear[867]: Child connection from 192.168.1.59:44549
Oct 16 17:01:31 192.168.1.40 dropbear[867]: Login attempt for nonexistent user from 192.168.1.59:44549
Oct 16 17:01:32 192.168.1.40 dropbear[867]: Login attempt for nonexistent user from 192.168.1.59:44549
Oct 16 17:01:33 192.168.1.40 dropbear[867]: Login attempt for nonexistent user from 192.168.1.59:44549
Oct 16 17:01:34 192.168.1.40 dropbear[867]: Login attempt for nonexistent user from 192.168.1.59:44549
Oct 16 17:01:35 192.168.1.40 dropbear[867]: Exit before auth: Error writing

Help is certainly apprecitated .-)
 
Thanks
 
Tilman
 
Thanks
 
Tilman

 
 
 
  		 	   		  
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