[Guide] Compiling dropbear 2015.67

[MonaLisaOverdrive]

I have tried to compile dropbear with both patches. But everytime it shows ::

I'm late to this question, but you need to build dropbear from sources or could you use a prebuilt version?

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[serasihay]

netbsd_getpass.c:68:18: error: '_PASSWORD_LEN' undeclared (first use in this function)

I guess you're not using the gcc included in the Android NDK... :-?

'_PASSWORD_LEN' is defined in pwd.h; this header is provided with the Android NDK.

---------- Post added at 11:25 PM ---------- Previous post was at 11:19 PM ----------

I'm late to this question, but you need to build dropbear from sources or could you use a prebuilt version?

From source.

 

[fecaleagle]

Hey @wolfdude and @serasihay,

Thanks so much for putting this guide (and especially the patches) together. I used @wolfdude's patch and cross-compiled the correct version of DropBear for an Amazon Fire TV (2nd generation). I installed it and was able to produce and use the rsa and dss host keys, and the server appears to start without issue.

I am starting the server for testing purposes using the following command:

dropbear -A -N root -U 0 -G 0 -C password -d /sdcard/DropBear/dropbear_dss_host_key -r /sdcard/DropBear/dropbear_rsa_host_key -F -E

Everything seems to start correctly, but when I connect from my iPhone (Prompt 2), the stdout immediately replies:

[22370] Jan 04 10:17:35 Child connection from 192.168.1.158:58458
void endusershell()(3) is not implemented on Android
void endusershell()(3) is not implemented on Android
[22370] Jan 04 10:17:36 password auth succeeded for 'root' from 192.168.1.158:58458
[22370] Jan 04 10:17:37 Exit (root): Disconnect received

When I connect from Windows (Putty), I receive:

[22414] Jan 04 10:20:51 Child connection from 192.168.1.156:2776
void endusershell()(3) is not implemented on Android
void endusershell()(3) is not implemented on Android
[22414] Jan 04 10:21:09 password auth succeeded for 'root' from 192.168.1.156:2776
[22414] Jan 04 10:21:09 Exit (root): Exited normally

I have not attempted to re-compile using @serasihay's patch, but I am wondering if you guys have a hunch as to what's going awry here. I initially tried using public-key authentication, and I receive the same message and disconnect.

Thanks,
William

Edit: Okay, when I attempt to connect from OpenWrt, which I believe uses a DropBear client, the server doesn't return anything different, but the client reports:

CANNOT LINK EXECUTABLE DEPENDENCIES: "libc.so" is 32-bit instead of 64-bit

I will look into it, but I assume this is a cross-compilation mistake, so maybe you guys can help me along.

Edit 2: Yes, according to this post, http://xdaforums.com/fire-tv/general/root-firetv2-ssh-unable-to-connect-t3259530, I must have built it using the wrong toolchain. Thanks to everybody on this forum for humoring me. It's taken me quite a bit of time to get my bearings dealing with Android.

Edit 3: So, I rebuilt using what seems to be the correct toolchain. The file command reports:

./dropbearmulti: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, stripped

Clients still receive CANNOT LINK EXECUTABLE DEPENDENCIES: "libc.so" is 32-bit instead of 64-bit.

I've posted my toolchain setup at, http://xdaforums.com/fire-tv/help/requesting-help-make-standalone-t3285824/post64641693#post64641693, if anybody would care to review it.

 

[Geofferey]

If you are trying to compile this for 64bit android you will also need to modify

svr-chansession.c

in order to successfully login


& change

addnewvar("LD_LIBRARY_PATH", "/system/[COLOR="Red"]lib[/COLOR]");

to:

addnewvar("LD_LIBRARY_PATH", "/system/[COLOR="Lime"]lib64[/COLOR]");

or just comment out the line, which is probably better

 [COLOR="lime"]/*[/COLOR] addnewvar("LD_LIBRARY_PATH", "/system/lib64"); [COLOR="Lime"]*/[/COLOR]

I spent the whole day looking for this very simple fix lol.

EDIT:
I'm still having issues with the password implementation. I can login with dropbear or openssh terminal clients, but other apps that use a graphical interface such as putty, winscp, filezilla, etc all fail to login with password.