[Buildroot] OpenSSH login problem

[Michael Fischer <mf@go-sys.de>]

Hello Peter,

now I have checked the build with a new defconfig with my packages and it works.
The main difference to my old settings are the 5.4  Kernel and I set the "Fortify Source" check to 1.

I will check it with Fortify Source = 2.


Regards
  Michael.



> -----Urspr?ngliche Nachricht-----
> Von: Peter Seiderer [mailto:ps.report at gmx.net]
> Gesendet: Montag, 17. August 2020 23:33
> An: Michael Nosthoff via buildroot <buildroot@busybox.net>
> Cc: Michael Nosthoff <buildroot@heine.tech>; Michael Fischer <mf@go-
> sys.de>
> Betreff: Re: [Buildroot] OpenSSH login problem
> 
> Hello Michael (Fischer),
> 
> On Thu, 13 Aug 2020 17:54:31 +0200, Michael Nosthoff via buildroot
> <buildroot@busybox.net> wrote:
> 
> > Hi,
> >
> > I try to rephrase what you did to see if I understood it correctly:
> >
> > You built a Raspberry Pi BR Image based on commit
> > 01632805ab4be2bea4010ba1e46ab71f52d175a9
> > from the Buildroot git. OpenSSH works.
> > Then you did a git pull, did a "make clean && make" and with the resulting
> image you can't login via ssh.
> >
> > Is this correct?
> >
> > This assumed I tried the following:
> >
> > git log --oneline
> > 01632805ab4be2bea4010ba1e46ab71f52d175a9..origin/master
> > (origin/master is currently at
> > d1d89d37c02e3d8224fb6f812e87fef5612a771a)
> >
> > From the result I can tell that the OpenSSH package hasn't changed. So
> > it has to be some lib or something in the Filesystem.
> >
> > One commit that looks like it could be the troublemaker is:
> >
> > 060599fc23 package/rpi-userland: bump version to 188d3bf
> >
> > But else this might be a good idea to try to debug using git bisect
> > and move through the tree to see when it breaks.
> >
> > I don't really have a Pi at hand right now. But to reproduce someone
> > would need a minimal BR configuration which shows the issue. Can you
> provide that?
> 
> Could not reproduce the problem on RPi3 Model B+ with the following
> defconfig (with buildroot-master up to commit
> d1c3f077e24a41f004945f94aceb6f059c58e423):
> 
> BR2_arm=y
> BR2_cortex_a53=y
> BR2_ARM_FPU_NEON_VFPV4=y
> BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
> BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_4=y
> BR2_TOOLCHAIN_BUILDROOT_CXX=y
> BR2_SYSTEM_DHCP="eth0"
> BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi3/post-build.sh"
> BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi3/post-image.sh"
> BR2_ROOTFS_POST_SCRIPT_ARGS="--add-miniuart-bt-overlay"
> BR2_LINUX_KERNEL=y
> BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
> BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call
> github,raspberrypi,linux,1c64f4bc22811d2d371b271daa3fb27895a8abdd)/li
> nux-1c64f4bc22811d2d371b271daa3fb27895a8abdd.tar.gz"
> BR2_LINUX_KERNEL_DEFCONFIG="bcm2709"
> BR2_LINUX_KERNEL_DTS_SUPPORT=y
> BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2710-rpi-3-b bcm2710-rpi-3-b-
> plus bcm2710-rpi-cm3"
> BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
> BR2_PACKAGE_STRACE=y
> BR2_PACKAGE_RPI_FIRMWARE=y
> BR2_PACKAGE_OPENSSH=y
> BR2_TARGET_ROOTFS_EXT2=y
> BR2_TARGET_ROOTFS_EXT2_4=y
> BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
> # BR2_TARGET_ROOTFS_TAR is not set
> BR2_PACKAGE_HOST_DOSFSTOOLS=y
> BR2_PACKAGE_HOST_GENIMAGE=y
> BR2_PACKAGE_HOST_MTOOLS=y
> 
> 
> Mind to share your .config/defconfig file? Which (exact) hardware do you use?
> 
> Regards,
> Peter
> 
> 
> >
> > Regards,
> > Michael
> >
> >
> > On Thursday, August 13, 2020 16:51 CEST, Michael Fischer <mf@go-sys.de>
> wrote:
> >
> > > Hi Michael,
> > >  here is the log, the connection is closed from the server.
> > >
> > > PS: All settings between the commits are the same.
> > > The difference between this is only a git pull.
> > >
> > >
> > > OpenSSH_8.3p1, OpenSSL 1.1.1g  21 Apr 2020
> > > debug1: Reading configuration data /etc/ssh/ssh_config
> > > debug1: /etc/ssh/ssh_config line 20: Applying options for *
> > > debug1: Connecting to 192.168.1.194 [192.168.1.194] port 22.
> > > debug1: Connection established.
> > > debug1: identity file /root/.ssh/id_rsa type -1
> > > debug1: identity file /root/.ssh/id_rsa-cert type -1
> > > debug1: identity file /root/.ssh/id_dsa type -1
> > > debug1: identity file /root/.ssh/id_dsa-cert type -1
> > > debug1: identity file /root/.ssh/id_ecdsa type -1
> > > debug1: identity file /root/.ssh/id_ecdsa-cert type -1
> > > debug1: identity file /root/.ssh/id_ecdsa_sk type -1
> > > debug1: identity file /root/.ssh/id_ecdsa_sk-cert type -1
> > > debug1: identity file /root/.ssh/id_ed25519 type -1
> > > debug1: identity file /root/.ssh/id_ed25519-cert type -1
> > > debug1: identity file /root/.ssh/id_ed25519_sk type -1
> > > debug1: identity file /root/.ssh/id_ed25519_sk-cert type -1
> > > debug1: identity file /root/.ssh/id_xmss type -1
> > > debug1: identity file /root/.ssh/id_xmss-cert type -1
> > > debug1: Local version string SSH-2.0-OpenSSH_8.3
> > > debug1: Remote protocol version 2.0, remote software version
> > > OpenSSH_8.3
> > > debug1: match: OpenSSH_8.3 pat OpenSSH* compat 0x04000000
> > > debug1: Authenticating to 192.168.1.194:22 as 'root'
> > > debug1: SSH2_MSG_KEXINIT sent
> > > debug1: SSH2_MSG_KEXINIT received
> > > debug1: kex: algorithm: curve25519-sha256
> > > debug1: kex: host key algorithm: ecdsa-sha2-nistp256
> > > debug1: kex: server->client cipher: chacha20-poly1305 at openssh.com
> > > MAC: <implicit> compression: none
> > > debug1: kex: client->server cipher: chacha20-poly1305 at openssh.com
> > > MAC: <implicit> compression: none
> > > debug1: kex: curve25519-sha256 need=64 dh_need=64
> > > debug1: kex: curve25519-sha256 need=64 dh_need=64
> > > debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
> > > debug1: Server host key: ecdsa-sha2-nistp256
> > > SHA256:RCq6wRn5ZZrwZ7wY84zaMFMdG1mhIorheFPFhbwBz+0
> > > debug1: Host '[192.168.1.194]:22' is known and matches the ECDSA host
> key.
> > > debug1: Found key in /root/.ssh/known_hosts:1
> > > debug1: rekey out after 134217728 blocks
> > > debug1: SSH2_MSG_NEWKEYS sent
> > > debug1: expecting SSH2_MSG_NEWKEYS
> > > debug1: SSH2_MSG_NEWKEYS received
> > > debug1: rekey in after 134217728 blocks
> > > debug1: Will attempt key: /root/.ssh/id_rsa
> > > debug1: Will attempt key: /root/.ssh/id_dsa
> > > debug1: Will attempt key: /root/.ssh/id_ecdsa
> > > debug1: Will attempt key: /root/.ssh/id_ecdsa_sk
> > > debug1: Will attempt key: /root/.ssh/id_ed25519
> > > debug1: Will attempt key: /root/.ssh/id_ed25519_sk
> > > debug1: Will attempt key: /root/.ssh/id_xmss
> > > debug1: SSH2_MSG_EXT_INFO received
> > > debug1: kex_input_ext_info:
> > > server-sig-algs=<ssh-ed25519,sk-ssh-ed25519@openssh.com,ssh-rsa,rsa-
> > > sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp38
> > > 4,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256 at openssh.com>
> > > debug1: SSH2_MSG_SERVICE_ACCEPT received Connection closed by
> > > 192.168.1.194 port 22
> > >
> > > Regards,
> > >   Michael.
> > >
> > >
> > > > On Thursday, August 13, 2020 16:35 CEST, Michael Nosthoff
> > > > <buildroot@heine.tech>
> > > > wrote:
> > > >
> > > > Hi Michael,
> > > >
> > > > On Thursday, August 13, 2020 15:35 CEST, Michael Fischer
> > > > <mf@go-sys.de>
> > > > wrote:
> > > >
> > > > > Dear all,
> > > > >
> > > > > I have a problem with the OpenSSH login on my raspberry.
> > > > > I can't login via ssh, after entering the username, the sever
> > > > > closed the
> > > > connection.
> > > > >
> > > > > I have checked it with the commit
> > > > 01632805ab4be2bea4010ba1e46ab71f52d175a9 and this version
> works
> > > > with the same configuration.
> > > > > The actual commit doesn't work but  both commits have the same
> > > > > OpenSSH
> > > > version.
> > > > >
> > > > > OpenSSH Version is:  OpenSSH_8.3p1, OpenSSL 1.1.1g  21 Apr 2020
> > > > >
> > > > > My SSHD logofile:
> > > > >
> > > > > debug2: parse_server_config_depth: config reprocess config len
> > > > > 236
> > > > > debug3: auth_shadow_acctexpired: today 18487 sp_expire -1 days
> > > > > left -
> > > > 18488
> > > > > debug3: account expiration disabled
> > > > > debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM:
> 1
> > > > > debug3: mm_request_send entering: type 9
> > > > > debug2: monitor_read: 8 used once, disabling now
> > > > > debug2: input_userauth_request: setting up authctxt for root
> > > > > [preauth]
> > > > > debug3: mm_inform_authserv entering [preauth]
> > > > > debug3: mm_request_send entering: type 4 [preauth]
> > > > > debug2: input_userauth_request: try method none [preauth]
> > > > > debug3: mm_request_receive entering
> > > > > debug3: monitor_read: checking request 4
> > > > > debug3: mm_answer_authserv: service=ssh-connection, style=
> > > > > debug2: monitor_read: 4 used once, disabling now
> > > > > debug3: user_specific_delay: user specific delay 0.000ms
> > > > > [preauth]
> > > > > debug3: ensure_minimum_time_since: elapsed 10.528ms, delaying
> > > > 10.089ms (requested 5.154ms) [preauth]
> > > > > debug1: monitor_read_log: child log fd closed
> > > > > debug3: mm_request_receive entering
> > > > > debug1: do_cleanup
> > > > > debug1: Killing privsep child 390
> > > > >
> > > > > I don't know what is going wrong.
> > > > > Console login works and ftp also.
> > > > >
> > > > > Any help is welcome, I have no more idea where to look.
> > > > >
> > > >
> > > > Could you run the Client with the -v flag? So you could see if
> > > > actually the client or the server is closing the connection.
> > > > A pretty common problem is often a mismatch in available
> > > > authentication mechanisms (commonly "publickey,password").
> > > >
> > > > Also what sometimes is an issue is the permissions of the users
> > > > .ssh folder on the server side.
> > > > If it is globally readable sshd in many configurations refuses to
> > > > authenticate against it.
> > > >
> > > > Regards,
> > > > Michael
> > > >
> > > > >
> > > > > thanks,
> > > > >   Michael.
> > > > >
> > > > > _______________________________________________
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> > > >
> > > >
> > > >
> > >
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