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Bug#364635: marked as done (ssh: keyboard-interactive authentification does not work)

Your message dated Mon, 4 Jan 2010 01:24:21 +0000
with message-id <20100104012420.GA32561@riva.ucam.org>
and subject line Re: Bug#364635: bug #364635: problem solved
has caused the Debian Bug report #364635,
regarding ssh: keyboard-interactive authentification does not work
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
364635: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=364635
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: ssh
Version: 1:3.8.1p1-8.sarge.4
Severity: normal
Tags: sarge

Hello,

recently the keyboard-interactive authentification method of the ssh
version in Sarge stopped working for me.  The login process is just
aborted with a "Connection closed by [ip address]" message.  There
seems to be no error messages, neither in the server output, nor in
the client output.  The corresponding logs and my sshd_config file are
appended.

The same problem appears when I try to log in remotely.  Remote logins
used to work until a few days ago, and I cannot recall any significant
configuration changes since then.  The lastest updates were

    [UPGRADE] exim4 4.50-8 -> 4.50-8sarge2
    [UPGRADE] exim4-base 4.50-8 -> 4.50-8sarge2
    [UPGRADE] exim4-config 4.50-8 -> 4.50-8sarge2
    [UPGRADE] exim4-daemon-light 4.50-8 -> 4.50-8sarge2
    [UPGRADE] libc6 2.3.2.ds1-22 -> 2.3.2.ds1-22sarge3
    [UPGRADE] libc6-dev 2.3.2.ds1-22 -> 2.3.2.ds1-22sarge3
    [UPGRADE] libperl5.8 5.8.4-8sarge3 -> 5.8.4-8sarge4
    [UPGRADE] locales 2.3.2.ds1-22 -> 2.3.2.ds1-22sarge3
    [UPGRADE] mutt 1.5.9-2 -> 1.5.9-2sarge1
    [UPGRADE] perl 5.8.4-8sarge3 -> 5.8.4-8sarge4
    [UPGRADE] perl-base 5.8.4-8sarge3 -> 5.8.4-8sarge4
    [UPGRADE] perl-doc 5.8.4-8sarge3 -> 5.8.4-8sarge4
    [UPGRADE] perl-modules 5.8.4-8sarge3 -> 5.8.4-8sarge4
    [UPGRADE] tar 1.14-2.1 -> 1.14-2.2

Help how to solve this problem would be very welcome.  I understand
that bugs in sarge are not usually fixed, but since this is
potentially annoying (e.g. loosing the ability to log into a hosted
server), it might be good to document a work-around (if there is one)
somewhere.

I hope this helps,
Jochen

== client side =======================================================
> slogin -vvv localhost
OpenSSH_3.8.1p1 Debian-8.sarge.4, OpenSSL 0.9.7e 25 Oct 2004
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/voss/.ssh/identity type -1
debug1: identity file /home/voss/.ssh/id_rsa type -1
debug1: identity file /home/voss/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: match: OpenSSH_3.8.1p1 Debian-8.sarge.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1 Debian-8.sarge.4
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit: none,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 129/256
debug2: bits set: 560/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/voss/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 5
debug1: Host 'localhost' is known and matches the RSA host key.
debug1: Found key in /home/voss/.ssh/known_hosts:5
debug2: bits set: 541/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/voss/.ssh/identity ((nil))
debug2: key: /home/voss/.ssh/id_rsa ((nil))
debug2: key: /home/voss/.ssh/id_dsa ((nil))
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: start over, passed a different list publickey,password,keyboard-interactive
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/voss/.ssh/identity
debug3: no such identity: /home/voss/.ssh/identity
debug1: Trying private key: /home/voss/.ssh/id_rsa
debug3: no such identity: /home/voss/.ssh/id_rsa
debug1: Trying private key: /home/voss/.ssh/id_dsa
debug3: no such identity: /home/voss/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
Connection closed by 127.0.0.1
======================================================================


== server log (with log level DEBUG3) ================================
Apr 24 16:50:39 seehuhn sshd[26029]: Connection from ::ffff:127.0.0.1 port 3313
Apr 24 16:50:39 seehuhn sshd[26026]: debug1: Forked child 26029.
Apr 24 16:50:39 seehuhn sshd[26029]: debug1: Client protocol version 2.0; client software version OpenSSH_3.8.1p1 Debian-8.sarge.4
Apr 24 16:50:39 seehuhn sshd[26029]: debug1: match: OpenSSH_3.8.1p1 Debian-8.sarge.4 pat OpenSSH*
Apr 24 16:50:39 seehuhn sshd[26029]: debug1: Enabling compatibility mode for protocol 2.0
Apr 24 16:50:39 seehuhn sshd[26029]: debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1 Debian-8.sarge.4
Apr 24 16:50:39 seehuhn sshd[26029]: debug2: Network child is on pid 26030
Apr 24 16:50:39 seehuhn sshd[26029]: debug3: preauth child monitor started
Apr 24 16:50:39 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: monitor_read: checking request 0
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_answer_moduli: got parameters: 1024 1024 8192
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_request_send entering: type 1
Apr 24 16:50:40 seehuhn sshd[26029]: debug2: monitor_read: 0 used once, disabling now
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: monitor_read: checking request 4
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_answer_sign
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_answer_sign: signature 0x809dc50(143)
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_request_send entering: type 5
Apr 24 16:50:40 seehuhn sshd[26029]: debug2: monitor_read: 4 used once, disabling now
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: monitor_read: checking request 6
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_answer_pwnamallow
Apr 24 16:50:40 seehuhn sshd[26029]: debug3: mm_answer_pwnamallow: sending MONITOR_ANS_PWNAM: 1
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_request_send entering: type 7
Apr 24 16:50:41 seehuhn sshd[26029]: debug2: monitor_read: 6 used once, disabling now
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: monitor_read: checking request 45
Apr 24 16:50:41 seehuhn sshd[26029]: debug1: PAM: initializing for "voss"
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: Normalising mapped IPv4 in IPv6 address
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: Trying to reverse map address 127.0.0.1.
Apr 24 16:50:41 seehuhn sshd[26029]: debug1: PAM: setting PAM_RHOST to "localhost"
Apr 24 16:50:41 seehuhn sshd[26029]: debug1: PAM: setting PAM_TTY to "ssh"
Apr 24 16:50:41 seehuhn sshd[26029]: debug2: monitor_read: 45 used once, disabling now
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: monitor_read: checking request 3
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_answer_authserv: service=ssh-connection, style=
Apr 24 16:50:41 seehuhn sshd[26029]: debug2: monitor_read: 3 used once, disabling now
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: monitor_read: checking request 10
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_answer_authpassword: sending result 0
Apr 24 16:50:41 seehuhn sshd[26029]: debug3: mm_request_send entering: type 11
Apr 24 16:50:41 seehuhn sshd[26029]: Failed none for voss from ::ffff:127.0.0.1 port 3313 ssh2
Apr 24 16:50:42 seehuhn sshd[26029]: debug3: mm_request_receive entering
Apr 24 16:50:42 seehuhn sshd[26029]: debug3: monitor_read: checking request 48
Apr 24 16:50:42 seehuhn sshd[26029]: debug3: mm_answer_pam_init_ctx
Apr 24 16:50:42 seehuhn sshd[26029]: debug3: PAM: sshpam_init_ctx entering
======================================================================


== /etc/ssh/sshd_config ==============================================
# Package generated configuration file
# See the sshd(8) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 600
PermitRootLogin no
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile	%h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to no to disable s/key passwords
ChallengeResponseAuthentication yes

# Change to yes to enable tunnelled clear text passwords
PasswordAuthentication yes


# To change Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#AFSTokenPassing no
#KerberosTicketCleanup no

# Kerberos TGT Passing does only work with the AFS kaserver
#KerberosTgtPassing yes

X11Forwarding no
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
KeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

Subsystem	sftp	/usr/lib/sftp-server

UsePAM yes
======================================================================



-- System Information:
Debian Release: 3.1
Architecture: i386 (i686)
Kernel: Linux 2.6.12.4-bytemark-uml-20050811-1-full
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)

Versions of packages ssh depends on:
ii  adduser               3.63               Add and remove users and groups
ii  debconf               1.4.30.13          Debian configuration management sy
ii  dpkg                  1.10.28            Package maintenance system for Deb
ii  libc6                 2.3.2.ds1-22sarge3 GNU C Library: Shared libraries an
ii  libpam-modules        0.76-22            Pluggable Authentication Modules f
ii  libpam-runtime        0.76-22            Runtime support for the PAM librar
ii  libpam0g              0.76-22            Pluggable Authentication Modules l
ii  libssl0.9.7           0.9.7e-3sarge1     SSL shared libraries
ii  libwrap0              7.6.dbs-8          Wietse Venema's TCP wrappers libra
ii  zlib1g                1:1.2.2-4.sarge.2  compression library - runtime

-- debconf information:
  ssh/insecure_rshd:
  ssh/ssh2_keys_merged:
  ssh/user_environment_tell:
* ssh/forward_warning:
  ssh/insecure_telnetd:
  ssh/new_config: true
* ssh/use_old_init_script: true
* ssh/protocol2_only: true
  ssh/encrypted_host_key_but_no_keygen:
* ssh/run_sshd: true
* ssh/SUID_client: true
  ssh/disable_cr_auth: false

--- End Message ---
--- Begin Message --- 
Source: openssh
Source-Version: 1:4.1p1-1

On Sat, Jul 29, 2006 at 05:28:37PM +0100, Jochen Voß wrote:
> I still do not understand the ultimate cause of the problem, but the
> following patch (removing some woody compatibility hacks) solves the
> problem for me: after applying the patch the keyboard-interactive
> authentication method with PAM works.

> -	# Some 2.2 kernels have trouble with setres[ug]id() (bug #239999).
> -	perl -pi -e 's/.*#undef (BROKEN_SETRES[UG]ID).*/#define $$1 1/' build-deb/config.h
> -	# Supply pthread linkage for just those binaries linked to PAM.
> -	perl -pi -e 's/^(LIBPAM=.*)/$$1 -pthread/' build-deb/Makefile
> -
> -	$(MAKE) -C build-deb -j 2 ASKPASS_PROGRAM='/usr/bin/ssh-askpass' CFLAGS='$(OPTFLAGS) -g -Wall -DUSE_POSIX_THREADS -DLOGIN_PROGRAM=\"/bin/login\" -DLOGIN_NO_ENDOPT -DSSHD_PAM_SERVICE=\"ssh\" -DSSH_VERSION="\"$(SSH_VERSION)\""' SSH_KEYSIGN='/usr/lib/ssh-keysign'
> +	$(MAKE) -C build-deb ASKPASS_PROGRAM='/usr/bin/ssh-askpass' CFLAGS='$(OPTFLAGS) -g -Wall -DLOGIN_PROGRAM=\"/bin/login\" -DLOGIN_NO_ENDOPT -DSSHD_PAM_SERVICE=\"ssh\" -DSSH_VERSION="\"$(SSH_VERSION)\""' SSH_KEYSIGN='/usr/lib/ssh-keysign'

Thanks, and sorry for the long delay. I applied essentially the same
patch in openssh 1:4.1p1-1, and since we've had two stable Debian
releases since then I think it's probably reasonable to close this out;
I don't think I would ever get round to sarge maintenance at this point
even if I had somewhere to upload packages to for it!

Sorry,

-- 
Colin Watson                                       [cjwatson@debian.org]

--- End Message ---
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