Impossible to connect to an ssh server with Mysecureshell

Question

Hi,
I have a SSH server (openssh) with MySecureShell and fail2ban installed.
When I try to connect as an user whose shell is MySecureShell, I got "permission denied" (in terminal) or "critical error, impossible to connect" in filezilla. As soon as I replace /bin/MySecureShell by /bin/bash in /etc/passwd, I am able to connect. When I desactivate fail2ban, nothing changes. The problem is thus likely to come from MySecureShell.
I append my /etc/ssh/sshd_config:
# $OpenBSD: sshd_config,v 1.89 2013/02/06 00:20:42 dtucker Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
# The default requires explicit activation of protocol 1
#Protocol 2
# HostKey for protocol version 1
#HostKey /etc/ssh/ssh_host_key
# HostKeys for protocol version 2
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_dsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
# Lifetime and size of ephemeral version 1 server key
#KeyRegenerationInterval 1h
#ServerKeyBits 1024
# Logging
# obsoletes QuietMode and FascistLogging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
PermitRootLogin no
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
#RSAAuthentication yes
#PubkeyAuthentication yes
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#RhostsRSAAuthentication no
# similar for protocol version 2
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# RhostsRSAAuthentication and HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
#PasswordAuthentication yes
#PermitEmptyPasswords no
# Change to no to disable s/key passwords
ChallengeResponseAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#X11Forwarding no
#X11DisplayOffset 10
#X11UseLocalhost yes
PrintMotd no # pam does that
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
UsePrivilegeSeparation sandbox # Default for new installations.
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# override default of no subsystems
Subsystem sftp /usr/lib/ssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# ForceCommand cvs server
and my /etc/ssh/sftp_config:
## MySecureShell Configuration File ##
#Default rules for everybody
<Default>
GlobalDownload 0 #total speed download for all clients
# o -> bytes k -> kilo bytes m -> mega bytes
GlobalUpload 0 #total speed download for all clients (0 for unlimited)
Download 0 #limit speed download for each connection
Upload 0 #unlimit speed upload for each connection
StayAtHome true #limit client to his home
VirtualChroot true #fake a chroot to the home account
LimitConnection 10 #max connection for the server sftp
LimitConnectionByUser 10 #max connection for the account
LimitConnectionByIP 10 #max connection by ip for the account
Home /home/$USER #overrite home of the user but if you want you can use
# environment variable (ie: Home /home/$USER)
IdleTimeOut 5m #(in second) deconnect client is idle too long time
ResolveIP true #resolve ip to dns
# IgnoreHidden true #treat all hidden files as if they don't exist
# DirFakeUser true #Hide real file/directory owner (just change displayed permissions)
# DirFakeGroup true #Hide real file/directory group (just change displayed permissions)
# DirFakeMode 0400 #Hide real file/directory rights (just change displayed permissions)
#Add execution right for directory if read right is set
HideNoAccess true #Hide file/directory which user has no access
# MaxOpenFilesForUser 20 #limit user to open x files on same time
# MaxWriteFilesForUser 10 #limit user to x upload on same time
# MaxReadFilesForUser 10 #limit user to x download on same time
DefaultRights 0666 0777 #Set default rights for new file and new directory
# MinimumRights 0400 0700 #Set minimum rights for files and dirs
ShowLinksAsLinks false #show links as their destinations
# ConnectionMaxLife 1d #limits connection lifetime to 1 day
# Charset "ISO-8859-15" #set charset of computer
</Default>
#Rules only for group ftp
#<Group ftp>
# Download 25 k/s
# LogFile /var/log/sftp-server_ftp.log #Change logfile
# ExpireDate "2007-02-28 18:31:01"
#</Group>
#<Group sftp_administrator>
# IsAdmin true #can admin the server
# VirtualChroot false #you must disable chroot to have a full support of admin
# StayAtHome true
# IdleTimeOut 0
#</Group>
#<Group old_client>
# SftpProtocol 3 #force protocol SFTP
# DisableAccount true #disable account
#</Group>
#Rules only for group ftpnolimit
#<Group ftpnolimit>
# Download 0 #0 = unlimited
# IdleTimeOut 0 #no timeout
# DirFakeUser false #show real user on file/directory
# DirFakeGroup false #show real group on file/directory
# DirFakeMode 0 #show real rights on file/directory
# MaxReadFilesForUser 0 #0 = unlimited but still have the restriction MaxOpenFilesForUser
#</Group>
#<IpRange 192.168.0.1-192.168.0.5>
# ByPassGlobalDownload true #bypass GlobalDownload restriction
# ByPassGlobalUpload true #bypass GlobalUpload restriction
# Download 0
# DisableAccount false #enable account
# IdleTimeOut 0 #disable timeout
# LimitConnectionByIP 0 #no limit
#</IpRange>
#<Group trusted_users>
# Shell /bin/tcsh #give a shell access to TRUSTED clients !!!
#</Group>
#<VirtualHost *:22>
# DirFakeUser false #show real user on file/directory
# DirFakeGroup false #show real group on file/directory
# DirFakeMode 0 #show real rights on file/directory
# HideNoAccess false
# IgnoreHidden false
#</VirtualHost>
#Include /etc/my_sftp_config_file #include this valid configuration file
My installation is up to date.
Please let me know if you need supplementary info.
Last edited by Vincent D (2013-04-15 09:54:06)

Answer 1

Vincent D wrote:
Gat wrote:I'm getting the same error, but without using MySecureShell. The problem occurs with any script being placed in user's home directory and specified in /etc/passwd instead of /bin/bash. It's possible for a user to log in to bash and then run the script, so it doesn't seem to be a file permission problem.
Do you also get the "permission denied"?
My workaround is to purely remove MySecureShell, but this is not very safe.
Yes I'm also getting a permission denied error. I guess this might be something we need to set in PAM config, but I wasn't able to find it.