Je n'ai pas de répertoire etc/sshd, j'ai seulement le répertoire etc/ssh/sftp_config qui contient : ## MySecureShell Configuration File ##
#Default rules for everybody
<Default>
    GlobalDownload        50k    #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         5k    #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    1    #max connection for the account
    LimitConnectionByIP    2    #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
#    HideFiles        "^(lost\+found|public_html)$"    #Hide file/directory which match
                                #this extented POSIX regex
    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        0640 0750    #Set default rights for new file and new directory
#    MinimumRights        0400 0700    #Set minimum rights for files and dirs

#    PathDenyFilter        "^\."    #deny upload of directory/file which match this extented POSIX regex

    ShowLinksAsLinks    false    #show links as their destinations
#    ConnectionMaxLife    1d    #limits connection lifetime to 1 day

#    Charset            "ISO-8859-15"    #set charset of computer
#    GMTTime            +1    #set GMT Time (change if necessary)
</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
#    HideFiles        ""    #show all files
#    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

Je pense Ubuntu,  je suis parti de cette page :

http://doc.ubuntu-fr.org/mysecureshell_sftp-server