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Thread: Sharing subdirs to multiple hosts using NFS and samba fails

  1. Question Sharing subdirs to multiple hosts using NFS and samba fails

    Hi!

    Trying to share a directory with NFS works fine, then another time as CIFS fails with error:
    session setup failed: NT_STATUS_LOGON_FAILURE

    Users exist in /etc/passwd and /etc/samba/samba-passwd

    Code:
     smbclient -L //bigmama12 -N -W WORKGROUP
    Anonymous login successful
    Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.2.4-11.1-3616-SUSE-SLE_12-x86_64]
    
            Sharename       Type      Comment
            ---------       ----      -------
            sapmnt          Disk      TRANSDIR
            data            Disk      Common information
            IPC$            IPC       IPC Service (Samba 4.2.4-11.1-3616-SUSE-SLE_12-x86_64)
    Anonymous login successful
    Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.2.4-11.1-3616-SUSE-SLE_12-x86_64]
    
            Server               Comment
            ---------            -------
            BIGMA50P
            BIGMAMA12             Samba 4.2.4-11.1-3616-SUSE-SLE_12-x86_64
            NASF886E3            NAS Server
    
            Workgroup            Master
            ---------            -------
            WORKGROUP            BIGMAMA12
    I wonder where I got 3 servers from...

    Anyway listing is fine so far beside that anomaly.

    smbclient -L //desap60f -U ralf
    Enter ralf's password:
    session setup failed: NT_STATUS_LOGON_FAILURE

    Checked password for OS and samba, re-entered password to make sure it matches.

    Same result: session setup failed: NT_STATUS_LOGON_FAILURE

    Did I miss something?
    Code:
     testparm
    Load smb config files from /etc/samba/smb.conf
    rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
    Processing section "[sapmnt]"
    Processing section "[data]"
    Loaded services file OK.
    Server role: ROLE_STANDALONE
    
    Press enter to see a dump of your service definitions
    
    # Global parameters
    [global]
            security = USER
            passdb backend = smbpasswd:samba-passwd
            add machine script = /usr/sbin/useradd -c Machine -d /var/lib/nobody -s /bin/false %m$
            domain master = No
            wins support = Yes
            idmap config * : backend = tdb
    
    
    [sapmnt]
            comment = TRANSDIR
            path = /data/transdir
            read only = No
            inherit acls = Yes
    
    
    [data]
            comment = Common information
            path = /data
            valid users = ralf
            read only = No
            inherit acls = Yes

  2. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Hi startsels12,

    > Did I miss something?

    have you checked the smb log? In case it currently lists only insufficient details, increase the debug level.

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

  3. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Thanks for your advice.
    [2016/05/12 13:15:25.788383, 3] ../source3/auth/auth.c:178(auth_check_ntlm_password)
    check_ntlm_password: Checking password for unmapped user [WORKGROUP]\[ralf]@[LNXSLES12] with the new password interface
    [2016/05/12 13:15:25.788413, 3] ../source3/auth/auth.c:181(auth_check_ntlm_password)
    check_ntlm_password: mapped user is: [BIGMAMA12]\[ralf]@[LNXSLES12]
    [2016/05/12 13:15:25.788551, 3] ../source3/auth/check_samsec.c:400(check_sam_security)
    check_sam_security: Couldn't find user 'ralf' in passdb.
    [2016/05/12 13:15:25.788594, 2] ../source3/auth/auth.c:315(auth_check_ntlm_password)
    check_ntlm_password: Authentication for user [ralf] -> [ralf] FAILED with error NT_STATUS_NO_SUCH_USER
    [2016/05/12 13:15:25.788644, 2] ../auth/gensec/spnego.c:746(gensec_spnego_server_negTokenTarg)
    SPNEGO login failed: NT_STATUS_NO_SUCH_USER
    [2016/05/12 13:15:25.788716, 3] ../source3/smbd/error.c:82(error_packet_set)
    NT error packet at ../source3/smbd/sesssetup.c(267) cmd=115 (SMBsesssetupX) NT_STATUS_LOGON_FAILURE
    [2016/05/12 13:15:25.789160, 3] ../source3/smbd/server_exit.c:249(exit_server_common)
    Server exit (failed to receive smb request)
    Unfortunately there is not much I can get out of the log, while in fact user has entries in /etc/passwd as well as /etc/samba/samba-passwd

  4. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Hi startsles12,

    Quote Originally Posted by startsles12 View Post
    Thanks for your advice.

    Unfortunately there is not much I can get out of the log, while in fact user has entries in /etc/passwd as well as /etc/samba/samba-passwd
    Code:
    check_sam_security: Couldn't find user 'ralf' in passdb.
    smbd couldn't find the user in the configured passdb backend. Depending on your setup (which I know nothing about), this may have nothing to do with a file called /etc/samba/samba-passwd ...

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

  5. Sharing subdirs to multiple hosts using NFS and samba fa

    Well I can't see anything wrong here

    testparm -v
    # Global parameters
    [global]
    dos charset = CP850
    unix charset = UTF-8
    workgroup = WORKGROUP
    realm =
    netbios name = BIGMAMA12
    netbios aliases =
    netbios scope =
    server string = Samba 4.2.4-11.1-3616-SUSE-SLE_12-x86_64
    interfaces =
    bind interfaces only = No
    config backend = file
    server role = auto
    security = USER
    auth methods =
    encrypt passwords = Yes
    client schannel = Auto
    server schannel = Auto
    allow trusted domains = Yes
    map to guest = Never
    null passwords = No
    old password allowed period = 60
    obey pam restrictions = No
    password server = *
    smb passwd file = /var/lib/samba/private/smbpasswd
    private dir = /var/lib/samba/private
    passdb backend = smbpasswd:samba-passwd
    algorithmic rid base = 1000
    root directory =
    guest account = nobody
    enable privileges = Yes
    pam password change = No
    passwd program =
    passwd chat = *new*password* %n\n *new*password* %n\n *changed*
    passwd chat debug = No
    passwd chat timeout = 2
    check password script =
    username map =
    username level = 0
    unix password sync = No
    restrict anonymous = 0
    lanman auth = No
    ntlm auth = Yes
    client NTLMv2 auth = Yes
    client lanman auth = No
    client plaintext auth = No
    client use spnego principal = No
    preload modules =
    dedicated keytab file =
    kerberos method = default
    map untrusted to domain = No
    log level = 2
    syslog = 1
    syslog only = No
    log file =
    max log size = 5000
    debug timestamp = Yes
    debug prefix timestamp = No
    debug hires timestamp = Yes
    debug pid = No
    debug uid = No
    debug class = No
    enable core files = Yes
    smb ports = 445 139
    large readwrite = Yes
    server max protocol = SMB3
    server min protocol = LANMAN1
    client max protocol = default
    client min protocol = CORE
    unicode = Yes
    min receivefile size = 0
    read raw = Yes
    write raw = Yes
    disable netbios = No
    reset on zero vc = No
    log writeable files on exit = No
    defer sharing violations = Yes
    nt pipe support = Yes
    nt status support = Yes
    max mux = 50
    max xmit = 16644
    name resolve order = lmhosts wins host bcast
    max ttl = 259200
    max wins ttl = 518400
    min wins ttl = 21600
    time server = No
    unix extensions = Yes
    use spnego = Yes
    client signing = default
    server signing = default
    client use spnego = Yes
    client ldap sasl wrapping = sign
    enable asu support = No
    svcctl list =
    cldap port = 389
    dgram port = 138
    nbt port = 137
    krb5 port = 88
    kpasswd port = 464
    web port = 901
    rpc big endian = No
    deadtime = 0
    getwd cache = Yes
    keepalive = 300
    lpq cache time = 30
    max smbd processes = 0
    max disk size = 0
    max open files = 16384
    socket options = TCP_NODELAY
    use mmap = Yes
    use ntdb = No
    hostname lookups = No
    name cache timeout = 660
    ctdbd socket =
    cluster addresses =
    clustering = No
    ctdb timeout = 0
    ctdb locktime warn threshold = 0
    smb2 max read = 8388608
    smb2 max write = 8388608
    smb2 max trans = 8388608
    smb2 max credits = 8192
    load printers = Yes
    printcap cache time = 750
    printcap name =
    cups server =
    cups encrypt = No
    cups connection timeout = 30
    iprint server =
    disable spoolss = No
    addport command =
    enumports command =
    addprinter command =
    deleteprinter command =
    show add printer wizard = Yes
    os2 driver map =
    mangling method = hash2
    mangle prefix = 1
    max stat cache size = 256
    stat cache = Yes
    machine password timeout = 604800
    add user script =
    rename user script =
    delete user script =
    add group script =
    delete group script =
    add user to group script =
    delete user from group script =
    set primary group script =
    add machine script = /usr/sbin/useradd -c Machine -d /var/lib/nobody -s /bin/false %m$
    shutdown script =
    abort shutdown script =
    username map script =
    username map cache time = 0
    logon script =
    logon path = \\%N\%U\profile
    logon drive =
    logon home = \\%N\%U
    domain logons = No
    init logon delayed hosts =
    init logon delay = 100
    os level = 20
    lm announce = Auto
    lm interval = 60
    preferred master = Auto
    local master = Yes
    domain master = No
    browse list = Yes
    enhanced browsing = Yes
    dns proxy = Yes
    wins proxy = No
    wins server =
    wins support = Yes
    wins hook =
    smb2 leases = No
    lock spin time = 200
    oplock break wait time = 0
    ldap admin dn =
    ldap delete dn = No
    ldap group suffix =
    ldap idmap suffix =
    ldap machine suffix =
    ldap passwd sync = no
    ldap replication sleep = 1000
    ldap suffix =
    ldap ssl = start tls
    ldap ssl ads = No
    ldap deref = auto
    ldap follow referral = Auto
    ldap timeout = 15
    ldap connection timeout = 2
    ldap page size = 1024
    ldap user suffix =
    ldap debug level = 0
    ldap debug threshold = 10
    eventlog list =
    add share command =
    change share command =
    delete share command =
    config file =
    preload =
    lock directory = /var/lib/samba
    state directory = /var/lib/samba
    cache directory = /var/lib/samba
    pid directory = /run/samba
    ntp signd socket directory = /var/lib/samba/ntp_signd
    utmp directory =
    wtmp directory =
    utmp = No
    default service =
    message command =
    get quota command =
    set quota command =
    remote announce =
    remote browse sync =
    nbt client socket address = 0.0.0.0
    nmbd bind explicit broadcast = Yes
    homedir map = auto.home
    afs username map =
    afs token lifetime = 604800
    log nt token command =
    NIS homedir = No
    registry shares = No
    usershare allow guests = No
    usershare max shares = 0
    usershare owner only = Yes
    usershare path = /var/lib/samba/usershares
    usershare prefix allow list =
    usershare prefix deny list =
    usershare template share =
    allow insecure wide links = No
    async smb echo handler = No
    panic action =
    perfcount module =
    host msdfs = Yes
    passdb expand explicit = No
    idmap backend = tdb
    idmap cache time = 604800
    idmap negative cache time = 120
    idmap uid =
    idmap gid =
    template homedir = /home/%D/%U
    template shell = /bin/false
    winbind separator = \
    winbind cache time = 300
    winbind reconnect delay = 30
    winbind request timeout = 60
    winbind max clients = 200
    winbind enum users = No
    winbind enum groups = No
    winbind use default domain = No
    winbind trusted domains only = No
    winbind nested groups = Yes
    winbind expand groups = 0
    winbind nss info = template
    winbind refresh tickets = No
    winbind offline logon = No
    winbind normalize names = No
    winbind rpc only = No
    create krb5 conf = Yes
    ncalrpc dir = /var/run/samba/ncalrpc
    winbind max domain connections = 1
    winbindd socket directory = /var/run/samba/winbindd
    winbindd privileged socket directory = /var/lib/samba/winbindd_privileged
    winbind sealed pipes = Yes
    neutralize nt4 emulation = No
    reject md5 servers = No
    require strong key = Yes
    allow dns updates = secure only
    dns forwarder =
    dns update command = /usr/sbin/samba_dnsupdate
    nsupdate command = /usr/bin/nsupdate -g
    rndc command = /usr/sbin/rndc
    multicast dns register = Yes
    samba kcc command = /usr/sbin/samba_kcc
    server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl, winbindd, ntp_signd, kcc, dnsupdate, dns
    dcerpc endpoint servers = epmapper, wkssvc, rpcecho, samr, netlogon, lsarpc, spoolss, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey, dnsserver
    spn update command = /usr/sbin/samba_spnupdate
    share backend = classic
    allow nt4 crypto = No
    reject md5 clients = No
    tls enabled = Yes
    tls keyfile = tls/key.pem
    tls certfile = tls/cert.pem
    tls cafile = tls/ca.pem
    tls crlfile =
    tls dh params file =
    idmap config * : backend = tdb
    comment =
    path =
    username =
    invalid users =
    valid users =
    admin users =
    read list =
    write list =
    force user =
    force group =
    read only = Yes
    acl check permissions = Yes
    acl group control = No
    acl map full control = Yes
    acl allow execute always = No
    create mask = 0744
    force create mode = 0000
    directory mask = 0755
    force directory mode = 0000
    force unknown acl user = No
    inherit permissions = No
    inherit acls = No
    inherit owner = No
    guest only = No
    administrative share = No
    guest ok = No
    only user = No
    hosts allow =
    hosts deny =
    allocation roundup size = 1048576
    aio read size = 0
    aio write size = 0
    aio write behind =
    ea support = No
    nt acl support = Yes
    profile acls = No
    map acl inherit = No
    afs share = No
    smb encrypt = default
    durable handles = Yes
    block size = 1024
    change notify = Yes
    directory name cache size = 100
    kernel change notify = Yes
    max connections = 0
    min print space = 0
    strict allocate = No
    strict rename = No
    strict sync = No
    sync always = No
    use sendfile = No
    write cache size = 0
    max reported print jobs = 0
    max print jobs = 1000
    printable = No
    print notify backchannel = No
    print ok = No
    printing = cups
    cups options =
    print command =
    lpq command = %p
    lprm command =
    lppause command =
    lpresume command =
    queuepause command =
    queueresume command =
    printer name =
    use client driver = No
    default devmode = Yes
    force printername = No
    printjob username = %U
    default case = lower
    case sensitive = Auto
    preserve case = Yes
    short preserve case = Yes
    mangling char = ~
    hide dot files = Yes
    hide special files = No
    hide unreadable = No
    hide unwriteable files = No
    delete veto files = No
    veto files =
    hide files =
    veto oplock files =
    map archive = Yes
    map hidden = No
    map system = No
    map readonly = yes
    mangled names = Yes
    store dos attributes = No
    dmapi support = No
    browseable = Yes
    access based share enum = No
    blocking locks = Yes
    csc policy = manual
    fake oplocks = No
    kernel oplocks = No
    kernel share modes = Yes
    locking = Yes
    oplocks = Yes
    level2 oplocks = Yes
    oplock contention limit = 2
    posix locking = Yes
    strict locking = Auto
    dfree cache time = 0
    dfree command =
    copy =
    include =
    preexec =
    preexec close = No
    postexec =
    root preexec =
    root preexec close = No
    root postexec =
    available = Yes
    volume =
    fstype = NTFS
    wide links = No
    follow symlinks = Yes
    dont descend =
    magic script =
    magic output =
    delete readonly = No
    dos filemode = No
    dos filetimes = Yes
    dos filetime resolution = No
    fake directory create times = No
    vfs objects =
    msdfs root = No
    msdfs proxy =
    ntvfs handler = unixuid, default

  6. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Hi startsles12,

    [QUOTE=startsles12;32537]Well I can't see anything wrong here
    Code:
    passdb backend = smbpasswd:samba-passwd
    [/QUOTE]

    well, I'd change that to provide a fully qualified path...

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

  7. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Quote Originally Posted by jmozdzen View Post
    fully qualified path...
    That's it!

    I did assume smb passwd file would take the absolute path.

    Changed two lines and all seems fine now

    smb passwd file = /etc/samba/samba-passwd
    passdb backend = smbpasswd:/etc/samba/samba-passwd
    Thanks a lot for hinting the right direction

  8. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Hi startsles12,

    great to see it's fixed, thank you for reporting back!

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

  9. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    If I might dare to pickup again on this topic, I managed to hide sharenames by setting "browsable = no", but there seems to be a insecure setting I'd like to prevent:

    CIFSRPC nullsession exploitable, can list shares, can read registry, can enumerate users

    Any way to block null session detected by Nessus?

    I assume a "map to guest = Never" in the global section would do the trick...
    Last edited by startsles12; 19-May-2016 at 14:54.

  10. Re: Sharing subdirs to multiple hosts using NFS and samba fa

    Hi startsels12,
    Quote Originally Posted by startsles12 View Post
    If I might dare to pickup again on this topic, I managed to hide sharenames by setting "browsable = no", but there seems to be a insecure setting I'd like to prevent:

    CIFSRPC nullsession exploitable, can list shares, can read registry, can enumerate users

    Any way to block null session detected by Nessus?

    I assume a "map to guest = Never" in the global section would do the trick...
    as this is a new issue, it probably'd be better to start a new thread for this - especially as it addresses a security concern.

    Are you using the latest updates to Samba? There have been important recent updates in that area. I'm not those cover the issue caught by Nessus, but installing these updates is more than worth it.

    Regards,
    Jens
    From the times when today's "old school" was "new school"

    If you find this post helpful and are logged into the web interface, show your appreciation and click on the star below...

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