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    Command:

    cifs.upcall

    
    
    
    

    SYNOPSIS

           cifs.upcall [--trust-dns|-t] [--version|-v] [--legacy-uid|-l] {keyid}
    
    
    

    DESCRIPTION

           This tool is part of the cifs-utils suite.
    
           cifs.upcall is a userspace helper program for the linux CIFS client
           filesystem. There are a number of activities that the kernel cannot
           easily do itself. This program is a callout program that does these
           things for the kernel and then returns the result.
    
           cifs.upcall is generally intended to be run when the kernel calls
           request-key(8) for a particular key type. While it can be run directly
           from the command-line, it?s not generally intended to be run that way.
    
    
    

    OPTIONS

           -c
               This option is deprecated and is currently ignored.
    
           --trust-dns|-t
               With krb5 upcalls, the name used as the host portion of the service
               principal defaults to the hostname portion of the UNC. This option
               allows the upcall program to reverse resolve the network address of
               the server in order to get the hostname.
    
               This is less secure than not trusting DNS. When using this option,
               it?s possible that an attacker could get control of DNS and trick
               the client into mounting a different server altogether. It?s
               preferable to instead add server principals to the KDC for every
               possible hostname, but this option exists for cases where that
               isn?t possible. The default is to not trust reverse hostname
               lookups in this fashion.
    
           --legacy-uid|-l
               Traditionally, the kernel has sent only a single uid= parameter to
               the upcall for the SPNEGO upcall that?s used to determine what
               user's credential cache to use. This parameter is affected by the
               uid= mount option, which also governs the ownership of files on the
               mount.
    
               Newer kernels send a creduid= option as well, which contains what
               uid it thinks actually owns the credentials that it?s looking for.
               At mount time, this is generally set to the real uid of the user
               doing the mount. For multisession mounts, it's set to the fsuid of
               the mount user. Set this option if you want cifs.upcall to use the
               older uid= parameter instead of the creduid= parameter.
    
           --version|-v
               Print version number and exit.
    
    
    

    CONFIGURATION FOR KEYCTL

           type:
    
               #OPERATION  TYPE           D C PROGRAM ARG1 ARG2...
               #=========  =============  = = ================================
               create      cifs.spnego    * * /usr/sbin/cifs.upcall %k
               create      dns_resolver   * * /usr/sbin/cifs.upcall %k
    
           See request-key.conf(5) for more info on each field.
    
           The keyutils package has also started including a dns_resolver handling
           program as well that is preferred over the one in cifs.upcall. If you
           are using a keyutils version equal to or greater than 1.5, you should
           use key.dns_resolver to handle the dns_resolver keytype instead of
           cifs.upcall. See key.dns_resolver(8) for more info.
    
    
    

    SEE ALSO

           request-key.conf(5), mount.cifs(8), key.dns_resolver(8)
    
    
    

    AUTHOR

           Igor Mammedov wrote the cifs.upcall program.
    
           Jeff Layton authored this manpage.
    
           The maintainer of the Linux CIFS VFS is Steve French.
    
           The Linux CIFS Mailing list is the preferred place to ask questions
           regarding these programs.
    
    
    

    cifs-utils 4.0 02/07/2010 CIFS.UPCALL(8)

    
    
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