| 1 | '\" t
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| 2 | .\" Title: cifs.upcall
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| 3 | .\" Author: [see the "AUTHOR" section]
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
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| 5 | .\" Date: 06/14/2011
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| 6 | .\" Manual: System Administration tools
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| 7 | .\" Source: Samba 3.5
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "CIFS\&.UPCALL" "8" "06/14/2011" "Samba 3\&.5" "System Administration tools"
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| 11 | .\" -----------------------------------------------------------------
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| 12 | .\" * set default formatting
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| 13 | .\" -----------------------------------------------------------------
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| 14 | .\" disable hyphenation
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| 15 | .nh
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| 16 | .\" disable justification (adjust text to left margin only)
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| 17 | .ad l
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| 18 | .\" -----------------------------------------------------------------
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| 19 | .\" * MAIN CONTENT STARTS HERE *
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| 20 | .\" -----------------------------------------------------------------
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| 21 | .SH "NAME"
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| 22 | cifs.upcall \- Userspace upcall helper for Common Internet File System (CIFS)
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| 23 | .SH "SYNOPSIS"
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| 24 | .HP \w'\ 'u
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| 25 | cifs\&.upcall [\-\-trust\-dns|\-t] [\-\-version|\-v] {keyid}
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| 26 | .SH "DESCRIPTION"
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| 27 | .PP
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| 28 | This tool is part of the
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| 29 | \fBsamba\fR(7)
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| 30 | suite\&.
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| 31 | .PP
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| 32 | 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\&.
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| 33 | .PP
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| 34 | cifs\&.upcall is generally intended to be run when the kernel calls request\-key(8)
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| 35 | 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\&.
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| 36 | .SH "OPTIONS"
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| 37 | .PP
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| 38 | \-c
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| 39 | .RS 4
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| 40 | This option is deprecated and is currently ignored\&.
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| 41 | .RE
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| 42 | .PP
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| 43 | \-\-trust\-dns|\-t
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| 44 | .RS 4
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| 45 | 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\&.
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| 46 | .sp
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| 47 | 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\&.
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| 48 | .RE
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| 49 | .PP
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| 50 | \-\-version|\-v
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| 51 | .RS 4
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| 52 | Print version number and exit\&.
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| 53 | .RE
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| 54 | .SH "CONFIGURATION FOR KEYCTL"
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| 55 | .PP
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| 56 | cifs\&.upcall is designed to be called from the kernel via the request\-key callout program\&. This requires that request\-key be told where and how to call this program\&. The current cifs\&.upcall program handles two different key types:
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| 57 | .PP
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| 58 | cifs\&.spnego
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| 59 | .RS 4
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| 60 | This keytype is for retrieving kerberos session keys
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| 61 | .RE
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| 62 | .PP
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| 63 | dns_resolver
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| 64 | .RS 4
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| 65 | This key type is for resolving hostnames into IP addresses
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| 66 | .RE
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| 67 | .PP
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| 68 | To make this program useful for CIFS, you\'ll need to set up entries for them in request\-key\&.conf(5)\&. Here\'s an example of an entry for each key type:
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| 69 | .sp
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| 70 | .if n \{\
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| 71 | .RS 4
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| 72 | .\}
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| 73 | .nf
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| 74 | #OPERATION TYPE D C PROGRAM ARG1 ARG2\&.\&.\&.
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| 75 | #========= ============= = = ================================
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| 76 | create cifs\&.spnego * * /usr/local/sbin/cifs\&.upcall %k
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| 77 | create dns_resolver * * /usr/local/sbin/cifs\&.upcall %k
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| 78 | .fi
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| 79 | .if n \{\
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| 80 | .RE
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| 81 | .\}
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| 82 | .PP
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| 83 | See
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| 84 | \fBrequest-key.conf5\fR()
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| 85 | for more info on each field\&.
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| 86 | .SH "SEE ALSO"
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| 87 | .PP
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| 88 |
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| 89 | \fBrequest-key.conf\fR(5),
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| 90 | \fBmount.cifs\fR(8)
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| 91 | .SH "AUTHOR"
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| 92 | .PP
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| 93 | Igor Mammedov wrote the cifs\&.upcall program\&.
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| 94 | .PP
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| 95 | Jeff Layton authored this manpage\&.
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| 96 | .PP
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| 97 | The maintainer of the Linux CIFS VFS is Steve French\&.
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| 98 | .PP
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| 99 | The
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| 100 | Linux CIFS Mailing list
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| 101 | is the preferred place to ask questions regarding these programs\&.
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