| 1 | .\" Title: cifs.upcall
|
|---|
| 2 | .\" Author: [see the "AUTHOR" section]
|
|---|
| 3 | .\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/>
|
|---|
| 4 | .\" Date: 02/22/2010
|
|---|
| 5 | .\" Manual: System Administration tools
|
|---|
| 6 | .\" Source: Samba 3.3
|
|---|
| 7 | .\" Language: English
|
|---|
| 8 | .\"
|
|---|
| 9 | .TH "CIFS\&.UPCALL" "8" "02/22/2010" "Samba 3\&.3" "System Administration tools"
|
|---|
| 10 | .\" -----------------------------------------------------------------
|
|---|
| 11 | .\" * (re)Define some macros
|
|---|
| 12 | .\" -----------------------------------------------------------------
|
|---|
| 13 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 14 | .\" toupper - uppercase a string (locale-aware)
|
|---|
| 15 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 16 | .de toupper
|
|---|
| 17 | .tr aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ
|
|---|
| 18 | \\$*
|
|---|
| 19 | .tr aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz
|
|---|
| 20 | ..
|
|---|
| 21 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 22 | .\" SH-xref - format a cross-reference to an SH section
|
|---|
| 23 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 24 | .de SH-xref
|
|---|
| 25 | .ie n \{\
|
|---|
| 26 | .\}
|
|---|
| 27 | .toupper \\$*
|
|---|
| 28 | .el \{\
|
|---|
| 29 | \\$*
|
|---|
| 30 | .\}
|
|---|
| 31 | ..
|
|---|
| 32 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 33 | .\" SH - level-one heading that works better for non-TTY output
|
|---|
| 34 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 35 | .de1 SH
|
|---|
| 36 | .\" put an extra blank line of space above the head in non-TTY output
|
|---|
| 37 | .if t \{\
|
|---|
| 38 | .sp 1
|
|---|
| 39 | .\}
|
|---|
| 40 | .sp \\n[PD]u
|
|---|
| 41 | .nr an-level 1
|
|---|
| 42 | .set-an-margin
|
|---|
| 43 | .nr an-prevailing-indent \\n[IN]
|
|---|
| 44 | .fi
|
|---|
| 45 | .in \\n[an-margin]u
|
|---|
| 46 | .ti 0
|
|---|
| 47 | .HTML-TAG ".NH \\n[an-level]"
|
|---|
| 48 | .it 1 an-trap
|
|---|
| 49 | .nr an-no-space-flag 1
|
|---|
| 50 | .nr an-break-flag 1
|
|---|
| 51 | \." make the size of the head bigger
|
|---|
| 52 | .ps +3
|
|---|
| 53 | .ft B
|
|---|
| 54 | .ne (2v + 1u)
|
|---|
| 55 | .ie n \{\
|
|---|
| 56 | .\" if n (TTY output), use uppercase
|
|---|
| 57 | .toupper \\$*
|
|---|
| 58 | .\}
|
|---|
| 59 | .el \{\
|
|---|
| 60 | .nr an-break-flag 0
|
|---|
| 61 | .\" if not n (not TTY), use normal case (not uppercase)
|
|---|
| 62 | \\$1
|
|---|
| 63 | .in \\n[an-margin]u
|
|---|
| 64 | .ti 0
|
|---|
| 65 | .\" if not n (not TTY), put a border/line under subheading
|
|---|
| 66 | .sp -.6
|
|---|
| 67 | \l'\n(.lu'
|
|---|
| 68 | .\}
|
|---|
| 69 | ..
|
|---|
| 70 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 71 | .\" SS - level-two heading that works better for non-TTY output
|
|---|
| 72 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 73 | .de1 SS
|
|---|
| 74 | .sp \\n[PD]u
|
|---|
| 75 | .nr an-level 1
|
|---|
| 76 | .set-an-margin
|
|---|
| 77 | .nr an-prevailing-indent \\n[IN]
|
|---|
| 78 | .fi
|
|---|
| 79 | .in \\n[IN]u
|
|---|
| 80 | .ti \\n[SN]u
|
|---|
| 81 | .it 1 an-trap
|
|---|
| 82 | .nr an-no-space-flag 1
|
|---|
| 83 | .nr an-break-flag 1
|
|---|
| 84 | .ps \\n[PS-SS]u
|
|---|
| 85 | \." make the size of the head bigger
|
|---|
| 86 | .ps +2
|
|---|
| 87 | .ft B
|
|---|
| 88 | .ne (2v + 1u)
|
|---|
| 89 | .if \\n[.$] \&\\$*
|
|---|
| 90 | ..
|
|---|
| 91 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 92 | .\" BB/BE - put background/screen (filled box) around block of text
|
|---|
| 93 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 94 | .de BB
|
|---|
| 95 | .if t \{\
|
|---|
| 96 | .sp -.5
|
|---|
| 97 | .br
|
|---|
| 98 | .in +2n
|
|---|
| 99 | .ll -2n
|
|---|
| 100 | .gcolor red
|
|---|
| 101 | .di BX
|
|---|
| 102 | .\}
|
|---|
| 103 | ..
|
|---|
| 104 | .de EB
|
|---|
| 105 | .if t \{\
|
|---|
| 106 | .if "\\$2"adjust-for-leading-newline" \{\
|
|---|
| 107 | .sp -1
|
|---|
| 108 | .\}
|
|---|
| 109 | .br
|
|---|
| 110 | .di
|
|---|
| 111 | .in
|
|---|
| 112 | .ll
|
|---|
| 113 | .gcolor
|
|---|
| 114 | .nr BW \\n(.lu-\\n(.i
|
|---|
| 115 | .nr BH \\n(dn+.5v
|
|---|
| 116 | .ne \\n(BHu+.5v
|
|---|
| 117 | .ie "\\$2"adjust-for-leading-newline" \{\
|
|---|
| 118 | \M[\\$1]\h'1n'\v'+.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[]
|
|---|
| 119 | .\}
|
|---|
| 120 | .el \{\
|
|---|
| 121 | \M[\\$1]\h'1n'\v'-.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[]
|
|---|
| 122 | .\}
|
|---|
| 123 | .in 0
|
|---|
| 124 | .sp -.5v
|
|---|
| 125 | .nf
|
|---|
| 126 | .BX
|
|---|
| 127 | .in
|
|---|
| 128 | .sp .5v
|
|---|
| 129 | .fi
|
|---|
| 130 | .\}
|
|---|
| 131 | ..
|
|---|
| 132 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 133 | .\" BM/EM - put colored marker in margin next to block of text
|
|---|
| 134 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|---|
| 135 | .de BM
|
|---|
| 136 | .if t \{\
|
|---|
| 137 | .br
|
|---|
| 138 | .ll -2n
|
|---|
| 139 | .gcolor red
|
|---|
| 140 | .di BX
|
|---|
| 141 | .\}
|
|---|
| 142 | ..
|
|---|
| 143 | .de EM
|
|---|
| 144 | .if t \{\
|
|---|
| 145 | .br
|
|---|
| 146 | .di
|
|---|
| 147 | .ll
|
|---|
| 148 | .gcolor
|
|---|
| 149 | .nr BH \\n(dn
|
|---|
| 150 | .ne \\n(BHu
|
|---|
| 151 | \M[\\$1]\D'P -.75n 0 0 \\n(BHu -(\\n[.i]u - \\n(INu - .75n) 0 0 -\\n(BHu'\M[]
|
|---|
| 152 | .in 0
|
|---|
| 153 | .nf
|
|---|
| 154 | .BX
|
|---|
| 155 | .in
|
|---|
| 156 | .fi
|
|---|
| 157 | .\}
|
|---|
| 158 | ..
|
|---|
| 159 | .\" -----------------------------------------------------------------
|
|---|
| 160 | .\" * set default formatting
|
|---|
| 161 | .\" -----------------------------------------------------------------
|
|---|
| 162 | .\" disable hyphenation
|
|---|
| 163 | .nh
|
|---|
| 164 | .\" disable justification (adjust text to left margin only)
|
|---|
| 165 | .ad l
|
|---|
| 166 | .\" -----------------------------------------------------------------
|
|---|
| 167 | .\" * MAIN CONTENT STARTS HERE *
|
|---|
| 168 | .\" -----------------------------------------------------------------
|
|---|
| 169 | .SH "Name"
|
|---|
| 170 | cifs.upcall \- Userspace upcall helper for Common Internet File System (CIFS)
|
|---|
| 171 | .SH "Synopsis"
|
|---|
| 172 | .fam C
|
|---|
| 173 | .HP \w'\ 'u
|
|---|
| 174 | \FCcifs\&.upcall\F[] [\-\-trust\-dns|\-t] [\-\-version|\-v] {keyid}
|
|---|
| 175 | .fam
|
|---|
| 176 | .SH "DESCRIPTION"
|
|---|
| 177 | .PP
|
|---|
| 178 | This tool is part of the
|
|---|
| 179 | \fBsamba\fR(7)
|
|---|
| 180 | suite\&.
|
|---|
| 181 | .PP
|
|---|
| 182 | 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\&.
|
|---|
| 183 | .PP
|
|---|
| 184 | cifs\&.upcall is generally intended to be run when the kernel calls request\-key(8)
|
|---|
| 185 | 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\&.
|
|---|
| 186 | .SH "OPTIONS"
|
|---|
| 187 | .PP
|
|---|
| 188 | \-c
|
|---|
| 189 | .RS 4
|
|---|
| 190 | This option is deprecated and is currently ignored\&.
|
|---|
| 191 | .RE
|
|---|
| 192 | .PP
|
|---|
| 193 | \-\-trust\-dns|\-t
|
|---|
| 194 | .RS 4
|
|---|
| 195 | 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\&.
|
|---|
| 196 | .sp
|
|---|
| 197 | 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\&.
|
|---|
| 198 | .RE
|
|---|
| 199 | .PP
|
|---|
| 200 | \-\-version|\-v
|
|---|
| 201 | .RS 4
|
|---|
| 202 | Print version number and exit\&.
|
|---|
| 203 | .RE
|
|---|
| 204 | .SH "CONFIGURATION FOR KEYCTL"
|
|---|
| 205 | .PP
|
|---|
| 206 | 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:
|
|---|
| 207 | .PP
|
|---|
| 208 | cifs\&.spnego
|
|---|
| 209 | .RS 4
|
|---|
| 210 | This keytype is for retrieving kerberos session keys
|
|---|
| 211 | .RE
|
|---|
| 212 | .PP
|
|---|
| 213 | dns_resolver
|
|---|
| 214 | .RS 4
|
|---|
| 215 | This key type is for resolving hostnames into IP addresses
|
|---|
| 216 | .RE
|
|---|
| 217 | .PP
|
|---|
| 218 | 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:
|
|---|
| 219 | .sp
|
|---|
| 220 | .if n \{\
|
|---|
| 221 | .RS 4
|
|---|
| 222 | .\}
|
|---|
| 223 | .fam C
|
|---|
| 224 | .ps -1
|
|---|
| 225 | .nf
|
|---|
| 226 | .if t \{\
|
|---|
| 227 | .sp -1
|
|---|
| 228 | .\}
|
|---|
| 229 | .BB lightgray adjust-for-leading-newline
|
|---|
| 230 | .sp -1
|
|---|
| 231 |
|
|---|
| 232 | #OPERATION TYPE D C PROGRAM ARG1 ARG2\&.\&.\&.
|
|---|
| 233 | #========= ============= = = ================================
|
|---|
| 234 | create cifs\&.spnego * * /usr/local/sbin/cifs\&.upcall %k
|
|---|
| 235 | create dns_resolver * * /usr/local/sbin/cifs\&.upcall %k
|
|---|
| 236 | .EB lightgray adjust-for-leading-newline
|
|---|
| 237 | .if t \{\
|
|---|
| 238 | .sp 1
|
|---|
| 239 | .\}
|
|---|
| 240 | .fi
|
|---|
| 241 | .fam
|
|---|
| 242 | .ps +1
|
|---|
| 243 | .if n \{\
|
|---|
| 244 | .RE
|
|---|
| 245 | .\}
|
|---|
| 246 | .PP
|
|---|
| 247 | See
|
|---|
| 248 | \fBrequest-key.conf5\fR()
|
|---|
| 249 | for more info on each field\&.
|
|---|
| 250 | .SH "SEE ALSO"
|
|---|
| 251 | .PP
|
|---|
| 252 |
|
|---|
| 253 | \fBrequest-key.conf\fR(5),
|
|---|
| 254 | \fBmount.cifs\fR(8)
|
|---|
| 255 | .SH "AUTHOR"
|
|---|
| 256 | .PP
|
|---|
| 257 | Igor Mammedov wrote the cifs\&.upcall program\&.
|
|---|
| 258 | .PP
|
|---|
| 259 | Jeff Layton authored this manpage\&.
|
|---|
| 260 | .PP
|
|---|
| 261 | The maintainer of the Linux CIFS VFS is Steve French\&.
|
|---|
| 262 | .PP
|
|---|
| 263 | The
|
|---|
| 264 | Linux CIFS Mailing list
|
|---|
| 265 | is the preferred place to ask questions regarding these programs\&.
|
|---|
