239 lines
6.5 KiB
Groff
239 lines
6.5 KiB
Groff
|
.\" Copyright (c) 1989, 1991, 1993
|
||
|
|
.\" The Regents of the University of California. All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" Redistribution and use in source and binary forms, with or without
|
||
|
|
.\" modification, are permitted provided that the following conditions
|
||
|
|
.\" are met:
|
||
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer.
|
||
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
||
|
|
.\" documentation and/or other materials provided with the distribution.
|
||
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
||
|
|
.\" must display the following acknowledgement:
|
||
|
|
.\" This product includes software developed by the University of
|
||
|
|
.\" California, Berkeley and its contributors.
|
||
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
||
|
|
.\" may be used to endorse or promote products derived from this software
|
||
|
|
.\" without specific prior written permission.
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
.\" SUCH DAMAGE.
|
||
|
|
.\"
|
||
|
|
.\" @(#)nfssvc.2 8.1 (Berkeley) 6/9/93
|
||
|
|
.\"
|
||
|
|
.Dd June 9, 1993
|
||
|
|
.Dt NFSSVC 2
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm nfssvc
|
||
|
|
.Nd NFS services
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Fd #include <unistd.h>
|
||
|
|
.Fd #include <nfs/nfs.h>
|
||
|
|
.Ft int
|
||
|
|
.Fn nfssvc "int flags" "void *argstructp"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Fn nfssvc
|
||
|
|
function is used by the NFS daemons to pass information into and out
|
||
|
|
of the kernel and also to enter the kernel as a server daemon.
|
||
|
|
The
|
||
|
|
.Fa flags
|
||
|
|
argument consists of several bits that show what action is to be taken
|
||
|
|
once in the kernel and the
|
||
|
|
.Fa argstructp
|
||
|
|
points to one of three structures depending on which bits are set in
|
||
|
|
flags.
|
||
|
|
.Pp
|
||
|
|
On the client side,
|
||
|
|
.Xr nfsiod 8
|
||
|
|
calls
|
||
|
|
.Fn nfssvc
|
||
|
|
with the
|
||
|
|
.Fa flags
|
||
|
|
argument set to
|
||
|
|
.Dv NFSSVC_BIOD
|
||
|
|
and
|
||
|
|
.Fa argstructp
|
||
|
|
set to
|
||
|
|
.Dv NULL
|
||
|
|
to enter the kernel as a block I/O server daemon.
|
||
|
|
For
|
||
|
|
.Nm NQNFS ,
|
||
|
|
.Xr mount_nfs 8
|
||
|
|
calls
|
||
|
|
.Fn nfssvc
|
||
|
|
with the
|
||
|
|
.Dv NFSSVC_MNTD
|
||
|
|
flag, optionally or'd with the flags
|
||
|
|
.Dv NFSSVC_GOTAUTH
|
||
|
|
and
|
||
|
|
.Dv NFSSVC_AUTHINFAIL
|
||
|
|
along with a pointer to a
|
||
|
|
.Bd -literal
|
||
|
|
struct nfsd_cargs {
|
||
|
|
char *ncd_dirp; /* Mount dir path */
|
||
|
|
uid_t ncd_authuid; /* Effective uid */
|
||
|
|
int ncd_authtype; /* Type of authenticator */
|
||
|
|
int ncd_authlen; /* Length of authenticator string */
|
||
|
|
char *ncd_authstr; /* Authenticator string */
|
||
|
|
};
|
||
|
|
.Ed
|
||
|
|
.sp
|
||
|
|
structure.
|
||
|
|
The initial call has only the
|
||
|
|
.Dv NFSSVC_MNTD
|
||
|
|
flag set to specify service for the mount point.
|
||
|
|
If the mount point is using Kerberos, then the
|
||
|
|
.Xr mount_nfs 8
|
||
|
|
daemon will return from
|
||
|
|
.Fn nfssvc
|
||
|
|
with errno == ENEEDAUTH whenever the client side requires an ``rcmd''
|
||
|
|
authentication ticket for the user.
|
||
|
|
.Xr Mount_nfs 8
|
||
|
|
will attempt to get the Kerberos ticket, and if successful will call
|
||
|
|
.Fn nfssvc
|
||
|
|
with the flags
|
||
|
|
.Dv NFSSVC_MNTD
|
||
|
|
and
|
||
|
|
.Dv NFSSVC_GOTAUTH
|
||
|
|
after filling the ticket into the
|
||
|
|
ncd_authstr field
|
||
|
|
and
|
||
|
|
setting the ncd_authlen and ncd_authtype
|
||
|
|
fields of the nfsd_cargs structure.
|
||
|
|
If
|
||
|
|
.Xr mount_nfs 8
|
||
|
|
failed to get the ticket,
|
||
|
|
.Fn nfssvc
|
||
|
|
will be called with the flags
|
||
|
|
.Dv NFSSVC_MNTD ,
|
||
|
|
.Dv NFSSVC_GOTAUTH
|
||
|
|
and
|
||
|
|
.Dv NFSSVC_AUTHINFAIL
|
||
|
|
to denote a failed authentication attempt.
|
||
|
|
.Pp
|
||
|
|
On the server side,
|
||
|
|
.Fn nfssvc
|
||
|
|
is called with the flag
|
||
|
|
.Dv NFSSVC_NFSD
|
||
|
|
and a pointer to a
|
||
|
|
.Bd -literal
|
||
|
|
struct nfsd_srvargs {
|
||
|
|
struct nfsd *nsd_nfsd; /* Pointer to in kernel nfsd struct */
|
||
|
|
uid_t nsd_uid; /* Effective uid mapped to cred */
|
||
|
|
u_long nsd_haddr; /* Ip address of client */
|
||
|
|
struct ucred nsd_cr; /* Cred. uid maps to */
|
||
|
|
int nsd_authlen; /* Length of auth string (ret) */
|
||
|
|
char *nsd_authstr; /* Auth string (ret) */
|
||
|
|
};
|
||
|
|
.Ed
|
||
|
|
.sp
|
||
|
|
to enter the kernel as an
|
||
|
|
.Xr nfsd 8
|
||
|
|
daemon.
|
||
|
|
Whenever an
|
||
|
|
.Xr nfsd 8
|
||
|
|
daemon receives a Kerberos authentication ticket, it will return from
|
||
|
|
.Fn nfssvc
|
||
|
|
with errno == ENEEDAUTH.
|
||
|
|
The
|
||
|
|
.Xr nfsd 8
|
||
|
|
will attempt to authenticate the ticket and generate a set of credentials
|
||
|
|
on the server for the ``user id'' specified in the field nsd_uid.
|
||
|
|
This is done by first authenticating the Kerberos ticket and then mapping
|
||
|
|
the Kerberos principal to a local name and getting a set of credentials for
|
||
|
|
that user via.
|
||
|
|
.Xr getpwnam 3
|
||
|
|
and
|
||
|
|
.Xr getgrouplist 3 .
|
||
|
|
If successful, the
|
||
|
|
.Xr nfsd 8
|
||
|
|
will call
|
||
|
|
.Fn nfssvc
|
||
|
|
with the
|
||
|
|
.Dv NFSSVC_NFSD
|
||
|
|
and
|
||
|
|
.Dv NFSSVC_AUTHIN
|
||
|
|
flags set to pass the credential mapping in nsd_cr into the
|
||
|
|
kernel to be cached on the server socket for that client.
|
||
|
|
If the authentication failed,
|
||
|
|
.Xr nfsd 8
|
||
|
|
calls
|
||
|
|
.Fn nfssvc
|
||
|
|
with the flags
|
||
|
|
.Dv NFSSVC_NFSD
|
||
|
|
and
|
||
|
|
.Dv NFSSVC_AUTHINFAIL
|
||
|
|
to denote an authentication failure.
|
||
|
|
.Pp
|
||
|
|
The master
|
||
|
|
.Xr nfsd 8
|
||
|
|
server daemon calls
|
||
|
|
.Fn nfssvc
|
||
|
|
with the flag
|
||
|
|
.Dv NFSSVC_ADDSOCK
|
||
|
|
and a pointer to a
|
||
|
|
.Bd -literal
|
||
|
|
struct nfsd_args {
|
||
|
|
int sock; /* Socket to serve */
|
||
|
|
caddr_t name; /* Client address for connection based sockets */
|
||
|
|
int namelen; /* Length of name */
|
||
|
|
};
|
||
|
|
.Ed
|
||
|
|
.sp
|
||
|
|
to pass a server side
|
||
|
|
.Tn NFS
|
||
|
|
socket into the kernel for servicing by the
|
||
|
|
.Xr nfsd 8
|
||
|
|
daemons.
|
||
|
|
.Sh RETURN VALUES
|
||
|
|
Normally
|
||
|
|
.Nm nfssvc
|
||
|
|
does not return unless the server
|
||
|
|
is terminated by a signal when a value of 0 is returned.
|
||
|
|
Otherwise, -1 is returned and the global variable
|
||
|
|
.Va errno
|
||
|
|
is set to specify the error.
|
||
|
|
.Sh ERRORS
|
||
|
|
.Bl -tag -width [ENEEDAUTH]
|
||
|
|
.It Bq Er ENEEDAUTH
|
||
|
|
This special error value
|
||
|
|
is really used for authentication support, particularly Kerberos,
|
||
|
|
as explained above.
|
||
|
|
.It Bq Er EPERM
|
||
|
|
The caller is not the super-user.
|
||
|
|
.El
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr nfsd 8 ,
|
||
|
|
.Xr mount_nfs 8 ,
|
||
|
|
.Xr nfsiod 8
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Nm nfssvc
|
||
|
|
function first appeared in 4.4BSD.
|
||
|
|
.Sh BUGS
|
||
|
|
The
|
||
|
|
.Nm nfssvc
|
||
|
|
system call is designed specifically for the
|
||
|
|
.Tn NFS
|
||
|
|
support daemons and as such is specific to their requirements.
|
||
|
|
It should really return values to indicate the need for authentication
|
||
|
|
support, since
|
||
|
|
.Dv ENEEDAUTH
|
||
|
|
is not really an error.
|
||
|
|
Several fields of the argument structures are assumed to be valid and
|
||
|
|
sometimes to be unchanged from a previous call, such that
|
||
|
|
.Nm nfssvc
|
||
|
|
must be used with extreme care.
|