a257cdd0e2
This adds functions for encoding and decoding POSIX ACLs for the NFSACL protocol extension, and the GETACL and SETACL RPCs. The implementation is compatible with NFSACL in Solaris. Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Olaf Kirch <okir@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
337 lines
8.1 KiB
C
337 lines
8.1 KiB
C
/*
|
|
* linux/fs/nfsd/nfsacl.c
|
|
*
|
|
* Process version 2 NFSACL requests.
|
|
*
|
|
* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
|
|
*/
|
|
|
|
#include <linux/sunrpc/svc.h>
|
|
#include <linux/nfs.h>
|
|
#include <linux/nfsd/nfsd.h>
|
|
#include <linux/nfsd/cache.h>
|
|
#include <linux/nfsd/xdr.h>
|
|
#include <linux/nfsd/xdr3.h>
|
|
#include <linux/posix_acl.h>
|
|
#include <linux/nfsacl.h>
|
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_PROC
|
|
#define RETURN_STATUS(st) { resp->status = (st); return (st); }
|
|
|
|
/*
|
|
* NULL call.
|
|
*/
|
|
static int
|
|
nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
|
|
{
|
|
return nfs_ok;
|
|
}
|
|
|
|
/*
|
|
* Get the Access and/or Default ACL of a file.
|
|
*/
|
|
static int nfsacld_proc_getacl(struct svc_rqst * rqstp,
|
|
struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
|
|
{
|
|
svc_fh *fh;
|
|
struct posix_acl *acl;
|
|
int nfserr = 0;
|
|
|
|
dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh = fh_copy(&resp->fh, &argp->fh);
|
|
if ((nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP)))
|
|
RETURN_STATUS(nfserr_inval);
|
|
|
|
if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
|
|
RETURN_STATUS(nfserr_inval);
|
|
resp->mask = argp->mask;
|
|
|
|
if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
|
|
acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
|
|
if (IS_ERR(acl)) {
|
|
int err = PTR_ERR(acl);
|
|
|
|
if (err == -ENODATA || err == -EOPNOTSUPP)
|
|
acl = NULL;
|
|
else {
|
|
nfserr = nfserrno(err);
|
|
goto fail;
|
|
}
|
|
}
|
|
if (acl == NULL) {
|
|
/* Solaris returns the inode's minimum ACL. */
|
|
|
|
struct inode *inode = fh->fh_dentry->d_inode;
|
|
acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
|
|
}
|
|
resp->acl_access = acl;
|
|
}
|
|
if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
|
|
/* Check how Solaris handles requests for the Default ACL
|
|
of a non-directory! */
|
|
|
|
acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
|
|
if (IS_ERR(acl)) {
|
|
int err = PTR_ERR(acl);
|
|
|
|
if (err == -ENODATA || err == -EOPNOTSUPP)
|
|
acl = NULL;
|
|
else {
|
|
nfserr = nfserrno(err);
|
|
goto fail;
|
|
}
|
|
}
|
|
resp->acl_default = acl;
|
|
}
|
|
|
|
/* resp->acl_{access,default} are released in nfssvc_release_getacl. */
|
|
RETURN_STATUS(0);
|
|
|
|
fail:
|
|
posix_acl_release(resp->acl_access);
|
|
posix_acl_release(resp->acl_default);
|
|
RETURN_STATUS(nfserr);
|
|
}
|
|
|
|
/*
|
|
* Set the Access and/or Default ACL of a file.
|
|
*/
|
|
static int nfsacld_proc_setacl(struct svc_rqst * rqstp,
|
|
struct nfsd3_setaclargs *argp,
|
|
struct nfsd_attrstat *resp)
|
|
{
|
|
svc_fh *fh;
|
|
int nfserr = 0;
|
|
|
|
dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh = fh_copy(&resp->fh, &argp->fh);
|
|
nfserr = fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
|
|
|
|
if (!nfserr) {
|
|
nfserr = nfserrno( nfsd_set_posix_acl(
|
|
fh, ACL_TYPE_ACCESS, argp->acl_access) );
|
|
}
|
|
if (!nfserr) {
|
|
nfserr = nfserrno( nfsd_set_posix_acl(
|
|
fh, ACL_TYPE_DEFAULT, argp->acl_default) );
|
|
}
|
|
|
|
/* argp->acl_{access,default} may have been allocated in
|
|
nfssvc_decode_setaclargs. */
|
|
posix_acl_release(argp->acl_access);
|
|
posix_acl_release(argp->acl_default);
|
|
return nfserr;
|
|
}
|
|
|
|
/*
|
|
* Check file attributes
|
|
*/
|
|
static int nfsacld_proc_getattr(struct svc_rqst * rqstp,
|
|
struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
|
|
{
|
|
dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh));
|
|
|
|
fh_copy(&resp->fh, &argp->fh);
|
|
return fh_verify(rqstp, &resp->fh, 0, MAY_NOP);
|
|
}
|
|
|
|
/*
|
|
* Check file access
|
|
*/
|
|
static int nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
|
|
struct nfsd3_accessres *resp)
|
|
{
|
|
int nfserr;
|
|
|
|
dprintk("nfsd: ACCESS(2acl) %s 0x%x\n",
|
|
SVCFH_fmt(&argp->fh),
|
|
argp->access);
|
|
|
|
fh_copy(&resp->fh, &argp->fh);
|
|
resp->access = argp->access;
|
|
nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
|
|
return nfserr;
|
|
}
|
|
|
|
/*
|
|
* XDR decode functions
|
|
*/
|
|
static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_getaclargs *argp)
|
|
{
|
|
if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
|
|
return 0;
|
|
argp->mask = ntohl(*p); p++;
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
|
|
static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_setaclargs *argp)
|
|
{
|
|
struct kvec *head = rqstp->rq_arg.head;
|
|
unsigned int base;
|
|
int n;
|
|
|
|
if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
|
|
return 0;
|
|
argp->mask = ntohl(*p++);
|
|
if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
|
|
!xdr_argsize_check(rqstp, p))
|
|
return 0;
|
|
|
|
base = (char *)p - (char *)head->iov_base;
|
|
n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
|
|
(argp->mask & NFS_ACL) ?
|
|
&argp->acl_access : NULL);
|
|
if (n > 0)
|
|
n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
|
|
(argp->mask & NFS_DFACL) ?
|
|
&argp->acl_default : NULL);
|
|
return (n > 0);
|
|
}
|
|
|
|
static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd_fhandle *argp)
|
|
{
|
|
if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
|
|
return 0;
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_accessargs *argp)
|
|
{
|
|
if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
|
|
return 0;
|
|
argp->access = ntohl(*p++);
|
|
|
|
return xdr_argsize_check(rqstp, p);
|
|
}
|
|
|
|
/*
|
|
* XDR encode functions
|
|
*/
|
|
|
|
/* GETACL */
|
|
static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_getaclres *resp)
|
|
{
|
|
struct dentry *dentry = resp->fh.fh_dentry;
|
|
struct inode *inode = dentry->d_inode;
|
|
int w = nfsacl_size(
|
|
(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
|
|
(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
|
|
struct kvec *head = rqstp->rq_res.head;
|
|
unsigned int base;
|
|
int n;
|
|
|
|
if (dentry == NULL || dentry->d_inode == NULL)
|
|
return 0;
|
|
inode = dentry->d_inode;
|
|
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
|
|
*p++ = htonl(resp->mask);
|
|
if (!xdr_ressize_check(rqstp, p))
|
|
return 0;
|
|
base = (char *)p - (char *)head->iov_base;
|
|
|
|
rqstp->rq_res.page_len = w;
|
|
while (w > 0) {
|
|
if (!svc_take_res_page(rqstp))
|
|
return 0;
|
|
w -= PAGE_SIZE;
|
|
}
|
|
|
|
n = nfsacl_encode(&rqstp->rq_res, base, inode,
|
|
resp->acl_access,
|
|
resp->mask & NFS_ACL, 0);
|
|
if (n > 0)
|
|
n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
|
|
resp->acl_default,
|
|
resp->mask & NFS_DFACL,
|
|
NFS_ACL_DEFAULT);
|
|
if (n <= 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd_attrstat *resp)
|
|
{
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/* ACCESS */
|
|
static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_accessres *resp)
|
|
{
|
|
p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
|
|
*p++ = htonl(resp->access);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
/*
|
|
* XDR release functions
|
|
*/
|
|
static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd3_getaclres *resp)
|
|
{
|
|
fh_put(&resp->fh);
|
|
posix_acl_release(resp->acl_access);
|
|
posix_acl_release(resp->acl_default);
|
|
return 1;
|
|
}
|
|
|
|
static int nfsaclsvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
|
|
struct nfsd_fhandle *resp)
|
|
{
|
|
fh_put(&resp->fh);
|
|
return 1;
|
|
}
|
|
|
|
#define nfsaclsvc_decode_voidargs NULL
|
|
#define nfsaclsvc_encode_voidres NULL
|
|
#define nfsaclsvc_release_void NULL
|
|
#define nfsd3_fhandleargs nfsd_fhandle
|
|
#define nfsd3_attrstatres nfsd_attrstat
|
|
#define nfsd3_voidres nfsd3_voidargs
|
|
struct nfsd3_voidargs { int dummy; };
|
|
|
|
#define PROC(name, argt, rest, relt, cache, respsize) \
|
|
{ (svc_procfunc) nfsacld_proc_##name, \
|
|
(kxdrproc_t) nfsaclsvc_decode_##argt##args, \
|
|
(kxdrproc_t) nfsaclsvc_encode_##rest##res, \
|
|
(kxdrproc_t) nfsaclsvc_release_##relt, \
|
|
sizeof(struct nfsd3_##argt##args), \
|
|
sizeof(struct nfsd3_##rest##res), \
|
|
0, \
|
|
cache, \
|
|
respsize, \
|
|
}
|
|
|
|
#define ST 1 /* status*/
|
|
#define AT 21 /* attributes */
|
|
#define pAT (1+AT) /* post attributes - conditional */
|
|
#define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */
|
|
|
|
static struct svc_procedure nfsd_acl_procedures2[] = {
|
|
PROC(null, void, void, void, RC_NOCACHE, ST),
|
|
PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
|
|
PROC(setacl, setacl, attrstat, fhandle, RC_NOCACHE, ST+AT),
|
|
PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT),
|
|
PROC(access, access, access, fhandle, RC_NOCACHE, ST+AT+1),
|
|
};
|
|
|
|
struct svc_version nfsd_acl_version2 = {
|
|
.vs_vers = 2,
|
|
.vs_nproc = 5,
|
|
.vs_proc = nfsd_acl_procedures2,
|
|
.vs_dispatch = nfsd_dispatch,
|
|
.vs_xdrsize = NFS3_SVC_XDRSIZE,
|
|
};
|