[mirror_ubuntu-bionic-kernel.git] / fs / nfsd / nfs3acl.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Process version 3 NFSACL requests.
 *
 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
 */

#include "nfsd.h"
/* FIXME: nfsacl.h is a broken header */
#include <linux/nfsacl.h>
#include <linux/gfp.h>
#include "cache.h"
#include "xdr3.h"
#include "vfs.h"

#define RETURN_STATUS(st)	{ resp->status = (st); return (st); }

/*
 * NULL call.
 */
static __be32
nfsd3_proc_null(struct svc_rqst *rqstp)
{
	return nfs_ok;
}

/*
 * Get the Access and/or Default ACL of a file.
 */
static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
{
	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
	struct nfsd3_getaclres *resp = rqstp->rq_resp;
	struct posix_acl *acl;
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	if (nfserr)
		RETURN_STATUS(nfserr);

	inode = d_inode(fh->fh_dentry);

	if (argp->mask & ~NFS_ACL_MASK)
		RETURN_STATUS(nfserr_inval);
	resp->mask = argp->mask;

	if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
		acl = get_acl(inode, ACL_TYPE_ACCESS);
		if (acl == NULL) {
			/* Solaris returns the inode's minimum ACL. */
			acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
		}
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		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 = get_acl(inode, ACL_TYPE_DEFAULT);
		if (IS_ERR(acl)) {
			nfserr = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		resp->acl_default = acl;
	}

	/* resp->acl_{access,default} are released in nfs3svc_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 __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
{
	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
	struct nfsd3_attrstat *resp = rqstp->rq_resp;
	struct inode *inode;
	svc_fh *fh;
	__be32 nfserr = 0;
	int error;

	fh = fh_copy(&resp->fh, &argp->fh);
	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
	if (nfserr)
		goto out;

	inode = d_inode(fh->fh_dentry);

	error = fh_want_write(fh);
	if (error)
		goto out_errno;

	fh_lock(fh);

	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
	if (error)
		goto out_drop_lock;
	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);

out_drop_lock:
	fh_unlock(fh);
	fh_drop_write(fh);
out_errno:
	nfserr = nfserrno(error);
out:
	/* argp->acl_{access,default} may have been allocated in
	   nfs3svc_decode_setaclargs. */
	posix_acl_release(argp->acl_access);
	posix_acl_release(argp->acl_default);
	RETURN_STATUS(nfserr);
}

/*
 * XDR decode functions
 */
static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_getaclargs *args = rqstp->rq_argp;

	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->mask = ntohl(*p); p++;

	return xdr_argsize_check(rqstp, p);
}


static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_setaclargs *args = rqstp->rq_argp;
	struct kvec *head = rqstp->rq_arg.head;
	unsigned int base;
	int n;

	p = nfs3svc_decode_fh(p, &args->fh);
	if (!p)
		return 0;
	args->mask = ntohl(*p++);
	if (args->mask & ~NFS_ACL_MASK ||
	    !xdr_argsize_check(rqstp, p))
		return 0;

	base = (char *)p - (char *)head->iov_base;
	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
			  (args->mask & NFS_ACL) ?
			  &args->acl_access : NULL);
	if (n > 0)
		n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
				  (args->mask & NFS_DFACL) ?
				  &args->acl_default : NULL);
	return (n > 0);
}

/*
 * XDR encode functions
 */

/* GETACL */
static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_getaclres *resp = rqstp->rq_resp;
	struct dentry *dentry = resp->fh.fh_dentry;

	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
		struct inode *inode = d_inode(dentry);
		struct kvec *head = rqstp->rq_res.head;
		unsigned int base;
		int n;
		int w;

		*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 = nfsacl_size(
			(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
			(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
		while (w > 0) {
			if (!*(rqstp->rq_next_page++))
				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;
	} else
		if (!xdr_ressize_check(rqstp, p))
			return 0;

	return 1;
}

/* SETACL */
static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p)
{
	struct nfsd3_attrstat *resp = rqstp->rq_resp;

	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);

	return xdr_ressize_check(rqstp, p);
}

/*
 * XDR release functions
 */
static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
{
	struct nfsd3_getaclres *resp = rqstp->rq_resp;

	fh_put(&resp->fh);
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
}

#define nfs3svc_decode_voidargs		NULL
#define nfs3svc_release_void		NULL
#define nfsd3_setaclres			nfsd3_attrstat
#define nfsd3_voidres			nfsd3_voidargs
struct nfsd3_voidargs { int dummy; };

#define PROC(name, argt, rest, relt, cache, respsize)			\
{									\
	.pc_func	= nfsd3_proc_##name,				\
	.pc_decode	= nfs3svc_decode_##argt##args,			\
	.pc_encode	= nfs3svc_encode_##rest##res,			\
	.pc_release	= nfs3svc_release_##relt,			\
	.pc_argsize	= sizeof(struct nfsd3_##argt##args),		\
	.pc_ressize	= sizeof(struct nfsd3_##rest##res),		\
	.pc_cachetype	= cache,					\
	.pc_xdrressize	= 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 const struct svc_procedure nfsd_acl_procedures3[] = {
  PROC(null,	void,		void,		void,	  RC_NOCACHE, ST),
  PROC(getacl,	getacl,		getacl,		getacl,	  RC_NOCACHE, ST+1+2*(1+ACL)),
  PROC(setacl,	setacl,		setacl,		fhandle,  RC_NOCACHE, ST+pAT),
};

static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
const struct svc_version nfsd_acl_version3 = {
	.vs_vers	= 3,
	.vs_nproc	= 3,
	.vs_proc	= nfsd_acl_procedures3,
	.vs_count	= nfsd_acl_count3,
	.vs_dispatch	= nfsd_dispatch,
	.vs_xdrsize	= NFS3_SVC_XDRSIZE,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
a257cdd0	2	/*
a257cdd0 AG	3	* Process version 3 NFSACL requests.
	4	*
	5	* Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
	6	*/
	7
9a74af21 BH	8	#include "nfsd.h"
9a74af21 BH	9	/* FIXME: nfsacl.h is a broken header */
a257cdd0	10	#include <linux/nfsacl.h>
5a0e3ad6	11	#include <linux/gfp.h>
9a74af21 BH	12	#include "cache.h"
9a74af21 BH	13	#include "xdr3.h"
0a3adade	14	#include "vfs.h"
a257cdd0 AG	15
	16	#define RETURN_STATUS(st) { resp->status = (st); return (st); }
	17
	18	/*
	19	* NULL call.
	20	*/
7111c66e	21	static __be32
a6beb732	22	nfsd3_proc_null(struct svc_rqst *rqstp)
a257cdd0 AG	23	{
	24	return nfs_ok;
	25	}
	26
	27	/*
	28	* Get the Access and/or Default ACL of a file.
	29	*/
a6beb732	30	static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
a257cdd0	31	{
a6beb732 CH	32	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
a6beb732 CH	33	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0	34	struct posix_acl *acl;
4ac7249e CH	35	struct inode *inode;
4ac7249e CH	36	svc_fh *fh;
c4d987ba	37	__be32 nfserr = 0;
a257cdd0 AG	38
a257cdd0 AG	39	fh = fh_copy(&resp->fh, &argp->fh);
8837abca MS	40	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
8837abca MS	41	if (nfserr)
ac8587dc	42	RETURN_STATUS(nfserr);
a257cdd0	43
2b0143b5	44	inode = d_inode(fh->fh_dentry);
4ac7249e	45
7b8f4586	46	if (argp->mask & ~NFS_ACL_MASK)
a257cdd0 AG	47	RETURN_STATUS(nfserr_inval);
	48	resp->mask = argp->mask;
	49
	50	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
4ac7249e	51	acl = get_acl(inode, ACL_TYPE_ACCESS);
a257cdd0 AG	52	if (acl == NULL) {
a257cdd0 AG	53	/* Solaris returns the inode's minimum ACL. */
a257cdd0 AG	54	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
a257cdd0 AG	55	}
35e634b8 KM	56	if (IS_ERR(acl)) {
	57	nfserr = nfserrno(PTR_ERR(acl));
	58	goto fail;
	59	}
a257cdd0 AG	60	resp->acl_access = acl;
	61	}
	62	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	63	/* Check how Solaris handles requests for the Default ACL
	64	of a non-directory! */
4ac7249e	65	acl = get_acl(inode, ACL_TYPE_DEFAULT);
a257cdd0	66	if (IS_ERR(acl)) {
4ac7249e CH	67	nfserr = nfserrno(PTR_ERR(acl));
4ac7249e CH	68	goto fail;
a257cdd0 AG	69	}
	70	resp->acl_default = acl;
	71	}
	72
	73	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
	74	RETURN_STATUS(0);
	75
	76	fail:
	77	posix_acl_release(resp->acl_access);
	78	posix_acl_release(resp->acl_default);
	79	RETURN_STATUS(nfserr);
	80	}
	81
	82	/*
	83	* Set the Access and/or Default ACL of a file.
	84	*/
a6beb732	85	static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp)
a257cdd0	86	{
a6beb732 CH	87	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
a6beb732 CH	88	struct nfsd3_attrstat *resp = rqstp->rq_resp;
4ac7249e	89	struct inode *inode;
a257cdd0	90	svc_fh *fh;
c4d987ba	91	__be32 nfserr = 0;
4ac7249e	92	int error;
a257cdd0 AG	93
a257cdd0 AG	94	fh = fh_copy(&resp->fh, &argp->fh);
8837abca	95	nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
4ac7249e CH	96	if (nfserr)
4ac7249e CH	97	goto out;
a257cdd0	98
2b0143b5	99	inode = d_inode(fh->fh_dentry);
a257cdd0	100
4ac7249e CH	101	error = fh_want_write(fh);
	102	if (error)
	103	goto out_errno;
	104
99965378 BH	105	fh_lock(fh);
	106
	107	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
4ac7249e	108	if (error)
99965378 BH	109	goto out_drop_lock;
99965378 BH	110	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
4ac7249e	111
99965378 BH	112	out_drop_lock:
99965378 BH	113	fh_unlock(fh);
4ac7249e CH	114	fh_drop_write(fh);
	115	out_errno:
	116	nfserr = nfserrno(error);
	117	out:
a257cdd0 AG	118	/* argp->acl_{access,default} may have been allocated in
	119	nfs3svc_decode_setaclargs. */
	120	posix_acl_release(argp->acl_access);
	121	posix_acl_release(argp->acl_default);
	122	RETURN_STATUS(nfserr);
	123	}
	124
	125	/*
	126	* XDR decode functions
	127	*/
026fec7e	128	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	129	{
026fec7e CH	130	struct nfsd3_getaclargs *args = rqstp->rq_argp;
026fec7e CH	131
d40aa337 BT	132	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	133	if (!p)
a257cdd0 AG	134	return 0;
	135	args->mask = ntohl(*p); p++;
	136
	137	return xdr_argsize_check(rqstp, p);
	138	}
	139
	140
026fec7e	141	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	142	{
026fec7e	143	struct nfsd3_setaclargs *args = rqstp->rq_argp;
a257cdd0 AG	144	struct kvec *head = rqstp->rq_arg.head;
	145	unsigned int base;
	146	int n;
	147
d40aa337 BT	148	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	149	if (!p)
a257cdd0 AG	150	return 0;
a257cdd0 AG	151	args->mask = ntohl(*p++);
7b8f4586	152	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	153	!xdr_argsize_check(rqstp, p))
	154	return 0;
	155
	156	base = (char )p - (char )head->iov_base;
	157	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	158	(args->mask & NFS_ACL) ?
	159	&args->acl_access : NULL);
	160	if (n > 0)
	161	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	162	(args->mask & NFS_DFACL) ?
	163	&args->acl_default : NULL);
	164	return (n > 0);
	165	}
	166
	167	/*
	168	* XDR encode functions
	169	*/
	170
	171	/* GETACL */
63f8de37	172	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p)
a257cdd0	173	{
63f8de37	174	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0 AG	175	struct dentry *dentry = resp->fh.fh_dentry;
	176
	177	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
2b0143b5 DH	178	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
2b0143b5 DH	179	struct inode *inode = d_inode(dentry);
a257cdd0 AG	180	struct kvec *head = rqstp->rq_res.head;
	181	unsigned int base;
	182	int n;
14d2b59e	183	int w;
a257cdd0 AG	184
	185	*p++ = htonl(resp->mask);
	186	if (!xdr_ressize_check(rqstp, p))
	187	return 0;
	188	base = (char )p - (char )head->iov_base;
	189
14d2b59e JJ	190	rqstp->rq_res.page_len = w = nfsacl_size(
	191	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	192	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	193	while (w > 0) {
afc59400	194	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	195	return 0;
	196	w -= PAGE_SIZE;
	197	}
	198
	199	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	200	resp->acl_access,
	201	resp->mask & NFS_ACL, 0);
	202	if (n > 0)
	203	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	204	resp->acl_default,
	205	resp->mask & NFS_DFACL,
	206	NFS_ACL_DEFAULT);
	207	if (n <= 0)
	208	return 0;
	209	} else
	210	if (!xdr_ressize_check(rqstp, p))
	211	return 0;
	212
	213	return 1;
	214	}
	215
	216	/* SETACL */
63f8de37	217	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p)
a257cdd0	218	{
63f8de37 CH	219	struct nfsd3_attrstat *resp = rqstp->rq_resp;
63f8de37 CH	220
a257cdd0 AG	221	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
	222
	223	return xdr_ressize_check(rqstp, p);
	224	}
	225
	226	/*
	227	* XDR release functions
	228	*/
8537488b	229	static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
a257cdd0	230	{
8537488b CH	231	struct nfsd3_getaclres *resp = rqstp->rq_resp;
8537488b CH	232
a257cdd0 AG	233	fh_put(&resp->fh);
	234	posix_acl_release(resp->acl_access);
	235	posix_acl_release(resp->acl_default);
a257cdd0 AG	236	}
	237
	238	#define nfs3svc_decode_voidargs NULL
	239	#define nfs3svc_release_void NULL
	240	#define nfsd3_setaclres nfsd3_attrstat
	241	#define nfsd3_voidres nfsd3_voidargs
	242	struct nfsd3_voidargs { int dummy; };
	243
f7235b6b CH	244	#define PROC(name, argt, rest, relt, cache, respsize) \
f7235b6b CH	245	{ \
a6beb732	246	.pc_func = nfsd3_proc_##name, \
026fec7e	247	.pc_decode = nfs3svc_decode_##argt##args, \
63f8de37	248	.pc_encode = nfs3svc_encode_##rest##res, \
8537488b	249	.pc_release = nfs3svc_release_##relt, \
f7235b6b CH	250	.pc_argsize = sizeof(struct nfsd3_##argt##args), \
	251	.pc_ressize = sizeof(struct nfsd3_##rest##res), \
	252	.pc_cachetype = cache, \
	253	.pc_xdrressize = respsize, \
	254	}
a257cdd0 AG	255
	256	#define ST 1 /* status*/
	257	#define AT 21 /* attributes */
	258	#define pAT (1+AT) /* post attributes - conditional */
	259	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	260
860bda29	261	static const struct svc_procedure nfsd_acl_procedures3[] = {
a257cdd0 AG	262	PROC(null, void, void, void, RC_NOCACHE, ST),
	263	PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)),
	264	PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT),
	265	};
	266
7fd38af9	267	static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
e9679189 CH	268	const struct svc_version nfsd_acl_version3 = {
	269	.vs_vers = 3,
	270	.vs_nproc = 3,
	271	.vs_proc = nfsd_acl_procedures3,
	272	.vs_count = nfsd_acl_count3,
	273	.vs_dispatch = nfsd_dispatch,
	274	.vs_xdrsize = NFS3_SVC_XDRSIZE,
a257cdd0 AG	275	};
a257cdd0 AG	276