[linux-block.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"

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

/*
 * 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;

	fh = fh_copy(&resp->fh, &argp->fh);
	resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	if (resp->status != nfs_ok)
		goto out;

	inode = d_inode(fh->fh_dentry);

	if (argp->mask & ~NFS_ACL_MASK) {
		resp->status = nfserr_inval;
		goto out;
	}
	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)) {
			resp->status = 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)) {
			resp->status = nfserrno(PTR_ERR(acl));
			goto fail;
		}
		resp->acl_default = acl;
	}

	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
out:
	return rpc_success;

fail:
	posix_acl_release(resp->acl_access);
	posix_acl_release(resp->acl_default);
	goto out;
}

/*
 * 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;
	int error;

	fh = fh_copy(&resp->fh, &argp->fh);
	resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
	if (resp->status != nfs_ok)
		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(&init_user_ns, inode, ACL_TYPE_ACCESS,
			      argp->acl_access);
	if (error)
		goto out_drop_lock;
	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
			      argp->acl_default);

out_drop_lock:
	fh_unlock(fh);
	fh_drop_write(fh);
out_errno:
	resp->status = 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 rpc_success;
}

/*
 * 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++ = resp->status;
	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++ = resp->status;
	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);
}

struct nfsd3_voidargs { int dummy; };

#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[3] = {
	[ACLPROC3_NULL] = {
		.pc_func = nfsd3_proc_null,
		.pc_decode = nfssvc_decode_voidarg,
		.pc_encode = nfssvc_encode_voidres,
		.pc_argsize = sizeof(struct nfsd_voidargs),
		.pc_ressize = sizeof(struct nfsd_voidres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST,
	},
	[ACLPROC3_GETACL] = {
		.pc_func = nfsd3_proc_getacl,
		.pc_decode = nfs3svc_decode_getaclargs,
		.pc_encode = nfs3svc_encode_getaclres,
		.pc_release = nfs3svc_release_getacl,
		.pc_argsize = sizeof(struct nfsd3_getaclargs),
		.pc_ressize = sizeof(struct nfsd3_getaclres),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = ST+1+2*(1+ACL),
	},
	[ACLPROC3_SETACL] = {
		.pc_func = nfsd3_proc_setacl,
		.pc_decode = nfs3svc_decode_setaclargs,
		.pc_encode = nfs3svc_encode_setaclres,
		.pc_release = nfs3svc_release_fhandle,
		.pc_argsize = sizeof(struct nfsd3_setaclargs),
		.pc_ressize = sizeof(struct nfsd3_attrstat),
		.pc_cachetype = RC_NOCACHE,
		.pc_xdrressize = 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	15
a257cdd0 AG	16	/*
	17	* NULL call.
	18	*/
7111c66e	19	static __be32
a6beb732	20	nfsd3_proc_null(struct svc_rqst *rqstp)
a257cdd0	21	{
cc028a10	22	return rpc_success;
a257cdd0 AG	23	}
	24
	25	/*
	26	* Get the Access and/or Default ACL of a file.
	27	*/
a6beb732	28	static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp)
a257cdd0	29	{
a6beb732 CH	30	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
a6beb732 CH	31	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0	32	struct posix_acl *acl;
4ac7249e CH	33	struct inode *inode;
4ac7249e CH	34	svc_fh *fh;
a257cdd0 AG	35
a257cdd0 AG	36	fh = fh_copy(&resp->fh, &argp->fh);
14168d67 CL	37	resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
	38	if (resp->status != nfs_ok)
	39	goto out;
a257cdd0	40
2b0143b5	41	inode = d_inode(fh->fh_dentry);
4ac7249e	42
14168d67 CL	43	if (argp->mask & ~NFS_ACL_MASK) {
	44	resp->status = nfserr_inval;
	45	goto out;
	46	}
a257cdd0 AG	47	resp->mask = argp->mask;
	48
	49	if (resp->mask & (NFS_ACL\|NFS_ACLCNT)) {
4ac7249e	50	acl = get_acl(inode, ACL_TYPE_ACCESS);
a257cdd0 AG	51	if (acl == NULL) {
a257cdd0 AG	52	/* Solaris returns the inode's minimum ACL. */
a257cdd0 AG	53	acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
a257cdd0 AG	54	}
35e634b8	55	if (IS_ERR(acl)) {
14168d67	56	resp->status = nfserrno(PTR_ERR(acl));
35e634b8 KM	57	goto fail;
35e634b8 KM	58	}
a257cdd0 AG	59	resp->acl_access = acl;
	60	}
	61	if (resp->mask & (NFS_DFACL\|NFS_DFACLCNT)) {
	62	/* Check how Solaris handles requests for the Default ACL
	63	of a non-directory! */
4ac7249e	64	acl = get_acl(inode, ACL_TYPE_DEFAULT);
a257cdd0	65	if (IS_ERR(acl)) {
14168d67	66	resp->status = nfserrno(PTR_ERR(acl));
4ac7249e	67	goto fail;
a257cdd0 AG	68	}
	69	resp->acl_default = acl;
	70	}
	71
	72	/* resp->acl_{access,default} are released in nfs3svc_release_getacl. */
14168d67	73	out:
cc028a10	74	return rpc_success;
a257cdd0 AG	75
	76	fail:
	77	posix_acl_release(resp->acl_access);
	78	posix_acl_release(resp->acl_default);
14168d67	79	goto out;
a257cdd0 AG	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;
4ac7249e	91	int error;
a257cdd0 AG	92
a257cdd0 AG	93	fh = fh_copy(&resp->fh, &argp->fh);
14168d67 CL	94	resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
14168d67 CL	95	if (resp->status != nfs_ok)
4ac7249e	96	goto out;
a257cdd0	97
2b0143b5	98	inode = d_inode(fh->fh_dentry);
a257cdd0	99
4ac7249e CH	100	error = fh_want_write(fh);
	101	if (error)
	102	goto out_errno;
	103
99965378 BH	104	fh_lock(fh);
99965378 BH	105
e65ce2a5 CB	106	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS,
e65ce2a5 CB	107	argp->acl_access);
4ac7249e	108	if (error)
99965378	109	goto out_drop_lock;
e65ce2a5 CB	110	error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT,
e65ce2a5 CB	111	argp->acl_default);
4ac7249e	112
99965378 BH	113	out_drop_lock:
99965378 BH	114	fh_unlock(fh);
4ac7249e CH	115	fh_drop_write(fh);
4ac7249e CH	116	out_errno:
14168d67	117	resp->status = nfserrno(error);
4ac7249e	118	out:
a257cdd0 AG	119	/* argp->acl_{access,default} may have been allocated in
	120	nfs3svc_decode_setaclargs. */
	121	posix_acl_release(argp->acl_access);
	122	posix_acl_release(argp->acl_default);
cc028a10	123	return rpc_success;
a257cdd0 AG	124	}
	125
	126	/*
	127	* XDR decode functions
	128	*/
026fec7e	129	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	130	{
026fec7e CH	131	struct nfsd3_getaclargs *args = rqstp->rq_argp;
026fec7e CH	132
d40aa337 BT	133	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	134	if (!p)
a257cdd0 AG	135	return 0;
	136	args->mask = ntohl(*p); p++;
	137
	138	return xdr_argsize_check(rqstp, p);
	139	}
	140
	141
026fec7e	142	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	143	{
026fec7e	144	struct nfsd3_setaclargs *args = rqstp->rq_argp;
a257cdd0 AG	145	struct kvec *head = rqstp->rq_arg.head;
	146	unsigned int base;
	147	int n;
	148
d40aa337 BT	149	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	150	if (!p)
a257cdd0 AG	151	return 0;
a257cdd0 AG	152	args->mask = ntohl(*p++);
7b8f4586	153	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	154	!xdr_argsize_check(rqstp, p))
	155	return 0;
	156
	157	base = (char )p - (char )head->iov_base;
	158	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	159	(args->mask & NFS_ACL) ?
	160	&args->acl_access : NULL);
	161	if (n > 0)
	162	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	163	(args->mask & NFS_DFACL) ?
	164	&args->acl_default : NULL);
	165	return (n > 0);
	166	}
	167
	168	/*
	169	* XDR encode functions
	170	*/
	171
	172	/* GETACL */
63f8de37	173	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p)
a257cdd0	174	{
63f8de37	175	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0 AG	176	struct dentry *dentry = resp->fh.fh_dentry;
a257cdd0 AG	177
cc028a10	178	*p++ = resp->status;
a257cdd0	179	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
2b0143b5 DH	180	if (resp->status == 0 && dentry && d_really_is_positive(dentry)) {
2b0143b5 DH	181	struct inode *inode = d_inode(dentry);
a257cdd0 AG	182	struct kvec *head = rqstp->rq_res.head;
	183	unsigned int base;
	184	int n;
14d2b59e	185	int w;
a257cdd0 AG	186
	187	*p++ = htonl(resp->mask);
	188	if (!xdr_ressize_check(rqstp, p))
	189	return 0;
	190	base = (char )p - (char )head->iov_base;
	191
14d2b59e JJ	192	rqstp->rq_res.page_len = w = nfsacl_size(
	193	(resp->mask & NFS_ACL) ? resp->acl_access : NULL,
	194	(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
a257cdd0	195	while (w > 0) {
afc59400	196	if (!*(rqstp->rq_next_page++))
a257cdd0 AG	197	return 0;
	198	w -= PAGE_SIZE;
	199	}
	200
	201	n = nfsacl_encode(&rqstp->rq_res, base, inode,
	202	resp->acl_access,
	203	resp->mask & NFS_ACL, 0);
	204	if (n > 0)
	205	n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
	206	resp->acl_default,
	207	resp->mask & NFS_DFACL,
	208	NFS_ACL_DEFAULT);
	209	if (n <= 0)
	210	return 0;
	211	} else
	212	if (!xdr_ressize_check(rqstp, p))
	213	return 0;
	214
	215	return 1;
	216	}
	217
	218	/* SETACL */
63f8de37	219	static int nfs3svc_encode_setaclres(struct svc_rqst rqstp, __be32 p)
a257cdd0	220	{
63f8de37 CH	221	struct nfsd3_attrstat *resp = rqstp->rq_resp;
63f8de37 CH	222
cc028a10	223	*p++ = resp->status;
a257cdd0	224	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
a257cdd0 AG	225	return xdr_ressize_check(rqstp, p);
	226	}
	227
	228	/*
	229	* XDR release functions
	230	*/
8537488b	231	static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
a257cdd0	232	{
8537488b CH	233	struct nfsd3_getaclres *resp = rqstp->rq_resp;
8537488b CH	234
a257cdd0 AG	235	fh_put(&resp->fh);
	236	posix_acl_release(resp->acl_access);
	237	posix_acl_release(resp->acl_default);
a257cdd0 AG	238	}
a257cdd0 AG	239
a257cdd0 AG	240	struct nfsd3_voidargs { int dummy; };
a257cdd0 AG	241
a257cdd0 AG	242	#define ST 1 /* status*/
	243	#define AT 21 /* attributes */
	244	#define pAT (1+AT) /* post attributes - conditional */
	245	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	246
ba1df797 CL	247	static const struct svc_procedure nfsd_acl_procedures3[3] = {
	248	[ACLPROC3_NULL] = {
	249	.pc_func = nfsd3_proc_null,
788f7183 CL	250	.pc_decode = nfssvc_decode_voidarg,
	251	.pc_encode = nfssvc_encode_voidres,
	252	.pc_argsize = sizeof(struct nfsd_voidargs),
	253	.pc_ressize = sizeof(struct nfsd_voidres),
ba1df797 CL	254	.pc_cachetype = RC_NOCACHE,
	255	.pc_xdrressize = ST,
	256	},
	257	[ACLPROC3_GETACL] = {
	258	.pc_func = nfsd3_proc_getacl,
	259	.pc_decode = nfs3svc_decode_getaclargs,
	260	.pc_encode = nfs3svc_encode_getaclres,
	261	.pc_release = nfs3svc_release_getacl,
	262	.pc_argsize = sizeof(struct nfsd3_getaclargs),
	263	.pc_ressize = sizeof(struct nfsd3_getaclres),
	264	.pc_cachetype = RC_NOCACHE,
	265	.pc_xdrressize = ST+1+2*(1+ACL),
	266	},
	267	[ACLPROC3_SETACL] = {
	268	.pc_func = nfsd3_proc_setacl,
	269	.pc_decode = nfs3svc_decode_setaclargs,
	270	.pc_encode = nfs3svc_encode_setaclres,
	271	.pc_release = nfs3svc_release_fhandle,
	272	.pc_argsize = sizeof(struct nfsd3_setaclargs),
	273	.pc_ressize = sizeof(struct nfsd3_attrstat),
	274	.pc_cachetype = RC_NOCACHE,
	275	.pc_xdrressize = ST+pAT,
	276	},
a257cdd0 AG	277	};
a257cdd0 AG	278
7fd38af9	279	static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
e9679189 CH	280	const struct svc_version nfsd_acl_version3 = {
	281	.vs_vers = 3,
	282	.vs_nproc = 3,
	283	.vs_proc = nfsd_acl_procedures3,
	284	.vs_count = nfsd_acl_count3,
	285	.vs_dispatch = nfsd_dispatch,
	286	.vs_xdrsize = NFS3_SVC_XDRSIZE,
a257cdd0 AG	287	};
a257cdd0 AG	288