[mirror_ubuntu-hirsute-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"

/*
 * 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(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:
	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);
	105
	106	error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
4ac7249e	107	if (error)
99965378 BH	108	goto out_drop_lock;
99965378 BH	109	error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
4ac7249e	110
99965378 BH	111	out_drop_lock:
99965378 BH	112	fh_unlock(fh);
4ac7249e CH	113	fh_drop_write(fh);
4ac7249e CH	114	out_errno:
14168d67	115	resp->status = nfserrno(error);
4ac7249e	116	out:
a257cdd0 AG	117	/* argp->acl_{access,default} may have been allocated in
	118	nfs3svc_decode_setaclargs. */
	119	posix_acl_release(argp->acl_access);
	120	posix_acl_release(argp->acl_default);
cc028a10	121	return rpc_success;
a257cdd0 AG	122	}
	123
	124	/*
	125	* XDR decode functions
	126	*/
026fec7e	127	static int nfs3svc_decode_getaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	128	{
026fec7e CH	129	struct nfsd3_getaclargs *args = rqstp->rq_argp;
026fec7e CH	130
d40aa337 BT	131	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	132	if (!p)
a257cdd0 AG	133	return 0;
	134	args->mask = ntohl(*p); p++;
	135
	136	return xdr_argsize_check(rqstp, p);
	137	}
	138
	139
026fec7e	140	static int nfs3svc_decode_setaclargs(struct svc_rqst rqstp, __be32 p)
a257cdd0	141	{
026fec7e	142	struct nfsd3_setaclargs *args = rqstp->rq_argp;
a257cdd0 AG	143	struct kvec *head = rqstp->rq_arg.head;
	144	unsigned int base;
	145	int n;
	146
d40aa337 BT	147	p = nfs3svc_decode_fh(p, &args->fh);
d40aa337 BT	148	if (!p)
a257cdd0 AG	149	return 0;
a257cdd0 AG	150	args->mask = ntohl(*p++);
7b8f4586	151	if (args->mask & ~NFS_ACL_MASK \|\|
a257cdd0 AG	152	!xdr_argsize_check(rqstp, p))
	153	return 0;
	154
	155	base = (char )p - (char )head->iov_base;
	156	n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
	157	(args->mask & NFS_ACL) ?
	158	&args->acl_access : NULL);
	159	if (n > 0)
	160	n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
	161	(args->mask & NFS_DFACL) ?
	162	&args->acl_default : NULL);
	163	return (n > 0);
	164	}
	165
	166	/*
	167	* XDR encode functions
	168	*/
	169
	170	/* GETACL */
63f8de37	171	static int nfs3svc_encode_getaclres(struct svc_rqst rqstp, __be32 p)
a257cdd0	172	{
63f8de37	173	struct nfsd3_getaclres *resp = rqstp->rq_resp;
a257cdd0 AG	174	struct dentry *dentry = resp->fh.fh_dentry;
a257cdd0 AG	175
cc028a10	176	*p++ = resp->status;
a257cdd0	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
cc028a10	221	*p++ = resp->status;
a257cdd0	222	p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh);
a257cdd0 AG	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	}
a257cdd0 AG	237
a257cdd0 AG	238	struct nfsd3_voidargs { int dummy; };
a257cdd0 AG	239
a257cdd0 AG	240	#define ST 1 /* status*/
	241	#define AT 21 /* attributes */
	242	#define pAT (1+AT) /* post attributes - conditional */
	243	#define ACL (1+NFS_ACL_MAX_ENTRIES3) / Access Control List */
	244
ba1df797 CL	245	static const struct svc_procedure nfsd_acl_procedures3[3] = {
	246	[ACLPROC3_NULL] = {
	247	.pc_func = nfsd3_proc_null,
788f7183 CL	248	.pc_decode = nfssvc_decode_voidarg,
	249	.pc_encode = nfssvc_encode_voidres,
	250	.pc_argsize = sizeof(struct nfsd_voidargs),
	251	.pc_ressize = sizeof(struct nfsd_voidres),
ba1df797 CL	252	.pc_cachetype = RC_NOCACHE,
	253	.pc_xdrressize = ST,
	254	},
	255	[ACLPROC3_GETACL] = {
	256	.pc_func = nfsd3_proc_getacl,
	257	.pc_decode = nfs3svc_decode_getaclargs,
	258	.pc_encode = nfs3svc_encode_getaclres,
	259	.pc_release = nfs3svc_release_getacl,
	260	.pc_argsize = sizeof(struct nfsd3_getaclargs),
	261	.pc_ressize = sizeof(struct nfsd3_getaclres),
	262	.pc_cachetype = RC_NOCACHE,
	263	.pc_xdrressize = ST+1+2*(1+ACL),
	264	},
	265	[ACLPROC3_SETACL] = {
	266	.pc_func = nfsd3_proc_setacl,
	267	.pc_decode = nfs3svc_decode_setaclargs,
	268	.pc_encode = nfs3svc_encode_setaclres,
	269	.pc_release = nfs3svc_release_fhandle,
	270	.pc_argsize = sizeof(struct nfsd3_setaclargs),
	271	.pc_ressize = sizeof(struct nfsd3_attrstat),
	272	.pc_cachetype = RC_NOCACHE,
	273	.pc_xdrressize = ST+pAT,
	274	},
a257cdd0 AG	275	};
a257cdd0 AG	276
7fd38af9	277	static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)];
e9679189 CH	278	const struct svc_version nfsd_acl_version3 = {
	279	.vs_vers = 3,
	280	.vs_nproc = 3,
	281	.vs_proc = nfsd_acl_procedures3,
	282	.vs_count = nfsd_acl_count3,
	283	.vs_dispatch = nfsd_dispatch,
	284	.vs_xdrsize = NFS3_SVC_XDRSIZE,
a257cdd0 AG	285	};
a257cdd0 AG	286