fs/nfsd/nfs3acl.c - linux - Git at Google

 // 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;

 	inode_lock(inode);

 	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:
 	inode_unlock(inode);
 	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 bool
 nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd3_getaclargs *args = rqstp->rq_argp;

 	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 		return false;
 	if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
 		return false;

 	return true;
 }

 static bool
 nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd3_setaclargs *argp = rqstp->rq_argp;

 	if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
 		return false;
 	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
 		return false;
 	if (argp->mask & ~NFS_ACL_MASK)
 		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
 				   &argp->acl_access : NULL))
 		return false;
 	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
 				   &argp->acl_default : NULL))
 		return false;

 	return true;
 }

 /*
  * XDR encode functions
  */

 /* GETACL */
 static bool
 nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd3_getaclres *resp = rqstp->rq_resp;
 	struct dentry *dentry = resp->fh.fh_dentry;
 	struct kvec *head = rqstp->rq_res.head;
 	struct inode *inode;
 	unsigned int base;
 	int n;
 	int w;

 	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		inode = d_inode(dentry);
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 			return false;
 		if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
 			return false;

 		base = (char *)xdr->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 false;
 			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 false;
 		break;
 	default:
 		if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 			return false;
 	}

 	return true;
 }

 /* SETACL */
 static bool
 nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 {
 	struct nfsd3_attrstat *resp = rqstp->rq_resp;

 	return svcxdr_encode_nfsstat3(xdr, resp->status) &&
 		svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
 }

 /*
  * 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,
 		.pc_name = "NULL",
 	},
 	[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),
 		.pc_name = "GETACL",
 	},
 	[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,
 		.pc_name = "SETACL",
 	},
 };

 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,
 };
	// 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;

	inode_lock(inode);

	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:
	inode_unlock(inode);
	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 bool
	nfs3svc_decode_getaclargs(struct svc_rqst rqstp, struct xdr_stream xdr)
	{
	struct nfsd3_getaclargs *args = rqstp->rq_argp;

	if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
	return false;
	if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
	return false;

	return true;
	}

	static bool
	nfs3svc_decode_setaclargs(struct svc_rqst rqstp, struct xdr_stream xdr)
	{
	struct nfsd3_setaclargs *argp = rqstp->rq_argp;

	if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
	return false;
	if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
	return false;
	if (argp->mask & ~NFS_ACL_MASK)
	return false;
	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
	&argp->acl_access : NULL))
	return false;
	if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
	&argp->acl_default : NULL))
	return false;

	return true;
	}

	/*
	* XDR encode functions
	*/

	/* GETACL */
	static bool
	nfs3svc_encode_getaclres(struct svc_rqst rqstp, struct xdr_stream xdr)
	{
	struct nfsd3_getaclres *resp = rqstp->rq_resp;
	struct dentry *dentry = resp->fh.fh_dentry;
	struct kvec *head = rqstp->rq_res.head;
	struct inode *inode;
	unsigned int base;
	int n;
	int w;

	if (!svcxdr_encode_nfsstat3(xdr, resp->status))
	return false;
	switch (resp->status) {
	case nfs_ok:
	inode = d_inode(dentry);
	if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
	return false;
	if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
	return false;

	base = (char )xdr->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 false;
	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 false;
	break;
	default:
	if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
	return false;
	}

	return true;
	}

	/* SETACL */
	static bool
	nfs3svc_encode_setaclres(struct svc_rqst rqstp, struct xdr_stream xdr)
	{
	struct nfsd3_attrstat *resp = rqstp->rq_resp;

	return svcxdr_encode_nfsstat3(xdr, resp->status) &&
	svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
	}

	/*
	* 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_ENTRIES3) / 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,
	.pc_name = "NULL",
	},
	[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),
	.pc_name = "GETACL",
	},
	[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,
	.pc_name = "SETACL",
	},
	};

	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,
	};