1 files changed, 438 insertions, 0 deletions

diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c
new file mode 100644
index 000000000..6a900f770
--- /dev/null
+++ b/fs/nfsd/nfs2acl.c
@@ -0,0 +1,438 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Process version 2 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 NFSDDBG_FACILITY		NFSDDBG_PROC
+
+/*
+ * NULL call.
+ */
+static __be32
+nfsacld_proc_null(struct svc_rqst *rqstp)
+{
+	return rpc_success;
+}
+
+/*
+ * Get the Access and/or Default ACL of a file.
+ */
+static __be32 nfsacld_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;
+
+	dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->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;
+
+	resp->status = fh_getattr(fh, &resp->stat);
+	if (resp->status != nfs_ok)
+		goto out;
+
+	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 nfssvc_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 nfsacld_proc_setacl(struct svc_rqst *rqstp)
+{
+	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
+	struct nfsd_attrstat *resp = rqstp->rq_resp;
+	struct inode *inode;
+	svc_fh *fh;
+	int error;
+
+	dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
+
+	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);
+	if (error)
+		goto out_drop_lock;
+
+	fh_unlock(fh);
+
+	fh_drop_write(fh);
+
+	resp->status = fh_getattr(fh, &resp->stat);
+
+out:
+	/* 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 rpc_success;
+
+out_drop_lock:
+	fh_unlock(fh);
+	fh_drop_write(fh);
+out_errno:
+	resp->status = nfserrno(error);
+	goto out;
+}
+
+/*
+ * Check file attributes
+ */
+static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
+{
+	struct nfsd_fhandle *argp = rqstp->rq_argp;
+	struct nfsd_attrstat *resp = rqstp->rq_resp;
+
+	dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->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;
+	resp->status = fh_getattr(&resp->fh, &resp->stat);
+out:
+	return rpc_success;
+}
+
+/*
+ * Check file access
+ */
+static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
+{
+	struct nfsd3_accessargs *argp = rqstp->rq_argp;
+	struct nfsd3_accessres *resp = rqstp->rq_resp;
+
+	dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
+			SVCFH_fmt(&argp->fh),
+			argp->access);
+
+	fh_copy(&resp->fh, &argp->fh);
+	resp->access = argp->access;
+	resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
+	if (resp->status != nfs_ok)
+		goto out;
+	resp->status = fh_getattr(&resp->fh, &resp->stat);
+out:
+	return rpc_success;
+}
+
+/*
+ * XDR decode functions
+ */
+static int nfsaclsvc_decode_voidarg(struct svc_rqst *rqstp, __be32 *p)
+{
+	return 1;
+}
+
+static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_getaclargs *argp = rqstp->rq_argp;
+
+	p = nfs2svc_decode_fh(p, &argp->fh);
+	if (!p)
+		return 0;
+	argp->mask = ntohl(*p); p++;
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+
+static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_setaclargs *argp = rqstp->rq_argp;
+	struct kvec *head = rqstp->rq_arg.head;
+	unsigned int base;
+	int n;
+
+	p = nfs2svc_decode_fh(p, &argp->fh);
+	if (!p)
+		return 0;
+	argp->mask = ntohl(*p++);
+	if (argp->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,
+			  (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, __be32 *p)
+{
+	struct nfsd_fhandle *argp = rqstp->rq_argp;
+
+	p = nfs2svc_decode_fh(p, &argp->fh);
+	if (!p)
+		return 0;
+	return xdr_argsize_check(rqstp, p);
+}
+
+static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_accessargs *argp = rqstp->rq_argp;
+
+	p = nfs2svc_decode_fh(p, &argp->fh);
+	if (!p)
+		return 0;
+	argp->access = ntohl(*p++);
+
+	return xdr_argsize_check(rqstp, p);
+}
+
+/*
+ * XDR encode functions
+ */
+
+/*
+ * There must be an encoding function for void results so svc_process
+ * will work properly.
+ */
+static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
+{
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* GETACL */
+static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_getaclres *resp = rqstp->rq_resp;
+	struct dentry *dentry = resp->fh.fh_dentry;
+	struct inode *inode;
+	struct kvec *head = rqstp->rq_res.head;
+	unsigned int base;
+	int n;
+	int w;
+
+	*p++ = resp->status;
+	if (resp->status != nfs_ok)
+		return xdr_ressize_check(rqstp, p);
+
+	/*
+	 * Since this is version 2, the check for nfserr in
+	 * nfsd_dispatch actually ensures the following cannot happen.
+	 * However, it seems fragile to depend on that.
+	 */
+	if (dentry == NULL || d_really_is_negative(dentry))
+		return 0;
+	inode = d_inode(dentry);
+
+	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
+	*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);
+	return (n > 0);
+}
+
+static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd_attrstat *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	if (resp->status != nfs_ok)
+		goto out;
+
+	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
+out:
+	return xdr_ressize_check(rqstp, p);
+}
+
+/* ACCESS */
+static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
+{
+	struct nfsd3_accessres *resp = rqstp->rq_resp;
+
+	*p++ = resp->status;
+	if (resp->status != nfs_ok)
+		goto out;
+
+	p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
+	*p++ = htonl(resp->access);
+out:
+	return xdr_ressize_check(rqstp, p);
+}
+
+/*
+ * XDR release functions
+ */
+static void nfsaclsvc_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);
+}
+
+static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp)
+{
+	struct nfsd_attrstat *resp = rqstp->rq_resp;
+
+	fh_put(&resp->fh);
+}
+
+static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
+{
+	struct nfsd3_accessres *resp = rqstp->rq_resp;
+
+	fh_put(&resp->fh);
+}
+
+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_procedures2[5] = {
+	[ACLPROC2_NULL] = {
+		.pc_func = nfsacld_proc_null,
+		.pc_decode = nfsaclsvc_decode_voidarg,
+		.pc_encode = nfsaclsvc_encode_voidres,
+		.pc_argsize = sizeof(struct nfsd3_voidargs),
+		.pc_ressize = sizeof(struct nfsd3_voidargs),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = ST,
+	},
+	[ACLPROC2_GETACL] = {
+		.pc_func = nfsacld_proc_getacl,
+		.pc_decode = nfsaclsvc_decode_getaclargs,
+		.pc_encode = nfsaclsvc_encode_getaclres,
+		.pc_release = nfsaclsvc_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),
+	},
+	[ACLPROC2_SETACL] = {
+		.pc_func = nfsacld_proc_setacl,
+		.pc_decode = nfsaclsvc_decode_setaclargs,
+		.pc_encode = nfsaclsvc_encode_attrstatres,
+		.pc_release = nfsaclsvc_release_attrstat,
+		.pc_argsize = sizeof(struct nfsd3_setaclargs),
+		.pc_ressize = sizeof(struct nfsd_attrstat),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = ST+AT,
+	},
+	[ACLPROC2_GETATTR] = {
+		.pc_func = nfsacld_proc_getattr,
+		.pc_decode = nfsaclsvc_decode_fhandleargs,
+		.pc_encode = nfsaclsvc_encode_attrstatres,
+		.pc_release = nfsaclsvc_release_attrstat,
+		.pc_argsize = sizeof(struct nfsd_fhandle),
+		.pc_ressize = sizeof(struct nfsd_attrstat),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = ST+AT,
+	},
+	[ACLPROC2_ACCESS] = {
+		.pc_func = nfsacld_proc_access,
+		.pc_decode = nfsaclsvc_decode_accessargs,
+		.pc_encode = nfsaclsvc_encode_accessres,
+		.pc_release = nfsaclsvc_release_access,
+		.pc_argsize = sizeof(struct nfsd3_accessargs),
+		.pc_ressize = sizeof(struct nfsd3_accessres),
+		.pc_cachetype = RC_NOCACHE,
+		.pc_xdrressize = ST+AT+1,
+	},
+};
+
+static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)];
+const struct svc_version nfsd_acl_version2 = {
+	.vs_vers	= 2,
+	.vs_nproc	= 5,
+	.vs_proc	= nfsd_acl_procedures2,
+	.vs_count	= nfsd_acl_count2,
+	.vs_dispatch	= nfsd_dispatch,
+	.vs_xdrsize	= NFS3_SVC_XDRSIZE,
+};