Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 507 insertions, 0 deletions

diff --git a/source3/modules/vfs_zfsacl.c b/source3/modules/vfs_zfsacl.c
new file mode 100644
index 0000000..695abf1
--- /dev/null
+++ b/source3/modules/vfs_zfsacl.c
@@ -0,0 +1,507 @@
+/*
+ * Convert ZFS/NFSv4 acls to NT acls and vice versa.
+ *
+ * Copyright (C) Jiri Sasek, 2007
+ * based on the foobar.c module which is copyrighted by Volker Lendecke
+ *
+ * Many thanks to Axel Apitz for help to fix the special ace's handling
+ * issues.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "smbd/smbd.h"
+#include "nfs4_acls.h"
+
+#ifdef HAVE_FREEBSD_SUNACL_H
+#include "sunacl.h"
+#endif
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+#define ZFSACL_MODULE_NAME "zfsacl"
+
+struct zfsacl_config_data {
+	struct smbacl4_vfs_params nfs4_params;
+	bool zfsacl_map_dacl_protected;
+	bool zfsacl_denymissingspecial;
+	bool zfsacl_block_special;
+};
+
+/* zfs_get_nt_acl()
+ * read the local file's acls and return it in NT form
+ * using the NFSv4 format conversion
+ */
+static NTSTATUS zfs_get_nt_acl_common(struct connection_struct *conn,
+				      TALLOC_CTX *mem_ctx,
+				      const struct smb_filename *smb_fname,
+				      const ace_t *acebuf,
+				      int naces,
+				      struct SMB4ACL_T **ppacl,
+				      struct zfsacl_config_data *config)
+{
+	int i;
+	struct SMB4ACL_T *pacl;
+	SMB_STRUCT_STAT sbuf;
+	const SMB_STRUCT_STAT *psbuf = NULL;
+	int ret;
+	bool inherited_is_present = false;
+	bool is_dir;
+
+	if (VALID_STAT(smb_fname->st)) {
+		psbuf = &smb_fname->st;
+	}
+
+	if (psbuf == NULL) {
+		ret = vfs_stat_smb_basename(conn, smb_fname, &sbuf);
+		if (ret != 0) {
+			DBG_INFO("stat [%s]failed: %s\n",
+				 smb_fname_str_dbg(smb_fname), strerror(errno));
+			return map_nt_error_from_unix(errno);
+		}
+		psbuf = &sbuf;
+	}
+	is_dir = S_ISDIR(psbuf->st_ex_mode);
+
+	mem_ctx = talloc_tos();
+
+	/* create SMB4ACL data */
+	if((pacl = smb_create_smb4acl(mem_ctx)) == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	for(i=0; i<naces; i++) {
+		SMB_ACE4PROP_T aceprop;
+		uint16_t special = 0;
+
+		aceprop.aceType  = (uint32_t) acebuf[i].a_type;
+		aceprop.aceFlags = (uint32_t) acebuf[i].a_flags;
+		aceprop.aceMask  = (uint32_t) acebuf[i].a_access_mask;
+		aceprop.who.id   = (uint32_t) acebuf[i].a_who;
+
+		if (config->zfsacl_block_special &&
+		    (aceprop.aceMask == 0) &&
+		    (aceprop.aceFlags & ACE_EVERYONE) &&
+		    (aceprop.aceFlags & ACE_INHERITED_ACE))
+		{
+			continue;
+		}
+		/*
+		 * Windows clients expect SYNC on acls to correctly allow
+		 * rename, cf bug #7909. But not on DENY ace entries, cf bug
+		 * #8442.
+		 */
+		if (aceprop.aceType == SMB_ACE4_ACCESS_ALLOWED_ACE_TYPE) {
+			aceprop.aceMask |= SMB_ACE4_SYNCHRONIZE;
+		}
+
+		special = acebuf[i].a_flags & (ACE_OWNER|ACE_GROUP|ACE_EVERYONE);
+
+		if (is_dir &&
+		    (aceprop.aceMask & SMB_ACE4_ADD_FILE) &&
+		    (special != 0))
+		{
+			aceprop.aceMask |= SMB_ACE4_DELETE_CHILD;
+		}
+
+#ifdef ACE_INHERITED_ACE
+		if (aceprop.aceFlags & ACE_INHERITED_ACE) {
+			inherited_is_present = true;
+		}
+#endif
+		switch(special) {
+		case(ACE_OWNER):
+			aceprop.flags = SMB_ACE4_ID_SPECIAL;
+			aceprop.who.special_id = SMB_ACE4_WHO_OWNER;
+			break;
+		case(ACE_GROUP):
+			aceprop.flags = SMB_ACE4_ID_SPECIAL;
+			aceprop.who.special_id = SMB_ACE4_WHO_GROUP;
+			break;
+		case(ACE_EVERYONE):
+			aceprop.flags = SMB_ACE4_ID_SPECIAL;
+			aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE;
+			break;
+		default:
+			aceprop.flags	= 0;
+		}
+		if (smb_add_ace4(pacl, &aceprop) == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+	}
+
+#ifdef ACE_INHERITED_ACE
+	if (!inherited_is_present && config->zfsacl_map_dacl_protected) {
+		DBG_DEBUG("Setting SEC_DESC_DACL_PROTECTED on [%s]\n",
+			  smb_fname_str_dbg(smb_fname));
+		smbacl4_set_controlflags(pacl,
+					 SEC_DESC_DACL_PROTECTED |
+					 SEC_DESC_SELF_RELATIVE);
+	}
+#endif
+	*ppacl = pacl;
+	return NT_STATUS_OK;
+}
+
+/* call-back function processing the NT acl -> ZFS acl using NFSv4 conv. */
+static bool zfs_process_smbacl(vfs_handle_struct *handle, files_struct *fsp,
+			       struct SMB4ACL_T *smbacl)
+{
+	int naces = smb_get_naces(smbacl), i, rv;
+	ace_t *acebuf;
+	struct SMB4ACE_T *smbace;
+	TALLOC_CTX	*mem_ctx;
+	bool have_special_id = false;
+	bool must_add_empty_ace = false;
+	struct zfsacl_config_data *config = NULL;
+	int fd;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config,
+				struct zfsacl_config_data,
+				return False);
+
+	if (config->zfsacl_block_special && S_ISDIR(fsp->fsp_name->st.st_ex_mode)) {
+		naces++;
+		must_add_empty_ace = true;
+	}
+	/* allocate the field of ZFS aces */
+	mem_ctx = talloc_tos();
+	acebuf = (ace_t *) talloc_size(mem_ctx, sizeof(ace_t)*naces);
+	if(acebuf == NULL) {
+		errno = ENOMEM;
+		return False;
+	}
+	/* handle all aces */
+	for(smbace = smb_first_ace4(smbacl), i = 0;
+			smbace!=NULL;
+			smbace = smb_next_ace4(smbace), i++) {
+		SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace);
+
+		acebuf[i].a_type        = aceprop->aceType;
+		acebuf[i].a_flags       = aceprop->aceFlags;
+		acebuf[i].a_access_mask = aceprop->aceMask;
+		/* SYNC on acls is a no-op on ZFS.
+		   See bug #7909. */
+		acebuf[i].a_access_mask &= ~SMB_ACE4_SYNCHRONIZE;
+		acebuf[i].a_who         = aceprop->who.id;
+		if(aceprop->flags & SMB_ACE4_ID_SPECIAL) {
+			switch(aceprop->who.special_id) {
+			case SMB_ACE4_WHO_EVERYONE:
+				acebuf[i].a_flags |= ACE_EVERYONE;
+				break;
+			case SMB_ACE4_WHO_OWNER:
+				acebuf[i].a_flags |= ACE_OWNER;
+				break;
+			case SMB_ACE4_WHO_GROUP:
+				acebuf[i].a_flags |= ACE_GROUP|ACE_IDENTIFIER_GROUP;
+				break;
+			default:
+				DEBUG(8, ("unsupported special_id %d\n", \
+					aceprop->who.special_id));
+				continue; /* don't add it !!! */
+			}
+			have_special_id = true;
+		}
+	}
+	if (must_add_empty_ace) {
+		acebuf[i].a_type = SMB_ACE4_ACCESS_ALLOWED_ACE_TYPE;
+		acebuf[i].a_flags = SMB_ACE4_DIRECTORY_INHERIT_ACE |
+			SMB_ACE4_FILE_INHERIT_ACE |
+			ACE_EVERYONE |
+			ACE_INHERITED_ACE;
+		acebuf[i].a_access_mask = 0;
+		i++;
+	}
+
+	if (!have_special_id && config->zfsacl_denymissingspecial) {
+		errno = EACCES;
+		return false;
+	}
+
+	SMB_ASSERT(i == naces);
+
+	/* store acl */
+	fd = fsp_get_pathref_fd(fsp);
+	if (fd == -1) {
+		errno = EBADF;
+		return false;
+	}
+	rv = facl(fd, ACE_SETACL, naces, acebuf);
+	if (rv != 0) {
+		if(errno == ENOSYS) {
+			DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
+				  "supported on the filesystem where the file "
+				  "resides\n", fsp_str_dbg(fsp)));
+		} else {
+			DEBUG(9, ("acl(ACE_SETACL, %s): %s\n", fsp_str_dbg(fsp),
+				  strerror(errno)));
+		}
+		return false;
+	}
+
+	return True;
+}
+
+/* zfs_set_nt_acl()
+ * set the local file's acls obtaining it in NT form
+ * using the NFSv4 format conversion
+ */
+static NTSTATUS zfs_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp,
+			   uint32_t security_info_sent,
+			   const struct security_descriptor *psd)
+{
+	struct zfsacl_config_data *config = NULL;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config,
+				struct zfsacl_config_data,
+				return NT_STATUS_INTERNAL_ERROR);
+
+	return smb_set_nt_acl_nfs4(handle,
+				fsp,
+				&config->nfs4_params,
+				security_info_sent,
+				psd,
+				zfs_process_smbacl);
+}
+
+static int fget_zfsacl(TALLOC_CTX *mem_ctx,
+		       struct files_struct *fsp,
+		       ace_t **outbuf)
+{
+	int naces, rv;
+	ace_t *acebuf = NULL;
+	int fd;
+
+	fd = fsp_get_pathref_fd(fsp);
+	if (fd == -1) {
+		errno = EBADF;
+		return -1;
+	}
+	naces = facl(fd, ACE_GETACLCNT, 0, NULL);
+	if (naces == -1) {
+		int dbg_level = 10;
+
+		if (errno == ENOSYS) {
+			dbg_level = 1;
+		}
+		DEBUG(dbg_level, ("facl(ACE_GETACLCNT, %s): %s\n",
+				  fsp_str_dbg(fsp), strerror(errno)));
+		return naces;
+	}
+
+	acebuf = talloc_size(mem_ctx, sizeof(ace_t)*naces);
+	if (acebuf == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	rv = facl(fd, ACE_GETACL, naces, acebuf);
+	if (rv == -1) {
+		DBG_DEBUG("acl(ACE_GETACL, %s): %s\n",
+			  fsp_str_dbg(fsp), strerror(errno));
+		return -1;
+	}
+
+	*outbuf = acebuf;
+	return naces;
+}
+
+static NTSTATUS zfsacl_fget_nt_acl(struct vfs_handle_struct *handle,
+				   struct files_struct *fsp,
+				   uint32_t security_info,
+				   TALLOC_CTX *mem_ctx,
+				   struct security_descriptor **ppdesc)
+{
+	TALLOC_CTX *frame = NULL;
+	struct SMB4ACL_T *pacl;
+	NTSTATUS status;
+	struct zfsacl_config_data *config = NULL;
+	ace_t *acebuf = NULL;
+	int naces;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config,
+				struct zfsacl_config_data,
+				return NT_STATUS_INTERNAL_ERROR);
+
+	frame = talloc_stackframe();
+
+	naces = fget_zfsacl(talloc_tos(), fsp, &acebuf);
+	if (naces == -1) {
+		status = map_nt_error_from_unix(errno);
+		TALLOC_FREE(frame);
+		if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
+			return status;
+		}
+
+		status = make_default_filesystem_acl(mem_ctx,
+						     DEFAULT_ACL_POSIX,
+						     fsp->fsp_name->base_name,
+						     &fsp->fsp_name->st,
+						     ppdesc);
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+		(*ppdesc)->type |= SEC_DESC_DACL_PROTECTED;
+		return NT_STATUS_OK;
+	}
+
+	status = zfs_get_nt_acl_common(handle->conn,
+				       frame,
+				       fsp->fsp_name,
+				       acebuf,
+				       naces,
+				       &pacl,
+				       config);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(frame);
+		return status;
+	}
+
+	status = smb_fget_nt_acl_nfs4(fsp, NULL, security_info, mem_ctx,
+				      ppdesc, pacl);
+	TALLOC_FREE(frame);
+	return status;
+}
+
+static NTSTATUS zfsacl_fset_nt_acl(vfs_handle_struct *handle,
+			 files_struct *fsp,
+			 uint32_t security_info_sent,
+			 const struct security_descriptor *psd)
+{
+	return zfs_set_nt_acl(handle, fsp, security_info_sent, psd);
+}
+
+/* nils.goroll@hamburg.de 2008-06-16 :
+
+   See also
+   - https://bugzilla.samba.org/show_bug.cgi?id=5446
+   - http://bugs.opensolaris.org/view_bug.do?bug_id=6688240
+
+   Solaris supports NFSv4 and ZFS ACLs through a common system call, acl(2)
+   with ACE_SETACL / ACE_GETACL / ACE_GETACLCNT, which is being wrapped for
+   use by samba in this module.
+
+   As the acl(2) interface is identical for ZFS and for NFS, this module,
+   vfs_zfsacl, can not only be used for ZFS, but also for sharing NFSv4
+   mounts on Solaris.
+
+   But while "traditional" POSIX DRAFT ACLs (using acl(2) with SETACL
+   / GETACL / GETACLCNT) fail for ZFS, the Solaris NFS client
+   implements a compatibility wrapper, which will make calls to
+   traditional ACL calls though vfs_solarisacl succeed. As the
+   compatibility wrapper's implementation is (by design) incomplete,
+   we want to make sure that it is never being called.
+
+   As long as Samba does not support an explicit method for a module
+   to define conflicting vfs methods, we should override all conflicting
+   methods here.
+
+   For this to work, we need to make sure that this module is initialised
+   *after* vfs_solarisacl
+
+   Function declarations taken from vfs_solarisacl
+*/
+
+static SMB_ACL_T zfsacl_fail__sys_acl_get_fd(vfs_handle_struct *handle,
+					     files_struct *fsp,
+					     SMB_ACL_TYPE_T type,
+					     TALLOC_CTX *mem_ctx)
+{
+	return (SMB_ACL_T)NULL;
+}
+
+static int zfsacl_fail__sys_acl_set_fd(vfs_handle_struct *handle,
+				       files_struct *fsp,
+				       SMB_ACL_TYPE_T type,
+				       SMB_ACL_T theacl)
+{
+	return -1;
+}
+
+static int zfsacl_fail__sys_acl_delete_def_fd(vfs_handle_struct *handle,
+					      files_struct *fsp)
+{
+	return -1;
+}
+
+static int zfsacl_fail__sys_acl_blob_get_fd(vfs_handle_struct *handle, files_struct *fsp, TALLOC_CTX *mem_ctx, char **blob_description, DATA_BLOB *blob)
+{
+	return -1;
+}
+
+static int zfsacl_connect(struct vfs_handle_struct *handle,
+			    const char *service, const char *user)
+{
+	struct zfsacl_config_data *config = NULL;
+	int ret;
+
+	ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
+	if (ret < 0) {
+		return ret;
+	}
+
+	config = talloc_zero(handle->conn, struct zfsacl_config_data);
+	if (!config) {
+		DBG_ERR("talloc_zero() failed\n");
+		errno = ENOMEM;
+		return -1;
+	}
+
+	config->zfsacl_map_dacl_protected = lp_parm_bool(SNUM(handle->conn),
+				"zfsacl", "map_dacl_protected", false);
+
+	config->zfsacl_denymissingspecial = lp_parm_bool(SNUM(handle->conn),
+				"zfsacl", "denymissingspecial", false);
+
+	config->zfsacl_block_special = lp_parm_bool(SNUM(handle->conn),
+				"zfsacl", "block_special", true);
+
+	ret = smbacl4_get_vfs_params(handle->conn, &config->nfs4_params);
+	if (ret < 0) {
+		TALLOC_FREE(config);
+		return ret;
+	}
+
+	SMB_VFS_HANDLE_SET_DATA(handle, config,
+				NULL, struct zfsacl_config_data,
+				return -1);
+
+	return 0;
+}
+
+/* VFS operations structure */
+
+static struct vfs_fn_pointers zfsacl_fns = {
+	.connect_fn = zfsacl_connect,
+	.stat_fn = nfs4_acl_stat,
+	.fstat_fn = nfs4_acl_fstat,
+	.lstat_fn = nfs4_acl_lstat,
+	.fstatat_fn = nfs4_acl_fstatat,
+	.sys_acl_get_fd_fn = zfsacl_fail__sys_acl_get_fd,
+	.sys_acl_blob_get_fd_fn = zfsacl_fail__sys_acl_blob_get_fd,
+	.sys_acl_set_fd_fn = zfsacl_fail__sys_acl_set_fd,
+	.sys_acl_delete_def_fd_fn = zfsacl_fail__sys_acl_delete_def_fd,
+	.fget_nt_acl_fn = zfsacl_fget_nt_acl,
+	.fset_nt_acl_fn = zfsacl_fset_nt_acl,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_zfsacl_init(TALLOC_CTX *ctx)
+{
+	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "zfsacl",
+				&zfsacl_fns);
+}