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, 702 insertions, 0 deletions

diff --git a/source3/modules/vfs_xattr_tdb.c b/source3/modules/vfs_xattr_tdb.c
new file mode 100644
index 0000000..447d868
--- /dev/null
+++ b/source3/modules/vfs_xattr_tdb.c
@@ -0,0 +1,702 @@
+/*
+ * Store posix-level xattrs in a tdb
+ *
+ * Copyright (C) Volker Lendecke, 2007
+ * Copyright (C) Andrew Bartlett, 2012
+ *
+ * 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 "dbwrap/dbwrap.h"
+#include "dbwrap/dbwrap_open.h"
+#include "source3/lib/xattr_tdb.h"
+#include "lib/util/tevent_unix.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+struct xattr_tdb_config {
+	struct db_context *db;
+	bool ignore_user_xattr;
+};
+
+static bool xattr_tdb_init(struct vfs_handle_struct *handle,
+			   struct xattr_tdb_config **_config);
+
+static bool is_user_xattr(const char *xattr_name)
+{
+	int match;
+
+	match = strncmp(xattr_name, "user.", strlen("user."));
+	return (match == 0);
+}
+
+static int xattr_tdb_get_file_id(struct vfs_handle_struct *handle,
+				const char *path, struct file_id *id)
+{
+	int ret;
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct smb_filename *smb_fname;
+
+	smb_fname = synthetic_smb_fname(frame,
+					path,
+					NULL,
+					NULL,
+					0,
+					0);
+	if (smb_fname == NULL) {
+		TALLOC_FREE(frame);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
+
+	if (ret == -1) {
+		TALLOC_FREE(frame); 
+		return -1;
+	}
+
+	*id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname->st);
+	TALLOC_FREE(frame);
+	return 0;
+}
+
+struct xattr_tdb_getxattrat_state {
+	struct vfs_aio_state vfs_aio_state;
+	ssize_t xattr_size;
+	uint8_t *xattr_value;
+};
+
+static void xattr_tdb_getxattrat_done(struct tevent_req *subreq);
+
+static struct tevent_req *xattr_tdb_getxattrat_send(
+			TALLOC_CTX *mem_ctx,
+			struct tevent_context *ev,
+			struct vfs_handle_struct *handle,
+			files_struct *dir_fsp,
+			const struct smb_filename *smb_fname,
+			const char *xattr_name,
+			size_t alloc_hint)
+{
+	struct xattr_tdb_config *config = NULL;
+	struct tevent_req *req = NULL;
+	struct tevent_req *subreq = NULL;
+	struct xattr_tdb_getxattrat_state *state = NULL;
+	struct smb_filename *cwd = NULL;
+	struct file_id id;
+	int ret;
+	int error;
+	int cwd_ret;
+	DATA_BLOB xattr_blob;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return NULL;
+	}
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct xattr_tdb_getxattrat_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->xattr_size = -1;
+
+	if (config->ignore_user_xattr && is_user_xattr(xattr_name)) {
+		subreq = SMB_VFS_NEXT_GETXATTRAT_SEND(state,
+						      ev,
+						      handle,
+						      dir_fsp,
+						      smb_fname,
+						      xattr_name,
+						      alloc_hint);
+		if (tevent_req_nomem(subreq, req)) {
+			return tevent_req_post(req, ev);
+		}
+		tevent_req_set_callback(subreq, xattr_tdb_getxattrat_done, req);
+		return req;
+	}
+
+	cwd = SMB_VFS_GETWD(dir_fsp->conn, state);
+	if (tevent_req_nomem(cwd, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	ret = SMB_VFS_CHDIR(dir_fsp->conn, dir_fsp->fsp_name);
+	if (ret != 0) {
+		tevent_req_error(req, errno);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
+	error = errno;
+
+	cwd_ret = SMB_VFS_CHDIR(dir_fsp->conn, cwd);
+	SMB_ASSERT(cwd_ret == 0);
+
+	if (ret == -1) {
+		tevent_req_error(req, error);
+		return tevent_req_post(req, ev);
+	}
+
+	state->xattr_size = xattr_tdb_getattr(config->db,
+					      state,
+					      &id,
+					      xattr_name,
+					      &xattr_blob);
+	if (state->xattr_size == -1) {
+		tevent_req_error(req, errno);
+		return tevent_req_post(req, ev);
+	}
+
+	if (alloc_hint == 0) {
+		/*
+		 * The caller only wants to know the size.
+		 */
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	if (state->xattr_size == 0) {
+		/*
+		 * There's no data.
+		 */
+		tevent_req_done(req);
+		return tevent_req_post(req, ev);
+	}
+
+	if (xattr_blob.length > alloc_hint) {
+		/*
+		 * The data doesn't fit.
+		 */
+		state->xattr_size = -1;
+		tevent_req_error(req, ERANGE);
+		return tevent_req_post(req, ev);
+	}
+
+	/*
+	 * take the whole blob.
+	 */
+	state->xattr_value = xattr_blob.data;
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static void xattr_tdb_getxattrat_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct xattr_tdb_getxattrat_state *state = tevent_req_data(
+		req, struct xattr_tdb_getxattrat_state);
+
+	state->xattr_size = SMB_VFS_NEXT_GETXATTRAT_RECV(subreq,
+							 &state->vfs_aio_state,
+							 state,
+							 &state->xattr_value);
+	TALLOC_FREE(subreq);
+	if (state->xattr_size == -1) {
+		tevent_req_error(req, state->vfs_aio_state.error);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+
+static ssize_t xattr_tdb_getxattrat_recv(struct tevent_req *req,
+					 struct vfs_aio_state *aio_state,
+					 TALLOC_CTX *mem_ctx,
+					 uint8_t **xattr_value)
+{
+	struct xattr_tdb_getxattrat_state *state = tevent_req_data(
+		req, struct xattr_tdb_getxattrat_state);
+	ssize_t xattr_size;
+
+	if (tevent_req_is_unix_error(req, &aio_state->error)) {
+		tevent_req_received(req);
+		return -1;
+	}
+
+	*aio_state = state->vfs_aio_state;
+	xattr_size = state->xattr_size;
+	if (xattr_value != NULL) {
+		*xattr_value = talloc_move(mem_ctx, &state->xattr_value);
+	}
+
+	tevent_req_received(req);
+	return xattr_size;
+}
+
+static ssize_t xattr_tdb_fgetxattr(struct vfs_handle_struct *handle,
+				   struct files_struct *fsp,
+				   const char *name, void *value, size_t size)
+{
+	struct xattr_tdb_config *config = NULL;
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	ssize_t xattr_size;
+	DATA_BLOB blob;
+	TALLOC_CTX *frame = NULL;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	if (config->ignore_user_xattr && is_user_xattr(name)) {
+		return SMB_VFS_NEXT_FGETXATTR(
+			handle, fsp, name, value, size);
+	}
+
+	if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	frame = talloc_stackframe();
+
+	id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
+
+	xattr_size = xattr_tdb_getattr(config->db, frame, &id, name, &blob);
+	if (xattr_size < 0) {
+		errno = ENOATTR;
+		TALLOC_FREE(frame);
+		return -1;
+	}
+
+	if (size == 0) {
+		TALLOC_FREE(frame);
+		return xattr_size;
+	}
+
+	if (blob.length > size) {
+		TALLOC_FREE(frame);
+		errno = ERANGE;
+		return -1;
+	}
+	memcpy(value, blob.data, xattr_size);
+	TALLOC_FREE(frame);
+	return xattr_size;
+}
+
+static int xattr_tdb_fsetxattr(struct vfs_handle_struct *handle,
+			       struct files_struct *fsp,
+			       const char *name, const void *value,
+			       size_t size, int flags)
+{
+	struct xattr_tdb_config *config = NULL;
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	int ret;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	if (config->ignore_user_xattr && is_user_xattr(name)) {
+		return SMB_VFS_NEXT_FSETXATTR(
+			handle, fsp, name, value, size, flags);
+	}
+
+	if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
+
+	ret = xattr_tdb_setattr(config->db, &id, name, value, size, flags);
+	return ret;
+
+}
+
+static ssize_t xattr_tdb_flistxattr(struct vfs_handle_struct *handle,
+				    struct files_struct *fsp, char *list,
+				    size_t size)
+{
+	struct xattr_tdb_config *config = NULL;
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	ssize_t backend_size;
+	ssize_t ret;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
+
+	ret = xattr_tdb_listattr(config->db, &id, list, size);
+	if (ret == -1) {
+		return -1;
+	}
+	if (ret == size) {
+		return ret;
+	}
+	if (!config->ignore_user_xattr) {
+		return ret;
+	}
+	SMB_ASSERT(ret < size);
+
+	backend_size = SMB_VFS_NEXT_FLISTXATTR(
+		handle, fsp, list + ret, size - ret);
+	if (backend_size == -1) {
+		return -1;
+	}
+
+	return ret + backend_size;
+}
+
+static int xattr_tdb_fremovexattr(struct vfs_handle_struct *handle,
+				  struct files_struct *fsp, const char *name)
+{
+	struct xattr_tdb_config *config = NULL;
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	if (config->ignore_user_xattr && is_user_xattr(name)) {
+		return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
+	}
+
+	if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
+
+	return xattr_tdb_removeattr(config->db, &id, name);
+}
+
+/*
+ * Destructor for the VFS private data
+ */
+
+static void config_destructor(void **data)
+{
+	struct xattr_tdb_config **config = (struct xattr_tdb_config **)data;
+	TALLOC_FREE((*config)->db);
+}
+
+/*
+ * Open the tdb file upon VFS_CONNECT
+ */
+
+static bool xattr_tdb_init(struct vfs_handle_struct *handle,
+			   struct xattr_tdb_config **_config)
+{
+	struct xattr_tdb_config *config = NULL;
+	const char *dbname;
+	char *def_dbname;
+
+	if (SMB_VFS_HANDLE_TEST_DATA(handle)) {
+		SMB_VFS_HANDLE_GET_DATA(handle, config, struct xattr_tdb_config,
+					return false);
+		if (_config != NULL) {
+			*_config = config;
+		}
+		return true;
+	}
+
+	config = talloc_zero(handle->conn, struct xattr_tdb_config);
+	if (config == NULL) {
+		errno = ENOMEM;
+		goto error;
+	}
+
+	def_dbname = state_path(talloc_tos(), "xattr.tdb");
+	if (def_dbname == NULL) {
+		errno = ENOSYS;
+		goto error;
+	}
+
+	dbname = lp_parm_const_string(SNUM(handle->conn),
+				      "xattr_tdb",
+				      "file",
+				      def_dbname);
+
+	/* now we know dbname is not NULL */
+
+	become_root();
+	config->db = db_open(handle, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
+			     DBWRAP_LOCK_ORDER_2, DBWRAP_FLAG_NONE);
+	unbecome_root();
+
+	if (config->db == NULL) {
+#if defined(ENOTSUP)
+		errno = ENOTSUP;
+#else
+		errno = ENOSYS;
+#endif
+		TALLOC_FREE(def_dbname);
+		goto error;
+	}
+	TALLOC_FREE(def_dbname);
+
+	config->ignore_user_xattr = lp_parm_bool(
+		SNUM(handle->conn), "xattr_tdb", "ignore_user_xattr", false);
+
+	SMB_VFS_HANDLE_SET_DATA(handle, config, config_destructor,
+				struct xattr_tdb_config, return false);
+
+	if (_config != NULL) {
+		*_config = config;
+	}
+	return true;
+
+error:
+	DBG_WARNING("Failed to initialize config: %s\n", strerror(errno));
+	lp_do_parameter(SNUM(handle->conn), "ea support", "False");
+	return false;
+}
+
+static int xattr_tdb_openat(struct vfs_handle_struct *handle,
+			    const struct files_struct *dirfsp,
+			    const struct smb_filename *smb_fname,
+			    struct files_struct *fsp,
+			    const struct vfs_open_how *how)
+{
+	struct xattr_tdb_config *config = NULL;
+	SMB_STRUCT_STAT sbuf;
+	int fd;
+	int ret;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	fd = SMB_VFS_NEXT_OPENAT(handle,
+				 dirfsp,
+				 smb_fname,
+				 fsp,
+				 how);
+	if (fd == -1) {
+		return -1;
+	}
+
+	if ((how->flags & (O_CREAT|O_EXCL)) != (O_CREAT|O_EXCL)) {
+		return fd;
+	}
+
+	/*
+	 * We know we used O_CREAT|O_EXCL and it worked.
+	 * We must have created the file.
+	 */
+
+	fsp_set_fd(fsp, fd);
+	ret = SMB_VFS_FSTAT(fsp, &sbuf);
+	fsp_set_fd(fsp, -1);
+	if (ret == -1) {
+		/* Can't happen... */
+		DBG_WARNING("SMB_VFS_FSTAT failed on file %s (%s)\n",
+			    smb_fname_str_dbg(smb_fname),
+			    strerror(errno));
+		return -1;
+	}
+
+	fsp->file_id = SMB_VFS_FILE_ID_CREATE(fsp->conn, &sbuf);
+
+	xattr_tdb_remove_all_attrs(config->db, &fsp->file_id);
+
+	return fd;
+}
+
+static int xattr_tdb_mkdirat(vfs_handle_struct *handle,
+		struct files_struct *dirfsp,
+		const struct smb_filename *smb_fname,
+		mode_t mode)
+{
+	struct xattr_tdb_config *config = NULL;
+	struct file_id fileid;
+	struct stat_ex sbuf = { .st_ex_nlink = 0, };
+	int ret;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	ret = SMB_VFS_NEXT_MKDIRAT(handle,
+				dirfsp,
+				smb_fname,
+				mode);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = SMB_VFS_NEXT_FSTATAT(
+		handle, dirfsp, smb_fname, &sbuf, AT_SYMLINK_NOFOLLOW);
+
+	if (ret == -1) {
+		/* Rename race. Let upper level take care of it. */
+		return -1;
+	}
+	if (!S_ISDIR(sbuf.st_ex_mode)) {
+		/* Rename race. Let upper level take care of it. */
+		return -1;
+	}
+
+	fileid = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf);
+
+	xattr_tdb_remove_all_attrs(config->db, &fileid);
+	return 0;
+}
+
+/*
+ * On unlink we need to delete the tdb record
+ */
+static int xattr_tdb_unlinkat(vfs_handle_struct *handle,
+			struct files_struct *dirfsp,
+			const struct smb_filename *smb_fname,
+			int flags)
+{
+	struct xattr_tdb_config *config = NULL;
+	struct smb_filename *smb_fname_tmp = NULL;
+	struct smb_filename *full_fname = NULL;
+	struct file_id id;
+	int ret = -1;
+	bool remove_record = false;
+	TALLOC_CTX *frame = NULL;
+
+	if (!xattr_tdb_init(handle, &config)) {
+		return -1;
+	}
+
+	frame = talloc_stackframe();
+
+	smb_fname_tmp = cp_smb_filename(frame, smb_fname);
+	if (smb_fname_tmp == NULL) {
+		TALLOC_FREE(frame);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	/*
+	 * TODO: use SMB_VFS_STATX() once we have that
+	 */
+
+	full_fname = full_path_from_dirfsp_atname(frame,
+						  dirfsp,
+						  smb_fname);
+	if (full_fname == NULL) {
+		goto out;
+	}
+
+	if (full_fname->flags & SMB_FILENAME_POSIX_PATH) {
+		ret = SMB_VFS_NEXT_LSTAT(handle, full_fname);
+	} else {
+		ret = SMB_VFS_NEXT_STAT(handle, full_fname);
+		if (ret == -1 && (errno == ENOENT || errno == ELOOP)) {
+			if (VALID_STAT(smb_fname->st) &&
+					S_ISLNK(smb_fname->st.st_ex_mode)) {
+				/*
+				 * Original name was a link - Could be
+				 * trying to remove a dangling symlink.
+				 */
+				ret = SMB_VFS_NEXT_LSTAT(handle, full_fname);
+			}
+		}
+	}
+	if (ret == -1) {
+		goto out;
+	}
+	smb_fname_tmp->st = full_fname->st;
+
+	if (flags & AT_REMOVEDIR) {
+		/* Always remove record when removing a directory succeeds. */
+		remove_record = true;
+	} else {
+		if (smb_fname_tmp->st.st_ex_nlink == 1) {
+			/* Only remove record on last link to file. */
+			remove_record = true;
+		}
+	}
+
+	ret = SMB_VFS_NEXT_UNLINKAT(handle,
+				dirfsp,
+				smb_fname_tmp,
+				flags);
+
+	if (ret == -1) {
+		goto out;
+	}
+
+	if (!remove_record) {
+		goto out;
+	}
+
+	id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname_tmp->st);
+
+	xattr_tdb_remove_all_attrs(config->db, &id);
+
+ out:
+	TALLOC_FREE(frame);
+	return ret;
+}
+
+static int xattr_tdb_connect(vfs_handle_struct *handle, const char *service,
+			  const char *user)
+{
+	char *sname = NULL;
+	int res, snum;
+
+	res = SMB_VFS_NEXT_CONNECT(handle, service, user);
+	if (res < 0) {
+		return res;
+	}
+
+	snum = find_service(talloc_tos(), service, &sname);
+	if (snum == -1 || sname == NULL) {
+		/*
+		 * Should not happen, but we should not fail just *here*.
+		 */
+		return 0;
+	}
+
+	if (!xattr_tdb_init(handle, NULL)) {
+		DEBUG(5, ("Could not init xattr tdb\n"));
+		lp_do_parameter(snum, "ea support", "False");
+		return 0;
+	}
+
+	lp_do_parameter(snum, "ea support", "True");
+
+	return 0;
+}
+
+static struct vfs_fn_pointers vfs_xattr_tdb_fns = {
+	.getxattrat_send_fn = xattr_tdb_getxattrat_send,
+	.getxattrat_recv_fn = xattr_tdb_getxattrat_recv,
+	.fgetxattr_fn = xattr_tdb_fgetxattr,
+	.fsetxattr_fn = xattr_tdb_fsetxattr,
+	.flistxattr_fn = xattr_tdb_flistxattr,
+	.fremovexattr_fn = xattr_tdb_fremovexattr,
+	.openat_fn = xattr_tdb_openat,
+	.mkdirat_fn = xattr_tdb_mkdirat,
+	.unlinkat_fn = xattr_tdb_unlinkat,
+	.connect_fn = xattr_tdb_connect,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_xattr_tdb_init(TALLOC_CTX *ctx)
+{
+	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "xattr_tdb",
+				&vfs_xattr_tdb_fns);
+}