/* * Store posix-level xattrs in a tdb * * Copyright (C) Volker Lendecke, 2007 * * 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 "librpc/gen_ndr/xattr.h" #include "librpc/gen_ndr/ndr_xattr.h" #undef DBGC_CLASS #define DBGC_CLASS DBGC_VFS /* * unmarshall tdb_xattrs */ static NTSTATUS xattr_tdb_pull_attrs(TALLOC_CTX *mem_ctx, const TDB_DATA *data, struct tdb_xattrs **presult) { DATA_BLOB blob; enum ndr_err_code ndr_err; struct tdb_xattrs *result; if (!(result = TALLOC_ZERO_P(mem_ctx, struct tdb_xattrs))) { return NT_STATUS_NO_MEMORY; } if (data->dsize == 0) { *presult = result; return NT_STATUS_OK; } blob = data_blob_const(data->dptr, data->dsize); ndr_err = ndr_pull_struct_blob( &blob, result, NULL, result, (ndr_pull_flags_fn_t)ndr_pull_tdb_xattrs); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { DEBUG(0, ("ndr_pull_tdb_xattrs failed: %s\n", ndr_errstr(ndr_err))); TALLOC_FREE(result); return ndr_map_error2ntstatus(ndr_err);; } *presult = result; return NT_STATUS_OK; } /* * marshall tdb_xattrs */ static NTSTATUS xattr_tdb_push_attrs(TALLOC_CTX *mem_ctx, const struct tdb_xattrs *attribs, TDB_DATA *data) { DATA_BLOB blob; enum ndr_err_code ndr_err; ndr_err = ndr_push_struct_blob( &blob, mem_ctx, NULL, attribs, (ndr_push_flags_fn_t)ndr_push_tdb_xattrs); if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { DEBUG(0, ("ndr_push_tdb_xattrs failed: %s\n", ndr_errstr(ndr_err))); return ndr_map_error2ntstatus(ndr_err);; } *data = make_tdb_data(blob.data, blob.length); return NT_STATUS_OK; } /* * Load tdb_xattrs for a file from the tdb */ static NTSTATUS xattr_tdb_load_attrs(TALLOC_CTX *mem_ctx, struct db_context *db_ctx, const struct file_id *id, struct tdb_xattrs **presult) { uint8 id_buf[16]; NTSTATUS status; TDB_DATA data; /* For backwards compatibility only store the dev/inode. */ push_file_id_16((char *)id_buf, id); if (db_ctx->fetch(db_ctx, mem_ctx, make_tdb_data(id_buf, sizeof(id_buf)), &data) == -1) { return NT_STATUS_INTERNAL_DB_CORRUPTION; } status = xattr_tdb_pull_attrs(mem_ctx, &data, presult); TALLOC_FREE(data.dptr); return status; } /* * fetch_lock the tdb_ea record for a file */ static struct db_record *xattr_tdb_lock_attrs(TALLOC_CTX *mem_ctx, struct db_context *db_ctx, const struct file_id *id) { uint8 id_buf[16]; /* For backwards compatibility only store the dev/inode. */ push_file_id_16((char *)id_buf, id); return db_ctx->fetch_locked(db_ctx, mem_ctx, make_tdb_data(id_buf, sizeof(id_buf))); } /* * Save tdb_xattrs to a previously fetch_locked record */ static NTSTATUS xattr_tdb_save_attrs(struct db_record *rec, const struct tdb_xattrs *attribs) { TDB_DATA data = tdb_null; NTSTATUS status; status = xattr_tdb_push_attrs(talloc_tos(), attribs, &data); if (!NT_STATUS_IS_OK(status)) { DEBUG(0, ("xattr_tdb_push_attrs failed: %s\n", nt_errstr(status))); return status; } status = rec->store(rec, data, 0); TALLOC_FREE(data.dptr); return status; } /* * Worker routine for getxattr and fgetxattr */ static ssize_t xattr_tdb_getattr(struct db_context *db_ctx, const struct file_id *id, const char *name, void *value, size_t size) { struct tdb_xattrs *attribs; uint32_t i; ssize_t result = -1; NTSTATUS status; DEBUG(10, ("xattr_tdb_getattr called for file %s, name %s\n", file_id_string_tos(id), name)); status = xattr_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n", nt_errstr(status))); errno = EINVAL; return -1; } for (i=0; i<attribs->num_eas; i++) { if (strcmp(attribs->eas[i].name, name) == 0) { break; } } if (i == attribs->num_eas) { errno = ENOATTR; goto fail; } if (attribs->eas[i].value.length > size) { errno = ERANGE; goto fail; } memcpy(value, attribs->eas[i].value.data, attribs->eas[i].value.length); result = attribs->eas[i].value.length; fail: TALLOC_FREE(attribs); return result; } static ssize_t xattr_tdb_getxattr(struct vfs_handle_struct *handle, const char *path, const char *name, void *value, size_t size) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (vfs_stat_smb_fname(handle->conn, path, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_getattr(db, &id, name, value, size); } static ssize_t xattr_tdb_fgetxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name, void *value, size_t size) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_getattr(db, &id, name, value, size); } /* * Worker routine for setxattr and fsetxattr */ static int xattr_tdb_setattr(struct db_context *db_ctx, const struct file_id *id, const char *name, const void *value, size_t size, int flags) { NTSTATUS status; struct db_record *rec; struct tdb_xattrs *attribs; uint32_t i; DEBUG(10, ("xattr_tdb_setattr called for file %s, name %s\n", file_id_string_tos(id), name)); rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id); if (rec == NULL) { DEBUG(0, ("xattr_tdb_lock_attrs failed\n")); errno = EINVAL; return -1; } status = xattr_tdb_pull_attrs(rec, &rec->value, &attribs); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n", nt_errstr(status))); TALLOC_FREE(rec); return -1; } for (i=0; i<attribs->num_eas; i++) { if (strcmp(attribs->eas[i].name, name) == 0) { if (flags & XATTR_CREATE) { TALLOC_FREE(rec); errno = EEXIST; return -1; } break; } } if (i == attribs->num_eas) { struct xattr_EA *tmp; if (flags & XATTR_REPLACE) { TALLOC_FREE(rec); errno = ENOATTR; return -1; } tmp = TALLOC_REALLOC_ARRAY( attribs, attribs->eas, struct xattr_EA, attribs->num_eas+ 1); if (tmp == NULL) { DEBUG(0, ("TALLOC_REALLOC_ARRAY failed\n")); TALLOC_FREE(rec); errno = ENOMEM; return -1; } attribs->eas = tmp; attribs->num_eas += 1; } attribs->eas[i].name = name; attribs->eas[i].value.data = CONST_DISCARD(uint8 *, value); attribs->eas[i].value.length = size; status = xattr_tdb_save_attrs(rec, attribs); TALLOC_FREE(rec); if (!NT_STATUS_IS_OK(status)) { DEBUG(1, ("save failed: %s\n", nt_errstr(status))); return -1; } return 0; } static int xattr_tdb_setxattr(struct vfs_handle_struct *handle, const char *path, const char *name, const void *value, size_t size, int flags) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (vfs_stat_smb_fname(handle->conn, path, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_setattr(db, &id, name, value, size, flags); } 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) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_setattr(db, &id, name, value, size, flags); } /* * Worker routine for listxattr and flistxattr */ static ssize_t xattr_tdb_listattr(struct db_context *db_ctx, const struct file_id *id, char *list, size_t size) { NTSTATUS status; struct tdb_xattrs *attribs; uint32_t i; size_t len = 0; status = xattr_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n", nt_errstr(status))); errno = EINVAL; return -1; } DEBUG(10, ("xattr_tdb_listattr: Found %d xattrs\n", attribs->num_eas)); for (i=0; i<attribs->num_eas; i++) { size_t tmp; DEBUG(10, ("xattr_tdb_listattr: xattrs[i].name: %s\n", attribs->eas[i].name)); tmp = strlen(attribs->eas[i].name); /* * Try to protect against overflow */ if (len + (tmp+1) < len) { TALLOC_FREE(attribs); errno = EINVAL; return -1; } /* * Take care of the terminating NULL */ len += (tmp + 1); } if (len > size) { TALLOC_FREE(attribs); errno = ERANGE; return -1; } len = 0; for (i=0; i<attribs->num_eas; i++) { strlcpy(list+len, attribs->eas[i].name, size-len); len += (strlen(attribs->eas[i].name) + 1); } TALLOC_FREE(attribs); return len; } static ssize_t xattr_tdb_listxattr(struct vfs_handle_struct *handle, const char *path, char *list, size_t size) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (vfs_stat_smb_fname(handle->conn, path, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_listattr(db, &id, list, size); } static ssize_t xattr_tdb_flistxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, char *list, size_t size) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_listattr(db, &id, list, size); } /* * Worker routine for removexattr and fremovexattr */ static int xattr_tdb_removeattr(struct db_context *db_ctx, const struct file_id *id, const char *name) { NTSTATUS status; struct db_record *rec; struct tdb_xattrs *attribs; uint32_t i; rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id); if (rec == NULL) { DEBUG(0, ("xattr_tdb_lock_attrs failed\n")); errno = EINVAL; return -1; } status = xattr_tdb_pull_attrs(rec, &rec->value, &attribs); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n", nt_errstr(status))); TALLOC_FREE(rec); return -1; } for (i=0; i<attribs->num_eas; i++) { if (strcmp(attribs->eas[i].name, name) == 0) { break; } } if (i == attribs->num_eas) { TALLOC_FREE(rec); errno = ENOATTR; return -1; } attribs->eas[i] = attribs->eas[attribs->num_eas-1]; attribs->num_eas -= 1; if (attribs->num_eas == 0) { rec->delete_rec(rec); TALLOC_FREE(rec); return 0; } status = xattr_tdb_save_attrs(rec, attribs); TALLOC_FREE(rec); if (!NT_STATUS_IS_OK(status)) { DEBUG(1, ("save failed: %s\n", nt_errstr(status))); return -1; } return 0; } static int xattr_tdb_removexattr(struct vfs_handle_struct *handle, const char *path, const char *name) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (vfs_stat_smb_fname(handle->conn, path, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_removeattr(db, &id, name); } static int xattr_tdb_fremovexattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); return xattr_tdb_removeattr(db, &id, name); } /* * Open the tdb file upon VFS_CONNECT */ static bool xattr_tdb_init(int snum, struct db_context **p_db) { struct db_context *db; const char *dbname; char *def_dbname; def_dbname = state_path("xattr.tdb"); if (def_dbname == NULL) { errno = ENOSYS; return false; } dbname = lp_parm_const_string(snum, "xattr_tdb", "file", def_dbname); /* now we know dbname is not NULL */ become_root(); db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600); unbecome_root(); if (db == NULL) { #if defined(ENOTSUP) errno = ENOTSUP; #else errno = ENOSYS; #endif TALLOC_FREE(def_dbname); return false; } *p_db = db; TALLOC_FREE(def_dbname); return true; } /* * On unlink we need to delete the tdb record */ static int xattr_tdb_unlink(vfs_handle_struct *handle, const struct smb_filename *smb_fname) { struct smb_filename *smb_fname_tmp = NULL; struct file_id id; struct db_context *db; struct db_record *rec; NTSTATUS status; int ret = -1; bool remove_record = false; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp); if (!NT_STATUS_IS_OK(status)) { errno = map_errno_from_nt_status(status); return -1; } if (lp_posix_pathnames()) { ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp); } else { ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp); } if (ret == -1) { goto out; } if (smb_fname_tmp->st.st_ex_nlink == 1) { /* Only remove record on last link to file. */ remove_record = true; } ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_tmp); if (ret == -1) { goto out; } if (!remove_record) { goto out; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &smb_fname_tmp->st); rec = xattr_tdb_lock_attrs(talloc_tos(), db, &id); /* * If rec == NULL there's not much we can do about it */ if (rec != NULL) { rec->delete_rec(rec); TALLOC_FREE(rec); } out: TALLOC_FREE(smb_fname_tmp); return ret; } /* * On rmdir we need to delete the tdb record */ static int xattr_tdb_rmdir(vfs_handle_struct *handle, const char *path) { SMB_STRUCT_STAT sbuf; struct file_id id; struct db_context *db; struct db_record *rec; int ret; SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1); if (vfs_stat_smb_fname(handle->conn, path, &sbuf) == -1) { return -1; } ret = SMB_VFS_NEXT_RMDIR(handle, path); if (ret == -1) { return -1; } id = SMB_VFS_FILE_ID_CREATE(handle->conn, &sbuf); rec = xattr_tdb_lock_attrs(talloc_tos(), db, &id); /* * If rec == NULL there's not much we can do about it */ if (rec != NULL) { rec->delete_rec(rec); TALLOC_FREE(rec); } return 0; } /* * Destructor for the VFS private data */ static void close_xattr_db(void **data) { struct db_context **p_db = (struct db_context **)data; TALLOC_FREE(*p_db); } static int xattr_tdb_connect(vfs_handle_struct *handle, const char *service, const char *user) { fstring sname; int res, snum; struct db_context *db; res = SMB_VFS_NEXT_CONNECT(handle, service, user); if (res < 0) { return res; } fstrcpy(sname, service); snum = find_service(sname); if (snum == -1) { /* * Should not happen, but we should not fail just *here*. */ return 0; } if (!xattr_tdb_init(snum, &db)) { DEBUG(5, ("Could not init xattr tdb\n")); lp_do_parameter(snum, "ea support", "False"); return 0; } lp_do_parameter(snum, "ea support", "True"); SMB_VFS_HANDLE_SET_DATA(handle, db, close_xattr_db, struct db_context, return -1); return 0; } static struct vfs_fn_pointers vfs_xattr_tdb_fns = { .getxattr = xattr_tdb_getxattr, .fgetxattr = xattr_tdb_fgetxattr, .setxattr = xattr_tdb_setxattr, .fsetxattr = xattr_tdb_fsetxattr, .listxattr = xattr_tdb_listxattr, .flistxattr = xattr_tdb_flistxattr, .removexattr = xattr_tdb_removexattr, .fremovexattr = xattr_tdb_fremovexattr, .unlink = xattr_tdb_unlink, .rmdir = xattr_tdb_rmdir, .connect_fn = xattr_tdb_connect, }; NTSTATUS vfs_xattr_tdb_init(void); NTSTATUS vfs_xattr_tdb_init(void) { return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "xattr_tdb", &vfs_xattr_tdb_fns); }