// SPDX-License-Identifier: LGPL-2.1 /* * * vfs operations that deal with io control * * Copyright (C) International Business Machines Corp., 2005,2013 * Author(s): Steve French (sfrench@us.ibm.com) * */ #include #include #include #include #include #include "cifspdu.h" #include "cifsglob.h" #include "cifsproto.h" #include "cifs_debug.h" #include "cifsfs.h" #include "cifs_ioctl.h" #include "smb2proto.h" #include "smb2glob.h" #include static long cifs_ioctl_query_info(unsigned int xid, struct file *filep, unsigned long p) { struct inode *inode = file_inode(filep); struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); struct dentry *dentry = filep->f_path.dentry; const unsigned char *path; void *page = alloc_dentry_path(); __le16 *utf16_path = NULL, root_path; int rc = 0; path = build_path_from_dentry(dentry, page); if (IS_ERR(path)) { free_dentry_path(page); return PTR_ERR(path); } cifs_dbg(FYI, "%s %s\n", __func__, path); if (!path[0]) { root_path = 0; utf16_path = &root_path; } else { utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb); if (!utf16_path) { rc = -ENOMEM; goto ici_exit; } } if (tcon->ses->server->ops->ioctl_query_info) rc = tcon->ses->server->ops->ioctl_query_info( xid, tcon, cifs_sb, utf16_path, filep->private_data ? 0 : 1, p); else rc = -EOPNOTSUPP; ici_exit: if (utf16_path != &root_path) kfree(utf16_path); free_dentry_path(page); return rc; } static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file, unsigned long srcfd) { int rc; struct fd src_file; struct inode *src_inode; cifs_dbg(FYI, "ioctl copychunk range\n"); /* the destination must be opened for writing */ if (!(dst_file->f_mode & FMODE_WRITE)) { cifs_dbg(FYI, "file target not open for write\n"); return -EINVAL; } /* check if target volume is readonly and take reference */ rc = mnt_want_write_file(dst_file); if (rc) { cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc); return rc; } src_file = fdget(srcfd); if (!src_file.file) { rc = -EBADF; goto out_drop_write; } if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) { rc = -EBADF; cifs_dbg(VFS, "src file seems to be from a different filesystem type\n"); goto out_fput; } src_inode = file_inode(src_file.file); rc = -EINVAL; if (S_ISDIR(src_inode->i_mode)) goto out_fput; rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0, src_inode->i_size, 0); if (rc > 0) rc = 0; out_fput: fdput(src_file); out_drop_write: mnt_drop_write_file(dst_file); return rc; } static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon, void __user *arg) { int rc = 0; struct smb_mnt_fs_info *fsinf; fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL); if (fsinf == NULL) return -ENOMEM; fsinf->version = 1; fsinf->protocol_id = tcon->ses->server->vals->protocol_id; fsinf->device_characteristics = le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics); fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType); fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes); fsinf->max_path_component = le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); fsinf->vol_serial_number = tcon->vol_serial_number; fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time); fsinf->share_flags = tcon->share_flags; fsinf->share_caps = le32_to_cpu(tcon->capabilities); fsinf->sector_flags = tcon->ss_flags; fsinf->optimal_sector_size = tcon->perf_sector_size; fsinf->max_bytes_chunk = tcon->max_bytes_chunk; fsinf->maximal_access = tcon->maximal_access; fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability); if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info))) rc = -EFAULT; kfree(fsinf); return rc; } static int cifs_shutdown(struct super_block *sb, unsigned long arg) { struct cifs_sb_info *sbi = CIFS_SB(sb); __u32 flags; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(flags, (__u32 __user *)arg)) return -EFAULT; if (flags > CIFS_GOING_FLAGS_NOLOGFLUSH) return -EINVAL; if (cifs_forced_shutdown(sbi)) return 0; cifs_dbg(VFS, "shut down requested (%d)", flags); /* trace_cifs_shutdown(sb, flags);*/ /* * see: * https://man7.org/linux/man-pages/man2/ioctl_xfs_goingdown.2.html * for more information and description of original intent of the flags */ switch (flags) { /* * We could add support later for default flag which requires: * "Flush all dirty data and metadata to disk" * would need to call syncfs or equivalent to flush page cache for * the mount and then issue fsync to server (if nostrictsync not set) */ case CIFS_GOING_FLAGS_DEFAULT: cifs_dbg(FYI, "shutdown with default flag not supported\n"); return -EINVAL; /* * FLAGS_LOGFLUSH is easy since it asks to write out metadata (not * data) but metadata writes are not cached on the client, so can treat * it similarly to NOLOGFLUSH */ case CIFS_GOING_FLAGS_LOGFLUSH: case CIFS_GOING_FLAGS_NOLOGFLUSH: sbi->mnt_cifs_flags |= CIFS_MOUNT_SHUTDOWN; return 0; default: return -EINVAL; } return 0; } static int cifs_dump_full_key(struct cifs_tcon *tcon, struct smb3_full_key_debug_info __user *in) { struct smb3_full_key_debug_info out; struct cifs_ses *ses; int rc = 0; bool found = false; u8 __user *end; if (!smb3_encryption_required(tcon)) { rc = -EOPNOTSUPP; goto out; } /* copy user input into our output buffer */ if (copy_from_user(&out, in, sizeof(out))) { rc = -EINVAL; goto out; } if (!out.session_id) { /* if ses id is 0, use current user session */ ses = tcon->ses; } else { /* otherwise if a session id is given, look for it in all our sessions */ struct cifs_ses *ses_it = NULL; struct TCP_Server_Info *server_it = NULL; spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(server_it, &cifs_tcp_ses_list, tcp_ses_list) { list_for_each_entry(ses_it, &server_it->smb_ses_list, smb_ses_list) { if (ses_it->Suid == out.session_id) { ses = ses_it; /* * since we are using the session outside the crit * section, we need to make sure it won't be released * so increment its refcount */ ses->ses_count++; found = true; goto search_end; } } } search_end: spin_unlock(&cifs_tcp_ses_lock); if (!found) { rc = -ENOENT; goto out; } } switch (ses->server->cipher_type) { case SMB2_ENCRYPTION_AES128_CCM: case SMB2_ENCRYPTION_AES128_GCM: out.session_key_length = CIFS_SESS_KEY_SIZE; out.server_in_key_length = out.server_out_key_length = SMB3_GCM128_CRYPTKEY_SIZE; break; case SMB2_ENCRYPTION_AES256_CCM: case SMB2_ENCRYPTION_AES256_GCM: out.session_key_length = CIFS_SESS_KEY_SIZE; out.server_in_key_length = out.server_out_key_length = SMB3_GCM256_CRYPTKEY_SIZE; break; default: rc = -EOPNOTSUPP; goto out; } /* check if user buffer is big enough to store all the keys */ if (out.in_size < sizeof(out) + out.session_key_length + out.server_in_key_length + out.server_out_key_length) { rc = -ENOBUFS; goto out; } out.session_id = ses->Suid; out.cipher_type = le16_to_cpu(ses->server->cipher_type); /* overwrite user input with our output */ if (copy_to_user(in, &out, sizeof(out))) { rc = -EINVAL; goto out; } /* append all the keys at the end of the user buffer */ end = in->data; if (copy_to_user(end, ses->auth_key.response, out.session_key_length)) { rc = -EINVAL; goto out; } end += out.session_key_length; if (copy_to_user(end, ses->smb3encryptionkey, out.server_in_key_length)) { rc = -EINVAL; goto out; } end += out.server_in_key_length; if (copy_to_user(end, ses->smb3decryptionkey, out.server_out_key_length)) { rc = -EINVAL; goto out; } out: if (found) cifs_put_smb_ses(ses); return rc; } long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) { struct inode *inode = file_inode(filep); struct smb3_key_debug_info pkey_inf; int rc = -ENOTTY; /* strange error - but the precedent */ unsigned int xid; struct cifsFileInfo *pSMBFile = filep->private_data; struct cifs_tcon *tcon; struct tcon_link *tlink; struct cifs_sb_info *cifs_sb; __u64 ExtAttrBits = 0; __u64 caps; xid = get_xid(); cifs_dbg(FYI, "cifs ioctl 0x%x\n", command); switch (command) { case FS_IOC_GETFLAGS: if (pSMBFile == NULL) break; tcon = tlink_tcon(pSMBFile->tlink); caps = le64_to_cpu(tcon->fsUnixInfo.Capability); #ifdef CONFIG_CIFS_POSIX if (CIFS_UNIX_EXTATTR_CAP & caps) { __u64 ExtAttrMask = 0; rc = CIFSGetExtAttr(xid, tcon, pSMBFile->fid.netfid, &ExtAttrBits, &ExtAttrMask); if (rc == 0) rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, (int __user *)arg); if (rc != EOPNOTSUPP) break; } #endif /* CONFIG_CIFS_POSIX */ rc = 0; if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) { /* add in the compressed bit */ ExtAttrBits = FS_COMPR_FL; rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE, (int __user *)arg); } break; case FS_IOC_SETFLAGS: if (pSMBFile == NULL) break; tcon = tlink_tcon(pSMBFile->tlink); /* caps = le64_to_cpu(tcon->fsUnixInfo.Capability); */ if (get_user(ExtAttrBits, (int __user *)arg)) { rc = -EFAULT; break; } /* * if (CIFS_UNIX_EXTATTR_CAP & caps) * rc = CIFSSetExtAttr(xid, tcon, * pSMBFile->fid.netfid, * extAttrBits, * &ExtAttrMask); * if (rc != EOPNOTSUPP) * break; */ /* Currently only flag we can set is compressed flag */ if ((ExtAttrBits & FS_COMPR_FL) == 0) break; /* Try to set compress flag */ if (tcon->ses->server->ops->set_compression) { rc = tcon->ses->server->ops->set_compression( xid, tcon, pSMBFile); cifs_dbg(FYI, "set compress flag rc %d\n", rc); } break; case CIFS_IOC_COPYCHUNK_FILE: rc = cifs_ioctl_copychunk(xid, filep, arg); break; case CIFS_QUERY_INFO: rc = cifs_ioctl_query_info(xid, filep, arg); break; case CIFS_IOC_SET_INTEGRITY: if (pSMBFile == NULL) break; tcon = tlink_tcon(pSMBFile->tlink); if (tcon->ses->server->ops->set_integrity) rc = tcon->ses->server->ops->set_integrity(xid, tcon, pSMBFile); else rc = -EOPNOTSUPP; break; case CIFS_IOC_GET_MNT_INFO: if (pSMBFile == NULL) break; tcon = tlink_tcon(pSMBFile->tlink); rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg); break; case CIFS_ENUMERATE_SNAPSHOTS: if (pSMBFile == NULL) break; if (arg == 0) { rc = -EINVAL; goto cifs_ioc_exit; } tcon = tlink_tcon(pSMBFile->tlink); if (tcon->ses->server->ops->enum_snapshots) rc = tcon->ses->server->ops->enum_snapshots(xid, tcon, pSMBFile, (void __user *)arg); else rc = -EOPNOTSUPP; break; case CIFS_DUMP_KEY: /* * Dump encryption keys. This is an old ioctl that only * handles AES-128-{CCM,GCM}. */ if (pSMBFile == NULL) break; if (!capable(CAP_SYS_ADMIN)) { rc = -EACCES; break; } tcon = tlink_tcon(pSMBFile->tlink); if (!smb3_encryption_required(tcon)) { rc = -EOPNOTSUPP; break; } pkey_inf.cipher_type = le16_to_cpu(tcon->ses->server->cipher_type); pkey_inf.Suid = tcon->ses->Suid; memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response, 16 /* SMB2_NTLMV2_SESSKEY_SIZE */); memcpy(pkey_inf.smb3decryptionkey, tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE); memcpy(pkey_inf.smb3encryptionkey, tcon->ses->smb3encryptionkey, SMB3_SIGN_KEY_SIZE); if (copy_to_user((void __user *)arg, &pkey_inf, sizeof(struct smb3_key_debug_info))) rc = -EFAULT; else rc = 0; break; case CIFS_DUMP_FULL_KEY: /* * Dump encryption keys (handles any key sizes) */ if (pSMBFile == NULL) break; if (!capable(CAP_SYS_ADMIN)) { rc = -EACCES; break; } tcon = tlink_tcon(pSMBFile->tlink); rc = cifs_dump_full_key(tcon, (void __user *)arg); break; case CIFS_IOC_NOTIFY: if (!S_ISDIR(inode->i_mode)) { /* Notify can only be done on directories */ rc = -EOPNOTSUPP; break; } cifs_sb = CIFS_SB(inode->i_sb); tlink = cifs_sb_tlink(cifs_sb); if (IS_ERR(tlink)) { rc = PTR_ERR(tlink); break; } tcon = tlink_tcon(tlink); if (tcon && tcon->ses->server->ops->notify) { rc = tcon->ses->server->ops->notify(xid, filep, (void __user *)arg); cifs_dbg(FYI, "ioctl notify rc %d\n", rc); } else rc = -EOPNOTSUPP; cifs_put_tlink(tlink); break; case CIFS_IOC_SHUTDOWN: rc = cifs_shutdown(inode->i_sb, arg); break; default: cifs_dbg(FYI, "unsupported ioctl\n"); break; } cifs_ioc_exit: free_xid(xid); return rc; }