// SPDX-License-Identifier: LGPL-2.1 /* * * Copyright (C) International Business Machines Corp., 2002,2011 * Etersoft, 2012 * Author(s): Steve French (sfrench@us.ibm.com) * Pavel Shilovsky (pshilovsky@samba.org) 2012 * */ #include #include "cifsglob.h" #include "cifsproto.h" #include "smb2proto.h" #include "cifs_debug.h" #include "cifs_unicode.h" #include "smb2status.h" #include "smb2glob.h" #include "nterr.h" static int check_smb2_hdr(struct smb2_hdr *shdr, __u64 mid) { __u64 wire_mid = le64_to_cpu(shdr->MessageId); /* * Make sure that this really is an SMB, that it is a response, * and that the message ids match. */ if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) && (mid == wire_mid)) { if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) return 0; else { /* only one valid case where server sends us request */ if (shdr->Command == SMB2_OPLOCK_BREAK) return 0; else cifs_dbg(VFS, "Received Request not response\n"); } } else { /* bad signature or mid */ if (shdr->ProtocolId != SMB2_PROTO_NUMBER) cifs_dbg(VFS, "Bad protocol string signature header %x\n", le32_to_cpu(shdr->ProtocolId)); if (mid != wire_mid) cifs_dbg(VFS, "Mids do not match: %llu and %llu\n", mid, wire_mid); } cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid); return 1; } /* * The following table defines the expected "StructureSize" of SMB2 responses * in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses. * * Note that commands are defined in smb2pdu.h in le16 but the array below is * indexed by command in host byte order */ static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { /* SMB2_NEGOTIATE */ cpu_to_le16(65), /* SMB2_SESSION_SETUP */ cpu_to_le16(9), /* SMB2_LOGOFF */ cpu_to_le16(4), /* SMB2_TREE_CONNECT */ cpu_to_le16(16), /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4), /* SMB2_CREATE */ cpu_to_le16(89), /* SMB2_CLOSE */ cpu_to_le16(60), /* SMB2_FLUSH */ cpu_to_le16(4), /* SMB2_READ */ cpu_to_le16(17), /* SMB2_WRITE */ cpu_to_le16(17), /* SMB2_LOCK */ cpu_to_le16(4), /* SMB2_IOCTL */ cpu_to_le16(49), /* BB CHECK this ... not listed in documentation */ /* SMB2_CANCEL */ cpu_to_le16(0), /* SMB2_ECHO */ cpu_to_le16(4), /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9), /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9), /* SMB2_QUERY_INFO */ cpu_to_le16(9), /* SMB2_SET_INFO */ cpu_to_le16(2), /* BB FIXME can also be 44 for lease break */ /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24) }; #define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_hdr) + sizeof(struct smb2_negotiate_rsp)) static __u32 get_neg_ctxt_len(struct smb2_hdr *hdr, __u32 len, __u32 non_ctxlen) { __u16 neg_count; __u32 nc_offset, size_of_pad_before_neg_ctxts; struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr; /* Negotiate contexts are only valid for latest dialect SMB3.11 */ neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount); if ((neg_count == 0) || (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID))) return 0; /* * if SPNEGO blob present (ie the RFC2478 GSS info which indicates * which security mechanisms the server supports) make sure that * the negotiate contexts start after it */ nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset); /* * non_ctxlen is at least shdr->StructureSize + pdu->StructureSize2 * and the latter is 1 byte bigger than the fix-sized area of the * NEGOTIATE response */ if (nc_offset + 1 < non_ctxlen) { pr_warn_once("Invalid negotiate context offset %d\n", nc_offset); return 0; } else if (nc_offset + 1 == non_ctxlen) { cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n"); size_of_pad_before_neg_ctxts = 0; } else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE) /* has padding, but no SPNEGO blob */ size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1; else size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen; /* Verify that at least minimal negotiate contexts fit within frame */ if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) { pr_warn_once("negotiate context goes beyond end\n"); return 0; } cifs_dbg(FYI, "length of negcontexts %d pad %d\n", len - nc_offset, size_of_pad_before_neg_ctxts); /* length of negcontexts including pad from end of sec blob to them */ return (len - nc_offset) + size_of_pad_before_neg_ctxts; } int smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr) { struct smb2_hdr *shdr = (struct smb2_hdr *)buf; struct smb2_pdu *pdu = (struct smb2_pdu *)shdr; __u64 mid; __u32 clc_len; /* calculated length */ int command; int pdu_size = sizeof(struct smb2_pdu); int hdr_size = sizeof(struct smb2_hdr); /* * Add function to do table lookup of StructureSize by command * ie Validate the wct via smb2_struct_sizes table above */ if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) { struct smb2_transform_hdr *thdr = (struct smb2_transform_hdr *)buf; struct cifs_ses *ses = NULL; /* decrypt frame now that it is completely read in */ spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &srvr->smb_ses_list, smb_ses_list) { if (ses->Suid == le64_to_cpu(thdr->SessionId)) break; } spin_unlock(&cifs_tcp_ses_lock); if (list_entry_is_head(ses, &srvr->smb_ses_list, smb_ses_list)) { cifs_dbg(VFS, "no decryption - session id not found\n"); return 1; } } mid = le64_to_cpu(shdr->MessageId); if (len < pdu_size) { if ((len >= hdr_size) && (shdr->Status != 0)) { pdu->StructureSize2 = 0; /* * As with SMB/CIFS, on some error cases servers may * not return wct properly */ return 0; } else { cifs_dbg(VFS, "Length less than SMB header size\n"); } return 1; } if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) { cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n", mid); return 1; } if (check_smb2_hdr(shdr, mid)) return 1; if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) { cifs_dbg(VFS, "Invalid structure size %u\n", le16_to_cpu(shdr->StructureSize)); return 1; } command = le16_to_cpu(shdr->Command); if (command >= NUMBER_OF_SMB2_COMMANDS) { cifs_dbg(VFS, "Invalid SMB2 command %d\n", command); return 1; } if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) { if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 || pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) { /* error packets have 9 byte structure size */ cifs_dbg(VFS, "Invalid response size %u for command %d\n", le16_to_cpu(pdu->StructureSize2), command); return 1; } else if (command == SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0) && (le16_to_cpu(pdu->StructureSize2) != 44) && (le16_to_cpu(pdu->StructureSize2) != 36)) { /* special case for SMB2.1 lease break message */ cifs_dbg(VFS, "Invalid response size %d for oplock break\n", le16_to_cpu(pdu->StructureSize2)); return 1; } } clc_len = smb2_calc_size(buf, srvr); if (shdr->Command == SMB2_NEGOTIATE) clc_len += get_neg_ctxt_len(shdr, len, clc_len); if (len != clc_len) { cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n", clc_len, len, mid); /* create failed on symlink */ if (command == SMB2_CREATE_HE && shdr->Status == STATUS_STOPPED_ON_SYMLINK) return 0; /* Windows 7 server returns 24 bytes more */ if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE) return 0; /* server can return one byte more due to implied bcc[0] */ if (clc_len == len + 1) return 0; /* * Some windows servers (win2016) will pad also the final * PDU in a compound to 8 bytes. */ if (((clc_len + 7) & ~7) == len) return 0; /* * MacOS server pads after SMB2.1 write response with 3 bytes * of junk. Other servers match RFC1001 len to actual * SMB2/SMB3 frame length (header + smb2 response specific data) * Some windows servers also pad up to 8 bytes when compounding. */ if (clc_len < len) return 0; pr_warn_once( "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n", len, clc_len, command, mid); return 1; } return 0; } /* * The size of the variable area depends on the offset and length fields * located in different fields for various SMB2 responses. SMB2 responses * with no variable length info, show an offset of zero for the offset field. */ static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = { /* SMB2_NEGOTIATE */ true, /* SMB2_SESSION_SETUP */ true, /* SMB2_LOGOFF */ false, /* SMB2_TREE_CONNECT */ false, /* SMB2_TREE_DISCONNECT */ false, /* SMB2_CREATE */ true, /* SMB2_CLOSE */ false, /* SMB2_FLUSH */ false, /* SMB2_READ */ true, /* SMB2_WRITE */ false, /* SMB2_LOCK */ false, /* SMB2_IOCTL */ true, /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */ /* SMB2_ECHO */ false, /* SMB2_QUERY_DIRECTORY */ true, /* SMB2_CHANGE_NOTIFY */ true, /* SMB2_QUERY_INFO */ true, /* SMB2_SET_INFO */ false, /* SMB2_OPLOCK_BREAK */ false }; /* * Returns the pointer to the beginning of the data area. Length of the data * area and the offset to it (from the beginning of the smb are also returned. */ char * smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *shdr) { *off = 0; *len = 0; /* error responses do not have data area */ if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED && (((struct smb2_err_rsp *)shdr)->StructureSize) == SMB2_ERROR_STRUCTURE_SIZE2) return NULL; /* * Following commands have data areas so we have to get the location * of the data buffer offset and data buffer length for the particular * command. */ switch (shdr->Command) { case SMB2_NEGOTIATE: *off = le16_to_cpu( ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset); *len = le16_to_cpu( ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength); break; case SMB2_SESSION_SETUP: *off = le16_to_cpu( ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset); *len = le16_to_cpu( ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength); break; case SMB2_CREATE: *off = le32_to_cpu( ((struct smb2_create_rsp *)shdr)->CreateContextsOffset); *len = le32_to_cpu( ((struct smb2_create_rsp *)shdr)->CreateContextsLength); break; case SMB2_QUERY_INFO: *off = le16_to_cpu( ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset); *len = le32_to_cpu( ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength); break; case SMB2_READ: /* TODO: is this a bug ? */ *off = ((struct smb2_read_rsp *)shdr)->DataOffset; *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength); break; case SMB2_QUERY_DIRECTORY: *off = le16_to_cpu( ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset); *len = le32_to_cpu( ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength); break; case SMB2_IOCTL: *off = le32_to_cpu( ((struct smb2_ioctl_rsp *)shdr)->OutputOffset); *len = le32_to_cpu( ((struct smb2_ioctl_rsp *)shdr)->OutputCount); break; case SMB2_CHANGE_NOTIFY: *off = le16_to_cpu( ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset); *len = le32_to_cpu( ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength); break; default: cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command)); break; } /* * Invalid length or offset probably means data area is invalid, but * we have little choice but to ignore the data area in this case. */ if (*off > 4096) { cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off); *len = 0; *off = 0; } else if (*off < 0) { cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n", *off); *off = 0; *len = 0; } else if (*len < 0) { cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n", *len); *len = 0; } else if (*len > 128 * 1024) { cifs_dbg(VFS, "data area larger than 128K: %d\n", *len); *len = 0; } /* return pointer to beginning of data area, ie offset from SMB start */ if ((*off != 0) && (*len != 0)) return (char *)shdr + *off; else return NULL; } /* * Calculate the size of the SMB message based on the fixed header * portion, the number of word parameters and the data portion of the message. */ unsigned int smb2_calc_size(void *buf, struct TCP_Server_Info *srvr) { struct smb2_pdu *pdu = (struct smb2_pdu *)buf; struct smb2_hdr *shdr = &pdu->hdr; int offset; /* the offset from the beginning of SMB to data area */ int data_length; /* the length of the variable length data area */ /* Structure Size has already been checked to make sure it is 64 */ int len = le16_to_cpu(shdr->StructureSize); /* * StructureSize2, ie length of fixed parameter area has already * been checked to make sure it is the correct length. */ len += le16_to_cpu(pdu->StructureSize2); if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false) goto calc_size_exit; smb2_get_data_area_len(&offset, &data_length, shdr); cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset); if (data_length > 0) { /* * Check to make sure that data area begins after fixed area, * Note that last byte of the fixed area is part of data area * for some commands, typically those with odd StructureSize, * so we must add one to the calculation. */ if (offset + 1 < len) { cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n", offset + 1, len); data_length = 0; } else { len = offset + data_length; } } calc_size_exit: cifs_dbg(FYI, "SMB2 len %d\n", len); return len; } /* Note: caller must free return buffer */ __le16 * cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb) { int len; const char *start_of_path; __le16 *to; int map_type; if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) map_type = SFM_MAP_UNI_RSVD; else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) map_type = SFU_MAP_UNI_RSVD; else map_type = NO_MAP_UNI_RSVD; /* Windows doesn't allow paths beginning with \ */ if (from[0] == '\\') start_of_path = from + 1; /* SMB311 POSIX extensions paths do not include leading slash */ else if (cifs_sb_master_tlink(cifs_sb) && cifs_sb_master_tcon(cifs_sb)->posix_extensions && (from[0] == '/')) { start_of_path = from + 1; } else start_of_path = from; to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len, cifs_sb->local_nls, map_type); return to; } __le32 smb2_get_lease_state(struct cifsInodeInfo *cinode) { __le32 lease = 0; if (CIFS_CACHE_WRITE(cinode)) lease |= SMB2_LEASE_WRITE_CACHING; if (CIFS_CACHE_HANDLE(cinode)) lease |= SMB2_LEASE_HANDLE_CACHING; if (CIFS_CACHE_READ(cinode)) lease |= SMB2_LEASE_READ_CACHING; return lease; } struct smb2_lease_break_work { struct work_struct lease_break; struct tcon_link *tlink; __u8 lease_key[16]; __le32 lease_state; }; static void cifs_ses_oplock_break(struct work_struct *work) { struct smb2_lease_break_work *lw = container_of(work, struct smb2_lease_break_work, lease_break); int rc = 0; rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key, lw->lease_state); cifs_dbg(FYI, "Lease release rc %d\n", rc); cifs_put_tlink(lw->tlink); kfree(lw); } static void smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key, __le32 new_lease_state) { struct smb2_lease_break_work *lw; lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL); if (!lw) { cifs_put_tlink(tlink); return; } INIT_WORK(&lw->lease_break, cifs_ses_oplock_break); lw->tlink = tlink; lw->lease_state = new_lease_state; memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE); queue_work(cifsiod_wq, &lw->lease_break); } static bool smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp) { __u8 lease_state; struct cifsFileInfo *cfile; struct cifsInodeInfo *cinode; int ack_req = le32_to_cpu(rsp->Flags & SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); lease_state = le32_to_cpu(rsp->NewLeaseState); list_for_each_entry(cfile, &tcon->openFileList, tlist) { cinode = CIFS_I(d_inode(cfile->dentry)); if (memcmp(cinode->lease_key, rsp->LeaseKey, SMB2_LEASE_KEY_SIZE)) continue; cifs_dbg(FYI, "found in the open list\n"); cifs_dbg(FYI, "lease key match, lease break 0x%x\n", lease_state); if (ack_req) cfile->oplock_break_cancelled = false; else cfile->oplock_break_cancelled = true; set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); cfile->oplock_epoch = le16_to_cpu(rsp->Epoch); cfile->oplock_level = lease_state; cifs_queue_oplock_break(cfile); return true; } return false; } static struct cifs_pending_open * smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp) { __u8 lease_state = le32_to_cpu(rsp->NewLeaseState); int ack_req = le32_to_cpu(rsp->Flags & SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED); struct cifs_pending_open *open; struct cifs_pending_open *found = NULL; list_for_each_entry(open, &tcon->pending_opens, olist) { if (memcmp(open->lease_key, rsp->LeaseKey, SMB2_LEASE_KEY_SIZE)) continue; if (!found && ack_req) { found = open; } cifs_dbg(FYI, "found in the pending open list\n"); cifs_dbg(FYI, "lease key match, lease break 0x%x\n", lease_state); open->oplock = lease_state; } return found; } static bool smb2_is_valid_lease_break(char *buffer) { struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer; struct TCP_Server_Info *server; struct cifs_ses *ses; struct cifs_tcon *tcon; struct cifs_pending_open *open; cifs_dbg(FYI, "Checking for lease break\n"); /* look up tcon based on tid & uid */ spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { spin_lock(&tcon->open_file_lock); cifs_stats_inc( &tcon->stats.cifs_stats.num_oplock_brks); if (smb2_tcon_has_lease(tcon, rsp)) { spin_unlock(&tcon->open_file_lock); spin_unlock(&cifs_tcp_ses_lock); return true; } open = smb2_tcon_find_pending_open_lease(tcon, rsp); if (open) { __u8 lease_key[SMB2_LEASE_KEY_SIZE]; struct tcon_link *tlink; tlink = cifs_get_tlink(open->tlink); memcpy(lease_key, open->lease_key, SMB2_LEASE_KEY_SIZE); spin_unlock(&tcon->open_file_lock); spin_unlock(&cifs_tcp_ses_lock); smb2_queue_pending_open_break(tlink, lease_key, rsp->NewLeaseState); return true; } spin_unlock(&tcon->open_file_lock); if (tcon->crfid.is_valid && !memcmp(rsp->LeaseKey, tcon->crfid.fid->lease_key, SMB2_LEASE_KEY_SIZE)) { tcon->crfid.time = 0; INIT_WORK(&tcon->crfid.lease_break, smb2_cached_lease_break); queue_work(cifsiod_wq, &tcon->crfid.lease_break); spin_unlock(&cifs_tcp_ses_lock); return true; } } } } spin_unlock(&cifs_tcp_ses_lock); cifs_dbg(FYI, "Can not process lease break - no lease matched\n"); return false; } bool smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server) { struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer; struct cifs_ses *ses; struct cifs_tcon *tcon; struct cifsInodeInfo *cinode; struct cifsFileInfo *cfile; cifs_dbg(FYI, "Checking for oplock break\n"); if (rsp->hdr.Command != SMB2_OPLOCK_BREAK) return false; if (rsp->StructureSize != smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) { if (le16_to_cpu(rsp->StructureSize) == 44) return smb2_is_valid_lease_break(buffer); else return false; } cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel); /* look up tcon based on tid & uid */ spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { spin_lock(&tcon->open_file_lock); list_for_each_entry(cfile, &tcon->openFileList, tlist) { if (rsp->PersistentFid != cfile->fid.persistent_fid || rsp->VolatileFid != cfile->fid.volatile_fid) continue; cifs_dbg(FYI, "file id match, oplock break\n"); cifs_stats_inc( &tcon->stats.cifs_stats.num_oplock_brks); cinode = CIFS_I(d_inode(cfile->dentry)); spin_lock(&cfile->file_info_lock); if (!CIFS_CACHE_WRITE(cinode) && rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE) cfile->oplock_break_cancelled = true; else cfile->oplock_break_cancelled = false; set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); cfile->oplock_epoch = 0; cfile->oplock_level = rsp->OplockLevel; spin_unlock(&cfile->file_info_lock); cifs_queue_oplock_break(cfile); spin_unlock(&tcon->open_file_lock); spin_unlock(&cifs_tcp_ses_lock); return true; } spin_unlock(&tcon->open_file_lock); } } spin_unlock(&cifs_tcp_ses_lock); cifs_dbg(FYI, "No file id matched, oplock break ignored\n"); return true; } void smb2_cancelled_close_fid(struct work_struct *work) { struct close_cancelled_open *cancelled = container_of(work, struct close_cancelled_open, work); struct cifs_tcon *tcon = cancelled->tcon; int rc; if (cancelled->mid) cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llu\n", cancelled->mid); else cifs_tcon_dbg(VFS, "Close interrupted close\n"); rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid, cancelled->fid.volatile_fid); if (rc) cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc); cifs_put_tcon(tcon); kfree(cancelled); } /* * Caller should already has an extra reference to @tcon * This function is used to queue work to close a handle to prevent leaks * on the server. * We handle two cases. If an open was interrupted after we sent the * SMB2_CREATE to the server but before we processed the reply, and second * if a close was interrupted before we sent the SMB2_CLOSE to the server. */ static int __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid, __u64 persistent_fid, __u64 volatile_fid) { struct close_cancelled_open *cancelled; cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC); if (!cancelled) return -ENOMEM; cancelled->fid.persistent_fid = persistent_fid; cancelled->fid.volatile_fid = volatile_fid; cancelled->tcon = tcon; cancelled->cmd = cmd; cancelled->mid = mid; INIT_WORK(&cancelled->work, smb2_cancelled_close_fid); WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false); return 0; } int smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid, __u64 volatile_fid) { int rc; cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); spin_lock(&cifs_tcp_ses_lock); if (tcon->tc_count <= 0) { struct TCP_Server_Info *server = NULL; WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative"); spin_unlock(&cifs_tcp_ses_lock); if (tcon->ses) server = tcon->ses->server; cifs_server_dbg(FYI, "tid=%u: tcon is closing, skipping async close retry of fid %llu %llu\n", tcon->tid, persistent_fid, volatile_fid); return 0; } tcon->tc_count++; spin_unlock(&cifs_tcp_ses_lock); rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0, persistent_fid, volatile_fid); if (rc) cifs_put_tcon(tcon); return rc; } int smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server) { struct smb2_hdr *hdr = mid->resp_buf; struct smb2_create_rsp *rsp = mid->resp_buf; struct cifs_tcon *tcon; int rc; if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || hdr->Command != SMB2_CREATE || hdr->Status != STATUS_SUCCESS) return 0; tcon = smb2_find_smb_tcon(server, le64_to_cpu(hdr->SessionId), le32_to_cpu(hdr->Id.SyncId.TreeId)); if (!tcon) return -ENOENT; rc = __smb2_handle_cancelled_cmd(tcon, le16_to_cpu(hdr->Command), le64_to_cpu(hdr->MessageId), rsp->PersistentFileId, rsp->VolatileFileId); if (rc) cifs_put_tcon(tcon); return rc; } /** * smb311_update_preauth_hash - update @ses hash with the packet data in @iov * * Assumes @iov does not contain the rfc1002 length and iov[0] has the * SMB2 header. * * @ses: server session structure * @server: pointer to server info * @iov: array containing the SMB request we will send to the server * @nvec: number of array entries for the iov */ int smb311_update_preauth_hash(struct cifs_ses *ses, struct TCP_Server_Info *server, struct kvec *iov, int nvec) { int i, rc; struct sdesc *d; struct smb2_hdr *hdr; hdr = (struct smb2_hdr *)iov[0].iov_base; /* neg prot are always taken */ if (hdr->Command == SMB2_NEGOTIATE) goto ok; /* * If we process a command which wasn't a negprot it means the * neg prot was already done, so the server dialect was set * and we can test it. Preauth requires 3.1.1 for now. */ if (server->dialect != SMB311_PROT_ID) return 0; if (hdr->Command != SMB2_SESSION_SETUP) return 0; /* skip last sess setup response */ if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR) && (hdr->Status == NT_STATUS_OK || (hdr->Status != cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED)))) return 0; ok: rc = smb311_crypto_shash_allocate(server); if (rc) return rc; d = server->secmech.sdescsha512; rc = crypto_shash_init(&d->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__); return rc; } rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash, SMB2_PREAUTH_HASH_SIZE); if (rc) { cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__); return rc; } for (i = 0; i < nvec; i++) { rc = crypto_shash_update(&d->shash, iov[i].iov_base, iov[i].iov_len); if (rc) { cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__); return rc; } } rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash); if (rc) { cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n", __func__); return rc; } return 0; }