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449 lines
14 KiB
C
449 lines
14 KiB
C
/* NFSv4.1 client for Windows
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* Copyright © 2012 The Regents of the University of Michigan
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*
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* Olga Kornievskaia <aglo@umich.edu>
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* Casey Bodley <cbodley@umich.edu>
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* without any warranty; without even the implied warranty of merchantability
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* or fitness for a particular purpose. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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*/
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#include <windows.h>
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#include <strsafe.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wincrypt.h> /* for Crypt*() functions */
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#include "daemon_debug.h"
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#include "util.h"
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#include "nfs41_ops.h"
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int safe_read(unsigned char **pos, uint32_t *remaining, void *dest, uint32_t dest_len)
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{
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if (*remaining < dest_len)
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return ERROR_BUFFER_OVERFLOW;
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CopyMemory(dest, *pos, dest_len);
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*pos += dest_len;
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*remaining -= dest_len;
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return 0;
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}
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int safe_write(unsigned char **pos, uint32_t *remaining, void *src, uint32_t src_len)
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{
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if (*remaining < src_len)
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return ERROR_BUFFER_OVERFLOW;
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CopyMemory(*pos, src, src_len);
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*pos += src_len;
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*remaining -= src_len;
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return 0;
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}
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int get_name(unsigned char **pos, uint32_t *remaining, const char **out_name)
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{
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int status;
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USHORT len;
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status = safe_read(pos, remaining, &len, sizeof(USHORT));
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if (status) goto out;
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if (*remaining < len) {
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status = ERROR_BUFFER_OVERFLOW;
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goto out;
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}
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*out_name = (const char*)*pos;
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*pos += len;
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*remaining -= len;
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out:
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return status;
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}
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const char* strip_path(
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IN const char *path,
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OUT uint32_t *len_out)
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{
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const char *name = strrchr(path, '\\');
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name = name ? name + 1 : path;
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if (len_out)
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*len_out = (uint32_t)strlen(name);
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return name;
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}
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uint32_t max_read_size(
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IN const nfs41_session *session,
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IN const nfs41_fh *fh)
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{
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const uint32_t maxresponse = session->fore_chan_attrs.ca_maxresponsesize;
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return (uint32_t)min(fh->superblock->maxread, maxresponse - READ_OVERHEAD);
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}
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uint32_t max_write_size(
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IN const nfs41_session *session,
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IN const nfs41_fh *fh)
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{
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const uint32_t maxrequest = session->fore_chan_attrs.ca_maxrequestsize;
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return (uint32_t)min(fh->superblock->maxwrite, maxrequest - WRITE_OVERHEAD);
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}
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bool_t verify_write(
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IN nfs41_write_verf *verf,
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IN OUT enum stable_how4 *stable)
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{
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if (verf->committed != UNSTABLE4) {
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*stable = verf->committed;
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dprintf(3, "verify_write: committed to stable storage\n");
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return 1;
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}
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if (*stable != UNSTABLE4) {
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memcpy(verf->expected, verf->verf, NFS4_VERIFIER_SIZE);
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*stable = UNSTABLE4;
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dprintf(3, "verify_write: first unstable write, saving verifier\n");
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return 1;
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}
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if (memcmp(verf->expected, verf->verf, NFS4_VERIFIER_SIZE) == 0) {
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dprintf(3, "verify_write: verifier matches expected\n");
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return 1;
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}
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dprintf(2, "verify_write: verifier changed; writes have been lost!\n");
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return 0;
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}
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bool_t verify_commit(
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IN nfs41_write_verf *verf)
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{
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if (memcmp(verf->expected, verf->verf, NFS4_VERIFIER_SIZE) == 0) {
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dprintf(3, "verify_commit: verifier matches expected\n");
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return 1;
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}
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dprintf(2, "verify_commit: verifier changed; writes have been lost!\n");
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return 0;
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}
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ULONG nfs_file_info_to_attributes(
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IN const nfs41_file_info *info)
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{
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ULONG attrs = 0;
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if (info->type == NF4DIR)
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attrs |= FILE_ATTRIBUTE_DIRECTORY;
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else if (info->type == NF4LNK) {
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attrs |= FILE_ATTRIBUTE_REPARSE_POINT;
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if (info->symlink_dir)
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attrs |= FILE_ATTRIBUTE_DIRECTORY;
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} else if (info->type != NF4REG)
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dprintf(1, "unhandled file type %d, defaulting to NF4REG\n",
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info->type);
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if (info->mode == 0444) /* XXX: 0444 for READONLY */
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attrs |= FILE_ATTRIBUTE_READONLY;
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if (info->hidden) attrs |= FILE_ATTRIBUTE_HIDDEN;
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if (info->system) attrs |= FILE_ATTRIBUTE_SYSTEM;
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if (info->archive) attrs |= FILE_ATTRIBUTE_ARCHIVE;
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// FILE_ATTRIBUTE_NORMAL attribute is only set if no other attributes are present.
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// all other override this value.
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return attrs ? attrs : FILE_ATTRIBUTE_NORMAL;
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}
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void nfs_to_basic_info(
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IN const nfs41_file_info *info,
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OUT PFILE_BASIC_INFO basic_out)
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{
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nfs_time_to_file_time(&info->time_create, &basic_out->CreationTime);
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nfs_time_to_file_time(&info->time_access, &basic_out->LastAccessTime);
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nfs_time_to_file_time(&info->time_modify, &basic_out->LastWriteTime);
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/* XXX: was using 'change' attr, but that wasn't giving a time */
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nfs_time_to_file_time(&info->time_modify, &basic_out->ChangeTime);
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basic_out->FileAttributes = nfs_file_info_to_attributes(info);
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}
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void nfs_to_standard_info(
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IN const nfs41_file_info *info,
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OUT PFILE_STANDARD_INFO std_out)
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{
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const ULONG FileAttributes = nfs_file_info_to_attributes(info);
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std_out->AllocationSize.QuadPart =
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std_out->EndOfFile.QuadPart = (LONGLONG)info->size;
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std_out->NumberOfLinks = info->numlinks;
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std_out->DeletePending = FALSE;
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std_out->Directory = FileAttributes & FILE_ATTRIBUTE_DIRECTORY ?
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TRUE : FALSE;
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}
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void nfs_to_network_openinfo(
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IN const nfs41_file_info *info,
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OUT PFILE_NETWORK_OPEN_INFORMATION net_out)
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{
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nfs_time_to_file_time(&info->time_create, &net_out->CreationTime);
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nfs_time_to_file_time(&info->time_access, &net_out->LastAccessTime);
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nfs_time_to_file_time(&info->time_modify, &net_out->LastWriteTime);
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/* XXX: was using 'change' attr, but that wasn't giving a time */
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nfs_time_to_file_time(&info->time_modify, &net_out->ChangeTime);
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net_out->AllocationSize.QuadPart =
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net_out->EndOfFile.QuadPart = (LONGLONG)info->size;
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net_out->FileAttributes = nfs_file_info_to_attributes(info);
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}
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void get_file_time(
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OUT PLARGE_INTEGER file_time)
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{
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GetSystemTimeAsFileTime((LPFILETIME)file_time);
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}
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void get_nfs_time(
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OUT nfstime4 *nfs_time)
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{
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LARGE_INTEGER file_time;
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get_file_time(&file_time);
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file_time_to_nfs_time(&file_time, nfs_time);
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}
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bool_t multi_addr_find(
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IN const multi_addr4 *addrs,
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IN const netaddr4 *addr,
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OUT OPTIONAL uint32_t *index_out)
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{
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uint32_t i;
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for (i = 0; i < addrs->count; i++) {
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const netaddr4 *saddr = &addrs->arr[i];
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if (!strncmp(saddr->netid, addr->netid, NFS41_NETWORK_ID_LEN) &&
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!strncmp(saddr->uaddr, addr->uaddr, NFS41_UNIVERSAL_ADDR_LEN)) {
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if (index_out) *index_out = i;
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return 1;
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}
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}
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return 0;
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}
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int nfs_to_windows_error(int status, int default_error)
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{
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/* make sure this is actually an nfs error */
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if (status < 0 || (status > 70 && status < 10001) || status > 10087) {
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eprintf("nfs_to_windows_error called with non-nfs "
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"error code %d; returning the error as is\n", status);
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return status;
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}
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switch (status) {
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case NFS4_OK: return NO_ERROR;
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case NFS4ERR_PERM: return ERROR_ACCESS_DENIED;
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case NFS4ERR_NOENT: return ERROR_FILE_NOT_FOUND;
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case NFS4ERR_IO: return ERROR_NET_WRITE_FAULT;
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case NFS4ERR_ACCESS: return ERROR_ACCESS_DENIED;
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case NFS4ERR_EXIST: return ERROR_FILE_EXISTS;
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case NFS4ERR_XDEV: return ERROR_NOT_SAME_DEVICE;
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case NFS4ERR_INVAL: return ERROR_INVALID_PARAMETER;
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case NFS4ERR_FBIG: return ERROR_FILE_TOO_LARGE;
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case NFS4ERR_NOSPC: return ERROR_DISK_FULL;
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case NFS4ERR_ROFS: return ERROR_NETWORK_ACCESS_DENIED;
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case NFS4ERR_MLINK: return ERROR_TOO_MANY_LINKS;
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case NFS4ERR_NAMETOOLONG: return ERROR_FILENAME_EXCED_RANGE;
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case NFS4ERR_STALE: return ERROR_NETNAME_DELETED;
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case NFS4ERR_NOTEMPTY: return ERROR_NOT_EMPTY;
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case NFS4ERR_DENIED: return ERROR_LOCK_FAILED;
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case NFS4ERR_TOOSMALL: return ERROR_BUFFER_OVERFLOW;
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case NFS4ERR_LOCKED: return ERROR_LOCK_VIOLATION;
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case NFS4ERR_SHARE_DENIED: return ERROR_SHARING_VIOLATION;
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case NFS4ERR_LOCK_RANGE: return ERROR_NOT_LOCKED;
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case NFS4ERR_ATTRNOTSUPP: return ERROR_NOT_SUPPORTED;
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case NFS4ERR_OPENMODE: return ERROR_ACCESS_DENIED;
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case NFS4ERR_LOCK_NOTSUPP: return ERROR_ATOMIC_LOCKS_NOT_SUPPORTED;
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case NFS4ERR_BADCHAR:
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case NFS4ERR_BADNAME: return ERROR_INVALID_NAME;
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case NFS4ERR_NOTDIR:
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case NFS4ERR_ISDIR:
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case NFS4ERR_SYMLINK:
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case NFS4ERR_WRONG_TYPE: return ERROR_INVALID_PARAMETER;
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case NFS4ERR_EXPIRED:
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case NFS4ERR_NOFILEHANDLE:
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case NFS4ERR_OLD_STATEID:
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case NFS4ERR_BAD_STATEID:
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case NFS4ERR_ADMIN_REVOKED: return ERROR_FILE_INVALID;
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case NFS4ERR_WRONGSEC: return ERROR_ACCESS_DENIED;
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default:
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dprintf(1, "nfs error %s not mapped to windows error; "
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"returning default error %d\n",
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nfs_error_string(status), default_error);
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return default_error;
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}
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}
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int map_symlink_errors(int status)
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{
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switch (status) {
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case NFS4ERR_BADCHAR:
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case NFS4ERR_BADNAME: return ERROR_INVALID_REPARSE_DATA;
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case NFS4ERR_WRONG_TYPE: return ERROR_NOT_A_REPARSE_POINT;
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case NFS4ERR_ACCESS: return ERROR_ACCESS_DENIED;
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case NFS4ERR_NOTEMPTY: return ERROR_NOT_EMPTY;
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default: return nfs_to_windows_error(status, ERROR_BAD_NET_RESP);
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}
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}
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bool_t next_component(
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IN const char *path,
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IN const char *path_end,
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OUT nfs41_component *component)
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{
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const char *component_end;
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component->name = next_non_delimiter(path, path_end);
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component_end = next_delimiter(component->name, path_end);
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component->len = (unsigned short)(component_end - component->name);
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return component->len > 0;
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}
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bool_t last_component(
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IN const char *path,
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IN const char *path_end,
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OUT nfs41_component *component)
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{
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const char *component_end = prev_delimiter(path_end, path);
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component->name = prev_non_delimiter(component_end, path);
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component->name = prev_delimiter(component->name, path);
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component->name = next_non_delimiter(component->name, component_end);
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component->len = (unsigned short)(component_end - component->name);
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return component->len > 0;
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}
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bool_t is_last_component(
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IN const char *path,
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IN const char *path_end)
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{
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path = next_delimiter(path, path_end);
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return next_non_delimiter(path, path_end) == path_end;
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}
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void abs_path_copy(
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OUT nfs41_abs_path *dst,
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IN const nfs41_abs_path *src)
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{
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dst->len = src->len;
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StringCchCopyNA(dst->path, NFS41_MAX_PATH_LEN, src->path, dst->len);
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}
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void path_fh_init(
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OUT nfs41_path_fh *file,
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IN nfs41_abs_path *path)
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{
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file->path = path;
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last_component(path->path, path->path + path->len, &file->name);
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}
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void fh_copy(
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OUT nfs41_fh *dst,
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IN const nfs41_fh *src)
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{
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dst->fileid = src->fileid;
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dst->superblock = src->superblock;
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dst->len = src->len;
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memcpy(dst->fh, src->fh, dst->len);
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}
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void path_fh_copy(
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OUT nfs41_path_fh *dst,
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IN const nfs41_path_fh *src)
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{
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dst->path = src->path;
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if (dst->path) {
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const size_t name_start = src->name.name - src->path->path;
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dst->name.name = dst->path->path + name_start;
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dst->name.len = src->name.len;
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} else {
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dst->name.name = NULL;
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dst->name.len = 0;
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}
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fh_copy(&dst->fh, &src->fh);
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}
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int create_silly_rename(
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IN nfs41_abs_path *path,
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IN const nfs41_fh *fh,
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OUT nfs41_component *silly)
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{
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HCRYPTPROV context;
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HCRYPTHASH hash;
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PBYTE buffer;
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DWORD length;
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const char *end = path->path + NFS41_MAX_PATH_LEN;
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const unsigned short extra_len = 2 + 16; //md5 is 16
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char name[NFS41_MAX_COMPONENT_LEN+1];
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unsigned char fhmd5[17] = { 0 };
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char *tmp;
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int status = NO_ERROR, i;
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if (path->len + extra_len >= NFS41_MAX_PATH_LEN) {
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status = ERROR_FILENAME_EXCED_RANGE;
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goto out;
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}
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/* set up the md5 hash generator */
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if (!CryptAcquireContext(&context, NULL, NULL,
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PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
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status = GetLastError();
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eprintf("CryptAcquireContext() failed with %d\n", status);
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goto out;
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}
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if (!CryptCreateHash(context, CALG_MD5, 0, 0, &hash)) {
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status = GetLastError();
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eprintf("CryptCreateHash() failed with %d\n", status);
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goto out_context;
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}
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if (!CryptHashData(hash, (const BYTE*)fh->fh, (DWORD)fh->len, 0)) {
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status = GetLastError();
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eprintf("CryptHashData() failed with %d\n", status);
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goto out_hash;
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}
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/* extract the hash buffer */
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buffer = (PBYTE)fhmd5;
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length = 16;
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if (!CryptGetHashParam(hash, HP_HASHVAL, buffer, &length, 0)) {
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status = GetLastError();
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eprintf("CryptGetHashParam(val) failed with %d\n", status);
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goto out_hash;
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}
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last_component(path->path, path->path + path->len, silly);
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StringCchCopyNA(name, NFS41_MAX_COMPONENT_LEN+1, silly->name, silly->len);
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tmp = (char*)silly->name;
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StringCchPrintf(tmp, end - tmp, ".%s.", name);
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tmp += silly->len + 2;
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for (i = 0; i < 16; i++, tmp++)
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StringCchPrintf(tmp, end - tmp, "%x", fhmd5[i]);
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path->len = path->len + extra_len;
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silly->len = silly->len + extra_len;
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out_hash:
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CryptDestroyHash(hash);
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out_context:
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CryptReleaseContext(context, 0);
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out:
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return status;
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}
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