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143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/*
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*
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* cygwin_util.c
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*
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* Author: Corinna Vinschen <vinschen@cygnus.com>
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*
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* Copyright (c) 2000 Corinna Vinschen <vinschen@cygnus.com>, Duisburg, Germany
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* All rights reserved
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*
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* Created: Sat Sep 02 12:17:00 2000 cv
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*
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* This file contains functions for forcing opened file descriptors to
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* binary mode on Windows systems.
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*/
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#include "includes.h"
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RCSID("$Id: bsd-cygwin_util.c,v 1.5 2001/07/18 16:19:49 mouring Exp $");
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#ifdef HAVE_CYGWIN
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/utsname.h>
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#include <sys/vfs.h>
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#include <windows.h>
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#define is_winnt (GetVersion() < 0x80000000)
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#define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec"))
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#define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea"))
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#if defined(open) && open == binary_open
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# undef open
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#endif
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#if defined(pipe) && open == binary_pipe
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# undef pipe
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#endif
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int binary_open(const char *filename, int flags, ...)
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{
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va_list ap;
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mode_t mode;
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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return open(filename, flags | O_BINARY, mode);
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}
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int binary_pipe(int fd[2])
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{
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int ret = pipe(fd);
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if (!ret) {
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setmode (fd[0], O_BINARY);
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setmode (fd[1], O_BINARY);
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}
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return ret;
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}
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int check_nt_auth(int pwd_authenticated, uid_t uid)
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{
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/*
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* The only authentication which is able to change the user
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* context on NT systems is the password authentication. So
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* we deny all requsts for changing the user context if another
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* authentication method is used.
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*
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* This doesn't apply to Cygwin versions >= 1.3.2 anymore which
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* uses the undocumented NtCreateToken() call to create a user
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* token if the process has the appropriate privileges and if
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* CYGWIN ntsec setting is on.
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*/
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static int has_create_token = -1;
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if (is_winnt) {
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if (has_create_token < 0) {
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struct utsname uts;
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int major_high = 0, major_low = 0, minor = 0;
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char *cygwin = getenv("CYGWIN");
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has_create_token = 0;
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if (ntsec_on(cygwin) && !uname(&uts)) {
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sscanf(uts.release, "%d.%d.%d",
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&major_high, &major_low, &minor);
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if (major_high > 1 ||
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(major_high == 1 && (major_low > 3 ||
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(major_low == 3 && minor >= 2))))
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has_create_token = 1;
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}
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}
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if (has_create_token < 1 &&
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!pwd_authenticated && geteuid() != uid)
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return 0;
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}
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return 1;
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}
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int check_ntsec(const char *filename)
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{
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char *cygwin;
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int allow_ntea = 0;
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int allow_ntsec = 0;
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struct statfs fsstat;
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/* Windows 95/98/ME don't support file system security at all. */
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if (!is_winnt)
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return 0;
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/* Evaluate current CYGWIN settings. */
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cygwin = getenv("CYGWIN");
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allow_ntea = ntea_on(cygwin);
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allow_ntsec = ntsec_on(cygwin);
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/*
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* `ntea' is an emulation of POSIX attributes. It doesn't support
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* real file level security as ntsec on NTFS file systems does
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* but it supports FAT filesystems. `ntea' is minimum requirement
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* for security checks.
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*/
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if (allow_ntea)
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return 1;
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/*
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* Retrieve file system flags. In Cygwin, file system flags are
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* copied to f_type which has no meaning in Win32 itself.
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*/
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if (statfs(filename, &fsstat))
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return 1;
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/*
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* Only file systems supporting ACLs are able to set permissions.
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* `ntsec' is the setting in Cygwin which switches using of NTFS
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* ACLs to support POSIX permissions on files.
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*/
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if (fsstat.f_type & FS_PERSISTENT_ACLS)
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return allow_ntsec;
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return 0;
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}
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#endif /* HAVE_CYGWIN */
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