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Diffstat (limited to 'openbsd-compat/bsd-cygwin_util.c')
-rw-r--r--openbsd-compat/bsd-cygwin_util.c105
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diff --git a/openbsd-compat/bsd-cygwin_util.c b/openbsd-compat/bsd-cygwin_util.c
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1/*
2 *
3 * cygwin_util.c
4 *
5 * Author: Corinna Vinschen <vinschen@cygnus.com>
6 *
7 * Copyright (c) 2000 Corinna Vinschen <vinschen@cygnus.com>, Duisburg, Germany
8 * All rights reserved
9 *
10 * Created: Sat Sep 02 12:17:00 2000 cv
11 *
12 * This file contains functions for forcing opened file descriptors to
13 * binary mode on Windows systems.
14 */
15
16#include "config.h"
17
18#ifdef HAVE_CYGWIN
19
20#include <fcntl.h>
21#include <io.h>
22#include <stdlib.h>
23#include <sys/vfs.h>
24#include <windows.h>
25#define is_winnt (GetVersion() < 0x80000000)
26
27int binary_open(const char *filename, int flags, mode_t mode)
28{
29 return open(filename, flags | O_BINARY, mode);
30}
31
32int binary_pipe(int fd[2])
33{
34 int ret = pipe(fd);
35
36 if (!ret) {
37 setmode (fd[0], O_BINARY);
38 setmode (fd[1], O_BINARY);
39 }
40 return ret;
41}
42
43int check_nt_auth(int pwd_authenticated, uid_t uid)
44{
45 /*
46 * The only authentication which is able to change the user
47 * context on NT systems is the password authentication. So
48 * we deny all requsts for changing the user context if another
49 * authentication method is used.
50 * This may change in future when a special openssh
51 * subauthentication package is available.
52 */
53 if (is_winnt && !pwd_authenticated && geteuid() != uid)
54 return 0;
55
56 return 1;
57}
58
59int check_ntsec(const char *filename)
60{
61 char *cygwin;
62 int allow_ntea = 0;
63 int allow_ntsec = 0;
64 struct statfs fsstat;
65
66 /* Windows 95/98/ME don't support file system security at all. */
67 if (!is_winnt)
68 return 0;
69
70 /* Evaluate current CYGWIN settings. */
71 if ((cygwin = getenv("CYGWIN")) != NULL) {
72 if (strstr(cygwin, "ntea") && !strstr(cygwin, "nontea"))
73 allow_ntea = 1;
74 if (strstr(cygwin, "ntsec") && !strstr(cygwin, "nontsec"))
75 allow_ntsec = 1;
76 }
77
78 /*
79 * `ntea' is an emulation of POSIX attributes. It doesn't support
80 * real file level security as ntsec on NTFS file systems does
81 * but it supports FAT filesystems. `ntea' is minimum requirement
82 * for security checks.
83 */
84 if (allow_ntea)
85 return 1;
86
87 /*
88 * Retrieve file system flags. In Cygwin, file system flags are
89 * copied to f_type which has no meaning in Win32 itself.
90 */
91 if (statfs(filename, &fsstat))
92 return 1;
93
94 /*
95 * Only file systems supporting ACLs are able to set permissions.
96 * `ntsec' is the setting in Cygwin which switches using of NTFS
97 * ACLs to support POSIX permissions on files.
98 */
99 if (fsstat.f_type & FS_PERSISTENT_ACLS)
100 return allow_ntsec;
101
102 return 0;
103}
104
105#endif /* HAVE_CYGWIN */