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3c0ef626 | 1 | /* |
3c0ef626 | 2 | * cygwin_util.c |
3 | * | |
700318f3 | 4 | * Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com> |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
3c0ef626 | 14 | * |
700318f3 | 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
3c0ef626 | 25 | * |
26 | * Created: Sat Sep 02 12:17:00 2000 cv | |
27 | * | |
28 | * This file contains functions for forcing opened file descriptors to | |
29 | * binary mode on Windows systems. | |
30 | */ | |
31 | ||
32 | #include "includes.h" | |
33 | ||
34 | RCSID("$Id$"); | |
35 | ||
36 | #ifdef HAVE_CYGWIN | |
37 | ||
38 | #include <fcntl.h> | |
39 | #include <stdlib.h> | |
40 | #include <sys/utsname.h> | |
41 | #include <sys/vfs.h> | |
42 | #include <windows.h> | |
43 | #define is_winnt (GetVersion() < 0x80000000) | |
44 | ||
45 | #define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec")) | |
46 | #define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea")) | |
47 | ||
48 | #if defined(open) && open == binary_open | |
49 | # undef open | |
50 | #endif | |
51 | #if defined(pipe) && open == binary_pipe | |
52 | # undef pipe | |
53 | #endif | |
54 | ||
55 | int binary_open(const char *filename, int flags, ...) | |
56 | { | |
57 | va_list ap; | |
58 | mode_t mode; | |
59 | ||
60 | va_start(ap, flags); | |
61 | mode = va_arg(ap, mode_t); | |
62 | va_end(ap); | |
63 | return open(filename, flags | O_BINARY, mode); | |
64 | } | |
65 | ||
66 | int binary_pipe(int fd[2]) | |
67 | { | |
68 | int ret = pipe(fd); | |
69 | ||
70 | if (!ret) { | |
71 | setmode (fd[0], O_BINARY); | |
72 | setmode (fd[1], O_BINARY); | |
73 | } | |
74 | return ret; | |
75 | } | |
76 | ||
e9a17296 | 77 | int check_nt_auth(int pwd_authenticated, struct passwd *pw) |
3c0ef626 | 78 | { |
79 | /* | |
80 | * The only authentication which is able to change the user | |
81 | * context on NT systems is the password authentication. So | |
82 | * we deny all requsts for changing the user context if another | |
83 | * authentication method is used. | |
84 | * | |
85 | * This doesn't apply to Cygwin versions >= 1.3.2 anymore which | |
86 | * uses the undocumented NtCreateToken() call to create a user | |
87 | * token if the process has the appropriate privileges and if | |
88 | * CYGWIN ntsec setting is on. | |
89 | */ | |
90 | static int has_create_token = -1; | |
91 | ||
e9a17296 | 92 | if (pw == NULL) |
93 | return 0; | |
3c0ef626 | 94 | if (is_winnt) { |
95 | if (has_create_token < 0) { | |
96 | struct utsname uts; | |
97 | int major_high = 0, major_low = 0, minor = 0; | |
98 | char *cygwin = getenv("CYGWIN"); | |
99 | ||
100 | has_create_token = 0; | |
101 | if (ntsec_on(cygwin) && !uname(&uts)) { | |
102 | sscanf(uts.release, "%d.%d.%d", | |
103 | &major_high, &major_low, &minor); | |
104 | if (major_high > 1 || | |
105 | (major_high == 1 && (major_low > 3 || | |
106 | (major_low == 3 && minor >= 2)))) | |
107 | has_create_token = 1; | |
108 | } | |
109 | } | |
110 | if (has_create_token < 1 && | |
e9a17296 | 111 | !pwd_authenticated && geteuid() != pw->pw_uid) |
3c0ef626 | 112 | return 0; |
113 | } | |
114 | return 1; | |
115 | } | |
116 | ||
117 | int check_ntsec(const char *filename) | |
118 | { | |
119 | char *cygwin; | |
120 | int allow_ntea = 0; | |
121 | int allow_ntsec = 0; | |
122 | struct statfs fsstat; | |
123 | ||
124 | /* Windows 95/98/ME don't support file system security at all. */ | |
125 | if (!is_winnt) | |
126 | return 0; | |
127 | ||
128 | /* Evaluate current CYGWIN settings. */ | |
129 | cygwin = getenv("CYGWIN"); | |
130 | allow_ntea = ntea_on(cygwin); | |
131 | allow_ntsec = ntsec_on(cygwin); | |
132 | ||
133 | /* | |
134 | * `ntea' is an emulation of POSIX attributes. It doesn't support | |
135 | * real file level security as ntsec on NTFS file systems does | |
136 | * but it supports FAT filesystems. `ntea' is minimum requirement | |
137 | * for security checks. | |
138 | */ | |
139 | if (allow_ntea) | |
140 | return 1; | |
141 | ||
142 | /* | |
143 | * Retrieve file system flags. In Cygwin, file system flags are | |
144 | * copied to f_type which has no meaning in Win32 itself. | |
145 | */ | |
146 | if (statfs(filename, &fsstat)) | |
147 | return 1; | |
148 | ||
149 | /* | |
150 | * Only file systems supporting ACLs are able to set permissions. | |
151 | * `ntsec' is the setting in Cygwin which switches using of NTFS | |
152 | * ACLs to support POSIX permissions on files. | |
153 | */ | |
154 | if (fsstat.f_type & FS_PERSISTENT_ACLS) | |
155 | return allow_ntsec; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
e9a17296 | 160 | void register_9x_service(void) |
161 | { | |
162 | HINSTANCE kerneldll; | |
163 | DWORD (*RegisterServiceProcess)(DWORD, DWORD); | |
164 | ||
165 | /* The service register mechanism in 9x/Me is pretty different from | |
166 | * NT/2K/XP. In NT/2K/XP we're using a special service starter | |
167 | * application to register and control sshd as service. This method | |
168 | * doesn't play nicely with 9x/Me. For that reason we register here | |
169 | * as service when running under 9x/Me. This function is only called | |
170 | * by the child sshd when it's going to daemonize. | |
171 | */ | |
172 | if (is_winnt) | |
173 | return; | |
174 | if (! (kerneldll = LoadLibrary("KERNEL32.DLL"))) | |
175 | return; | |
176 | if (! (RegisterServiceProcess = (DWORD (*)(DWORD, DWORD)) | |
177 | GetProcAddress(kerneldll, "RegisterServiceProcess"))) | |
178 | return; | |
179 | RegisterServiceProcess(0, 1); | |
180 | } | |
181 | ||
3c0ef626 | 182 | #endif /* HAVE_CYGWIN */ |