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3c0ef626 | 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 "includes.h" | |
17 | ||
18 | RCSID("$Id$"); | |
19 | ||
20 | #ifdef HAVE_CYGWIN | |
21 | ||
22 | #include <fcntl.h> | |
23 | #include <stdlib.h> | |
24 | #include <sys/utsname.h> | |
25 | #include <sys/vfs.h> | |
26 | #include <windows.h> | |
27 | #define is_winnt (GetVersion() < 0x80000000) | |
28 | ||
29 | #define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec")) | |
30 | #define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea")) | |
31 | ||
32 | #if defined(open) && open == binary_open | |
33 | # undef open | |
34 | #endif | |
35 | #if defined(pipe) && open == binary_pipe | |
36 | # undef pipe | |
37 | #endif | |
38 | ||
39 | int binary_open(const char *filename, int flags, ...) | |
40 | { | |
41 | va_list ap; | |
42 | mode_t mode; | |
43 | ||
44 | va_start(ap, flags); | |
45 | mode = va_arg(ap, mode_t); | |
46 | va_end(ap); | |
47 | return open(filename, flags | O_BINARY, mode); | |
48 | } | |
49 | ||
50 | int binary_pipe(int fd[2]) | |
51 | { | |
52 | int ret = pipe(fd); | |
53 | ||
54 | if (!ret) { | |
55 | setmode (fd[0], O_BINARY); | |
56 | setmode (fd[1], O_BINARY); | |
57 | } | |
58 | return ret; | |
59 | } | |
60 | ||
e9a17296 | 61 | int check_nt_auth(int pwd_authenticated, struct passwd *pw) |
3c0ef626 | 62 | { |
63 | /* | |
64 | * The only authentication which is able to change the user | |
65 | * context on NT systems is the password authentication. So | |
66 | * we deny all requsts for changing the user context if another | |
67 | * authentication method is used. | |
68 | * | |
69 | * This doesn't apply to Cygwin versions >= 1.3.2 anymore which | |
70 | * uses the undocumented NtCreateToken() call to create a user | |
71 | * token if the process has the appropriate privileges and if | |
72 | * CYGWIN ntsec setting is on. | |
73 | */ | |
74 | static int has_create_token = -1; | |
75 | ||
e9a17296 | 76 | if (pw == NULL) |
77 | return 0; | |
3c0ef626 | 78 | if (is_winnt) { |
79 | if (has_create_token < 0) { | |
80 | struct utsname uts; | |
81 | int major_high = 0, major_low = 0, minor = 0; | |
82 | char *cygwin = getenv("CYGWIN"); | |
83 | ||
84 | has_create_token = 0; | |
85 | if (ntsec_on(cygwin) && !uname(&uts)) { | |
86 | sscanf(uts.release, "%d.%d.%d", | |
87 | &major_high, &major_low, &minor); | |
88 | if (major_high > 1 || | |
89 | (major_high == 1 && (major_low > 3 || | |
90 | (major_low == 3 && minor >= 2)))) | |
91 | has_create_token = 1; | |
92 | } | |
93 | } | |
94 | if (has_create_token < 1 && | |
e9a17296 | 95 | !pwd_authenticated && geteuid() != pw->pw_uid) |
3c0ef626 | 96 | return 0; |
97 | } | |
98 | return 1; | |
99 | } | |
100 | ||
101 | int check_ntsec(const char *filename) | |
102 | { | |
103 | char *cygwin; | |
104 | int allow_ntea = 0; | |
105 | int allow_ntsec = 0; | |
106 | struct statfs fsstat; | |
107 | ||
108 | /* Windows 95/98/ME don't support file system security at all. */ | |
109 | if (!is_winnt) | |
110 | return 0; | |
111 | ||
112 | /* Evaluate current CYGWIN settings. */ | |
113 | cygwin = getenv("CYGWIN"); | |
114 | allow_ntea = ntea_on(cygwin); | |
115 | allow_ntsec = ntsec_on(cygwin); | |
116 | ||
117 | /* | |
118 | * `ntea' is an emulation of POSIX attributes. It doesn't support | |
119 | * real file level security as ntsec on NTFS file systems does | |
120 | * but it supports FAT filesystems. `ntea' is minimum requirement | |
121 | * for security checks. | |
122 | */ | |
123 | if (allow_ntea) | |
124 | return 1; | |
125 | ||
126 | /* | |
127 | * Retrieve file system flags. In Cygwin, file system flags are | |
128 | * copied to f_type which has no meaning in Win32 itself. | |
129 | */ | |
130 | if (statfs(filename, &fsstat)) | |
131 | return 1; | |
132 | ||
133 | /* | |
134 | * Only file systems supporting ACLs are able to set permissions. | |
135 | * `ntsec' is the setting in Cygwin which switches using of NTFS | |
136 | * ACLs to support POSIX permissions on files. | |
137 | */ | |
138 | if (fsstat.f_type & FS_PERSISTENT_ACLS) | |
139 | return allow_ntsec; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
e9a17296 | 144 | void register_9x_service(void) |
145 | { | |
146 | HINSTANCE kerneldll; | |
147 | DWORD (*RegisterServiceProcess)(DWORD, DWORD); | |
148 | ||
149 | /* The service register mechanism in 9x/Me is pretty different from | |
150 | * NT/2K/XP. In NT/2K/XP we're using a special service starter | |
151 | * application to register and control sshd as service. This method | |
152 | * doesn't play nicely with 9x/Me. For that reason we register here | |
153 | * as service when running under 9x/Me. This function is only called | |
154 | * by the child sshd when it's going to daemonize. | |
155 | */ | |
156 | if (is_winnt) | |
157 | return; | |
158 | if (! (kerneldll = LoadLibrary("KERNEL32.DLL"))) | |
159 | return; | |
160 | if (! (RegisterServiceProcess = (DWORD (*)(DWORD, DWORD)) | |
161 | GetProcAddress(kerneldll, "RegisterServiceProcess"))) | |
162 | return; | |
163 | RegisterServiceProcess(0, 1); | |
164 | } | |
165 | ||
3c0ef626 | 166 | #endif /* HAVE_CYGWIN */ |