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3c62e7eb | 1 | /* |
3c62e7eb | 2 | * cygwin_util.c |
3 | * | |
4e51cc76 | 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. | |
3c62e7eb | 14 | * |
4e51cc76 | 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. | |
3c62e7eb | 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 | ||
0b202697 | 32 | #include "includes.h" |
33 | ||
34 | RCSID("$Id$"); | |
3c62e7eb | 35 | |
36 | #ifdef HAVE_CYGWIN | |
2f125ca1 | 37 | |
3c62e7eb | 38 | #include <fcntl.h> |
9cd45ea4 | 39 | #include <stdlib.h> |
31fb6aaf | 40 | #include <sys/utsname.h> |
9cd45ea4 | 41 | #include <sys/vfs.h> |
42 | #include <windows.h> | |
43 | #define is_winnt (GetVersion() < 0x80000000) | |
3c62e7eb | 44 | |
31fb6aaf | 45 | #define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec")) |
f00addc9 | 46 | #define ntsec_off(c) ((c) && strstr((c),"nontsec")) |
31fb6aaf | 47 | #define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea")) |
48 | ||
58e7f038 | 49 | #if defined(open) && open == binary_open |
50 | # undef open | |
51 | #endif | |
52 | #if defined(pipe) && open == binary_pipe | |
53 | # undef pipe | |
54 | #endif | |
55 | ||
9901cb37 | 56 | int |
57 | binary_open(const char *filename, int flags, ...) | |
3c62e7eb | 58 | { |
58e7f038 | 59 | va_list ap; |
60 | mode_t mode; | |
61 | ||
62 | va_start(ap, flags); | |
63 | mode = va_arg(ap, mode_t); | |
64 | va_end(ap); | |
9901cb37 | 65 | return (open(filename, flags | O_BINARY, mode)); |
3c62e7eb | 66 | } |
67 | ||
9901cb37 | 68 | int |
69 | binary_pipe(int fd[2]) | |
3c62e7eb | 70 | { |
2f125ca1 | 71 | int ret = pipe(fd); |
72 | ||
73 | if (!ret) { | |
9901cb37 | 74 | setmode(fd[0], O_BINARY); |
75 | setmode(fd[1], O_BINARY); | |
2f125ca1 | 76 | } |
9901cb37 | 77 | return (ret); |
9cd45ea4 | 78 | } |
79 | ||
f00addc9 | 80 | #define HAS_CREATE_TOKEN 1 |
81 | #define HAS_NTSEC_BY_DEFAULT 2 | |
82 | ||
9901cb37 | 83 | static int |
84 | has_capability(int what) | |
f00addc9 | 85 | { |
f00addc9 | 86 | static int inited; |
87 | static int has_create_token; | |
88 | static int has_ntsec_by_default; | |
89 | ||
9901cb37 | 90 | /* |
91 | * has_capability() basically calls uname() and checks if | |
92 | * specific capabilities of Cygwin can be evaluated from that. | |
93 | * This simplifies the calling functions which only have to ask | |
94 | * for a capability using has_capability() instead of having | |
95 | * to figure that out by themselves. | |
96 | */ | |
f00addc9 | 97 | if (!inited) { |
98 | struct utsname uts; | |
99 | char *c; | |
100 | ||
101 | if (!uname(&uts)) { | |
9901cb37 | 102 | int major_high = 0, major_low = 0, minor = 0; |
103 | int api_major_version = 0, api_minor_version = 0; | |
f00addc9 | 104 | char *c; |
105 | ||
106 | sscanf(uts.release, "%d.%d.%d", &major_high, | |
9901cb37 | 107 | &major_low, &minor); |
108 | if ((c = strchr(uts.release, '(')) != NULL) { | |
f00addc9 | 109 | sscanf(c + 1, "%d.%d", &api_major_version, |
9901cb37 | 110 | &api_minor_version); |
111 | } | |
f00addc9 | 112 | if (major_high > 1 || |
113 | (major_high == 1 && (major_low > 3 || | |
9901cb37 | 114 | (major_low == 3 && minor >= 2)))) |
f00addc9 | 115 | has_create_token = 1; |
116 | if (api_major_version > 0 || api_minor_version >= 56) | |
117 | has_ntsec_by_default = 1; | |
118 | inited = 1; | |
119 | } | |
120 | } | |
121 | switch (what) { | |
122 | case HAS_CREATE_TOKEN: | |
9901cb37 | 123 | return (has_create_token); |
f00addc9 | 124 | case HAS_NTSEC_BY_DEFAULT: |
9901cb37 | 125 | return (has_ntsec_by_default); |
f00addc9 | 126 | } |
9901cb37 | 127 | return (0); |
f00addc9 | 128 | } |
129 | ||
9901cb37 | 130 | int |
131 | check_nt_auth(int pwd_authenticated, struct passwd *pw) | |
9cd45ea4 | 132 | { |
133 | /* | |
2f125ca1 | 134 | * The only authentication which is able to change the user |
135 | * context on NT systems is the password authentication. So | |
136 | * we deny all requsts for changing the user context if another | |
137 | * authentication method is used. | |
31fb6aaf | 138 | * |
139 | * This doesn't apply to Cygwin versions >= 1.3.2 anymore which | |
140 | * uses the undocumented NtCreateToken() call to create a user | |
141 | * token if the process has the appropriate privileges and if | |
142 | * CYGWIN ntsec setting is on. | |
2f125ca1 | 143 | */ |
31fb6aaf | 144 | static int has_create_token = -1; |
145 | ||
e9571a2c | 146 | if (pw == NULL) |
147 | return 0; | |
31fb6aaf | 148 | if (is_winnt) { |
149 | if (has_create_token < 0) { | |
31fb6aaf | 150 | char *cygwin = getenv("CYGWIN"); |
151 | ||
152 | has_create_token = 0; | |
f00addc9 | 153 | if (has_capability(HAS_CREATE_TOKEN) && |
154 | (ntsec_on(cygwin) || | |
9901cb37 | 155 | (has_capability(HAS_NTSEC_BY_DEFAULT) && |
156 | !ntsec_off(cygwin)))) | |
f00addc9 | 157 | has_create_token = 1; |
31fb6aaf | 158 | } |
159 | if (has_create_token < 1 && | |
e9571a2c | 160 | !pwd_authenticated && geteuid() != pw->pw_uid) |
9901cb37 | 161 | return (0); |
31fb6aaf | 162 | } |
9901cb37 | 163 | return (1); |
9cd45ea4 | 164 | } |
165 | ||
9901cb37 | 166 | int |
167 | check_ntsec(const char *filename) | |
9cd45ea4 | 168 | { |
169 | char *cygwin; | |
9901cb37 | 170 | int allow_ntea = 0, allow_ntsec = 0; |
9cd45ea4 | 171 | struct statfs fsstat; |
172 | ||
173 | /* Windows 95/98/ME don't support file system security at all. */ | |
174 | if (!is_winnt) | |
9901cb37 | 175 | return (0); |
9cd45ea4 | 176 | |
177 | /* Evaluate current CYGWIN settings. */ | |
31fb6aaf | 178 | cygwin = getenv("CYGWIN"); |
179 | allow_ntea = ntea_on(cygwin); | |
f00addc9 | 180 | allow_ntsec = ntsec_on(cygwin) || |
9901cb37 | 181 | (has_capability(HAS_NTSEC_BY_DEFAULT) && !ntsec_off(cygwin)); |
9cd45ea4 | 182 | |
183 | /* | |
184 | * `ntea' is an emulation of POSIX attributes. It doesn't support | |
185 | * real file level security as ntsec on NTFS file systems does | |
186 | * but it supports FAT filesystems. `ntea' is minimum requirement | |
187 | * for security checks. | |
188 | */ | |
189 | if (allow_ntea) | |
9901cb37 | 190 | return (1); |
9cd45ea4 | 191 | |
192 | /* | |
193 | * Retrieve file system flags. In Cygwin, file system flags are | |
194 | * copied to f_type which has no meaning in Win32 itself. | |
195 | */ | |
196 | if (statfs(filename, &fsstat)) | |
9901cb37 | 197 | return (1); |
9cd45ea4 | 198 | |
199 | /* | |
200 | * Only file systems supporting ACLs are able to set permissions. | |
201 | * `ntsec' is the setting in Cygwin which switches using of NTFS | |
202 | * ACLs to support POSIX permissions on files. | |
203 | */ | |
204 | if (fsstat.f_type & FS_PERSISTENT_ACLS) | |
9901cb37 | 205 | return (allow_ntsec); |
9cd45ea4 | 206 | |
9901cb37 | 207 | return (0); |
3c62e7eb | 208 | } |
2f125ca1 | 209 | |
9901cb37 | 210 | void |
211 | register_9x_service(void) | |
ffb8d130 | 212 | { |
213 | HINSTANCE kerneldll; | |
214 | DWORD (*RegisterServiceProcess)(DWORD, DWORD); | |
215 | ||
216 | /* The service register mechanism in 9x/Me is pretty different from | |
217 | * NT/2K/XP. In NT/2K/XP we're using a special service starter | |
218 | * application to register and control sshd as service. This method | |
219 | * doesn't play nicely with 9x/Me. For that reason we register here | |
220 | * as service when running under 9x/Me. This function is only called | |
221 | * by the child sshd when it's going to daemonize. | |
222 | */ | |
223 | if (is_winnt) | |
224 | return; | |
9901cb37 | 225 | if (!(kerneldll = LoadLibrary("KERNEL32.DLL"))) |
ffb8d130 | 226 | return; |
9901cb37 | 227 | if (!(RegisterServiceProcess = (DWORD (*)(DWORD, DWORD)) |
228 | GetProcAddress(kerneldll, "RegisterServiceProcess"))) | |
ffb8d130 | 229 | return; |
230 | RegisterServiceProcess(0, 1); | |
231 | } | |
232 | ||
2f125ca1 | 233 | #endif /* HAVE_CYGWIN */ |