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1 | /* | |
2 | * Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com> | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | * | |
24 | * Created: Sat Sep 02 12:17:00 2000 cv | |
25 | * | |
26 | * This file contains functions for forcing opened file descriptors to | |
27 | * binary mode on Windows systems. | |
28 | */ | |
29 | ||
30 | #include "includes.h" | |
31 | ||
32 | #ifdef HAVE_CYGWIN | |
33 | ||
34 | #if defined(open) && open == binary_open | |
35 | # undef open | |
36 | #endif | |
37 | #if defined(pipe) && open == binary_pipe | |
38 | # undef pipe | |
39 | #endif | |
40 | ||
41 | #include <sys/types.h> | |
42 | #include <sys/stat.h> | |
43 | #include <sys/utsname.h> | |
44 | #include <sys/vfs.h> | |
45 | ||
46 | #include <fcntl.h> | |
47 | #include <stdlib.h> | |
48 | #include <unistd.h> | |
49 | #include <windows.h> | |
50 | ||
51 | #include "xmalloc.h" | |
52 | #define is_winnt (GetVersion() < 0x80000000) | |
53 | ||
54 | #define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec")) | |
55 | #define ntsec_off(c) ((c) && strstr((c),"nontsec")) | |
56 | #define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea")) | |
57 | ||
58 | int | |
59 | binary_open(const char *filename, int flags, ...) | |
60 | { | |
61 | va_list ap; | |
62 | mode_t mode; | |
63 | ||
64 | va_start(ap, flags); | |
65 | mode = va_arg(ap, mode_t); | |
66 | va_end(ap); | |
67 | return (open(filename, flags | O_BINARY, mode)); | |
68 | } | |
69 | ||
70 | int | |
71 | binary_pipe(int fd[2]) | |
72 | { | |
73 | int ret = pipe(fd); | |
74 | ||
75 | if (!ret) { | |
76 | setmode(fd[0], O_BINARY); | |
77 | setmode(fd[1], O_BINARY); | |
78 | } | |
79 | return (ret); | |
80 | } | |
81 | ||
82 | #define HAS_CREATE_TOKEN 1 | |
83 | #define HAS_NTSEC_BY_DEFAULT 2 | |
84 | #define HAS_CREATE_TOKEN_WO_NTSEC 3 | |
85 | ||
86 | static int | |
87 | has_capability(int what) | |
88 | { | |
89 | static int inited; | |
90 | static int has_create_token; | |
91 | static int has_ntsec_by_default; | |
92 | static int has_create_token_wo_ntsec; | |
93 | ||
94 | /* | |
95 | * has_capability() basically calls uname() and checks if | |
96 | * specific capabilities of Cygwin can be evaluated from that. | |
97 | * This simplifies the calling functions which only have to ask | |
98 | * for a capability using has_capability() instead of having | |
99 | * to figure that out by themselves. | |
100 | */ | |
101 | if (!inited) { | |
102 | struct utsname uts; | |
103 | ||
104 | if (!uname(&uts)) { | |
105 | int major_high = 0, major_low = 0, minor = 0; | |
106 | int api_major_version = 0, api_minor_version = 0; | |
107 | char *c; | |
108 | ||
109 | sscanf(uts.release, "%d.%d.%d", &major_high, | |
110 | &major_low, &minor); | |
111 | if ((c = strchr(uts.release, '(')) != NULL) { | |
112 | sscanf(c + 1, "%d.%d", &api_major_version, | |
113 | &api_minor_version); | |
114 | } | |
115 | if (major_high > 1 || | |
116 | (major_high == 1 && (major_low > 3 || | |
117 | (major_low == 3 && minor >= 2)))) | |
118 | has_create_token = 1; | |
119 | if (api_major_version > 0 || api_minor_version >= 56) | |
120 | has_ntsec_by_default = 1; | |
121 | if (major_high > 1 || | |
122 | (major_high == 1 && major_low >= 5)) | |
123 | has_create_token_wo_ntsec = 1; | |
124 | inited = 1; | |
125 | } | |
126 | } | |
127 | switch (what) { | |
128 | case HAS_CREATE_TOKEN: | |
129 | return (has_create_token); | |
130 | case HAS_NTSEC_BY_DEFAULT: | |
131 | return (has_ntsec_by_default); | |
132 | case HAS_CREATE_TOKEN_WO_NTSEC: | |
133 | return (has_create_token_wo_ntsec); | |
134 | } | |
135 | return (0); | |
136 | } | |
137 | ||
138 | int | |
139 | check_nt_auth(int pwd_authenticated, struct passwd *pw) | |
140 | { | |
141 | /* | |
142 | * The only authentication which is able to change the user | |
143 | * context on NT systems is the password authentication. So | |
144 | * we deny all requsts for changing the user context if another | |
145 | * authentication method is used. | |
146 | * | |
147 | * This doesn't apply to Cygwin versions >= 1.3.2 anymore which | |
148 | * uses the undocumented NtCreateToken() call to create a user | |
149 | * token if the process has the appropriate privileges and if | |
150 | * CYGWIN ntsec setting is on. | |
151 | */ | |
152 | static int has_create_token = -1; | |
153 | ||
154 | if (pw == NULL) | |
155 | return 0; | |
156 | if (is_winnt) { | |
157 | if (has_create_token < 0) { | |
158 | char *cygwin = getenv("CYGWIN"); | |
159 | ||
160 | has_create_token = 0; | |
161 | if (has_capability(HAS_CREATE_TOKEN) && | |
162 | (ntsec_on(cygwin) || | |
163 | (has_capability(HAS_NTSEC_BY_DEFAULT) && | |
164 | !ntsec_off(cygwin)) || | |
165 | has_capability(HAS_CREATE_TOKEN_WO_NTSEC))) | |
166 | has_create_token = 1; | |
167 | } | |
168 | if (has_create_token < 1 && | |
169 | !pwd_authenticated && geteuid() != pw->pw_uid) | |
170 | return (0); | |
171 | } | |
172 | return (1); | |
173 | } | |
174 | ||
175 | int | |
176 | check_ntsec(const char *filename) | |
177 | { | |
178 | char *cygwin; | |
179 | int allow_ntea = 0, allow_ntsec = 0; | |
180 | struct statfs fsstat; | |
181 | ||
182 | /* Windows 95/98/ME don't support file system security at all. */ | |
183 | if (!is_winnt) | |
184 | return (0); | |
185 | ||
186 | /* Evaluate current CYGWIN settings. */ | |
187 | cygwin = getenv("CYGWIN"); | |
188 | allow_ntea = ntea_on(cygwin); | |
189 | allow_ntsec = ntsec_on(cygwin) || | |
190 | (has_capability(HAS_NTSEC_BY_DEFAULT) && !ntsec_off(cygwin)); | |
191 | ||
192 | /* | |
193 | * `ntea' is an emulation of POSIX attributes. It doesn't support | |
194 | * real file level security as ntsec on NTFS file systems does | |
195 | * but it supports FAT filesystems. `ntea' is minimum requirement | |
196 | * for security checks. | |
197 | */ | |
198 | if (allow_ntea) | |
199 | return (1); | |
200 | ||
201 | /* | |
202 | * Retrieve file system flags. In Cygwin, file system flags are | |
203 | * copied to f_type which has no meaning in Win32 itself. | |
204 | */ | |
205 | if (statfs(filename, &fsstat)) | |
206 | return (1); | |
207 | ||
208 | /* | |
209 | * Only file systems supporting ACLs are able to set permissions. | |
210 | * `ntsec' is the setting in Cygwin which switches using of NTFS | |
211 | * ACLs to support POSIX permissions on files. | |
212 | */ | |
213 | if (fsstat.f_type & FS_PERSISTENT_ACLS) | |
214 | return (allow_ntsec); | |
215 | ||
216 | return (0); | |
217 | } | |
218 | ||
219 | void | |
220 | register_9x_service(void) | |
221 | { | |
222 | HINSTANCE kerneldll; | |
223 | DWORD (*RegisterServiceProcess)(DWORD, DWORD); | |
224 | ||
225 | /* The service register mechanism in 9x/Me is pretty different from | |
226 | * NT/2K/XP. In NT/2K/XP we're using a special service starter | |
227 | * application to register and control sshd as service. This method | |
228 | * doesn't play nicely with 9x/Me. For that reason we register here | |
229 | * as service when running under 9x/Me. This function is only called | |
230 | * by the child sshd when it's going to daemonize. | |
231 | */ | |
232 | if (is_winnt) | |
233 | return; | |
234 | if (!(kerneldll = LoadLibrary("KERNEL32.DLL"))) | |
235 | return; | |
236 | if (!(RegisterServiceProcess = (DWORD (*)(DWORD, DWORD)) | |
237 | GetProcAddress(kerneldll, "RegisterServiceProcess"))) | |
238 | return; | |
239 | RegisterServiceProcess(0, 1); | |
240 | } | |
241 | ||
242 | #define NL(x) x, (sizeof (x) - 1) | |
243 | #define WENV_SIZ (sizeof (wenv_arr) / sizeof (wenv_arr[0])) | |
244 | ||
245 | static struct wenv { | |
246 | const char *name; | |
247 | size_t namelen; | |
248 | } wenv_arr[] = { | |
249 | { NL("ALLUSERSPROFILE=") }, | |
250 | { NL("COMMONPROGRAMFILES=") }, | |
251 | { NL("COMPUTERNAME=") }, | |
252 | { NL("COMSPEC=") }, | |
253 | { NL("CYGWIN=") }, | |
254 | { NL("NUMBER_OF_PROCESSORS=") }, | |
255 | { NL("OS=") }, | |
256 | { NL("PATH=") }, | |
257 | { NL("PATHEXT=") }, | |
258 | { NL("PROCESSOR_ARCHITECTURE=") }, | |
259 | { NL("PROCESSOR_IDENTIFIER=") }, | |
260 | { NL("PROCESSOR_LEVEL=") }, | |
261 | { NL("PROCESSOR_REVISION=") }, | |
262 | { NL("PROGRAMFILES=") }, | |
263 | { NL("SYSTEMDRIVE=") }, | |
264 | { NL("SYSTEMROOT=") }, | |
265 | { NL("TMP=") }, | |
266 | { NL("TEMP=") }, | |
267 | { NL("WINDIR=") } | |
268 | }; | |
269 | ||
270 | char ** | |
271 | fetch_windows_environment(void) | |
272 | { | |
273 | char **e, **p; | |
274 | unsigned int i, idx = 0; | |
275 | ||
276 | p = xcalloc(WENV_SIZ + 1, sizeof(char *)); | |
277 | for (e = environ; *e != NULL; ++e) { | |
278 | for (i = 0; i < WENV_SIZ; ++i) { | |
279 | if (!strncmp(*e, wenv_arr[i].name, wenv_arr[i].namelen)) | |
280 | p[idx++] = *e; | |
281 | } | |
282 | } | |
283 | p[idx] = NULL; | |
284 | return p; | |
285 | } | |
286 | ||
287 | void | |
288 | free_windows_environment(char **p) | |
289 | { | |
290 | xfree(p); | |
291 | } | |
292 | ||
293 | #endif /* HAVE_CYGWIN */ |