1 /*
2 * Copyright (c) 2000, 2001, 2011, 2013 Corinna Vinschen <vinschen@redhat.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 #define NO_BINARY_OPEN /* Avoid redefining open to binary_open for this file */
31 #include "includes.h"
32
33 #ifdef HAVE_CYGWIN
34
35 #include <sys/types.h>
36 #include <fcntl.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include <stdarg.h>
40 #include <stdlib.h>
41 #include <wchar.h>
42 #include <wctype.h>
43
44 #include "xmalloc.h"
45
46 int
binary_open(const char * filename,int flags,...)47 binary_open(const char *filename, int flags, ...)
48 {
49 va_list ap;
50 mode_t mode;
51
52 va_start(ap, flags);
53 mode = va_arg(ap, mode_t);
54 va_end(ap);
55 return (open(filename, flags | O_BINARY, mode));
56 }
57
58 int
check_ntsec(const char * filename)59 check_ntsec(const char *filename)
60 {
61 return (pathconf(filename, _PC_POSIX_PERMISSIONS));
62 }
63
64 const char *
cygwin_ssh_privsep_user()65 cygwin_ssh_privsep_user()
66 {
67 static char cyg_privsep_user[DNLEN + UNLEN + 2];
68
69 if (!cyg_privsep_user[0])
70 {
71 #ifdef CW_CYGNAME_FROM_WINNAME
72 if (cygwin_internal (CW_CYGNAME_FROM_WINNAME, "sshd", cyg_privsep_user,
73 sizeof cyg_privsep_user) != 0)
74 #endif
75 strlcpy(cyg_privsep_user, "sshd", sizeof(cyg_privsep_user));
76 }
77 return cyg_privsep_user;
78 }
79
80 #define NL(x) x, (sizeof (x) - 1)
81 #define WENV_SIZ (sizeof (wenv_arr) / sizeof (wenv_arr[0]))
82
83 static struct wenv {
84 const char *name;
85 size_t namelen;
86 } wenv_arr[] = {
87 { NL("ALLUSERSPROFILE=") },
88 { NL("COMPUTERNAME=") },
89 { NL("COMSPEC=") },
90 { NL("CYGWIN=") },
91 { NL("OS=") },
92 { NL("PATH=") },
93 { NL("PATHEXT=") },
94 { NL("PROGRAMFILES=") },
95 { NL("SYSTEMDRIVE=") },
96 { NL("SYSTEMROOT=") },
97 { NL("WINDIR=") }
98 };
99
100 char **
fetch_windows_environment(void)101 fetch_windows_environment(void)
102 {
103 char **e, **p;
104 unsigned int i, idx = 0;
105
106 p = xcalloc(WENV_SIZ + 1, sizeof(char *));
107 for (e = environ; *e != NULL; ++e) {
108 for (i = 0; i < WENV_SIZ; ++i) {
109 if (!strncmp(*e, wenv_arr[i].name, wenv_arr[i].namelen))
110 p[idx++] = *e;
111 }
112 }
113 p[idx] = NULL;
114 return p;
115 }
116
117 void
free_windows_environment(char ** p)118 free_windows_environment(char **p)
119 {
120 free(p);
121 }
122
123 /*
124 * Returns true if the given string matches the pattern (which may contain ?
125 * and * as wildcards), and zero if it does not match.
126 *
127 * The Cygwin version of this function must be case-insensitive and take
128 * Unicode characters into account.
129 */
130
131 static int
__match_pattern(const wchar_t * s,const wchar_t * pattern)132 __match_pattern (const wchar_t *s, const wchar_t *pattern)
133 {
134 for (;;) {
135 /* If at end of pattern, accept if also at end of string. */
136 if (!*pattern)
137 return !*s;
138
139 if (*pattern == '*') {
140 /* Skip the asterisk. */
141 pattern++;
142
143 /* If at end of pattern, accept immediately. */
144 if (!*pattern)
145 return 1;
146
147 /* If next character in pattern is known, optimize. */
148 if (*pattern != '?' && *pattern != '*') {
149 /*
150 * Look instances of the next character in
151 * pattern, and try to match starting from
152 * those.
153 */
154 for (; *s; s++)
155 if (*s == *pattern &&
156 __match_pattern(s + 1, pattern + 1))
157 return 1;
158 /* Failed. */
159 return 0;
160 }
161 /*
162 * Move ahead one character at a time and try to
163 * match at each position.
164 */
165 for (; *s; s++)
166 if (__match_pattern(s, pattern))
167 return 1;
168 /* Failed. */
169 return 0;
170 }
171 /*
172 * There must be at least one more character in the string.
173 * If we are at the end, fail.
174 */
175 if (!*s)
176 return 0;
177
178 /* Check if the next character of the string is acceptable. */
179 if (*pattern != '?' && towlower(*pattern) != towlower(*s))
180 return 0;
181
182 /* Move to the next character, both in string and in pattern. */
183 s++;
184 pattern++;
185 }
186 /* NOTREACHED */
187 }
188
189 static int
_match_pattern(const char * s,const char * pattern)190 _match_pattern(const char *s, const char *pattern)
191 {
192 wchar_t *ws;
193 wchar_t *wpattern;
194 size_t len;
195 int ret;
196
197 if ((len = mbstowcs(NULL, s, 0)) == (size_t) -1)
198 return 0;
199 ws = (wchar_t *) xcalloc(len + 1, sizeof (wchar_t));
200 mbstowcs(ws, s, len + 1);
201 if ((len = mbstowcs(NULL, pattern, 0)) == (size_t) -1)
202 return 0;
203 wpattern = (wchar_t *) xcalloc(len + 1, sizeof (wchar_t));
204 mbstowcs(wpattern, pattern, len + 1);
205 ret = __match_pattern (ws, wpattern);
206 free(ws);
207 free(wpattern);
208 return ret;
209 }
210
211 /*
212 * Tries to match the string against the
213 * comma-separated sequence of subpatterns (each possibly preceded by ! to
214 * indicate negation). Returns -1 if negation matches, 1 if there is
215 * a positive match, 0 if there is no match at all.
216 */
217 int
cygwin_ug_match_pattern_list(const char * string,const char * pattern)218 cygwin_ug_match_pattern_list(const char *string, const char *pattern)
219 {
220 char sub[1024];
221 int negated;
222 int got_positive;
223 u_int i, subi, len = strlen(pattern);
224
225 got_positive = 0;
226 for (i = 0; i < len;) {
227 /* Check if the subpattern is negated. */
228 if (pattern[i] == '!') {
229 negated = 1;
230 i++;
231 } else
232 negated = 0;
233
234 /*
235 * Extract the subpattern up to a comma or end. Convert the
236 * subpattern to lowercase.
237 */
238 for (subi = 0;
239 i < len && subi < sizeof(sub) - 1 && pattern[i] != ',';
240 subi++, i++)
241 sub[subi] = pattern[i];
242 /* If subpattern too long, return failure (no match). */
243 if (subi >= sizeof(sub) - 1)
244 return 0;
245
246 /* If the subpattern was terminated by a comma, then skip it. */
247 if (i < len && pattern[i] == ',')
248 i++;
249
250 /* Null-terminate the subpattern. */
251 sub[subi] = '\0';
252
253 /* Try to match the subpattern against the string. */
254 if (_match_pattern(string, sub)) {
255 if (negated)
256 return -1; /* Negative */
257 else
258 got_positive = 1; /* Positive */
259 }
260 }
261
262 /*
263 * Return success if got a positive match. If there was a negative
264 * match, we have already returned -1 and never get here.
265 */
266 return got_positive;
267 }
268
269 #endif /* HAVE_CYGWIN */
270