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 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 59 check_ntsec(const char *filename) 60 { 61 return (pathconf(filename, _PC_POSIX_PERMISSIONS)); 62 } 63 64 const char * 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 ** 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 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 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 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)) < 0) 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)) < 0) 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 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