2 * Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
24 * Created: Sat Sep 02 12:17:00 2000 cv
26 * This file contains functions for forcing opened file descriptors to
27 * binary mode on Windows systems.
38 #include <sys/utsname.h>
41 #define is_winnt (GetVersion() < 0x80000000)
43 #define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec"))
44 #define ntsec_off(c) ((c) && strstr((c),"nontsec"))
45 #define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea"))
47 #if defined(open) && open == binary_open
50 #if defined(pipe) && open == binary_pipe
55 binary_open(const char *filename, int flags, ...)
61 mode = va_arg(ap, mode_t);
63 return (open(filename, flags | O_BINARY, mode));
67 binary_pipe(int fd[2])
72 setmode(fd[0], O_BINARY);
73 setmode(fd[1], O_BINARY);
78 #define HAS_CREATE_TOKEN 1
79 #define HAS_NTSEC_BY_DEFAULT 2
82 has_capability(int what)
85 static int has_create_token;
86 static int has_ntsec_by_default;
89 * has_capability() basically calls uname() and checks if
90 * specific capabilities of Cygwin can be evaluated from that.
91 * This simplifies the calling functions which only have to ask
92 * for a capability using has_capability() instead of having
93 * to figure that out by themselves.
100 int major_high = 0, major_low = 0, minor = 0;
101 int api_major_version = 0, api_minor_version = 0;
104 sscanf(uts.release, "%d.%d.%d", &major_high,
106 if ((c = strchr(uts.release, '(')) != NULL) {
107 sscanf(c + 1, "%d.%d", &api_major_version,
110 if (major_high > 1 ||
111 (major_high == 1 && (major_low > 3 ||
112 (major_low == 3 && minor >= 2))))
113 has_create_token = 1;
114 if (api_major_version > 0 || api_minor_version >= 56)
115 has_ntsec_by_default = 1;
120 case HAS_CREATE_TOKEN:
121 return (has_create_token);
122 case HAS_NTSEC_BY_DEFAULT:
123 return (has_ntsec_by_default);
129 check_nt_auth(int pwd_authenticated, struct passwd *pw)
132 * The only authentication which is able to change the user
133 * context on NT systems is the password authentication. So
134 * we deny all requsts for changing the user context if another
135 * authentication method is used.
137 * This doesn't apply to Cygwin versions >= 1.3.2 anymore which
138 * uses the undocumented NtCreateToken() call to create a user
139 * token if the process has the appropriate privileges and if
140 * CYGWIN ntsec setting is on.
142 static int has_create_token = -1;
147 if (has_create_token < 0) {
148 char *cygwin = getenv("CYGWIN");
150 has_create_token = 0;
151 if (has_capability(HAS_CREATE_TOKEN) &&
153 (has_capability(HAS_NTSEC_BY_DEFAULT) &&
154 !ntsec_off(cygwin))))
155 has_create_token = 1;
157 if (has_create_token < 1 &&
158 !pwd_authenticated && geteuid() != pw->pw_uid)
165 check_ntsec(const char *filename)
168 int allow_ntea = 0, allow_ntsec = 0;
169 struct statfs fsstat;
171 /* Windows 95/98/ME don't support file system security at all. */
175 /* Evaluate current CYGWIN settings. */
176 cygwin = getenv("CYGWIN");
177 allow_ntea = ntea_on(cygwin);
178 allow_ntsec = ntsec_on(cygwin) ||
179 (has_capability(HAS_NTSEC_BY_DEFAULT) && !ntsec_off(cygwin));
182 * `ntea' is an emulation of POSIX attributes. It doesn't support
183 * real file level security as ntsec on NTFS file systems does
184 * but it supports FAT filesystems. `ntea' is minimum requirement
185 * for security checks.
191 * Retrieve file system flags. In Cygwin, file system flags are
192 * copied to f_type which has no meaning in Win32 itself.
194 if (statfs(filename, &fsstat))
198 * Only file systems supporting ACLs are able to set permissions.
199 * `ntsec' is the setting in Cygwin which switches using of NTFS
200 * ACLs to support POSIX permissions on files.
202 if (fsstat.f_type & FS_PERSISTENT_ACLS)
203 return (allow_ntsec);
209 register_9x_service(void)
212 DWORD (*RegisterServiceProcess)(DWORD, DWORD);
214 /* The service register mechanism in 9x/Me is pretty different from
215 * NT/2K/XP. In NT/2K/XP we're using a special service starter
216 * application to register and control sshd as service. This method
217 * doesn't play nicely with 9x/Me. For that reason we register here
218 * as service when running under 9x/Me. This function is only called
219 * by the child sshd when it's going to daemonize.
223 if (!(kerneldll = LoadLibrary("KERNEL32.DLL")))
225 if (!(RegisterServiceProcess = (DWORD (*)(DWORD, DWORD))
226 GetProcAddress(kerneldll, "RegisterServiceProcess")))
228 RegisterServiceProcess(0, 1);
231 #endif /* HAVE_CYGWIN */