mirror of git://anongit.mindrot.org/openssh.git
234 lines
6.5 KiB
C
234 lines
6.5 KiB
C
/*
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* cygwin_util.c
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*
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* Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Created: Sat Sep 02 12:17:00 2000 cv
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*
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* This file contains functions for forcing opened file descriptors to
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* binary mode on Windows systems.
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*/
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#include "includes.h"
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RCSID("$Id: bsd-cygwin_util.c,v 1.10 2003/05/18 14:13:39 djm Exp $");
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#ifdef HAVE_CYGWIN
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/utsname.h>
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#include <sys/vfs.h>
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#include <windows.h>
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#define is_winnt (GetVersion() < 0x80000000)
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#define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec"))
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#define ntsec_off(c) ((c) && strstr((c),"nontsec"))
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#define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea"))
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#if defined(open) && open == binary_open
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# undef open
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#endif
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#if defined(pipe) && open == binary_pipe
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# undef pipe
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#endif
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int
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binary_open(const char *filename, int flags, ...)
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{
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va_list ap;
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mode_t mode;
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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return (open(filename, flags | O_BINARY, mode));
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}
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int
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binary_pipe(int fd[2])
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{
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int ret = pipe(fd);
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if (!ret) {
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setmode(fd[0], O_BINARY);
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setmode(fd[1], O_BINARY);
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}
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return (ret);
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}
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#define HAS_CREATE_TOKEN 1
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#define HAS_NTSEC_BY_DEFAULT 2
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static int
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has_capability(int what)
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{
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static int inited;
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static int has_create_token;
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static int has_ntsec_by_default;
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/*
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* has_capability() basically calls uname() and checks if
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* specific capabilities of Cygwin can be evaluated from that.
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* This simplifies the calling functions which only have to ask
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* for a capability using has_capability() instead of having
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* to figure that out by themselves.
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*/
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if (!inited) {
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struct utsname uts;
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char *c;
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if (!uname(&uts)) {
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int major_high = 0, major_low = 0, minor = 0;
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int api_major_version = 0, api_minor_version = 0;
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char *c;
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sscanf(uts.release, "%d.%d.%d", &major_high,
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&major_low, &minor);
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if ((c = strchr(uts.release, '(')) != NULL) {
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sscanf(c + 1, "%d.%d", &api_major_version,
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&api_minor_version);
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}
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if (major_high > 1 ||
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(major_high == 1 && (major_low > 3 ||
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(major_low == 3 && minor >= 2))))
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has_create_token = 1;
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if (api_major_version > 0 || api_minor_version >= 56)
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has_ntsec_by_default = 1;
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inited = 1;
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}
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}
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switch (what) {
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case HAS_CREATE_TOKEN:
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return (has_create_token);
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case HAS_NTSEC_BY_DEFAULT:
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return (has_ntsec_by_default);
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}
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return (0);
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}
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int
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check_nt_auth(int pwd_authenticated, struct passwd *pw)
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{
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/*
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* The only authentication which is able to change the user
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* context on NT systems is the password authentication. So
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* we deny all requsts for changing the user context if another
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* authentication method is used.
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*
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* This doesn't apply to Cygwin versions >= 1.3.2 anymore which
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* uses the undocumented NtCreateToken() call to create a user
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* token if the process has the appropriate privileges and if
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* CYGWIN ntsec setting is on.
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*/
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static int has_create_token = -1;
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if (pw == NULL)
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return 0;
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if (is_winnt) {
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if (has_create_token < 0) {
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char *cygwin = getenv("CYGWIN");
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has_create_token = 0;
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if (has_capability(HAS_CREATE_TOKEN) &&
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(ntsec_on(cygwin) ||
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(has_capability(HAS_NTSEC_BY_DEFAULT) &&
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!ntsec_off(cygwin))))
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has_create_token = 1;
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}
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if (has_create_token < 1 &&
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!pwd_authenticated && geteuid() != pw->pw_uid)
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return (0);
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}
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return (1);
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}
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int
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check_ntsec(const char *filename)
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{
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char *cygwin;
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int allow_ntea = 0, allow_ntsec = 0;
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struct statfs fsstat;
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/* Windows 95/98/ME don't support file system security at all. */
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if (!is_winnt)
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return (0);
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/* Evaluate current CYGWIN settings. */
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cygwin = getenv("CYGWIN");
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allow_ntea = ntea_on(cygwin);
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allow_ntsec = ntsec_on(cygwin) ||
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(has_capability(HAS_NTSEC_BY_DEFAULT) && !ntsec_off(cygwin));
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/*
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* `ntea' is an emulation of POSIX attributes. It doesn't support
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* real file level security as ntsec on NTFS file systems does
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* but it supports FAT filesystems. `ntea' is minimum requirement
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* for security checks.
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*/
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if (allow_ntea)
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return (1);
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/*
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* Retrieve file system flags. In Cygwin, file system flags are
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* copied to f_type which has no meaning in Win32 itself.
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*/
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if (statfs(filename, &fsstat))
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return (1);
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/*
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* Only file systems supporting ACLs are able to set permissions.
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* `ntsec' is the setting in Cygwin which switches using of NTFS
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* ACLs to support POSIX permissions on files.
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*/
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if (fsstat.f_type & FS_PERSISTENT_ACLS)
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return (allow_ntsec);
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return (0);
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}
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void
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register_9x_service(void)
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{
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HINSTANCE kerneldll;
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DWORD (*RegisterServiceProcess)(DWORD, DWORD);
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/* The service register mechanism in 9x/Me is pretty different from
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* NT/2K/XP. In NT/2K/XP we're using a special service starter
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* application to register and control sshd as service. This method
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* doesn't play nicely with 9x/Me. For that reason we register here
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* as service when running under 9x/Me. This function is only called
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* by the child sshd when it's going to daemonize.
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*/
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if (is_winnt)
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return;
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if (!(kerneldll = LoadLibrary("KERNEL32.DLL")))
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return;
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if (!(RegisterServiceProcess = (DWORD (*)(DWORD, DWORD))
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GetProcAddress(kerneldll, "RegisterServiceProcess")))
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return;
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RegisterServiceProcess(0, 1);
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}
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#endif /* HAVE_CYGWIN */
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