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/*
* Copyright (c) 2000, 2001, Corinna Vinschen <vinschen@cygnus.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Created: Sat Sep 02 12:17:00 2000 cv
*
* This file contains functions for forcing opened file descriptors to
* binary mode on Windows systems.
*/
#include "includes.h"
#ifdef HAVE_CYGWIN
#if defined(open) && open == binary_open
# undef open
#endif
#if defined(pipe) && open == binary_pipe
# undef pipe
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <sys/vfs.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <windows.h>
#include "xmalloc.h"
#define is_winnt (GetVersion() < 0x80000000)
#define ntsec_on(c) ((c) && strstr((c),"ntsec") && !strstr((c),"nontsec"))
#define ntsec_off(c) ((c) && strstr((c),"nontsec"))
#define ntea_on(c) ((c) && strstr((c),"ntea") && !strstr((c),"nontea"))
int
binary_open(const char *filename, int flags, ...)
{
va_list ap;
mode_t mode;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
return (open(filename, flags | O_BINARY, mode));
}
int
binary_pipe(int fd[2])
{
int ret = pipe(fd);
if (!ret) {
setmode(fd[0], O_BINARY);
setmode(fd[1], O_BINARY);
}
return (ret);
}
#define HAS_CREATE_TOKEN 1
#define HAS_NTSEC_BY_DEFAULT 2
#define HAS_CREATE_TOKEN_WO_NTSEC 3
static int
has_capability(int what)
{
static int inited;
static int has_create_token;
static int has_ntsec_by_default;
static int has_create_token_wo_ntsec;
/*
* has_capability() basically calls uname() and checks if
* specific capabilities of Cygwin can be evaluated from that.
* This simplifies the calling functions which only have to ask
* for a capability using has_capability() instead of having
* to figure that out by themselves.
*/
if (!inited) {
struct utsname uts;
if (!uname(&uts)) {
int major_high = 0, major_low = 0, minor = 0;
int api_major_version = 0, api_minor_version = 0;
char *c;
sscanf(uts.release, "%d.%d.%d", &major_high,
&major_low, &minor);
if ((c = strchr(uts.release, '(')) != NULL) {
sscanf(c + 1, "%d.%d", &api_major_version,
&api_minor_version);
}
if (major_high > 1 ||
(major_high == 1 && (major_low > 3 ||
(major_low == 3 && minor >= 2))))
has_create_token = 1;
if (api_major_version > 0 || api_minor_version >= 56)
has_ntsec_by_default = 1;
if (major_high > 1 ||
(major_high == 1 && major_low >= 5))
has_create_token_wo_ntsec = 1;
inited = 1;
}
}
switch (what) {
case HAS_CREATE_TOKEN:
return (has_create_token);
case HAS_NTSEC_BY_DEFAULT:
return (has_ntsec_by_default);
case HAS_CREATE_TOKEN_WO_NTSEC:
return (has_create_token_wo_ntsec);
}
return (0);
}
int
check_nt_auth(int pwd_authenticated, struct passwd *pw)
{
/*
* The only authentication which is able to change the user
* context on NT systems is the password authentication. So
* we deny all requsts for changing the user context if another
* authentication method is used.
*
* This doesn't apply to Cygwin versions >= 1.3.2 anymore which
* uses the undocumented NtCreateToken() call to create a user
* token if the process has the appropriate privileges and if
* CYGWIN ntsec setting is on.
*/
static int has_create_token = -1;
if (pw == NULL)
return 0;
if (is_winnt) {
if (has_create_token < 0) {
char *cygwin = getenv("CYGWIN");
has_create_token = 0;
if (has_capability(HAS_CREATE_TOKEN) &&
(ntsec_on(cygwin) ||
(has_capability(HAS_NTSEC_BY_DEFAULT) &&
!ntsec_off(cygwin)) ||
has_capability(HAS_CREATE_TOKEN_WO_NTSEC)))
has_create_token = 1;
}
if (has_create_token < 1 &&
!pwd_authenticated && geteuid() != pw->pw_uid)
return (0);
}
return (1);
}
int
check_ntsec(const char *filename)
{
return (pathconf(filename, _PC_POSIX_PERMISSIONS));
}
void
register_9x_service(void)
{
HINSTANCE kerneldll;
DWORD (*RegisterServiceProcess)(DWORD, DWORD);
/* The service register mechanism in 9x/Me is pretty different from
* NT/2K/XP. In NT/2K/XP we're using a special service starter
* application to register and control sshd as service. This method
* doesn't play nicely with 9x/Me. For that reason we register here
* as service when running under 9x/Me. This function is only called
* by the child sshd when it's going to daemonize.
*/
if (is_winnt)
return;
if (!(kerneldll = LoadLibrary("KERNEL32.DLL")))
return;
if (!(RegisterServiceProcess = (DWORD (*)(DWORD, DWORD))
GetProcAddress(kerneldll, "RegisterServiceProcess")))
return;
RegisterServiceProcess(0, 1);
}
#define NL(x) x, (sizeof (x) - 1)
#define WENV_SIZ (sizeof (wenv_arr) / sizeof (wenv_arr[0]))
static struct wenv {
const char *name;
size_t namelen;
} wenv_arr[] = {
{ NL("ALLUSERSPROFILE=") },
{ NL("COMMONPROGRAMFILES=") },
{ NL("COMPUTERNAME=") },
{ NL("COMSPEC=") },
{ NL("CYGWIN=") },
{ NL("NUMBER_OF_PROCESSORS=") },
{ NL("OS=") },
{ NL("PATH=") },
{ NL("PATHEXT=") },
{ NL("PROCESSOR_ARCHITECTURE=") },
{ NL("PROCESSOR_IDENTIFIER=") },
{ NL("PROCESSOR_LEVEL=") },
{ NL("PROCESSOR_REVISION=") },
{ NL("PROGRAMFILES=") },
{ NL("SYSTEMDRIVE=") },
{ NL("SYSTEMROOT=") },
{ NL("TMP=") },
{ NL("TEMP=") },
{ NL("WINDIR=") }
};
char **
fetch_windows_environment(void)
{
char **e, **p;
unsigned int i, idx = 0;
p = xcalloc(WENV_SIZ + 1, sizeof(char *));
for (e = environ; *e != NULL; ++e) {
for (i = 0; i < WENV_SIZ; ++i) {
if (!strncmp(*e, wenv_arr[i].name, wenv_arr[i].namelen))
p[idx++] = *e;
}
}
p[idx] = NULL;
return p;
}
void
free_windows_environment(char **p)
{
xfree(p);
}
#endif /* HAVE_CYGWIN */
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