1 files changed, 105 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-cygwin_util.c b/openbsd-compat/bsd-cygwin_util.c
new file mode 100644
index 000000000..b540ebe1a
--- /dev/null
+++ b/openbsd-compat/bsd-cygwin_util.c
@@ -0,0 +1,105 @@
+/*
+ *
+ * cygwin_util.c
+ *
+ * Author: Corinna Vinschen <vinschen@cygnus.com>
+ *
+ * Copyright (c) 2000 Corinna Vinschen <vinschen@cygnus.com>, Duisburg, Germany
+ *                    All rights reserved
+ *
+ * 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 "config.h"
+
+#ifdef HAVE_CYGWIN
+
+#include <fcntl.h>
+#include <io.h>
+#include <stdlib.h>
+#include <sys/vfs.h>
+#include <windows.h>
+#define is_winnt       (GetVersion() < 0x80000000)
+
+int binary_open(const char *filename, int flags, mode_t mode)
+{
+        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;
+}
+
+int check_nt_auth(int pwd_authenticated, uid_t uid)
+{
+        /*
+        * 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 may change in future when a special openssh
+        * subauthentication package is available.
+        */
+        if (is_winnt && !pwd_authenticated && geteuid() != uid)
+                return 0;
+        
+        return 1;
+}
+
+int check_ntsec(const char *filename)
+{
+        char *cygwin;
+        int allow_ntea = 0;
+        int allow_ntsec = 0;
+        struct statfs fsstat;
+
+        /* Windows 95/98/ME don't support file system security at all. */
+        if (!is_winnt)
+                return 0;
+
+        /* Evaluate current CYGWIN settings. */
+        if ((cygwin = getenv("CYGWIN")) != NULL) {
+                if (strstr(cygwin, "ntea") && !strstr(cygwin, "nontea"))
+                        allow_ntea = 1;
+                if (strstr(cygwin, "ntsec") && !strstr(cygwin, "nontsec"))
+                        allow_ntsec = 1;
+        }
+
+        /*
+         * `ntea' is an emulation of POSIX attributes. It doesn't support
+         * real file level security as ntsec on NTFS file systems does
+         * but it supports FAT filesystems. `ntea' is minimum requirement
+         * for security checks.
+         */
+        if (allow_ntea)
+                return 1;
+
+        /*
+         * Retrieve file system flags. In Cygwin, file system flags are
+         * copied to f_type which has no meaning in Win32 itself.
+         */
+        if (statfs(filename, &fsstat))
+                return 1;
+
+        /*
+         * Only file systems supporting ACLs are able to set permissions.
+         * `ntsec' is the setting in Cygwin which switches using of NTFS
+         * ACLs to support POSIX permissions on files.
+         */
+        if (fsstat.f_type & FS_PERSISTENT_ACLS)
+                return allow_ntsec;
+
+        return 0;
+}
+
+#endif /* HAVE_CYGWIN */