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-rw-r--r--mysys/my_access.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/mysys/my_access.c b/mysys/my_access.c
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+/* Copyright (c) 2000, 2012, Oracle and/or its affiliates
+ Copyright (c) 2012, 2014, SkySQL Ab
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
+
+#include "mysys_priv.h"
+#include <m_string.h>
+
+#ifdef __WIN__
+
+/*
+ Check a file or path for accessability.
+
+ SYNOPSIS
+ file_access()
+ path Path to file
+ amode Access method
+
+ RETURN VALUES
+ 0 ok
+ -1 error (We use -1 as my_access is mapped to access on other platforms)
+*/
+
+int my_access(const char *path, int amode)
+{
+ DWORD attributes;
+
+ attributes = GetFileAttributes(path);
+ if (attributes == INVALID_FILE_ATTRIBUTES ||
+ ((attributes & FILE_ATTRIBUTE_READONLY) && (amode & W_OK)))
+ {
+ my_errno= errno= EACCES;
+ return -1;
+ }
+ return 0;
+}
+
+#endif /* __WIN__ */
+
+
+/*
+ List of file names that causes problem on windows
+
+ NOTE that one can also not have file names of type CON.TXT
+
+ NOTE: it is important to keep "CLOCK$" on the first place,
+ we skip it in check_if_legal_tablename.
+*/
+static const char *reserved_names[]=
+{
+ "CLOCK$",
+ "CON", "PRN", "AUX", "NUL",
+ "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
+ "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+ NullS
+};
+
+#define MAX_RESERVED_NAME_LENGTH 6
+
+
+/*
+ Looks up a null-terminated string in a list,
+ case insensitively.
+
+ SYNOPSIS
+ str_list_find()
+ list list of items
+ str item to find
+
+ RETURN
+ 0 ok
+ 1 reserved file name
+*/
+static int str_list_find(const char **list, const char *str)
+{
+ const char **name;
+ for (name= list; *name; name++)
+ {
+ if (!my_strcasecmp(&my_charset_latin1, *name, str))
+ return 1;
+ }
+ return 0;
+}
+
+
+/*
+ A map for faster reserved_names lookup,
+ helps to avoid loops in many cases.
+ 1 - can be the first letter
+ 2 - can be the second letter
+ 4 - can be the third letter
+*/
+static char reserved_map[256]=
+{
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* !"#$%&'()*+,-./ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0123456789:;<=>? */
+ 0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* @ABCDEFGHIJKLMNO */
+ 3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* PQRSTUVWXYZ[\]^_ */
+ 0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* bcdefghijklmno */
+ 3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* pqrstuvwxyz{|}~. */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* ................ */
+};
+
+
+/*
+ Check if a table name may cause problems
+
+ SYNOPSIS
+ check_if_legal_tablename
+ name Table name (without any extensions)
+
+ DESCRIPTION
+ We don't check 'CLOCK$' because dollar sign is encoded as @0024,
+ making table file name 'CLOCK@0024', which is safe.
+ This is why we start lookup from the second element
+ (i.e. &reserver_name[1])
+
+ RETURN
+ 0 ok
+ 1 reserved file name
+*/
+
+int check_if_legal_tablename(const char *name)
+{
+ DBUG_ENTER("check_if_legal_tablename");
+ DBUG_RETURN((reserved_map[(uchar) name[0]] & 1) &&
+ (reserved_map[(uchar) name[1]] & 2) &&
+ (reserved_map[(uchar) name[2]] & 4) &&
+ str_list_find(&reserved_names[1], name));
+}
+
+
+#ifdef __WIN__
+/**
+ Checks if the drive letter supplied is valid or not. Valid drive
+ letters are A to Z, both lower case and upper case.
+
+ @param drive_letter : The drive letter to validate.
+
+ @return TRUE if the drive exists, FALSE otherwise.
+*/
+static my_bool does_drive_exists(char drive_letter)
+{
+ DWORD drive_mask= GetLogicalDrives();
+ drive_letter= toupper(drive_letter);
+
+ return (drive_letter >= 'A' && drive_letter <= 'Z') &&
+ (drive_mask & (0x1 << (drive_letter - 'A')));
+}
+
+/**
+ Verifies if the file name supplied is allowed or not. On Windows
+ file names with a colon (:) are not allowed because such file names
+ store data in Alternate Data Streams which can be used to hide
+ the data.
+ Apart from colon, other characters that are not allowed in filenames
+ on Windows are greater/less sign, double quotes, forward slash, backslash,
+ pipe and star characters.
+
+ See MSDN documentation on filename restrictions.
+
+ @param name contains the file name with or without path
+ @param length contains the length of file name
+ @param allow_current_dir TRUE if paths like C:foobar are allowed,
+ FALSE otherwise
+
+ @return TRUE if the file name is allowed, FALSE otherwise.
+*/
+#define ILLEGAL_FILENAME_CHARS "<>:\"/\\|?*"
+
+my_bool is_filename_allowed(const char *name __attribute__((unused)),
+ size_t length __attribute__((unused)),
+ my_bool allow_current_dir __attribute__((unused)))
+{
+ /*
+ For Windows, check if the file name contains : character.
+ Start from end of path and search if the file name contains :
+ */
+ const char* ch = NULL;
+ for (ch= name + length - 1; ch >= name; --ch)
+ {
+ if (FN_LIBCHAR == *ch || '/' == *ch)
+ break;
+ else if (':' == *ch)
+ {
+ /*
+ File names like C:foobar.txt are allowed since the syntax means
+ file foobar.txt in current directory of C drive. However file
+ names likes CC:foobar are not allowed since this syntax means ADS
+ foobar in file CC.
+ */
+ return (allow_current_dir && (ch - name == 1) &&
+ does_drive_exists(*name));
+ }
+ else if (strchr(ILLEGAL_FILENAME_CHARS, *ch))
+ return FALSE;
+ }
+ return TRUE;
+} /* is_filename_allowed */
+#endif /* __WIN__ */
+
+#if defined(__WIN__) || defined(__EMX__)
+
+
+/*
+ Check if a path will access a reserved file name that may cause problems
+
+ SYNOPSIS
+ check_if_legal_filename
+ path Path to file
+
+ RETURN
+ 0 ok
+ 1 reserved file name
+*/
+
+int check_if_legal_filename(const char *path)
+{
+ const char *end;
+ const char **reserved_name;
+ DBUG_ENTER("check_if_legal_filename");
+
+ if (!is_filename_allowed(path, strlen(path), TRUE))
+ DBUG_RETURN(1);
+
+ path+= dirname_length(path); /* To start of filename */
+ if (!(end= strchr(path, FN_EXTCHAR)))
+ end= strend(path);
+ if (path == end || (uint) (end - path) > MAX_RESERVED_NAME_LENGTH)
+ DBUG_RETURN(0); /* Simplify inner loop */
+
+ for (reserved_name= reserved_names; *reserved_name; reserved_name++)
+ {
+ const char *reserved= *reserved_name; /* never empty */
+ const char *name= path;
+
+ do
+ {
+ if (*reserved != my_toupper(&my_charset_latin1, *name))
+ break;
+ if (++name == end && !reserved[1])
+ DBUG_RETURN(1); /* Found wrong path */
+ } while (*++reserved);
+ }
+ DBUG_RETURN(0);
+}
+
+#endif /* defined(__WIN__) || defined(__EMX__) */