Bug #11764517: 57359: POSSIBLE TO CIRCUMVENT SECURE_FILE_PRIV

  USING '..' ON WINDOWS

Backport of the fix to 5.0 (to be null-merged to 5.1).
Moved the test into the main test suite. 
Made mysql-test-run.pl to not use symlinks for sdtdata as the symlinks
are now properly recognized by secure_file_priv.
Made sure the paths in load_file(), LOAD DATA and SELECT .. INTO OUTFILE 
that are checked against secure_file_priv in a correct way similarly to 5.1 
by the extended is_secure_file_path() backport before the comparison.
Added an extensive test with all the variants of upper/lower case, 
slash/backslash and case sensitivity.
Added few comments to the code.

mysql-test/mysql-test-run.pl

@@ -2412,17 +2412,9 @@ sub setup_vardir() {
     mkpath("$data_dir/test");
   }
 
-  # Make a link std_data_ln in var/ that points to std_data
-  if ( ! $glob_win32 )
-  {
-    symlink("$glob_mysql_test_dir/std_data", "$opt_vardir/std_data_ln");
-  }
-  else
-  {
-    # on windows, copy all files from std_data into var/std_data_ln
+  # copy all files from std_data into var/std_data_ln
   mkpath("$opt_vardir/std_data_ln");
   mtr_copy_dir("$glob_mysql_test_dir/std_data", "$opt_vardir/std_data_ln");
-  }
 
   # Remove old log files
   foreach my $name (glob("r/*.progress r/*.log r/*.warnings"))

mysql-test/r/secure_file_priv_win.result

+CREATE TABLE t1 (c1 longtext);
+INSERT INTO t1 values ('a');
+SELECT * FROM t1 INTO OUTFILE 'd:/mysql/work/test-5.0-security/mysql-test/var/tmp/B11764517.tmp';
+show global variables like 'secure_file_priv';
+Variable_name	Value
+secure_file_priv	MYSQL_TMP_DIR/
+SELECT load_file('MYSQL_TMP_DIR\\B11764517.tmp') AS x;
+x
+a
+
+SELECT load_file('MYSQL_TMP_DIR/B11764517.tmp') AS x;
+x
+a
+
+SELECT load_file('MYSQL_TMP_DIR_UCASE/B11764517.tmp') AS x;
+x
+a
+
+SELECT load_file('MYSQL_TMP_DIR_LCASE/B11764517.tmp') AS x;
+x
+a
+
+SELECT load_file('MYSQL_TMP_DIR\\..a..\\..\\..\\B11764517.tmp') AS x;
+x
+NULL
+LOAD DATA INFILE 'MYSQL_TMP_DIR\\B11764517.tmp' INTO TABLE t1;
+LOAD DATA INFILE 'MYSQL_TMP_DIR/B11764517.tmp' INTO TABLE t1;
+LOAD DATA INFILE 'MYSQL_TMP_DIR_UCASE/B11764517.tmp' INTO TABLE t1;
+LOAD DATA INFILE 'MYSQL_TMP_DIR_LCASE/B11764517.tmp' INTO TABLE t1;
+LOAD DATA INFILE "MYSQL_TMP_DIR\\..a..\\..\\..\\B11764517.tmp" into table t1;
+ERROR HY000: The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
+SELECT * FROM t1 INTO OUTFILE 'MYSQL_TMP_DIR\\..a..\\..\\..\\B11764517-2.tmp';
+ERROR HY000: The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
+SELECT * FROM t1 INTO OUTFILE 'MYSQL_TMP_DIR\\B11764517-2.tmp';
+SELECT * FROM t1 INTO OUTFILE 'MYSQL_TMP_DIR/B11764517-3.tmp';
+SELECT * FROM t1 INTO OUTFILE 'MYSQL_TMP_DIR_UCASE/B11764517-4.tmp';
+SELECT * FROM t1 INTO OUTFILE 'MYSQL_TMP_DIR_LCASE/B11764517-5.tmp';
+DROP TABLE t1;

mysql-test/t/secure_file_priv_win-master.opt

+--secure_file_priv=$MYSQL_TMP_DIR

mysql-test/t/secure_file_priv_win.test

+#
+# Bug58747 breaks secure_file_priv+not secure yet+still accesses other folders
+#
+
+# we do the windows specific relative directory testing
+
+--source include/windows.inc
+
+CREATE TABLE t1 (c1 longtext);
+INSERT INTO t1 values ('a');
+
+LET $MYSQL_TMP_DIR_UCASE= `SELECT upper('$MYSQL_TMP_DIR')`;
+LET $MYSQL_TMP_DIR_LCASE= `SELECT lower('$MYSQL_TMP_DIR')`;
+
+#create the file
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR_LCASE/B11764517.tmp';
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+show global variables like 'secure_file_priv';
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT load_file('$MYSQL_TMP_DIR\\\\B11764517.tmp') AS x;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT load_file('$MYSQL_TMP_DIR/B11764517.tmp') AS x;
+
+--replace_result $MYSQL_TMP_DIR_UCASE MYSQL_TMP_DIR_UCASE
+eval SELECT load_file('$MYSQL_TMP_DIR_UCASE/B11764517.tmp') AS x;
+
+--replace_result $MYSQL_TMP_DIR_LCASE MYSQL_TMP_DIR_LCASE
+eval SELECT load_file('$MYSQL_TMP_DIR_LCASE/B11764517.tmp') AS x;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT load_file('$MYSQL_TMP_DIR\\\\..a..\\\\..\\\\..\\\\B11764517.tmp') AS x;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval LOAD DATA INFILE '$MYSQL_TMP_DIR\\\\B11764517.tmp' INTO TABLE t1;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval LOAD DATA INFILE '$MYSQL_TMP_DIR/B11764517.tmp' INTO TABLE t1;
+
+--replace_result $MYSQL_TMP_DIR_UCASE MYSQL_TMP_DIR_UCASE
+eval LOAD DATA INFILE '$MYSQL_TMP_DIR_UCASE/B11764517.tmp' INTO TABLE t1;
+
+--replace_result $MYSQL_TMP_DIR_LCASE MYSQL_TMP_DIR_LCASE
+eval LOAD DATA INFILE '$MYSQL_TMP_DIR_LCASE/B11764517.tmp' INTO TABLE t1;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+--error ER_OPTION_PREVENTS_STATEMENT
+eval LOAD DATA INFILE "$MYSQL_TMP_DIR\\\\..a..\\\\..\\\\..\\\\B11764517.tmp" into table t1;
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+--error ER_OPTION_PREVENTS_STATEMENT
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR\\\\..a..\\\\..\\\\..\\\\B11764517-2.tmp';
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR\\\\B11764517-2.tmp';
+
+--replace_result $MYSQL_TMP_DIR MYSQL_TMP_DIR
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR/B11764517-3.tmp';
+
+--replace_result $MYSQL_TMP_DIR_UCASE MYSQL_TMP_DIR_UCASE
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR_UCASE/B11764517-4.tmp';
+
+--replace_result $MYSQL_TMP_DIR_LCASE MYSQL_TMP_DIR_LCASE
+eval SELECT * FROM t1 INTO OUTFILE '$MYSQL_TMP_DIR_LCASE/B11764517-5.tmp';
+
+--error 0,1
+--remove_file $MYSQL_TMP_DIR/B11764517.tmp;
+--error 0,1
+--remove_file $MYSQL_TMP_DIR/B11764517-2.tmp;
+--error 0,1
+--remove_file $MYSQL_TMP_DIR/B11764517-3.tmp;
+--error 0,1
+--remove_file $MYSQL_TMP_DIR/B11764517-4.tmp;
+--error 0,1
+--remove_file $MYSQL_TMP_DIR/B11764517-5.tmp;
+DROP TABLE t1;

mysys/my_symlink.c

@@ -149,8 +149,23 @@ int my_realpath(char *to, const char *filename,
     result= -1;
   }
   DBUG_RETURN(result);
+#elif defined(_WIN32)
+  int ret= GetFullPathName(filename,FN_REFLEN, to, NULL);
+  if (ret == 0 || ret > FN_REFLEN)
+  {
+    my_errno= (ret > FN_REFLEN) ? ENAMETOOLONG : GetLastError();
+    if (MyFlags & MY_WME)
+      my_error(EE_REALPATH, MYF(0), filename, my_errno);
+    /* 
+      GetFullPathName didn't work : use my_load_path() which is a poor 
+      substitute original name but will at least be able to resolve 
+      paths that starts with '.'.
+    */  
+    my_load_path(to, filename, NullS);
+    return -1;
+  }
 #else
   my_load_path(to, filename, NullS);
-  return 0;
 #endif  
+  return 0;
 }

sql/item_strfunc.cc

@@ -2843,8 +2843,7 @@ String *Item_load_file::val_str(String *str)
 		   MY_RELATIVE_PATH | MY_UNPACK_FILENAME);
 
   /* Read only allowed from within dir specified by secure_file_priv */
-  if (opt_secure_file_priv &&
-      strncmp(opt_secure_file_priv, path, strlen(opt_secure_file_priv)))
+  if (!is_secure_file_path(path))
     goto err;
 
   if (!my_stat(path, &stat_info, MYF(0)))

sql/mysql_priv.h

@@ -1264,6 +1264,8 @@ bool init_errmessage(void);
 
 bool fn_format_relative_to_data_home(my_string to, const char *name,
 				     const char *dir, const char *extension);
+bool is_secure_file_path(char *path);
+
 File open_binlog(IO_CACHE *log, const char *log_file_name,
                  const char **errmsg);
 

sql/mysqld.cc

@@ -7855,6 +7855,64 @@ fn_format_relative_to_data_home(my_string to, const char *name,
 }
 
 
+/**
+  Test a file path to determine if the path is compatible with the secure file
+  path restriction.
+ 
+  @param path null terminated character string
+
+  @return
+    @retval TRUE The path is secure
+    @retval FALSE The path isn't secure
+*/
+
+bool is_secure_file_path(char *path)
+{
+  char buff1[FN_REFLEN], buff2[FN_REFLEN];
+  size_t opt_secure_file_priv_len;
+  /*
+    All paths are secure if opt_secure_file_path is 0
+  */
+  if (!opt_secure_file_priv)
+    return TRUE;
+
+  opt_secure_file_priv_len= strlen(opt_secure_file_priv);
+
+  if (strlen(path) >= FN_REFLEN)
+    return FALSE;
+
+  if (my_realpath(buff1, path, 0))
+  {
+    /*
+      The supplied file path might have been a file and not a directory.
+    */
+    int length= (int) dirname_length(path);
+    if (length >= FN_REFLEN)
+      return FALSE;
+    memcpy(buff2, path, length);
+    buff2[length]= '\0';
+    if (length == 0 || my_realpath(buff1, buff2, 0))
+      return FALSE;
+  }
+  convert_dirname(buff2, buff1, NullS);
+  if (!lower_case_file_system)
+  {
+    if (strncmp(opt_secure_file_priv, buff2, opt_secure_file_priv_len))
+      return FALSE;
+  }
+  else
+  {
+    if (files_charset_info->coll->strnncoll(files_charset_info,
+                                            (uchar *) buff2, strlen(buff2),
+                                            (uchar *) opt_secure_file_priv,
+                                            opt_secure_file_priv_len,
+                                            TRUE))
+      return FALSE;
+  }
+  return TRUE;
+}
+
+
 static void fix_paths(void)
 {
   char buff[FN_REFLEN],*pos;

sql/sql_class.cc

@@ -1211,8 +1211,7 @@ static File create_file(THD *thd, char *path, sql_exchange *exchange,
   else
     (void) fn_format(path, exchange->file_name, mysql_real_data_home, "", option);
 
-  if (opt_secure_file_priv &&
-      strncmp(opt_secure_file_priv, path, strlen(opt_secure_file_priv)))
+  if (!is_secure_file_path(path))
   {
     /* Write only allowed to dir or subdir specified by secure_file_priv */
     my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");

sql/sql_load.cc

@@ -287,9 +287,18 @@ int mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
     {
       (void) fn_format(name, ex->file_name, mysql_real_data_home, "",
 		       MY_RELATIVE_PATH | MY_UNPACK_FILENAME);
+    }
+
+    if (!is_secure_file_path(name))
+    {
+      /* Read only allowed from within dir specified by secure_file_priv */
+      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
+      DBUG_RETURN(TRUE);
+    }
+
 #if !defined(__WIN__) && !defined(OS2) && ! defined(__NETWARE__)
     MY_STAT stat_info;
-      if (!my_stat(name,&stat_info,MYF(MY_WME)))
+    if (!my_stat(name, &stat_info, MYF(MY_WME)))
       DBUG_RETURN(TRUE);
 
     // if we are not in slave thread, the file must be:
@@ -298,25 +307,16 @@ int mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
 #ifndef __EMX__
           (stat_info.st_mode & S_IFLNK) != S_IFLNK &&  // and not a symlink
 #endif
-	    ((stat_info.st_mode & S_IFREG) == S_IFREG ||
-	     (stat_info.st_mode & S_IFIFO) == S_IFIFO)))
+          ((stat_info.st_mode & S_IFREG) == S_IFREG || // and a regular file
+           (stat_info.st_mode & S_IFIFO) == S_IFIFO))) // or FIFO
     {
       my_error(ER_TEXTFILE_NOT_READABLE, MYF(0), name);
       DBUG_RETURN(TRUE);
     }
     if ((stat_info.st_mode & S_IFIFO) == S_IFIFO)
-	is_fifo = 1;
+      is_fifo= 1;
 #endif
 
-      if (opt_secure_file_priv &&
-          strncmp(opt_secure_file_priv, name, strlen(opt_secure_file_priv)))
-      {
-        /* Read only allowed from within dir specified by secure_file_priv */
-        my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
-        DBUG_RETURN(TRUE);
-      }
-
-    }
     if ((file=my_open(name,O_RDONLY,MYF(MY_WME))) < 0)
       DBUG_RETURN(TRUE);
   }