这是SQL查询,注入安全

Question

我认为初始代码很好:

SqlCommand param = new SqlCommand();
SqlGeometry point = SqlGeometry.Point(center_lat,center_lng,0);
SqlGeometry poly = SqlGeometry.STPolyFromText(new SqlChars(new SqlString(polygon)),0);
param.CommandText = "INSERT INTO Circle (Center_Point, Circle_Data) VALUES (@point,@poly);";
param.Parameters.Add(new SqlParameter("@point", SqlDbType.Udt));
param.Parameters.Add(new SqlParameter("@poly", SqlDbType.Udt));
param.Parameters["@point"].UdtTypeName = "geometry";
param.Parameters["@poly"].UdtTypeName = "geometry";
param.Parameters["@point"].Value = point;
param.Parameters["@poly"].Value = poly;

但是我意识到polygon创建字符串时可能会出现问题.

在javascript中 - 我这样创建它:

var Circle_Data = "POLYGON ((";
for (var x = 0; x < pointsToSql.length; x++) { // formatting = 0 0, 150 0, 150 50 etc
    if (x == 360) { Circle_Data += pointsToSql[x].lat.toString() + " " + pointsToSql[x].lng.toString() + "))"; }
    else { Circle_Data += pointsToSql[x].lat.toString() + " " + pointsToSql[x].lng.toString() + ","; }
}

然后将其传递给C#.这样安全吗？即使查询中发生了参数化？

Answer 1

使用参数,您将从SQL注入中保存,如果在POLYGON字符串中注入了一些SQL ,它将在SQL Server端错误输出.

例如,如果你有:

POLYGON(12.33 12.55,13.55; DROP TABLE students;)

SQL服务器将尝试基于传递的字符串构造几何类型,并且它将无法执行此操作.