Sql Injection Union in Buffalo

Remediating SQL injection UNION in Buffalo applications involves eliminating string concatenation in SQL queries and using parameterized statements or the ORM’s safe query builders. The primary fix is to replace raw query construction with sqlx.NamedQuery or pop.Eager/*pop.Q* for structured queries. For the earlier example, the corrected handler uses named parameters:

func UsersResource(c buffalo.Context) error {
    search := c.Param("search")
    query := "SELECT id, name, email FROM users WHERE name LIKE :search"
    var users []User
    if err := c.DB().NamedQuery(&users, query, map[string]interface{}{"search": "%" + search + "%"}); err != nil {
        return c.Error(500, err)
    }
    return c.Render(200, r.JSON(users))
}

Alternatively, using pop’s query builder avoids raw SQL entirely:

func UsersResource(c buffalo.Context) error {
    search := c.Param("search")
    var users []User
    q := c.DB().Where("name ILIKE ?", "%"+search+"%");
    if err := q.All(&users); err != nil {
        return c.Error(500, err)
    }
    return c.Render(200, r.JSON(users))
}

These approaches ensure user input is treated as data, not executable SQL. Additionally, apply input validation: restrict search to alphanumeric characters and spaces using github.com/go-playground/validator/v10 in Buffalo’s middleware. For example, add a validator tag to a struct:

type UserSearch struct {
    Search string `form:"search" validate:"alphanumspace"`
}

Then validate in the handler:

var us UserSearch
if err := c.Bind(&us); err != nil {
    return c.Error(400, err)
}
if err := c.Validate(&us); err != nil {
    return c.Error(400, err)
}
// use us.Search safely

These fixes align with OWASP API Security Top 10 2023’s A03:2023 – Injection. middleBrick’s remediation guidance would recommend these specific Buffalo patterns, noting that ORM usage alone isn’t sufficient if raw SQL is used unsafely.