我试图弄清楚如何使用3个表中的数据进行身份验证，然后根据使用的表重定向到不同的页面。我有第一个工作（即使用1个表）问题是当我尝试使用2/3表时。
（我知道SQL注入等我刚刚让页面变得非常简单，试着让它首先工作：））
任何帮助都会因为它让我疯狂而非常适合
继承人正在努力
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void _login_Click(object sender, EventArgs e)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Testconnection"].ConnectionString);
conn.Open();
string Checkuser = "Select count(*) from dbo.loginuser where username='" + Textusername.Text + "'";
SqlCommand com = new SqlCommand(Checkuser, conn);
int temp = Convert.ToInt32(com.ExecuteScalar().ToString());
conn.Close();
if (temp == 1)
{
conn.Open();
string checkPasswordQuery = "select password from dbo.loginuser where username='" + Textusername.Text + "'";
SqlCommand passComm = new SqlCommand(checkPasswordQuery, conn);
string password = passComm.ExecuteScalar().ToString().Replace(" ", "");
if (password == textpassword.Text)
{
Session["New"] = Textusername.Text;
Response.Redirect("Reporthome.aspx");
}
}
else
{
conn.Open();
string Checkuser1 = "Select count(*) from dbo.employee where idno='" + Textusername.Text + "'";
SqlCommand com1 = new SqlCommand(Checkuser1, conn);
int temp1 = Convert.ToInt32(com.ExecuteScalar().ToString());
conn.Close();
if (temp1 == 1)
{
conn.Open();
string checkPasswordQuery1 = "select epass from dbo.employee where idno='" + Textusername.Text + "'";
SqlCommand passComm1 = new SqlCommand(checkPasswordQuery1, conn);
string epass = passComm1.ExecuteScalar().ToString().Replace(" ", "");
if (epass == textpassword.Text)
{
Session["New"] = Textusername.Text;
Response.Redirect("Engineerhome.aspx");
}
else
{
Response.Write("password is incorrect");
}
}
}
}
}
答案 0 :(得分：0)
为什么不尝试使用存储过程并让数据库处理它。如果这三个表具有相同的列或字段，则为所有三个表提供UNION ALL，并将您的凭据传递给存储过程。
处理选择中的整个三个表。还要确保一旦到达那里为您的密码加盐并相应加密并保存产品。
尝试类似......
public class PasswordHash{
public static final String PBKDF2_ALGORITHM = "PBKDF2WithHmacSHA1";
// The following constants may be changed without breaking existing hashes.
public static final int SALT_BYTE_SIZE = 24;
public static final int HASH_BYTE_SIZE = 24;
public static final int PBKDF2_ITERATIONS = 1000;
public static final int ITERATION_INDEX = 0;
public static final int SALT_INDEX = 1;
public static final int PBKDF2_INDEX = 2;
/**
* Returns a salted PBKDF2 hash of the password.
*
* @param password the password to hash
* @return a salted PBKDF2 hash of the password
*/
public static String createHash(String password)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
return createHash(password.toCharArray());
}
/**
* Returns a salted PBKDF2 hash of the password.
*
* @param password the password to hash
* @return a salted PBKDF2 hash of the password
*/
public static String createHash(char[] password)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
// Generate a random salt
SecureRandom random = new SecureRandom();
byte[] salt = new byte[SALT_BYTE_SIZE];
random.nextBytes(salt);
// Hash the password
byte[] hash = pbkdf2(password, salt, PBKDF2_ITERATIONS, HASH_BYTE_SIZE);
// format iterations:salt:hash
return PBKDF2_ITERATIONS + ":" + toHex(salt) + ":" + toHex(hash);
}
/**
* Validates a password using a hash.
*
* @param password the password to check
* @param correctHash the hash of the valid password
* @return true if the password is correct, false if not
*/
public static boolean validatePassword(String password, String correctHash)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
return validatePassword(password.toCharArray(), correctHash);
}
/**
* Validates a password using a hash.
*
* @param password the password to check
* @param correctHash the hash of the valid password
* @return true if the password is correct, false if not
*/
public static boolean validatePassword(char[] password, String correctHash)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
// Decode the hash into its parameters
String[] params = correctHash.split(":");
int iterations = Integer.parseInt(params[ITERATION_INDEX]);
byte[] salt = fromHex(params[SALT_INDEX]);
byte[] hash = fromHex(params[PBKDF2_INDEX]);
// Compute the hash of the provided password, using the same salt,
// iteration count, and hash length
byte[] testHash = pbkdf2(password, salt, iterations, hash.length);
// Compare the hashes in constant time. The password is correct if
// both hashes match.
return slowEquals(hash, testHash);
}
/**
* Compares two byte arrays in length-constant time. This comparison method
* is used so that password hashes cannot be extracted from an on-line
* system using a timing attack and then attacked off-line.
*
* @param a the first byte array
* @param b the second byte array
* @return true if both byte arrays are the same, false if not
*/
private static boolean slowEquals(byte[] a, byte[] b)
{
int diff = a.length ^ b.length;
for(int i = 0; i < a.length && i < b.length; i++)
diff |= a[i] ^ b[i];
return diff == 0;
}
/**
* Computes the PBKDF2 hash of a password.
*
* @param password the password to hash.
* @param salt the salt
* @param iterations the iteration count (slowness factor)
* @param bytes the length of the hash to compute in bytes
* @return the PBDKF2 hash of the password
*/
private static byte[] pbkdf2(char[] password, byte[] salt, int iterations, int bytes)
throws NoSuchAlgorithmException, InvalidKeySpecException
{
PBEKeySpec spec = new PBEKeySpec(password, salt, iterations, bytes * 8);
SecretKeyFactory skf = SecretKeyFactory.getInstance(PBKDF2_ALGORITHM);
return skf.generateSecret(spec).getEncoded();
}
/**
* Converts a string of hexadecimal characters into a byte array.
*
* @param hex the hex string
* @return the hex string decoded into a byte array
*/
private static byte[] fromHex(String hex)
{
byte[] binary = new byte[hex.length() / 2];
for(int i = 0; i < binary.length; i++)
{
binary[i] = (byte)Integer.parseInt(hex.substring(2*i, 2*i+2), 16);
}
return binary;
}
/**
* Converts a byte array into a hexadecimal string.
*
* @param array the byte array to convert
* @return a length*2 character string encoding the byte array
*/
private static String toHex(byte[] array)
{
BigInteger bi = new BigInteger(1, array);
String hex = bi.toString(16);
int paddingLength = (array.length * 2) - hex.length();
if(paddingLength > 0)
return String.format("%0" + paddingLength + "d", 0) + hex;
else
return hex;
}
/**
* Tests the basic functionality of the PasswordHash class
*
* @param args ignored
*/
public static void main(String[] args)
{
try
{
// Print out 10 hashes
for(int i = 0; i < 10; i++)
System.out.println(PasswordHash.createHash("p\r\nassw0Rd!"));
// Test password validation
boolean failure = false;
System.out.println("Running tests...");
for(int i = 0; i < 100; i++)
{
String password = ""+i;
String hash = createHash(password);
String secondHash = createHash(password);
if(hash.equals(secondHash)) {
System.out.println("FAILURE: TWO HASHES ARE EQUAL!");
failure = true;
}
String wrongPassword = ""+(i+1);
if(validatePassword(wrongPassword, hash)) {
System.out.println("FAILURE: WRONG PASSWORD ACCEPTED!");
failure = true;
}
if(!validatePassword(password, hash)) {
System.out.println("FAILURE: GOOD PASSWORD NOT ACCEPTED!");
failure = true;
}
}
if(failure)
System.out.println("TESTS FAILED!");
else
System.out.println("TESTS PASSED!");
}
catch(Exception ex)
{
System.out.println("ERROR: " + ex);
}
}
}
答案 1 :(得分：0)
由于您的两个编码元素非常相似，您还可以创建一个对两个元素都通用的单独例程，例如此版本的EmpPassword：
private string EmpPassword(string sqlText, System.Data.SqlClient.SqlConnection openConnection)
{
object obj = null;
using (var cmd = new System.Data.SqlClient.SqlCommand(sqlText, openConnection))
{
using (var r = cmd.ExecuteReader())
{
if (r.Read())
{
obj = r.GetValue(0);
}
}
}
if ((obj != null) && (obj != DBNull.Value))
{
return obj.ToString().Replace(" ", "");
}
return null;
}
您的_login_Click事件可以使用相同的数据库连接对象调用您的每个数据库，具体取决于结果：
protected void _login_Click(object sender, EventArgs e)
{
using (var con = new System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings["Testconnection"].ConnectionString))
{
Session["New"] = null;
try
{
con.Open();
var sqlText = String.Format("SELECT password FROM dbo.loginuser WHERE username='{0}';", Textusername.Text);
var sqlResult = EmpPassword(sqlText, con);
if (sqlResult == textpassword.Text)
{
Session["New"] = Textusername.Text;
Response.Redirect("Reporthome.aspx");
}
else
{
sqlText = String.Format("Select epass from dbo.employee where idno='{0}';", Textusername.Text);
sqlResult = EmpPassword(sqlText, con);
if (sqlResult == textpassword.Text)
{
Session["New"] = Textusername.Text;
Response.Redirect("Engineerhome.aspx");
}
else
{
Response.Write("password is incorrect");
}
}
}
finally
{
con.Close();
}
}
}
注意我在两者上都跳过了SELECT Count(*)选项。如果用户存在于表中，则将返回该用户。
当然，如果您的架构允许具有相同用户ID的多个实例，那么这将无效。