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C#: Increasing required size of RSA key to 2048

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This commit is contained in:
Faten Healy
2020-09-10 16:28:02 +10:00
committed by Tamas Vajk
parent f4f47bd5ed
commit c35a5d120a
5 changed files with 17 additions and 17 deletions
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8
csharp/ql/src/Security Features/InsufficientKeySize.cs
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@@ -11,7 +11,7 @@ namespace InsufficientKeySize
{
try
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(512); // BAD
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024); // BAD
rsa.ImportParameters(key);
return rsa.Encrypt(plaintext, true);
}
@@ -27,7 +27,7 @@ namespace InsufficientKeySize
try
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); // BAD
rsa = new RSACryptoServiceProvider(1024); // GOOD
rsa = new RSACryptoServiceProvider(2048); // GOOD
rsa.ImportParameters(key);
return rsa.Encrypt(plaintext, true);
}
@@ -58,7 +58,7 @@ namespace InsufficientKeySize
try
{
DSACryptoServiceProvider dsa = new DSACryptoServiceProvider(); // BAD
dsa = new DSACryptoServiceProvider(1024); // GOOD
dsa = new DSACryptoServiceProvider(2048); // GOOD
dsa.ImportParameters(key);
return dsa.SignData(plaintext);
}
@@ -121,7 +121,7 @@ namespace InsufficientKeySize
try
{
// Create a new instance of DSACryptoServiceProvider.
using (DSACryptoServiceProvider DSA = new DSACryptoServiceProvider(1024)) // GOOD
using (DSACryptoServiceProvider DSA = new DSACryptoServiceProvider(2048)) // GOOD
{
// Import the key information.
DSA.ImportParameters(DSAKeyInfo);

2
csharp/ql/src/Security Features/InsufficientKeySize.qhelp
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@@ -8,7 +8,7 @@ are vulnerable to brute force attack when too small a key size is used.</p>
</overview>
<recommendation>
<p>The key should be at least 1024-bit long when using RSA encryption, and 128-bit long when using
<p>The key should be at least 2048-bit long when using RSA encryption, and 128-bit long when using
symmetric encryption.</p>
</recommendation>

8
csharp/ql/src/Security Features/InsufficientKeySize.ql
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@@ -29,8 +29,8 @@ predicate incorrectUseOfDSA(ObjectCreation e, string msg) {
.getTarget()
.getDeclaringType()
.hasQualifiedName("System.Security.Cryptography", "DSACryptoServiceProvider") and
exists(Expr i | e.getArgument(0) = i and i.getValue().toInt() < 1024) and
msg = "Key size should be at least 1024 bits for DSA encryption."
exists(Expr i | e.getArgument(0) = i and i.getValue().toInt() < 2048) and
msg = "Key size should be at least 2048 bits for DSA encryption."
}
predicate incorrectUseOfRSA(ObjectCreation e, string msg) {
@@ -38,8 +38,8 @@ predicate incorrectUseOfRSA(ObjectCreation e, string msg) {
.getTarget()
.getDeclaringType()
.hasQualifiedName("System.Security.Cryptography", "RSACryptoServiceProvider") and
exists(Expr i | e.getArgument(0) = i and i.getValue().toInt() < 1024) and
msg = "Key size should be at least 1024 bits for RSA encryption."
exists(Expr i | e.getArgument(0) = i and i.getValue().toInt() < 2048) and
msg = "Key size should be at least 2048 bits for RSA encryption."
}
from Expr e, string msg

12
csharp/ql/test/query-tests/Security Features/CWE-327/InsufficientKeySize/InsufficientKeySize.cs
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@@ -13,18 +13,18 @@ public class InsufficientKeySize
// GOOD: Key size is greater than 128
new RC2CryptoServiceProvider().EffectiveKeySize = 256;
// BAD: Key size is less than 1024.
// BAD: Key size is less than 2048.
DSACryptoServiceProvider dsaBad = new DSACryptoServiceProvider(512);
// GOOD: Key size defaults to 1024.
// GOOD: Key size defaults to 2048.
DSACryptoServiceProvider dsaGood1 = new DSACryptoServiceProvider();
// GOOD: Key size is greater than 1024.
// GOOD: Key size is greater than 2048.
DSACryptoServiceProvider dsaGood2 = new DSACryptoServiceProvider(2048);
// BAD: Key size is less than 1024.
// BAD: Key size is less than 2048.
RSACryptoServiceProvider rsaBad = new RSACryptoServiceProvider(512);
// GOOD: Key size defaults to 1024.
// GOOD: Key size defaults to 2048.
RSACryptoServiceProvider rsaGood1 = new RSACryptoServiceProvider();
// GOOD: Key size is greater than 1024.
// GOOD: Key size is greater than 2048.
RSACryptoServiceProvider rsaGood2 = new RSACryptoServiceProvider(2048);
}
}

4
csharp/ql/test/query-tests/Security Features/CWE-327/InsufficientKeySize/InsufficientKeySize.expected
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@@ -1,3 +1,3 @@
| InsufficientKeySize.cs:10:9:10:60 | ... = ... | Key size should be at least 128 bits for RC2 encryption. |
| InsufficientKeySize.cs:17:43:17:75 | object creation of type DSACryptoServiceProvider | Key size should be at least 1024 bits for DSA encryption. |
| InsufficientKeySize.cs:24:43:24:75 | object creation of type RSACryptoServiceProvider | Key size should be at least 1024 bits for RSA encryption. |
| InsufficientKeySize.cs:17:43:17:75 | object creation of type DSACryptoServiceProvider | Key size should be at least 2048 bits for DSA encryption. |
| InsufficientKeySize.cs:24:43:24:75 | object creation of type RSACryptoServiceProvider | Key size should be at least 2048 bits for RSA encryption. |