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Fixes validation of input bytes in the Base64 decoder (#9623)

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Motivation:
In the current implementation of Base64 decoder an invalid
character `\u00BD` treated as `=`.
Also character `\u007F` leads to ArrayIndexOutOfBoundsException.

Modification:
Explicitly checks that all input bytes are ASCII characters
(greater than zero). Fix `decodabet` tables.

Result:
Correctly validation input bytes in Base64 decoder.
This commit is contained in:
Nikolay Fedorovskikh 2019-10-10 23:45:44 +05:00 committed by Norman Maurer
parent 35862cad7e
commit 08e9b456a4
3 changed files with 63 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
codec/src/main/java/io/netty/handler/codec/base64/Base64.java
View File

@ -331,8 +331,6 @@ public final class Base64 {
private static final class Decoder implements ByteProcessor {
private final byte[] b4 = new byte[4];
private int b4Posn;
private byte sbiCrop;
private byte sbiDecode;
private byte[] decodabet;
private int outBuffPosn;
private ByteBuf dest;
@ -353,26 +351,24 @@ public final class Base64 {
@Override
public boolean process(byte value) throws Exception {
sbiCrop = (byte) (value & 0x7f); // Only the low seven bits
sbiDecode = decodabet[sbiCrop];
if (value > 0) {
byte sbiDecode = decodabet[value];
if (sbiDecode >= WHITE_SPACE_ENC) { // White space, Equals sign or better
if (sbiDecode >= EQUALS_SIGN_ENC) { // Equals sign or better
b4[b4Posn ++] = sbiCrop;
b4[b4Posn ++] = value;
if (b4Posn > 3) { // Quartet built
outBuffPosn += decode4to3(b4, dest, outBuffPosn, decodabet);
b4Posn = 0;
// If that was the equals sign, break out of 'for' loop
if (sbiCrop == EQUALS_SIGN) {
return false;
}
return value != EQUALS_SIGN;
}
}
return true;
}
}
throw new IllegalArgumentException(
"invalid bad Base64 input character: " + (short) (value & 0xFF) + " (decimal)");
"invalid Base64 input character: " + (short) (value & 0xFF) + " (decimal)");
}
private static int decode4to3(byte[] src, ByteBuf dest, int destOffset, byte[] decodabet) {

66
codec/src/main/java/io/netty/handler/codec/base64/Base64Dialect.java
View File

@ -67,17 +67,17 @@ public enum Base64Dialect {
-9, -9, -9, -9, -9, -9, // Decimal 91 - 96
26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
-9, -9, -9, -9, // Decimal 123 - 126
/* -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
-9, -9, -9, -9, -9 // Decimal 123 - 127
/* -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 140
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 141 - 153
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 154 - 166
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 167 - 179
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 180 - 192
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 193 - 205
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 206 - 218
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 219 - 231
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 232 - 244
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 245 - 255 */
}, true),
/**
* Base64-like encoding that is URL-safe as described in the Section 4 of
@ -126,17 +126,17 @@ public enum Base64Dialect {
-9, // Decimal 96
26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm'
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z'
-9, -9, -9, -9, // Decimal 123 - 126
/*-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
-9, -9, -9, -9, -9, // Decimal 123 - 127
/* -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 140
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 141 - 153
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 154 - 166
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 167 - 179
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 180 - 192
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 193 - 205
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 206 - 218
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 219 - 231
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 232 - 244
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 245 - 255 */
}, false),
/**
* Special "ordered" dialect of Base64 described in
@ -182,17 +182,17 @@ public enum Base64Dialect {
-9, // Decimal 96
38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, // Letters 'a' through 'm'
51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, // Letters 'n' through 'z'
-9, -9, -9, -9, // Decimal 123 - 126
/* -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */
-9, -9, -9, -9, -9 // Decimal 123 - 127
/* -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 128 - 140
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 141 - 153
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 154 - 166
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 167 - 179
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 180 - 192
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 193 - 205
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 206 - 218
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 219 - 231
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 232 - 244
-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 245 - 255 */
}, true);
final byte[] alphabet;

18
codec/src/test/java/io/netty/handler/codec/base64/Base64Test.java
View File

@ -29,7 +29,7 @@ import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import static io.netty.buffer.Unpooled.copiedBuffer;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.*;
public class Base64Test {
@ -169,4 +169,20 @@ public class Base64Test {
public void testOverflowDecodedBufferSize() {
assertEquals(1610612736, Base64.decodedBufferSize(Integer.MAX_VALUE));
}
@Test
public void decodingFailsOnInvalidInputByte() {
char[] invalidChars = {'\u007F', '\u0080', '\u00BD', '\u00FF'};
for (char invalidChar : invalidChars) {
ByteBuf buf = copiedBuffer("eHh4" + invalidChar, CharsetUtil.ISO_8859_1);
try {
Base64.decode(buf);
fail("Invalid character in not detected: " + invalidChar);
} catch (IllegalArgumentException ignored) {
// as expected
} finally {
assertTrue(buf.release());
}
}
}
}