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check for signature type validity; if not valid, don't process and don't print

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This commit is contained in:
iadgovuser58 2024-05-08 17:41:10 -04:00
parent a903b0e448
commit 99f93d521a
5 changed files with 80 additions and 37 deletions
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6
HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/uefi/UefiSignatureData.java
View File

@ -161,10 +161,10 @@ public class UefiSignatureData {
sigInfo = status;
} else {
if (signatureType.getVendorTableReference().equals("EFI_CERT_SHA256_GUID")) {
sigInfo += "UEFI Signature Owner = " + efiVarGuid.toString() + "\n";
sigInfo += " Binary Hash = " + HexUtils.byteArrayToHexString(binaryHash) + "\n";
sigInfo += " UEFI Signature Owner = " + efiVarGuid.toString() + "\n";
sigInfo += " Binary Hash = " + HexUtils.byteArrayToHexString(binaryHash) + "\n";
} else {
sigInfo += "UEFI Signature Owner = " + efiVarGuid.toString() + "\n";
sigInfo += " UEFI Signature Owner = " + efiVarGuid.toString() + "\n";
sigInfo += cert.toString();
}
}

53
HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/uefi/UefiSignatureList.java
View File

@ -47,11 +47,16 @@ public class UefiSignatureList {
/**
* Signature validity.
*/
private boolean valid = true;
@Getter
private boolean signatureTypeValid = false;
/**
* Current status.
* Data validity.
*/
private String status = "Signature List is Valid";
private boolean dataValid = true;
/**
* Current status of Signature List data.
*/
private String dataStatus = "Signature List data validity is undetermined yet";
/**
* Array List of Signature found in the list.
*/
@ -110,17 +115,23 @@ public class UefiSignatureList {
lists.read(guid);
signatureType = new UefiGuid(guid);
// if signatureType is invalid, don't even process any of the data
// however, if signatureTYpe is valid, but some of the data later on is invalid, that will
// be caught when UefiSignatureData is processed
if (!isValidSigListGUID(signatureType)) {
processSignatureData(lists);
//processSignatureData(lists);
signatureTypeValid = false;
} else { // valid SigData Processing
byte[] lSize = new byte[UefiConstants.SIZE_4];
signatureTypeValid = true;
byte[] lSize = new byte[UefiConstants.SIZE_4]; // signature list size
lists.read(lSize);
listSize = HexUtils.leReverseInt(lSize);
byte[] hSize = new byte[UefiConstants.SIZE_4];
byte[] hSize = new byte[UefiConstants.SIZE_4]; // signature header size
lists.read(hSize);
byte[] sSize = new byte[UefiConstants.SIZE_4];
byte[] sSize = new byte[UefiConstants.SIZE_4]; // signature size
lists.read(sSize);
signatureSize = listSize - UefiConstants.SIZE_28;
sigData = new byte[signatureSize];
@ -143,8 +154,8 @@ public class UefiSignatureList {
while (efiSigDataIS.available() > 0) {
UefiSignatureData tmpSigData = new UefiSignatureData(efiSigDataIS, signatureType);
if (!tmpSigData.isValid()) {
valid = false;
status = tmpSigData.getStatus();
dataValid = false;
dataStatus = tmpSigData.getStatus();
break;
}
sigList.add(tmpSigData);
@ -165,8 +176,8 @@ public class UefiSignatureList {
while (sigDataIS.available() > 0) {
UefiSignatureData tmpigData = new UefiSignatureData(sigDataIS, signatureType);
if (!tmpigData.isValid()) {
valid = false;
status = tmpigData.getStatus();
dataValid = false;
dataStatus = tmpigData.getStatus();
break;
}
sigList.add(tmpigData);
@ -201,15 +212,21 @@ public class UefiSignatureList {
*/
public String toString() {
StringBuilder sigInfo = new StringBuilder();
sigInfo.append("UEFI Signature List Type = " + signatureType.toString() + "\n");
sigInfo.append("Number if items = " + numberOfCerts + "\n");
for (int i = 0; i < sigList.size(); i++) {
UefiSignatureData certData = sigList.get(i);
sigInfo.append(certData.toString());
if (!signatureTypeValid) {
sigInfo.append(" *** Unknown UEFI Signature Type encountered: " + signatureType.toString() + "\n");
}
if (!valid) {
sigInfo.append("*** Invalid UEFI Signature data encountered: " + status + "\n");
else {
sigInfo.append(" UEFI Signature List Type = " + signatureType.toString() + "\n");
sigInfo.append(" Number if items (certs, hashes, etc) = " + numberOfCerts + "\n");
for (int i = 0; i < sigList.size(); i++) {
UefiSignatureData certData = sigList.get(i);
sigInfo.append(certData.toString());
}
if (!dataValid) {
sigInfo.append(" *** Invalid UEFI Signature data encountered: " + dataStatus + "\n");
}
}
return sigInfo.toString();
}

36
HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/uefi/UefiVariable.java
View File

@ -38,6 +38,14 @@ public class UefiVariable {
*/
@Getter
private String efiVarName = "";
/**
* Encountered invalid UEFI Signature List
*/
private boolean invalidSignatureListEncountered = false;
/**
* Invalid UEFI Signature List
*/
private String invalidSignatureListStatus = "";
/**
* UEFI defined Boot Variable.
*/
@ -122,7 +130,7 @@ public class UefiVariable {
}
/**
* Processes the data as a UEFI defined Signature List.
* Processes the data as a list of UEFI defined Signature Lists.
*
* @param data the bye array holding the Signature List.
* @throws java.security.cert.CertificateException If there a problem
@ -138,6 +146,12 @@ public class UefiVariable {
while (certData.available() > 0) {
UefiSignatureList list;
list = new UefiSignatureList(certData);
// efiVariableSigListContents += list.toString();
if(!list.isSignatureTypeValid()) {
invalidSignatureListEncountered = true;
invalidSignatureListStatus = list.toString();
break;
}
certSuperList.add(list);
}
}
@ -150,11 +164,11 @@ public class UefiVariable {
public String toString() {
StringBuilder efiVariable = new StringBuilder();
efiVariable.append("UEFI Variable Name:" + efiVarName + "\n");
efiVariable.append("UEFI_GUID = " + uefiVarGuid.toString() + "\n ");
efiVariable.append("UEFI Variable GUID = " + uefiVarGuid.toString() + "\n");
if (efiVarName != "") {
efiVariable.append("UEFI Variable Contents => " + "\n ");
efiVariable.append("UEFI Variable Contents => " + "\n");
}
String tmpName = efiVarName;
String tmpName = "";
if (efiVarName.contains("Boot00")) {
tmpName = "Boot00";
} else {
@ -165,6 +179,11 @@ public class UefiVariable {
case "MokList":
efiVariable.append(printCert(uefiVariableData, 0));
break;
case "PK":
case "KEK":
case "db":
case "dbx":
break;
case "Boot00":
efiVariable.append(bootv.toString());
break;
@ -177,14 +196,19 @@ public class UefiVariable {
default:
if (!tmpName.isEmpty()) {
efiVariable.append(String.format("Data not provided for "
+ "UEFI variable named %s ", tmpName));
+ "UEFI variable named %s \n", tmpName));
} else {
efiVariable.append("Data not provided ");
efiVariable.append("Data not provided \n");
}
}
for (UefiSignatureList uefiSigList : certSuperList) {
efiVariable.append(uefiSigList.toString());
}
if(invalidSignatureListEncountered) {
efiVariable.append(invalidSignatureListStatus);
efiVariable.append("*** Encountered invalid Signature Type - " +
"Stopped processing of this event data\n");
}
return efiVariable.toString();
}

14
HIRS_Utils/src/main/java/hirs/utils/tpm/eventlog/uefi/UefiX509Cert.java
View File

@ -80,14 +80,14 @@ public class UefiX509Cert {
public String toString() {
X509Certificate x509Cert = (X509Certificate) cert;
String certData = "";
certData += " Certificate Serial Number = "
certData += " Certificate Serial Number = "
+ x509Cert.getSerialNumber().toString(UefiConstants.SIZE_16) + "\n";
certData += " Subject DN = " + x509Cert.getSubjectX500Principal().getName() + "\n";
certData += " Issuer DN = " + x509Cert.getIssuerX500Principal().getName() + "\n";
certData += " Not Before Date = " + x509Cert.getNotBefore() + "\n";
certData += " Not After Date = " + x509Cert.getNotAfter() + "\n";
certData += " Signature Algorithm = " + x509Cert.getSigAlgName() + "\n";
certData += " SHA1 Fingerprint = " + getSHA1FingerPrint() + "\n";
certData += " Subject DN = " + x509Cert.getSubjectX500Principal().getName() + "\n";
certData += " Issuer DN = " + x509Cert.getIssuerX500Principal().getName() + "\n";
certData += " Not Before Date = " + x509Cert.getNotBefore() + "\n";
certData += " Not After Date = " + x509Cert.getNotAfter() + "\n";
certData += " Signature Algorithm = " + x509Cert.getSigAlgName() + "\n";
certData += " SHA1 Fingerprint = " + getSHA1FingerPrint() + "\n";
return certData;
}
}

8
tools/tcg_eventlog_tool/src/main/java/hirs/tcg_eventlog/Main.java
View File

@ -11,6 +11,7 @@ import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import hirs.utils.tpm.eventlog.TCGEventLog;
import hirs.utils.tpm.eventlog.TpmPcrEvent;
import hirs.utils.HexUtils;
@ -50,7 +51,7 @@ final class Main {
try {
outputStream = new FileOutputStream(commander.getOutputFileName());
System.out.print("Writing to output file: " + commander.getOutputFileName()
+ "\n");
+ "\n");
} catch (Exception e) {
System.out.print("Error opening output file" + commander.getOutputFileName()
+ "\nError was " + e.getMessage());
@ -217,7 +218,7 @@ final class Main {
}
} catch (IOException e) {
System.out.print("Error writing to output file: " + commander.getOutputFileName()
+ "\n error was: " + e.toString() + "\n");
+ "\n error was: " + e.toString() + "\n");
e.printStackTrace();
}
}
@ -248,7 +249,7 @@ final class Main {
eventLog2.getEventList(), commander.getPcrNumber());
if (errors.isEmpty() && !bHexFlag) {
sb.append("\nEvent Log " + logFileName1 + " MATCHED EventLog " + logFileName2
+ "\n");
+ "\n");
} else {
if (!errors.isEmpty() && !bHexFlag) {
sb.append("\nEvent Log " + logFileName1
@ -333,6 +334,7 @@ final class Main {
}
return matchFound;
}
/**
* Diagnostic method for detecting flag settings.
*/