Git-Mirrors/constellation
1
0
Fork 0
mirror of https://github.com/edgelesssys/constellation.git synced 2024-12-25 15:39:37 -05:00
Code Issues Packages Projects Releases Wiki Activity

Fix invalid slice access in validateAk (#437)

Browse Source
This commit is contained in:
Otto Bittner 2022-11-03 09:57:59 +01:00 committed by GitHub
parent 1f9a788c21
commit 0887bc540f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
internal/attestation/azure/snp/validator.go
View File

@ -275,6 +275,9 @@ func (a *azureInstanceInfo) validateAk(runtimeDataRaw []byte, reportData []byte,
}
sum := sha256.Sum256(runtimeDataRaw)
if len(reportData) < len(sum) {
return fmt.Errorf("reportData has unexpected size: %d", len(reportData))
}
if !bytes.Equal(sum[:], reportData[:len(sum)]) {
return errors.New("unexpected runtimeData digest in TPM")
}
@ -284,7 +287,7 @@ func (a *azureInstanceInfo) validateAk(runtimeDataRaw []byte, reportData []byte,
}
rawN, err := base64.RawURLEncoding.DecodeString(runtimeData.Keys[0].N)
if err != nil {
return err
return fmt.Errorf("decoding modulus string: %w", err)
}
if !bytes.Equal(rawN, rsaParameters.ModulusRaw) {
return fmt.Errorf("unexpected modulus value in TPM")
@ -292,7 +295,7 @@ func (a *azureInstanceInfo) validateAk(runtimeDataRaw []byte, reportData []byte,
rawE, err := base64.RawURLEncoding.DecodeString(runtimeData.Keys[0].E)
if err != nil {
return err
return fmt.Errorf("decoding exponent string: %w", err)
}
paddedRawE := make([]byte, 4)
copy(paddedRawE, rawE)