IOSC: Implement ImportCertificate

Same as VerifyPublicKeySign, we currently only support RSA keys
(which is all we need right now).

Source/Core/Core/IOS/IOSC.cpp

@@ -19,6 +19,7 @@
 #include "Common/Crypto/AES.h"
 #include "Common/Crypto/ec.h"
 #include "Common/ScopeGuard.h"
+#include "Common/Swap.h"
 #include "Core/IOS/Device.h"
 #include "Core/IOS/IOSC.h"
 #include "Core/ec_wii.h"
@@ -243,6 +244,83 @@ ReturnCode IOSC::VerifyPublicKeySign(const std::array<u8, 20>& sha1, Handle sign
   }
 }
 
+struct ImportCertParameters
+{
+  size_t offset;
+  size_t size;
+  size_t signature_offset;
+  size_t public_key_offset;
+  size_t public_key_exponent_offset;
+};
+
+static ReturnCode GetImportCertParameters(const u8* cert, ImportCertParameters* parameters)
+{
+  // TODO: Add support for ECC signature type.
+  const u32 signature_type = Common::swap32(cert + offsetof(Cert, type));
+  switch (static_cast<SignatureType>(signature_type))
+  {
+  case SignatureType::RSA2048:
+  {
+    const u32 key_type = Common::swap32(cert + offsetof(Cert, rsa2048.header.public_key_type));
+
+    // TODO: Add support for ECC public key type.
+    if (static_cast<PublicKeyType>(key_type) != PublicKeyType::RSA2048)
+      return IOSC_INVALID_FORMAT;
+
+    parameters->offset = offsetof(Cert, rsa2048.signature.issuer);
+    parameters->size = sizeof(Cert::rsa2048) - parameters->offset;
+    parameters->signature_offset = offsetof(Cert, rsa2048.signature.sig);
+    parameters->public_key_offset = offsetof(Cert, rsa2048.public_key);
+    parameters->public_key_exponent_offset = offsetof(Cert, rsa2048.exponent);
+    return IPC_SUCCESS;
+  }
+  case SignatureType::RSA4096:
+  {
+    parameters->offset = offsetof(Cert, rsa4096.signature.issuer);
+    parameters->size = sizeof(Cert::rsa4096) - parameters->offset;
+    parameters->signature_offset = offsetof(Cert, rsa4096.signature.sig);
+    parameters->public_key_offset = offsetof(Cert, rsa4096.public_key);
+    parameters->public_key_exponent_offset = offsetof(Cert, rsa4096.exponent);
+    return IPC_SUCCESS;
+  }
+  default:
+    WARN_LOG(IOS, "Unknown signature type: %08x", signature_type);
+    return IOSC_INVALID_FORMAT;
+  }
+}
+
+ReturnCode IOSC::ImportCertificate(const u8* cert, Handle signer_handle, Handle dest_handle,
+                                   u32 pid)
+{
+  if (!HasOwnership(signer_handle, pid) || !HasOwnership(dest_handle, pid))
+    return IOSC_EACCES;
+
+  const KeyEntry* signer_entry = FindEntry(signer_handle, SearchMode::IncludeRootKey);
+  const KeyEntry* dest_entry = FindEntry(dest_handle, SearchMode::IncludeRootKey);
+  if (!signer_entry || !dest_entry)
+    return IOSC_EINVAL;
+
+  if (signer_entry->type != TYPE_PUBLIC_KEY || dest_entry->type != TYPE_PUBLIC_KEY)
+    return IOSC_INVALID_OBJTYPE;
+
+  ImportCertParameters parameters;
+  const ReturnCode ret = GetImportCertParameters(cert, &parameters);
+  if (ret != IPC_SUCCESS)
+    return ret;
+
+  std::array<u8, 20> sha1;
+  mbedtls_sha1(cert + parameters.offset, parameters.size, sha1.data());
+
+  if (VerifyPublicKeySign(sha1, signer_handle, cert + parameters.signature_offset, pid) !=
+      IPC_SUCCESS)
+  {
+    return IOSC_FAIL_CHECKVALUE;
+  }
+
+  return ImportPublicKey(dest_handle, cert + parameters.public_key_offset,
+                         cert + parameters.public_key_exponent_offset, pid);
+}
+
 ReturnCode IOSC::GetOwnership(Handle handle, u32* owner) const
 {
   const KeyEntry* entry = FindEntry(handle);

Source/Core/Core/IOS/IOSC.h

@@ -187,6 +187,8 @@ class IOSC final
 
   ReturnCode VerifyPublicKeySign(const std::array<u8, 20>& sha1, Handle signer_handle,
                                  const u8* signature, u32 pid) const;
+  // Import a certificate (signed by the certificate in signer_handle) into dest_handle.
+  ReturnCode ImportCertificate(const u8* cert, Handle signer_handle, Handle dest_handle, u32 pid);
 
   // Ownership
   ReturnCode GetOwnership(Handle handle, u32* owner) const;