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MediaDrm throws an exception when Secure Stops are requested

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Our recommendation to OEMs is that they support a table of at least 50
usage entries in OEMCrypto. If more usage entries are stored, the PSTs get
added to the CDM but are LRU'ed out of the OEMCrypto usage table. When the
CDM queries those usage entries, OEMCrypto will return a
OEMCrypto_ERROR_INVALID_CONTEXT. Rather than return an error and have
MediaDrm throw an exception, CDM should delete this PST and return the
next usage entry, when queried.

[ Merge of https://widevine-internal-review.googlesource.com/#/c/11457/
  from Widevine cdm repo ]

b/17994711

Change-Id: I00e3f93000096fb434d94333e22958de795a4bb5
This commit is contained in:
Rahul Frias
2014-11-13 11:51:05 -08:00
parent 3b1a3e47d8
commit aa7ad630d7
9 changed files with 211 additions and 47 deletions
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41
libwvdrmengine/cdm/core/src/license.cpp
View File

@@ -476,20 +476,21 @@ bool CdmLicense::PrepareKeyRequest(const InitializationData& init_data,
return true;
}
bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
CdmKeyMessage* signed_request,
std::string* server_url) {
CdmResponseType CdmLicense::PrepareKeyUpdateRequest(
bool is_renewal,
CdmKeyMessage* signed_request,
std::string* server_url) {
if (!initialized_) {
LOGE("CdmLicense::PrepareKeyUpdateRequest: not initialized");
return false;
return UNKNOWN_ERROR;
}
if (!signed_request) {
LOGE("CdmLicense::PrepareKeyUpdateRequest: No signed request provided");
return false;
return UNKNOWN_ERROR;
}
if (!server_url) {
LOGE("CdmLicense::PrepareKeyUpdateRequest: No server url provided");
return false;
return UNKNOWN_ERROR;
}
LicenseRequest license_request;
@@ -513,7 +514,7 @@ bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
CdmResponseType status =
session_->DeactivateUsageInformation(provider_session_token_);
if (NO_ERROR != status)
return false;
return status;
}
std::string usage_report;
@@ -526,7 +527,7 @@ bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
if (NO_ERROR == status)
current_license->set_session_usage_table_entry(usage_report);
else
return false;
return KEY_ERROR;
}
}
@@ -545,7 +546,7 @@ bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
// of the license response.
uint32_t nonce;
if (!session_->GenerateNonce(&nonce)) {
return false;
return KEY_ERROR;
}
license_request.set_key_control_nonce(nonce);
LOGD("PrepareKeyUpdateRequest: nonce=%u", nonce);
@@ -559,13 +560,13 @@ bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
std::string license_request_signature;
if (!session_->PrepareRenewalRequest(serialized_license_req,
&license_request_signature))
return false;
return KEY_ERROR;
if (license_request_signature.empty()) {
LOGE(
"CdmLicense::PrepareKeyUpdateRequest: empty license request"
" signature");
return false;
return KEY_ERROR;
}
// Put serialize license request and signature together
@@ -576,7 +577,7 @@ bool CdmLicense::PrepareKeyUpdateRequest(bool is_renewal,
signed_message.SerializeToString(signed_request);
*server_url = server_url_;
return true;
return KEY_MESSAGE;
}
CdmResponseType CdmLicense::HandleKeyResponse(
@@ -636,16 +637,16 @@ CdmResponseType CdmLicense::HandleKeyResponse(
// Extract mac key
std::string mac_key_iv;
std::string mac_key;
if (license.policy().can_renew()) {
for (int i = 0; i < license.key_size(); ++i) {
if (license.key(i).type() == License_KeyContainer::SIGNING) {
mac_key_iv.assign(license.key(i).iv());
for (int i = 0; i < license.key_size(); ++i) {
if (license.key(i).type() == License_KeyContainer::SIGNING) {
mac_key_iv.assign(license.key(i).iv());
// Strip off PKCS#5 padding
mac_key.assign(license.key(i).key().data(), MAC_KEY_SIZE);
}
// Strip off PKCS#5 padding
mac_key.assign(license.key(i).key().data(), MAC_KEY_SIZE);
}
}
if (license.policy().can_renew() ||
(mac_key_iv.size() != 0 || mac_key.size() != 0)) {
if (mac_key_iv.size() != KEY_IV_SIZE || mac_key.size() != MAC_KEY_SIZE) {
LOGE(
"CdmLicense::HandleKeyResponse: mac key/iv size error"