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Add License::Policy::play_start_grace_period_seconds

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[ Merge of http://go/wvgerrit/22565 ]

When using the grace period, the CDM will need to override the values
given to use by the TEE (through OEMCrypto).  Normally the first (and
last) decrypt times are stored securely by the TEE.  To avoid extra
complexity in OEMCrypto, we will simply ignore the values given to us
by the TEE when using this feature.

However, the TEE will still enforce the (hard) license duration.  So
only the rental/playback durations will be affected by malicious
editing of files.

b/34211676

Test: Reran unittests including newly added tests. All tests other than
some oemcrypto, request_license_test passed. Those tests failed with
or without this CL.

Change-Id: I6d7b5bfb669fd8603b474b68c2f7175b0c30901d
This commit is contained in:
Rahul Frias
2017-01-16 18:17:01 -08:00
parent b492f7b73b
commit 826c91ba26
10 changed files with 252 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
libwvdrmengine/cdm/core/src/cdm_session.cpp
View File

@@ -129,12 +129,14 @@ CdmResponseType CdmSession::RestoreOfflineSession(
DeviceFiles::LicenseState license_state;
int64_t playback_start_time;
int64_t last_playback_time;
int64_t grace_period_end_time;
if (!file_handle_->RetrieveLicense(
key_set_id, &license_state, &offline_init_data_, &key_request_,
&key_response_, &offline_key_renewal_request_,
&offline_key_renewal_response_, &offline_release_server_url_,
&playback_start_time, &last_playback_time, &app_parameters_)) {
&playback_start_time, &last_playback_time, &grace_period_end_time,
&app_parameters_)) {
LOGE("CdmSession::Init failed to retrieve license. key set id = %s",
key_set_id.c_str());
return GET_LICENSE_ERROR;
@@ -156,7 +158,7 @@ CdmResponseType CdmSession::RestoreOfflineSession(
} else {
if (!license_parser_->RestoreOfflineLicense(
key_request_, key_response_, offline_key_renewal_response_,
playback_start_time, last_playback_time)) {
playback_start_time, last_playback_time, grace_period_end_time)) {
return RESTORE_OFFLINE_LICENSE_ERROR_2;
}
}
@@ -568,7 +570,8 @@ bool CdmSession::StoreLicense(DeviceFiles::LicenseState state) {
key_set_id_, state, offline_init_data_, key_request_, key_response_,
offline_key_renewal_request_, offline_key_renewal_response_,
offline_release_server_url_, policy_engine_->GetPlaybackStartTime(),
policy_engine_->GetLastPlaybackTime(), app_parameters_);
policy_engine_->GetLastPlaybackTime(),
policy_engine_->GetGracePeriodEndTime(), app_parameters_);
}
CdmResponseType CdmSession::ReleaseCrypto() {