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Add workaround for VERSION_2_2 back compat

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Uses the same workaround as whitebox for compatibility with v16.4 and older servers.

Test: Locally built in Trusty repo, installed on prod device with DPM, ran custom Exoplayer demo with license server URL replaced with 1642 endpoint.
PiperOrigin-RevId: 639882556
Merged from https://widevine-internal-review.googlesource.com/199870

Change-Id: I1669acc3ddae1bb3726bacd0de2f72aca75c9e97
(cherry picked from commit 5f7cd33f9869825bb17992840483807cae83ad24)
This commit is contained in:
Matt Feddersen
2024-06-03 12:55:26 -07:00
committed by Vicky Min
parent d7eab65c8c
commit 17d28c35fa
1 changed files with 32 additions and 0 deletions
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32
libwvdrmengine/oemcrypto/odk/src/odk_serialize.c
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@@ -8,6 +8,8 @@
#include "odk_serialize.h"
#include "odk_message.h"
#include "odk_overflow.h"
#include "odk_structs_priv.h"
#include "serialization_base.h"
@@ -237,6 +239,36 @@ static void Unpack_OEMCrypto_KeyObject(ODK_Message* msg,
Unpack_OEMCrypto_Substring(msg, &obj->key_data);
Unpack_OEMCrypto_Substring(msg, &obj->key_control_iv);
Unpack_OEMCrypto_Substring(msg, &obj->key_control);
/*
Edge case for servers that incorrectly process protocol VERSION_2_2 padding.
Key data in proto is present, but each key's position in the core
message is missing.
Use the key_data_iv offset to determine if the key_data is present.
This assumes that the serialized protobuf is deterministically ordered, and
that the content key is always 16 bytes. These assumptions should hold true
for v16 and older servers.
*/
if (ODK_Message_GetStatus(msg) == MESSAGE_STATUS_OK &&
obj->key_data.offset == 0 && obj->key_data.length == 0) {
const size_t kKeyDataProtoHeaderSize = 2;
obj->key_data.offset = obj->key_data_iv.offset + obj->key_data_iv.length +
kKeyDataProtoHeaderSize;
obj->key_data.length = 16u; // assume 16-byte key
// Check for overflow. The offset is relative to the end of the core
// message, so add that length to the calculation.
size_t substring_end = 0; // offset + length
size_t end = 0; // offset + length + message_length
if (odk_add_overflow_ux(obj->key_data.offset, obj->key_data.length,
&substring_end) ||
odk_add_overflow_ux(substring_end, ODK_Message_GetSize(msg), &end) ||
end > ODK_Message_GetCapacity(msg)) {
ODK_Message_SetStatus(msg, MESSAGE_STATUS_OVERFLOW_ERROR);
return;
}
}
}
static void Unpack_ODK_TimerLimits(ODK_Message* msg, ODK_TimerLimits* obj) {