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Use is_*_bad instead of is_*_ok.

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This commit is contained in:
levlam 2021-07-11 02:13:04 +03:00
parent ca61c97c13
commit 46aa876259
1 changed files with 8 additions and 9 deletions
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17
td/mtproto/Transport.cpp
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@ -253,25 +253,24 @@ Status Transport::read_crypto_impl(int X, MutableSlice message, const AuthKey &a
auto *prefix = reinterpret_cast<PrefixT *>(header->data);
*prefix_ptr = prefix;
size_t data_size = prefix->message_data_length + sizeof(PrefixT);
bool is_length_ok = true;
bool is_length_bad = false;
UInt128 real_message_key;
if (info->version == 1) {
is_length_ok &= !info->check_mod4 || prefix->message_data_length % 4 == 0;
is_length_bad |= info->check_mod4 && prefix->message_data_length % 4 != 0;
auto expected_size = calc_crypto_size<HeaderT>(data_size);
is_length_ok = (is_length_ok & (expected_size == message.size())) != 0;
auto check_size = data_size * is_length_ok + tail_size * (1 - is_length_ok);
is_length_bad |= expected_size != message.size();
auto check_size = data_size * (1 - is_length_bad) + tail_size * is_length_bad;
std::tie(info->message_ack, real_message_key) = calc_message_ack_and_key(*header, check_size);
} else {
std::tie(info->message_ack, real_message_key) = calc_message_key2(auth_key, X, to_decrypt);
}
bool is_key_ok = true;
int is_key_bad = false;
for (size_t i = 0; i < sizeof(real_message_key.raw); i++) {
is_key_ok &= real_message_key.raw[i] == header->message_key.raw[i];
is_key_bad |= real_message_key.raw[i] ^ header->message_key.raw[i];
}
if (!is_key_ok) {
if (is_key_bad != 0) {
return Status::Error(PSLICE() << "Invalid MTProto message: message_key mismatch [found = "
<< format::as_hex_dump(header->message_key)
<< "] [expected = " << format::as_hex_dump(real_message_key) << "]");
@ -295,7 +294,7 @@ Status Transport::read_crypto_impl(int X, MutableSlice message, const AuthKey &a
<< tag("message_data_length", prefix->message_data_length));
}
} else {
if (!is_length_ok) {
if (is_length_bad) {
return Status::Error(PSLICE() << "Invalid MTProto message: invalid length " << tag("total_size", message.size())
<< tag("message_data_length", prefix->message_data_length));
}