Commit 5ad92910 authored by Mark Haines's avatar Mark Haines
Browse files

Version the pickled objects and check for errors when unpickling them

parent b6e248c9
......@@ -27,6 +27,8 @@ enum struct ErrorCode {
BAD_MESSAGE_KEY_ID = 6, /*!< The message references an unknown key id */
INVALID_BASE64 = 7, /*!< The input base64 was invalid */
BAD_ACCOUNT_KEY = 8, /*!< The supplied account key is invalid */
UNKNOWN_PICKLE_VERSION = 9, /*!< The pickled object is too new */
CORRUPTED_PICKLE = 10, /*!< The pickled object couldn't be decoded */
};
} // namespace olm
......
......@@ -360,11 +360,16 @@ static std::uint8_t const * unpickle(
} // namespace olm
namespace {
static const std::uint32_t ACCOUNT_PICKLE_VERSION = 1;
}
std::size_t olm::pickle_length(
olm::Account const & value
) {
std::size_t length = 0;
length += olm::pickle_length(ACCOUNT_PICKLE_VERSION);
length += olm::pickle_length(value.identity_keys);
length += olm::pickle_length(value.one_time_keys);
length += olm::pickle_length(value.next_one_time_key_id);
......@@ -376,6 +381,7 @@ std::uint8_t * olm::pickle(
std::uint8_t * pos,
olm::Account const & value
) {
pos = olm::pickle(pos, ACCOUNT_PICKLE_VERSION);
pos = olm::pickle(pos, value.identity_keys);
pos = olm::pickle(pos, value.one_time_keys);
pos = olm::pickle(pos, value.next_one_time_key_id);
......@@ -387,6 +393,12 @@ std::uint8_t const * olm::unpickle(
std::uint8_t const * pos, std::uint8_t const * end,
olm::Account & value
) {
uint32_t pickle_version;
pos = olm::unpickle(pos, end, pickle_version);
if (pickle_version != ACCOUNT_PICKLE_VERSION) {
value.last_error = olm::ErrorCode::UNKNOWN_PICKLE_VERSION;
return end;
}
pos = olm::unpickle(pos, end, value.identity_keys);
pos = olm::unpickle(pos, end, value.one_time_keys);
pos = olm::unpickle(pos, end, value.next_one_time_key_id);
......
......@@ -151,7 +151,7 @@ std::size_t b64_input(
return raw_length;
}
const char * errors[9] {
const char * errors[11] {
"SUCCESS",
"NOT_ENOUGH_RANDOM",
"OUTPUT_BUFFER_TOO_SMALL",
......@@ -161,6 +161,8 @@ const char * errors[9] {
"BAD_MESSAGE_KEY_ID",
"INVALID_BASE64",
"BAD_ACCOUNT_KEY",
"UNKNOWN_PICKLE_VERSION",
"CORRUPTED_PICKLE",
};
} // namespace
......@@ -282,7 +284,16 @@ size_t olm_unpickle_account(
return std::size_t(-1);
}
std::uint8_t * const end = pos + raw_length;
unpickle(pos, end, object);
/* On success unpickle will return (pos + raw_length). If unpickling
* terminates too soon then it will return a pointer before
* (pos + raw_length). On error unpickle will return (pos + raw_length + 1).
*/
if (end != unpickle(pos, end + 1, object)) {
if (object.last_error == olm::ErrorCode::SUCCESS) {
object.last_error = olm::ErrorCode::CORRUPTED_PICKLE;
}
return std::size_t(-1);
}
return pickled_length;
}
......@@ -300,8 +311,18 @@ size_t olm_unpickle_session(
if (raw_length == std::size_t(-1)) {
return std::size_t(-1);
}
std::uint8_t * const end = pos + raw_length;
unpickle(pos, end, object);
std::uint8_t * const end = pos + raw_length + 1;
/* On success unpickle will return (pos + raw_length). If unpickling
* terminates too soon then it will return a pointer before
* (pos + raw_length). On error unpickle will return (pos + raw_length + 1).
*/
if (end != unpickle(pos, end + 1, object)) {
if (object.last_error == olm::ErrorCode::SUCCESS) {
object.last_error = olm::ErrorCode::CORRUPTED_PICKLE;
}
return std::size_t(-1);
}
return pickled_length;
}
......
......@@ -353,11 +353,15 @@ std::size_t olm::Session::decrypt(
return result;
}
namespace {
static const std::uint32_t SESSION_PICKLE_VERSION = 1;
}
std::size_t olm::pickle_length(
Session const & value
) {
std::size_t length = 0;
length += olm::pickle_length(SESSION_PICKLE_VERSION);
length += olm::pickle_length(value.received_message);
length += olm::pickle_length(value.alice_identity_key);
length += olm::pickle_length(value.alice_base_key);
......@@ -371,6 +375,7 @@ std::uint8_t * olm::pickle(
std::uint8_t * pos,
Session const & value
) {
pos = olm::pickle(pos, SESSION_PICKLE_VERSION);
pos = olm::pickle(pos, value.received_message);
pos = olm::pickle(pos, value.alice_identity_key);
pos = olm::pickle(pos, value.alice_base_key);
......@@ -384,6 +389,12 @@ std::uint8_t const * olm::unpickle(
std::uint8_t const * pos, std::uint8_t const * end,
Session & value
) {
uint32_t pickle_version;
pos = olm::unpickle(pos, end, pickle_version);
if (pickle_version != SESSION_PICKLE_VERSION) {
value.last_error = olm::ErrorCode::UNKNOWN_PICKLE_VERSION;
return end;
}
pos = olm::unpickle(pos, end, value.received_message);
pos = olm::unpickle(pos, end, value.alice_identity_key);
pos = olm::unpickle(pos, end, value.alice_base_key);
......
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