8#include <botan/roughtime.h>
10#include <botan/base64.h>
11#include <botan/hash.h>
12#include <botan/pubkey.h>
14#include <botan/internal/socket_udp.h>
28struct is_array : std::false_type {};
30template <
class T, std::
size_t N>
31struct is_array<std::array<T, N>> : std::true_type {};
34T impl_from_little_endian(
const uint8_t* t,
const size_t i)
35 requires(
sizeof(
T) <=
sizeof(int64_t))
37 return T(
static_cast<int64_t
>(t[i]) << i * 8) + (i == 0 ?
T(0) : impl_from_little_endian<
T>(t, i - 1));
41T from_little_endian(
const uint8_t* t) {
42 return impl_from_little_endian<T>(t,
sizeof(
T) - 1);
45template <typename T, std::enable_if_t<is_array<T>::value>* =
nullptr>
46T copy(
const uint8_t* t) {
47 return typecast_copy<T>(t);
50template <typename T, std::enable_if_t<!is_array<T>::value>* =
nullptr>
51T copy(
const uint8_t* t) {
52 return from_little_endian<T>(
57std::map<std::string, std::vector<uint8_t>> unpack_roughtime_packet(
T bytes) {
58 if(bytes.size() < 8) {
59 throw Roughtime::Roughtime_Error(
"Map length is under minimum of 8 bytes");
61 const auto buf = bytes.data();
62 const uint32_t num_tags = buf[0];
63 const uint32_t start_content = num_tags * 8;
64 if(start_content > bytes.size()) {
65 throw Roughtime::Roughtime_Error(
"Map length too small to contain all tags");
67 uint32_t start = start_content;
68 std::map<std::string, std::vector<uint8_t>> tags;
69 for(uint32_t i = 0; i < num_tags; ++i) {
71 ((i + 1) == num_tags) ? bytes.size() : start_content + from_little_endian<uint32_t>(buf + 4 + i * 4);
72 if(end > bytes.size()) {
73 throw Roughtime::Roughtime_Error(
"Tag end index out of bounds");
76 throw Roughtime::Roughtime_Error(
"Tag offset must be more than previous tag offset");
79 const char label[] = {label_ptr[0], label_ptr[1], label_ptr[2], label_ptr[3], 0};
80 auto ret = tags.emplace(label, std::vector<uint8_t>(buf + start, buf + end));
82 throw Roughtime::Roughtime_Error(std::string(
"Map has duplicated tag: ") + label);
84 start =
static_cast<uint32_t
>(end);
90T get(
const std::map<std::string, std::vector<uint8_t>>& map,
const std::string& label) {
91 const auto& tag = map.find(label);
92 if(tag == map.end()) {
93 throw Roughtime::Roughtime_Error(
"Tag " + label +
" not found");
95 if(tag->second.size() !=
sizeof(
T)) {
96 throw Roughtime::Roughtime_Error(
"Tag " + label +
" has unexpected size");
98 return copy<T>(tag->second.data());
101const std::vector<uint8_t>& get_v(
const std::map<std::string, std::vector<uint8_t>>& map,
const std::string& label) {
102 const auto& tag = map.find(label);
103 if(tag == map.end()) {
104 throw Roughtime::Roughtime_Error(
"Tag " + label +
" not found");
110 const std::vector<uint8_t>& payload,
111 const std::array<uint8_t, 64>& signature) {
112 const char context[] =
"RoughTime v1 response signature";
113 Ed25519_PublicKey key(std::vector<uint8_t>(pk.data(), pk.data() + pk.size()));
114 PK_Verifier verifier(key,
"Pure");
116 verifier.update(payload);
117 return verifier.check_signature(signature.data(), signature.size());
120std::array<uint8_t, 64> hashLeaf(
const std::array<uint8_t, 64>& leaf) {
121 std::array<uint8_t, 64> ret{};
124 hash->update(leaf.data(), leaf.size());
125 hash->final(ret.data());
129void hashNode(std::array<uint8_t, 64>& hash,
const std::array<uint8_t, 64>& node,
bool reverse) {
133 h->update(node.data(), node.size());
134 h->update(hash.data(), hash.size());
136 h->update(hash.data(), hash.size());
137 h->update(node.data(), node.size());
139 h->final(hash.data());
142template <
size_t N,
typename T>
143std::array<uint8_t, N> vector_to_array(std::vector<uint8_t, T> vec) {
144 if(vec.size() != N) {
145 throw std::logic_error(
"Invalid vector size");
147 return typecast_copy<std::array<uint8_t, N>>(vec.data());
154 if(nonce.size() != 64) {
157 m_nonce = typecast_copy<std::array<uint8_t, 64>>(nonce.data());
161 rng.
randomize(m_nonce.data(), m_nonce.size());
165 std::array<uint8_t, request_min_size> buf = {{2, 0, 0, 0, 64, 0, 0, 0,
'N',
'O',
'N',
'C',
'P',
'A',
'D', 0xff}};
167 std::memset(buf.data() + 16 + nonce.
get_nonce().size(), 0, buf.size() - 16 - nonce.
get_nonce().size());
172 const auto response_v = unpack_roughtime_packet(response);
173 const auto cert = unpack_roughtime_packet(get_v(response_v,
"CERT"));
174 const auto cert_dele = get<std::array<uint8_t, 72>>(cert,
"DELE");
175 const auto cert_sig = get<std::array<uint8_t, 64>>(cert,
"SIG");
176 const auto cert_dele_v = unpack_roughtime_packet(cert_dele);
177 const auto srep = get_v(response_v,
"SREP");
178 const auto srep_v = unpack_roughtime_packet(srep);
180 const auto cert_dele_pubk = get<std::array<uint8_t, 32>>(cert_dele_v,
"PUBK");
181 const auto sig = get<std::array<uint8_t, 64>>(response_v,
"SIG");
186 const auto indx = get<uint32_t>(response_v,
"INDX");
187 const auto path = get_v(response_v,
"PATH");
188 const auto srep_root = get<std::array<uint8_t, 64>>(srep_v,
"ROOT");
189 const size_t size = path.size();
190 const size_t levels = size / 64;
193 throw Roughtime_Error(
"Merkle tree path size must be multiple of 64 bytes");
195 if(indx >= (1U << levels)) {
202 while(level < levels) {
203 hashNode(hash,
typecast_copy<std::array<uint8_t, 64>>(path.data() + level * 64), index & 1);
208 if(srep_root != hash) {
212 const auto cert_dele_maxt =
sys_microseconds64(get<microseconds64>(cert_dele_v,
"MAXT"));
213 const auto cert_dele_mint =
sys_microseconds64(get<microseconds64>(cert_dele_v,
"MINT"));
215 const auto srep_radi = get<microseconds32>(srep_v,
"RADI");
216 if(srep_midp < cert_dele_mint) {
219 if(srep_midp > cert_dele_maxt) {
222 return {cert_dele, cert_sig, srep_midp, srep_radi};
226 const char context[] =
"RoughTime v1 delegation signature--";
229 verifier.
update(m_cert_dele.data(), m_cert_dele.size());
234 std::array<uint8_t, 64> ret{};
235 const auto blind_arr = blind.
get_nonce();
237 hash->update(previous_response);
238 hash->update(hash->final());
239 hash->update(blind_arr.data(), blind_arr.size());
240 hash->final(ret.data());
246 std::istringstream ss{std::string(str)};
247 const std::string ERROR_MESSAGE =
"Line does not have 4 space separated fields";
248 for(std::string s; std::getline(ss, s);) {
249 size_t start = 0, end = 0;
250 end = s.find(
' ', start);
251 if(end == std::string::npos) {
254 const auto publicKeyType = s.substr(start, end - start);
255 if(publicKeyType !=
"ed25519") {
260 end = s.find(
' ', start);
261 if(end == std::string::npos) {
267 end = s.find(
' ', start);
268 if(end == std::string::npos) {
271 if((end - start) != 88) {
274 const auto vec =
base64_decode(s.substr(start, end - start));
275 const auto nonceOrBlind =
Nonce(vector_to_array<64>(
base64_decode(s.substr(start, end - start))));
278 end = s.find(
' ', start);
279 if(end != std::string::npos) {
284 m_links.push_back({response, serverPublicKey, nonceOrBlind});
290 for(
unsigned i = 0; i < m_links.size(); ++i) {
291 const auto& l = m_links[i];
292 const auto nonce = i ?
nonce_from_blind(m_links[i - 1].response(), l.nonce_or_blind()) : l.nonce_or_blind();
294 if(!response.validate(l.public_key())) {
303 return m_links.empty() ? blind :
nonce_from_blind(m_links.back().response(), blind);
307 if(max_chain_size <= 0) {
311 while(m_links.size() >= max_chain_size) {
312 if(m_links.size() == 1) {
313 auto new_link_updated = new_link;
317 m_links.push_back(new_link_updated);
320 if(m_links.size() >= 2) {
321 m_links[1].nonce_or_blind() =
324 m_links.erase(m_links.begin());
326 m_links.push_back(new_link);
331 s.reserve((7 + 1 + 88 + 1 + 44 + 1 + 480) * m_links.size());
332 for(
const auto& link : m_links) {
337 s +=
base64_encode(link.nonce_or_blind().get_nonce().data(), link.nonce_or_blind().get_nonce().size());
345std::vector<uint8_t>
online_request(std::string_view uri,
const Nonce& nonce, std::chrono::milliseconds timeout) {
346 const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();
353 socket->write(encoded.data(), encoded.size());
355 if(std::chrono::system_clock::now() - start_time > timeout) {
359 std::vector<uint8_t> buffer;
360 buffer.resize(360 + 64 * 10 + 1);
362 const auto n = socket->read(buffer.data(), buffer.size());
364 if(!n || std::chrono::system_clock::now() - start_time > timeout) {
368 if(n == buffer.size()) {
377 std::vector<Server_Information> servers;
378 std::istringstream ss{std::string(str)};
380 const std::string ERROR_MESSAGE =
"Line does not have at least 5 space separated fields";
381 for(std::string s; std::getline(ss, s);) {
382 size_t start = 0, end = 0;
383 end = s.find(
' ', start);
384 if(end == std::string::npos) {
387 const auto name = s.substr(start, end - start);
390 end = s.find(
' ', start);
391 if(end == std::string::npos) {
394 const auto publicKeyType = s.substr(start, end - start);
395 if(publicKeyType !=
"ed25519") {
400 end = s.find(
' ', start);
402 if(end == std::string::npos) {
405 const auto publicKeyBase64 = s.substr(start, end - start);
409 end = s.find(
' ', start);
410 if(end == std::string::npos) {
413 const auto protocol = s.substr(start, end - start);
414 if(protocol !=
"udp") {
418 const auto addresses = [&]() {
419 std::vector<std::string> addr;
422 end = s.find(
' ', start);
423 const auto address = s.substr(start, (end == std::string::npos) ? std::string::npos : end - start);
424 if(address.empty()) {
427 addr.push_back(address);
428 if(end == std::string::npos) {
433 if(addresses.empty()) {
437 servers.push_back({
name, publicKey, addresses});
static std::unique_ptr< HashFunction > create_or_throw(std::string_view algo_spec, std::string_view provider="")
bool check_signature(const uint8_t sig[], size_t length)
void randomize(std::span< uint8_t > output)
void append(const Link &new_link, size_t max_chain_size)
std::string to_string() const
Nonce next_nonce(const Nonce &blind) const
std::vector< Response > responses() const
const Nonce & nonce_or_blind() const
const std::array< uint8_t, 64 > & get_nonce() const
std::chrono::time_point< std::chrono::system_clock, microseconds64 > sys_microseconds64
static Response from_bits(const std::vector< uint8_t > &response, const Nonce &nonce)
bool validate(const Ed25519_PublicKey &pk) const
std::unique_ptr< SocketUDP > BOTAN_TEST_API open_socket_udp(std::string_view hostname, std::string_view service, std::chrono::microseconds timeout)
std::vector< Server_Information > servers_from_str(std::string_view str)
std::vector< uint8_t > online_request(std::string_view uri, const Nonce &nonce, std::chrono::milliseconds timeout)
Nonce nonce_from_blind(const std::vector< uint8_t > &previous_response, const Nonce &blind)
std::array< uint8_t, request_min_size > encode_request(const Nonce &nonce)
const unsigned request_min_size
bool verify_signature(std::span< const uint8_t, ED448_LEN > pk, bool phflag, std::span< const uint8_t > context, std::span< const uint8_t > sig, std::span< const uint8_t > msg)
Verify a signature(RFC 8032 5.2.7)
constexpr void typecast_copy(ToR &&out, FromR &&in)
size_t base64_encode(char out[], const uint8_t in[], size_t input_length, size_t &input_consumed, bool final_inputs)
size_t base64_decode(uint8_t out[], const char in[], size_t input_length, size_t &input_consumed, bool final_inputs, bool ignore_ws)
std::vector< T > unlock(const secure_vector< T > &in)
const char * cast_uint8_ptr_to_char(const uint8_t *b)
const uint8_t * cast_char_ptr_to_uint8(const char *s)