8#include <botan/roughtime.h>
10#include <botan/base64.h>
11#include <botan/hash.h>
12#include <botan/internal/socket_udp.h>
13#include <botan/pubkey.h>
27template<
bool B,
class T =
void >
31struct is_array : std::false_type {};
33template<
class T, std::
size_t N>
34struct is_array<
std::array<T,N>>:std::true_type{};
37T impl_from_little_endian(
const uint8_t* t,
const size_t i)
39 static_assert(
sizeof(
T) <=
sizeof(int64_t),
"");
40 return T(
static_cast<int64_t
>(t[i]) << i * 8) + (i == 0 ?
T(0) : impl_from_little_endian<
T>(t, i - 1));
44T from_little_endian(
const uint8_t* t)
46 return impl_from_little_endian<T>(t,
sizeof(
T) - 1);
49template<typename T, enable_if_t<is_array<T>::value>* =
nullptr>
50T copy(
const uint8_t* t)
52 return typecast_copy<T>(t);
55template<typename T, enable_if_t<!is_array<T>::value>* =
nullptr>
56T copy(
const uint8_t* t)
58 return from_little_endian<T>(t);
62std::map<std::string, std::vector<uint8_t>> unpack_roughtime_packet(
T bytes)
65 {
throw Roughtime::Roughtime_Error(
"Map length is under minimum of 8 bytes"); }
66 const auto buf = bytes.data();
67 const uint32_t num_tags = buf[0];
68 const uint32_t start_content = num_tags * 8;
69 if(start_content > bytes.size())
70 {
throw Roughtime::Roughtime_Error(
"Map length too small to contain all tags"); }
71 uint32_t start = start_content;
72 std::map<std::string, std::vector<uint8_t>> tags;
73 for(uint32_t i=0; i<num_tags; ++i)
75 const size_t end = ((i+1) == num_tags) ? bytes.size() : start_content + from_little_endian<uint32_t>(buf + 4 + i*4);
76 if(end > bytes.size())
77 {
throw Roughtime::Roughtime_Error(
"Tag end index out of bounds"); }
79 {
throw Roughtime::Roughtime_Error(
"Tag offset must be more than previous tag offset"); }
81 const char label[] = {label_ptr[0], label_ptr[1], label_ptr[2], label_ptr[3], 0};
82 auto ret = tags.emplace(label, std::vector<uint8_t>(buf+start, buf+end));
84 {
throw Roughtime::Roughtime_Error(std::string(
"Map has duplicated tag: ") + label); }
85 start =
static_cast<uint32_t
>(end);
91T get(
const std::map<std::string, std::vector<uint8_t>>& map,
const std::string& label)
93 const auto& tag = map.find(label);
95 {
throw Roughtime::Roughtime_Error(
"Tag " + label +
" not found"); }
96 if(tag->second.size() !=
sizeof(
T))
97 {
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)
103 const auto& tag = map.find(label);
105 {
throw Roughtime::Roughtime_Error(
"Tag " + label +
" not found"); }
109bool verify_signature(
const std::array<uint8_t, 32>& pk,
const std::vector<uint8_t>& payload,
110 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)
122 std::array<uint8_t, 64> ret;
125 hash->update(leaf.data(), leaf.size());
126 hash->final(ret.data());
130void hashNode(std::array<uint8_t, 64>&
hash,
const std::array<uint8_t, 64>& node,
bool reverse)
136 h->update(node.data(), node.size());
137 h->update(
hash.data(),
hash.size());
141 h->update(
hash.data(),
hash.size());
142 h->update(node.data(), node.size());
144 h->final(
hash.data());
147template<
size_t N,
typename T>
148std::array<uint8_t, N> vector_to_array(std::vector<uint8_t,T> vec)
151 {
throw std::logic_error(
"Invalid vector size"); }
152 return typecast_copy<std::array<uint8_t, N>>(vec.data());
160 if(nonce.size() != 64)
162 m_nonce = typecast_copy<std::array<uint8_t, 64>>(nonce.data());
166 rng.
randomize(m_nonce.data(), m_nonce.size());
171 std::array<uint8_t, request_min_size> buf = {{2, 0, 0, 0, 64, 0, 0, 0,
'N',
'O',
'N',
'C',
'P',
'A',
'D', 0xff}};
173 std::memset(buf.data() + 16 + nonce.
get_nonce().size(), 0, buf.size() - 16 - nonce.
get_nonce().size());
180 const auto response_v = unpack_roughtime_packet(response);
181 const auto cert = unpack_roughtime_packet(get_v(response_v,
"CERT"));
182 const auto cert_dele = get<std::array<uint8_t, 72>>(cert,
"DELE");
183 const auto cert_sig = get<std::array<uint8_t, 64>>(cert,
"SIG");
184 const auto cert_dele_v = unpack_roughtime_packet(cert_dele);
185 const auto srep = get_v(response_v,
"SREP");
186 const auto srep_v = unpack_roughtime_packet(srep);
188 const auto cert_dele_pubk = get<std::array<uint8_t, 32>>(cert_dele_v,
"PUBK");
189 const auto sig = get<std::array<uint8_t, 64>>(response_v,
"SIG");
190 if(!verify_signature(cert_dele_pubk, srep, sig))
193 const auto indx = get<uint32_t>(response_v,
"INDX");
194 const auto path = get_v(response_v,
"PATH");
195 const auto srep_root = get<std::array<uint8_t, 64>>(srep_v,
"ROOT");
196 const auto size = path.size();
197 const auto levels = size/64;
200 {
throw Roughtime_Error(
"Merkle tree path size must be multiple of 64 bytes"); }
201 if(indx >= (1u << levels))
207 while(level < levels)
209 hashNode(
hash,
typecast_copy<std::array<uint8_t, 64>>(path.data() + level*64), index&1);
214 if(srep_root !=
hash)
217 const auto cert_dele_maxt =
sys_microseconds64(get<microseconds64>(cert_dele_v,
"MAXT"));
218 const auto cert_dele_mint =
sys_microseconds64(get<microseconds64>(cert_dele_v,
"MINT"));
220 const auto srep_radi = get<microseconds32>(srep_v,
"RADI");
221 if(srep_midp < cert_dele_mint)
223 if(srep_midp > cert_dele_maxt)
225 return {cert_dele, cert_sig, srep_midp, srep_radi};
230 const char context[] =
"RoughTime v1 delegation signature--";
233 verifier.
update(m_cert_dele.data(), m_cert_dele.size());
240 std::array<uint8_t, 64> ret;
241 const auto blind_arr = blind.
get_nonce();
243 hash->update(previous_response);
245 hash->update(blind_arr.data(), blind_arr.size());
246 hash->final(ret.data());
253 std::stringstream ss(str);
254 const std::string ERROR_MESSAGE =
"Line does not have 4 space separated fields";
255 for(std::string s; std::getline(ss, s);)
257 size_t start = 0, end = 0;
258 end = s.find(
' ', start);
259 if(end == std::string::npos)
263 const auto publicKeyType = s.substr(start, end-start);
264 if(publicKeyType !=
"ed25519")
265 {
throw Not_Implemented(
"Only ed25519 publicKeyType is implemented"); }
268 end = s.find(
' ', start);
269 if(end == std::string::npos)
276 end = s.find(
' ', start);
277 if(end == std::string::npos)
281 if((end - start) != 88)
289 end = s.find(
' ', start);
290 if(end != std::string::npos)
296 m_links.push_back({response, serverPublicKey, nonceOrBlind});
302 for(
unsigned i = 0; i < m_links.size(); ++i)
304 const auto& l = m_links[i];
305 const auto nonce = i ?
nonce_from_blind(m_links[i-1].response(), l.nonce_or_blind()) : l.nonce_or_blind();
307 if(!response.validate(l.public_key()))
315 return m_links.empty()
321 if(max_chain_size <= 0)
324 while(m_links.size() >= max_chain_size)
326 if(m_links.size() == 1)
328 auto new_link_updated = new_link;
332 m_links.push_back(new_link_updated);
335 if(m_links.size() >= 2)
337 m_links[1].nonce_or_blind() =
340 m_links.erase(m_links.begin());
342 m_links.push_back(new_link);
348 s.reserve((7+1 + 88+1 + 44+1 + 480)*m_links.size());
349 for(
const auto& link : m_links)
355 s +=
Botan::base64_encode(link.nonce_or_blind().get_nonce().data(), link.nonce_or_blind().get_nonce().size());
365 std::chrono::milliseconds timeout)
367 const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();
373 socket->write(encoded.data(), encoded.size());
375 if(std::chrono::system_clock::now() - start_time > timeout)
378 std::vector<uint8_t> buffer;
379 buffer.resize(360+64*10+1);
381 const auto n = socket->read(buffer.data(), buffer.size());
383 if(!n || std::chrono::system_clock::now() - start_time > timeout)
386 if(n == buffer.size())
395 std::vector<Server_Information> servers;
396 std::stringstream ss(str);
397 const std::string ERROR_MESSAGE =
"Line does not have at least 5 space separated fields";
398 for(std::string s; std::getline(ss, s);)
400 size_t start = 0, end = 0;
401 end = s.find(
' ', start);
402 if(end == std::string::npos)
406 const auto name = s.substr(start, end-start);
409 end = s.find(
' ', start);
410 if(end == std::string::npos)
414 const auto publicKeyType = s.substr(start, end-start);
415 if(publicKeyType !=
"ed25519")
416 {
throw Not_Implemented(
"Only ed25519 publicKeyType is implemented"); }
419 end = s.find(
' ', start);
421 if(end == std::string::npos)
425 const auto publicKeyBase64 = s.substr(start, end-start);
429 end = s.find(
' ', start);
430 if(end == std::string::npos)
434 const auto protocol = s.substr(start, end-start);
435 if(protocol !=
"udp")
438 const auto addresses = [&]()
440 std::vector<std::string> addr;
444 end = s.find(
' ', start);
445 const auto address = s.substr(start, (end == std::string::npos) ? std::string::npos : end-start);
448 addr.push_back(address);
449 if(end == std::string::npos)
454 if(addresses.size() == 0)
459 servers.push_back({
name, publicKey, std::move(addresses)});
static std::unique_ptr< HashFunction > create_or_throw(const std::string &algo_spec, const std::string &provider="")
bool check_signature(const uint8_t sig[], size_t length)
virtual void randomize(uint8_t output[], size_t length)=0
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(const std::string &hostname, const std::string &service, std::chrono::microseconds timeout)
std::vector< uint8_t > online_request(const std::string &uri, const Nonce &nonce, std::chrono::milliseconds timeout)
std::vector< Server_Information > servers_from_str(const std::string &str)
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
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)
void typecast_copy(uint8_t out[], T in[], size_t N)
const char * cast_uint8_ptr_to_char(const uint8_t *b)
const uint8_t * cast_char_ptr_to_uint8(const char *s)