5841327280

Committed 12 Aug 2023 12:33PM UTC coverage: 91.709% (-0.01%) from 91.719%

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Merge pull request #3668 from randombit/enable_if_t_cxx20

roughtime remove redefinition of enable_if_t helper

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/src/lib/misc/roughtime/roughtime.cpp

/*
* Roughtime
* (C) 2019 Nuno Goncalves <nunojpg@gmail.com>
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/roughtime.h>

#include <botan/base64.h>
#include <botan/hash.h>
#include <botan/pubkey.h>
#include <botan/rng.h>
#include <botan/internal/socket_udp.h>

#include <cmath>
#include <map>
#include <sstream>

namespace Botan {

namespace {

// This exists to work around a LGTM false positive
static_assert(Roughtime::request_min_size == 1024, "Expected minimum size");

template <class T>
struct is_array : std::false_type {};

template <class T, std::size_t N>
struct is_array<std::array<T, N>> : std::true_type {};

template <typename T>
T impl_from_little_endian(const uint8_t* t, const size_t i)
   requires(sizeof(T) <= sizeof(int64_t))
{
   return T(static_cast<int64_t>(t[i]) << i * 8) + (i == 0 ? T(0) : impl_from_little_endian<T>(t, i - 1));
}

template <typename T>
T from_little_endian(const uint8_t* t) {
   return impl_from_little_endian<T>(t, sizeof(T) - 1);
}

template <typename T, std::enable_if_t<is_array<T>::value>* = nullptr>
T copy(const uint8_t* t) {
   return typecast_copy<T>(t);  //arrays are endianess indepedent, so we do a memcpy
}

template <typename T, std::enable_if_t<!is_array<T>::value>* = nullptr>
T copy(const uint8_t* t) {
   return from_little_endian<T>(
      t);  //other types are arithmetic, so we account that roughtime serializes as little endian
}

template <typename T>
std::map<std::string, std::vector<uint8_t>> unpack_roughtime_packet(T bytes) {
   if(bytes.size() < 8) {
      throw Roughtime::Roughtime_Error("Map length is under minimum of 8 bytes");
   }
   const auto buf = bytes.data();
   const uint32_t num_tags = buf[0];
   const uint32_t start_content = num_tags * 8;
   if(start_content > bytes.size()) {
      throw Roughtime::Roughtime_Error("Map length too small to contain all tags");
   }
   uint32_t start = start_content;
   std::map<std::string, std::vector<uint8_t>> tags;
   for(uint32_t i = 0; i < num_tags; ++i) {
      const size_t end =
         ((i + 1) == num_tags) ? bytes.size() : start_content + from_little_endian<uint32_t>(buf + 4 + i * 4);
      if(end > bytes.size()) {
         throw Roughtime::Roughtime_Error("Tag end index out of bounds");
      }
      if(end < start) {
         throw Roughtime::Roughtime_Error("Tag offset must be more than previous tag offset");
      }
      const char* label_ptr = cast_uint8_ptr_to_char(buf) + (num_tags + i) * 4;
      const char label[] = {label_ptr[0], label_ptr[1], label_ptr[2], label_ptr[3], 0};
      auto ret = tags.emplace(label, std::vector<uint8_t>(buf + start, buf + end));
      if(!ret.second) {
         throw Roughtime::Roughtime_Error(std::string("Map has duplicated tag: ") + label);
      }
      start = static_cast<uint32_t>(end);
   }
   return tags;
}

template <typename T>
T get(const std::map<std::string, std::vector<uint8_t>>& map, const std::string& label) {
   const auto& tag = map.find(label);
   if(tag == map.end()) {
      throw Roughtime::Roughtime_Error("Tag " + label + " not found");
   }
   if(tag->second.size() != sizeof(T)) {
      throw Roughtime::Roughtime_Error("Tag " + label + " has unexpected size");
   }
   return copy<T>(tag->second.data());
}

const std::vector<uint8_t>& get_v(const std::map<std::string, std::vector<uint8_t>>& map, const std::string& label) {
   const auto& tag = map.find(label);
   if(tag == map.end()) {
      throw Roughtime::Roughtime_Error("Tag " + label + " not found");
   }
   return tag->second;
}

bool verify_signature(const std::array<uint8_t, 32>& pk,
                      const std::vector<uint8_t>& payload,
                      const std::array<uint8_t, 64>& signature) {
   const char context[] = "RoughTime v1 response signature";
   Ed25519_PublicKey key(std::vector<uint8_t>(pk.data(), pk.data() + pk.size()));
   PK_Verifier verifier(key, "Pure");
   verifier.update(cast_char_ptr_to_uint8(context), sizeof(context));  //add context including \0
   verifier.update(payload);
   return verifier.check_signature(signature.data(), signature.size());
}

std::array<uint8_t, 64> hashLeaf(const std::array<uint8_t, 64>& leaf) {
   std::array<uint8_t, 64> ret{};
   auto hash = HashFunction::create_or_throw("SHA-512");
   hash->update(0);
   hash->update(leaf.data(), leaf.size());
   hash->final(ret.data());
   return ret;
}

void hashNode(std::array<uint8_t, 64>& hash, const std::array<uint8_t, 64>& node, bool reverse) {
   auto h = HashFunction::create_or_throw("SHA-512");
   h->update(1);
   if(reverse) {
      h->update(node.data(), node.size());
      h->update(hash.data(), hash.size());
   } else {
      h->update(hash.data(), hash.size());
      h->update(node.data(), node.size());
   }
   h->final(hash.data());
}

template <size_t N, typename T>
std::array<uint8_t, N> vector_to_array(std::vector<uint8_t, T> vec) {
   if(vec.size() != N) {
      throw std::logic_error("Invalid vector size");
   }
   return typecast_copy<std::array<uint8_t, N>>(vec.data());
}
}  // namespace

namespace Roughtime {

Nonce::Nonce(const std::vector<uint8_t>& nonce) {
   if(nonce.size() != 64) {
      throw Invalid_Argument("Roughtime nonce must be 64 bytes long");
   }
   m_nonce = typecast_copy<std::array<uint8_t, 64>>(nonce.data());
}

Nonce::Nonce(RandomNumberGenerator& rng) {
   rng.randomize(m_nonce.data(), m_nonce.size());
}

std::array<uint8_t, request_min_size> encode_request(const Nonce& nonce) {
   std::array<uint8_t, request_min_size> buf = {{2, 0, 0, 0, 64, 0, 0, 0, 'N', 'O', 'N', 'C', 'P', 'A', 'D', 0xff}};
   std::memcpy(buf.data() + 16, nonce.get_nonce().data(), nonce.get_nonce().size());
   std::memset(buf.data() + 16 + nonce.get_nonce().size(), 0, buf.size() - 16 - nonce.get_nonce().size());
   return buf;
}

Response Response::from_bits(const std::vector<uint8_t>& response, const Nonce& nonce) {
   const auto response_v = unpack_roughtime_packet(response);
   const auto cert = unpack_roughtime_packet(get_v(response_v, "CERT"));
   const auto cert_dele = get<std::array<uint8_t, 72>>(cert, "DELE");
   const auto cert_sig = get<std::array<uint8_t, 64>>(cert, "SIG");
   const auto cert_dele_v = unpack_roughtime_packet(cert_dele);
   const auto srep = get_v(response_v, "SREP");
   const auto srep_v = unpack_roughtime_packet(srep);

   const auto cert_dele_pubk = get<std::array<uint8_t, 32>>(cert_dele_v, "PUBK");
   const auto sig = get<std::array<uint8_t, 64>>(response_v, "SIG");
   if(!verify_signature(cert_dele_pubk, srep, sig)) {
      throw Roughtime_Error("Response signature invalid");
   }

   const auto indx = get<uint32_t>(response_v, "INDX");
   const auto path = get_v(response_v, "PATH");
   const auto srep_root = get<std::array<uint8_t, 64>>(srep_v, "ROOT");
   const size_t size = path.size();
   const size_t levels = size / 64;

   if(size % 64) {
      throw Roughtime_Error("Merkle tree path size must be multiple of 64 bytes");
   }
   if(indx >= (1U << levels)) {
      throw Roughtime_Error("Merkle tree path is too short");
   }

   auto hash = hashLeaf(nonce.get_nonce());
   auto index = indx;
   size_t level = 0;
   while(level < levels) {
      hashNode(hash, typecast_copy<std::array<uint8_t, 64>>(path.data() + level * 64), index & 1);
      ++level;
      index >>= 1;
   }

   if(srep_root != hash) {
      throw Roughtime_Error("Nonce verification failed");
   }

   const auto cert_dele_maxt = sys_microseconds64(get<microseconds64>(cert_dele_v, "MAXT"));
   const auto cert_dele_mint = sys_microseconds64(get<microseconds64>(cert_dele_v, "MINT"));
   const auto srep_midp = sys_microseconds64(get<microseconds64>(srep_v, "MIDP"));
   const auto srep_radi = get<microseconds32>(srep_v, "RADI");
   if(srep_midp < cert_dele_mint) {
      throw Roughtime_Error("Midpoint earlier than delegation start");
   }
   if(srep_midp > cert_dele_maxt) {
      throw Roughtime_Error("Midpoint later than delegation end");
   }
   return {cert_dele, cert_sig, srep_midp, srep_radi};
}

bool Response::validate(const Ed25519_PublicKey& pk) const {
   const char context[] = "RoughTime v1 delegation signature--";
   PK_Verifier verifier(pk, "Pure");
   verifier.update(cast_char_ptr_to_uint8(context), sizeof(context));  //add context including \0
   verifier.update(m_cert_dele.data(), m_cert_dele.size());
   return verifier.check_signature(m_cert_sig.data(), m_cert_sig.size());
}

Nonce nonce_from_blind(const std::vector<uint8_t>& previous_response, const Nonce& blind) {
   std::array<uint8_t, 64> ret{};
   const auto blind_arr = blind.get_nonce();
   auto hash = HashFunction::create_or_throw("SHA-512");
   hash->update(previous_response);
   hash->update(hash->final());
   hash->update(blind_arr.data(), blind_arr.size());
   hash->final(ret.data());

   return ret;
}

Chain::Chain(std::string_view str) {
   std::istringstream ss{std::string(str)};  // FIXME C++23 avoid copy
   const std::string ERROR_MESSAGE = "Line does not have 4 space separated fields";
   for(std::string s; std::getline(ss, s);) {
      size_t start = 0, end = 0;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto publicKeyType = s.substr(start, end - start);
      if(publicKeyType != "ed25519") {
         throw Not_Implemented("Only ed25519 publicKeyType is implemented");
      }

      start = end + 1;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto serverPublicKey = Ed25519_PublicKey(base64_decode(s.substr(start, end - start)));

      start = end + 1;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      if((end - start) != 88) {
         throw Decoding_Error("Nonce has invalid length");
      }
      const auto vec = base64_decode(s.substr(start, end - start));
      const auto nonceOrBlind = Nonce(vector_to_array<64>(base64_decode(s.substr(start, end - start))));

      start = end + 1;
      end = s.find(' ', start);
      if(end != std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto response = unlock(base64_decode(s.substr(start)));

      m_links.push_back({response, serverPublicKey, nonceOrBlind});
   }
}

std::vector<Response> Chain::responses() const {
   std::vector<Response> responses;
   for(unsigned i = 0; i < m_links.size(); ++i) {
      const auto& l = m_links[i];
      const auto nonce = i ? nonce_from_blind(m_links[i - 1].response(), l.nonce_or_blind()) : l.nonce_or_blind();
      const auto response = Response::from_bits(l.response(), nonce);
      if(!response.validate(l.public_key())) {
         throw Roughtime_Error("Invalid signature or public key");
      }
      responses.push_back(response);
   }
   return responses;
}

Nonce Chain::next_nonce(const Nonce& blind) const {
   return m_links.empty() ? blind : nonce_from_blind(m_links.back().response(), blind);
}

void Chain::append(const Link& new_link, size_t max_chain_size) {
   if(max_chain_size <= 0) {
      throw Invalid_Argument("Max chain size must be positive");
   }

   while(m_links.size() >= max_chain_size) {
      if(m_links.size() == 1) {
         auto new_link_updated = new_link;
         new_link_updated.nonce_or_blind() =
            nonce_from_blind(m_links[0].response(), new_link.nonce_or_blind());  //we need to convert blind to nonce
         m_links.clear();
         m_links.push_back(new_link_updated);
         return;
      }
      if(m_links.size() >= 2) {
         m_links[1].nonce_or_blind() =
            nonce_from_blind(m_links[0].response(), m_links[1].nonce_or_blind());  //we need to convert blind to nonce
      }
      m_links.erase(m_links.begin());
   }
   m_links.push_back(new_link);
}

std::string Chain::to_string() const {
   std::string s;
   s.reserve((7 + 1 + 88 + 1 + 44 + 1 + 480) * m_links.size());
   for(const auto& link : m_links) {
      s += "ed25519";
      s += ' ';
      s += base64_encode(link.public_key().get_public_key());
      s += ' ';
      s += base64_encode(link.nonce_or_blind().get_nonce().data(), link.nonce_or_blind().get_nonce().size());
      s += ' ';
      s += base64_encode(link.response());
      s += '\n';
   }
   return s;
}

std::vector<uint8_t> online_request(std::string_view uri, const Nonce& nonce, std::chrono::milliseconds timeout) {
   const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();
   auto socket = OS::open_socket_udp(uri, timeout);
   if(!socket) {
      throw Not_Implemented("No socket support enabled in build");
   }

   const auto encoded = encode_request(nonce);
   socket->write(encoded.data(), encoded.size());

   if(std::chrono::system_clock::now() - start_time > timeout) {
      throw System_Error("Timeout during socket write");
   }

   std::vector<uint8_t> buffer;
   buffer.resize(360 + 64 * 10 + 1);  //response basic size is 360 bytes + 64 bytes for each level of merkle tree
                                      //add one additional byte to be able to differentiate if datagram got truncated
   const auto n = socket->read(buffer.data(), buffer.size());

   if(!n || std::chrono::system_clock::now() - start_time > timeout) {
      throw System_Error("Timeout waiting for response");
   }

   if(n == buffer.size()) {
      throw System_Error("Buffer too small");
   }

   buffer.resize(n);
   return buffer;
}

std::vector<Server_Information> servers_from_str(std::string_view str) {
   std::vector<Server_Information> servers;
   std::istringstream ss{std::string(str)};  // FIXME C++23 avoid copy

   const std::string ERROR_MESSAGE = "Line does not have at least 5 space separated fields";
   for(std::string s; std::getline(ss, s);) {
      size_t start = 0, end = 0;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto name = s.substr(start, end - start);

      start = end + 1;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto publicKeyType = s.substr(start, end - start);
      if(publicKeyType != "ed25519") {
         throw Not_Implemented("Only ed25519 publicKeyType is implemented");
      }

      start = end + 1;
      end = s.find(' ', start);

      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto publicKeyBase64 = s.substr(start, end - start);
      const auto publicKey = Ed25519_PublicKey(base64_decode(publicKeyBase64));

      start = end + 1;
      end = s.find(' ', start);
      if(end == std::string::npos) {
         throw Decoding_Error(ERROR_MESSAGE);
      }
      const auto protocol = s.substr(start, end - start);
      if(protocol != "udp") {
         throw Not_Implemented("Only UDP protocol is implemented");
      }

      const auto addresses = [&]() {
         std::vector<std::string> addr;
         for(;;) {
            start = end + 1;
            end = s.find(' ', start);
            const auto address = s.substr(start, (end == std::string::npos) ? std::string::npos : end - start);
            if(address.empty()) {
               return addr;
            }
            addr.push_back(address);
            if(end == std::string::npos) {
               return addr;
            }
         }
      }();
      if(addresses.empty()) {
         throw Decoding_Error(ERROR_MESSAGE);
      }

      servers.push_back({name, publicKey, addresses});
   }
   return servers;
}

}  // namespace Roughtime

}  // namespace Botan

1	/*
2	* Roughtime
3	* (C) 2019 Nuno Goncalves <nunojpg@gmail.com>
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/roughtime.h>
9
10	#include <botan/base64.h>
11	#include <botan/hash.h>
12	#include <botan/pubkey.h>
13	#include <botan/rng.h>
14	#include <botan/internal/socket_udp.h>
15
16	#include <cmath>
17	#include <map>
18	#include <sstream>
19
20	namespace Botan {
21
22	namespace {
23
24	// This exists to work around a LGTM false positive
25	static_assert(Roughtime::request_min_size == 1024, "Expected minimum size");
26
27	template <class T>
28	struct is_array : std::false_type {};
29
30	template <class T, std::size_t N>
31	struct is_array<std::array<T, N>> : std::true_type {};
32
33	template <typename T>
34	T impl_from_little_endian(const uint8_t* t, const size_t i)	921✔
35	requires(sizeof(T) <= sizeof(int64_t))
36	{
37	return T(static_cast<int64_t>(t[i]) << i * 8) + (i == 0 ? T(0) : impl_from_little_endian<T>(t, i - 1));	1,856✔
38	}
39
40	template <typename T>
41	T from_little_endian(const uint8_t* t) {	369✔
42	return impl_from_little_endian<T>(t, sizeof(T) - 1);	369✔
43	}
44
45	template <typename T, std::enable_if_t<is_array<T>::value>* = nullptr>
46	T copy(const uint8_t* t) {	142✔
47	return typecast_copy<T>(t); //arrays are endianess indepedent, so we do a memcpy	142✔
48	}
49
50	template <typename T, std::enable_if_t<!is_array<T>::value>* = nullptr>
51	T copy(const uint8_t* t) {	92✔
52	return from_little_endian<T>(	92✔
53	t); //other types are arithmetic, so we account that roughtime serializes as little endian
54	}
55
56	template <typename T>
57	std::map<std::string, std::vector<uint8_t>> unpack_roughtime_packet(T bytes) {	124✔
58	if(bytes.size() < 8) {	94✔
59	throw Roughtime::Roughtime_Error("Map length is under minimum of 8 bytes");	1✔
60	}
61	const auto buf = bytes.data();	123✔
62	const uint32_t num_tags = buf[0];	123✔
63	const uint32_t start_content = num_tags * 8;	123✔
64	if(start_content > bytes.size()) {	123✔
65	throw Roughtime::Roughtime_Error("Map length too small to contain all tags");	1✔
66	}
67	uint32_t start = start_content;	122✔
68	std::map<std::string, std::vector<uint8_t>> tags;	122✔
69	for(uint32_t i = 0; i < num_tags; ++i) {	517✔
70	const size_t end =	457✔
71	((i + 1) == num_tags) ? bytes.size() : start_content + from_little_endian<uint32_t>(buf + 4 + i * 4);	614✔
72	if(end > bytes.size()) {	367✔
73	throw Roughtime::Roughtime_Error("Tag end index out of bounds");	1✔
74	}
75	if(end < start) {	396✔
76	throw Roughtime::Roughtime_Error("Tag offset must be more than previous tag offset");	1✔
77	}
78	const char* label_ptr = cast_uint8_ptr_to_char(buf) + (num_tags + i) * 4;	395✔
79	const char label[] = {label_ptr[0], label_ptr[1], label_ptr[2], label_ptr[3], 0};	395✔
80	auto ret = tags.emplace(label, std::vector<uint8_t>(buf + start, buf + end));	792✔
81	if(!ret.second) {	395✔
82	throw Roughtime::Roughtime_Error(std::string("Map has duplicated tag: ") + label);	×
83	}
84	start = static_cast<uint32_t>(end);	395✔
85	}
86	return tags;	120✔
87	}	2✔
88
89	template <typename T>
90	T get(const std::map<std::string, std::vector<uint8_t>>& map, const std::string& label) {	262✔
91	const auto& tag = map.find(label);	262✔
92	if(tag == map.end()) {	262✔
93	throw Roughtime::Roughtime_Error("Tag " + label + " not found");	2✔
94	}
95	if(tag->second.size() != sizeof(T)) {	261✔
96	throw Roughtime::Roughtime_Error("Tag " + label + " has unexpected size");	2✔
97	}
98	return copy<T>(tag->second.data());	260✔
99	}
100
101	const std::vector<uint8_t>& get_v(const std::map<std::string, std::vector<uint8_t>>& map, const std::string& label) {	87✔
102	const auto& tag = map.find(label);	87✔
103	if(tag == map.end()) {	87✔
104	throw Roughtime::Roughtime_Error("Tag " + label + " not found");	2✔
105	}
106	return tag->second;	86✔
107	}
108
109	bool verify_signature(const std::array<uint8_t, 32>& pk,	27✔
110	const std::vector<uint8_t>& payload,
111	const std::array<uint8_t, 64>& signature) {
112	const char context[] = "RoughTime v1 response signature";	27✔
113	Ed25519_PublicKey key(std::vector<uint8_t>(pk.data(), pk.data() + pk.size()));	54✔
114	PK_Verifier verifier(key, "Pure");	27✔
115	verifier.update(cast_char_ptr_to_uint8(context), sizeof(context)); //add context including \0	27✔
116	verifier.update(payload);	27✔
117	return verifier.check_signature(signature.data(), signature.size());	54✔
118	}	27✔
119
120	std::array<uint8_t, 64> hashLeaf(const std::array<uint8_t, 64>& leaf) {	24✔
121	std::array<uint8_t, 64> ret{};	24✔
122	auto hash = HashFunction::create_or_throw("SHA-512");	24✔
123	hash->update(0);	24✔
124	hash->update(leaf.data(), leaf.size());	24✔
125	hash->final(ret.data());	24✔
126	return ret;	24✔
127	}	24✔
128
129	void hashNode(std::array<uint8_t, 64>& hash, const std::array<uint8_t, 64>& node, bool reverse) {	3✔
130	auto h = HashFunction::create_or_throw("SHA-512");	3✔
131	h->update(1);	3✔
132	if(reverse) {	3✔
133	h->update(node.data(), node.size());	2✔
134	h->update(hash.data(), hash.size());	2✔
135	} else {
136	h->update(hash.data(), hash.size());	1✔
137	h->update(node.data(), node.size());	1✔
138	}
139	h->final(hash.data());	3✔
140	}	3✔
141
142	template <size_t N, typename T>
143	std::array<uint8_t, N> vector_to_array(std::vector<uint8_t, T> vec) {	13✔
144	if(vec.size() != N) {	13✔
145	throw std::logic_error("Invalid vector size");	×
146	}
147	return typecast_copy<std::array<uint8_t, N>>(vec.data());	13✔
148	}
149	} // namespace
150
151	namespace Roughtime {
152
153	Nonce::Nonce(const std::vector<uint8_t>& nonce) {	27✔
154	if(nonce.size() != 64) {	27✔
155	throw Invalid_Argument("Roughtime nonce must be 64 bytes long");	2✔
156	}
157	m_nonce = typecast_copy<std::array<uint8_t, 64>>(nonce.data());	25✔
158	}	25✔
159
160	Nonce::Nonce(RandomNumberGenerator& rng) {	6✔
161	rng.randomize(m_nonce.data(), m_nonce.size());	6✔
162	}	6✔
163
164	std::array<uint8_t, request_min_size> encode_request(const Nonce& nonce) {	8✔
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}};	8✔
166	std::memcpy(buf.data() + 16, nonce.get_nonce().data(), nonce.get_nonce().size());	8✔
167	std::memset(buf.data() + 16 + nonce.get_nonce().size(), 0, buf.size() - 16 - nonce.get_nonce().size());	8✔
168	return buf;	8✔
169	}
170
171	Response Response::from_bits(const std::vector<uint8_t>& response, const Nonce& nonce) {	34✔
172	const auto response_v = unpack_roughtime_packet(response);	34✔
173	const auto cert = unpack_roughtime_packet(get_v(response_v, "CERT"));	71✔
174	const auto cert_dele = get<std::array<uint8_t, 72>>(cert, "DELE");	30✔
175	const auto cert_sig = get<std::array<uint8_t, 64>>(cert, "SIG");	39✔
176	const auto cert_dele_v = unpack_roughtime_packet(cert_dele);	30✔
177	const auto srep = get_v(response_v, "SREP");	39✔
178	const auto srep_v = unpack_roughtime_packet(srep);	39✔
179
180	const auto cert_dele_pubk = get<std::array<uint8_t, 32>>(cert_dele_v, "PUBK");	29✔
181	const auto sig = get<std::array<uint8_t, 64>>(response_v, "SIG");	31✔
182	if(!verify_signature(cert_dele_pubk, srep, sig)) {	27✔
183	throw Roughtime_Error("Response signature invalid");	1✔
184	}
185
186	const auto indx = get<uint32_t>(response_v, "INDX");	26✔
187	const auto path = get_v(response_v, "PATH");	34✔
188	const auto srep_root = get<std::array<uint8_t, 64>>(srep_v, "ROOT");	26✔
189	const size_t size = path.size();	26✔
190	const size_t levels = size / 64;	26✔
191
192	if(size % 64) {	26✔
193	throw Roughtime_Error("Merkle tree path size must be multiple of 64 bytes");	1✔
194	}
195	if(indx >= (1U << levels)) {	25✔
196	throw Roughtime_Error("Merkle tree path is too short");	1✔
197	}
198
199	auto hash = hashLeaf(nonce.get_nonce());	24✔
200	auto index = indx;
201	size_t level = 0;
202	while(level < levels) {	27✔
203	hashNode(hash, typecast_copy<std::array<uint8_t, 64>>(path.data() + level * 64), index & 1);	3✔
204	++level;	3✔
205	index >>= 1;	3✔
206	}
207
208	if(srep_root != hash) {	24✔
209	throw Roughtime_Error("Nonce verification failed");	1✔
210	}
211
212	const auto cert_dele_maxt = sys_microseconds64(get<microseconds64>(cert_dele_v, "MAXT"));	23✔
213	const auto cert_dele_mint = sys_microseconds64(get<microseconds64>(cert_dele_v, "MINT"));	23✔
214	const auto srep_midp = sys_microseconds64(get<microseconds64>(srep_v, "MIDP"));	23✔
215	const auto srep_radi = get<microseconds32>(srep_v, "RADI");	28✔
216	if(srep_midp < cert_dele_mint) {	46✔
217	throw Roughtime_Error("Midpoint earlier than delegation start");	1✔
218	}
219	if(srep_midp > cert_dele_maxt) {	44✔
220	throw Roughtime_Error("Midpoint later than delegation end");	1✔
221	}
222	return {cert_dele, cert_sig, srep_midp, srep_radi};	21✔
223	}	82✔
224
225	bool Response::validate(const Ed25519_PublicKey& pk) const {	20✔
226	const char context[] = "RoughTime v1 delegation signature--";	20✔
227	PK_Verifier verifier(pk, "Pure");	20✔
228	verifier.update(cast_char_ptr_to_uint8(context), sizeof(context)); //add context including \0	20✔
229	verifier.update(m_cert_dele.data(), m_cert_dele.size());	20✔
230	return verifier.check_signature(m_cert_sig.data(), m_cert_sig.size());	40✔
231	}	20✔
232
233	Nonce nonce_from_blind(const std::vector<uint8_t>& previous_response, const Nonce& blind) {	11✔
234	std::array<uint8_t, 64> ret{};	11✔
235	const auto blind_arr = blind.get_nonce();	11✔
236	auto hash = HashFunction::create_or_throw("SHA-512");	11✔
237	hash->update(previous_response);	11✔
238	hash->update(hash->final());	11✔
239	hash->update(blind_arr.data(), blind_arr.size());	11✔
240	hash->final(ret.data());	11✔
241
242	return ret;	11✔
243	}	11✔
244
245	Chain::Chain(std::string_view str) {	13✔
246	std::istringstream ss{std::string(str)}; // FIXME C++23 avoid copy	26✔
247	const std::string ERROR_MESSAGE = "Line does not have 4 space separated fields";	13✔
248	for(std::string s; std::getline(ss, s);) {	25✔
249	size_t start = 0, end = 0;	19✔
250	end = s.find(' ', start);	19✔
251	if(end == std::string::npos) {	19✔
252	throw Decoding_Error(ERROR_MESSAGE);	1✔
253	}
254	const auto publicKeyType = s.substr(start, end - start);	18✔
255	if(publicKeyType != "ed25519") {	18✔
256	throw Not_Implemented("Only ed25519 publicKeyType is implemented");	1✔
257	}
258
259	start = end + 1;	17✔
260	end = s.find(' ', start);	17✔
261	if(end == std::string::npos) {	17✔
262	throw Decoding_Error(ERROR_MESSAGE);	1✔
263	}
264	const auto serverPublicKey = Ed25519_PublicKey(base64_decode(s.substr(start, end - start)));	53✔
265
266	start = end + 1;	15✔
267	end = s.find(' ', start);	15✔
268	if(end == std::string::npos) {	15✔
269	throw Decoding_Error(ERROR_MESSAGE);	1✔
270	}
271	if((end - start) != 88) {	14✔
272	throw Decoding_Error("Nonce has invalid length");	1✔
273	}
274	const auto vec = base64_decode(s.substr(start, end - start));	13✔
275	const auto nonceOrBlind = Nonce(vector_to_array<64>(base64_decode(s.substr(start, end - start))));	26✔
276
277	start = end + 1;	13✔
278	end = s.find(' ', start);	13✔
279	if(end != std::string::npos) {	13✔
280	throw Decoding_Error(ERROR_MESSAGE);	1✔
281	}
282	const auto response = unlock(base64_decode(s.substr(start)));	37✔
283
284	m_links.push_back({response, serverPublicKey, nonceOrBlind});	24✔
285	}	46✔
286	}	20✔
287
288	std::vector<Response> Chain::responses() const {	7✔
289	std::vector<Response> responses;	7✔
290	for(unsigned i = 0; i < m_links.size(); ++i) {	17✔
291	const auto& l = m_links[i];	11✔
292	const auto nonce = i ? nonce_from_blind(m_links[i - 1].response(), l.nonce_or_blind()) : l.nonce_or_blind();	11✔
293	const auto response = Response::from_bits(l.response(), nonce);	11✔
294	if(!response.validate(l.public_key())) {	11✔
295	throw Roughtime_Error("Invalid signature or public key");	1✔
296	}
297	responses.push_back(response);	10✔
298	}
299	return responses;	6✔
300	}	1✔
301
302	Nonce Chain::next_nonce(const Nonce& blind) const {	4✔
303	return m_links.empty() ? blind : nonce_from_blind(m_links.back().response(), blind);	4✔
304	}
305
306	void Chain::append(const Link& new_link, size_t max_chain_size) {	6✔
307	if(max_chain_size <= 0) {	6✔
308	throw Invalid_Argument("Max chain size must be positive");	1✔
309	}
310
311	while(m_links.size() >= max_chain_size) {	6✔
312	if(m_links.size() == 1) {	2✔
313	auto new_link_updated = new_link;	1✔
314	new_link_updated.nonce_or_blind() =	1✔
315	nonce_from_blind(m_links[0].response(), new_link.nonce_or_blind()); //we need to convert blind to nonce	1✔
316	m_links.clear();	1✔
317	m_links.push_back(new_link_updated);	1✔
318	return;	1✔
319	}	1✔
320	if(m_links.size() >= 2) {	1✔
321	m_links[1].nonce_or_blind() =	1✔
322	nonce_from_blind(m_links[0].response(), m_links[1].nonce_or_blind()); //we need to convert blind to nonce	1✔
323	}
324	m_links.erase(m_links.begin());	1✔
325	}
326	m_links.push_back(new_link);	4✔
327	}
328
329	std::string Chain::to_string() const {	4✔
330	std::string s;	4✔
331	s.reserve((7 + 1 + 88 + 1 + 44 + 1 + 480) * m_links.size());	4✔
332	for(const auto& link : m_links) {	11✔
333	s += "ed25519";	7✔
334	s += ' ';	7✔
335	s += base64_encode(link.public_key().get_public_key());	14✔
336	s += ' ';	7✔
337	s += base64_encode(link.nonce_or_blind().get_nonce().data(), link.nonce_or_blind().get_nonce().size());	14✔
338	s += ' ';	7✔
339	s += base64_encode(link.response());	14✔
340	s += '\n';	14✔
341	}
342	return s;	4✔
343	}	×
344
345	std::vector<uint8_t> online_request(std::string_view uri, const Nonce& nonce, std::chrono::milliseconds timeout) {	6✔
346	const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();	6✔
347	auto socket = OS::open_socket_udp(uri, timeout);	6✔
348	if(!socket) {	6✔
349	throw Not_Implemented("No socket support enabled in build");	×
350	}
351
352	const auto encoded = encode_request(nonce);	6✔
353	socket->write(encoded.data(), encoded.size());	6✔
354
355	if(std::chrono::system_clock::now() - start_time > timeout) {	12✔
356	throw System_Error("Timeout during socket write");	×
357	}
358
359	std::vector<uint8_t> buffer;	6✔
360	buffer.resize(360 + 64 * 10 + 1); //response basic size is 360 bytes + 64 bytes for each level of merkle tree	6✔
361	//add one additional byte to be able to differentiate if datagram got truncated
362	const auto n = socket->read(buffer.data(), buffer.size());	6✔
363
364	if(!n \|\| std::chrono::system_clock::now() - start_time > timeout) {	12✔
365	throw System_Error("Timeout waiting for response");	×
366	}
367
368	if(n == buffer.size()) {	6✔
369	throw System_Error("Buffer too small");	×
370	}
371
372	buffer.resize(n);	6✔
373	return buffer;	6✔
374	}	6✔
375
376	std::vector<Server_Information> servers_from_str(std::string_view str) {	12✔
377	std::vector<Server_Information> servers;	12✔
378	std::istringstream ss{std::string(str)}; // FIXME C++23 avoid copy	24✔
379
380	const std::string ERROR_MESSAGE = "Line does not have at least 5 space separated fields";	12✔
381	for(std::string s; std::getline(ss, s);) {	20✔
382	size_t start = 0, end = 0;	16✔
383	end = s.find(' ', start);	16✔
384	if(end == std::string::npos) {	16✔
385	throw Decoding_Error(ERROR_MESSAGE);	1✔
386	}
387	const auto name = s.substr(start, end - start);	15✔
388
389	start = end + 1;	15✔
390	end = s.find(' ', start);	15✔
391	if(end == std::string::npos) {	15✔
392	throw Decoding_Error(ERROR_MESSAGE);	1✔
393	}
394	const auto publicKeyType = s.substr(start, end - start);	14✔
395	if(publicKeyType != "ed25519") {	14✔
396	throw Not_Implemented("Only ed25519 publicKeyType is implemented");	1✔
397	}
398
399	start = end + 1;	13✔
400	end = s.find(' ', start);	13✔
401
402	if(end == std::string::npos) {	13✔
403	throw Decoding_Error(ERROR_MESSAGE);	1✔
404	}
405	const auto publicKeyBase64 = s.substr(start, end - start);	12✔
406	const auto publicKey = Ed25519_PublicKey(base64_decode(publicKeyBase64));	27✔
407
408	start = end + 1;	11✔
409	end = s.find(' ', start);	11✔
410	if(end == std::string::npos) {	11✔
411	throw Decoding_Error(ERROR_MESSAGE);	1✔
412	}
413	const auto protocol = s.substr(start, end - start);	10✔
414	if(protocol != "udp") {	10✔
415	throw Not_Implemented("Only UDP protocol is implemented");	1✔
416	}
417
418	const auto addresses = [&]() {	18✔
419	std::vector<std::string> addr;	9✔
420	for(;;) {	9✔
421	start = end + 1;	17✔
422	end = s.find(' ', start);	9✔
423	const auto address = s.substr(start, (end == std::string::npos) ? std::string::npos : end - start);	9✔
424	if(address.empty()) {	9✔
425	return addr;
426	}
427	addr.push_back(address);	8✔
428	if(end == std::string::npos) {	8✔
429	return addr;
430	}
431	}	9✔
432	}();	11✔
433	if(addresses.empty()) {	9✔
434	throw Decoding_Error(ERROR_MESSAGE);	1✔
435	}
436
437	servers.push_back({name, publicKey, addresses});	16✔
438	}	52✔
439	return servers;	8✔
440	}	20✔
441
442	} // namespace Roughtime
443
444	} // namespace Botan

randombit / botan / 5841327280

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