mirror of
https://github.com/oxen-io/lokinet.git
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b81f7025c9
Replaces custom logging system with spdlog-based oxen logging. This
commit mainly replaces the backend logging with the spdlog-based system,
but doesn't (yet) convert all the existing LogWarn, etc. to use the new
format-based logging.
New logging statements will look like:
llarp::log::warning(cat, "blah: {}", val);
where `cat` should be set up in each .cpp or cluster of .cpp files, as
described in the oxen-logging README.
As part of spdlog we get fmt, which gives us nice format strings, where
are applied generously in this commit.
Making types printable now requires two steps:
- add a ToString() method
- add this specialization:
template <>
constexpr inline bool llarp::IsToStringFormattable<llarp::Whatever> = true;
This will then allow the type to be printed as a "{}" value in a
fmt::format string. This is applied to all our printable types here,
and all of the `operator<<` are removed.
This commit also:
- replaces various uses of `operator<<` to ToString()
- replaces various uses of std::stringstream with either fmt::format or
plain std::string
- Rename some to_string and toString() methods to ToString() for
consistency (and to work with fmt)
- Replace `stringify(...)` and `make_exception` usage with fmt::format
(and remove stringify/make_exception from util/str.hpp).
157 lines
3.7 KiB
C++
157 lines
3.7 KiB
C++
#include "encrypted_frame.hpp"
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#include "crypto.hpp"
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#include <llarp/util/logging.hpp>
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#include <llarp/util/mem.hpp>
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namespace llarp
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{
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bool
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EncryptedFrame::DoEncrypt(const SharedSecret& shared, bool noDH)
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{
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byte_t* hash = data();
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byte_t* noncePtr = hash + SHORTHASHSIZE;
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byte_t* pubkey = noncePtr + TUNNONCESIZE;
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byte_t* body = pubkey + PUBKEYSIZE;
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auto crypto = CryptoManager::instance();
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// if noDH flag, means key exchange has already taken place
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// in this case, set pubkey to random noise and choose a
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// random nonce here
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if (noDH)
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{
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crypto->randbytes(noncePtr, TUNNONCESIZE);
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crypto->randbytes(pubkey, PUBKEYSIZE);
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}
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TunnelNonce nonce(noncePtr);
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llarp_buffer_t buf;
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buf.base = body;
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buf.cur = buf.base;
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buf.sz = size() - EncryptedFrameOverheadSize;
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// encrypt body
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if (!crypto->xchacha20(buf, shared, nonce))
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{
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llarp::LogError("encrypt failed");
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return false;
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}
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// generate message auth
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buf.base = noncePtr;
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buf.cur = buf.base;
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buf.sz = size() - SHORTHASHSIZE;
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if (!crypto->hmac(hash, buf, shared))
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{
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llarp::LogError("Failed to generate message auth");
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return false;
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}
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return true;
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}
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bool
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EncryptedFrame::EncryptInPlace(const SecretKey& ourSecretKey, const PubKey& otherPubkey)
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{
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// format of frame is
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// <32 bytes keyed hash of following data>
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// <32 bytes nonce>
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// <32 bytes pubkey>
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// <N bytes encrypted payload>
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//
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byte_t* hash = data();
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byte_t* noncePtr = hash + SHORTHASHSIZE;
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byte_t* pubkey = noncePtr + TUNNONCESIZE;
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SharedSecret shared;
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auto crypto = CryptoManager::instance();
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// set our pubkey
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memcpy(pubkey, ourSecretKey.toPublic().data(), PUBKEYSIZE);
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// randomize nonce
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crypto->randbytes(noncePtr, TUNNONCESIZE);
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TunnelNonce nonce(noncePtr);
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// derive shared key
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if (!crypto->dh_client(shared, otherPubkey, ourSecretKey, nonce))
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{
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llarp::LogError("DH failed");
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return false;
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}
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return DoEncrypt(shared, false);
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}
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bool
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EncryptedFrame::DoDecrypt(const SharedSecret& shared)
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{
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ShortHash hash(data());
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byte_t* noncePtr = data() + SHORTHASHSIZE;
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byte_t* body = data() + EncryptedFrameOverheadSize;
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TunnelNonce nonce(noncePtr);
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auto crypto = CryptoManager::instance();
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llarp_buffer_t buf;
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buf.base = noncePtr;
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buf.cur = buf.base;
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buf.sz = size() - SHORTHASHSIZE;
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ShortHash digest;
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if (!crypto->hmac(digest.data(), buf, shared))
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{
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llarp::LogError("Digest failed");
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return false;
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}
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if (!std::equal(digest.begin(), digest.end(), hash.begin()))
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{
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llarp::LogError("message authentication failed");
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return false;
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}
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buf.base = body;
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buf.cur = body;
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buf.sz = size() - EncryptedFrameOverheadSize;
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if (!crypto->xchacha20(buf, shared, nonce))
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{
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llarp::LogError("decrypt failed");
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return false;
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}
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return true;
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}
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bool
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EncryptedFrame::DecryptInPlace(const SecretKey& ourSecretKey)
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{
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// format of frame is
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// <32 bytes keyed hash of following data>
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// <32 bytes nonce>
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// <32 bytes pubkey>
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// <N bytes encrypted payload>
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//
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byte_t* noncePtr = data() + SHORTHASHSIZE;
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TunnelNonce nonce(noncePtr);
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PubKey otherPubkey(noncePtr + TUNNONCESIZE);
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SharedSecret shared;
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auto crypto = CryptoManager::instance();
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// use dh_server because we are not the creator of this message
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if (!crypto->dh_server(shared, otherPubkey, ourSecretKey, nonce))
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{
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llarp::LogError("DH failed");
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return false;
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}
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return DoDecrypt(shared);
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}
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} // namespace llarp
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