mirror of https://github.com/oxen-io/lokinet
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70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
#include "name.hpp"
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#include <llarp/crypto/crypto.hpp>
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#include <llarp/util/str.hpp>
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namespace llarp::service
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{
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std::optional<Address>
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EncryptedName::Decrypt(std::string_view name) const
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{
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if (ciphertext.empty())
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return std::nullopt;
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const auto crypto = CryptoManager::instance();
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const auto maybe = crypto->maybe_decrypt_name(ciphertext, nonce, name);
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if (maybe.has_value())
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return Address{*maybe};
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return std::nullopt;
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}
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bool
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NameIsValid(std::string_view lnsName)
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{
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// make sure it ends with .loki because no fucking shit right?
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if (not ends_with(lnsName, ".loki"))
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return false;
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// strip off .loki suffix
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lnsName = lnsName.substr(0, lnsName.find_last_of('.'));
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// ensure chars are sane
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for (const auto ch : lnsName)
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{
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if (ch == '-')
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continue;
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if (ch == '.')
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continue;
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if (ch >= 'a' and ch <= 'z')
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continue;
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if (ch >= '0' and ch <= '9')
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continue;
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return false;
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}
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// split into domain parts
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const auto parts = split(lnsName, ".");
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// get root domain
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const auto primaryName = parts[parts.size() - 1];
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constexpr size_t MaxNameLen = 32;
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constexpr size_t MaxPunycodeNameLen = 63;
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// check against lns name blacklist
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if (primaryName == "localhost")
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return false;
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if (primaryName == "loki")
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return false;
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if (primaryName == "snode")
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return false;
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// check for dashes
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if (primaryName.find("-") == std::string_view::npos)
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return primaryName.size() <= MaxNameLen;
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// check for dashes and end or beginning
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if (*primaryName.begin() == '-' or *(primaryName.end() - 1) == '-')
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return false;
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// check for punycode name length
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if (primaryName.size() > MaxPunycodeNameLen)
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return false;
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// check for xn--
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return (primaryName[2] == '-' and primaryName[3] == '-')
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? (primaryName[0] == 'x' and primaryName[1] == 'n')
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: true;
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}
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} // namespace llarp::service
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