127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
#include "crypto.hh"
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#include "util.hh"
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#include "globals.hh"
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#if HAVE_SODIUM
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#include <sodium.h>
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#endif
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namespace nix {
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static std::pair<std::string, std::string> split(const string & s)
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{
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size_t colon = s.find(':');
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if (colon == std::string::npos || colon == 0)
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return {"", ""};
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return {std::string(s, 0, colon), std::string(s, colon + 1)};
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}
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Key::Key(const string & s)
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{
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auto ss = split(s);
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name = ss.first;
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key = ss.second;
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if (name == "" || key == "")
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throw Error("secret key is corrupt");
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key = base64Decode(key);
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}
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SecretKey::SecretKey(const string & s)
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: Key(s)
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{
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#if HAVE_SODIUM
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if (key.size() != crypto_sign_SECRETKEYBYTES)
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throw Error("secret key is not valid");
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#endif
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}
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#if !HAVE_SODIUM
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[[noreturn]] static void noSodium()
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{
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throw Error("Nix was not compiled with libsodium, required for signed binary cache support");
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}
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#endif
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std::string SecretKey::signDetached(const std::string & data) const
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{
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#if HAVE_SODIUM
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unsigned char sig[crypto_sign_BYTES];
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unsigned long long sigLen;
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crypto_sign_detached(sig, &sigLen, (unsigned char *) data.data(), data.size(),
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(unsigned char *) key.data());
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return name + ":" + base64Encode(std::string((char *) sig, sigLen));
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#else
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noSodium();
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#endif
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}
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PublicKey SecretKey::toPublicKey() const
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{
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#if HAVE_SODIUM
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unsigned char pk[crypto_sign_PUBLICKEYBYTES];
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crypto_sign_ed25519_sk_to_pk(pk, (unsigned char *) key.data());
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return PublicKey(name, std::string((char *) pk, crypto_sign_PUBLICKEYBYTES));
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#else
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noSodium();
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#endif
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}
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PublicKey::PublicKey(const string & s)
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: Key(s)
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{
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#if HAVE_SODIUM
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if (key.size() != crypto_sign_PUBLICKEYBYTES)
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throw Error("public key is not valid");
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#endif
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}
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bool verifyDetached(const std::string & data, const std::string & sig,
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const PublicKeys & publicKeys)
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{
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#if HAVE_SODIUM
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auto ss = split(sig);
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auto key = publicKeys.find(ss.first);
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if (key == publicKeys.end()) return false;
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auto sig2 = base64Decode(ss.second);
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if (sig2.size() != crypto_sign_BYTES)
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throw Error("signature is not valid");
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return crypto_sign_verify_detached((unsigned char *) sig2.data(),
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(unsigned char *) data.data(), data.size(),
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(unsigned char *) key->second.key.data()) == 0;
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#else
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noSodium();
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#endif
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}
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PublicKeys getDefaultPublicKeys()
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{
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PublicKeys publicKeys;
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// FIXME: filter duplicates
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for (auto s : settings.trustedPublicKeys.get()) {
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PublicKey key(s);
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publicKeys.emplace(key.name, key);
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}
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for (auto secretKeyFile : settings.secretKeyFiles.get()) {
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try {
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SecretKey secretKey(readFile(secretKeyFile));
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publicKeys.emplace(secretKey.name, secretKey.toPublicKey());
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} catch (SysError & e) {
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/* Ignore unreadable key files. That's normal in a
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multi-user installation. */
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}
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}
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return publicKeys;
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}
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}
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