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nix verify: Support checking against signatures in other stores

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Typical usage is to check local paths using the signatures from a
binary cache:

  $ nix verify-paths -r /run/current-system -s https://cache.nixos.org
  path ‘/nix/store/c1k4zqfb74wba5sn4yflb044gvap0x6k-nixos-system-mandark-16.03.git.fc2d7a5M’ is untrusted
  ...
  checked 844 paths, 119 untrusted
This commit is contained in:
Eelco Dolstra 2016-03-30 11:18:54 +02:00
parent 88541569a2
commit 39a6abc0bc
1 changed files with 33 additions and 2 deletions
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35
src/nix/verify.cc
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@ -14,17 +14,24 @@ struct MixVerify : virtual Args
{
bool noContents = false;
bool noSigs = false;
Strings substituterUris;
MixVerify()
{
mkFlag(0, "no-contents", "do not verify the contents of each store path", &noContents);
mkFlag(0, "no-sigs", "do not verify whether each store path has a valid signature", &noSigs);
mkFlag('s', "substituter", {"store-uri"}, "use signatures from specified store", 1,
[&](Strings ss) { substituterUris.push_back(ss.front()); });
}
void verifyPaths(ref<Store> store, const Paths & storePaths)
{
restoreAffinity(); // FIXME
std::vector<ref<Store>> substituters;
for (auto & s : substituterUris)
substituters.push_back(openStoreAt(s));
auto publicKeys = getDefaultPublicKeys();
std::atomic<size_t> untrusted{0};
@ -56,7 +63,9 @@ struct MixVerify : virtual Args
auto doPath = [&](const Path & storePath) {
try {
progressBar.startActivity(format("checking ‘%s’") % storePath);
checkInterrupt();
auto activity(progressBar.startActivity(format("checking ‘%s’") % storePath));
auto info = store->queryPathInfo(storePath);
@ -78,7 +87,29 @@ struct MixVerify : virtual Args
if (!noSigs) {
if (!info.ultimate && !info.checkSignatures(publicKeys)) {
bool good = false;
if (info.ultimate)
good = true;
if (!good && info.checkSignatures(publicKeys))
good = true;
if (!good) {
for (auto & store2 : substituters) {
// FIXME: catch errors?
if (!store2->isValidPath(storePath)) continue;
auto info2 = store2->queryPathInfo(storePath);
auto info3(info);
info3.sigs = info2.sigs;
if (info3.checkSignatures(publicKeys)) {
good = true;
break;
}
}
}
if (!good) {
untrusted++;
printMsg(lvlError, format("path ‘%s’ is untrusted") % storePath);
}