forked from lix-project/lix
Separate auth and logic for the daemon
Before, processConnection wanted to know a user name and user id, and `nix-daemon --stdio`, when it isn't proxying to an underlying daemon, would just assume "root" and 0. But `nix-daemon --stdio` (no proxying) shouldn't make guesses about who holds the other end of its standard streams. Now processConnection takes an "auth hook", so `nix-daemon` can provide the appropriate policy and daemon.cc doesn't need to know or care what it is.
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574bf60b4d
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@ -2920,7 +2920,8 @@ void DerivationGoal::startDaemon()
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FdSink to(remote.get());
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try {
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daemon::processConnection(store, from, to,
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daemon::NotTrusted, daemon::Recursive, "nobody", 65535);
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daemon::NotTrusted, daemon::Recursive,
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[&](Store & store) { store.createUser("nobody", 65535); });
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debug("terminated daemon connection");
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} catch (SysError &) {
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ignoreException();
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@ -817,8 +817,7 @@ void processConnection(
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FdSink & to,
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TrustedFlag trusted,
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RecursiveFlag recursive,
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const std::string & userName,
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uid_t userId)
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std::function<void(Store &)> authHook)
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{
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auto monitor = !recursive ? std::make_unique<MonitorFdHup>(from.fd) : nullptr;
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@ -859,15 +858,7 @@ void processConnection(
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/* If we can't accept clientVersion, then throw an error
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*here* (not above). */
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#if 0
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/* Prevent users from doing something very dangerous. */
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if (geteuid() == 0 &&
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querySetting("build-users-group", "") == "")
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throw Error("if you run 'nix-daemon' as root, then you MUST set 'build-users-group'!");
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#endif
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store->createUser(userName, userId);
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authHook(*store);
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tunnelLogger->stopWork();
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to.flush();
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@ -12,7 +12,10 @@ void processConnection(
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FdSink & to,
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TrustedFlag trusted,
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RecursiveFlag recursive,
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const std::string & userName,
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uid_t userId);
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/* Arbitrary hook to check authorization / initialize user data / whatever
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after the protocol has been negotiated. The idea is that this function
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and everything it calls doesn't know about this stuff, and the
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`nix-daemon` handles that instead. */
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std::function<void(Store &)> authHook);
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}
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@ -239,7 +239,15 @@ static void daemonLoop(char * * argv)
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// Handle the connection.
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FdSource from(remote.get());
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FdSink to(remote.get());
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processConnection(openUncachedStore(), from, to, trusted, NotRecursive, user, peer.uid);
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processConnection(openUncachedStore(), from, to, trusted, NotRecursive, [&](Store & store) {
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#if 0
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/* Prevent users from doing something very dangerous. */
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if (geteuid() == 0 &&
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querySetting("build-users-group", "") == "")
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throw Error("if you run 'nix-daemon' as root, then you MUST set 'build-users-group'!");
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#endif
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store.createUser(user, peer.uid);
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});
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exit(0);
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}, options);
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@ -324,7 +332,10 @@ static int _main(int argc, char * * argv)
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} else {
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FdSource from(STDIN_FILENO);
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FdSink to(STDOUT_FILENO);
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processConnection(openUncachedStore(), from, to, Trusted, NotRecursive, "root", 0);
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/* Auth hook is empty because in this mode we blindly trust the
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standard streams. Limitting access to thoses is explicitly
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not `nix-daemon`'s responsibility. */
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processConnection(openUncachedStore(), from, to, Trusted, NotRecursive, [&](Store & _){});
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}
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} else {
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daemonLoop(argv);
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@ -2,6 +2,9 @@ source common.sh
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clearStore
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# Ensure "fake ssh" remote store works just as legacy fake ssh would.
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nix --store ssh-ng://localhost?remote-store=$TEST_ROOT/other-store doctor
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startDaemon
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storeCleared=1 NIX_REMOTE_=$NIX_REMOTE $SHELL ./user-envs.sh
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