forked from lix-project/lix
Move restricted/pure-eval access control out of the evaluator and into the accessor
This commit is contained in:
Eelco Dolstra
parent
3bebaefcd0
commit
ea95327e72
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@ -260,9 +260,10 @@ void SourceExprCommand::completeInstallable(AddCompletions & completions, std::s
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evalSettings.pureEval = false;
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auto state = getEvalState();
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Expr *e = state->parseExprFromFile(
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resolveExprPath(state->checkSourcePath(lookupFileArg(*state, *file)))
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);
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auto e =
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state->parseExprFromFile(
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resolveExprPath(
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lookupFileArg(*state, *file)));
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Value root;
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state->eval(e, root);
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@ -509,7 +509,18 @@ EvalState::EvalState(
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, sOutputSpecified(symbols.create("outputSpecified"))
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, repair(NoRepair)
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, emptyBindings(0)
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, rootFS(makeFSInputAccessor(CanonPath::root))
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, rootFS(
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makeFSInputAccessor(
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CanonPath::root,
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evalSettings.restrictEval || evalSettings.pureEval
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? std::optional<std::set<CanonPath>>(std::set<CanonPath>())
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: std::nullopt,
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[](const CanonPath & path) -> RestrictedPathError {
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auto modeInformation = evalSettings.pureEval
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? "in pure evaluation mode (use '--impure' to override)"
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: "in restricted mode";
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throw RestrictedPathError("access to absolute path '%1%' is forbidden %2%", path, modeInformation);
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}))
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, corepkgsFS(makeMemoryInputAccessor())
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, internalFS(makeMemoryInputAccessor())
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, derivationInternal{corepkgsFS->addFile(
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@ -551,28 +562,10 @@ EvalState::EvalState(
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searchPath.elements.emplace_back(SearchPath::Elem::parse(i));
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}
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if (evalSettings.restrictEval || evalSettings.pureEval) {
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allowedPaths = PathSet();
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for (auto & i : searchPath.elements) {
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auto r = resolveSearchPathPath(i.path);
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if (!r) continue;
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auto path = std::move(*r);
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if (store->isInStore(path)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(path).first, closure);
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for (auto & path : closure)
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allowPath(path);
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} catch (InvalidPath &) {
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allowPath(path);
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}
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} else
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allowPath(path);
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}
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}
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/* Allow access to all paths in the search path. */
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if (rootFS->hasAccessControl())
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for (auto & i : searchPath.elements)
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resolveSearchPathPath(i.path, true);
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corepkgsFS->addFile(
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CanonPath("fetchurl.nix"),
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@ -590,14 +583,12 @@ EvalState::~EvalState()
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void EvalState::allowPath(const Path & path)
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{
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if (allowedPaths)
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allowedPaths->insert(path);
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rootFS->allowPath(CanonPath(path));
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}
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void EvalState::allowPath(const StorePath & storePath)
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{
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if (allowedPaths)
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allowedPaths->insert(store->toRealPath(storePath));
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rootFS->allowPath(CanonPath(store->toRealPath(storePath)));
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}
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void EvalState::allowAndSetStorePathString(const StorePath & storePath, Value & v)
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@ -607,54 +598,6 @@ void EvalState::allowAndSetStorePathString(const StorePath & storePath, Value &
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mkStorePathString(storePath, v);
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}
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SourcePath EvalState::checkSourcePath(const SourcePath & path_)
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{
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// Don't check non-rootFS accessors, they're in a different namespace.
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if (path_.accessor != ref<InputAccessor>(rootFS)) return path_;
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if (!allowedPaths) return path_;
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auto i = resolvedPaths.find(path_.path.abs());
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if (i != resolvedPaths.end())
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return i->second;
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bool found = false;
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/* First canonicalize the path without symlinks, so we make sure an
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* attacker can't append ../../... to a path that would be in allowedPaths
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* and thus leak symlink targets.
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*/
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Path abspath = canonPath(path_.path.abs());
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for (auto & i : *allowedPaths) {
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if (isDirOrInDir(abspath, i)) {
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found = true;
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break;
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}
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}
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if (!found) {
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auto modeInformation = evalSettings.pureEval
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? "in pure eval mode (use '--impure' to override)"
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: "in restricted mode";
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throw RestrictedPathError("access to absolute path '%1%' is forbidden %2%", abspath, modeInformation);
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}
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/* Resolve symlinks. */
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debug("checking access to '%s'", abspath);
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SourcePath path = rootPath(CanonPath(canonPath(abspath, true)));
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for (auto & i : *allowedPaths) {
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if (isDirOrInDir(path.path.abs(), i)) {
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resolvedPaths.insert_or_assign(path_.path.abs(), path);
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return path;
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}
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}
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throw RestrictedPathError("access to canonical path '%1%' is forbidden in restricted mode", path);
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}
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void EvalState::checkURI(const std::string & uri)
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{
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if (!evalSettings.restrictEval) return;
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@ -674,12 +617,12 @@ void EvalState::checkURI(const std::string & uri)
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/* If the URI is a path, then check it against allowedPaths as
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well. */
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if (hasPrefix(uri, "/")) {
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checkSourcePath(rootPath(CanonPath(uri)));
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rootFS->checkAllowed(CanonPath(uri));
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return;
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}
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if (hasPrefix(uri, "file://")) {
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checkSourcePath(rootPath(CanonPath(std::string(uri, 7))));
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rootFS->checkAllowed(CanonPath(uri.substr(7)));
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return;
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}
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@ -1181,10 +1124,8 @@ Value * ExprPath::maybeThunk(EvalState & state, Env & env)
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}
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void EvalState::evalFile(const SourcePath & path_, Value & v, bool mustBeTrivial)
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void EvalState::evalFile(const SourcePath & path, Value & v, bool mustBeTrivial)
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{
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auto path = checkSourcePath(path_);
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FileEvalCache::iterator i;
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if ((i = fileEvalCache.find(path)) != fileEvalCache.end()) {
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v = i->second;
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@ -1205,7 +1146,7 @@ void EvalState::evalFile(const SourcePath & path_, Value & v, bool mustBeTrivial
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e = j->second;
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if (!e)
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e = parseExprFromFile(checkSourcePath(resolvedPath));
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e = parseExprFromFile(resolvedPath);
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fileParseCache[resolvedPath] = e;
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@ -217,12 +217,6 @@ public:
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*/
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RepairFlag repair;
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/**
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* The allowed filesystem paths in restricted or pure evaluation
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* mode.
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*/
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std::optional<PathSet> allowedPaths;
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Bindings emptyBindings;
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/**
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@ -396,12 +390,6 @@ public:
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*/
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void allowAndSetStorePathString(const StorePath & storePath, Value & v);
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/**
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* Check whether access to a path is allowed and throw an error if
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* not. Otherwise return the canonicalised path.
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*/
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SourcePath checkSourcePath(const SourcePath & path);
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void checkURI(const std::string & uri);
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/**
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@ -445,13 +433,15 @@ public:
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SourcePath findFile(const SearchPath & searchPath, const std::string_view path, const PosIdx pos = noPos);
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/**
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* Try to resolve a search path value (not the optional key part)
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* Try to resolve a search path value (not the optional key part).
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*
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* If the specified search path element is a URI, download it.
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*
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* If it is not found, return `std::nullopt`
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*/
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std::optional<std::string> resolveSearchPathPath(const SearchPath::Path & path);
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std::optional<std::string> resolveSearchPathPath(
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const SearchPath::Path & elem,
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bool initAccessControl = false);
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/**
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* Evaluate an expression to normal form
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@ -756,6 +746,13 @@ public:
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*/
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[[nodiscard]] StringMap realiseContext(const NixStringContext & context);
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/* Call the binary path filter predicate used builtins.path etc. */
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bool callPathFilter(
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Value * filterFun,
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const SourcePath & path,
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std::string_view pathArg,
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PosIdx pos);
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private:
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/**
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@ -783,7 +783,7 @@ SourcePath EvalState::findFile(const SearchPath & searchPath, const std::string_
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}
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std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0)
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std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Path & value0, bool initAccessControl)
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{
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auto & value = value0.s;
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auto i = searchPathResolved.find(value);
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@ -800,7 +800,6 @@ std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Pa
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logWarning({
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.msg = hintfmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
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});
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res = std::nullopt;
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}
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}
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@ -814,6 +813,20 @@ std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Pa
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else {
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auto path = absPath(value);
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/* Allow access to paths in the search path. */
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if (initAccessControl) {
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allowPath(path);
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if (store->isInStore(path)) {
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try {
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StorePathSet closure;
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store->computeFSClosure(store->toStorePath(path).first, closure);
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for (auto & p : closure)
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allowPath(p);
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} catch (InvalidPath &) { }
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}
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}
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if (pathExists(path))
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res = { path };
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else {
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@ -829,7 +842,7 @@ std::optional<std::string> EvalState::resolveSearchPathPath(const SearchPath::Pa
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else
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debug("failed to resolve search path element '%s'", value);
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searchPathResolved[value] = res;
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searchPathResolved.emplace(value, res);
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return res;
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}
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@ -15,6 +15,7 @@
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#include "value-to-json.hh"
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#include "value-to-xml.hh"
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#include "primops.hh"
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#include "fs-input-accessor.hh"
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#include <boost/container/small_vector.hpp>
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#include <boost/regex.hpp>
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@ -90,8 +91,8 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
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for (auto & [outputName, outputPath] : outputs) {
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/* Add the output of this derivations to the allowed
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paths. */
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if (allowedPaths) {
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allowPath(outputPath);
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if (rootFS->hasAccessControl()) {
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allowPath(store->toRealPath(outputPath));
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}
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/* Get all the output paths corresponding to the placeholders we had */
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if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
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@ -110,27 +111,19 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
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return res;
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}
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struct RealisePathFlags {
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// Whether to check that the path is allowed in pure eval mode
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bool checkForPureEval = true;
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};
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static SourcePath realisePath(EvalState & state, const PosIdx pos, Value & v, const RealisePathFlags flags = {})
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static SourcePath realisePath(EvalState & state, const PosIdx pos, Value & v)
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{
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NixStringContext context;
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auto path = state.coerceToPath(noPos, v, context, "while realising the context of a path");
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try {
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if (!context.empty()) {
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if (!context.empty() && path.accessor == state.rootFS) {
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auto rewrites = state.realiseContext(context);
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auto realPath = state.toRealPath(rewriteStrings(path.path.abs(), rewrites), context);
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return {path.accessor, CanonPath(realPath)};
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}
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return flags.checkForPureEval
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? state.checkSourcePath(path)
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: path;
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} else
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return path;
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} catch (Error & e) {
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e.addTrace(state.positions[pos], "while realising the context of path '%s'", path);
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throw;
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@ -1493,7 +1486,7 @@ static void prim_storePath(EvalState & state, const PosIdx pos, Value * * args,
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}));
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NixStringContext context;
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auto path = state.checkSourcePath(state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to 'builtins.storePath'")).path;
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auto path = state.coerceToPath(pos, *args[0], context, "while evaluating the first argument passed to 'builtins.storePath'").path;
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/* Resolve symlinks in ‘path’, unless ‘path’ itself is a symlink
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directly in the store. The latter condition is necessary so
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e.g. nix-push does the right thing. */
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@ -1535,12 +1528,7 @@ static void prim_pathExists(EvalState & state, const PosIdx pos, Value * * args,
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{
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auto & arg = *args[0];
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/* We don’t check the path right now, because we don’t want to
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throw if the path isn’t allowed, but just return false (and we
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can’t just catch the exception here because we still want to
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throw if something in the evaluation of `arg` tries to
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access an unauthorized path). */
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auto path = realisePath(state, pos, arg, { .checkForPureEval = false });
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auto path = realisePath(state, pos, arg);
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/* SourcePath doesn't know about trailing slash. */
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auto mustBeDir = arg.type() == nString
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@ -1548,14 +1536,9 @@ static void prim_pathExists(EvalState & state, const PosIdx pos, Value * * args,
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|| arg.string_view().ends_with("/."));
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try {
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auto checked = state.checkSourcePath(path);
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auto st = checked.maybeLstat();
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auto st = path.maybeLstat();
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auto exists = st && (!mustBeDir || st->type == SourceAccessor::tDirectory);
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v.mkBool(exists);
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} catch (SysError & e) {
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/* Don't give away info from errors while canonicalising
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‘path’ in restricted mode. */
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v.mkBool(false);
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} catch (RestrictedPathError & e) {
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v.mkBool(false);
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}
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@ -1699,7 +1682,7 @@ static void prim_findFile(EvalState & state, const PosIdx pos, Value * * args, V
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auto path = state.forceStringNoCtx(*args[1], pos, "while evaluating the second argument passed to builtins.findFile");
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v.mkPath(state.checkSourcePath(state.findFile(searchPath, path, pos)));
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v.mkPath(state.findFile(searchPath, path, pos));
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}
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static RegisterPrimOp primop_findFile(PrimOp {
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@ -2178,11 +2161,35 @@ static RegisterPrimOp primop_toFile({
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.fun = prim_toFile,
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});
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bool EvalState::callPathFilter(
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Value * filterFun,
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const SourcePath & path,
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std::string_view pathArg,
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PosIdx pos)
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{
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auto st = path.lstat();
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/* Call the filter function. The first argument is the path, the
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second is a string indicating the type of the file. */
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Value arg1;
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arg1.mkString(pathArg);
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Value arg2;
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// assert that type is not "unknown"
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arg2.mkString(fileTypeToString(st.type));
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Value * args []{&arg1, &arg2};
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Value res;
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callFunction(*filterFun, 2, args, res, pos);
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return forceBool(res, pos, "while evaluating the return value of the path filter function");
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}
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static void addPath(
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EvalState & state,
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const PosIdx pos,
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std::string_view name,
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Path path,
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SourcePath path,
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Value * filterFun,
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FileIngestionMethod method,
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const std::optional<Hash> expectedHash,
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@ -2190,48 +2197,29 @@ static void addPath(
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const NixStringContext & context)
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{
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try {
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StorePathSet refs;
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if (path.accessor == state.rootFS && state.store->isInStore(path.path.abs())) {
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// FIXME: handle CA derivation outputs (where path needs to
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// be rewritten to the actual output).
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auto rewrites = state.realiseContext(context);
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path = state.toRealPath(rewriteStrings(path, rewrites), context);
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path = {state.rootFS, CanonPath(state.toRealPath(rewriteStrings(path.path.abs(), rewrites), context))};
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StorePathSet refs;
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if (state.store->isInStore(path)) {
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try {
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auto [storePath, subPath] = state.store->toStorePath(path);
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auto [storePath, subPath] = state.store->toStorePath(path.path.abs());
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// FIXME: we should scanForReferences on the path before adding it
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refs = state.store->queryPathInfo(storePath)->references;
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path = state.store->toRealPath(storePath) + subPath;
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path = {state.rootFS, CanonPath(state.store->toRealPath(storePath) + subPath)};
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} catch (Error &) { // FIXME: should be InvalidPathError
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}
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}
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path = evalSettings.pureEval && expectedHash
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? path
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: state.checkSourcePath(state.rootPath(CanonPath(path))).path.abs();
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PathFilter filter = filterFun ? ([&](const Path & path) {
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auto st = lstat(path);
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/* Call the filter function. The first argument is the path,
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the second is a string indicating the type of the file. */
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Value arg1;
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arg1.mkString(path);
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Value arg2;
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arg2.mkString(
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S_ISREG(st.st_mode) ? "regular" :
|
||||
S_ISDIR(st.st_mode) ? "directory" :
|
||||
S_ISLNK(st.st_mode) ? "symlink" :
|
||||
"unknown" /* not supported, will fail! */);
|
||||
|
||||
Value * args []{&arg1, &arg2};
|
||||
Value res;
|
||||
state.callFunction(*filterFun, 2, args, res, pos);
|
||||
|
||||
return state.forceBool(res, pos, "while evaluating the return value of the path filter function");
|
||||
}) : defaultPathFilter;
|
||||
std::unique_ptr<PathFilter> filter;
|
||||
if (filterFun)
|
||||
filter = std::make_unique<PathFilter>([&](const Path & p) {
|
||||
auto p2 = CanonPath(p);
|
||||
return state.callPathFilter(filterFun, {path.accessor, p2}, p2.abs(), pos);
|
||||
});
|
||||
|
||||
std::optional<StorePath> expectedStorePath;
|
||||
if (expectedHash)
|
||||
|
|
@ -2242,7 +2230,7 @@ static void addPath(
|
|||
});
|
||||
|
||||
if (!expectedHash || !state.store->isValidPath(*expectedStorePath)) {
|
||||
auto dstPath = state.rootPath(CanonPath(path)).fetchToStore(state.store, name, method, &filter, state.repair);
|
||||
auto dstPath = path.fetchToStore(state.store, name, method, filter.get(), state.repair);
|
||||
if (expectedHash && expectedStorePath != dstPath)
|
||||
state.debugThrowLastTrace(Error("store path mismatch in (possibly filtered) path added from '%s'", path));
|
||||
state.allowAndSetStorePathString(dstPath, v);
|
||||
|
|
@ -2261,7 +2249,8 @@ static void prim_filterSource(EvalState & state, const PosIdx pos, Value * * arg
|
|||
auto path = state.coerceToPath(pos, *args[1], context,
|
||||
"while evaluating the second argument (the path to filter) passed to 'builtins.filterSource'");
|
||||
state.forceFunction(*args[0], pos, "while evaluating the first argument passed to builtins.filterSource");
|
||||
addPath(state, pos, path.baseName(), path.path.abs(), args[0], FileIngestionMethod::Recursive, std::nullopt, v, context);
|
||||
|
||||
addPath(state, pos, path.baseName(), path, args[0], FileIngestionMethod::Recursive, std::nullopt, v, context);
|
||||
}
|
||||
|
||||
static RegisterPrimOp primop_filterSource({
|
||||
|
|
@ -2356,7 +2345,7 @@ static void prim_path(EvalState & state, const PosIdx pos, Value * * args, Value
|
|||
if (name.empty())
|
||||
name = path->baseName();
|
||||
|
||||
addPath(state, pos, name, path->path.abs(), filterFun, method, expectedHash, v, context);
|
||||
addPath(state, pos, name, *path, filterFun, method, expectedHash, v, context);
|
||||
}
|
||||
|
||||
static RegisterPrimOp primop_path({
|
||||
|
|
|
|||
|
|
@ -310,8 +310,11 @@ static void main_nix_build(int argc, char * * argv)
|
|||
else
|
||||
/* If we're in a #! script, interpret filenames
|
||||
relative to the script. */
|
||||
exprs.push_back(state->parseExprFromFile(resolveExprPath(state->checkSourcePath(lookupFileArg(*state,
|
||||
inShebang && !packages ? absPath(i, absPath(dirOf(script))) : i)))));
|
||||
exprs.push_back(
|
||||
state->parseExprFromFile(
|
||||
resolveExprPath(
|
||||
lookupFileArg(*state,
|
||||
inShebang && !packages ? absPath(i, absPath(dirOf(script))) : i))));
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -183,7 +183,7 @@ static int main_nix_instantiate(int argc, char * * argv)
|
|||
for (auto & i : files) {
|
||||
Expr * e = fromArgs
|
||||
? state->parseExprFromString(i, state->rootPath(CanonPath::fromCwd()))
|
||||
: state->parseExprFromFile(resolveExprPath(state->checkSourcePath(lookupFileArg(*state, i))));
|
||||
: state->parseExprFromFile(resolveExprPath(lookupFileArg(*state, i)));
|
||||
processExpr(*state, attrPaths, parseOnly, strict, autoArgs,
|
||||
evalOnly, outputKind, xmlOutputSourceLocation, e);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -14,8 +14,8 @@ nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix' -I sr
|
|||
(! nix-instantiate --restrict-eval --eval -E 'builtins.readDir ../../src/nix-channel')
|
||||
nix-instantiate --restrict-eval --eval -E 'builtins.readDir ../../src/nix-channel' -I src=../../src
|
||||
|
||||
(! nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in <foo>')
|
||||
nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in <foo>' -I src=.
|
||||
(! nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>')
|
||||
nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' -I src=.
|
||||
|
||||
p=$(nix eval --raw --expr "builtins.fetchurl file://$(pwd)/restricted.sh" --impure --restrict-eval --allowed-uris "file://$(pwd)")
|
||||
cmp $p restricted.sh
|
||||
|
|
|
|||
Loading…
Reference in a new issue