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Restore 'forbidden in restricted mode' errors

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This commit is contained in:
Eelco Dolstra 2025-04-01 20:46:26 +02:00
parent 1564c8f9d9
commit 4e0346dcc1
2 changed files with 13 additions and 3 deletions
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10
src/libexpr/eval.cc
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@ -3073,6 +3073,11 @@ SourcePath EvalState::findFile(const LookupPath & lookupPath, const std::string_
auto res = (r / CanonPath(suffix)).resolveSymlinks(); auto res = (r / CanonPath(suffix)).resolveSymlinks();
if (res.pathExists()) return res; if (res.pathExists()) return res;
// Backward compatibility hack: throw an exception if access
// to this path is not allowed.
if (auto accessor = res.accessor.dynamic_pointer_cast<FilteringSourceAccessor>())
accessor->checkAccess(res.path);
} }
if (hasPrefix(path, "nix/")) if (hasPrefix(path, "nix/"))
@ -3143,6 +3148,11 @@ std::optional<SourcePath> EvalState::resolveLookupPathPath(const LookupPath::Pat
if (path.resolveSymlinks().pathExists()) if (path.resolveSymlinks().pathExists())
return finish(std::move(path)); return finish(std::move(path));
else { else {
// Backward compatibility hack: throw an exception if access
// to this path is not allowed.
if (auto accessor = path.accessor.dynamic_pointer_cast<FilteringSourceAccessor>())
accessor->checkAccess(path.path);
logWarning({ logWarning({
.msg = HintFmt("Nix search path entry '%1%' does not exist, ignoring", value) .msg = HintFmt("Nix search path entry '%1%' does not exist, ignoring", value)
}); });

6
tests/functional/restricted.sh
View file

@ -23,7 +23,7 @@ nix-instantiate --restrict-eval ./simple.nix -I src1=./simple.nix -I src2=./conf
(! nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix') (! nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix')
nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix' -I src=../.. nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix' -I src=../..
expectStderr 1 nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' #| grepQuiet "forbidden in restricted mode" expectStderr 1 nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' | grepQuiet "forbidden in restricted mode"
nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' -I src=. nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' -I src=.
p=$(nix eval --raw --expr "builtins.fetchurl file://${_NIX_TEST_SOURCE_DIR}/restricted.sh" --impure --restrict-eval --allowed-uris "file://${_NIX_TEST_SOURCE_DIR}") p=$(nix eval --raw --expr "builtins.fetchurl file://${_NIX_TEST_SOURCE_DIR}/restricted.sh" --impure --restrict-eval --allowed-uris "file://${_NIX_TEST_SOURCE_DIR}")
@ -53,9 +53,9 @@ mkdir -p $TEST_ROOT/tunnel.d $TEST_ROOT/foo2
ln -sfn .. $TEST_ROOT/tunnel.d/tunnel ln -sfn .. $TEST_ROOT/tunnel.d/tunnel
echo foo > $TEST_ROOT/bar echo foo > $TEST_ROOT/bar
expectStderr 1 nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readFile <foo/tunnel/bar>" -I $TEST_ROOT/tunnel.d #| grepQuiet "forbidden in restricted mode" expectStderr 1 nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readFile <foo/tunnel/bar>" -I $TEST_ROOT/tunnel.d | grepQuiet "forbidden in restricted mode"
expectStderr 1 nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readDir <foo/tunnel/foo2>" -I $TEST_ROOT/tunnel.d #| grepQuiet "forbidden in restricted mode" expectStderr 1 nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readDir <foo/tunnel/foo2>" -I $TEST_ROOT/tunnel.d | grepQuiet "forbidden in restricted mode"
# Reading the parents of allowed paths should show only the ancestors of the allowed paths. # Reading the parents of allowed paths should show only the ancestors of the allowed paths.
[[ $(nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readDir <foo/tunnel>" -I $TEST_ROOT/tunnel.d) == '{ "tunnel.d" = "directory"; }' ]] [[ $(nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readDir <foo/tunnel>" -I $TEST_ROOT/tunnel.d) == '{ "tunnel.d" = "directory"; }' ]]