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PosixSourceAccessor: Don't follow any symlinks

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All path components must not be symlinks now (so the user needs to
call `resolveSymlinks()` when needed).
This commit is contained in:
Eelco Dolstra 2023-12-05 23:02:59 +01:00
parent 345f79d016
commit 83c067c0fa
7 changed files with 58 additions and 30 deletions
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7
tests/functional/restricted.sh
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@ -40,13 +40,16 @@ nix-instantiate --eval --restrict-eval $TEST_ROOT/restricted.nix -I $TEST_ROOT -
[[ $(nix eval --raw --impure --restrict-eval -I . --expr 'builtins.readFile "${import ./simple.nix}/hello"') == 'Hello World!' ]]
# Check that we can't follow a symlink outside of the allowed paths.
mkdir -p $TEST_ROOT/tunnel.d
mkdir -p $TEST_ROOT/tunnel.d $TEST_ROOT/foo2
ln -sfn .. $TEST_ROOT/tunnel.d/tunnel
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.readDir <foo/tunnel>" -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.
[[ $(nix-instantiate --restrict-eval --eval -E "let __nixPath = [ { prefix = \"foo\"; path = $TEST_ROOT/tunnel.d; } ]; in builtins.readDir <foo/tunnel>" -I $TEST_ROOT/tunnel.d) == '{ "tunnel.d" = "directory"; }' ]]
# Check whether we can leak symlink information through directory traversal.
traverseDir="$(pwd)/restricted-traverse-me"