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Merge pull request #10482 from tweag/fix-symlink-in-sandbox

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Fix the access of symlinks to host files in the sandbox
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John Ericson 2024-04-15 09:29:00 -04:00 committed by GitHub
commit 65cc237b3a
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3 changed files with 65 additions and 20 deletions
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13
src/libstore/build/local-derivation-goal.cc
View file

@ -1823,11 +1823,18 @@ void LocalDerivationGoal::runChild()
if (pathExists(path))
ss.push_back(path);
if (settings.caFile != "")
pathsInChroot.try_emplace("/etc/ssl/certs/ca-certificates.crt", settings.caFile, true);
if (settings.caFile != "" && pathExists(settings.caFile)) {
Path caFile = settings.caFile;
pathsInChroot.try_emplace("/etc/ssl/certs/ca-certificates.crt", canonPath(caFile, true), true);
}
}
for (auto & i : ss) pathsInChroot.emplace(i, i);
for (auto & i : ss) {
// For backwards-compatibiliy, resolve all the symlinks in the
// chroot paths
auto canonicalPath = canonPath(i, true);
pathsInChroot.emplace(i, canonicalPath);
}
/* Bind-mount all the directories from the "host"
filesystem that we want in the chroot

17
tests/functional/linux-sandbox.sh
View file

@ -60,7 +60,13 @@ testCert () {
nocert=$TEST_ROOT/no-cert-file.pem
cert=$TEST_ROOT/some-cert-file.pem
symlinkcert=$TEST_ROOT/symlink-cert-file.pem
transitivesymlinkcert=$TEST_ROOT/transitive-symlink-cert-file.pem
symlinkDir=$TEST_ROOT/symlink-dir
echo -n "CERT_CONTENT" > $cert
ln -s $cert $symlinkcert
ln -s $symlinkcert $transitivesymlinkcert
ln -s $TEST_ROOT $symlinkDir
# No cert in sandbox when not a fixed-output derivation
testCert missing normal "$cert"
@ -74,5 +80,14 @@ testCert missing fixed-output "$nocert"
# Cert in sandbox when ssl-cert-file is set to an existing file
testCert present fixed-output "$cert"
# Cert in sandbox when ssl-cert-file is set to a (potentially transitive) symlink to an existing file
testCert present fixed-output "$symlinkcert"
testCert present fixed-output "$transitivesymlinkcert"
# Symlinks should be added in the sandbox directly and not followed
nix-sandbox-build symlink-derivation.nix
nix-sandbox-build symlink-derivation.nix -A depends_on_symlink
nix-sandbox-build symlink-derivation.nix -A test_sandbox_paths \
--option extra-sandbox-paths "/file=$cert" \
--option extra-sandbox-paths "/dir=$TEST_ROOT" \
--option extra-sandbox-paths "/symlinkDir=$symlinkDir" \
--option extra-sandbox-paths "/symlink=$symlinkcert"

55
tests/functional/symlink-derivation.nix
View file

@ -15,22 +15,45 @@ let
'';
};
in
mkDerivation {
name = "depends-on-symlink";
buildCommand = ''
(
set -x
{
depends_on_symlink = mkDerivation {
name = "depends-on-symlink";
buildCommand = ''
(
set -x
# `foo_symlink` should be a symlink pointing to `foo_in_store`
[[ -L ${foo_symlink} ]]
[[ $(readlink ${foo_symlink}) == ${foo_in_store} ]]
# `foo_symlink` should be a symlink pointing to `foo_in_store`
[[ -L ${foo_symlink} ]]
[[ $(readlink ${foo_symlink}) == ${foo_in_store} ]]
# `symlink_to_not_in_store` should be a symlink pointing to `./.`, which
# is not available in the sandbox
[[ -L ${symlink_to_not_in_store} ]]
[[ $(readlink ${symlink_to_not_in_store}) == ${builtins.toString ./.} ]]
(! ls ${symlink_to_not_in_store}/)
)
echo "Success!" > $out
'';
# `symlink_to_not_in_store` should be a symlink pointing to `./.`, which
# is not available in the sandbox
[[ -L ${symlink_to_not_in_store} ]]
[[ $(readlink ${symlink_to_not_in_store}) == ${builtins.toString ./.} ]]
(! ls ${symlink_to_not_in_store}/)
# Native paths
)
echo "Success!" > $out
'';
};
test_sandbox_paths = mkDerivation {
# Depends on the caller to set a bunch of `--sandbox-path` arguments
name = "test-sandbox-paths";
buildCommand = ''
(
set -x
[[ -f /file ]]
[[ -d /dir ]]
# /symlink and /symlinkDir should be available as raw symlinks
# (pointing to files outside of the sandbox)
[[ -L /symlink ]] && [[ ! -e $(readlink /symlink) ]]
[[ -L /symlinkDir ]] && [[ ! -e $(readlink /symlinkDir) ]]
)
touch $out
'';
};
}