test: include strace openat test#46150

RafaelGSS · 2023-01-09T20:37:13Z

Signed-off-by: RafaelGSS [email protected]

Opening it for early feedback. We need to find a way to do it cross-platform, either with other files (openat-linux-syscall, openat-osx-syscall, openat-windows-syscall) or with some magic cross-platform tool.

The idea is to address nodejs/security-wg#827. The CVE-2022-32222 is an example of the purpose of this test.

cc: @nodejs/security-wg @mhdawson

test/parallel/test-strace-openat-openssl.js

addaleax · 2023-01-09T21:13:09Z

test/parallel/test-strace-openat-openssl.js

+
+ const file = line.match(/"(.*?)"/)[1];
+ // skip .so reading attempt
+ if (file.match(/.+\.so(\.?)/) !== null){


It might actually not be that bad to assert these as well – if we added a new .so dependency on Linux, we might want to know about that?

In my case, it's reading the .so from shared locations, for instance: "/home/rafaelgss/.gvm/pkgsets/go1.15/global/overlay/lib/libpthread.so.0". How would we handle it?

You could assert just the filename, ignoring the rest of the path, right?

I'm not sure. That CVE mentioned in the PR description is really about it. Reading a file/library from an unexpected path.

Yeah, please don’t consider this a blocking comment. This would test something different, that’s true, but it does seem valuable to test it regardless.

test/parallel/test-strace-openat-openssl.js

t.js

bnoordhuis · 2023-01-10T19:16:59Z

AssertionError [ERR_ASSERTION]: /proc/self/cmdline is not in the list of allowed openat calls

I don't think you're going to be able to avoid this. Different versions of glibc open different files, to say nothing of other libcs.

If you want to go fancy, you could wait until right before the child process does require('crypto') and attach with strace -p <pid>; will involve syncing over an IPC channel.

Another issue you or someone else inevitably is going to run into is that strace won't work on locked down systems (sysctl kernel.yama.ptrace_scope > 1)

RafaelGSS · 2023-01-13T03:28:04Z

I don't think you're going to be able to avoid this. Different versions of glibc open different files, to say nothing of other libcs.

What about skipping /proc/* fd?

Another issue you or someone else inevitably is going to run into is that strace won't work on locked down systems (sysctl kernel.yama.ptrace_scope > 1)

Well, we can also run it only on CI, so I assume it will work all the time.

bnoordhuis · 2023-01-13T14:15:32Z

What about skipping /proc/* fd?

That won't be enough. glibc can for any number of reasons decide to open files in /etc, /proc, /sys, /lib, etc.

RafaelGSS · 2023-01-21T04:15:52Z

Requesting CI just to see how many use cases I would need to cover. Another viable option would be just logging it before publishing a release, however, it would require an extra step for a releaser, which is, definitely something I don't want.

nodejs-github-bot · 2023-01-21T04:20:08Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49114/

RafaelGSS · 2023-01-30T23:56:23Z

What about skipping /proc/* fd?
That won't be enough. glibc can for any number of reasons decide to open files in /etc, /proc, /sys, /lib, etc.

Wouldn't it be consistent in the CI machine at least? Well, I think we won't have a better way to pursue this work, right?

nodejs-github-bot · 2023-01-31T00:23:21Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49268/

Signed-off-by: RafaelGSS <[email protected]>

nodejs-github-bot · 2023-02-06T12:59:46Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49433/

nodejs-github-bot · 2023-02-06T15:19:46Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49447/

RafaelGSS · 2023-02-07T14:12:08Z

@bnoordhuis It seems to be fixed (considering we are skipping the test in a few situations), but based on your comment looks like we should also skip it when it's not running in the CI.

Do you think it will be flaky somehow?

nodejs-github-bot · 2023-02-22T19:08:37Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49890/

nodejs-github-bot · 2023-02-23T19:17:28Z

Landed in 86362b7

Signed-off-by: RafaelGSS <[email protected]> PR-URL: #46150 Reviewed-By: Michael Dawson <[email protected]>

nodejs/node#46150

* chore: bump node in DEPS to v18.16.0 * build,test: add proper support for IBM i nodejs/node#46739 * lib: enforce use of trailing commas nodejs/node#46881 * src: add initial support for single executable applications nodejs/node#45038 * lib: do not crash using workers with disabled shared array buffers nodejs/node#41023 * src: remove shadowed variable in OptionsParser::Parse nodejs/node#46672 * src: allow embedder control of code generation policy nodejs/node#46368 * src: allow optional Isolate termination in node::Stop() nodejs/node#46583 * lib: fix BroadcastChannel initialization location nodejs/node#46864 * chore: fixup patch indices * chore: sync filenames.json * fix: add simdutf dep to src/inspector BUILD.gn - nodejs/node#46471 - nodejs/node#46472 * deps: replace url parser with Ada nodejs/node#46410 * tls: support automatic DHE nodejs/node#46978 * fixup! src: add initial support for single executable applications * http: unify header treatment nodejs/node#46528 * fix: libc++ buffer overflow in string_view ctor nodejs/node#46410 * test: include strace openat test nodejs/node#46150 * fixup! fixup! src: add initial support for single executable applications --------- Co-authored-by: electron-roller[bot] <84116207+electron-roller[bot]@users.noreply.github.com> Co-authored-by: Shelley Vohr <[email protected]>

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