poetry.lock hashes not checked when running poetry install

[slai]

• [x] I am on the latest Poetry version.

• [x] I have searched the issues of this repo and believe that this is not a duplicate.

• [ ] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu Bionic (within Docker)

• Poetry version: 1.0.5

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/slai/9d0d442fe7e4f4ea04e8f658b675192a#file-poetry_no_hash_check-dockerfile-L22-L33

Issue

It appears that Poetry does not check the hashes of the packages in poetry.lock when installing packages using poetry install.

The Dockerfile in this gist (https://gist.github.com/slai/9d0d442fe7e4f4ea04e8f658b675192a) demonstrates the issue. It runs poetry lock, mangles the hashes in poetry.lock, then runs poetry install. This succeeds, with no errors.

I would expect poetry install to fail in this case, or at least print a warning for packages where the hash does not match.

[signed8bit]

It's a bit concerning that this issue has been open for nearly a year now. Is this something the core team is looking to address?

[FlorianLudwig]

It doesn't seem so. I opened a new MR here: https://github.com/python-poetry/poetry-core/pull/113

Since the code moved into a different repo.

[signed8bit]

Thanks for the pointer @FlorianLudwig!

[pietrodn]

List of PRs related to this issue:

• https://github.com/python-poetry/poetry-core/pull/113 (needs a rebase)
• https://github.com/python-poetry/poetry-core/pull/159
• https://github.com/python-poetry/poetry/pull/3885
• https://github.com/python-poetry/poetry/pull/3423
• https://github.com/python-poetry/poetry/pull/3301 (needs a rebase)
• https://github.com/python-poetry/poetry/pull/2611 (needs a rebase)

Can we merge one of the valid ones? Not checking the hashes in poetry.lock poses a significant security problem.

[pietrodn]

In particular python-poetry/poetry-core#159 + #3885 are meant to be fixed together from what I understand. The other PRs can be closed.

[remram44]

I recommend we don't close anything until we manage to catch the eye of a maintainer. It looks like if anything we should make more noise about this.

[cburgess]

I very much agree we need to get something merged and released to address this. With recent supply chain attacks in the media, a number of enterprises are launching efforts to harden their build and release processes and hash checking is one of the key features they are looking for, an assume poetry provides.

[myoung34]

Anything upcoming soon?

As per our security requirements its hard to justify losing hashes or shimming our poetry.lock to requirements.txt to keep them

[waitsfornone]

I am wanting to move to Poetry in production, but I would prefer to have hash checking before I do so. With global Data protection laws being stricter, I need to know that I am not vulnerable through my dependency management.

[rabadin]

Same here, this issue is the one big blocker that is preventing us from adopting poetry as our standard to manage Python projects.

[JonZeolla]

This issue was the primary reason why my company standardized on pipenv instead.

[dpippenger]

A CVE should be filed for this issue as it presents a supply chain attack vector that puts any poetry user relying on hash validations at risk of compromise.

[finswimmer]

Hello everyone,

unfortunately my knowledge about this part of code of poetry is to limited to review the existing PRs. I can see that this issue is serious for many people, so I pinged @sdispater and @abn directly to have a look on it.

fin swimmer

[pietrodn]

I confirm that with the latest master version the issue is solved (I tried to change the hashes in poetry.lock and the installation errored). Thank you! 🚀

[fredrikaverpil]

I suspect this was not released in a formal release yet. It would be really good if we can have this included the next time a release is being cut. @finswimmer @abn @sdispater do you intend to include this in a 1.1.x release?

[pietrodn]

This fix is not yet included in the latest bugfix release (1.1.7). It would be great if it was included in the next one, as it's an important security issue.

[pietrodn]

I made a PR to backport this fix to Poetry 1.1: https://github.com/python-poetry/poetry/pull/4420

[slai]

I've just tested this using the gist in the description and the newly released poetry 1.1.9, and can confirm poetry install fails if the hashes do not match those in poetry.lock.

> poetry install --ansi

 Installing dependencies from lock file

 Package operations: 1 install, 0 updates, 0 removals

   • Installing chardet (3.0.4): Failed

   RuntimeError

   Retrieved digest for link chardet-3.0.4.tar.gz(sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae) not in poetry.lock metadata ['sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef', 'sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef']

   at ~/.poetry/lib/poetry/installation/chooser.py:115 in _get_links
       111│
       112│         if links and not selected_links:
       113│             raise RuntimeError(
       114│                 "Retrieved digest for link {}({}) not in poetry.lock metadata {}".format(
     → 115│                     link.filename, h, hashes
       116│                 )
       117│             )
       118│
       119│         return selected_links

Thanks @pietrodn @sdispater and everyone else involved!

[fredrikaverpil]

I haven't tested this yet but huge thanks for everyone involved in this! 🎉

[jowparks]

This hash system is broken for me, we have an internal pypi repo and the one package we have installed from there, we the poetry.lock is outputting a md5 hash when I run poetry install and regenerate the lock file:

snowflake-rdp-broker = [
    {file = "snowflake-rdp-broker-1.5.9.tar.gz", hash = "md5:fa3d9fc394bd06488e07a54fc788b1db"},
]

Then when I try to run poetry install, I get:

  Invalid hash for snowflake-rdp-broker (1.5.9) using archive snowflake-rdp-broker-1.5.9.tar.gz

  at /usr/local/lib/python3.9/site-packages/poetry/installation/executor.py:613 in _download_link
      609│ 
      610│         if package.files:
      611│             archive_hash = "sha256:" + FileDependency(package.name, archive).hash()
      612│             if archive_hash not in {f["hash"] for f in package.files}:
    → 613│                 raise RuntimeError(
      614│                     "Invalid hash for {} using archive {}".format(package, archive.name)
      615│                 )
      616│ 
      617│         return archive

[remram44]

@jowparks Do you have to use md5 instead of sha256? Is that even supported by pip?

In any case, this seems unrelated to this (closed) issue.

[jowparks]

@jowparks Do you have to use md5 instead of sha256? Is that even supported by pip?

In any case, this seems unrelated to this (closed) issue.

I don't do anything special for that package, I am fine with using sha256 and in fact the nexus pypi repo lists all the different hashes in the UI.

The relevant sections of the pyproject.toml are:

[[tool.poetry.source]]
name = "private-pypi"
url = "https://nexus.ourdomain.net/repository/invitae-pypi/simple/"

[tool.poetry.dependencies]
snowflake_rdp_broker = "*"

then we just run

pip install poetry && poetry install

which fails. This succeeds:

pip install poetry==1.0.10 && poetry install

Also I will note that all the other dependencies (which are from public pypi) have sha256 hashes in the generatedpoetry.lock, only the internal pypi is getting an md5 hash, I have no idea why 🤷

[remram44]

This seems to be #4523

[github-actions[bot]]

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