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Downloader: Log configured CA file #3141

Merged
merged 1 commit into from
Nov 26, 2019
Merged

Downloader: Log configured CA file #3141

merged 1 commit into from
Nov 26, 2019
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xbreak
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@xbreak xbreak commented Oct 12, 2019 •
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Update: Rescoped PR to only debug print configured CA file to address concerns by @edolstra.

It seems like a good idea to warn if no trusted CA's has been configured, to help narrow down issues like NixOS/nixpkgs#70939.

Update: CA files may come from different sources if e.g. Curl or the TLS library is used from the system and not Nix. Therefore it might be misleading to warn.

In addition I added a debug print of the configured CA file for the same reason.

Tested on CentOS and looks like this:

$ nix-env -i firefox -vvv
...
downloading 'https://cache.nixos.org/nar/0wpvc57l0sv8jxfylfyfwrkxzij6fxvakk4k3zd11iiaanwx8viy.nar.xz'...
starting download of https://cache.nixos.org/nar/0wpvc57l0sv8jxfylfyfwrkxzij6fxvakk4k3zd11iiaanwx8viy.nar.xz
verify TLS: Nix CA file = ''
finished download of 'https://cache.nixos.org/nar/0wpvc57l0sv8jxfylfyfwrkxzij6fxvakk4k3zd11iiaanwx8viy.nar.xz'; curl status = 60, HTTP status = 0, body = 0 bytes
warning: unable to download 'https://cache.nixos.org/nar/0wpvc57l0sv8jxfylfyfwrkxzij6fxvakk4k3zd11iiaanwx8viy.nar.xz': SSL peer certificate or SSH remote key was not OK (60); retrying in 274 ms

zimbatm
zimbatm reviewed Oct 14, 2019
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I'm not sure about this. If libcurl is a native (non-Nix) package or if it's using some native TLS mechanism (I think this is the case on macOS), then it may be able to find certificates even if settings.caFile is unset.

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xbreak commented Oct 14, 2019

I'm not sure about this. If libcurl is a native (non-Nix) package or if it's using some native TLS mechanism (I think this is the case on macOS), then it may be able to find certificates even if settings.caFile is unset.

Any suggestions on how to improve the PR? It e.g. sounds like it wouldn't be useful to read out paths from curl either, since other paths that are unknown to curl might be used as well, depending on the TLS library.

Maybe just keep the debug log then (and rephrase to indicate that the CA file is provided by Nix: "verify TLS: Nix CA file = '%s'")?

@xbreak xbreak mentioned this pull request Oct 17, 2019
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@xbreak xbreak changed the title Downloader: Warn if no trusted CA file has been configured Downloader: Log configure CA file Oct 18, 2019
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xbreak commented Oct 18, 2019

I updated PR to only debug log the Nix configured CA file. Hope this addresses your concern @edolstra .

@xbreak xbreak changed the title Downloader: Log configure CA file Downloader: Log configured CA file Oct 18, 2019
@edolstra edolstra merged commit 4259918 into NixOS:master Nov 26, 2019
@xbreak xbreak deleted the nocafile branch December 10, 2019 13:29
@ldesgoui ldesgoui mentioned this pull request Aug 1, 2021
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