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Accessing shadow records via varlink (asg2025)

3d ago 26:12

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Provide a varlink service to access /etc/passwd and /etc/shadow so that no setuid and setgid binaries are necessary for this task. There are two independent "problems" which can be solved with the same idea: all files in /usr should be owned by root:root and no setuid binary should be needed. The first one is a requirement of image based updates of /usr to avoid UID/GID drift, the second one is a security feature wished by systemd developers and security teams. Currently most setuid binaries (or setgid binaries owned by group shadow) beside su and sudo only need this to read the shadow entry of the calling user. This task could be delegated to a systemd socket activated service which provides the user shadow entry for the calling user. In this talk I will present the why, the current implementation and feedback from security teams. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/RUTE9Y/

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2013 episodes

#Tech #Ccc Congress Hacking Security Netzpolitik #Germany #CCC media team #Video

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Accessing shadow records via varlink (asg2025)

Chaos Computer Club - recent events feed (high quality)

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published 3d ago

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MP4•Episode home

Content provided by CCC media team. All podcast content including episodes, graphics, and podcast descriptions are uploaded and provided directly by CCC media team or their podcast platform partner. If you believe someone is using your copyrighted work without your permission, you can follow the process outlined here https://podcastplayer.com/legal.

Provide a varlink service to access /etc/passwd and /etc/shadow so that no setuid and setgid binaries are necessary for this task. There are two independent "problems" which can be solved with the same idea: all files in /usr should be owned by root:root and no setuid binary should be needed. The first one is a requirement of image based updates of /usr to avoid UID/GID drift, the second one is a security feature wished by systemd developers and security teams. Currently most setuid binaries (or setgid binaries owned by group shadow) beside su and sudo only need this to read the shadow entry of the calling user. This task could be delegated to a systemd socket activated service which provides the user shadow entry for the calling user. In this talk I will present the why, the current implementation and feedback from security teams. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/RUTE9Y/

… continue reading

2013 episodes

#Tech #Ccc Congress Hacking Security Netzpolitik #Germany #CCC media team #Video

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