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fix(permission-hardener): ssh-agent gets 2755 perms

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Change from exactwhitelist to matchwhitelist. Discussion revealed that
there's a good reason to leave setgid in here, which is essentially
defense-in-depth (sometimes users may want to revert Kicksecure's
default of kernel.yama.ptrace_scope=2, e.g. to debug a program, and
Kicksecure should not be less secure than vanilla Debian in that
situation).
This commit is contained in:
Ashlen 2025-05-27 15:32:41 -06:00
parent c59b2e4bc5
commit 3559bc86b7
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1 changed files with 3 additions and 8 deletions
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11
usr/lib/permission-hardener.d/25_default_whitelist_ssh.conf
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@ -8,14 +8,9 @@
## Used for SSH client key management
## https://manpages.debian.org/bookworm/openssh-client/ssh-agent.1.en.html
## Debian installs ssh-agent with setgid permissions (2755) and with
## _ssh as the group to prevent ptrace attacks that could extract
## private keys from the agent's memory. However, as Kicksecure makes use
## of kernel.yama.ptrace_scope=2 by default, this is not a concern.
##
## ssh-agent is often run under non-root users, so 755 permissions make
## sense here to avoid breakage.
/usr/bin/ssh-agent exactwhitelist
/usr/bin/ssh-agent 755 root root
## _ssh as the group to help mitigate ptrace attacks that could extract
## private keys from the agent's memory.
ssh-agent matchwhitelist
## Used only for SSH host-based authentication
## https://linux.die.net/man/8/ssh-keysign