🛡️ Sentinel: Fix shell injection and password truncation in entrypoint

[google-labs-jules]

🛡️ Sentinel Security Fix

Vulnerability:

• Unquoted variables in copyables/entrypoint.sh allowed word splitting (truncating passwords with spaces) and glob expansion (unexpectedly expanding * to file lists in commands).
• read without -r stripped backslashes from passwords.
• A logic bug in command processing loop caused only the first command to be executed.

Fix:

• Applied read -r and strict variable quoting ("$VAR") for user/password handling.
• Implemented set -f (noglob) pattern for VPNCMD_SERVER execution to safely allow argument splitting without globbing.
• Refactored command loop to correctly iterate over all commands.

Verification:

• Added tests/verify_password_fix.sh which confirms:
  • Passwords with spaces are preserved.
  • Backslashes are preserved.
  • Glob characters (*) are passed literally.
  • Commands with multiple arguments are parsed correctly.
• Ran bash -n to ensure syntax correctness.

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PR created automatically by Jules for task 14380228469637421199 started by @bluPhy

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