🛡️ Sentinel: Fix shell scripting vulnerabilities in entrypoint.sh#34
🛡️ Sentinel: Fix shell scripting vulnerabilities in entrypoint.sh#34
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- Quote variables in `adduser` calls to prevent globbing and word splitting - Use `printf " %s"` to prevent format string injection - Add `-r` to `read` command to preserve backslashes in passwords - Quote variables in status messages Co-authored-by: bluPhy <11618798+bluPhy@users.noreply.github.com>
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Summary of ChangesHello @bluPhy, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the security posture of the Highlights
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WalkthroughShell script entrypoint improvements focused on robustness and proper quoting practices. Changes include fixing echo statement quoting, using printf format specifiers, adding read -r flag for backslash handling, and quoting user arguments to prevent word-splitting issues. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~8 minutes Poem
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Code Review
This pull request effectively hardens the copyables/entrypoint.sh script against several common shell scripting vulnerabilities. The changes correctly address format string injection, globbing/word splitting issues, and input integrity problems by using printf with a format string, quoting variables, and using the -r option with read. The fixes are well-implemented and significantly improve the script's security and robustness. I've added a couple of suggestions to further improve robustness by replacing echo with printf for printing variable data, which is a safer practice.
| else | ||
| : ${USERNAME:=user$(cat /dev/urandom | tr -dc '0-9' | fold -w 4 | head -n 1)} | ||
| echo \# ${USERNAME} | ||
| echo "# ${USERNAME}" |
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While echo "# ${USERNAME}" is an improvement that prevents globbing, it's generally safer to use printf to avoid potential issues with arguments that could be interpreted as options by echo (like -n). Although the string here starts with #, which mitigates the risk with many echo implementations, using printf is a more robust and portable way to print variable data, especially when that data can be user-supplied via environment variables.
| echo "# ${USERNAME}" | |
| printf "# %s\n" "${USERNAME}" |
| else | ||
| PASSWORD=$(cat /dev/urandom | tr -dc '0-9' | fold -w 20 | head -n 1 | sed 's/.\{4\}/&./g;s/.$//;') | ||
| echo \# ${PASSWORD} | ||
| echo "# ${PASSWORD}" |
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Similar to the suggestion for line 40, using printf is a more robust and portable way to print variable content. It avoids potential pitfalls of echo when handling data that might start with a hyphen, which is a good practice when the variable can be set from an external source like an environment variable.
| echo "# ${PASSWORD}" | |
| printf "# %s\n" "${PASSWORD}" |
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Hardened
copyables/entrypoint.shagainst several shell scripting vulnerabilities:printf " $1"toprintf " %s" "$1"inadduserfunction.$usernameand$passwordvariables inaddusercalls. This prevents passwords containing*or spaces from being mishandled.-rflag toreadcommand to prevent backslashes from being interpreted as escape characters.echostatements to prevent accidental globbing of sensitive values.PR created automatically by Jules for task 2210651823306672991 started by @bluPhy
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