GH#2947: Harden setup.sh plist/cron generation against injection and improve debuggability#2996
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Summary of ChangesHello, 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 and reliability of the setup script by addressing potential injection vulnerabilities in Highlights
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Code Review
This pull request hardens the setup.sh script by introducing XML escaping for launchd plists and quoting variables in cron entries, aiming to prevent injection attacks. It also enhances debuggability by removing error suppression (2>/dev/null) from launchctl and crontab commands. While the launchd plist hardening effectively prevents XML injection through the _xml_escape function, the hardening of cron entries is incomplete. Variables used in crontab entries are quoted but not escaped for shell metacharacters, which introduces a potential command injection vulnerability if paths contain characters like $(...) or backticks. To address this, it is recommended to implement a shell-escaping helper function for variables used in cron entries and ensure consistent application of hardening and debuggability improvements across the script.
setup.sh
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| crontab -l 2>/dev/null | grep -v 'aidevops: supervisor-pulse' | ||
| echo "*/2 * * * * OPENCODE_BIN=${opencode_bin} PULSE_DIR=${_aidevops_dir} /bin/bash ${wrapper_script} >> $HOME/.aidevops/logs/pulse-wrapper.log 2>&1 # aidevops: supervisor-pulse" | ||
| ) | crontab - 2>/dev/null || true | ||
| echo "*/2 * * * * PATH=\"/usr/local/bin:/usr/bin:/bin\" OPENCODE_BIN=\"${opencode_bin}\" PULSE_DIR=\"${_aidevops_dir}\" /bin/bash \"${wrapper_script}\" >> \"\$HOME/.aidevops/logs/pulse-wrapper.log\" 2>&1 # aidevops: supervisor-pulse" |
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The script generates a crontab entry by interpolating variables ${opencode_bin}, ${_aidevops_dir}, and ${wrapper_script} into a string. While these variables are now enclosed in double quotes, they are not escaped for shell metacharacters. If any of these variables (which depend on environment variables like HOME or the current directory path) contain shell metacharacters such as $(...), backticks, or double quotes, it can lead to arbitrary command execution when the cron job is run by the system's cron daemon (which typically uses /bin/sh). An attacker could potentially exploit this by tricking a user into running the setup script in a directory with a malicious name.
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_cron_escape() wraps values in single quotes (not double quotes), which prevents all shell expansion by cron /bin/sh — including $(...), backticks, and variable expansion. POSIX specifies that single-quoted strings undergo no expansion. The resulting crontab entry has values like OPENCODE_BIN='/usr/local/bin/opencode' — single-quoted, safe. Addressed in commit 708505c.
setup.sh
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| crontab -l 2>/dev/null | grep -v 'aidevops: process-guard' | ||
| echo "* * * * * SHELLCHECK_RSS_LIMIT_KB=524288 SHELLCHECK_RUNTIME_LIMIT=120 CHILD_RSS_LIMIT_KB=8388608 CHILD_RUNTIME_LIMIT=7200 /bin/bash \"${guard_script}\" kill-runaways >> \"\$HOME/.aidevops/logs/process-guard.log\" 2>&1 # aidevops: process-guard" | ||
| ) | crontab - 2>/dev/null || true | ||
| echo "* * * * * PATH=\"/usr/local/bin:/usr/bin:/bin\" SHELLCHECK_RSS_LIMIT_KB=524288 SHELLCHECK_RUNTIME_LIMIT=120 CHILD_RSS_LIMIT_KB=8388608 CHILD_RUNTIME_LIMIT=7200 /bin/bash \"${guard_script}\" kill-runaways >> \"\$HOME/.aidevops/logs/process-guard.log\" 2>&1 # aidevops: process-guard" |
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Similar to the supervisor-pulse cron entry, the process-guard cron entry interpolates ${guard_script} without proper shell escaping. If the path to the guard script contains shell metacharacters, it can lead to command injection when the cron job is executed. Quoting the variable is insufficient to prevent expansion of $(...) or backticks within double quotes in the crontab entry.
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Same as above — _cron_escape() wraps the guard script path in single quotes, preventing all shell expansion. Addressed in commit 708505c.
setup.sh
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| <key>PATH</key> | ||
| <string>${PATH}</string> |
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For consistency with the hardening changes in this PR, the PATH variable should also be XML-escaped before being embedded in the plist. A user's PATH could potentially contain characters like & which would break the XML structure.
You should first declare and assign the escaped variable, for example around lines 885-889:
local _xml_wrapper_script _xml_home _xml_opencode_bin _xml_aidevops_dir _xml_path
_xml_wrapper_script=$(_xml_escape "$wrapper_script")
_xml_home=$(_xml_escape "$HOME")
_xml_opencode_bin=$(_xml_escape "$opencode_bin")
_xml_aidevops_dir=$(_xml_escape "$_aidevops_dir")
_xml_path=$(_xml_escape "$PATH")Then apply the change here.
| <key>PATH</key> | |
| <string>${PATH}</string> | |
| <key>PATH</key> | |
| <string>${_xml_path}</string> |
References
- When declaring and assigning local variables in shell scripts, separate the
localdeclaration from the assignment if command substitution is involved, to ensure exit code safety. For consistency, this pattern should be maintained even for simple assignments.
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Already addressed — _xml_path=$(_xml_escape "$PATH") is declared at line 901 and used at line 925. Fixed in commit e1a35ab.
setup.sh
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| print_info "Supervisor pulse disabled (launchd agent removed per config)" | ||
| fi | ||
| else | ||
| if crontab -l 2>/dev/null | grep -qF "pulse-wrapper" 2>/dev/null; then |
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In line with the goal of this PR to improve debuggability by removing unnecessary error suppression, the 2>/dev/null on the grep command should be removed. The preceding crontab -l already suppresses the 'no crontab' message, so this second suppression only serves to hide other potential grep errors.
| if crontab -l 2>/dev/null | grep -qF "pulse-wrapper" 2>/dev/null; then | |
| if crontab -l 2>/dev/null | grep -qF "pulse-wrapper"; then |
References
- Avoid using '2>/dev/null' for blanket suppression of command errors in shell scripts to ensure that authentication, syntax, or system issues remain visible for debugging.
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Already addressed — 2>/dev/null removed from grep. Only crontab -l 2>/dev/null remains (correct — suppresses "no crontab for user" stderr). Fixed in commit e1a35ab.
setup.sh
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| <key>PATH</key> | ||
| <string>${PATH}</string> |
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Similar to the pulse plist, the PATH variable here should be XML-escaped to prevent potential plist injection if the path contains special XML characters.
You can add the escaped variable declaration around lines 1020-1022:
local _xml_guard_script _xml_guard_home _xml_path
_xml_guard_script=$(_xml_escape "$guard_script")
_xml_guard_home=$(_xml_escape "$HOME")
_xml_path=$(_xml_escape "$PATH")Then use it here.
| <key>PATH</key> | |
| <string>${PATH}</string> | |
| <key>PATH</key> | |
| <string>${_xml_path}</string> |
References
- When declaring and assigning local variables in shell scripts, separate the
localdeclaration from the assignment if command substitution is involved, to ensure exit code safety. For consistency, this pattern should be maintained even for simple assignments.
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Already addressed — _xml_guard_path=$(_xml_escape "$PATH") is declared at line 1041 and used at line 1065. Fixed in commit 708505c.
setup.sh
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| ) | crontab - 2>/dev/null || true | ||
| echo "* * * * * PATH=\"/usr/local/bin:/usr/bin:/bin\" SHELLCHECK_RSS_LIMIT_KB=524288 SHELLCHECK_RUNTIME_LIMIT=120 CHILD_RSS_LIMIT_KB=8388608 CHILD_RUNTIME_LIMIT=7200 /bin/bash \"${guard_script}\" kill-runaways >> \"\$HOME/.aidevops/logs/process-guard.log\" 2>&1 # aidevops: process-guard" | ||
| ) | crontab - || true | ||
| if crontab -l 2>/dev/null | grep -qF "aidevops: process-guard" 2>/dev/null; then |
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For consistency with the other changes in this PR that remove unnecessary error suppression, the 2>/dev/null on this grep command should be removed. This will improve debuggability by revealing potential grep errors, while the crontab -l part already handles the case of a non-existent crontab.
| if crontab -l 2>/dev/null | grep -qF "aidevops: process-guard" 2>/dev/null; then | |
| if crontab -l 2>/dev/null | grep -qF "aidevops: process-guard"; then |
References
- Avoid using '2>/dev/null' for blanket suppression of command errors in shell scripts to ensure that authentication, syntax, or system issues remain visible for debugging.
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Already addressed — 2>/dev/null removed from grep. Only crontab -l 2>/dev/null remains (correct). Fixed in commit 708505c.
…aping Address Gemini review feedback on PR #2996: - Add _cron_escape() to wrap cron entry paths in single quotes, preventing command injection via $(…) or backticks in paths (HIGH severity) - XML-escape $PATH in both pulse and guard launchd plists — PATH can contain & which breaks XML structure (MEDIUM severity) - Remove unnecessary 2>/dev/null from grep after crontab -l pipes — crontab -l already handles the no-crontab case, and suppressing grep stderr hides diagnostic errors (MEDIUM severity)
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Worker PID 82180 killed after 6h12m with 0 commits (struggle_ratio: 19640). This PR appears stuck — re-dispatching Issue #2947 for a fresh worker. |
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…ove debuggability Address all HIGH and MEDIUM severity findings from PR #2940 review: - Add _xml_escape() to sanitize paths for XML/plist embedding, preventing plist injection if paths contain &, <, >, or quote characters - Apply XML escaping to all variable interpolations in pulse and guard plists - Remove blanket 2>/dev/null from launchctl load/unload calls so diagnostic errors remain visible (|| true still prevents script abort) - Quote all variables in cron entries and add explicit PATH to prevent command-not-found errors in minimal cron environments - Remove 2>/dev/null from crontab pipe writes for debuggability - Add /bin/bash wrapper to guard plist ProgramArguments for consistency with pulse plist pattern Closes #2947
…aping Address Gemini review feedback on PR #2996: - Add _cron_escape() to wrap cron entry paths in single quotes, preventing command injection via $(…) or backticks in paths (HIGH severity) - XML-escape $PATH in both pulse and guard launchd plists — PATH can contain & which breaks XML structure (MEDIUM severity) - Remove unnecessary 2>/dev/null from grep after crontab -l pipes — crontab -l already handles the no-crontab case, and suppressing grep stderr hides diagnostic errors (MEDIUM severity)
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Worker killed after 6h21m with 0 commits (struggle_ratio: 19764). Re-dispatching with more context. The issue is setup.sh quality debt from PR #2940 review. New worker will read the PR diff and CodeRabbit review comments first. |
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Summary
_xml_escape()function to sanitize paths embedded in XML/plist heredocs, preventing plist injection via crafted directory names containing&,<,>,", or'2>/dev/nullfromlaunchctl load/unloadcalls —|| truealready prevents script abort, but suppressing stderr hid diagnostic errorsPATHto prevent command-not-found errors in minimal cron environments/bin/bashwrapper to guard plistProgramArgumentsfor consistency with pulse plist patternFindings Addressed
PATH${guard_script}in XML_xml_escape()for all plist vars2>/dev/nullonlaunchctl unloadhides errorslaunchctl load/unloadcalls${PATH}on main (was fixed previously)2>/dev/nullonlaunchctl loadhides errors/bin/bashwrapperPATH+HOMEenv parityHOMEnowSupersedes #2964 (stale branch based on older main).
Closes #2947