🛡️ Sentinel: [HIGH] Fix shell injection and unquoted variables#39
🛡️ Sentinel: [HIGH] Fix shell injection and unquoted variables#39
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- Quote all variable expansions to prevent word splitting and globbing - Use `read -r` to prevent backslash interpretation - Fix `printf` usage to avoid format string injection - Fix binary paths in `gencert.sh` to match Dockerfile installation (/usr/local/bin) Co-authored-by: bluPhy <11618798+bluPhy@users.noreply.github.com>
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WalkthroughThis pull request addresses shell script injection risks through security documentation and code hardening. It introduces a vulnerability guide at Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Poem
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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 addresses a critical high-severity shell injection vulnerability within the Highlights
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Code Review
This pull request effectively addresses critical shell injection vulnerabilities by consistently quoting variables and using read -r in entrypoint.sh, which significantly enhances script security and updates paths in gencert.sh. While these changes prevent argument splitting and glob expansion, a regression has been introduced in the fix for processing custom VPN commands via the VPNCMD_SERVER and VPNCMD_HUB environment variables. This flaw causes only the first command in a list to be processed and fails if that command contains arguments, potentially preventing users from applying necessary security configurations.
| while IFS=";" read -r -a CMD; do | ||
| vpncmd_server "$CMD" | ||
| done <<<"$VPNCMD_SERVER" |
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The fix for processing VPNCMD_SERVER commands is incorrect and introduces a regression.
- Array Handling:
CMDis an array created byread -a. In bash,"$CMD"only expands to the first element of the array ("${CMD[0]}"). - Argument Splitting: By quoting
"$CMD", the shell passes the entire command string (including arguments) as a single argument to thevpncmd_serverfunction. Sincevpncmdexpects the command and its arguments as separate parameters, this will cause commands with arguments to fail. - Logic Error: The
read -acommand withIFS=";"splits the entire input string into the array. Thewhileloop only executes once becausereadconsumes the whole line. Since only the first element of the array is used, all subsequent commands in the semicolon-separated list are ignored.
This breaks the custom configuration functionality and can lead to a failure to apply important security settings.
| while IFS=";" read -r -a CMD; do | |
| vpncmd_server "$CMD" | |
| done <<<"$VPNCMD_SERVER" | |
| while IFS=";" read -r -a CMDS; do | |
| for cmd in "${CMDS[@]}"; do | |
| vpncmd_server $cmd | |
| done | |
| done <<<"$VPNCMD_SERVER" |
| while IFS=";" read -r -a CMD; do | ||
| vpncmd_hub "$CMD" | ||
| done <<<"$VPNCMD_HUB" |
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Same issue as with VPNCMD_SERVER. The current implementation only executes the first command and fails if it has arguments.
| while IFS=";" read -r -a CMD; do | |
| vpncmd_hub "$CMD" | |
| done <<<"$VPNCMD_HUB" | |
| while IFS=";" read -r -a CMDS; do | |
| for cmd in "${CMDS[@]}"; do | |
| vpncmd_hub $cmd | |
| done | |
| done <<<"$VPNCMD_HUB" |
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In `@copyables/entrypoint.sh`:
- Around line 158-168: The loops reading VPNCMD_SERVER and VPNCMD_HUB currently
use read -a CMD but call vpncmd_server/vpncmd_hub with "$CMD" which expands to
only ${CMD[0]}; change each while-read block to iterate the array elements (use
"${CMD[@]}" or an inner for-loop) and call vpncmd_server or vpncmd_hub once per
element so every semicolon-separated command is executed (refer to
VPNCMD_SERVER, VPNCMD_HUB, the CMD array, and functions
vpncmd_server/vpncmd_hub).
🧹 Nitpick comments (3)
copyables/gencert.sh (1)
4-4: Redirect order2>&1 >/dev/nulldoes not suppress stderr.The current order redirects stderr to the original stdout (the terminal) and then redirects stdout to
/dev/null. So stderr still reaches the caller. If the intent is to silence both streams, the correct order is>/dev/null 2>&1. This pre-dates your change, but since you're touching these lines anyway it's worth fixing. The same pattern also appears inentrypoint.sh(lines 62, 68, 112, 178).Proposed fix
-/usr/local/bin/vpnserver start 2>&1 >/dev/null +/usr/local/bin/vpnserver start >/dev/null 2>&1- /usr/local/bin/vpncmd localhost /SERVER /CSV /CMD OpenVpnEnable yes /PORTS:1194 2>&1 >/dev/null + /usr/local/bin/vpncmd localhost /SERVER /CSV /CMD OpenVpnEnable yes /PORTS:1194 >/dev/null 2>&1Also applies to: 10-10
copyables/entrypoint.sh (2)
62-62: Same2>&1 >/dev/nullredirect-order issue as ingencert.sh.See the comment on
gencert.sh—2>&1must come after>/dev/nullto actually suppress stderr. All four lines here have the same problem.Also applies to: 68-68, 112-112, 178-178
79-79: Several variable expansions on unchanged lines are still unquoted.Given the PR's goal of fixing unquoted variables, these are worth addressing for consistency:
- Line 79:
/PSK:${PSK}→/PSK:"${PSK}"- Line 86:
/MTU:$MTU→/MTU:"$MTU"- Line 172:
${HPW}→"${HPW}"- Line 176:
${SPW}→"${SPW}"Passwords and secrets with special characters would still be vulnerable to word-splitting here.
Also applies to: 86-86, 172-172, 176-176
| if [[ "$VPNCMD_SERVER" ]]; then | ||
| while IFS=";" read -r -a CMD; do | ||
| vpncmd_server "$CMD" | ||
| done <<<"$VPNCMD_SERVER" | ||
| fi | ||
|
|
||
| if [[ $VPNCMD_HUB ]]; then | ||
| while IFS=";" read -ra CMD; do | ||
| vpncmd_hub $CMD | ||
| if [[ "$VPNCMD_HUB" ]]; then | ||
| while IFS=";" read -r -a CMD; do | ||
| vpncmd_hub "$CMD" | ||
| done <<<"$VPNCMD_HUB" | ||
| fi |
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Bug: "$CMD" only expands to the first array element — all commands after the first semicolon are silently dropped.
read -r -a CMD splits the input by IFS=";" into an array, but "$CMD" (without an index) is equivalent to "${CMD[0]}". This means only the first semicolon-separated command is executed; the rest are silently ignored. ShellCheck SC2128 flags this exact issue.
Compare with the USERS block (lines 141–146) which correctly uses an inner for loop to iterate all array elements. Apply the same pattern here:
Proposed fix
if [[ "$VPNCMD_SERVER" ]]; then
while IFS=";" read -r -a CMD; do
- vpncmd_server "$CMD"
+ for c in "${CMD[@]}"; do
+ vpncmd_server "$c"
+ done
done <<<"$VPNCMD_SERVER"
fi
if [[ "$VPNCMD_HUB" ]]; then
while IFS=";" read -r -a CMD; do
- vpncmd_hub "$CMD"
+ for c in "${CMD[@]}"; do
+ vpncmd_hub "$c"
+ done
done <<<"$VPNCMD_HUB"
fi📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| if [[ "$VPNCMD_SERVER" ]]; then | |
| while IFS=";" read -r -a CMD; do | |
| vpncmd_server "$CMD" | |
| done <<<"$VPNCMD_SERVER" | |
| fi | |
| if [[ $VPNCMD_HUB ]]; then | |
| while IFS=";" read -ra CMD; do | |
| vpncmd_hub $CMD | |
| if [[ "$VPNCMD_HUB" ]]; then | |
| while IFS=";" read -r -a CMD; do | |
| vpncmd_hub "$CMD" | |
| done <<<"$VPNCMD_HUB" | |
| fi | |
| if [[ "$VPNCMD_SERVER" ]]; then | |
| while IFS=";" read -r -a CMD; do | |
| for c in "${CMD[@]}"; do | |
| vpncmd_server "$c" | |
| done | |
| done <<<"$VPNCMD_SERVER" | |
| fi | |
| if [[ "$VPNCMD_HUB" ]]; then | |
| while IFS=";" read -r -a CMD; do | |
| for c in "${CMD[@]}"; do | |
| vpncmd_hub "$c" | |
| done | |
| done <<<"$VPNCMD_HUB" | |
| fi |
🧰 Tools
🪛 Shellcheck (0.11.0)
[warning] 160-160: Expanding an array without an index only gives the first element.
(SC2128)
[warning] 166-166: Expanding an array without an index only gives the first element.
(SC2128)
🤖 Prompt for AI Agents
In `@copyables/entrypoint.sh` around lines 158 - 168, The loops reading
VPNCMD_SERVER and VPNCMD_HUB currently use read -a CMD but call
vpncmd_server/vpncmd_hub with "$CMD" which expands to only ${CMD[0]}; change
each while-read block to iterate the array elements (use "${CMD[@]}" or an inner
for-loop) and call vpncmd_server or vpncmd_hub once per element so every
semicolon-separated command is executed (refer to VPNCMD_SERVER, VPNCMD_HUB, the
CMD array, and functions vpncmd_server/vpncmd_hub).
1 participant
🚨 Severity: HIGH
💡 Vulnerability: Unquoted variables in
entrypoint.shallowed argument splitting and glob expansion.🎯 Impact: Passwords with spaces were mishandled; wildcards could trigger unexpected file matching.
🔧 Fix: Applied proper quoting,
read -r, and fixedprintfusage. Also fixed paths ingencert.sh.✅ Verification: Verified with reproduction script and syntax checks.
PR created automatically by Jules for task 16747109593899495064 started by @bluPhy
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Release Notes
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Bug Fixes