🛡️ Sentinel: Fix insecure file permissions in backup script#41
🛡️ Sentinel: Fix insecure file permissions in backup script#41
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- Restrict backup directory permissions to 0700 (owner only) - Create backup archives with umask 077 and chmod 0600 - Ensure logs are stored in a 0700 directory This prevents potential information disclosure on multi-user systems. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughIntroduces file permission security hardening to the backup script by documenting an insecure permissions vulnerability and implementing preventive measures: setting explicit directory permissions (700), applying strict umask (077) during archive creation, and restricting archive files to 600 permissions. Changes
Estimated Code Review Effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
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Actionable comments posted: 1
🧹 Nitpick comments (1)
tools/backup-projects.sh (1)
353-356: Considermkdir -m 700to eliminate the TOCTOU gap and make intent explicit.
chmod 700applied aftermkdir -pleaves a brief window where the directory exists with default-umask permissions. While low-risk in this single-user context, using-m 700is the idiomatic way to set the mode atomically at creation time.♻️ Proposed refactor
- mkdir -p "$BACKUP_TEMP_DIR" - chmod 700 "$BACKUP_TEMP_DIR" - mkdir -p "$LOG_DIR" - chmod 700 "$LOG_DIR" + mkdir -m 700 -p "$BACKUP_TEMP_DIR" + mkdir -m 700 -p "$LOG_DIR"Note:
mkdir -m 700 -psets the mode on the final path component only; any intermediate directories created by-pstill inherit the umask. If$BACKUP_BASE_DIRor parent paths of$LOG_DIRare expected to be newly created, add explicitchmod 700calls for those parents as well.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tools/backup-projects.sh` around lines 353 - 356, Replace the two-step create-then-chmod for BACKUP_TEMP_DIR and LOG_DIR with atomic creation using mkdir -m 700 -p to avoid the TOCTOU window: change the mkdir/ chmod sequence that references "$BACKUP_TEMP_DIR" and "$LOG_DIR" so the directory is created with mode 700 in one call, and if you expect intermediate parent directories (e.g., parents of "$BACKUP_BASE_DIR" or parents of "$LOG_DIR") to be newly created by -p, retain explicit chmod 700 calls for those parent paths since -m on mkdir -p only applies to the final path component.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the top heading "2025-02-25 - Insecure File
Permissions in Backup Script" to an H1 and correct the year to 2026 (e.g., "#
2026-02-25 - Insecure File Permissions in Backup Script"), ensure there is a
blank line immediately after that heading to satisfy MD022, and reflow/wrap the
following paragraph lines to at most 80 characters to fix MD013 so the
description lines (the text under the heading) are split into shorter lines;
after these edits verify markdownlint no longer reports MD041, MD022, or MD013
failures.
---
Nitpick comments:
In `@tools/backup-projects.sh`:
- Around line 353-356: Replace the two-step create-then-chmod for
BACKUP_TEMP_DIR and LOG_DIR with atomic creation using mkdir -m 700 -p to avoid
the TOCTOU window: change the mkdir/ chmod sequence that references
"$BACKUP_TEMP_DIR" and "$LOG_DIR" so the directory is created with mode 700 in
one call, and if you expect intermediate parent directories (e.g., parents of
"$BACKUP_BASE_DIR" or parents of "$LOG_DIR") to be newly created by -p, retain
explicit chmod 700 calls for those parent paths since -m on mkdir -p only
applies to the final path component.
| ## 2025-02-25 - Insecure File Permissions in Backup Script | ||
| **Vulnerability:** The `tools/backup-projects.sh` script created backup archives and log directories without explicitly setting restrictive permissions. This meant that on multi-user systems (or even locally if shared), backup archives containing potentially sensitive project code and secrets were readable by other users (group/world readable depending on umask). | ||
| **Learning:** Default umask settings (often 022) are insufficient for security-critical operations like backups. Relying on default permissions assumes a secure environment, which is not always true. | ||
| **Prevention:** Always use `umask 077` in subshells when creating sensitive files or directories. Explicitly `chmod 700` directories and `chmod 600` files after creation to enforce defense-in-depth. |
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Fix markdown lint failures (pipeline broken) and correct the year in the heading date.
Five markdownlint failures are blocking the Lint Documentation check:
| Line | Rule | Fix |
|---|---|---|
| 1 | MD041 – first line must be h1 (#, not ##) |
Change ## → # |
| 1 | MD022 – heading must be surrounded by blank lines | Add a blank line after the heading |
| 2–4 | MD013 – lines exceed 80 chars | Wrap long sentences at ≤80 chars |
Additionally, the heading date reads 2025-02-25 but the PR was opened on 2026-02-25.
📝 Proposed fix
-## 2025-02-25 - Insecure File Permissions in Backup Script
-**Vulnerability:** The `tools/backup-projects.sh` script created backup archives and log directories without explicitly setting restrictive permissions. This meant that on multi-user systems (or even locally if shared), backup archives containing potentially sensitive project code and secrets were readable by other users (group/world readable depending on umask).
-**Learning:** Default umask settings (often 022) are insufficient for security-critical operations like backups. Relying on default permissions assumes a secure environment, which is not always true.
-**Prevention:** Always use `umask 077` in subshells when creating sensitive files or directories. Explicitly `chmod 700` directories and `chmod 600` files after creation to enforce defense-in-depth.
+# 2026-02-25 - Insecure File Permissions in Backup Script
+
+**Vulnerability:** The `tools/backup-projects.sh` script created backup archives and log
+directories without explicitly setting restrictive permissions. On multi-user systems,
+backup archives containing potentially sensitive project code and secrets were readable
+by other users (group/world readable depending on umask).
+
+**Learning:** Default umask settings (often 022) are insufficient for security-critical
+operations like backups. Relying on default permissions assumes a secure environment,
+which is not always true.
+
+**Prevention:** Always use `umask 077` in subshells when creating sensitive files or
+directories. Explicitly `chmod 700` directories and `chmod 600` files after creation
+to enforce defense-in-depth.📝 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.
| ## 2025-02-25 - Insecure File Permissions in Backup Script | |
| **Vulnerability:** The `tools/backup-projects.sh` script created backup archives and log directories without explicitly setting restrictive permissions. This meant that on multi-user systems (or even locally if shared), backup archives containing potentially sensitive project code and secrets were readable by other users (group/world readable depending on umask). | |
| **Learning:** Default umask settings (often 022) are insufficient for security-critical operations like backups. Relying on default permissions assumes a secure environment, which is not always true. | |
| **Prevention:** Always use `umask 077` in subshells when creating sensitive files or directories. Explicitly `chmod 700` directories and `chmod 600` files after creation to enforce defense-in-depth. | |
| # 2026-02-25 - Insecure File Permissions in Backup Script | |
| **Vulnerability:** The `tools/backup-projects.sh` script created backup archives and log | |
| directories without explicitly setting restrictive permissions. On multi-user systems, | |
| backup archives containing potentially sensitive project code and secrets were readable | |
| by other users (group/world readable depending on umask). | |
| **Learning:** Default umask settings (often 022) are insufficient for security-critical | |
| operations like backups. Relying on default permissions assumes a secure environment, | |
| which is not always true. | |
| **Prevention:** Always use `umask 077` in subshells when creating sensitive files or | |
| directories. Explicitly `chmod 700` directories and `chmod 600` files after creation | |
| to enforce defense-in-depth. |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 198] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 3-3: Line length
.jules/sentinel.md:3:81 MD013/line-length Line length [Expected: 80; Actual: 199] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 2-2: Line length
.jules/sentinel.md:2:81 MD013/line-length Line length [Expected: 80; Actual: 365] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 1-1: First line in a file should be a top-level heading
.jules/sentinel.md:1 MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## 2025-02-25 - Insecure File ..."] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md041.md
[failure] 1-1: Headings should be surrounded by blank lines
.jules/sentinel.md:1 MD022/blanks-around-headings Headings should be surrounded by blank lines [Expected: 1; Actual: 0; Below] [Context: "## 2025-02-25 - Insecure File Permissions in Backup Script"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.jules/sentinel.md around lines 1 - 4, Change the top heading "2025-02-25 -
Insecure File Permissions in Backup Script" to an H1 and correct the year to
2026 (e.g., "# 2026-02-25 - Insecure File Permissions in Backup Script"), ensure
there is a blank line immediately after that heading to satisfy MD022, and
reflow/wrap the following paragraph lines to at most 80 characters to fix MD013
so the description lines (the text under the heading) are split into shorter
lines; after these edits verify markdownlint no longer reports MD041, MD022, or
MD013 failures.
1 participant
🛡️ Sentinel: [CRITICAL/HIGH] Fix Insecure File Permissions in Backup Script
🚨 Severity: HIGH
💡 Vulnerability: Backup archives containing potentially sensitive project code were created with default umask permissions (often 0644 or 0664), making them readable by other users on the system.
🎯 Impact: Unauthorized users could access project source code, secrets, and configuration files stored in backups.
🔧 Fix:
chmod 700to backup and log directories.umask 077within the zip creation subshell.chmod 600to the generated archive file.✅ Verification:
mkdiris followed bychmod 700.zipruns underumask 077.chmod 600.PR created automatically by Jules for task 6173289691338400290 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation