🛡️ Sentinel: [MEDIUM] Fix insecure backup permissions#37
🛡️ Sentinel: [MEDIUM] Fix insecure backup permissions#37
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This change adds `umask 077` to `tools/backup-projects.sh` to ensure that all created files (including backup archives and logs) are only readable by the owner (rw-------). Previously, backups were created with default permissions (often rw-rw-r--), potentially exposing sensitive project code. Fixes: Insecure file permissions for project backups. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughThe pull request addresses a permissions vulnerability in the backup script by documenting the security issue and implementing a fix. A new sentinel note describes how backup scripts can inadvertently create world-readable artifacts, while the backup script adds a umask 077 directive to enforce restrictive file permissions on generated backups. Changes
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Poem
🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🤖 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: The markdown fails linting: change the opening "## 2026-02-21
- Insecure Backup Permissions" to a top-level heading by replacing it with "#
2026-02-21 - Insecure Backup Permissions" (this addresses MD041), add a blank
line immediately after that heading (MD022), and wrap or reflow the long lines
in the body (the lines referencing "Vulnerability:
`tools/backup-projects.sh`..." and "Prevention: Enforce `umask 077`..." and the
Learning line) so no line exceeds 80 characters (MD013); keep the same content
but split into shorter sentences or bullet lines to meet the limit.
| ## 2026-02-21 - Insecure Backup Permissions | ||
| **Vulnerability:** `tools/backup-projects.sh` created project backups with default umask permissions (often 644/755), making them world-readable. | ||
| **Learning:** Scripts generating sensitive artifacts (backups, keys, logs) must explicitly set permissions. Default umask is insufficient for privacy. | ||
| **Prevention:** Enforce `umask 077` at the start of any script that handles sensitive data or artifacts. |
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Fix markdown linting violations causing CI failures (MD041, MD022, MD013).
Five failures in the Lint Documentation check prevent a clean CI run:
- MD041: First line must be a top-level
#heading — the file opens with##. - MD022: The
##heading requires a blank line below it. - MD013: Lines 2–4 exceed the 80-character limit (actual: 145, 150, 104 chars).
📝 Proposed fix
-## 2026-02-21 - Insecure Backup Permissions
-**Vulnerability:** `tools/backup-projects.sh` created project backups with default umask permissions (often 644/755), making them world-readable.
-**Learning:** Scripts generating sensitive artifacts (backups, keys, logs) must explicitly set permissions. Default umask is insufficient for privacy.
-**Prevention:** Enforce `umask 077` at the start of any script that handles sensitive data or artifacts.
+# Sentinel Notes
+
+## 2026-02-21 - Insecure Backup Permissions
+
+**Vulnerability:** `tools/backup-projects.sh` created project backups with
+default umask permissions (often 644/755), making them world-readable.
+
+**Learning:** Scripts generating sensitive artifacts (backups, keys, logs) must
+explicitly set permissions. Default umask is insufficient for privacy.
+
+**Prevention:** Enforce `umask 077` at the start of any script that handles
+sensitive data or artifacts.📝 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.
| ## 2026-02-21 - Insecure Backup Permissions | |
| **Vulnerability:** `tools/backup-projects.sh` created project backups with default umask permissions (often 644/755), making them world-readable. | |
| **Learning:** Scripts generating sensitive artifacts (backups, keys, logs) must explicitly set permissions. Default umask is insufficient for privacy. | |
| **Prevention:** Enforce `umask 077` at the start of any script that handles sensitive data or artifacts. | |
| # Sentinel Notes | |
| ## 2026-02-21 - Insecure Backup Permissions | |
| **Vulnerability:** `tools/backup-projects.sh` created project backups with | |
| default umask permissions (often 644/755), making them world-readable. | |
| **Learning:** Scripts generating sensitive artifacts (backups, keys, logs) must | |
| explicitly set permissions. Default umask is insufficient for privacy. | |
| **Prevention:** Enforce `umask 077` at the start of any script that handles | |
| sensitive data or artifacts. |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 104] 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: 150] 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: 145] 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: "## 2026-02-21 - Insecure Backu..."] 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: "## 2026-02-21 - Insecure Backup Permissions"] 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, The markdown fails linting: change
the opening "## 2026-02-21 - Insecure Backup Permissions" to a top-level heading
by replacing it with "# 2026-02-21 - Insecure Backup Permissions" (this
addresses MD041), add a blank line immediately after that heading (MD022), and
wrap or reflow the long lines in the body (the lines referencing "Vulnerability:
`tools/backup-projects.sh`..." and "Prevention: Enforce `umask 077`..." and the
Learning line) so no line exceeds 80 characters (MD013); keep the same content
but split into shorter sentences or bullet lines to meet the limit.
1 participant
🛡️ Sentinel: [MEDIUM] Fix insecure backup permissions
🚨 Severity: MEDIUM
💡 Vulnerability: Project backups were created with default system permissions (often world-readable), potentially exposing sensitive source code.
🎯 Impact: Unauthorized local users could read the contents of backup archives.
🔧 Fix: Enforced
umask 077at the start oftools/backup-projects.sh.✅ Verification: Verified with a reproduction script that new backups have
-rw-------permissions.PR created automatically by Jules for task 230951383663742677 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation