🛡️ Sentinel: [HIGH] Enforce strict permissions on backups#39
🛡️ Sentinel: [HIGH] Enforce strict permissions on backups#39
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**Vulnerability:** The `tools/backup-projects.sh` script created backup zip archives and log files with default system permissions (often 022/644). This meant that backup files containing source code and potentially sensitive information, as well as logs containing remote repository URLs, were world-readable on multi-user systems. **Fix:** Added `umask 077` to the beginning of `tools/backup-projects.sh`. This ensures that all files and directories created by the script (including temporary directories, log files, and the final zip archive) are only readable and writable by the owner (mode 600 or 700). **Verification:** - Verified syntax with `./build.sh syntax`. - Verified execution with `tools/backup-projects.sh --dry-run`. - Confirmed that `umask 077` is applied before any file creation operations. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughThis PR addresses a security vulnerability by documenting insecure backup permissions and implementing a umask 077 setting in the backup script. The change restricts file permissions so backups and logs are readable only by the owner, preventing exposure of sensitive data like remote URLs and tokens. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~8 minutes Poem
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Actionable comments posted: 1
🧹 Nitpick comments (1)
tools/backup-projects.sh (1)
30-31:umask 077placement is correct — pre-existing files from prior runs remain world-readableThe umask is set before any
mkdir, log writes, orzipinvocations, so all files created by this and future runs will be0600/0700. Good fix.One gap: backup archives and log files created by previous runs of the script still have their original
0644permissions. The umask change does not retroactively secure them. Similarly, if$BACKUP_BASE_DIRor$LOG_DIRalready exist on disk,mkdir -pis a no-op and their permissions are unchanged.Consider adding a one-time hardening step after directory creation:
🛡️ Retroactively tighten pre-existing dirs and old archives
# Setup directories if [[ "$DRY_RUN" != true ]]; then mkdir -p "$BACKUP_TEMP_DIR" mkdir -p "$LOG_DIR" + # Tighten permissions on dirs that may predate this umask fix + chmod 700 "$BACKUP_TEMP_DIR" "$LOG_DIR" 2>/dev/null || true + # Restrict any previously world-readable archives/logs + find "$BACKUP_TEMP_DIR" -name "*.zip" -type f -exec chmod 600 {} + 2>/dev/null || true + find "$LOG_DIR" -name "*.log" -type f -exec chmod 600 {} + 2>/dev/null || true else🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tools/backup-projects.sh` around lines 30 - 31, After creating directories and setting umask (after the existing mkdir -p lines and umask 077), add a one-time hardening step that tightens permissions on pre-existing items: for BACKUP_BASE_DIR and LOG_DIR recursively remove group/other permissions (set directories to 0700 and regular files to 0600) and explicitly tighten existing backup archives and log files (e.g., *.zip, *.tar.gz, *.bak and *.log) so older files become owner-only; perform this unconditionally once after mkdir -p to ensure retroactive security while leaving newly created files governed by umask 077.
🤖 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 file .jules/sentinel.md fails Markdown linting: change
the top heading "## 2026-02-23 - Insecure Permissions on Backups" to a top-level
heading (prefix with a single '#'), add a blank line immediately after that
heading, and reflow the long lines in the body (the vulnerability, learning, and
prevention lines) so no line exceeds 80 characters — e.g., split those sentences
into multiple lines or short paragraphs/bullets (keep the same content but wrap
text) to fix MD041, MD022, and MD013.
---
Nitpick comments:
In `@tools/backup-projects.sh`:
- Around line 30-31: After creating directories and setting umask (after the
existing mkdir -p lines and umask 077), add a one-time hardening step that
tightens permissions on pre-existing items: for BACKUP_BASE_DIR and LOG_DIR
recursively remove group/other permissions (set directories to 0700 and regular
files to 0600) and explicitly tighten existing backup archives and log files
(e.g., *.zip, *.tar.gz, *.bak and *.log) so older files become owner-only;
perform this unconditionally once after mkdir -p to ensure retroactive security
while leaving newly created files governed by umask 077.
| ## 2026-02-23 - Insecure Permissions on Backups | ||
| **Vulnerability:** `tools/backup-projects.sh` created backup zip archives and logs with default umask permissions (often 022/644), making them world-readable on multi-user systems. These backups contain source code and logs contain remote URLs (potentially with tokens). | ||
| **Learning:** Shell scripts creating sensitive files must explicitly manage permissions, as default system umasks are often permissive. | ||
| **Prevention:** Use `umask 077` at the start of scripts handling sensitive data to ensure files are only readable by the owner by default. |
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Markdown linting failures are breaking CI — fix MD041, MD022, and MD013
The "Lint Documentation" CI check has 5 failures on this new file:
- MD041 (line 1): file must start with a top-level
#heading, not## - MD022 (line 1): heading must be followed by a blank line
- MD013 (lines 2–4): lines exceed the 80-character limit (270, 135, and 138 chars respectively)
📝 Proposed fix
+# Sentinel Security Log
+
## 2026-02-23 - Insecure Permissions on Backups
-**Vulnerability:** `tools/backup-projects.sh` created backup zip archives and logs with default umask permissions (often 022/644), making them world-readable on multi-user systems. These backups contain source code and logs contain remote URLs (potentially with tokens).
-**Learning:** Shell scripts creating sensitive files must explicitly manage permissions, as default system umasks are often permissive.
-**Prevention:** Use `umask 077` at the start of scripts handling sensitive data to ensure files are only readable by the owner by default.
+
+**Vulnerability:** `tools/backup-projects.sh` created backup zip archives and
+logs with default umask permissions (often 022/644), making them world-readable
+on multi-user systems. These backups contain source code and logs contain remote
+URLs (potentially with tokens).
+
+**Learning:** Shell scripts creating sensitive files must explicitly manage
+permissions, as default system umasks are often permissive.
+
+**Prevention:** Use `umask 077` at the start of scripts handling sensitive data
+to ensure files are only readable by the owner by default.🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 138] 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: 135] 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: 270] 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: "## 2026-02-23 - Insecure Permi..."] 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: "## 2026-02-23 - Insecure Permissions on Backups"] 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 file .jules/sentinel.md fails
Markdown linting: change the top heading "## 2026-02-23 - Insecure Permissions
on Backups" to a top-level heading (prefix with a single '#'), add a blank line
immediately after that heading, and reflow the long lines in the body (the
vulnerability, learning, and prevention lines) so no line exceeds 80 characters
— e.g., split those sentences into multiple lines or short paragraphs/bullets
(keep the same content but wrap text) to fix MD041, MD022, and MD013.
1 participant
Enforce strict file permissions (umask 077) in the backup script to prevent unauthorized access to backup archives and logs.
PR created automatically by Jules for task 18209221158879420013 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation