🛡️ Sentinel: [HIGH] Fix SSH private key race condition #16
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Use umask 077 when restoring private keys to ensure they are created with secure permissions (0600) atomically, eliminating a window where they might be readable by other users. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughA new security documentation file was added describing a race condition vulnerability in SSH private key creation. The setup script was updated to implement the recommended fix by using umask (077) to ensure private keys are created atomically with restrictive 0600 permissions. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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Actionable comments posted: 1
🤖 Fix all issues with AI agents
In @.jules/sentinel.md:
- Around line 1-4: Update the markdown to satisfy MD041/MD022/MD013 by lowering
the heading level for "2025-01-31 - Secure File Creation with 1Password CLI"
(e.g., use ### or ####), add a blank line immediately after that heading, and
reflow any long sentences (such as the Vulnerability, Learning, and Prevention
lines mentioning `tools/setup-ssh-keys.sh`, `umask 077`, and the subshell
pattern) so no line exceeds ~80 characters; keep the same wording and symbols
(the heading text, `tools/setup-ssh-keys.sh`, `umask 077`, and the subshell
pattern) while breaking lines at logical points to satisfy the linter.
| ## 2025-01-31 - Secure File Creation with 1Password CLI | ||
| **Vulnerability:** Race condition in `tools/setup-ssh-keys.sh` where private keys were written to disk with default permissions before being restricted, exposing them to other users on the system. | ||
| **Learning:** Shell redirection `>` creates files with default umask (often 022/644) before `chmod` can run. | ||
| **Prevention:** Use `(umask 077; command > file)` subshell pattern to ensure sensitive files are created with 0600 permissions atomically. |
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Fix markdownlint failures (heading level, blank line, line length).
The lint job flags MD041/MD022/MD013 here. Consider updating the heading level, add a blank line after the heading, and wrap long lines to ≤80 chars.
🧹 Suggested formatting fix
-## 2025-01-31 - Secure File Creation with 1Password CLI
-**Vulnerability:** Race condition in `tools/setup-ssh-keys.sh` where private keys were written to disk with default permissions before being restricted, exposing them to other users on the system.
-**Learning:** Shell redirection `>` creates files with default umask (often 022/644) before `chmod` can run.
-**Prevention:** Use `(umask 077; command > file)` subshell pattern to ensure sensitive files are created with 0600 permissions atomically.
+# 2025-01-31 - Secure File Creation with 1Password CLI
+
+**Vulnerability:** Race condition in `tools/setup-ssh-keys.sh` where private keys
+were written to disk with default permissions before being restricted, exposing
+them to other users on the system.
+**Learning:** Shell redirection `>` creates files with default umask (often
+022/644) before `chmod` can run.
+**Prevention:** Use `(umask 077; command > file)` subshell pattern to ensure
+sensitive files are created with 0600 permissions atomically.📝 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.
| ## 2025-01-31 - Secure File Creation with 1Password CLI | |
| **Vulnerability:** Race condition in `tools/setup-ssh-keys.sh` where private keys were written to disk with default permissions before being restricted, exposing them to other users on the system. | |
| **Learning:** Shell redirection `>` creates files with default umask (often 022/644) before `chmod` can run. | |
| **Prevention:** Use `(umask 077; command > file)` subshell pattern to ensure sensitive files are created with 0600 permissions atomically. | |
| # 2025-01-31 - Secure File Creation with 1Password CLI | |
| **Vulnerability:** Race condition in `tools/setup-ssh-keys.sh` where private keys | |
| were written to disk with default permissions before being restricted, exposing | |
| them to other users on the system. | |
| **Learning:** Shell redirection `>` creates files with default umask (often | |
| 022/644) before `chmod` can run. | |
| **Prevention:** Use `(umask 077; command > file)` subshell pattern to ensure | |
| sensitive files are created with 0600 permissions atomically. |
🧰 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: 108] 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: 196] 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: "## 2025-01-31 - Secure File Cr..."] 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: "## 2025-01-31 - Secure File Creation with 1Password CLI"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🤖 Prompt for AI Agents
In @.jules/sentinel.md around lines 1 - 4, Update the markdown to satisfy
MD041/MD022/MD013 by lowering the heading level for "2025-01-31 - Secure File
Creation with 1Password CLI" (e.g., use ### or ####), add a blank line
immediately after that heading, and reflow any long sentences (such as the
Vulnerability, Learning, and Prevention lines mentioning
`tools/setup-ssh-keys.sh`, `umask 077`, and the subshell pattern) so no line
exceeds ~80 characters; keep the same wording and symbols (the heading text,
`tools/setup-ssh-keys.sh`, `umask 077`, and the subshell pattern) while breaking
lines at logical points to satisfy the linter.
1 participant
🚨 Severity: HIGH
💡 Vulnerability: SSH private keys were written to disk with default permissions (potentially world-readable) before
chmod 600was applied, creating a race condition window where keys could be compromised.🎯 Impact: Local attackers could potentially read private keys during restoration.
🔧 Fix: Used
(umask 077; ...)subshell to ensure files are created with 0600 permissions atomically.✅ Verification: Verified with reproduction script and code review.
PR created automatically by Jules for task 18171977013562498813 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation
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