Security

DLC: Security Scan

Run security checks against the current project and create a GitHub issue with findings.

Before running, read ../dlc/references/ISSUE-TEMPLATE.md now for the issue format, and read ../dlc/references/REPORT-FORMAT.md now for the findings data structure.

Step 1: Detect Project Type

Scan the repository root for project indicators:

If multiple indicators exist, treat as a monorepo and scan each.

Step 2: Run Security Tools

For each detected project type, run tools in this priority order. Use the first available tool; skip unavailable ones.

Dependency Audit

Select the tool based on availability (command -v), not exit codes — audit tools exit non-zero when vulnerabilities are found, which is a valid result to capture.

# Node.js — select by availability
if command -v npm >/dev/null 2>&1; then
  npm audit --json 2>/dev/null
elif command -v bun >/dev/null 2>&1; then
  bun audit 2>/dev/null
fi

# Python
command -v pip-audit >/dev/null 2>&1 && pip-audit --format=json 2>/dev/null

# Rust
command -v cargo-audit >/dev/null 2>&1 && cargo audit --json 2>/dev/null

# Go
command -v govulncheck >/dev/null 2>&1 && govulncheck ./... 2>/dev/null

Dependency Staleness

Check for packages significantly behind the latest stable release — these accumulate security patches without formal CVEs.

Select tools based on availability (command -v), not exit codes — staleness tools exit non-zero when outdated packages are found, which is a valid result to capture.

# Node.js — prefer npm, fall back to Bun
if command -v npm >/dev/null 2>&1; then
  npm outdated --json 2>/dev/null
elif command -v bun >/dev/null 2>&1; then
  bun outdated 2>/dev/null
fi

# Python
command -v pip >/dev/null 2>&1 && pip list --outdated --format=json 2>/dev/null

# Rust
command -v cargo-outdated >/dev/null 2>&1 && cargo outdated --json 2>/dev/null

# Go
command -v go >/dev/null 2>&1 && go list -u -m -json all 2>/dev/null

Static Analysis (SAST)

Try in order — use the first available:

1. Semgrep (preferred): semgrep scan --config=auto --json .
2. Trivy (filesystem mode): trivy fs --format json --scanners vuln,secret .
3. Claude static analysis (fallback): Manually review files matching security-sensitive patterns

Secret Detection

# Try gitleaks first
gitleaks detect --source . --no-git --report-format json 2>/dev/null

# Fallback: grep for common patterns. Not POSIX grep — -r, -o, and the
# --include long option are all GNU/BSD extensions this command relies on.
# -o prints only the matched token itself — never the surrounding line — so
# the actual secret value never reaches output. This scan's findings end up
# in the issue's Raw Output section, which gets posted verbatim to a public
# GitHub issue.
#
# A prior version of this fix tried to strip the line content in a separate
# sed pass keyed on "first two colon-delimited fields = path:line". That
# breaks on any filename containing a colon (valid on Linux/macOS): grep's
# own "path:line:" prefix becomes ambiguous, the substitution silently fails
# to match, and the raw secret-containing line passes through unredacted —
# verified empirically. -o has no such ambiguity: none of these five patterns
# captures a value, only a short fixed prefix/keyword (AKIA, sk-, ghp_,
# "password =", "secret ="), so there's nothing sensitive left to leak either
# way the line is parsed downstream.
#
# Do NOT widen any pattern to capture the secret body itself (e.g.
# AKIA[A-Z0-9]{16} instead of bare AKIA) — -o's safety depends entirely on
# every pattern staying prefix/keyword-only. A body-matching pattern would
# print the actual secret value straight into the public issue.
#
# --include flags come before the pattern and the pattern comes before `.` —
# verified empirically that with option permutation disabled (POSIXLY_CORRECT=1,
# and some non-GNU grep builds by default), --include after the pattern gets
# consumed as a positional filename argument instead of a flag, producing
# "No such file or directory" for every --include and a nonzero exit code.
# *.env* (not *.env) so .env.local / .env.production match too — verified
# a leading * in --include isn't shell-glob-style hidden-file-exclusive,
# it already matches dotfiles like .env.local without a separate .env*
# pattern.
grep -rnoE \
  --include="*.ts" --include="*.js" --include="*.py" --include="*.go" \
  --include="*.rs" --include="*.java" --include="*.rb" --include="*.env*" \
  "AKIA|sk-|ghp_|password[[:space:]]*=|secret[[:space:]]*=" .

If no specialized security tools are available, use the Explore agent to discover security-sensitive areas across the codebase. Use repomix-explorer (if available) for large codebases to get a structural overview. Then use targeted Grep and Read for detailed analysis:

• Review files matching **/auth/**, **/login/**, **/api/**, **/*.env*
• Check for hardcoded credentials, SQL injection, XSS, insecure crypto
• Check dependency manifests for known-vulnerable version ranges

Step 3: Classify Findings

Map tool output to the findings format from REPORT-FORMAT.md.

Severity mapping (reinforced here for defense-in-depth):

Deduplicate findings that appear in multiple tools. Prefer the source with more detail.

Step 4: Create GitHub Issue

Read ../dlc/references/ISSUE-TEMPLATE.md now and format the issue body exactly as specified.

Critical format rules (reinforced here):

• Title: [DLC] Security: {summary of top finding}
• Label: dlc-security
• Body must contain: Scan Metadata table, Findings Summary table (severity x count), Findings Detail grouped by severity, Recommended Actions, Raw Output in collapsed details

Acquire BRANCH for the Scan Metadata table above — ISSUE-TEMPLATE.md's lifecycle acquires REPO itself. Then follow ISSUE-TEMPLATE.md's Issue Creation Command lifecycle exactly — substitute {skill-name} = security, {Type} = Security, {type} = security, {additional-required-sections} = '## Raw Output':

BRANCH=$(git branch --show-current)
echo "BRANCH=$BRANCH"   # ISSUE-TEMPLATE.md's Write step is a separate tool call and can't see this shell's variables

Step 5: Report

Print a summary to the user:

Security scan complete.
  - Project type: {type}
  - Tools used: {list}
  - Findings: {critical} critical, {high} high, {medium} medium, {low} low
  - Issue: #{number} ({url})

If no findings, skip issue creation and report: "No security issues found."