sandbox: shrink image 7.2GB → 3.8GB (cache cleanup, multi-stage Go build, drop ZAP) (#474)

containers/Dockerfile

@@ -1,3 +1,26 @@
+# ---------------------------------------------------------------------------
+# Builder stage: compile the Go tools here so the Go toolchain (~225MB) and the
+# module/build caches never reach the runtime image. The resulting binaries are
+# statically linked and copied into the final stage.
+# ---------------------------------------------------------------------------
+FROM kalilinux/kali-rolling:latest AS gobuilder
+
+RUN apt-get update && \
+    apt-get install -y kali-archive-keyring && \
+    apt-get update && \
+    apt-get install -y --no-install-recommends golang-go git ca-certificates
+
+ENV GOBIN=/out/bin
+RUN mkdir -p /out/bin && \
+    go install -v github.com/projectdiscovery/httpx/cmd/httpx@latest && \
+    go install -v github.com/projectdiscovery/katana/cmd/katana@latest && \
+    go install -v github.com/projectdiscovery/cvemap/cmd/vulnx@latest && \
+    go install -v github.com/jaeles-project/gospider@latest && \
+    go install -v github.com/projectdiscovery/interactsh/cmd/interactsh-client@latest
+
+# ---------------------------------------------------------------------------
+# Runtime stage
+# ---------------------------------------------------------------------------
 FROM kalilinux/kali-rolling:latest
 
 LABEL description="AI Agent Penetration Testing Environment with Comprehensive Automated Tools"
@@ -19,14 +42,13 @@ RUN apt-get update && \
     apt-get install -y --no-install-recommends \
     wget curl git vim nano unzip tar \
     apt-transport-https ca-certificates gnupg lsb-release \
-    build-essential software-properties-common \
-    gcc libc6-dev pkg-config libpcap-dev libssl-dev \
-    python3 python3-pip python3-dev python3-venv python3-setuptools \
-    golang-go \
+    software-properties-common \
+    gcc libc6-dev \
+    python3 python3-pip python3-venv python3-setuptools \
     net-tools dnsutils whois \
     file xxd \
     jq parallel ripgrep grep \
-    less man-db procps htop \
+    less procps htop \
     iproute2 iputils-ping netcat-traditional \
     nmap ncat ndiff \
     sqlmap nuclei subfinder naabu ffuf \
@@ -66,11 +88,8 @@ RUN curl -LsSf https://astral.sh/uv/install.sh | env UV_INSTALL_DIR=/usr/local/b
 USER pentester
 WORKDIR /tmp
 
-RUN go install -v github.com/projectdiscovery/httpx/cmd/httpx@latest && \
-    go install -v github.com/projectdiscovery/katana/cmd/katana@latest && \
-    go install -v github.com/projectdiscovery/cvemap/cmd/vulnx@latest && \
-    go install -v github.com/jaeles-project/gospider@latest && \
-    go install -v github.com/projectdiscovery/interactsh/cmd/interactsh-client@latest
+# Go tools are built in the gobuilder stage; copy the static binaries only.
+COPY --from=gobuilder --chown=pentester:pentester /out/bin/ /home/pentester/go/bin/
 
 RUN nuclei -update-templates
 
@@ -87,7 +106,10 @@ RUN npm install -g retire@latest && \
     npm install -g js-beautify@latest && \
     npm install -g @ast-grep/cli@latest && \
     npm install -g tree-sitter-cli@latest && \
-    npm install -g agent-browser@0.26.0
+    npm install -g agent-browser@0.26.0 && \
+    npm cache clean --force && \
+    # ast-grep ships two identical binaries (`ast-grep` and `sg`); dedupe (~52MB)
+    ln -sf ast-grep /home/pentester/.npm-global/lib/node_modules/@ast-grep/cli/sg
 
 ENV AGENT_BROWSER_EXECUTABLE_PATH=/usr/bin/chromium
 ENV AGENT_BROWSER_USER_AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
@@ -132,7 +154,14 @@ RUN git clone https://github.com/aravind0x7/JS-Snooper.git && \
 
 USER root
 
-RUN curl -sSfL https://raw.githubusercontent.com/trufflesecurity/trufflehog/main/scripts/install.sh | sh -s -- -b /usr/local/bin
+# Install trufflehog into a pentester-owned dir on PATH so its runtime self-update
+# (which replaces the binary in place) succeeds: as non-root `pentester` it cannot
+# overwrite a root-owned binary under /usr/local/bin, which otherwise fails with
+# "cannot move binary" and aborts the scan. Pin the initial version for
+# reproducible builds; self-update then pulls fresh detectors at runtime.
+ARG TRUFFLEHOG_VERSION=3.95.9
+RUN curl -sSfL https://raw.githubusercontent.com/trufflesecurity/trufflehog/main/scripts/install.sh | sh -s -- -b /home/pentester/.local/bin "v${TRUFFLEHOG_VERSION}" && \
+    chown -R pentester:pentester /home/pentester/.local
 RUN set -eux; \
     ARCH="$(uname -m)"; \
     case "$ARCH" in \
@@ -146,8 +175,6 @@ RUN set -eux; \
     install -m 0755 /tmp/gitleaks /usr/local/bin/gitleaks; \
     rm -f /tmp/gitleaks /tmp/gitleaks.tgz
 
-RUN apt-get update && apt-get install -y zaproxy
-
 RUN curl -sfL https://raw.githubusercontent.com/aquasecurity/trivy/main/contrib/install.sh | sh -s -- -b /usr/local/bin
 
 RUN apt-get install -y wapiti
@@ -163,7 +190,12 @@ USER root
 
 RUN apt-get autoremove -y && \
     apt-get autoclean && \
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    # Purge non-English locales (~160MB)
+    find /usr/share/locale -mindepth 1 -maxdepth 1 -type d \
+        ! -name 'en' ! -name 'en_US' ! -name 'C' -exec rm -rf {} + && \
+    # Remove package documentation and man pages not needed at runtime (~95MB)
+    rm -rf /usr/share/doc/* /usr/share/doc-base/* /usr/share/man/*
 
 ENV PATH="/home/pentester/go/bin:/home/pentester/.local/bin:/home/pentester/.npm-global/bin:/app/.venv/bin:$PATH"
 ENV VIRTUAL_ENV="/app/.venv"

strix/agents/prompts/system_prompt.jinja

@@ -196,7 +196,7 @@ EFFICIENCY TACTICS:
 - For Caido proxy automation inside Python, explicitly import from
   `caido_api`:
   `from caido_api import list_requests, view_request, repeat_request, list_sitemap, view_sitemap_entry, scope_rules`
-- Prefer established fuzzers/scanners where applicable: ffuf, sqlmap, zaproxy, nuclei, wapiti, arjun, httpx, katana, semgrep, bandit, trufflehog, nmap. Use scripts mainly to coordinate or validate around them, not to replace them without reason
+- Prefer established fuzzers/scanners where applicable: ffuf, sqlmap, nuclei, wapiti, arjun, httpx, katana, semgrep, bandit, trufflehog, nmap. Use scripts mainly to coordinate or validate around them, not to replace them without reason
 - For trial-heavy vectors (SQLi, XSS, XXE, SSRF, RCE, auth/JWT, deserialization), DO NOT iterate payloads manually in the browser. Always spray payloads via Python scripts through `exec_command` or terminal tools.
 - When using established fuzzers/scanners, use the proxy for inspection where helpful
 - Generate/adapt large payload corpora: combine encodings (URL, unicode, base64), comment styles, wrappers, time-based/differential probes. Expand with wordlists/templates
@@ -412,7 +412,6 @@ VULNERABILITY ASSESSMENT:
 - nuclei - Vulnerability scanner with templates
 - sqlmap - SQL injection detection/exploitation
 - trivy - Container/dependency vulnerability scanner
-- zaproxy - OWASP ZAP web app scanner
 - wapiti - Web vulnerability scanner
 
 WEB FUZZING & DISCOVERY:
@@ -450,10 +449,10 @@ PROXY & INTERCEPTION:
 - Ignore Caido proxy-generated 50x HTML error pages; these are proxy issues (might happen when requesting a wrong host or SSL/TLS issues, etc).
 
 PROGRAMMING:
-- Python 3, uv, Go, Node.js/npm
+- Python 3, uv, Node.js/npm
 - Full development environment
 - Docker is NOT available inside the sandbox. Do not run docker; rely on provided tools to run locally.
-- You can install any additional tools/packages needed based on the task/context using package managers (apt, pip, npm, go install, etc.)
+- You can install any additional tools/packages needed based on the task/context using package managers (apt, pip, npm, etc.)
 
 Directories:
 - /workspace - where you should work.