a079050108
The client scan resolved images by pulling from Docker Hub, which fails on an
offline/privacy box ("index.docker.io ... network is unreachable") — yet every
installed app's image is already present locally. Point Trivy at the docker
socket that's already bind-mounted into the container (--image-src docker, plus
DOCKER_HOST=unix:///run/user/<uid>/docker.sock for rootless, derived from the
install user — rooted's default path is found automatically). Scans local
images with zero network. Verified: aquasec/trivy:latest -> 28 CVEs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
88 lines
4.4 KiB
Bash
88 lines
4.4 KiB
Bash
#!/bin/bash
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# Trivy CVE scanner integration — probed by the WebUI updater generator.
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# ---------------------------------------------------------------------------
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# Trivy (containers/trivy) runs as a long-lived server whose vulnerability DB
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# is cached in ./trivy-cache. On first start — and periodically after — that DB
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# is downloaded (tens of MB). Until it lands NO scan can produce results, so the
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# WebUI must not paint a green "no known vulnerabilities" all-clear yet.
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#
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# These helpers expose the scanner's state so the updater generator can write an
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# honest cves.json:
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# absent — Trivy isn't installed/running (CVE scanning unavailable)
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# db_updating — installed, but the vulnerability DB is still downloading
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# ready — DB present; real per-image scans can run
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# Every helper degrades to the safe answer (absent / [] ) on any error so the
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# generator never breaks.
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# Echoes: absent | db_updating | ready
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trivyScannerState() {
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# Not in `docker ps` (never installed, stopped, or still starting) -> absent.
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dockerCommandRun "docker ps --format '{{.Names}}'" 2>/dev/null \
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| grep -qx trivy-service || { echo absent; return; }
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# Running: the DB is ready once `trivy version` reports a VulnerabilityDB
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# block (null/absent while it's still being fetched on first boot).
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local ver; ver="$(dockerCommandRun "docker exec trivy-service trivy version -f json" 2>/dev/null)"
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[ -n "$ver" ] || { echo db_updating; return; }
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if command -v jq >/dev/null 2>&1; then
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[ -n "$(printf '%s' "$ver" | jq -r '.VulnerabilityDB // empty' 2>/dev/null)" ] \
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&& echo ready || echo db_updating
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else
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# No jq: DownloadedAt only appears once the DB is present (and, unlike a
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# nullable VulnerabilityDB key, avoids a false positive when it's null).
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printf '%s' "$ver" | grep -q '"DownloadedAt"' \
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&& echo ready || echo db_updating
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fi
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}
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# Echoes the DB's UpdatedAt timestamp (ISO8601) if available, else nothing.
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trivyDbUpdatedAt() {
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command -v jq >/dev/null 2>&1 || return 0
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local ver; ver="$(dockerCommandRun "docker exec trivy-service trivy version -f json" 2>/dev/null)"
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[ -n "$ver" ] || return 0
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printf '%s' "$ver" | jq -r '.VulnerabilityDB.UpdatedAt // empty' 2>/dev/null
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}
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# trivyScanImageCves <image> — scan one image against the cached DB and echo a
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# JSON array of normalized CVE objects for the WebUI:
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# [ { id, severity, package, installed, fixed_in, url }, ... ]
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# Echoes [] on any failure so a single bad image never aborts the whole scan.
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# Requires jq (the generator already guards on it).
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trivyScanImageCves() {
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local image="$1"
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[ -n "$image" ] || { echo '[]'; return; }
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command -v jq >/dev/null 2>&1 || { echo '[]'; return; }
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# Scan the app's LOCAL image via the docker socket mounted into the
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# container (--image-src docker) so nothing is pulled from a registry — the
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# image is already present, and a privacy box may have no outbound at all.
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# Client mode (--server localhost:4954, the container's fixed --listen port)
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# leaves the vuln DB to the running server; a standalone scan would deadlock
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# on the server's cache lock. For rootless the daemon socket lives under
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# /run/user/<uid> (not trivy's default path), so point DOCKER_HOST at it;
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# rooted's /var/run/docker.sock is found by default.
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local envs=""
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if [ "${CFG_DOCKER_INSTALL_TYPE:-}" = "rootless" ] && [ -n "${docker_install_user:-}" ]; then
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local uid; uid="$(id -u "$docker_install_user" 2>/dev/null)"
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[ -n "$uid" ] && envs="-e DOCKER_HOST=unix:///run/user/$uid/docker.sock"
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fi
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# --quiet keeps the progress spinner out of stdout; we only want CRITICAL..LOW.
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local raw
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raw="$(dockerCommandRun "docker exec $envs trivy-service trivy image --server http://localhost:4954 --image-src docker --quiet --scanners vuln --format json --severity CRITICAL,HIGH,MEDIUM,LOW '$image'" 2>/dev/null)"
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[ -n "$raw" ] || { echo '[]'; return; }
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printf '%s' "$raw" | jq -c '
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[ (.Results // [])[] | (.Vulnerabilities // [])[] | {
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id: .VulnerabilityID,
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severity: ((.Severity // "UNKNOWN") | ascii_downcase),
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package: .PkgName,
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installed: (.InstalledVersion // ""),
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fixed_in: (.FixedVersion // ""),
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url: (.PrimaryURL // "")
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} ]
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| unique_by(.id + "|" + (.package // ""))
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' 2>/dev/null || echo '[]'
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}
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