feat: judge, sign and verify netOrk's images in one place (NetOrk/netork#1390)
CI / Tests, lint (push) Successful in 18s
CI / Tests, lint (push) Successful in 18s
The CIS gate, the SBOM, the cosign signature and the matcher's verdict lived in NetOrk/base-os, the head of the chain. Every link below it -- base-python, engine, ui, satellite, the service images -- needs the same, so the tools move here, and every image repository pins them by commit. - image_tools: cis.py, cis_os.sh, sbom.py and verify.py from base-os. The image's own repository holds its cis.toml and packages.allow; both default to the working directory. - bin/sign.sh signs whatever platforms a reference holds: base-os's index of amd64 and arm64 (EXPECT_PLATFORMS) or a dev image's single manifest (image_tools/platforms.py). - bin/verify-base.sh checks every FROM image of a Dockerfile against cosign.pub before a build; one without a digest is refused (image_tools/dockerfile.py). - bin/install-cosign.sh installs cosign v3.1.3 for amd64 and arm64 runners, checked against the release checksums. - actions/verify-base, judge, sign wrap them for the workflows. - cosign.pub is the public half of the COSIGN_PRIVATE_KEY_B64 org secret, the key rotated on 2026-10-22.
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#!/bin/sh
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# cis_os.sh: the CIS controls image_tools/cis.py measures from inside the image.
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#
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# Runs as root in the image, fed on stdin (docker run -i --user 0 ... sh -s), so
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# nothing has to be mounted from a runner whose paths the host daemon does not
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# know. Reads nothing from outside but CIS_PACKAGES, the package names the image
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# may hold. Prints one line per control:
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#
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# <id> TAB PASS|FAIL TAB <title> TAB <what fails>
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#
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# docker:* are the CIS Docker Benchmark 1.6.0 controls Trivy leaves to "Manual"
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# and that can be seen from inside; debian:* are the CIS Debian Linux 12 v1.1.0
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# controls that make sense in a container. Boot, partitions, kernel parameters,
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# services, logging, audit and sshd belong to the host (infrastructure
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# BAUSTANDARD §F) and are not measured here.
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set -u
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# check <id> <title> <function>: PASS when the function names no offender.
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check() {
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out=$("$3" 2>/dev/null | head -n 20 | tr '\n' ' ')
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if [ -z "$out" ]; then
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printf '%s\tPASS\t%s\t\n' "$1" "$2"
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else
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printf '%s\tFAIL\t%s\t%s\n' "$1" "$2" "${out% }"
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fi
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}
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login_defs() { awk -v k="$1" '$1 == k { v = $2 } END { print v }' /etc/login.defs; }
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# Shells one can log in with: /etc/shells without the nologin ones.
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SHELLS=$(grep '^/' /etc/shells | grep -v nologin)
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# --- CIS Docker Benchmark 1.6.0, section 4 -----------------------------------
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extra_packages() {
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dpkg-query -W -f '${Package}\n' | while read -r p; do
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case " ${CIS_PACKAGES:-} " in *" $p "*) ;; *) echo "$p" ;; esac
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done
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}
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setid_files() { find / -xdev -type f -perm /6000; }
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unverified_sources() {
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grep -rEil 'trusted=yes|Trusted: *yes|AllowUnauthenticated|AllowInsecureRepositories|AllowDowngradeToInsecureRepositories' /etc/apt
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for f in /etc/apt/sources.list.d/*.sources; do
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[ -e "$f" ] || continue
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awk -v f="$f" 'BEGIN { RS = "" } index($0, "Signed-By:") == 0 { print f }' "$f"
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done
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grep -sE '^[[:space:]]*deb[[:space:]]' /etc/apt/sources.list /etc/apt/sources.list.d/*.list \
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| grep -v 'signed-by='
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}
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check docker:4.3 "Unnecessary packages are not installed (packages.allow)" extra_packages
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check docker:4.8 "setuid and setgid permissions are removed" setid_files
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check docker:4.11 "Only verified packages are installed" unverified_sources
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# --- CIS Debian Linux 12 v1.1.0 ----------------------------------------------
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# in_range <key> <min> [max]: names the key unless min <= its value <= max.
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in_range() {
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v=$(login_defs "$1")
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case $v in '' | *[!0-9]*) echo "$1=${v:-unset}"; return ;; esac
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if [ "$v" -lt "$2" ] || [ "$v" -gt "${3:-$v}" ]; then echo "$1=$v"; fi
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}
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pass_max_days() { in_range PASS_MAX_DAYS 1 365; }
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pass_min_days() { in_range PASS_MIN_DAYS 1; }
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pass_warn_age() { in_range PASS_WARN_AGE 7; }
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weak_hashing() {
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v=$(login_defs ENCRYPT_METHOD)
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case $v in SHA512 | YESCRYPT) ;; *) echo "ENCRYPT_METHOD=${v:-unset}" ;; esac
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}
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weak_umask() {
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v=$(login_defs UMASK)
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case $v in '' | *[!0-7]*) echo "UMASK=${v:-unset}"; return ;; esac
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# 027 or stricter: group may not write, others get nothing
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if [ $(((0$v >> 3) & 2)) -eq 0 ] || [ $((0$v & 7)) -ne 7 ]; then echo "UMASK=$v"; fi
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}
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other_uid0() { awk -F: '$3 == "0" && $1 != "root" { print $1 }' /etc/passwd; }
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other_gid0_accounts() {
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awk -F: '$4 == "0" && $1 !~ /^(root|sync|shutdown|halt|operator)$/ { print $1 }' /etc/passwd
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}
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other_gid0_groups() { awk -F: '$3 == "0" && $1 != "root" { print $1 }' /etc/group; }
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root_unlocked() { awk -F: '$1 == "root" && $2 !~ /^[!*]/ { print "root" }' /etc/shadow; }
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system_login_shells() {
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min=$(login_defs UID_MIN)
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echo "$SHELLS" | awk -F: -v min="${min:-1000}" '
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NR == FNR { if ($0 != "") shell[$0] = 1; next }
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$1 != "root" && ($3 + 0 < min + 0 || $3 == "65534") && ($7 in shell) { print $1 }
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' - /etc/passwd
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}
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unlocked_without_shell() {
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echo "$SHELLS" | awk -F: '
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FILENAME == "-" { if ($0 != "") shell[$0] = 1; next }
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FILENAME == "/etc/passwd" { if ($1 != "root" && !($7 in shell)) nologin[$1] = 1; next }
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($1 in nologin) && $2 !~ /^[!*]/ { print $1 }
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' - /etc/passwd /etc/shadow
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}
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# too_open <file> <max mode> <owner> <group regex>: names the file when it is
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# more open than the mode allows or owned by someone else; a missing file is fine.
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too_open() {
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[ -e "$1" ] || return 0
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# shellcheck disable=SC2046
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set -- "$1" "$2" "$3" "$4" $(stat -Lc '%a %U %G' "$1")
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if [ $((0$5 & ~0$2 & 07777)) -ne 0 ] || [ "$6" != "$3" ] || ! echo "$7" | grep -qxE "$4"; then
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echo "$1=$5:$6:$7"
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fi
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}
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perm_passwd() { too_open /etc/passwd 644 root root; }
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perm_passwd_() { too_open /etc/passwd- 644 root root; }
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perm_group() { too_open /etc/group 644 root root; }
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perm_group_() { too_open /etc/group- 644 root root; }
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perm_shadow() { too_open /etc/shadow 640 root 'root|shadow'; }
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perm_shadow_() { too_open /etc/shadow- 640 root 'root|shadow'; }
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perm_gshadow() { too_open /etc/gshadow 640 root 'root|shadow'; }
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perm_gshadow_() { too_open /etc/gshadow- 640 root 'root|shadow'; }
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perm_shells() { too_open /etc/shells 644 root root; }
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perm_opasswd() { too_open /etc/security/opasswd 600 root root; }
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world_writable() {
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find / -xdev -type f -perm -0002
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find / -xdev -type d -perm -0002 ! -perm -1000
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}
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unowned() { find / -xdev \( -nouser -o -nogroup \); }
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not_shadowed() { awk -F: '$2 != "x" { print $1 }' /etc/passwd; }
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empty_passwords() { awk -F: '$2 == "" { print $1 }' /etc/shadow; }
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missing_groups() { awk -F: 'NR == FNR { g[$3] = 1; next } !($4 in g) { print $1 ":" $4 }' /etc/group /etc/passwd; }
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shadow_members() {
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awk -F: '
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NR == FNR { if ($1 == "shadow") { gid = $3; if ($4 != "") print "shadow:" $4 } next }
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gid != "" && $4 == gid { print $1 }
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' /etc/group /etc/passwd
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}
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dup_uids() { cut -d: -f3 /etc/passwd | sort | uniq -d; }
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dup_gids() { cut -d: -f3 /etc/group | sort | uniq -d; }
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dup_users() { cut -d: -f1 /etc/passwd | sort | uniq -d; }
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dup_groups() { cut -d: -f1 /etc/group | sort | uniq -d; }
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check debian:5.4.1.1 "Password expiration is configured" pass_max_days
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check debian:5.4.1.2 "Minimum password days are configured" pass_min_days
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check debian:5.4.1.3 "Password expiration warning days are configured" pass_warn_age
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check debian:5.4.1.4 "Strong password hashing algorithm is configured" weak_hashing
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check debian:5.4.2.1 "root is the only UID 0 account" other_uid0
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check debian:5.4.2.2 "root is the only GID 0 account" other_gid0_accounts
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check debian:5.4.2.3 "group root is the only GID 0 group" other_gid0_groups
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check debian:5.4.2.4 "root account access is controlled (locked)" root_unlocked
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check debian:5.4.2.7 "System accounts do not have a valid login shell" system_login_shells
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check debian:5.4.2.8 "Accounts without a valid login shell are locked" unlocked_without_shell
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check debian:5.4.3.3 "Default user umask is configured" weak_umask
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check debian:7.1.1 "Permissions on /etc/passwd are configured" perm_passwd
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check debian:7.1.2 "Permissions on /etc/passwd- are configured" perm_passwd_
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check debian:7.1.3 "Permissions on /etc/group are configured" perm_group
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check debian:7.1.4 "Permissions on /etc/group- are configured" perm_group_
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check debian:7.1.5 "Permissions on /etc/shadow are configured" perm_shadow
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check debian:7.1.6 "Permissions on /etc/shadow- are configured" perm_shadow_
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check debian:7.1.7 "Permissions on /etc/gshadow are configured" perm_gshadow
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check debian:7.1.8 "Permissions on /etc/gshadow- are configured" perm_gshadow_
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check debian:7.1.9 "Permissions on /etc/shells are configured" perm_shells
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check debian:7.1.10 "Permissions on /etc/security/opasswd are configured" perm_opasswd
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check debian:7.1.11 "World writable files and directories are secured" world_writable
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check debian:7.1.12 "No files or directories without an owner and a group exist" unowned
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check debian:7.2.1 "Accounts in /etc/passwd use shadowed passwords" not_shadowed
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check debian:7.2.2 "/etc/shadow password fields are not empty" empty_passwords
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check debian:7.2.3 "All groups in /etc/passwd exist in /etc/group" missing_groups
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check debian:7.2.4 "The shadow group is empty" shadow_members
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check debian:7.2.5 "No duplicate UIDs exist" dup_uids
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check debian:7.2.6 "No duplicate GIDs exist" dup_gids
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check debian:7.2.7 "No duplicate user names exist" dup_users
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check debian:7.2.8 "No duplicate group names exist" dup_groups
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