144 lines
5.3 KiB
Bash
144 lines
5.3 KiB
Bash
#!/usr/bin/env bash
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#
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# The PAM file editing, against copies of what the distributions ship.
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#
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# Turning face unlock on for sudo edits /etc/pam.d/sudo, and a mistake there
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# is a machine nobody can sudo on any more. So every layout this has to cope
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# with is here: where the line lands, that it lands once, and that turning it
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# off gives back the file exactly as it was.
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#
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# When the pam_harness from the build is there, the files that come out are
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# also run through real PAM, with the module missing on purpose: the dash in
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# front of the line has to make PAM skip it without a word.
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# check() runs its second argument with eval, so that is quoted on purpose.
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# shellcheck disable=SC2016
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set -uo pipefail
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here="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
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tmp="$(mktemp -d)"
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trap 'rm -rf -- "$tmp"' EXIT
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export FU_PAM_ETC_DIR="$tmp/etc"
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export FU_PAM_VENDOR_DIRS="$tmp/vendor"
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FU_LIBDIR="$here/src/lib"
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# shellcheck source=/dev/null
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source "$FU_LIBDIR/common.sh"
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# shellcheck source=/dev/null
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source "$FU_LIBDIR/config.sh"
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# shellcheck source=/dev/null
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source "$FU_LIBDIR/pam.sh"
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FU_PAM_MODULE="$tmp/lib/pam_face_unlock.so"
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mkdir -p "$tmp/lib" "$tmp/etc" "$tmp/vendor"
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: > "$FU_PAM_MODULE"
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failures=0
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check() {
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if eval "$2"; then
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printf 'ok %s\n' "$1"
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else
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printf 'FAIL %s\n' "$1"
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failures=$(( failures + 1 ))
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fi
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}
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# first_auth <file>: the first line that has anything to do with auth.
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first_auth() {
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grep -m1 -E '^[[:space:]]*(-?auth[[:space:]]|@include[[:space:]]+common-auth)' "$1"
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}
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# ---------------------------------------------------------------------------
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# The layouts
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# ---------------------------------------------------------------------------
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arch_sudo='#%PAM-1.0
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auth include system-auth
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account include system-auth
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session include system-auth
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session optional pam_systemd.so class=none'
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debian_sudo='#%PAM-1.0
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# Set up user limits from /etc/security/limits.conf.
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session required pam_limits.so
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session required pam_env.so readenv=1 user_readenv=0
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session required pam_env.so readenv=1 envfile=/etc/default/locale user_readenv=0
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@include common-auth
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@include common-account
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@include common-session-noninteractive'
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fedora_sudo='#%PAM-1.0
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auth include system-auth
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account include system-auth
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password include system-auth
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session optional pam_keyinit.so revoke
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session required pam_limits.so
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session include system-auth'
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arch_polkit='#%PAM-1.0
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auth include system-auth
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account include system-auth
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password include system-auth
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session include system-auth'
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for layout in arch_sudo debian_sudo fedora_sudo; do
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printf '%s\n' "${!layout}" > "$tmp/etc/sudo"
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cp "$tmp/etc/sudo" "$tmp/original"
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fu_pam_enable sudo
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check "$layout: turned on" 'fu_pam_enabled sudo'
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check "$layout: the face comes before the password" '[[ "$(first_auth "$tmp/etc/sudo")" == *pam_face_unlock.so* ]]'
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check "$layout: with the dash and as sufficient" 'grep -qE "^-auth[[:space:]]+sufficient[[:space:]]+$FU_PAM_MODULE\$" "$tmp/etc/sudo"'
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check "$layout: the header stays first" '[[ "$(head -n1 "$tmp/etc/sudo")" == "#%PAM-1.0" ]]'
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fu_pam_enable sudo
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check "$layout: turning it on twice adds it once" '[[ $(grep -c pam_face_unlock "$tmp/etc/sudo") -eq 1 ]]'
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fu_pam_disable sudo
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check "$layout: turning it off gives back the same file" 'cmp -s "$tmp/etc/sudo" "$tmp/original"'
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check "$layout: turned off" '! fu_pam_enabled sudo'
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rm -f "$tmp/etc/sudo"
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done
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# Only the distribution's copy, in /usr/lib/pam.d.
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printf '%s\n' "$arch_polkit" > "$tmp/vendor/polkit-1"
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fu_pam_enable polkit-1
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check "vendor polkit-1: a small file of our own in /etc" '[[ -f $tmp/etc/polkit-1 ]] && grep -qF "$FU_PAM_WRAPPER_MARK" "$tmp/etc/polkit-1"'
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check "vendor polkit-1: it includes the distribution's file" 'grep -qE "^auth[[:space:]]+include[[:space:]]+$tmp/vendor/polkit-1\$" "$tmp/etc/polkit-1"'
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check "vendor polkit-1: face first" '[[ "$(first_auth "$tmp/etc/polkit-1")" == *pam_face_unlock.so* ]]'
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check "vendor polkit-1: the distribution's file is left alone" '[[ "$(cat "$tmp/vendor/polkit-1")" == "$arch_polkit" ]]'
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fu_pam_disable polkit-1
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check "vendor polkit-1: turning it off removes our file" '[[ ! -e $tmp/etc/polkit-1 ]]'
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# No configuration at all.
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check "an unknown service is refused" '! fu_pam_enable nosuchservice 2>/dev/null'
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# ---------------------------------------------------------------------------
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# Through real PAM
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# ---------------------------------------------------------------------------
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harness="$here/build/pam_harness"
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if [[ -x $harness ]]; then
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mkdir -p "$tmp/real/vendor" "$tmp/real/etc"
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printf 'auth required pam_permit.so\naccount required pam_permit.so\n' > "$tmp/real/vendor/svc"
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FU_PAM_ETC_DIR="$tmp/real/etc"
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FU_PAM_VENDOR_DIRS=("$tmp/real/vendor")
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FU_PAM_MODULE="$tmp/real/missing/pam_face_unlock.so"
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mkdir -p "$tmp/real/missing" && : > "$FU_PAM_MODULE"
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fu_pam_enable svc
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rm -f "$FU_PAM_MODULE"
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check "a missing module is skipped, the rest of the stack still decides" '"$harness" "$tmp/real/etc" svc "$(id -un)" > /dev/null 2>&1'
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printf 'auth required pam_deny.so\n' > "$tmp/real/vendor/svc"
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check "and a stack that says no still says no" '! "$harness" "$tmp/real/etc" svc "$(id -un)" > /dev/null 2>&1'
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else
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printf 'skip real PAM checks (build pam_harness first)\n'
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fi
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printf '\n%s\n' "$( (( failures )) && echo "SOME CHECKS FAILED" || echo "all checks passed")"
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(( failures == 0 ))
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