Improve domain enrollment and desktop personalization

2026-09-07 15:07:04 -06:00
parent c737bd3192
commit 9f32ed2cb1
30 changed files with 1259 additions and 51 deletions
@@ -0,0 +1,249 @@
+#!/usr/bin/env bash
+# Generates and applies the SGU welcome wallpaper inside a Linux desktop session.
+# It is intentionally best-effort: unavailable AD metadata or desktop APIs must
+# never delay or prevent the user's session from opening.
+
+set -uo pipefail
+
+CONFIG_PATH=${SGU_WELCOME_CONFIG:-/etc/sgu/welcome-wallpaper.conf}
+INSTALL_ROOT=${SGU_WELCOME_ROOT:-/usr/local/lib/sgu-welcome-wallpaper}
+BASE_IMAGE=${SGU_WELCOME_BASE_IMAGE:-${INSTALL_ROOT}/darkblue.jpg}
+
+if [[ -r $CONFIG_PATH ]]; then
+    # The root-owned file contains only deployment metadata, never credentials.
+    # shellcheck source=/dev/null
+    source "$CONFIG_PATH"
+fi
+
+DOMAIN_CONTROLLER=${DOMAIN_CONTROLLER:-}
+DOMAIN_NAME=${DOMAIN_NAME:-}
+BASE_DN=${BASE_DN:-}
+state_root=${XDG_STATE_HOME:-${HOME}/.local/state}
+wallpaper_root=${XDG_CACHE_HOME:-${HOME}/.cache}/sgu/wallpapers
+log_path="${state_root}/sgu/welcome-wallpaper.log"
+
+log_message() {
+    mkdir -p "$(dirname "$log_path")" 2>/dev/null || true
+    printf '%s %s\n' "$(date --iso-8601=seconds 2>/dev/null || date)" "$*" >>"$log_path" 2>/dev/null || true
+}
+
+fail_softly() {
+    log_message "ERROR $*"
+    exit 0
+}
+
+[[ -r $BASE_IMAGE ]] || fail_softly "Missing base image: $BASE_IMAGE"
+
+if command -v magick >/dev/null 2>&1; then
+    image_command=(magick)
+elif command -v convert >/dev/null 2>&1; then
+    image_command=(convert)
+else
+    fail_softly 'ImageMagick is unavailable.'
+fi
+
+raw_user=${USER:-$(id -un 2>/dev/null || printf user)}
+account_name=${raw_user%@*}
+account_name=${account_name##*\\}
+display_name=$(getent passwd "$raw_user" 2>/dev/null | awk -F: 'NR == 1 { split($5,a,","); print a[1] }')
+[[ -n $display_name ]] || display_name=$account_name
+
+computer_name=$(hostname -s 2>/dev/null || true)
+computer_name=${computer_name^^}
+location=''
+distinguished_name=''
+organizational_unit=''
+
+read_ldif_value() {
+    local attribute=$1
+    local content=$2
+    local line value
+    line=$(printf '%s\n' "$content" | awk -v name="$attribute" '
+        BEGIN { IGNORECASE=1 }
+        index(tolower($0), tolower(name) ":") == 1 { print; exit }
+    ')
+    [[ -n $line ]] || return 0
+    if [[ $line == "${attribute}:: "* || ${line,,} == "${attribute,,}:: "* ]]; then
+        value=${line#*:: }
+        printf '%s' "$value" | base64 --decode 2>/dev/null || true
+    else
+        printf '%s' "${line#*: }"
+    fi
+}
+
+# SSSD normally obtains a Kerberos ticket during PAM authentication. Use that
+# ticket for a read-only AD query; never embed a bind password in this helper.
+if [[ -n $DOMAIN_CONTROLLER && -n $BASE_DN ]] &&
+   command -v ldapsearch >/dev/null 2>&1 &&
+   command -v klist >/dev/null 2>&1 && klist -s; then
+    ldap_server=$DOMAIN_CONTROLLER
+    if [[ -n $DOMAIN_NAME ]] && command -v resolvectl >/dev/null 2>&1; then
+        discovered_server=$(resolvectl query --type=SRV \
+            "_ldap._tcp.dc._msdcs.${DOMAIN_NAME}" 2>/dev/null |
+            awk '/ IN SRV / { for (i=1; i<=NF; i++) if ($i == "SRV") { print $(i+4); exit } }' |
+            sed 's/\.$//' || true)
+        [[ -n $discovered_server ]] && ldap_server=$discovered_server
+    elif [[ -n $DOMAIN_NAME ]] && command -v dig >/dev/null 2>&1; then
+        discovered_server=$(dig +short SRV "_ldap._tcp.dc._msdcs.${DOMAIN_NAME}" 2>/dev/null |
+            awk 'NR == 1 { print $4 }' | sed 's/\.$//' || true)
+        [[ -n $discovered_server ]] && ldap_server=$discovered_server
+    fi
+    ldap_result=$(ldapsearch -LLL -N -o ldif-wrap=no -Y GSSAPI \
+        -H "ldap://${ldap_server}" -b "$BASE_DN" \
+        "(&(objectCategory=computer)(sAMAccountName=${computer_name}\\24))" \
+        location distinguishedName 2>/dev/null || true)
+    location=$(read_ldif_value location "$ldap_result")
+    distinguished_name=$(read_ldif_value distinguishedName "$ldap_result")
+    if [[ $distinguished_name =~ ,OU=([^,]+) ]]; then
+        organizational_unit=${BASH_REMATCH[1]}
+        organizational_unit=${organizational_unit//\\,/,}
+        organizational_unit=${organizational_unit//\\=/=}
+        organizational_unit=${organizational_unit//\\+/+}
+    fi
+
+    # SSSD's GECOS field is not guaranteed to expose AD displayName. Query it
+    # through the same authenticated LDAP session and retain the account-name
+    # fallback when the institutional identifier contains unexpected symbols.
+    if [[ $account_name =~ ^[A-Za-z0-9._-]+$ ]]; then
+        user_result=$(ldapsearch -LLL -N -o ldif-wrap=no -Y GSSAPI \
+            -H "ldap://${ldap_server}" -b "$BASE_DN" \
+            "(&(objectCategory=person)(objectClass=user)(sAMAccountName=${account_name}))" \
+            displayName 2>/dev/null || true)
+        directory_display_name=$(read_ldif_value displayName "$user_result")
+        [[ -n $directory_display_name ]] && display_name=$directory_display_name
+    fi
+else
+    log_message 'WARN AD metadata query skipped because Kerberos or LDAP session data was unavailable.'
+fi
+
+article_for() {
+    local value=${1,,}
+    case "$value" in
+        sala*|aula*|facultad*|unidad*|biblioteca*|oficina*|coordinación*) printf la ;;
+        laboratorio*|centro*|edificio*|campus*|taller*|auditorio*) printf el ;;
+        *) printf '' ;;
+    esac
+}
+
+with_article() {
+    local value=$1
+    local article
+    article=$(article_for "$value")
+    if [[ -n $article ]]; then
+        printf '%s %s' "$article" "$value"
+    else
+        printf '%s' "$value"
+    fi
+}
+
+if [[ -n $location && -n $organizational_unit ]]; then
+    room_phrase=$(with_article "$location")
+    ou_article=$(article_for "$organizational_unit")
+    if [[ $ou_article == el ]]; then
+        ou_phrase="del ${organizational_unit}"
+    elif [[ -n $ou_article ]]; then
+        ou_phrase="de ${ou_article} ${organizational_unit}"
+    else
+        ou_phrase="de ${organizational_unit}"
+    fi
+    location_text="Estás ubicado en ${room_phrase} ${ou_phrase}."
+elif [[ -n $location ]]; then
+    location_text="Estás ubicado en $(with_article "$location")."
+elif [[ -n $organizational_unit ]]; then
+    location_text="Estás ubicado en $(with_article "$organizational_unit")."
+else
+    location_text='Bienvenido al Laboratorio de Cómputo de Ingeniería.'
+fi
+
+width=1600
+height=1000
+if command -v xrandr >/dev/null 2>&1; then
+    geometry=$(xrandr --current 2>/dev/null | awk '/\*/ { print $1; exit }')
+    if [[ $geometry =~ ^([0-9]+)x([0-9]+)$ ]]; then
+        width=${BASH_REMATCH[1]}
+        height=${BASH_REMATCH[2]}
+    fi
+fi
+
+mkdir -p "$wallpaper_root" "$(dirname "$log_path")" ||
+    fail_softly "Cannot create welcome wallpaper state directories."
+safe_computer=${computer_name//[^A-Za-z0-9_.-]/_}
+output_path="${wallpaper_root}/welcome-${safe_computer}.jpg"
+scale=$(( height * 100 / 1000 ))
+(( scale > 45 )) || scale=45
+welcome_size=$(( 34 * scale / 100 ))
+name_size=$(( 70 * scale / 100 ))
+location_size=$(( 27 * scale / 100 ))
+panel_width=$(( width * 76 / 100 ))
+panel_height=$(( 310 * scale / 100 ))
+panel_x1=$(( (width - panel_width) / 2 ))
+panel_y1=$(( height / 2 - panel_height / 2 ))
+panel_x2=$(( panel_x1 + panel_width ))
+panel_y2=$(( panel_y1 + panel_height ))
+
+sans_font='DejaVu-Sans'
+serif_font='DejaVu-Serif'
+if [[ -r ${INSTALL_ROOT}/fonts/IndivisaTextSans-Bold.otf ]]; then
+    sans_font="${INSTALL_ROOT}/fonts/IndivisaTextSans-Bold.otf"
+fi
+if [[ -r ${INSTALL_ROOT}/fonts/IndivisaTextSerif-BoldItalic.otf ]]; then
+    serif_font="${INSTALL_ROOT}/fonts/IndivisaTextSerif-BoldItalic.otf"
+fi
+if [[ $sans_font == DejaVu-Sans ]] && command -v fc-list >/dev/null 2>&1; then
+    if fc-list : family | grep -Fqi 'Indivisa Text Sans'; then
+        sans_font='Indivisa Text Sans'
+    elif fc-list : family | grep -Fqi 'Indivisa Text'; then
+        sans_font='Indivisa Text'
+    fi
+fi
+if [[ $serif_font == DejaVu-Serif ]] && command -v fc-list >/dev/null 2>&1; then
+    if fc-list : family | grep -Fqi 'Indivisa Text Serif'; then
+        serif_font='Indivisa Text Serif'
+    elif fc-list : family | grep -Fqi 'Indivisa Serif'; then
+        serif_font='Indivisa Serif'
+    fi
+fi
+
+if ! "${image_command[@]}" "$BASE_IMAGE" \
+    -resize "${width}x${height}^" -gravity center -extent "${width}x${height}" \
+    -fill 'rgba(0,13,58,0.30)' -draw "rectangle ${panel_x1},${panel_y1} ${panel_x2},${panel_y2}" \
+    -gravity center \
+    -font "$sans_font" -weight 700 -style Normal -pointsize "$welcome_size" \
+    -fill '#D3E2FF' -stroke 'rgba(0,0,0,0.48)' -strokewidth 1 \
+    -annotate "+0-$(( 92 * scale / 100 ))" 'Bienvenido,' \
+    -font "$serif_font" -weight 700 -style Italic -pointsize "$name_size" \
+    -fill white -annotate "+0-$(( 22 * scale / 100 ))" "$display_name" \
+    -font "$sans_font" -weight 400 -style Normal -pointsize "$location_size" \
+    -fill '#D3E2FF' -annotate "+0+$(( 88 * scale / 100 ))" "$location_text" \
+    -quality 94 "$output_path" 2>>"$log_path"; then
+    fail_softly 'ImageMagick could not render the welcome wallpaper.'
+fi
+
+applied=false
+if command -v gsettings >/dev/null 2>&1; then
+    if gsettings list-schemas 2>/dev/null | grep -Fxq 'org.cinnamon.desktop.background'; then
+        gsettings set org.cinnamon.desktop.background picture-uri "file://${output_path}" >/dev/null 2>&1 || true
+        gsettings set org.cinnamon.desktop.background picture-options zoom >/dev/null 2>&1 || true
+        applied=true
+    fi
+    if gsettings list-schemas 2>/dev/null | grep -Fxq 'org.gnome.desktop.background'; then
+        gsettings set org.gnome.desktop.background picture-uri "file://${output_path}" >/dev/null 2>&1 || true
+        gsettings set org.gnome.desktop.background picture-uri-dark "file://${output_path}" >/dev/null 2>&1 || true
+        gsettings set org.gnome.desktop.background picture-options zoom >/dev/null 2>&1 || true
+        applied=true
+    fi
+fi
+
+if [[ $applied == false ]] && command -v xfconf-query >/dev/null 2>&1; then
+    while IFS= read -r property; do
+        xfconf-query -c xfce4-desktop -p "$property" -s "$output_path" >/dev/null 2>&1 || true
+        applied=true
+    done < <(xfconf-query -c xfce4-desktop -l 2>/dev/null | grep '/last-image$' || true)
+fi
+
+if [[ $applied == true ]]; then
+    log_message "OK computer=${computer_name}; location=$([[ -n $location ]] && printf true || printf false); ou=$([[ -n $organizational_unit ]] && printf true || printf false); output=${output_path}"
+else
+    log_message 'WARN Wallpaper rendered, but no supported desktop background API was found.'
+fi
+exit 0