commit de13437b471c0e5d2bb7f131cd5386b25c8d5792
Author: Andrés Felipe Marulanda Hernández <afmarulanda@noreply.example.org>
Date:   Tue Feb 25 15:49:18 2025 +0000

    Add ssh_key_checks

diff --git a/ssh_key_checks b/ssh_key_checks
new file mode 100644
index 0000000..0734e4f
--- /dev/null
+++ b/ssh_key_checks
@@ -0,0 +1,76 @@
+#!/bin/bash
+# se debe ejecutar con usuario root por el tema de persmisos del archivo authorized_keys
+
+# Obtener configuración de authorized_keys desde sshd_config
+AUTH_KEYS_PATH=$(grep -E "^\s*AuthorizedKeysFile" /etc/ssh/sshd_config | awk '{print $2}')
+
+# Si no está definido, usar el valor por defecto
+if [[ -z "$AUTH_KEYS_PATH" ]]; then
+    AUTH_KEYS_PATH=".ssh/authorized_keys"
+fi
+
+echo "Ruta configurada para authorized_keys: $AUTH_KEYS_PATH"
+echo "------------------------------------------------------------"
+printf "%-20s %-40s %-10s %-15s %-10s\n" "Usuario" "Ruta authorized_keys" "Permisos" "SSH Habilitado" "Llaves"
+echo "------------------------------------------------------------"
+
+# Obtener usuarios permitidos y denegados en sshd_config
+ALLOW_USERS=$(grep -E "^\s*AllowUsers" /etc/ssh/sshd_config | awk '{$1=""; print $0}')
+DENY_USERS=$(grep -E "^\s*DenyUsers" /etc/ssh/sshd_config | awk '{$1=""; print $0}')
+ALLOW_GROUPS=$(grep -E "^\s*AllowGroups" /etc/ssh/sshd_config | awk '{$1=""; print $0}')
+DENY_GROUPS=$(grep -E "^\s*DenyGroups" /etc/ssh/sshd_config | awk '{$1=""; print $0}')
+
+# Leer usuarios del sistema
+while IFS=: read -r username _ _ _ _ homedir _; do
+    # Omitir usuarios sin home válido o con home en lugares extraños
+    if [[ ! -d "$homedir" || "$homedir" =~ ^(/bin|/sbin|/usr|/var|/proc|/sys|/dev|/run|/nonexistent) ]]; then
+        continue
+    fi
+
+    # Determinar la ruta real de authorized_keys
+    user_keys_path="$homedir/$AUTH_KEYS_PATH"
+
+    # Verificar si el archivo existe
+    if [[ -f "$user_keys_path" ]]; then
+        permisos=$(stat -c "%a" "$user_keys_path")
+        num_llaves=$(grep -c "ssh-" "$user_keys_path")
+    else
+        permisos="No existe"
+        num_llaves=0
+    fi
+
+    # Determinar si el usuario puede hacer SSH
+    ssh_habilitado="Sí"
+    
+    if [[ -n "$ALLOW_USERS" && ! "$ALLOW_USERS" =~ "$username" ]]; then
+        ssh_habilitado="No"
+    fi
+    if [[ -n "$DENY_USERS" && "$DENY_USERS" =~ "$username" ]]; then
+        ssh_habilitado="No"
+    fi
+
+    # Si hay restricciones por grupo
+    user_groups=$(id -Gn "$username")
+    if [[ -n "$ALLOW_GROUPS" ]]; then
+        ssh_habilitado="No"
+        for group in $user_groups; do
+            if [[ "$ALLOW_GROUPS" =~ "$group" ]]; then
+                ssh_habilitado="Sí"
+                break
+            fi
+        done
+    fi
+    if [[ -n "$DENY_GROUPS" ]]; then
+        for group in $user_groups; do
+            if [[ "$DENY_GROUPS" =~ "$group" ]]; then
+                ssh_habilitado="No"
+            fi
+        done
+    fi
+
+    # Mostrar en pantalla
+    printf "%-20s %-40s %-10s %-15s %-10s\n" "$username" "$user_keys_path" "$permisos" "$ssh_habilitado" "$num_llaves"
+
+done < /etc/passwd
+
+echo "------------------------------------------------------------"
\ No newline at end of file