diff --git a/.vscode/settings.json b/.vscode/settings.json index 9bcdc96..54351d7 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -109,7 +109,9 @@ "memory_resource": "cpp", "numeric": "cpp", "string_view": "cpp", - "numbers": "cpp" + "numbers": "cpp", + "ip_hashmap.h": "c", + "client_msg.h": "c" }, "C_Cpp.errorSquiggles": "enabled" } diff --git a/linux_kernel/.msg.o.d b/linux_kernel/.msg.o.d index b2f0ea5..5b8561a 100644 --- a/linux_kernel/.msg.o.d +++ b/linux_kernel/.msg.o.d @@ -358,4 +358,7 @@ msg.o: /home/duck/project/linux_kernel/msg.c \ include/uapi/linux/udp.h include/linux/inet.h include/linux/cdev.h \ /home/duck/project/linux_kernel/some_struct.h \ /home/duck/project/linux_kernel/global.h \ - /home/duck/project/linux_kernel/msg.h + /home/duck/project/linux_kernel/msg.h \ + /home/duck/project/linux_kernel/ip_hashmap.h \ + /home/duck/project/linux_kernel/network.h \ + /home/duck/project/linux_kernel/client_msg.h diff --git a/linux_kernel/Makefile b/linux_kernel/Makefile index fd56a15..b1e01ca 100644 --- a/linux_kernel/Makefile +++ b/linux_kernel/Makefile @@ -1,6 +1,6 @@ CONFIG_MODULE_SIG=n obj-m += safe_duck.o -safe_duck-objs := main.o msg.o global.o some_struct.o +safe_duck-objs := main.o msg.o global.o some_struct.o ip_hashmap.o network.o client_msg.o PWD := $(shell pwd) KVER := $(shell uname -r) KDIR := /lib/modules/$(KVER)/build diff --git a/linux_kernel/Module.symvers b/linux_kernel/Module.symvers index a5199a5..b61bee4 100644 --- a/linux_kernel/Module.symvers +++ b/linux_kernel/Module.symvers @@ -1,5 +1,5 @@ -0x8d232039 push_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL -0x4b7cb975 get_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL +0xe98895fa push_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL +0xb1b3bd13 get_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0xb3ceb32b get_msg_list_length /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0x38a1fb31 cleanup_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0x50632040 init_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL diff --git a/linux_kernel/client_msg.c b/linux_kernel/client_msg.c new file mode 100644 index 0000000..d5eb52b --- /dev/null +++ b/linux_kernel/client_msg.c @@ -0,0 +1,14 @@ +#include "client_msg.h" + +void dispath_client_msg(struct client_msg_t* msg) { + switch (msg->type) { + case SD_MSG_TYPE_CLIENT_BLOCK_IP: + const size_t target_ip_address = msg->u.ip_address.src_ip; + const size_t block_time = msg->u.ip_address.block_time; + block_ip_address(target_ip_address, block_time); + break; + default: + printk(KERN_INFO "Unknown msg type: %d\n", msg->type); + break; + } +} diff --git a/linux_kernel/client_msg.h b/linux_kernel/client_msg.h new file mode 100644 index 0000000..babd0d1 --- /dev/null +++ b/linux_kernel/client_msg.h @@ -0,0 +1,3 @@ +#pragma once +#include "head.h" +extern void dispath_client_msg(struct client_msg_t* msg); diff --git a/linux_kernel/head.h b/linux_kernel/head.h index 7070c89..a6b177f 100644 --- a/linux_kernel/head.h +++ b/linux_kernel/head.h @@ -20,9 +20,15 @@ #include #include #include +#include +#include +#include #include "some_struct.h" #include "global.h" #include "msg.h" +#include "ip_hashmap.h" +#include "network.h" +#include "client_msg.h" #define DEVICE_NAME "safe_duck" #define DEVICE_CNT 1 MODULE_LICENSE("GPL"); diff --git a/linux_kernel/ip_hashmap.c b/linux_kernel/ip_hashmap.c new file mode 100644 index 0000000..8ed515c --- /dev/null +++ b/linux_kernel/ip_hashmap.c @@ -0,0 +1,173 @@ +#include "ip_hashmap.h" +static struct ip_hash_table g_ip_hashtable; + +void thread_demon_ip_hashmap(void *ctx) { + struct hlist_head *head; + struct hlist_node *node, *tmp; + struct ip_hashmap_node_t *data; + + while (!kthread_should_stop()) { + msleep_interruptible(30000); // 每 30 秒执行一次清理操作 + const s64 current_time_sec = ktime_get_real_seconds(); + + spin_lock(&g_ip_hashtable.lock); + + for (int i = 0; i < g_ip_hashtable.bucket_num; ++i) { + head = &g_ip_hashtable.heads[i]; + hlist_for_each_safe(node, tmp, head) { + data = container_of(node, struct ip_hashmap_node_t, node); + if (data) { + s64 time_diff = + (s64)((s64)data->info.ip_meta_info.remove_time - + (s64)data->info.ip_meta_info.last_attack_time); + if ((data->info.ip_meta_info.is_attack == false) || + (time_diff <= 0)) { + hlist_del(&data->node); + kfree(data); + } + } + } + } + + spin_unlock(&g_ip_hashtable.lock); + } + + printk(KERN_INFO "cleanup_iphashmap thread stopped\n"); +} +// 初始化哈希表对象 +bool init_ip_hashmap(void) { + struct ip_hash_table *table = &g_ip_hashtable; + table->bucket_num = BUCKET_NUM; + table->heads = kzalloc(BUCKET_NUM * sizeof(struct hlist_head), GFP_KERNEL); + if (table->heads) { + for (int i = 0; i < BUCKET_NUM; ++i) { + INIT_HLIST_HEAD(&table->heads[i]); + } + } + spin_lock_init(&table->lock); // 初始化锁 + + // 新建线程，执行清理操作 + table->cleanup_thread = kthread_run((void *)thread_demon_ip_hashmap, NULL, + "thread_demon_ip_hashmap"); + if (IS_ERR(table->cleanup_thread)) { + printk(KERN_ERR "Failed to create cleanup thread\n"); + return false; + } + return true; +} + +// 检查是否需要动态调整桶的数量 +void check_resize_table(struct ip_hash_table *table) { + unsigned int bucket_num = table->bucket_num; + int count = 0; + for (int i = 0; i < bucket_num; ++i) { + struct hlist_head *head = &table->heads[i]; + if (!hlist_empty(head)) { + count++; + } + } + + if ((count * 100 / bucket_num) > 70) { + table->bucket_num = 2 * bucket_num; + struct hlist_head *new_heads = + kzalloc(table->bucket_num * sizeof(struct hlist_head), GFP_KERNEL); + if (new_heads) { + for (int i = 0; i < table->bucket_num / 2; ++i) { + struct hlist_node *node, *tmp; + hlist_for_each_safe(node, tmp, &table->heads[i]) { + struct ip_hashmap_node_t *data = + container_of(node, struct ip_hashmap_node_t, node); + hlist_del(&data->node); + int idx = + hash_32(data->info.ip_address_key, table->bucket_num); + hlist_add_head(&data->node, &new_heads[idx]); + } + } + + kfree(table->heads); + table->heads = new_heads; + } + } +} + +// 获取并插入哈希表节点 +void put_ipdata_by_hashmap(size_t ip_address_key, + struct ip_hashmap_info *info) { + struct ip_hash_table *table = &g_ip_hashtable; + int idx = hash_32(ip_address_key, table->bucket_num); + // 新建哈希表节点 + struct ip_hashmap_node_t *data = + kmalloc(sizeof(struct ip_hashmap_node_t), GFP_KERNEL); + if (data) { + memcpy(&data->info, info, sizeof(struct ip_hashmap_info)); + spin_lock(&table->lock); + hlist_add_head(&data->node, &table->heads[idx]); + check_resize_table(table); + spin_unlock(&table->lock); + } +} + +// 通过关键字获取哈希表节点 +struct ip_hashmap_node_t *get_ipdata_by_hashmap(size_t ip_address_key) { + struct ip_hash_table *table = &g_ip_hashtable; + spin_lock(&table->lock); + + int idx = hash_32(ip_address_key, table->bucket_num); + struct hlist_head *head = &table->heads[idx]; + struct hlist_node *node = head->first; + while (node) { + struct ip_hashmap_node_t *data = + container_of(node, struct ip_hashmap_node_t, node); + if (ip_address_key == data->info.ip_address_key) { + spin_unlock(&table->lock); + return data; + } + node = node->next; + } + spin_unlock(&table->lock); + return NULL; +} + +// 从哈希表中删除节点 +void del_ipdata_by_hashmap(size_t ip_address_key) { + struct ip_hash_table *table = &g_ip_hashtable; + spin_lock(&table->lock); + + int idx = hash_32(ip_address_key, table->bucket_num); + struct hlist_head *head = &table->heads[idx]; + struct hlist_node *node = head->first; + while (node) { + struct ip_hashmap_node_t *data = + container_of(node, struct ip_hashmap_node_t, node); + if (ip_address_key == data->info.ip_address_key) { + hlist_del(&data->node); + kfree(data); + break; + } + node = node->next; + } + // 检查是否需要调整桶的数量 + check_resize_table(table); + spin_unlock(&table->lock); +} +void cleanup_iphashmap(void) { + kthread_stop(g_ip_hashtable.cleanup_thread); // 停止清理线程 + if (g_ip_hashtable.heads) { + spin_lock(&g_ip_hashtable.lock); + struct hlist_head *head, *tmp; + struct hlist_node *node; + struct ip_hashmap_node_t *data; + // 释放哈希表节点动态分配的内存 + for (int i = 0; i < g_ip_hashtable.bucket_num; ++i) { + head = &g_ip_hashtable.heads[i]; + hlist_for_each_entry_safe(data, node, head, node) { + hlist_del(&data->node); + kfree(data); + } + } + kfree(g_ip_hashtable.heads); + spin_unlock(&g_ip_hashtable.lock); + } + + printk(KERN_INFO "clean up iphashmap\n"); +} diff --git a/linux_kernel/ip_hashmap.h b/linux_kernel/ip_hashmap.h new file mode 100644 index 0000000..f3073b3 --- /dev/null +++ b/linux_kernel/ip_hashmap.h @@ -0,0 +1,41 @@ +#pragma once +#include "head.h" +#define BUCKET_NUM 1000 // 初始桶的数量 +struct ip_hash_table { + struct hlist_head *heads; // 存放桶的指针数组 + unsigned int bucket_num; // 当前桶的数量 + spinlock_t lock; // 锁，确保同步和互斥访问哈希表 + struct task_struct *cleanup_thread; // 执行清理操作的线程 +}; +// 定义哈希表节点 +struct syn_scan_info_t { + size_t last_seen; + size_t num_syn_packets; +}; + +struct crack_ip_info_t { + size_t last_seen; + size_t num_connect; +}; +struct ip_meta_info_t { + bool is_attack; + size_t last_attack_time; + size_t remove_time; +}; +struct ip_hashmap_info { + size_t ip_address_key; + struct syn_scan_info_t syn_scan_info; + struct crack_ip_info_t crack_ip_info; + struct ip_meta_info_t ip_meta_info; +}; +struct ip_hashmap_node_t { + struct hlist_node node; // 哈希表链表节点 + struct ip_hashmap_info info; +}; +extern bool init_ip_hashmap(void); +extern void check_resize_table(struct ip_hash_table *table); +extern void put_ipdata_by_hashmap(size_t ip_address_key, + struct ip_hashmap_info *info); +extern struct ip_hashmap_node_t *get_ipdata_by_hashmap(size_t ip_address_key); +extern void del_ipdata_by_hashmap(size_t ip_address_key); +extern void cleanup_iphashmap(void); diff --git a/linux_kernel/main.c b/linux_kernel/main.c index 5dcf613..e627626 100644 --- a/linux_kernel/main.c +++ b/linux_kernel/main.c @@ -1,36 +1,5 @@ #include "head.h" -struct safe_duck_dev { - wait_queue_head_t read_wait; -}; - -unsigned int network_callback(const struct nf_hook_ops *ops, - struct sk_buff *skb, const struct net_device *in, - const struct net_device *out, - int (*okfn)(struct sk_buff *)) { - do { - if (skb == NULL) { - break; - } - struct iphdr *ip_header = ip_hdr(skb); - - if (ip_header == NULL) { - break; - } - // push ip address to list - struct kernel_msg_t *msg = - kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL); - if (msg == NULL) { - printk(KERN_ERR "Failed to allocate memory for new msg\n"); - break; - } - msg->type = SD_MSG_TYPE_NEW_IP_CONNECT; - msg->u.poll_req.src_ip = ip_header->saddr; - push_msg(msg); - } while (false); - - return NF_ACCEPT; -} unsigned int driver_poll_callback(struct file *filep, struct poll_table_struct *wait) { unsigned int mask = 0; @@ -61,6 +30,32 @@ ssize_t safe_duck_read(struct file *file, char __user *buf, size_t count, return ret; } +ssize_t safe_duck_write(struct file *filp, const char __user *buf, size_t count, + loff_t *f_pos) { + if (count > sizeof(struct client_msg_t)) { + return -EINVAL; + } + struct client_msg_t *message = + kmalloc(sizeof(struct client_msg_t), GFP_KERNEL); + do { + if (message == NULL) { + printk(KERN_ERR "Failed to allocate memory for new msg\n"); + break; + } + if (copy_from_user(message, buf, sizeof(struct client_msg_t))) { + return -EFAULT; + } + if (message->check_sum != MSG_CHECK_SUM) { + printk(KERN_ERR "Invalid checksum\n"); + break; + } + dispath_client_msg(message); + } while (false); + if (message != NULL) { + kfree(message); + } + return count; +} int safe_duck_open(struct inode *inode, struct file *filep) { return 0; } bool build_dev(void) { int rc = alloc_chrdev_region(&g_driver_dev_build.devid, 0, DEVICE_CNT, @@ -71,6 +66,8 @@ bool build_dev(void) { printk("newchrled chr_dev region err\n"); return false; } + g_driver_dev_build.init_chrdev_region = true; + printk(KERN_WARNING "major:%d, minor:%d\n", g_driver_dev_build.major, g_driver_dev_build.minor); cdev_init(&g_driver_dev_build.cdev, &g_fops); @@ -80,16 +77,40 @@ bool build_dev(void) { if (IS_ERR(g_driver_dev_build.class)) { return false; } + g_driver_dev_build.init_cdev_add = true; g_driver_dev_build.device = device_create(g_driver_dev_build.class, NULL, g_driver_dev_build.devid, NULL, DEVICE_NAME); - return IS_ERR(g_driver_dev_build.device) == false; + const bool build_dev_success = IS_ERR(g_driver_dev_build.device) == false; + if (build_dev_success) { + g_driver_dev_build.init_device_create = true; + } + return build_dev_success; } void destory_dev(void) { - cdev_del(&g_driver_dev_build.cdev); - unregister_chrdev_region(g_driver_dev_build.devid, DEVICE_NAME); - device_destroy(g_driver_dev_build.class, g_driver_dev_build.devid); - class_destroy(g_driver_dev_build.class); + if (g_driver_dev_build.init_cdev_add) { + cdev_del(&g_driver_dev_build.cdev); + } + if (g_driver_dev_build.init_chrdev_region) { + unregister_chrdev_region(g_driver_dev_build.devid, DEVICE_NAME); + } + if (g_driver_dev_build.init_device_create) { + device_destroy(g_driver_dev_build.class, g_driver_dev_build.devid); + } + if (g_driver_dev_build.init_cdev_add) { + class_destroy(g_driver_dev_build.class); + } +} +int cleanup(void) { + if (g_driver_dev_build.init_netfilter) { + nf_unregister_net_hook(&init_net, &g_network_hook_ops); + } + if (g_driver_dev_build.init_hashmap) { + cleanup_iphashmap(); + } + destory_dev(); + cleanup_msg(); + return -1; } static int __init driver_entry(void) { printk(KERN_WARNING "[DebugMessage] safe duck init\n"); @@ -99,21 +120,25 @@ static int __init driver_entry(void) { printk(KERN_ERR "Failed to build device\n"); return -1; } + if (init_ip_hashmap() == false) { + printk(KERN_ERR "Failed to init ip hashmap\n"); + return cleanup(); + } + g_driver_dev_build.init_hashmap = true; init_msg(); int rc = nf_register_net_hook(&init_net, &g_network_hook_ops); if (rc < 0) { printk(KERN_ERR "Failed to register network hook: %d\n", rc); - return rc; + return cleanup(); } + g_driver_dev_build.init_netfilter = true; printk(KERN_WARNING "[DebugMessage] safe duck init success \n"); return 0; } static void __exit driver_exit(void) { printk(KERN_INFO "[DebugMessage] safe duck exit\n"); - nf_unregister_net_hook(&init_net, &g_network_hook_ops); - cleanup_msg(); - destory_dev(); + cleanup(); } module_init(driver_entry); diff --git a/linux_kernel/msg.c b/linux_kernel/msg.c index d708eb9..2bbea57 100644 --- a/linux_kernel/msg.c +++ b/linux_kernel/msg.c @@ -5,6 +5,7 @@ size_t g_msg_length; void push_msg(struct kernel_msg_t *msg) { if (get_msg_list_length() > 0x1000) { printk(KERN_ERR "Too many messages in the list\n"); + kfree(msg); return; } struct msg_list *new_msg = kmalloc(sizeof(struct msg_list), GFP_KERNEL); @@ -22,6 +23,36 @@ void push_msg(struct kernel_msg_t *msg) { wake_up_interruptible(&g_r3_wait_queue); } } +void push_msg_new_ip_connect(size_t ip_address) { + struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL); + if (msg == NULL) { + printk(KERN_ERR "Failed to allocate memory for new msg\n"); + return; + } + msg->type = SD_MSG_TYPE_NEW_IP_CONNECT; + msg->u.ip_action.src_ip = ip_address; + push_msg(msg); +} +void push_msg_syn_attack(size_t ip_address) { + struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL); + if (msg == NULL) { + printk(KERN_ERR "Failed to allocate memory for new msg\n"); + return; + } + msg->type = SD_MSG_TYPE_SYN_ATTACK; + msg->u.ip_action.src_ip = ip_address; + push_msg(msg); +} +void push_msg_ssh_bf_attack(size_t ip_address) { + struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL); + if (msg == NULL) { + printk(KERN_ERR "Failed to allocate memory for new msg\n"); + return; + } + msg->type = SD_MSG_TYPE_SSH_BF_ATTACK; + msg->u.ip_action.src_ip = ip_address; + push_msg(msg); +} struct kernel_msg_t *get_msg(void) { struct kernel_msg_t *msg = NULL; struct msg_list *tmp = NULL; diff --git a/linux_kernel/msg.h b/linux_kernel/msg.h index 8a814aa..c1e90d8 100644 --- a/linux_kernel/msg.h +++ b/linux_kernel/msg.h @@ -4,6 +4,9 @@ typedef enum _msg_type { SD_MSG_TYPE_ERROR = -1, SD_MSG_TYPE_NEW_IP_CONNECT = 0, + SD_MSG_TYPE_SYN_ATTACK = 1, + SD_MSG_TYPE_CLIENT_BLOCK_IP = 2, + SD_MSG_TYPE_SSH_BF_ATTACK = 3, }; typedef struct kernel_msg_t { @@ -11,8 +14,18 @@ typedef struct kernel_msg_t { int type; union { struct { - unsigned int src_ip; - } poll_req; + unsigned long src_ip; + } ip_action; + } u; +}; +typedef struct client_msg_t { + unsigned long check_sum; + int type; + union { + struct { + unsigned long src_ip; + unsigned long block_time; + } ip_address; } u; }; typedef struct msg_list { @@ -25,3 +38,6 @@ extern struct kernel_msg_t *get_msg(void); extern size_t get_msg_list_length(void); extern void cleanup_msg(void); extern void init_msg(void); +extern void push_msg_syn_attack(size_t ip_address); +extern void push_msg_new_ip_connect(size_t ip_address); +extern void push_msg_ssh_bf_attack(size_t ip_address); diff --git a/linux_kernel/network.c b/linux_kernel/network.c new file mode 100644 index 0000000..23f6480 --- /dev/null +++ b/linux_kernel/network.c @@ -0,0 +1,161 @@ +#include "network.h" + +void block_ip_address(size_t ip_address, size_t time_sec) { + struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address); + const s64 current_time_sec = ktime_get_real_seconds(); + + if (data == NULL) { + struct ip_hashmap_info info; + info.ip_address_key = ip_address; + info.ip_meta_info.last_attack_time = current_time_sec; + info.ip_meta_info.remove_time = current_time_sec + time_sec; + info.ip_meta_info.is_attack = true; + put_ipdata_by_hashmap(ip_address, &info); + return; + } + data->info.ip_meta_info.last_attack_time = current_time_sec; + data->info.ip_meta_info.remove_time = current_time_sec + time_sec; + data->info.ip_meta_info.is_attack = true; +} +bool check_is_blacklist_ip(size_t ip_address) { + struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address); + if (data == NULL) { + printk(KERN_ERR "Failed to get ip data from hashmap\n"); + return false; + } + return data->info.ip_meta_info.is_attack; +} +bool check_syn_attack(struct iphdr *ip_header, struct sk_buff *skb) { + bool is_block = false; + do { + if (ip_header->protocol != IPPROTO_TCP) { + break; + } + struct tcphdr *tcp_header = tcp_hdr(skb); + if (tcp_header == NULL) { + break; + } + if (tcp_header->syn == 0 || tcp_header->ack || tcp_header->rst) { + break; + } + size_t ip_address_key = ip_header->saddr; + struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address_key); + const s64 current_time_sec = ktime_get_real_seconds(); + if (data == NULL) { + struct ip_hashmap_info info; + info.ip_address_key = ip_address_key; + info.syn_scan_info.last_seen = current_time_sec; + info.syn_scan_info.num_syn_packets = 1; + put_ipdata_by_hashmap(ip_address_key, &info); + break; + } + s64 time_diff = current_time_sec - data->info.syn_scan_info.last_seen; + if (time_diff >= SYN_SCAN_TIME) { + data->info.syn_scan_info.num_syn_packets = 0; + data->info.syn_scan_info.last_seen = current_time_sec; + break; + } + data->info.syn_scan_info.num_syn_packets++; + if (data->info.syn_scan_info.num_syn_packets >= SYN_SCAN_THRESHOLD) { + // printk(KERN_ERR "SYN attack detected from %pI4 num packet: %d + // \n", + // &ip_header->saddr, + // data->info.syn_scan_info.num_syn_packets); + push_msg_syn_attack(ip_address_key); + block_ip_address(ip_address_key, IP_ATTCK_BLOCK_TIME); + is_block = true; + } + + } while (false); + return is_block; +} + +bool check_ssh_brute_force_attack(struct iphdr *ip_header, + struct sk_buff *skb) { + bool is_block = false; + do { + if (ip_header->protocol != IPPROTO_TCP) { + break; + } + struct tcphdr *tcp_header = tcp_hdr(skb); + if (tcp_header == NULL) { + break; + } + if ((tcp_header->syn == 1) && (tcp_header->ack == 0)) { + break; + } + // check port + if (ntohs(tcp_header->dest) != SSH_PORT) { + break; + } + size_t ip_address_key = ip_header->saddr; + struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address_key); + const s64 current_time_sec = ktime_get_real_seconds(); + if (data == NULL) { + struct ip_hashmap_info info; + info.ip_address_key = ip_address_key; + info.crack_ip_info.last_seen = current_time_sec; + info.crack_ip_info.num_connect = 1; + put_ipdata_by_hashmap(ip_address_key, &info); + break; + } + s64 time_diff = current_time_sec - data->info.crack_ip_info.last_seen; + if (time_diff >= SSH_BRUTE_FORCE_TIME) { + data->info.crack_ip_info.num_connect = 0; + data->info.crack_ip_info.last_seen = current_time_sec; + break; + } + data->info.crack_ip_info.num_connect++; + if (data->info.crack_ip_info.num_connect >= SSH_BRUTE_FORCE_THRESHOLD) { + // printk(KERN_ERR "SYN attack detected from %pI4 num packet: %d + // \n", + // &ip_header->saddr, + // data->info.syn_scan_info.num_syn_packets); + push_msg_ssh_bf_attack(ip_address_key); + block_ip_address(ip_address_key, IP_ATTCK_BLOCK_TIME); + is_block = true; + } + + } while (false); + return is_block; +} +unsigned int network_callback(const struct nf_hook_ops *ops, + struct sk_buff *skb, const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)) { + bool is_block = false; + do { + if (skb == NULL) { + break; + } + struct iphdr *ip_header = ip_hdr(skb); + + if (ip_header == NULL) { + break; + } + if (check_is_blacklist_ip(ip_header->saddr)) { + is_block = true; + printk(KERN_ERR "Block ip address: %pI4\n", &ip_header->saddr); + break; + } + if (check_syn_attack(ip_header, skb)) { + is_block = true; + break; + } + if (check_ssh_brute_force_attack(ip_header, skb)) { + is_block = true; + break; + } + struct tcphdr *tcp_header = tcp_hdr(skb); + if (tcp_header == NULL) { + break; + } + if ((tcp_header->syn == 1) && (tcp_header->ack == 0)) { + // push ip address to list + push_msg_new_ip_connect(ip_header->saddr); + } + + } while (false); + + return is_block ? NF_DROP : NF_ACCEPT; +} diff --git a/linux_kernel/network.h b/linux_kernel/network.h new file mode 100644 index 0000000..a995e2d --- /dev/null +++ b/linux_kernel/network.h @@ -0,0 +1,15 @@ +#pragma once +#include "head.h" +#define IP_ATTCK_BLOCK_TIME 600 +#define SYN_SCAN_THRESHOLD 500 +#define SYN_SCAN_TIME 10 +#define SSH_BRUTE_FORCE_THRESHOLD 10 +#define SSH_BRUTE_FORCE_TIME 5 +#define SSH_PORT 22 +extern unsigned int network_callback(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct net_device *in, + const struct net_device *out, + int (*okfn)(struct sk_buff *)); +extern void block_ip_address(size_t ip_address, size_t time_sec); +extern bool check_is_blacklist_ip(size_t ip_address); diff --git a/linux_kernel/some_struct.c b/linux_kernel/some_struct.c index 074faf3..c08a7a5 100644 --- a/linux_kernel/some_struct.c +++ b/linux_kernel/some_struct.c @@ -14,4 +14,5 @@ struct file_operations g_fops = { .open = safe_duck_open, .release = safe_duck_release, .read = safe_duck_read, + .write = safe_duck_write, }; diff --git a/linux_kernel/some_struct.h b/linux_kernel/some_struct.h index 6f02d0b..175da2d 100644 --- a/linux_kernel/some_struct.h +++ b/linux_kernel/some_struct.h @@ -11,6 +11,8 @@ extern int safe_duck_open(struct inode *inode, struct file *filep); extern int safe_duck_release(struct inode *inode, struct file *file); extern ssize_t safe_duck_read(struct file *file, char __user *buf, size_t count, loff_t *pos); +extern ssize_t safe_duck_write(struct file *filp, const char __user *buf, + size_t count, loff_t *f_pos); struct _driver_dev_build { int major; int minor; @@ -18,6 +20,11 @@ struct _driver_dev_build { dev_t devid; // device num struct class *class; // class struct device *device; // device + bool init_chrdev_region; + bool init_cdev_add; + bool init_device_create; + bool init_netfilter; + bool init_hashmap; }; extern struct nf_hook_ops g_network_hook_ops; extern struct file_operations g_fops; diff --git a/linux_service/CMakeLists.txt b/linux_service/CMakeLists.txt index 87dc234..e777c4f 100644 --- a/linux_service/CMakeLists.txt +++ b/linux_service/CMakeLists.txt @@ -2,4 +2,4 @@ cmake_minimum_required(VERSION 3.10) project(safe_duck) -add_executable(safe_duck safe_duck.cpp) +add_executable(safe_duck safe_duck.cpp msg.cpp tools.cpp global.cpp) diff --git a/linux_service/build/build.sh b/linux_service/build.sh similarity index 93% rename from linux_service/build/build.sh rename to linux_service/build.sh index 901bad5..25c74d5 100755 --- a/linux_service/build/build.sh +++ b/linux_service/build.sh @@ -4,7 +4,8 @@ # 设定变量 MODULE_NAME=safe_duck TARGET_DIR="/run/user/1000/gvfs/smb-share:server=192.168.1.2,share=dev_share" - +cmake build; +cd build; # 编译模块 if make; then @@ -24,3 +25,4 @@ else echo "Failed to build ${MODULE_NAME}" fi +make clean diff --git a/linux_service/build/CMakeFiles/Makefile2 b/linux_service/build/CMakeFiles/Makefile2 index 3cd7d22..3b2aa88 100644 --- a/linux_service/build/CMakeFiles/Makefile2 +++ b/linux_service/build/CMakeFiles/Makefile2 @@ -81,12 +81,12 @@ clean: CMakeFiles/safe_duck.dir/clean CMakeFiles/safe_duck.dir/all: $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/depend $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/build - @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --progress-dir=/home/duck/project/linux_service/build/CMakeFiles --progress-num=1,2 "Built target safe_duck" + @$(CMAKE_COMMAND) -E cmake_echo_color --switch=$(COLOR) --progress-dir=/home/duck/project/linux_service/build/CMakeFiles --progress-num=1,2,3,4,5 "Built target safe_duck" .PHONY : CMakeFiles/safe_duck.dir/all # Build rule for subdir invocation for target. CMakeFiles/safe_duck.dir/rule: cmake_check_build_system - $(CMAKE_COMMAND) -E cmake_progress_start /home/duck/project/linux_service/build/CMakeFiles 2 + $(CMAKE_COMMAND) -E cmake_progress_start /home/duck/project/linux_service/build/CMakeFiles 5 $(MAKE) $(MAKESILENT) -f CMakeFiles/Makefile2 CMakeFiles/safe_duck.dir/all $(CMAKE_COMMAND) -E cmake_progress_start /home/duck/project/linux_service/build/CMakeFiles 0 .PHONY : CMakeFiles/safe_duck.dir/rule diff --git a/linux_service/build/CMakeFiles/progress.marks b/linux_service/build/CMakeFiles/progress.marks index 0cfbf08..7ed6ff8 100644 --- a/linux_service/build/CMakeFiles/progress.marks +++ b/linux_service/build/CMakeFiles/progress.marks @@ -1 +1 @@ -2 +5 diff --git a/linux_service/build/CMakeFiles/safe_duck.dir/DependInfo.cmake b/linux_service/build/CMakeFiles/safe_duck.dir/DependInfo.cmake index fa30ea8..7e9a56c 100644 --- a/linux_service/build/CMakeFiles/safe_duck.dir/DependInfo.cmake +++ b/linux_service/build/CMakeFiles/safe_duck.dir/DependInfo.cmake @@ -8,7 +8,10 @@ set(CMAKE_DEPENDS_LANGUAGES # The set of dependency files which are needed: set(CMAKE_DEPENDS_DEPENDENCY_FILES + "/home/duck/project/linux_service/global.cpp" "CMakeFiles/safe_duck.dir/global.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/global.cpp.o.d" + "/home/duck/project/linux_service/msg.cpp" "CMakeFiles/safe_duck.dir/msg.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/msg.cpp.o.d" "/home/duck/project/linux_service/safe_duck.cpp" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o.d" + "/home/duck/project/linux_service/tools.cpp" "CMakeFiles/safe_duck.dir/tools.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/tools.cpp.o.d" ) # Targets to which this target links. diff --git a/linux_service/build/CMakeFiles/safe_duck.dir/build.make b/linux_service/build/CMakeFiles/safe_duck.dir/build.make index adb6a84..2ae988e 100644 --- a/linux_service/build/CMakeFiles/safe_duck.dir/build.make +++ 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CMakeFiles/safe_duck.dir/msg.cpp.i +.PHONY : msg.cpp.i + +msg.s: msg.cpp.s +.PHONY : msg.s + +# target to generate assembly for a file +msg.cpp.s: + $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/msg.cpp.s +.PHONY : msg.cpp.s + safe_duck.o: safe_duck.cpp.o .PHONY : safe_duck.o @@ -153,6 +201,30 @@ safe_duck.cpp.s: $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/safe_duck.cpp.s .PHONY : safe_duck.cpp.s +tools.o: tools.cpp.o +.PHONY : tools.o + +# target to build an object file +tools.cpp.o: + $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/tools.cpp.o +.PHONY : tools.cpp.o + +tools.i: tools.cpp.i +.PHONY : tools.i + +# target to preprocess a source file +tools.cpp.i: + $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/tools.cpp.i +.PHONY : tools.cpp.i + +tools.s: tools.cpp.s +.PHONY : tools.s + +# target to generate assembly for a file +tools.cpp.s: + $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/tools.cpp.s +.PHONY : tools.cpp.s + # Help Target help: @echo "The following are some of the valid targets for this Makefile:" @@ -162,9 +234,18 @@ help: @echo "... edit_cache" @echo "... rebuild_cache" @echo "... safe_duck" + @echo "... global.o" + @echo "... global.i" + @echo "... global.s" + @echo "... msg.o" + @echo "... msg.i" + @echo "... msg.s" @echo "... safe_duck.o" @echo "... safe_duck.i" @echo "... safe_duck.s" + @echo "... tools.o" + @echo "... tools.i" + @echo "... tools.s" .PHONY : help diff --git a/linux_service/global.cpp b/linux_service/global.cpp new file mode 100644 index 0000000..6482a5f --- /dev/null +++ b/linux_service/global.cpp @@ -0,0 +1,2 @@ +#include "global.h" +namespace global {}; diff --git a/linux_service/global.h b/linux_service/global.h new file mode 100644 index 0000000..bd2d29a --- /dev/null +++ b/linux_service/global.h @@ -0,0 +1,3 @@ +#pragma once +#include "head.h" +namespace global {}; diff --git a/linux_service/head.h b/linux_service/head.h new file mode 100644 index 0000000..b289209 --- /dev/null +++ b/linux_service/head.h @@ -0,0 +1,10 @@ +#include +#include +#include +#include +#include +#include + +#include "global.h" +#include "msg.h" +#include "tools.h" diff --git a/linux_service/msg.cpp b/linux_service/msg.cpp new file mode 100644 index 0000000..a3e0f45 --- /dev/null +++ b/linux_service/msg.cpp @@ -0,0 +1,90 @@ +#include "msg.h" +namespace client_msg { +int driver_read; +int driver_write; +auto call_driver(client_msg_t msg) -> bool { + int is_success = write(driver_write, &msg, sizeof(client_msg_t)); + if (is_success == 0) { + perror("Failed to write message to safe_duck device"); + return false; + } + return true; +} +auto block_ip(size_t ip_address, size_t time_sec) -> bool { + client_msg_t msg; + msg.check_sum = MSG_CHECK_SUM; + msg.type = SD_MSG_TYPE_CLIENT_BLOCK_IP; + msg.u.ip_address.src_ip = ip_address; + msg.u.ip_address.block_time = time_sec; + return call_driver(msg); +} +auto dispath_kernel_msg_i(_msg_type type, kernel_msg_t msg) -> void { + switch (type) { + case SD_MSG_TYPE_NEW_IP_CONNECT: { + auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip); + printf("New IP connection: %s\n", ip_str.c_str()); + } break; + case SD_MSG_TYPE_SYN_ATTACK: { + auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip); + printf("Block ip for syn attack: %s \n", ip_str.c_str()); + } break; + case SD_MSG_TYPE_SSH_BF_ATTACK: { + auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip); + printf("Block ip for SSH brute force attack: %s \n", + ip_str.c_str()); + } break; + default: + printf("Unknown message type: %d\n", msg.type); + break; + } +} + +auto dispath_kernel_msg() -> void { + int fd = driver_read; + while (1) { + struct pollfd fds[1]; + fds[0].fd = fd; + fds[0].events = POLLIN; + printf("Waiting for message from safe_duck device...\n"); + int ret = poll(fds, 1, -1); + if (ret < 0) { + perror("poll failed"); + close(fd); + return; + } + printf("Got message from safe_duck device\n"); + if (fds[0].revents & POLLIN) { + kernel_msg_t msg; + int is_success = read(fd, &msg, sizeof(kernel_msg_t)); + if (is_success == 0 && msg.check_sum == MSG_CHECK_SUM) { + dispath_kernel_msg_i((_msg_type)msg.type, msg); + } else { + perror("Failed to read message from safe_duck device"); + } + } + } +} +auto init() -> bool { + driver_read = open("/dev/safe_duck", O_RDWR); + if (driver_read < 0) { + perror("Failed to open safe_duck device"); + return false; + } + driver_write = open("/dev/safe_duck", O_RDWR); + if (driver_write < 0) { + perror("Failed to open safe_duck device"); + return false; + } + return true; +} +auto uninstall() -> void { + if (driver_write) { + close(driver_write); + driver_write = 0; + } + if (driver_read) { + close(driver_read); + driver_read = 0; + } +} +} // namespace client_msg diff --git a/linux_service/msg.h b/linux_service/msg.h new file mode 100644 index 0000000..b5a1fda --- /dev/null +++ b/linux_service/msg.h @@ -0,0 +1,37 @@ +#pragma once +#include "head.h" +#define MSG_CHECK_SUM 1337 + +typedef enum _msg_type { + SD_MSG_TYPE_ERROR = -1, + SD_MSG_TYPE_NEW_IP_CONNECT = 0, + SD_MSG_TYPE_SYN_ATTACK = 1, + SD_MSG_TYPE_CLIENT_BLOCK_IP = 2, + SD_MSG_TYPE_SSH_BF_ATTACK = 3, +}; +typedef struct kernel_msg_t { + unsigned long check_sum; + int type; + union { + struct { + unsigned long src_ip; + } ip_action; + } u; +}; +typedef struct client_msg_t { + unsigned long check_sum; + int type; + union { + struct { + unsigned long src_ip; + unsigned long block_time; + } ip_address; + } u; +}; +namespace client_msg { +auto dispath_kernel_msg() -> void; +auto block_ip(size_t ip_address, size_t time_sec) -> bool; +auto init() -> bool; +auto call_driver(client_msg_t msg) -> bool; +auto uninstall() -> void; +} // namespace client_msg diff --git a/linux_service/safe_duck.cpp b/linux_service/safe_duck.cpp index 7877d93..c179d06 100644 --- a/linux_service/safe_duck.cpp +++ b/linux_service/safe_duck.cpp @@ -1,68 +1,8 @@ -#include -#include -#include -#include -#include -#include -#define MSG_CHECK_SUM 1337 -typedef enum _msg_type { - SD_MSG_TYPE_ERROR = -1, - SD_MSG_TYPE_NEW_IP_CONNECT = 0, -}; +#include "head.h" -typedef struct kernel_msg_t { - unsigned long check_sum; - int type; - union { - struct { - unsigned int src_ip; - } poll_req; - } u; -}; -auto cover_ip(unsigned int ip) -> std::string { - std::string ip_str; - ip_str = std::to_string(ip & 0xff) + "." + - std::to_string((ip >> 8) & 0xff) + "." + - std::to_string((ip >> 16) & 0xff) + "." + - std::to_string((ip >> 24) & 0xff); - return ip_str; -} -int main() { - int fd = open("/dev/safe_duck", O_RDWR); - if (fd < 0) { - perror("Failed to open safe_duck device"); - return 1; +auto main() -> int { + if (client_msg::init()) { + client_msg::dispath_kernel_msg(); } - - while (1) { - struct pollfd fds[1]; - fds[0].fd = fd; - fds[0].events = POLLIN; - printf("Waiting for message from safe_duck device...\n"); - int ret = poll(fds, 1, -1); - if (ret < 0) { - perror("poll failed"); - close(fd); - return 1; - } - printf("Got message from safe_duck device\n"); - if (fds[0].revents & POLLIN) { - kernel_msg_t msg; - int is_success = read(fd, &msg, sizeof(kernel_msg_t)); - if (is_success == 0 && msg.check_sum == MSG_CHECK_SUM) { - if (msg.type == SD_MSG_TYPE_NEW_IP_CONNECT) { - auto ip_str = cover_ip(msg.u.poll_req.src_ip); - printf("New IP connection: %s\n", ip_str.c_str()); - - } else { - printf("Unknown message type: %d\n", msg.type); - } - } else { - perror("Failed to read message from safe_duck device"); - } - } - } - - close(fd); return 0; } diff --git a/linux_service/tools.cpp b/linux_service/tools.cpp new file mode 100644 index 0000000..5abf958 --- /dev/null +++ b/linux_service/tools.cpp @@ -0,0 +1,11 @@ +#include "tools.h" +namespace tools { +auto cover_ip(unsigned int ip) -> std::string { + std::string ip_str; + ip_str = std::to_string(ip & 0xff) + "." + + std::to_string((ip >> 8) & 0xff) + "." + + std::to_string((ip >> 16) & 0xff) + "." + + std::to_string((ip >> 24) & 0xff); + return ip_str; +} +} // namespace tools diff --git a/linux_service/tools.h b/linux_service/tools.h new file mode 100644 index 0000000..9f6e86d --- /dev/null +++ b/linux_service/tools.h @@ -0,0 +1,5 @@ +#pragma once +#include "head.h" +namespace tools { +auto cover_ip(unsigned int ip) -> std::string; +} // namespace tools