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zapret
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no demo no todo

pull/1667/head
ibrahimsql 1 day ago
parent
4bc2651ef2
commit
c6861598fd
8 changed files with 469 additions and 204 deletions
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  1. 75
      ebpf/Makefile
  2. 9
      ebpf/include/zapret_ebpf.h
  3. 4
      ebpf/loader/ebpf_manager.c
  4. 141
      ebpf/loader/zapret_loader.c
  5. 289
      ebpf/src/tls_fingerprint.bpf.c
  6. 131
      ebpf/src/zapret_filter.bpf.c
  7. 10
      nfq/protocol.c
  8. 4
      tpws/epoll-shim/src/epoll.c

75
ebpf/Makefile
View File

@ -70,14 +70,14 @@ LOADER_OBJS = $(LOADER_SRCS:.c=.o)
# Target executables # Target executables
TARGETS = zapret_ebpf_loader TARGETS = zapret_ebpf_loader
.PHONY: all clean install libbpf ebpf_programs user_space demo .PHONY: all clean install libbpf ebpf_programs user_space
ifeq ($(EBPF_SUPPORTED),yes) ifeq ($(EBPF_SUPPORTED),yes)
all: libbpf $(TARGETS) all: libbpf $(TARGETS)
@echo "Build complete for $(PLATFORM) platform with eBPF support" @echo "Build complete for $(PLATFORM) platform with eBPF support"
else else
all: demo all: user_space
@echo "Build complete for $(PLATFORM) platform (demo mode - no eBPF support)" @echo "Build complete for $(PLATFORM) platform"
endif endif
# Build libbpf (Linux only) # Build libbpf (Linux only)
@ -119,18 +119,10 @@ zapret_ebpf_loader: $(EBPF_OBJS) $(LOADER_OBJS) $(LIBBPF_OBJ)
$(CC) $(CFLAGS) $(LOADER_OBJS) $(LIBBPF_OBJ) -lelf -lz -o $@ $(CC) $(CFLAGS) $(LOADER_OBJS) $(LIBBPF_OBJ) -lelf -lz -o $@
else else
zapret_ebpf_loader: $(LOADER_OBJS) zapret_ebpf_loader: $(LOADER_OBJS)
$(CC) $(CFLAGS) $(LOADER_OBJS) $(LDFLAGS) -DDEMO_MODE -o $@ $(CC) $(CFLAGS) $(LOADER_OBJS) $(LDFLAGS) -o $@
endif endif
# Demo target for non-Linux platforms
demo: zapret_demo
zapret_demo:
@echo "CC zapret_demo (demo mode)"
@echo '#include <stdio.h>' > demo.c
@echo 'int main() { printf("Zapret demo for $(PLATFORM)\\n"); return 0; }' >> demo.c
@$(CC) $(CFLAGS) demo.c -o zapret_demo
@rm -f demo.c
install: all install: all
cp $(TARGETS) /usr/local/bin/ cp $(TARGETS) /usr/local/bin/
@ -147,29 +139,68 @@ distclean: clean
# Development targets # Development targets
format: format:
clang-format -i $(LOADER_SRCS) include/*.h @echo "Formatting source code..."
@if command -v clang-format >/dev/null 2>&1; then \
clang-format -i $(LOADER_SRCS) include/*.h src/*.c; \
echo "Code formatting completed"; \
else \
echo "clang-format not found, skipping formatting"; \
fi
check: check:
@echo "Checking eBPF programs..." @echo "Checking eBPF programs and source code..."
@echo "Checking syntax with clang..."
@for src in $(LOADER_SRCS); do \
echo "Checking $$src"; \
$(CC) $(CFLAGS) $(INCLUDES) -fsyntax-only $$src || exit 1; \
done
ifeq ($(EBPF_SUPPORTED),yes)
@echo "Verifying eBPF programs..."
@for prog in $(EBPF_OBJS); do \ @for prog in $(EBPF_OBJS); do \
if [ -f "$$prog" ]; then \
echo "Verifying $$prog"; \ echo "Verifying $$prog"; \
if command -v bpftool >/dev/null 2>&1; then \
bpftool prog load $$prog /sys/fs/bpf/test_$$prog 2>/dev/null && \ bpftool prog load $$prog /sys/fs/bpf/test_$$prog 2>/dev/null && \
bpftool prog del pinned /sys/fs/bpf/test_$$prog || true; \ bpftool prog del pinned /sys/fs/bpf/test_$$prog || true; \
else \
echo "bpftool not found, skipping eBPF verification"; \
fi; \
fi; \
done done
else
@echo "eBPF verification skipped (not supported on $(PLATFORM))"
endif
@echo "All checks completed"
# macOS target # macOS target
mac: demo mac: user_space
@echo "macOS build completed (demo mode)" @echo "macOS build completed"
# Help target # Help target
help: help:
@echo "Zapret eBPF Build System"
@echo "========================"
@echo "Platform: $(PLATFORM)"
@echo "eBPF Support: $(EBPF_SUPPORTED)"
@echo ""
@echo "Available targets:" @echo "Available targets:"
@echo " all - Build all eBPF programs and loader" @echo " all - Build all eBPF programs and loader"
@echo " mac - Build for macOS (demo mode)" @echo " mac - Build for macOS"
@echo " libbpf - Build libbpf dependency" @echo " libbpf - Build libbpf dependency (Linux only)"
@echo " install - Install binaries to system" @echo " install - Install binaries to system directories"
@echo " clean - Clean build artifacts" @echo " clean - Clean build artifacts"
@echo " distclean - Clean everything including dependencies" @echo " distclean - Clean everything including dependencies"
@echo " format - Format source code" @echo " format - Format source code with clang-format"
@echo " check - Verify eBPF programs" @echo " check - Verify eBPF programs and check syntax"
@echo " help - Show this help" @echo " help - Show this help message"
@echo ""
@echo "Build Configuration:"
@echo " CC = $(CC)"
@echo " CFLAGS = $(CFLAGS)"
@echo " INCLUDES = $(INCLUDES)"
@echo " LDFLAGS = $(LDFLAGS)"
@echo ""
@echo "Source Files:"
@echo " eBPF Programs: $(EBPF_SRCS)"
@echo " Loader Sources: $(LOADER_SRCS)"
@echo " Target: $(TARGETS)"

9
ebpf/include/zapret_ebpf.h
View File

@ -152,7 +152,10 @@ struct sni_encrypt_ctx {
uint8_t ech_supported; uint8_t ech_supported;
uint8_t esni_supported; uint8_t esni_supported;
uint8_t key[32]; /* Encryption key */ uint8_t key[32]; /* Encryption key */
uint8_t iv[16]; /* Initialization vector */ uint8_t key_len;
uint8_t iv[12];
uint8_t encrypted;
uint8_t padding[2];
}; };
/* Connection tracking entry */ /* Connection tracking entry */
@ -171,6 +174,7 @@ struct conn_track {
struct quic_conn_info quic_info; struct quic_conn_info quic_info;
struct fragment_ctx frag_ctx; struct fragment_ctx frag_ctx;
struct sni_encrypt_ctx sni_ctx; struct sni_encrypt_ctx sni_ctx;
struct conn_track *next; /* For hash table chaining */
}; };
/* Filter rule structure */ /* Filter rule structure */
@ -197,6 +201,9 @@ struct zapret_config {
uint8_t enable_packet_fragmentation; uint8_t enable_packet_fragmentation;
uint8_t enable_sni_encryption; uint8_t enable_sni_encryption;
uint8_t enable_performance_monitoring; uint8_t enable_performance_monitoring;
uint8_t use_netfilter;
uint8_t use_tc;
uint8_t use_raw_socket;
uint32_t max_connections; uint32_t max_connections;
uint32_t connection_timeout; uint32_t connection_timeout;
uint32_t fragment_threshold; uint32_t fragment_threshold;

4
ebpf/loader/ebpf_manager.c
View File

@ -62,7 +62,7 @@ struct conn_track* find_connection(uint32_t src_ip, uint32_t dst_ip, uint16_t sr
pthread_mutex_unlock(&conn_mutex); pthread_mutex_unlock(&conn_mutex);
return conn; return conn;
} }
conn = (struct conn_track*)conn->bytes_count; /* Using bytes_count as next pointer */ conn = conn->next; /* Proper linked list traversal */
} }
pthread_mutex_unlock(&conn_mutex); pthread_mutex_unlock(&conn_mutex);
@ -93,7 +93,7 @@ struct conn_track* create_connection(uint32_t src_ip, uint32_t dst_ip, uint16_t
pthread_mutex_lock(&conn_mutex); pthread_mutex_lock(&conn_mutex);
/* Insert at head of hash bucket */ /* Insert at head of hash bucket */
conn->bytes_count = (uint32_t)(uintptr_t)connection_table[hash]; conn->next = connection_table[hash];
connection_table[hash] = conn; connection_table[hash] = conn;
pthread_mutex_unlock(&conn_mutex); pthread_mutex_unlock(&conn_mutex);

141
ebpf/loader/zapret_loader.c
View File

@ -11,37 +11,9 @@
#include <signal.h> #include <signal.h>
#include <sys/resource.h> #include <sys/resource.h>
#ifdef DEMO_MODE #if defined(__linux__)
/* Demo mode - no eBPF dependencies */
#define BPF_PROG_TYPE_XDP 0
#define BPF_PROG_TYPE_SCHED_CLS 1
typedef struct { int fd; } bpf_object;
typedef struct { int fd; } bpf_program;
typedef struct { int fd; } bpf_map;
/* Stub functions for demo mode */
static inline int bpf_object__load(bpf_object *obj) { return 0; }
static inline void bpf_object__close(bpf_object *obj) { }
static inline bpf_program *bpf_object__find_program_by_name(bpf_object *obj, const char *name) { return NULL; }
static inline int bpf_program__fd(bpf_program *prog) { return -1; }
static inline bpf_map *bpf_object__find_map_by_name(bpf_object *obj, const char *name) { return NULL; }
static inline int bpf_map__fd(bpf_map *map) { return -1; }
#elif defined(__linux__)
#include <bpf/libbpf.h> #include <bpf/libbpf.h>
#include <bpf/bpf.h> #include <bpf/bpf.h>
#else
/* Non-Linux platforms - use demo mode */
#define DEMO_MODE
#define BPF_PROG_TYPE_XDP 0
#define BPF_PROG_TYPE_SCHED_CLS 1
typedef struct { int fd; } bpf_object;
typedef struct { int fd; } bpf_program;
typedef struct { int fd; } bpf_map;
static inline int bpf_object__load(bpf_object *obj) { return 0; }
static inline void bpf_object__close(bpf_object *obj) { }
static inline bpf_program *bpf_object__find_program_by_name(bpf_object *obj, const char *name) { return NULL; }
static inline int bpf_program__fd(bpf_program *prog) { return -1; }
static inline bpf_map *bpf_object__find_map_by_name(bpf_object *obj, const char *name) { return NULL; }
static inline int bpf_map__fd(bpf_map *map) { return -1; }
#endif #endif
#include <sys/socket.h> #include <sys/socket.h>
@ -50,6 +22,14 @@ static inline int bpf_map__fd(bpf_map *map) { return -1; }
#include <arpa/inet.h> #include <arpa/inet.h>
#include <pthread.h> #include <pthread.h>
#include <time.h> #include <time.h>
#ifdef __linux__
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <net/ethernet.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <libnetfilter_queue/libnetfilter_queue.h>
#endif
#include "../include/zapret_ebpf.h" #include "../include/zapret_ebpf.h"
/* Global state */ /* Global state */
@ -111,6 +91,44 @@ int randomize_tls_fingerprint(struct tls_fingerprint_compat *fp) {
return 0; return 0;
} }
/* Handle raw socket packet capture */
static int handle_raw_socket_packets(struct zapret_config *config) {
#ifdef __linux__
int sockfd;
struct sockaddr_ll addr;
socklen_t addr_len = sizeof(addr);
char buffer[65536];
ssize_t packet_len;
/* Create raw socket */
sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (sockfd < 0) {
fprintf(stderr, "Failed to create raw socket: %s\n", strerror(errno));
return -1;
}
printf("Raw socket packet capture started\n");
while (running) {
packet_len = recvfrom(sockfd, buffer, sizeof(buffer), 0,
(struct sockaddr*)&addr, &addr_len);
if (packet_len < 0) {
if (errno == EINTR) continue;
fprintf(stderr, "Raw socket receive error: %s\n", strerror(errno));
break;
}
/* Process the captured packet - simplified for now */
printf("Captured packet of %zd bytes\n", packet_len);
}
close(sockfd);
#else
printf("Raw socket capture not supported on this platform\n");
#endif
return 0;
}
/* QUIC connection analysis */ /* QUIC connection analysis */
int analyze_quic_packet(const uint8_t *data, size_t len, struct quic_conn_info_compat *quic) { int analyze_quic_packet(const uint8_t *data, size_t len, struct quic_conn_info_compat *quic) {
if (!data || len < 1 || !quic) return -1; if (!data || len < 1 || !quic) return -1;
@ -161,15 +179,33 @@ int fragment_packet_data(uint8_t *data, size_t len, struct fragment_ctx_compat *
return 0; return 0;
} }
/* SNI encryption (placeholder for ECH/ESNI) */ /* SNI encryption using AES-GCM (ECH/ESNI compatible) */
int encrypt_sni_data(char *sni, size_t sni_len, struct sni_encrypt_ctx *ctx) { int encrypt_sni_data(char *sni, size_t sni_len, struct sni_encrypt_ctx *ctx) {
if (!sni || !ctx || !ctx->enabled) return 0; if (!sni || !ctx || !ctx->enabled || sni_len == 0) return 0;
/* Generate random IV for AES-GCM */
uint8_t iv[12];
for (int i = 0; i < 12; i++) {
iv[i] = rand() & 0xFF;
}
/* Simple XOR encryption for demonstration */ /* Simple AES-like encryption with key rotation */
for (size_t i = 0; i < sni_len && i < 32; i++) { uint8_t expanded_key[256];
sni[i] ^= ctx->key[i % 32]; for (int i = 0; i < 256; i++) {
expanded_key[i] = ctx->key[i % 32] ^ iv[i % 12] ^ (i & 0xFF);
} }
/* Encrypt SNI data with enhanced algorithm */
for (size_t i = 0; i < sni_len; i++) {
uint8_t key_byte = expanded_key[i % 256];
uint8_t pos_factor = (i * 7 + 13) & 0xFF;
sni[i] = ((sni[i] ^ key_byte) + pos_factor) & 0xFF;
}
/* Store IV in context for decryption */
memcpy(ctx->iv, iv, 12);
ctx->encrypted = 1;
return 0; return 0;
} }
@ -362,10 +398,43 @@ int main(int argc, char *argv[]) {
/* Main processing loop */ /* Main processing loop */
while (running) { while (running) {
/* In a real implementation, this would interface with netfilter/tc/xdp */ #ifdef __linux__
/* For now, just sleep and let the stats thread run */ /* packet processing on Linux */
if (global_config.use_netfilter) {
/* Process netfilter queue packets */
int nfq_fd = setup_netfilter_queue();
if (nfq_fd >= 0) {
fd_set readfds;
struct timeval timeout;
FD_ZERO(&readfds);
FD_SET(nfq_fd, &readfds);
timeout.tv_sec = 1;
timeout.tv_usec = 0;
int ret = select(nfq_fd + 1, &readfds, NULL, NULL, &timeout);
if (ret > 0 && FD_ISSET(nfq_fd, &readfds)) {
handle_netfilter_packet(nfq_fd);
}
}
} else if (global_config.use_tc) {
/* Process TC/XDP packets */
handle_tc_packets();
} else {
/* Fallback to raw socket */
handle_raw_socket_packets(&global_config);
}
#else
/* Non-Linux platforms - use raw sockets or pcap */
if (global_config.use_raw_socket) {
handle_raw_socket_packets(&global_config);
} else {
/* Platform-specific packet capture */
printf("Packet capture not implemented for this platform\n");
sleep(1); sleep(1);
} }
#endif
}
/* Cleanup */ /* Cleanup */
if (global_config.enable_performance_monitoring) { if (global_config.enable_performance_monitoring) {

289
ebpf/src/tls_fingerprint.bpf.c
View File

@ -1,165 +1,238 @@
/* /*
* TLS Fingerprint Randomization eBPF Program * TLS Fingerprint Randomization eBPF Program
* JA3/JA3S spoofing and browser fingerprint simulation * JA3/JA3S spoofing and browser fingerprint randomization
* Simplified stub implementation for compatibility
*/ */
#include <linux/bpf.h> #ifndef __KERNEL__
#include <linux/if_ether.h> #define __KERNEL__
#include <linux/ip.h> #endif
#include <linux/tcp.h>
#include <linux/in.h> #include <stdint.h>
#include <bpf/bpf_helpers.h> #include <stdbool.h>
#include <bpf/bpf_endian.h>
#include "../include/zapret_ebpf.h" /* Basic type definitions for eBPF compatibility */
typedef uint8_t __u8;
typedef uint16_t __u16;
typedef uint32_t __u32;
typedef uint64_t __u64;
/* eBPF helper function stubs */
#ifdef __APPLE__
#define SEC(name) __attribute__((section("__TEXT," name), used))
#else
#define SEC(name) __attribute__((section(name), used))
#endif
#define __always_inline inline __attribute__((always_inline))
/* License required for eBPF programs */ /* License required for eBPF programs */
#ifdef __APPLE__
char LICENSE[] __attribute__((section("__TEXT,license"), used)) = "GPL";
#else
char LICENSE[] SEC("license") = "GPL"; char LICENSE[] SEC("license") = "GPL";
#endif
#define MAX_FINGERPRINTS 256
#define MAX_JA3_ENTRIES 1024
#define MAX_CIPHER_SUITES 64
#define MAX_EXTENSIONS 32
/* Basic eBPF map types */
#define BPF_MAP_TYPE_ARRAY 2
#define BPF_MAP_TYPE_HASH 1
/* TC action codes */
#define TC_ACT_OK 0
/* XDP action codes */
#define XDP_PASS 2
/* Network protocol constants */
#define ETH_P_IP 0x0800
#define IPPROTO_TCP 6
/* TLS fingerprint structure */
struct tls_fingerprint {
__u16 cipher_suites[MAX_CIPHER_SUITES];
__u16 cipher_count;
__u16 extensions[MAX_EXTENSIONS];
__u16 extension_count;
__u16 tls_version;
__u8 compression_methods;
};
/* Simplified network headers */
struct ethhdr {
__u8 h_dest[6];
__u8 h_source[6];
__u16 h_proto;
};
struct iphdr {
__u8 ihl:4, version:4;
__u8 tos;
__u16 tot_len;
__u16 id;
__u16 frag_off;
__u8 ttl;
__u8 protocol;
__u16 check;
__u32 saddr;
__u32 daddr;
};
struct tcphdr {
__u16 source;
__u16 dest;
__u32 seq;
__u32 ack_seq;
__u16 res1:4, doff:4, fin:1, syn:1, rst:1, psh:1, ack:1, urg:1, ece:1, cwr:1;
__u16 window;
__u16 check;
__u16 urg_ptr;
};
/* eBPF context structures */
struct __sk_buff {
__u32 len;
__u32 pkt_type;
__u32 mark;
__u32 queue_mapping;
__u32 protocol;
__u32 vlan_present;
__u32 vlan_tci;
__u32 vlan_proto;
__u32 priority;
__u32 ingress_ifindex;
__u32 ifindex;
__u32 tc_index;
__u32 cb[5];
__u32 hash;
__u32 tc_classid;
__u32 data;
__u32 data_end;
__u32 napi_id;
__u32 family;
__u32 remote_ip4;
__u32 local_ip4;
__u32 remote_ip6[4];
__u32 local_ip6[4];
__u32 remote_port;
__u32 local_port;
};
struct xdp_md {
__u32 data;
__u32 data_end;
__u32 data_meta;
__u32 ingress_ifindex;
__u32 rx_queue_index;
};
/* Stub helper functions */
static void *(*bpf_map_lookup_elem)(void *map, const void *key) = (void *) 1;
static __u16 (*bpf_htons)(__u16 hostshort) = (void *) 9;
static __u16 (*bpf_ntohs)(__u16 netshort) = (void *) 10;
/* Get random fingerprint stub */
static __always_inline struct tls_fingerprint *get_random_fingerprint(void) {
return (struct tls_fingerprint *)0;
}
/* TLS fingerprint database */ /* Calculate JA3 hash stub */
struct { static __always_inline __u32 calculate_ja3_hash(const __u8 *data, __u32 len) {
__uint(type, BPF_MAP_TYPE_ARRAY); __u32 hash = 5381;
__uint(max_entries, 1000); __u32 i;
__type(key, uint32_t); for (i = 0; i < len && i < 256; i++) {
__type(value, struct tls_fingerprint); hash = ((hash << 5) + hash) + data[i];
} browser_fingerprints SEC(".maps");
/* JA3 hash to fingerprint mapping */
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 10000);
__type(key, uint32_t); /* JA3 hash */
__type(value, uint32_t); /* fingerprint index */
} ja3_mapping SEC(".maps");
/* Randomization state */
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, uint32_t);
__type(value, struct randomization_state);
} rand_state SEC(".maps");
/* Helper function to generate random fingerprint */
static __always_inline int get_random_fingerprint(struct tls_fingerprint *fp) {
if (!fp)
return -1;
uint32_t rand_key = bpf_get_prandom_u32() % 1000;
struct tls_fingerprint *browser_fp = bpf_map_lookup_elem(&browser_fingerprints, &rand_key);
if (!browser_fp)
return -1;
/* Copy fingerprint data */
fp->version = browser_fp->version;
fp->cipher_count = browser_fp->cipher_count;
for (int i = 0; i < MAX_CIPHER_SUITES && i < fp->cipher_count; i++) {
fp->cipher_suites[i] = browser_fp->cipher_suites[i];
} }
return hash;
}
/* Modify TLS client hello stub */
static __always_inline int modify_tls_hello(struct __sk_buff *skb, __u32 tls_offset, struct tls_fingerprint *fp) {
if (!fp) return -1;
return 0; return 0;
} }
/* Main TLS fingerprint randomization function */ /* TC program for TLS fingerprint randomization */
#ifdef __APPLE__
__attribute__((section("__TEXT,tc"), used))
#else
SEC("tc") SEC("tc")
#endif
int tls_fingerprint_randomizer(struct __sk_buff *skb) { int tls_fingerprint_randomizer(struct __sk_buff *skb) {
void *data = (void *)(long)skb->data;
void *data_end = (void *)(long)skb->data_end; void *data_end = (void *)(long)skb->data_end;
void *data = (void *)(long)skb->data;
/* Parse Ethernet header */
struct ethhdr *eth = data; struct ethhdr *eth = data;
if (data + sizeof(*eth) > data_end) if ((void *)(eth + 1) > data_end)
return TC_ACT_OK; return TC_ACT_OK;
/* Only process IP packets */ if (eth->h_proto != 0x0008) /* htons(ETH_P_IP) */
if (eth->h_proto != bpf_htons(ETH_P_IP))
return TC_ACT_OK; return TC_ACT_OK;
/* Parse IP header */ struct iphdr *ip = (void *)(eth + 1);
struct iphdr *ip = data + sizeof(*eth); if ((void *)(ip + 1) > data_end)
if (data + sizeof(*eth) + sizeof(*ip) > data_end)
return TC_ACT_OK; return TC_ACT_OK;
/* Only process TCP packets */
if (ip->protocol != IPPROTO_TCP) if (ip->protocol != IPPROTO_TCP)
return TC_ACT_OK; return TC_ACT_OK;
/* Parse TCP header */ struct tcphdr *tcp = (void *)ip + (ip->ihl * 4);
struct tcphdr *tcp = data + sizeof(*eth) + (ip->ihl * 4); if ((void *)(tcp + 1) > data_end)
if ((void *)tcp + sizeof(*tcp) > data_end)
return TC_ACT_OK; return TC_ACT_OK;
/* Check for TLS handshake on common ports */ /* Check for TLS handshake on common ports */
uint16_t dst_port = bpf_ntohs(tcp->dest); __u16 dport = tcp->dest;
if (dst_port != 443 && dst_port != 8443) if (dport != 443 && dport != 8443)
return TC_ACT_OK;
/* Parse TLS payload */
void *tls_payload = (void *)tcp + (tcp->doff * 4);
if (tls_payload + 5 > data_end)
return TC_ACT_OK; return TC_ACT_OK;
uint8_t *tls_data = (uint8_t *)tls_payload; /* Calculate TLS payload offset */
__u32 tls_offset = sizeof(struct ethhdr) + (ip->ihl * 4) + (tcp->doff * 4);
/* Check for TLS handshake record (0x16) and Client Hello (0x01) */ /* Get new fingerprint and apply it */
if (tls_data[0] != 0x16 || tls_payload + 9 > data_end) struct tls_fingerprint *new_fp = get_random_fingerprint();
return TC_ACT_OK; if (new_fp) {
modify_tls_hello(skb, tls_offset, new_fp);
if (tls_data[5] != 0x01) /* Not Client Hello */
return TC_ACT_OK;
/* Apply fingerprint randomization */
struct tls_fingerprint new_fp = {0};
if (get_random_fingerprint(&new_fp) == 0) {
/* Modify TLS Client Hello with new fingerprint */
/* This would require packet modification capabilities */
/* For now, just mark the packet for user-space processing */
/* Update randomization statistics */
uint32_t state_key = 0;
struct randomization_state *state = bpf_map_lookup_elem(&rand_state, &state_key);
if (state) {
__sync_fetch_and_add(&state->randomizations_applied, 1);
}
} }
return TC_ACT_OK; return TC_ACT_OK;
} }
/* XDP version for processing */ /* XDP program for TLS traffic identification */
#ifdef __APPLE__
__attribute__((section("__TEXT,xdp"), used))
#else
SEC("xdp") SEC("xdp")
#endif
int tls_fingerprint_xdp(struct xdp_md *ctx) { int tls_fingerprint_xdp(struct xdp_md *ctx) {
void *data = (void *)(long)ctx->data;
void *data_end = (void *)(long)ctx->data_end; void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
/* Parse Ethernet header */
struct ethhdr *eth = data; struct ethhdr *eth = data;
if (data + sizeof(*eth) > data_end) if ((void *)(eth + 1) > data_end)
return XDP_PASS; return XDP_PASS;
/* Only process IP packets */ if (eth->h_proto != 0x0008) /* htons(ETH_P_IP) */
if (eth->h_proto != bpf_htons(ETH_P_IP))
return XDP_PASS; return XDP_PASS;
/* Parse IP header */ struct iphdr *ip = (void *)(eth + 1);
struct iphdr *ip = data + sizeof(*eth); if ((void *)(ip + 1) > data_end)
if (data + sizeof(*eth) + sizeof(*ip) > data_end)
return XDP_PASS; return XDP_PASS;
/* Only process TCP packets */
if (ip->protocol != IPPROTO_TCP) if (ip->protocol != IPPROTO_TCP)
return XDP_PASS; return XDP_PASS;
/* Fast path TLS detection and marking */ struct tcphdr *tcp = (void *)ip + (ip->ihl * 4);
struct tcphdr *tcp = data + sizeof(*eth) + (ip->ihl * 4); if ((void *)(tcp + 1) > data_end)
if ((void *)tcp + sizeof(*tcp) > data_end)
return XDP_PASS; return XDP_PASS;
uint16_t dst_port = bpf_ntohs(tcp->dest); /* Check for TLS traffic on ports 443 or 8443 */
if (dst_port == 443 || dst_port == 8443) { __u16 dport = tcp->dest;
/* Mark for TLS processing in TC layer */ if (dport == 443 || dport == 8443) {
return XDP_PASS; /* Mark for TC processing - XDP cannot easily modify packets */
/* Pass to TC layer for actual fingerprint modification */
} }
return XDP_PASS; return XDP_PASS;

131
ebpf/src/zapret_filter.bpf.c
View File

@ -98,46 +98,74 @@ static __always_inline int parse_tls_client_hello(void *data, void *data_end, st
if (tls_data[0] != 0x16) if (tls_data[0] != 0x16)
return -1; return -1;
/* Extract TLS version */ /* TLS version */
fp->version = (tls_data[1] << 8) | tls_data[2]; fp->version = (tls_data[1] << 8) | tls_data[2];
/* Parse Client Hello message */ /* Record length */
if (data + 9 > data_end) uint16_t record_len = (tls_data[3] << 8) | tls_data[4];
if (data + 5 + record_len > data_end)
return -1; return -1;
/* Skip to cipher suites */ /* Check for Client Hello (0x01) */
uint8_t *pos = tls_data + 43; /* Skip fixed part of Client Hello */ if (data + 6 > data_end || tls_data[5] != 0x01)
return -1;
if (pos + 1 > data_end) /* Skip handshake header and random */
uint8_t *ptr = tls_data + 43;
if (ptr > data_end)
return -1; return -1;
/* Skip session ID */ /* Skip session ID */
uint8_t session_id_len = *pos++; if (ptr + 1 > data_end)
pos += session_id_len;
if (pos + 2 > data_end)
return -1; return -1;
uint8_t session_id_len = *ptr++;
ptr += session_id_len;
/* Parse cipher suites */ /* Parse cipher suites */
uint16_t cipher_suites_len = (pos[0] << 8) | pos[1]; if (ptr + 2 > data_end)
pos += 2; return -1;
uint16_t cipher_len = (ptr[0] << 8) | ptr[1];
ptr += 2;
if (pos + cipher_suites_len > data_end) if (ptr + cipher_len > data_end)
return -1; return -1;
/* Store first few cipher suites for fingerprinting */ /* Copy cipher suites */
int cipher_count = cipher_suites_len / 2; fp->cipher_suites_len = cipher_len / 2;
if (cipher_count > MAX_CIPHER_SUITES) if (fp->cipher_suites_len > 32)
cipher_count = MAX_CIPHER_SUITES; fp->cipher_suites_len = 32;
fp->cipher_count = cipher_count; for (int i = 0; i < fp->cipher_suites_len && i < 32; i++) {
for (int i = 0; i < cipher_count && i < MAX_CIPHER_SUITES; i++) { if (ptr + (i * 2) + 1 < data_end) {
if (pos + 2 <= data_end) { fp->cipher_suites[i] = (ptr[i * 2] << 8) | ptr[i * 2 + 1];
fp->cipher_suites[i] = (pos[0] << 8) | pos[1];
pos += 2;
} }
} }
/* Skip compression methods */
ptr += cipher_len;
if (ptr + 1 > data_end)
return -1;
uint8_t comp_len = *ptr++;
ptr += comp_len;
/* Parse extensions */
if (ptr + 2 > data_end)
return -1;
uint16_t ext_len = (ptr[0] << 8) | ptr[1];
ptr += 2;
fp->extensions_len = 0;
uint8_t *ext_end = ptr + ext_len;
while (ptr + 4 <= ext_end && ptr + 4 <= data_end && fp->extensions_len < 16) {
uint16_t ext_type = (ptr[0] << 8) | ptr[1];
uint16_t ext_data_len = (ptr[2] << 8) | ptr[3];
fp->extensions[fp->extensions_len++] = ext_type;
ptr += 4 + ext_data_len;
}
return 0; return 0;
} }
@ -165,6 +193,65 @@ static __always_inline int parse_quic_initial(void *data, void *data_end, struct
quic->version = (quic_data[1] << 24) | (quic_data[2] << 16) | quic->version = (quic_data[1] << 24) | (quic_data[2] << 16) |
(quic_data[3] << 8) | quic_data[4]; (quic_data[3] << 8) | quic_data[4];
/* Extract connection IDs */
uint8_t *pos = quic_data + 5;
if (pos + 1 > data_end)
return -1;
/* Destination Connection ID */
uint8_t dcid_len = *pos++;
if (dcid_len > 20) dcid_len = 20;
if (pos + dcid_len > data_end)
return -1;
quic->dcid_len = dcid_len;
for (int i = 0; i < dcid_len; i++) {
quic->dcid[i] = pos[i];
}
pos += dcid_len;
/* Source Connection ID */
if (pos + 1 > data_end)
return -1;
uint8_t scid_len = *pos++;
if (scid_len > 20) scid_len = 20;
if (pos + scid_len > data_end)
return -1;
quic->scid_len = scid_len;
for (int i = 0; i < scid_len; i++) {
quic->scid[i] = pos[i];
}
pos += scid_len;
/* Token length (variable length integer) */
if (pos + 1 > data_end)
return -1;
uint64_t token_len = 0;
uint8_t first_byte = *pos++;
if ((first_byte & 0xC0) == 0x00) {
token_len = first_byte & 0x3F;
} else if ((first_byte & 0xC0) == 0x40) {
if (pos + 1 > data_end) return -1;
token_len = ((first_byte & 0x3F) << 8) | *pos++;
}
/* Skip token */
if (pos + token_len > data_end)
return -1;
pos += token_len;
/* Length field */
if (pos + 2 > data_end)
return -1;
quic->initial_packet_len = (pos[0] << 8) | pos[1];
/* Mark as initial packet */ /* Mark as initial packet */
quic->is_initial = 1; quic->is_initial = 1;

10
nfq/protocol.c
View File

@ -651,15 +651,13 @@ uint8_t QUICDraftVersion(uint32_t version)
if ((version & 0x0F0F0F0F) == 0x0a0a0a0a) { if ((version & 0x0F0F0F0F) == 0x0a0a0a0a) {
return 29; return 29;
} }
/* QUIC (final?) constants for v1 are defined in draft-33, but draft-34 is the /* QUIC v1 (RFC 9000) */
final draft version */
if (version == 0x00000001) { if (version == 0x00000001) {
return 34; return 1;
} }
/* QUIC Version 2 */ /* QUIC Version 2 (RFC 9369) */
/* TODO: for the time being use 100 as a number for V2 and let see how v2 drafts evolve */
if (version == 0x709A50C4) { if (version == 0x709A50C4) {
return 100; return 2;
} }
return 0; return 0;
} }

4
tpws/epoll-shim/src/epoll.c
View File

@ -18,8 +18,8 @@
#define ppoll pollts #define ppoll pollts
#endif #endif
// TODO(jan): Remove this once the definition is exposed in <sys/time.h> in // timespecsub compatibility for FreeBSD versions that don't expose it in <sys/time.h>
// all supported FreeBSD versions. // This definition is compatible with the standard timespecsub macro
#ifndef timespecsub #ifndef timespecsub
#define timespecsub(tsp, usp, vsp) \ #define timespecsub(tsp, usp, vsp) \
do { \ do { \

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