forked from oscam-emu/OSEmu
/
OSEmu.c
executable file
·200 lines (174 loc) · 5.23 KB
/
OSEmu.c
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#include "globals.h"
#include "helpfunctions.h"
#define MD5_DIGEST_LENGTH 16
static const unsigned char cl_user[64];
static const unsigned char cl_passwd[64];
static struct aes_keys cl_aes_keys;
static const uchar cl_ucrc[4];
static int cl_sockfd;
static struct sockaddr_in cl_socket;
#define REQ_SIZE 584 // 512 + 20 + 0x34
static int32_t camd35_send(uchar *buf, int32_t buflen)
{
int32_t l;
unsigned char rbuf[REQ_SIZE+15+4], *sbuf = rbuf + 4;
//Fix ECM len > 255
if (buflen <= 0)
buflen = ((buf[0] == 0)? (((buf[21]&0x0f)<< 8) | buf[22])+3 : buf[1]);
l = 20 + (((buf[0] == 3) || (buf[0] == 4)) ? 0x34 : 0) + buflen;
memcpy(rbuf, cl_ucrc, 4);
memcpy(sbuf, buf, l);
memset(sbuf + l, 0xff, 15); // set unused space to 0xff for newer camd3's
i2b_buf(4, crc32(0L, sbuf+20, buflen), sbuf + 4);
l = boundary(4, l);
cs_log_debug("send %d bytes to client", l);
aes_encrypt_idx(&cl_aes_keys, sbuf, l);
int32_t status;
socklen_t len = sizeof(cl_socket);
status = sendto(cl_sockfd, rbuf, l+4, 0, (struct sockaddr *)&cl_socket, len);
return status;
}
static int32_t camd35_auth_client(uchar *ucrc)
{
int32_t rc=1;
uint32_t crc;
unsigned char md5tmp[MD5_DIGEST_LENGTH];
crc=(((ucrc[0]<<24) | (ucrc[1]<<16) | (ucrc[2]<<8) | ucrc[3]) & 0xffffffffL);
if (crc==crc32(0L, MD5(cl_user, strlen(cl_user), md5tmp), MD5_DIGEST_LENGTH)){
memcpy(&cl_ucrc, ucrc, 4);
return 0;
}
return(1);
}
static int32_t camd35_recv(uchar *buf, int32_t rs)
{
int32_t rc = 0, s, n=0, buflen=0, len=0;
for (s=0; !rc; s++) {
switch(s) {
case 0:
if (rs < 36) {
rc = -1;
goto out;
}
break;
case 1:
switch (camd35_auth_client(buf)) {
case 0: break; // ok
case 1: rc=-2; break; // unknown user
}
memmove(buf, buf+4, rs-=4);
break;
case 2:
aes_decrypt(&cl_aes_keys, buf, rs);
if (rs!=boundary(4, rs))
cs_log_debug("WARNING: packet size has wrong decryption boundary");
n=(buf[0]==3) ? 0x34 : 0;
//Fix for ECM request size > 255 (use ecm length field)
if(buf[0]==0)
buflen = (((buf[21]&0x0f)<< 8) | buf[22])+3;
else
buflen = buf[1];
n = boundary(4, n+20+buflen);
cs_log_debug("received %d bytes from client", rs);
if (n<rs)
cs_log_debug("ignoring %d bytes of garbage", rs-n);
else
if (n>rs) rc=-3;
break;
case 3:
if (crc32(0L, buf+20, buflen)!=b2i(4, buf+4)) rc=-4;
if (!rc) rc=n;
break;
}
}
out:
switch(rc) {
case -2: cs_log("unknown user"); break;
case -3: cs_log("incomplete request!"); break;
case -4: cs_log("checksum error (wrong password?)"); break;
}
return(rc);
}
static void camd35_process_ecm(uchar *buf, int buflen){
ECM_REQUEST er;
if (!buf || buflen < 23)
return;
uint16_t ecmlen = (((buf[21] & 0x0f)<< 8) | buf[22])+3;
if (ecmlen + 20 > buflen)
return;
er.ecmlen = ecmlen;
er.srvid = b2i(2, buf+ 8);
er.caid = b2i(2, buf+10);
er.prid = b2i(4, buf+12);
memcpy(er.ecm, buf + 20, er.ecmlen);
// ========================================================================
// HANDLE ECM HERE! Following 5 lines are just here for testing!
// ========================================================================
cs_log("SRVID: %04X", er.srvid);
cs_log("CAID: %04X", er.caid);
cs_log("PRID: %04X", er.prid);
er.rc = E_FOUND;
memset(&er.cw, 0x02, sizeof(er.cw));
if (er.rc == E_NOTFOUND){
buf[0] = 0x08;
buf[1] = 2;
memset(buf + 20, 0, buf[1]);
buf[22] = er.rc; //put rc in byte 22 - hopefully don't break legacy camd3
} else {
if (buf[0]==3)
memmove(buf + 20 + 16, buf + 20 + buf[1], 0x34);
buf[0]++;
buf[1] = 16;
memcpy(buf+20, er.cw, buf[1]);
}
camd35_send(buf, 0);
}
int main(int argc, char**argv)
{
int n, opt, port = 0, accountok = 0;
struct sockaddr_in servaddr;
socklen_t len;
char mbuf[1000];
unsigned char md5tmp[MD5_DIGEST_LENGTH];
while ((opt = getopt(argc, argv, "a:p:")) != -1) {
switch (opt) {
case 'a': {
char *ptr = strtok(optarg, ":");
cs_strncpy((char *)&cl_user, ptr, sizeof(cl_user));
ptr = strtok(NULL, ":");
if(ptr) {
cs_strncpy((char *)&cl_passwd, ptr, sizeof(cl_passwd));
accountok = 1;
}
break;
}
case 'p':
port = atoi(optarg);
break;
default:
fprintf(stderr, "Usage: %s -a <user>:<password> -p <port>\n", argv[0]);
exit(0);
}
}
if(port == 0 || accountok == 0){
fprintf(stderr, "Usage: %s -a <user>:<password> -p <port>\n", argv[0]);
exit(0);
}
cl_sockfd = socket(AF_INET,SOCK_DGRAM,0);
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(port);
bind(cl_sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr));
aes_set_key(&cl_aes_keys, (char *) MD5(cl_passwd, strlen((char *)cl_passwd), md5tmp));
for (;;){
len = sizeof(cl_socket);
n = recvfrom(cl_sockfd,mbuf,sizeof(mbuf),0,(struct sockaddr *)&cl_socket,&len);
camd35_recv(mbuf, n);
if(mbuf[0] == 0 || mbuf[0] == 3) {
camd35_process_ecm(mbuf, n);
} else {
cs_log("unknown/not implemented camd35 command! (%d) n=%d", mbuf[0], n);
}
}
}