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fix potential buffer overflow (exists in vanilla 3.1 as well)

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This commit is contained in:
rofl0r 2011-11-07 17:07:00 +01:00
parent 16fa60a705
commit 0845d1c044
1 changed files with 17 additions and 10 deletions
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27
src/core.c
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@ -269,6 +269,11 @@ static int tunnel_to(int sock, ip_type ip, unsigned short port, proxy_type pt,ch
size_t ulen = strlen(user);
size_t passlen = strlen(pass);
if(ulen > 0xFF || passlen > 0xFF || dns_len > 0xFF) {
proxychains_write_log(LOG_PREFIX "error: maximum size of 255 for user/pass or domain name!\n");
goto err;
}
int len;
unsigned char buff[BUFF_SIZE];
//memset (buff, 0, sizeof(buff));
@ -276,27 +281,29 @@ static int tunnel_to(int sock, ip_type ip, unsigned short port, proxy_type pt,ch
switch(pt) {
case HTTP_TYPE: {
if(!dns_len)
snprintf((char*)buff, sizeof(buff), "CONNECT %s:%d HTTP/1.0\r\n",
inet_ntoa( * (struct in_addr *) &ip.as_int), ntohs(port));
else
snprintf((char*)buff, sizeof(buff), "CONNECT %s:%d HTTP/1.0\r\n", dns_name, ntohs(port));
dns_name = inet_ntoa( * (struct in_addr *) &ip.as_int);
snprintf((char*)buff, sizeof(buff), "CONNECT %s:%d HTTP/1.0\r\n", dns_name, ntohs(port));
if (user[0])
{
char src[256];
char dst[512];
#define HTTP_AUTH_MAX ((0xFF * 2) + 1 + 1)
// 2 * 0xff: username and pass, plus 1 for ':' and 1 for zero terminator.
char src[HTTP_AUTH_MAX];
char dst[(4 * HTTP_AUTH_MAX)];
memcpy(src, user, ulen);
memcpy(src + ulen, ":", 1);
memcpy(src + ulen + 1, pass, passlen);
src[ulen + 1 + passlen] = 0;
encode_base_64(src,dst,512);
encode_base_64(src, dst, sizeof(dst));
strcat((char*)buff,"Proxy-Authorization: Basic ");
strcat((char*)buff,dst);
strcat((char*)buff,"\r\n\r\n");
strcat((char*)buff, dst);
strcat((char*)buff, "\r\n\r\n");
}
else
strcat((char*)buff,"\r\n");
strcat((char*)buff, "\r\n");
len = strlen((char*)buff);