Mirrors/hexchat
1
0
Fork 0
mirror of https://github.com/hexchat/hexchat.git synced 2024-11-08 20:22:30 +01:00
Code Issues Packages Projects Releases Wiki Activity

Fixed proxy user/password buffer overflow

Browse Source 
By using a dedicated buffer for sending the username and password for the SOCKS5 proxy, there will be no overflow when copying them to the buffer.
And therefore, RFC 1929 is fully supported.
This commit is contained in:
DjLegolas 2020-04-11 13:01:35 +03:00 committed by Patrick
parent 37192a9136
commit 7b950eb021
1 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
src/common/server.c
View File

@ -1116,6 +1116,7 @@ traverse_socks5 (int print_fd, int sok, char *serverAddr, int port)
if (auth)
{
int len_u=0, len_p=0;
unsigned char *u_p_buf;
/* authentication sub-negotiation (RFC1929) */
if (buf[1] != 2) /* UPA not supported by server */
@ -1124,18 +1125,22 @@ traverse_socks5 (int print_fd, int sok, char *serverAddr, int port)
return 1;
}
memset (buf, 0, sizeof(buf));
/* form the UPA request */
len_u = strlen (prefs.hex_net_proxy_user);
len_p = strlen (prefs.hex_net_proxy_pass);
buf[0] = 1;
buf[1] = len_u;
memcpy (buf + 2, prefs.hex_net_proxy_user, len_u);
buf[2 + len_u] = len_p;
memcpy (buf + 3 + len_u, prefs.hex_net_proxy_pass, len_p);
send (sok, buf, 3 + len_u + len_p, 0);
packetlen = 2 + len_u + 1 + len_p;
u_p_buf = g_malloc0 (packetlen);
u_p_buf[0] = 1;
u_p_buf[1] = len_u;
memcpy (u_p_buf + 2, prefs.hex_net_proxy_user, len_u);
u_p_buf[2 + len_u] = len_p;
memcpy (u_p_buf + 3 + len_u, prefs.hex_net_proxy_pass, len_p);
send (sok, u_p_buf, packetlen, 0);
g_free(u_p_buf);
if ( recv (sok, buf, 2, 0) != 2 )
goto read_error;
if ( buf[1] != 0 )