diff options
Diffstat (limited to 'src/openvpn/socks.c')
| -rw-r--r-- | src/openvpn/socks.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/openvpn/socks.c b/src/openvpn/socks.c index 235982e..2f051ec 100644 --- a/src/openvpn/socks.c +++ b/src/openvpn/socks.c @@ -189,10 +189,15 @@ socks_handshake (struct socks_proxy_info *p, char buf[2]; int len = 0; const int timeout_sec = 5; + ssize_t size; + + /* VER = 5, NMETHODS = 1, METHODS = [0 (no auth)] */ + char method_sel[3] = { 0x05, 0x01, 0x00 }; + if (p->authfile[0]) + method_sel[2] = 0x02; /* METHODS = [2 (plain login)] */ - /* VER = 5, NMETHODS = 2, METHODS = [0 (no auth), 2 (plain login)] */ - const ssize_t size = send (sd, "\x05\x02\x00\x02", 4, MSG_NOSIGNAL); - if (size != 4) + size = send (sd, method_sel, sizeof (method_sel), MSG_NOSIGNAL); + if (size != sizeof (method_sel)) { msg (D_LINK_ERRORS | M_ERRNO, "socks_handshake: TCP port write failed on send()"); return false; @@ -252,6 +257,13 @@ socks_handshake (struct socks_proxy_info *p, return false; } + /* validate that the auth method returned is the one sent */ + if (buf[1] != method_sel[2]) + { + msg (D_LINK_ERRORS, "socks_handshake: Socks proxy returned unexpected auth"); + return false; + } + /* select the appropriate authentication method */ switch (buf[1]) { |