diff options
Diffstat (limited to '')
| -rw-r--r-- | socks.c | 138 |
1 files changed, 128 insertions, 10 deletions
@@ -23,10 +23,11 @@ */ /* - * 2004-01-30: Added Socks5 proxy support + * 2004-01-30: Added Socks5 proxy support, see RFC 1928 * (Christof Meerwald, http://cmeerw.org) * - * see RFC 1928, only supports "no authentication" + * 2010-10-10: Added Socks5 plain text authentication support (RFC 1929) + * (Pierre Bourdon <delroth@gmail.com>) */ #include "syshead.h" @@ -38,10 +39,12 @@ #include "win32.h" #include "socket.h" #include "fdmisc.h" +#include "misc.h" #include "proxy.h" #include "memdbg.h" +#define UP_TYPE_SOCKS "SOCKS Proxy" void socks_adjust_frame_parameters (struct frame *frame, int proto) @@ -53,6 +56,7 @@ socks_adjust_frame_parameters (struct frame *frame, int proto) struct socks_proxy_info * socks_proxy_new (const char *server, int port, + const char *authfile, bool retry, struct auto_proxy_info *auto_proxy_info) { @@ -77,6 +81,12 @@ socks_proxy_new (const char *server, strncpynt (p->server, server, sizeof (p->server)); p->port = port; + + if (authfile) + strncpynt (p->authfile, authfile, sizeof (p->authfile)); + else + p->authfile[0] = 0; + p->retry = retry; p->defined = true; @@ -90,15 +100,99 @@ socks_proxy_close (struct socks_proxy_info *sp) } static bool -socks_handshake (socket_descriptor_t sd, volatile int *signal_received) +socks_username_password_auth (struct socks_proxy_info *p, + socket_descriptor_t sd, + volatile int *signal_received) +{ + char to_send[516]; + char buf[2]; + int len = 0; + const int timeout_sec = 5; + struct user_pass creds; + ssize_t size; + + creds.defined = 0; + + get_user_pass (&creds, p->authfile, UP_TYPE_SOCKS, GET_USER_PASS_MANAGEMENT); + snprintf (to_send, sizeof (to_send), "\x01%c%s%c%s", strlen(creds.username), + creds.username, strlen(creds.password), creds.password); + size = send (sd, to_send, strlen(to_send), MSG_NOSIGNAL); + + if (size != strlen (to_send)) + { + msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port write failed on send()"); + return false; + } + + while (len < 2) + { + int status; + ssize_t size; + fd_set reads; + struct timeval tv; + char c; + + FD_ZERO (&reads); + FD_SET (sd, &reads); + tv.tv_sec = timeout_sec; + tv.tv_usec = 0; + + status = select (sd + 1, &reads, NULL, NULL, &tv); + + get_signal (signal_received); + if (*signal_received) + return false; + + /* timeout? */ + if (status == 0) + { + msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read timeout expired"); + return false; + } + + /* error */ + if (status < 0) + { + msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read failed on select()"); + return false; + } + + /* read single char */ + size = recv(sd, &c, 1, MSG_NOSIGNAL); + + /* error? */ + if (size != 1) + { + msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_username_password_auth: TCP port read failed on recv()"); + return false; + } + + /* store char in buffer */ + buf[len++] = c; + } + + /* VER = 5, SUCCESS = 0 --> auth success */ + if (buf[0] != 5 && buf[1] != 0) + { + msg (D_LINK_ERRORS, "socks_username_password_auth: server refused the authentication"); + return false; + } + + return true; +} + +static bool +socks_handshake (struct socks_proxy_info *p, + socket_descriptor_t sd, + volatile int *signal_received) { char buf[2]; int len = 0; const int timeout_sec = 5; - /* VER = 5, NMETHODS = 1, METHODS = [0] */ - const ssize_t size = send (sd, "\x05\x01\x00", 3, MSG_NOSIGNAL); - if (size != 3) + /* 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) { msg (D_LINK_ERRORS | M_ERRNO_SOCK, "socks_handshake: TCP port write failed on send()"); return false; @@ -151,13 +245,37 @@ socks_handshake (socket_descriptor_t sd, volatile int *signal_received) buf[len++] = c; } - /* VER == 5 && METHOD == 0 */ - if (buf[0] != '\x05' || buf[1] != '\x00') + /* VER == 5 */ + if (buf[0] != '\x05') { msg (D_LINK_ERRORS, "socks_handshake: Socks proxy returned bad status"); return false; } + /* select the appropriate authentication method */ + switch (buf[1]) + { + case 0: /* no authentication */ + break; + + case 2: /* login/password */ + if (!p->authfile[0]) + { + msg(D_LINK_ERRORS, "socks_handshake: server asked for username/login auth but we were " + "not provided any credentials"); + return false; + } + + if (!socks_username_password_auth(p, sd, signal_received)) + return false; + + break; + + default: /* unknown auth method */ + msg(D_LINK_ERRORS, "socks_handshake: unknown SOCKS auth method"); + return false; + } + return true; } @@ -281,7 +399,7 @@ establish_socks_proxy_passthru (struct socks_proxy_info *p, char buf[128]; size_t len; - if (!socks_handshake (sd, signal_received)) + if (!socks_handshake (p, sd, signal_received)) goto error; /* format Socks CONNECT message */ @@ -328,7 +446,7 @@ establish_socks_proxy_udpassoc (struct socks_proxy_info *p, struct openvpn_sockaddr *relay_addr, volatile int *signal_received) { - if (!socks_handshake (ctrl_sd, signal_received)) + if (!socks_handshake (p, ctrl_sd, signal_received)) goto error; { |