diff options
Diffstat (limited to 'lib/request.c')
| -rw-r--r-- | lib/request.c | 177 |
1 files changed, 172 insertions, 5 deletions
diff --git a/lib/request.c b/lib/request.c index f0b15e0..85278f3 100644 --- a/lib/request.c +++ b/lib/request.c @@ -39,12 +39,179 @@ _timer_cb(evutil_socket_t fd, short what, void *arg) } #endif +static void +_rs_req_connected(void *user_data) +{ + struct rs_request *request = (struct rs_request *)user_data; +} + +static void +_rs_req_disconnected(void *user_data) +{ + struct rs_request *request = (struct rs_request *)user_data; +} + +static void +_rs_req_packet_received(const struct rs_packet *pkt, void *user_data) +{ + struct rs_request *request = (struct rs_request *)user_data; + int err; + VALUE_PAIR *vp; + + assert (request); + assert (request->conn); + assert (request->req); + + err = rad_verify(pkt->rpkt, request->req->rpkt, + pkt->conn->active_peer->secret); + if (err) + return; + + for (vp = pkt->rpkt->vps; vp != NULL; vp = vp->next) + { + if (VENDOR(vp->attribute) != VENDORPEC_MS) + continue; + + switch (vp->attribute & 0xffff) + { + case PW_MS_MPPE_SEND_KEY: + case PW_MS_MPPE_RECV_KEY: + err = _rs_decrypt_mppe (request, vp); + if (err) + return; + break; + default: + break; + } + } + + request->verified = 1; +} + +static void +_rs_req_packet_sent(void *user_data) +{ + struct rs_request *request = (struct rs_request *)user_data; +} + int -rs_req_send(struct rs_request *request, struct rs_packet *req, - struct rs_packet **resp) +rs_request_send(struct rs_request *request, struct rs_packet *req, + struct rs_packet **resp) { - /* install our own callback, backing up any user provided one in - req->saved_cb*/ + int err; + VALUE_PAIR *vp; + struct rs_connection *conn; + + assert (request); + assert (request->conn); + conn = request->conn; + + request->req = req; /* take ownership */ + request->saved_cb = conn->callbacks; + + conn->callbacks.connected_cb = _rs_req_connected; + conn->callbacks.disconnected_cb = _rs_req_disconnected; + conn->callbacks.received_cb = _rs_req_packet_received; + conn->callbacks.sent_cb = _rs_req_packet_sent; - return -1; + assert(request->verified == 0); + + vp = paircreate(PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS); + pairadd(&request->req->rpkt->vps, vp); + + err = rs_packet_send(request->req, request); + if (err) + goto cleanup; + + err = rs_conn_receive_packet(request->conn, resp); + if (err) + goto cleanup; + + if (!request->verified) + { + err = rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL); + goto cleanup; + } + +cleanup: + conn->callbacks = request->saved_cb; + return err; +} + +/* + * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Alternatively, this software may be distributed under the terms of BSD + * license. + * + * See README and COPYING for more details. + */ +#include <openssl/md5.h> + +static int +_rs_decrypt_mppe(struct rs_request *request, VALUE_PAIR *vp) +{ + unsigned char *key = vp->vp_octets; + size_t len = vp->length; + unsigned char plain[1 + MAX_STRING_LEN], *ppos = plain, *res; + const unsigned char *pos; + size_t left, plen; + unsigned char hash[MD5_DIGEST_LENGTH]; + int i, first = 1; + const unsigned char *addr[3]; + struct rs_connection *conn; + + assert (request); + assert (request->conn); + conn = request->conn; + + if (vp->type != PW_TYPE_OCTETS) + return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL); + + pos = key + 2; + left = len - 2; + if (left % 16) + return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL); + + plen = left; + if (plen > MAX_STRING_LEN) + return rs_err_conn_push_fl (conn, RSE_BADAUTH, __FILE__, __LINE__, NULL); + + plain[0] = 0; + + while (left) + { + MD5_CTX md5; + + MD5_Init (&md5); + MD5_Update (&md5, conn->active_peer->secret, + strlen (conn->active_peer->secret)); + if (first) + { + MD5_Update (&md5, request->req->rpkt->vector, MD5_DIGEST_LENGTH); + MD5_Update (&md5, key, 2); + first = 0; + } + else + { + MD5_Update (&md5, pos - MD5_DIGEST_LENGTH, MD5_DIGEST_LENGTH); + } + MD5_Final (hash, &md5); + + for (i = 0; i < MD5_DIGEST_LENGTH; i++) + *ppos++ = *pos++ ^ hash[i]; + left -= MD5_DIGEST_LENGTH; + } + + if (plain[0] == 0 || plain[0] > plen - 1) + return rs_err_conn_push_fl (conn, RSE_NOMEM, __FILE__, __LINE__, NULL); + + memcpy (vp->vp_octets, plain + 1, plain[0]); + vp->length = plain[0]; + + return RSE_OK; } |