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/*
* FreeIPA 2FA companion daemon
*
* Authors: Nathaniel McCallum <npmccallum@redhat.com>
*
* Copyright (C) 2013 Nathaniel McCallum, Red Hat
* see file 'COPYING' for use and warranty information
*
* This program is free software you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This file reads and writes RADIUS packets on STDIN/STDOUT.
*
* Incoming requests are placed into a "query" queue to look up the user's
* configuration from LDAP (query.c).
*/
#include "internal.h"
static const struct otpd_queue *const queues[] = {
&ctx.stdio.responses,
&ctx.query.requests,
&ctx.query.responses,
&ctx.bind.requests,
&ctx.bind.responses,
NULL
};
/* Read a RADIUS request from stdin. */
void otpd_on_stdin_readable(verto_ctx *vctx, verto_ev *ev)
{
static char _buffer[KRAD_PACKET_SIZE_MAX];
static krb5_data buffer = { .data = _buffer, .length = 0 };
(void)vctx;
const krad_packet *dup;
const krb5_data *data;
struct otpd_queue_iter *iter;
struct otpd_queue_item *item;
krad_packet *req;
ssize_t pktlen;
int i;
pktlen = krad_packet_bytes_needed(&buffer);
if (pktlen < 0) {
otpd_log_err(EBADMSG, "Received a malformed packet");
goto shutdown;
}
/* Read the item. */
i = read(verto_get_fd(ev), buffer.data + buffer.length, pktlen);
if (i < 1) {
/* On EOF, shutdown gracefully. */
if (i == 0) {
fprintf(stderr, "Socket closed, shutting down...\n");
verto_break(ctx.vctx);
return;
}
if (errno != EAGAIN && errno != EINTR) {
otpd_log_err(errno, "Error receiving packet");
goto shutdown;
}
return;
}
/* If we have a partial read or just the header, try again. */
buffer.length += i;
pktlen = krad_packet_bytes_needed(&buffer);
if (pktlen > 0)
return;
/* Create the iterator. */
i = otpd_queue_iter_new(queues, &iter);
if (i != 0) {
otpd_log_err(i, "Unable to create iterator");
goto shutdown;
}
/* Decode the item. */
i = krad_packet_decode_request(ctx.kctx, SECRET, &buffer,
otpd_queue_iter_func, iter, &dup, &req);
buffer.length = 0;
if (i == EAGAIN)
return;
else if (i != 0) {
otpd_log_err(i, "Unable to decode item");
goto shutdown;
}
/* Drop duplicate requests. */
if (dup != NULL) {
krad_packet_free(req);
return;
}
/* Ensure the packet has the User-Name attribute. */
data = krad_packet_get_attr(req, krad_attr_name2num("User-Name"), 0);
if (data == NULL) {
krad_packet_free(req);
return;
}
/* Create the new queue item. */
i = otpd_queue_item_new(req, &item);
if (i != 0) {
krad_packet_free(req);
return;
}
/* Push it to the query queue. */
otpd_queue_push(&ctx.query.requests, item);
verto_set_flags(ctx.query.io, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ |
VERTO_EV_FLAG_IO_WRITE);
otpd_log_req(req, "request received");
return;
shutdown:
verto_break(ctx.vctx);
ctx.exitstatus = 1;
}
/* Send a RADIUS response to stdout. */
void otpd_on_stdout_writable(verto_ctx *vctx, verto_ev *ev)
{
const krb5_data *data;
struct otpd_queue_item *item;
int i;
(void)vctx;
item = otpd_queue_peek(&ctx.stdio.responses);
if (item == NULL) {
verto_set_flags(ctx.stdio.writer, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ);
return;
}
/* If no response has been generated thus far, send Access-Reject. */
if (item->rsp == NULL) {
item->sent = 0;
i = krad_packet_new_response(ctx.kctx, SECRET,
krad_code_name2num("Access-Reject"),
NULL, item->req, &item->rsp);
if (i != 0) {
otpd_log_err(errno, "Unable to craft response");
goto shutdown;
}
}
/* Send the packet. */
data = krad_packet_encode(item->rsp);
i = write(verto_get_fd(ev), data->data + item->sent,
data->length - item->sent);
if (i < 0) {
switch (errno) {
#if defined(EWOULDBLOCK) && (!defined(EAGAIN) || EAGAIN - EWOULDBLOCK != 0)
case EWOULDBLOCK:
#endif
#if defined(EAGAIN)
case EAGAIN:
#endif
case ENOBUFS:
case EINTR:
/* In this case, we just need to try again. */
return;
default:
/* Unrecoverable. */
break;
}
otpd_log_err(errno, "Error writing to stdout!");
goto shutdown;
}
/* If the packet was completely sent, free the response. */
item->sent += i;
if (item->sent == data->length) {
otpd_log_req(item->req, "response sent: %s",
krad_code_num2name(krad_packet_get_code(item->rsp)));
otpd_queue_item_free(otpd_queue_pop(&ctx.stdio.responses));
}
return;
shutdown:
verto_break(ctx.vctx);
ctx.exitstatus = 1;
}
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