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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 receives requests (from stdio.c) and queries the LDAP server for
* the user's configuration. When the user's configuration is received, it is
* parsed (parse.c). Once the configuration is parsed, the request packet is
* either forwarded to a third-party RADIUS server (forward.c) or authenticated
* directly via an LDAP bind (bind.c) based on the configuration received.
*/
#define _GNU_SOURCE 1 /* for asprintf() */
#include "internal.h"
#include <ctype.h>
#define DEFAULT_TIMEOUT 15
#define DEFAULT_RETRIES 3
static char *user[] = {
"uid",
"ipatokenRadiusUserName",
"ipatokenRadiusConfigLink",
NULL
};
static char *radius[] = {
"ipatokenRadiusServer",
"ipatokenRadiusSecret",
"ipatokenRadiusTimeout",
"ipatokenRadiusRetries",
"ipatokenUserMapAttribute",
NULL
};
/* Send queued LDAP requests to the server. */
static void on_query_writable(verto_ctx *vctx, verto_ev *ev)
{
struct otpd_queue *push = &ctx.stdio.responses;
const krb5_data *princ = NULL;
char *filter = NULL, *attrs[2];
int i = LDAP_SUCCESS;
struct otpd_queue_item *item;
(void)vctx;
item = otpd_queue_pop(&ctx.query.requests);
if (item == NULL) {
verto_set_flags(ctx.query.io, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ);
return;
}
if (item->user.dn == NULL) {
princ = krad_packet_get_attr(item->req,
krad_attr_name2num("User-Name"), 0);
if (princ == NULL)
goto error;
otpd_log_req(item->req, "user query start");
if (asprintf(&filter, "(&(objectClass=Person)(krbPrincipalName=%*s))",
princ->length, princ->data) < 0)
goto error;
i = ldap_search_ext(verto_get_private(ev), ctx.query.base,
LDAP_SCOPE_SUBTREE, filter, user, 0, NULL,
NULL, NULL, 1, &item->msgid);
free(filter);
} else if (item->radius.ipatokenRadiusSecret == NULL) {
otpd_log_req(item->req, "radius query start: %s",
item->user.ipatokenRadiusConfigLink);
i = ldap_search_ext(verto_get_private(ev),
item->user.ipatokenRadiusConfigLink,
LDAP_SCOPE_BASE, NULL, radius, 0, NULL,
NULL, NULL, 1, &item->msgid);
} else if (item->radius.ipatokenUserMapAttribute != NULL) {
otpd_log_req(item->req, "username query start: %s",
item->radius.ipatokenUserMapAttribute);
attrs[0] = item->radius.ipatokenUserMapAttribute;
attrs[1] = NULL;
i = ldap_search_ext(verto_get_private(ev), item->user.dn,
LDAP_SCOPE_BASE, NULL, attrs, 0, NULL,
NULL, NULL, 1, &item->msgid);
}
if (i == LDAP_SUCCESS) {
item->sent++;
push = &ctx.query.responses;
}
error:
otpd_queue_push(push, item);
}
/* Read LDAP responses from the server. */
static void on_query_readable(verto_ctx *vctx, verto_ev *ev)
{
struct otpd_queue *push = &ctx.stdio.responses;
verto_ev *event = ctx.stdio.writer;
LDAPMessage *results, *entry;
struct otpd_queue_item *item = NULL;
const char *err;
LDAP *ldp;
int i;
(void)vctx;
ldp = verto_get_private(ev);
i = ldap_result(ldp, LDAP_RES_ANY, 0, NULL, &results);
if (i != LDAP_RES_SEARCH_ENTRY && i != LDAP_RES_SEARCH_RESULT) {
if (i <= 0)
results = NULL;
goto egress;
}
item = otpd_queue_pop_msgid(&ctx.query.responses, ldap_msgid(results));
if (item == NULL)
goto egress;
if (i == LDAP_RES_SEARCH_ENTRY) {
entry = ldap_first_entry(ldp, results);
if (entry == NULL)
goto egress;
err = NULL;
switch (item->sent) {
case 1:
err = otpd_parse_user(ldp, entry, item);
break;
case 2:
err = otpd_parse_radius(ldp, entry, item);
break;
case 3:
err = otpd_parse_radius_username(ldp, entry, item);
break;
default:
ldap_msgfree(entry);
goto egress;
}
ldap_msgfree(entry);
if (err != NULL) {
if (item->error != NULL)
free(item->error);
item->error = strdup(err);
if (item->error == NULL)
goto egress;
}
otpd_queue_push_head(&ctx.query.responses, item);
return;
}
item->msgid = -1;
switch (item->sent) {
case 1:
otpd_log_req(item->req, "user query end: %s",
item->error == NULL ? item->user.dn : item->error);
if (item->user.dn == NULL || item->user.uid == NULL)
goto egress;
break;
case 2:
otpd_log_req(item->req, "radius query end: %s",
item->error == NULL
? item->radius.ipatokenRadiusServer
: item->error);
if (item->radius.ipatokenRadiusServer == NULL ||
item->radius.ipatokenRadiusSecret == NULL)
goto egress;
break;
case 3:
otpd_log_req(item->req, "username query end: %s",
item->error == NULL ? item->user.other : item->error);
break;
default:
goto egress;
}
if (item->error != NULL)
goto egress;
if (item->sent == 1 && item->user.ipatokenRadiusConfigLink != NULL) {
push = &ctx.query.requests;
event = ctx.query.io;
goto egress;
} else if (item->sent == 2 &&
item->radius.ipatokenUserMapAttribute != NULL &&
item->user.ipatokenRadiusUserName == NULL) {
push = &ctx.query.requests;
event = ctx.query.io;
goto egress;
}
/* Forward to RADIUS if necessary. */
i = otpd_forward(&item);
if (i != 0)
goto egress;
push = &ctx.bind.requests;
event = ctx.bind.io;
egress:
ldap_msgfree(results);
otpd_queue_push(push, item);
if (item != NULL)
verto_set_flags(event, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ |
VERTO_EV_FLAG_IO_WRITE);
}
/* Handle the reading/writing of LDAP query requests asynchronously. */
void otpd_on_query_io(verto_ctx *vctx, verto_ev *ev)
{
verto_ev_flag flags;
flags = verto_get_fd_state(ev);
if (flags & VERTO_EV_FLAG_IO_WRITE)
on_query_writable(vctx, ev);
if (flags & VERTO_EV_FLAG_IO_READ)
on_query_readable(vctx, ev);
if (flags & VERTO_EV_FLAG_IO_ERROR) {
otpd_log_err(EIO, "IO error received on query socket");
verto_break(ctx.vctx);
ctx.exitstatus = 1;
}
}
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