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Add the krb5/FreeIPA RADIUS companion daemon

Browse Source 
This daemon listens for RADIUS packets on a well known
UNIX domain socket. When a packet is received, it queries
LDAP to see if the user is configured for RADIUS authentication.
If so, then the packet is forwarded to the 3rd party RADIUS server.
Otherwise, a bind is attempted against the LDAP server.

https://fedorahosted.org/freeipa/ticket/3366
http://freeipa.org/page/V3/OTP
This commit is contained in:
Nathaniel McCallum
2013-04-11 14:03:25 -04:00
committed by Martin Kosek
parent 5d51ae50a5
commit 203754691c
15 changed files with 1723 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
daemons/Makefile.am
View File

@@ -16,6 +16,7 @@ SUBDIRS = \
ipa-kdb \
ipa-slapi-plugins \
ipa-sam \
ipa-otpd \
$(NULL)
DISTCLEANFILES = \

87
daemons/configure.ac
View File

@@ -79,63 +79,17 @@ dnl ---------------------------------------------------------------------------
dnl - Check for KRB5
dnl ---------------------------------------------------------------------------
KRB5_LIBS=
AC_CHECK_HEADER(krb5.h, [], [AC_MSG_ERROR([krb5.h not found])])
krb5_impl=mit
if test "x$ac_cv_header_krb5_h" = "xyes" ; then
dnl lazy check for Heimdal Kerberos
AC_CHECK_HEADERS(heim_err.h)
if test $ac_cv_header_heim_err_h = yes ; then
krb5_impl=heimdal
else
krb5_impl=mit
fi
if test "x$krb5_impl" = "xmit"; then
AC_CHECK_LIB(k5crypto, main,
[krb5crypto=k5crypto],
[krb5crypto=crypto])
AC_CHECK_LIB(krb5, main,
[have_krb5=yes
KRB5_LIBS="-lkrb5 -l$krb5crypto -lcom_err"],
[have_krb5=no],
[-l$krb5crypto -lcom_err])
elif test "x$krb5_impl" = "xheimdal"; then
AC_CHECK_LIB(des, main,
[krb5crypto=des],
[krb5crypto=crypto])
AC_CHECK_LIB(krb5, main,
[have_krb5=yes
KRB5_LIBS="-lkrb5 -l$krb5crypto -lasn1 -lroken -lcom_err"],
[have_krb5=no],
[-l$krb5crypto -lasn1 -lroken -lcom_err])
AC_DEFINE(HAVE_HEIMDAL_KERBEROS, 1,
[define if you have HEIMDAL Kerberos])
else
have_krb5=no
AC_MSG_WARN([Unrecognized Kerberos5 Implementation])
fi
if test "x$have_krb5" = "xyes" ; then
ol_link_krb5=yes
AC_DEFINE(HAVE_KRB5, 1,
[define if you have Kerberos V])
else
AC_MSG_ERROR([Required Kerberos 5 support not available])
fi
fi
AC_CHECK_HEADER(krad.h, [], [AC_MSG_ERROR([krad.h not found])])
AC_CHECK_LIB(krb5, main, [], [AC_MSG_ERROR([libkrb5 not found])])
AC_CHECK_LIB(k5crypto, main, [krb5crypto=k5crypto], [krb5crypto=crypto])
AC_CHECK_LIB(krad, main, [], [AC_MSG_ERROR([libkrad not found])])
KRB5_LIBS="-lkrb5 -l$krb5crypto -lcom_err"
KRAD_LIBS="-lkrad"
krb5kdcdir="${localstatedir}/kerberos/krb5kdc"
AC_SUBST(KRB5_LIBS)
AC_SUBST(KRAD_LIBS)
AC_SUBST(krb5kdcdir)
dnl ---------------------------------------------------------------------------
dnl - Check for Mozilla LDAP and OpenLDAP SDK
@@ -262,6 +216,11 @@ AC_CHECK_LIB([pdb],[pdb_enum_upn_suffixes],
[AC_MSG_WARN([libpdb does not have pdb_enum_upn_suffixes, no support for realm domains in ipasam])],
[$SAMBA40EXTRA_LIBPATH])
dnl ---------------------------------------------------------------------------
dnl Check for libverto
dnl ---------------------------------------------------------------------------
PKG_CHECK_MODULES([LIBVERTO], [libverto])
dnl ---------------------------------------------------------------------------
dnl - Check for check unit test framework http://check.sourceforge.net/
dnl ---------------------------------------------------------------------------
@@ -309,6 +268,20 @@ PKG_CHECK_MODULES([DIRSRV], [dirsrv >= 1.3.0])
dnl -- sss_idmap is needed by the extdom exop --
PKG_CHECK_MODULES([SSSIDMAP], [sss_idmap])
dnl ---------------------------------------------------------------------------
dnl - Check for systemd unit directory
dnl ---------------------------------------------------------------------------
PKG_CHECK_EXISTS([systemd], [], [AC_MSG_ERROR([systemd not found])])
AC_ARG_WITH([systemdsystemunitdir],
AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
[], [with_systemdsystemunitdir=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)])
AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
dnl ---------------------------------------------------------------------------
dnl - Check for program paths
dnl ---------------------------------------------------------------------------
AC_PATH_PROG(UNLINK, unlink, [AC_MSG_ERROR([unlink not found])])
dnl ---------------------------------------------------------------------------
dnl - Set the data install directory since we don't use pkgdatadir
dnl ---------------------------------------------------------------------------
@@ -373,6 +346,7 @@ AC_CONFIG_FILES([
Makefile
ipa-kdb/Makefile
ipa-sam/Makefile
ipa-otpd/Makefile
ipa-slapi-plugins/Makefile
ipa-slapi-plugins/ipa-cldap/Makefile
ipa-slapi-plugins/ipa-dns/Makefile
@@ -402,11 +376,14 @@ echo "
sysconfdir: ${sysconfdir}
localstatedir: ${localstatedir}
datadir: ${datadir}
krb5kdcdir: ${krb5kdcdir}
systemdsystemunitdir: ${systemdsystemunitdir}
source code location: ${srcdir}
compiler: ${CC}
cflags: ${CFLAGS}
LDAP libs: ${LDAP_LIBS}
KRB5 libs: ${KRB5_LIBS}
KRAD libs: ${KRAD_LIBS}
OpenSSL libs: ${SSL_LIBS}
Maintainer mode: ${USE_MAINTAINER_MODE}
"

21
daemons/ipa-otpd/Makefile.am Normal file
View File

@@ -0,0 +1,21 @@
AM_CFLAGS := $(CFLAGS) @LDAP_CFLAGS@ @LIBVERTO_CFLAGS@
AM_LDFLAGS := $(LDFLAGS) @LDAP_LIBS@ @LIBVERTO_LIBS@ @KRAD_LIBS@
noinst_HEADERS = internal.h
libexec_PROGRAMS = ipa-otpd
dist_noinst_DATA = ipa-otpd.socket.in ipa-otpd@.service.in test.py
systemdsystemunit_DATA = ipa-otpd.socket ipa-otpd@.service
ipa_otpd_SOURCES = bind.c forward.c main.c parse.c query.c queue.c stdio.c
%.socket: %.socket.in
@sed -e 's|@krb5kdcdir[@]|$(krb5kdcdir)|g' \
-e 's|@UNLINK[@]|@UNLINK@|g' \
$< > $@
%.service: %.service.in
@sed -e 's|@libexecdir[@]|$(libexecdir)|g' \
-e 's|@sysconfdir[@]|$(sysconfdir)|g' \
$< > $@
CLEANFILES = $(systemdsystemunit_DATA)

144
daemons/ipa-otpd/bind.c Normal file
View File

@@ -0,0 +1,144 @@
/*
* 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 takes requests from query.c and performs an LDAP bind on behalf
* of the user. The results are placed in the stdout queue (stdio.c).
*/
#include "internal.h"
static void on_bind_writable(verto_ctx *vctx, verto_ev *ev)
{
struct otpd_queue *push = &ctx.stdio.responses;
const krb5_data *data;
struct berval cred;
struct otpd_queue_item *item;
int i;
(void)vctx;
item = otpd_queue_pop(&ctx.bind.requests);
if (item == NULL) {
verto_set_flags(ctx.bind.io, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ);
return;
}
if (item->user.dn == NULL)
goto error;
data = krad_packet_get_attr(item->req,
krad_attr_name2num("User-Password"), 0);
if (data == NULL)
goto error;
cred.bv_val = data->data;
cred.bv_len = data->length;
i = ldap_sasl_bind(verto_get_private(ev), item->user.dn, LDAP_SASL_SIMPLE,
&cred, NULL, NULL, &item->msgid);
if (i != LDAP_SUCCESS) {
otpd_log_err(errno, "Unable to initiate bind: %s", ldap_err2string(i));
verto_break(ctx.vctx);
ctx.exitstatus = 1;
}
otpd_log_req(item->req, "bind start: %s", item->user.dn);
push = &ctx.bind.responses;
error:
otpd_queue_push(push, item);
}
static void on_bind_readable(verto_ctx *vctx, verto_ev *ev)
{
const char *errstr = "error";
LDAPMessage *results;
struct otpd_queue_item *item = NULL;
int i, rslt;
(void)vctx;
rslt = ldap_result(verto_get_private(ev), LDAP_RES_ANY, 0, NULL, &results);
if (rslt != LDAP_RES_BIND) {
if (rslt <= 0)
results = NULL;
ldap_msgfree(results);
return;
}
item = otpd_queue_pop_msgid(&ctx.bind.responses, ldap_msgid(results));
if (item == NULL) {
ldap_msgfree(results);
return;
}
item->msgid = -1;
rslt = ldap_parse_result(verto_get_private(ev), results, &i,
NULL, NULL, NULL, NULL, 0);
if (rslt != LDAP_SUCCESS) {
errstr = ldap_err2string(rslt);
goto error;
}
rslt = i;
if (rslt != LDAP_SUCCESS) {
errstr = ldap_err2string(rslt);
goto error;
}
item->sent = 0;
i = krad_packet_new_response(ctx.kctx, SECRET,
krad_code_name2num("Access-Accept"),
NULL, item->req, &item->rsp);
if (i != 0) {
errstr = krb5_get_error_message(ctx.kctx, i);
goto error;
}
error:
if (item != NULL)
otpd_log_req(item->req, "bind end: %s",
item->rsp != NULL ? "success" : errstr);
ldap_msgfree(results);
otpd_queue_push(&ctx.stdio.responses, item);
verto_set_flags(ctx.stdio.writer, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ |
VERTO_EV_FLAG_IO_WRITE);
}
void otpd_on_bind_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_bind_writable(vctx, ev);
if (flags & VERTO_EV_FLAG_IO_READ)
on_bind_readable(vctx, ev);
if (flags & VERTO_EV_FLAG_IO_ERROR) {
otpd_log_err(EIO, "IO error received on bind socket");
verto_break(ctx.vctx);
ctx.exitstatus = 1;
}
}

124
daemons/ipa-otpd/forward.c Normal file
View File

@@ -0,0 +1,124 @@
/*
* 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 proxies the incoming RADIUS request (stdio.c/query.c) to a
* third-party RADIUS server if the user is configured for forwarding. The
* result is placed in the stdout queue (stdio.c).
*/
#include "internal.h"
static void forward_cb(krb5_error_code retval, const krad_packet *request,
const krad_packet *response, void *data)
{
krad_code code, acpt;
struct otpd_queue_item *item = data;
(void)request;
acpt = krad_code_name2num("Access-Accept");
code = krad_packet_get_code(response);
if (retval == 0 && code == acpt) {
item->sent = 0;
retval = krad_packet_new_response(ctx.kctx, SECRET, acpt,
NULL, item->req, &item->rsp);
}
otpd_log_req(item->req, "forward end: %s",
retval == 0
? krad_code_num2name(code)
: krb5_get_error_message(ctx.kctx, retval));
otpd_queue_push(&ctx.stdio.responses, item);
verto_set_flags(ctx.stdio.writer, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ |
VERTO_EV_FLAG_IO_WRITE);
}
krb5_error_code otpd_forward(struct otpd_queue_item **item)
{
krad_attr usernameid, passwordid;
const krb5_data *password;
krb5_error_code retval;
char *username;
krb5_data data;
/* Find the username. */
username = (*item)->user.ipatokenRadiusUserName;
if (username == NULL) {
username = (*item)->user.other;
if (username == NULL)
username = (*item)->user.uid;
}
/* Check to see if we are supposed to forward. */
if ((*item)->radius.ipatokenRadiusServer == NULL ||
(*item)->radius.ipatokenRadiusSecret == NULL ||
username == NULL)
return 0;
otpd_log_req((*item)->req, "forward start: %s / %s", username,
(*item)->radius.ipatokenRadiusServer);
usernameid = krad_attr_name2num("User-Name");
passwordid = krad_attr_name2num("User-Password");
/* Set User-Name. */
data.data = username;
data.length = strlen(data.data);
retval = krad_attrset_add(ctx.attrs, usernameid, &data);
if (retval != 0)
goto error;
/* Set User-Password. */
password = krad_packet_get_attr((*item)->req, passwordid, 0);
if (password == NULL) {
krad_attrset_del(ctx.attrs, usernameid, 0);
goto error;
}
retval = krad_attrset_add(ctx.attrs, passwordid, password);
if (retval != 0) {
krad_attrset_del(ctx.attrs, usernameid, 0);
goto error;
}
/* Forward the request to the RADIUS server. */
retval = krad_client_send(ctx.client,
krad_code_name2num("Access-Request"),
ctx.attrs,
(*item)->radius.ipatokenRadiusServer,
(*item)->radius.ipatokenRadiusSecret,
(*item)->radius.ipatokenRadiusTimeout,
(*item)->radius.ipatokenRadiusRetries,
forward_cb, *item);
krad_attrset_del(ctx.attrs, usernameid, 0);
krad_attrset_del(ctx.attrs, passwordid, 0);
if (retval == 0)
*item = NULL;
error:
if (retval != 0)
otpd_log_req((*item)->req, "forward end: %s",
krb5_get_error_message(ctx.kctx, retval));
return retval;
}

153
daemons/ipa-otpd/internal.h Normal file
View File

@@ -0,0 +1,153 @@
/*
* 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/>.
*/
#ifndef INTERNAL_H_
#define INTERNAL_H_
#include "krad.h"
#include <ldap.h>
#include <errno.h>
#define SECRET ""
#define otpd_log_req(req, ...) \
otpd_log_req_(__FILE__, __LINE__, (req), __VA_ARGS__)
#define otpd_log_err(errnum, ...) \
otpd_log_err_(__FILE__, __LINE__, (errnum), __VA_ARGS__)
struct otpd_queue_iter;
struct otpd_queue_item {
struct otpd_queue_item *next;
krad_packet *req;
krad_packet *rsp;
size_t sent;
char *error;
struct {
char *dn;
char *uid;
char *ipatokenRadiusUserName;
char *ipatokenRadiusConfigLink;
char *other;
} user;
struct {
char *ipatokenUserMapAttribute;
char *ipatokenRadiusSecret;
char *ipatokenRadiusServer;
time_t ipatokenRadiusTimeout;
size_t ipatokenRadiusRetries;
} radius;
int msgid;
};
struct otpd_queue {
struct otpd_queue_item *head;
struct otpd_queue_item *tail;
};
/* This structure contains our global state. The most important part is the
* queues. When a request comes in (stdio.c), it is placed into an item object.
* This item exists in only one queue at a time as it flows through this
* daemon.
*
* The flow is: stdin => query => (forward (no queue) or bind) => stdout.
*/
struct otpd_context {
verto_ctx *vctx;
krb5_context kctx;
krad_client *client;
krad_attrset *attrs;
int exitstatus;
struct {
verto_ev *reader;
verto_ev *writer;
struct otpd_queue responses;
} stdio;
struct {
char *base;
verto_ev *io;
struct otpd_queue requests;
struct otpd_queue responses;
} query;
struct {
verto_ev *io;
struct otpd_queue requests;
struct otpd_queue responses;
} bind;
};
extern struct otpd_context ctx;
void otpd_log_req_(const char * const file, int line, krad_packet *req,
const char * const tmpl, ...);
void otpd_log_err_(const char * const file, int line, krb5_error_code code,
const char * const tmpl, ...);
krb5_error_code otpd_queue_item_new(krad_packet *req,
struct otpd_queue_item **item);
void otpd_queue_item_free(struct otpd_queue_item *item);
krb5_error_code otpd_queue_iter_new(const struct otpd_queue * const *queues,
struct otpd_queue_iter **iter);
const krad_packet *otpd_queue_iter_func(void *data, krb5_boolean cancel);
void otpd_queue_push(struct otpd_queue *q, struct otpd_queue_item *item);
void otpd_queue_push_head(struct otpd_queue *q, struct otpd_queue_item *item);
struct otpd_queue_item *otpd_queue_peek(struct otpd_queue *q);
struct otpd_queue_item *otpd_queue_pop(struct otpd_queue *q);
struct otpd_queue_item *otpd_queue_pop_msgid(struct otpd_queue *q, int msgid);
void otpd_queue_free_items(struct otpd_queue *q);
void otpd_on_stdin_readable(verto_ctx *vctx, verto_ev *ev);
void otpd_on_stdout_writable(verto_ctx *vctx, verto_ev *ev);
void otpd_on_query_io(verto_ctx *vctx, verto_ev *ev);
void otpd_on_bind_io(verto_ctx *vctx, verto_ev *ev);
krb5_error_code otpd_forward(struct otpd_queue_item **i);
const char *otpd_parse_user(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item);
const char *otpd_parse_radius(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item);
const char *otpd_parse_radius_username(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item);
#endif /* INTERNAL_H_ */

11
daemons/ipa-otpd/ipa-otpd.socket.in Normal file
View File

@@ -0,0 +1,11 @@
[Unit]
Description=ipa-otpd socket
[Socket]
ListenStream=@krb5kdcdir@/DEFAULT.socket
ExecStopPre=@UNLINK@ @krb5kdcdir@/DEFAULT.socket
SocketMode=0600
Accept=true
[Install]
WantedBy=krb5kdc.service

9
daemons/ipa-otpd/ipa-otpd@.service.in Normal file
View File

@@ -0,0 +1,9 @@
[Unit]
Description=ipa-otpd service
[Service]
EnvironmentFile=@sysconfdir@/ipa/default.conf
ExecStart=@libexecdir@/ipa-otpd $ldap_uri
StandardInput=socket
StandardOutput=socket
StandardError=syslog

340
daemons/ipa-otpd/main.c Normal file
View File

@@ -0,0 +1,340 @@
/*
* 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 initializes a systemd socket-activated daemon which receives
* RADIUS packets on STDIN and either proxies them to a third party RADIUS
* server or performs authentication directly by binding to the LDAP server.
* The choice between bind or proxy is made by evaluating LDAP configuration
* for the given user.
*/
#include "internal.h"
#include <signal.h>
#include <stdbool.h>
/* Our global state. */
struct otpd_context ctx;
/* Implementation function for logging a request's state. See internal.h. */
void otpd_log_req_(const char * const file, int line, krad_packet *req,
const char * const tmpl, ...)
{
const krb5_data *data;
va_list ap;
#ifdef DEBUG
if (file != NULL)
fprintf(stderr, "%8s:%03d: ", file, line);
#else
(void)file;
(void)line;
#endif
data = krad_packet_get_attr(req, krad_attr_name2num("User-Name"), 0);
if (data == NULL)
fprintf(stderr, "<unknown>: ");
else
fprintf(stderr, "%*s: ", data->length, data->data);
va_start(ap, tmpl);
vfprintf(stderr, tmpl, ap);
va_end(ap);
fprintf(stderr, "\n");
}
/* Implementation function for logging a generic error. See internal.h. */
void otpd_log_err_(const char * const file, int line, krb5_error_code code,
const char * const tmpl, ...)
{
const char *msg;
va_list ap;
if (file != NULL)
fprintf(stderr, "%10s:%03d: ", file, line);
if (code != 0) {
msg = krb5_get_error_message(ctx.kctx, code);
fprintf(stderr, "%s: ", msg);
krb5_free_error_message(ctx.kctx, msg);
}
va_start(ap, tmpl);
vfprintf(stderr, tmpl, ap);
va_end(ap);
fprintf(stderr, "\n");
}
static void on_ldap_free(verto_ctx *vctx, verto_ev *ev)
{
(void)vctx; /* Unused */
ldap_unbind_ext_s(verto_get_private(ev), NULL, NULL);
}
static void on_signal(verto_ctx *vctx, verto_ev *ev)
{
(void)ev; /* Unused */
fprintf(stderr, "Signaled, exiting...\n");
verto_break(vctx);
}
static char *find_base(LDAP *ldp)
{
LDAPMessage *results = NULL, *entry;
struct berval **vals = NULL;
struct timeval timeout;
int i, len;
char *base = NULL, *attrs[] = {
"namingContexts",
"defaultNamingContext",
NULL
};
timeout.tv_sec = -1;
i = ldap_search_ext_s(ldp, "", LDAP_SCOPE_BASE, NULL, attrs,
0, NULL, NULL, &timeout, 1, &results);
if (i != LDAP_SUCCESS) {
otpd_log_err(0, "Unable to search for query base: %s",
ldap_err2string(i));
goto egress;
}
entry = ldap_first_entry(ldp, results);
if (entry == NULL) {
otpd_log_err(0, "No entries found");
goto egress;
}
vals = ldap_get_values_len(ldp, entry, "defaultNamingContext");
if (vals == NULL) {
vals = ldap_get_values_len(ldp, entry, "namingContexts");
if (vals == NULL) {
otpd_log_err(0, "No namingContexts found");
goto egress;
}
}
len = ldap_count_values_len(vals);
if (len == 1)
base = strndup(vals[0]->bv_val, vals[0]->bv_len);
else
otpd_log_err(0, "Too many namingContexts found");
/* TODO: search multiple namingContexts to find the base? */
egress:
ldap_value_free_len(vals);
ldap_msgfree(results);
return base;
}
/* Set up an LDAP connection as a verto event. */
static krb5_error_code setup_ldap(const char *uri, krb5_boolean bind,
verto_callback *io, verto_ev **ev,
char **base)
{
struct timeval timeout;
int err, ver, fd;
char *basetmp;
LDAP *ldp;
err = ldap_initialize(&ldp, uri);
if (err != LDAP_SUCCESS)
return errno;
ver = LDAP_VERSION3;
ldap_set_option(ldp, LDAP_OPT_PROTOCOL_VERSION, &ver);
if (bind) {
err = ldap_sasl_bind_s(ldp, NULL, "EXTERNAL", NULL, NULL, NULL, NULL);
if (err != LDAP_SUCCESS)
return errno;
}
/* Always find the base since this forces open the socket. */
basetmp = find_base(ldp);
if (basetmp == NULL)
return ENOTCONN;
if (base != NULL)
*base = basetmp;
else
free(basetmp);
/* Set default timeout to just return immediately for async requests. */
memset(&timeout, 0, sizeof(timeout));
err = ldap_set_option(ldp, LDAP_OPT_TIMEOUT, &timeout);
if (err != LDAP_OPT_SUCCESS) {
ldap_unbind_ext_s(ldp, NULL, NULL);
return ENOMEM; /* What error code do I use? */
}
/* Get the file descriptor. */
if (ldap_get_option(ldp, LDAP_OPT_DESC, &fd) != LDAP_OPT_SUCCESS) {
ldap_unbind_ext_s(ldp, NULL, NULL);
return EINVAL;
}
*ev = verto_add_io(ctx.vctx, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ,
io, fd);
if (*ev == NULL) {
ldap_unbind_ext_s(ldp, NULL, NULL);
return ENOMEM; /* What error code do I use? */
}
verto_set_private(*ev, ldp, on_ldap_free);
return 0;
}
int main(int argc, char **argv)
{
char hostname[HOST_NAME_MAX + 1];
krb5_error_code retval;
krb5_data hndata;
verto_ev *sig;
if (argc != 2) {
fprintf(stderr, "Usage: %s <ldap_uri>\n", argv[0]);
return 1;
} else {
fprintf(stderr, "LDAP: %s\n", argv[1]);
}
memset(&ctx, 0, sizeof(ctx));
ctx.exitstatus = 1;
if (gethostname(hostname, sizeof(hostname)) < 0) {
otpd_log_err(errno, "Unable to get hostname");
goto error;
}
retval = krb5_init_context(&ctx.kctx);
if (retval != 0) {
otpd_log_err(retval, "Unable to initialize context");
goto error;
}
ctx.vctx = verto_new(NULL, VERTO_EV_TYPE_IO | VERTO_EV_TYPE_SIGNAL);
if (ctx.vctx == NULL) {
otpd_log_err(ENOMEM, "Unable to initialize event loop");
goto error;
}
/* Build attrset. */
retval = krad_attrset_new(ctx.kctx, &ctx.attrs);
if (retval != 0) {
otpd_log_err(retval, "Unable to initialize attrset");
goto error;
}
/* Set NAS-Identifier. */
hndata.data = hostname;
hndata.length = strlen(hndata.data);
retval = krad_attrset_add(ctx.attrs, krad_attr_name2num("NAS-Identifier"),
&hndata);
if (retval != 0) {
otpd_log_err(retval, "Unable to set NAS-Identifier");
goto error;
}
/* Set Service-Type. */
retval = krad_attrset_add_number(ctx.attrs,
krad_attr_name2num("Service-Type"),
KRAD_SERVICE_TYPE_AUTHENTICATE_ONLY);
if (retval != 0) {
otpd_log_err(retval, "Unable to set Service-Type");
goto error;
}
/* Radius Client */
retval = krad_client_new(ctx.kctx, ctx.vctx, &ctx.client);
if (retval != 0) {
otpd_log_err(retval, "Unable to initialize radius client");
goto error;
}
/* Signals */
sig = verto_add_signal(ctx.vctx, VERTO_EV_FLAG_NONE, on_signal, SIGTERM);
if (sig == NULL) {
otpd_log_err(ENOMEM, "Unable to initialize signal event");
goto error;
}
sig = verto_add_signal(ctx.vctx, VERTO_EV_FLAG_NONE, on_signal, SIGINT);
if (sig == NULL) {
otpd_log_err(ENOMEM, "Unable to initialize signal event");
goto error;
}
/* Standard IO */
ctx.stdio.reader = verto_add_io(ctx.vctx, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ,
otpd_on_stdin_readable, STDIN_FILENO);
if (ctx.stdio.reader == NULL) {
otpd_log_err(ENOMEM, "Unable to initialize reader event");
goto error;
}
ctx.stdio.writer = verto_add_io(ctx.vctx, VERTO_EV_FLAG_PERSIST |
VERTO_EV_FLAG_IO_ERROR |
VERTO_EV_FLAG_IO_READ,
otpd_on_stdout_writable, STDOUT_FILENO);
if (ctx.stdio.writer == NULL) {
otpd_log_err(ENOMEM, "Unable to initialize writer event");
goto error;
}
/* LDAP (Query) */
retval = setup_ldap(argv[1], TRUE, otpd_on_query_io,
&ctx.query.io, &ctx.query.base);
if (retval != 0) {
otpd_log_err(retval, "Unable to initialize LDAP (Query)");
goto error;
}
/* LDAP (Bind) */
retval = setup_ldap(argv[1], FALSE, otpd_on_bind_io,
&ctx.bind.io, NULL);
if (retval != 0) {
otpd_log_err(retval, "Unable to initialize LDAP (Bind)");
goto error;
}
ctx.exitstatus = 0;
verto_run(ctx.vctx);
error:
krad_client_free(ctx.client);
otpd_queue_free_items(&ctx.stdio.responses);
otpd_queue_free_items(&ctx.query.requests);
otpd_queue_free_items(&ctx.query.responses);
otpd_queue_free_items(&ctx.bind.requests);
otpd_queue_free_items(&ctx.bind.responses);
free(ctx.query.base);
verto_free(ctx.vctx);
krb5_free_context(ctx.kctx);
return ctx.exitstatus;
}

176
daemons/ipa-otpd/parse.c Normal file
View File

@@ -0,0 +1,176 @@
/*
* 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 parses the user's configuration received from LDAP (see query.c).
*/
#include "internal.h"
#include <ctype.h>
#define DEFAULT_TIMEOUT 15
#define DEFAULT_RETRIES 3
/* Convert an LDAP entry into an allocated string. */
static int get_string(LDAP *ldp, LDAPMessage *entry, const char *name,
char **out)
{
struct berval **vals;
ber_len_t i;
char *buf;
vals = ldap_get_values_len(ldp, entry, name);
if (vals == NULL)
return ENOENT;
buf = calloc(vals[0]->bv_len + 1, sizeof(char));
if (buf == NULL) {
ldap_value_free_len(vals);
return ENOMEM;
}
for (i = 0; i < vals[0]->bv_len; i++) {
if (!isprint(vals[0]->bv_val[i])) {
free(buf);
ldap_value_free_len(vals);
return EINVAL;
}
buf[i] = vals[0]->bv_val[i];
}
if (*out != NULL)
free(*out);
*out = buf;
ldap_value_free_len(vals);
return 0;
}
/* Convert an LDAP entry into an unsigned long. */
static int get_ulong(LDAP *ldp, LDAPMessage *entry, const char *name,
unsigned long *out)
{
struct berval **vals;
char buffer[32];
vals = ldap_get_values_len(ldp, entry, name);
if (vals == NULL)
return ENOENT;
if (vals[0]->bv_len > sizeof(buffer) - 1) {
ldap_value_free_len(vals);
return ERANGE;
}
memcpy(buffer, vals[0]->bv_val, vals[0]->bv_len);
buffer[vals[0]->bv_len] = '\0';
ldap_value_free_len(vals);
*out = strtoul(buffer, NULL, 10);
if (*out == ULONG_MAX)
return errno;
return 0;
}
/* Parse basic user configuration. */
const char *otpd_parse_user(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item)
{
int i, j;
i = get_string(ldp, entry, "uid", &item->user.uid);
if (i != 0)
return strerror(i);
i = get_string(ldp, entry, "ipatokenRadiusUserName",
&item->user.ipatokenRadiusUserName);
if (i != 0 && i != ENOENT)
return strerror(i);
i = get_string(ldp, entry, "ipatokenRadiusConfigLink",
&item->user.ipatokenRadiusConfigLink);
if (i != 0 && i != ENOENT)
return strerror(i);
/* Get the DN. */
item->user.dn = ldap_get_dn(ldp, entry);
if (item->user.dn == NULL) {
i = ldap_get_option(ldp, LDAP_OPT_RESULT_CODE, &j);
return ldap_err2string(i == LDAP_OPT_SUCCESS ? j : i);
}
return NULL;
}
/* Parse the user's RADIUS configuration. */
const char *otpd_parse_radius(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item)
{
unsigned long l;
int i;
i = get_string(ldp, entry, "ipatokenRadiusServer",
&item->radius.ipatokenRadiusServer);
if (i != 0)
return strerror(i);
i = get_string(ldp, entry, "ipatokenRadiusSecret",
&item->radius.ipatokenRadiusSecret);
if (i != 0)
return strerror(i);
i = get_string(ldp, entry, "ipatokenUserMapAttribute",
&item->radius.ipatokenUserMapAttribute);
if (i != 0 && i != ENOENT)
return strerror(i);
i = get_ulong(ldp, entry, "ipatokenRadiusTimeout", &l);
if (i == ENOENT)
l = DEFAULT_TIMEOUT;
else if (i != 0)
return strerror(i);
item->radius.ipatokenRadiusTimeout = l * 1000;
i = get_ulong(ldp, entry, "ipatokenRadiusRetries", &l);
if (i == ENOENT)
l = DEFAULT_RETRIES;
else if (i != 0)
return strerror(i);
item->radius.ipatokenRadiusRetries = l;
return NULL;
}
/* Parse the user's RADIUS username. */
const char *otpd_parse_radius_username(LDAP *ldp, LDAPMessage *entry,
struct otpd_queue_item *item)
{
int i;
i = get_string(ldp, entry, item->radius.ipatokenUserMapAttribute,
&item->user.other);
if (i != 0)
return strerror(i);
return NULL;
}

253
daemons/ipa-otpd/query.c Normal file
View File

@@ -0,0 +1,253 @@
/*
* 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;
}
}

183
daemons/ipa-otpd/queue.c Normal file
View File

@@ -0,0 +1,183 @@
/*
* 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 contains an implementation of a queue of request/response items.
*/
#include "internal.h"
struct otpd_queue_iter {
struct otpd_queue_item *next;
unsigned int qindx;
const struct otpd_queue * const *queues;
};
krb5_error_code otpd_queue_item_new(krad_packet *req,
struct otpd_queue_item **item)
{
*item = calloc(1, sizeof(struct otpd_queue_item));
if (*item == NULL)
return ENOMEM;
(*item)->req = req;
(*item)->msgid = -1;
return 0;
}
void otpd_queue_item_free(struct otpd_queue_item *item)
{
if (item == NULL)
return;
ldap_memfree(item->user.dn);
free(item->user.uid);
free(item->user.ipatokenRadiusUserName);
free(item->user.ipatokenRadiusConfigLink);
free(item->user.other);
free(item->radius.ipatokenRadiusServer);
free(item->radius.ipatokenRadiusSecret);
free(item->radius.ipatokenUserMapAttribute);
free(item->error);
krad_packet_free(item->req);
krad_packet_free(item->rsp);
free(item);
}
krb5_error_code otpd_queue_iter_new(const struct otpd_queue * const *queues,
struct otpd_queue_iter **iter)
{
*iter = calloc(1, sizeof(struct otpd_queue_iter));
if (*iter == NULL)
return ENOMEM;
(*iter)->queues = queues;
return 0;
}
/* This iterator function is used by krad to loop over all outstanding requests
* to check for duplicates. Hence, we have to iterate over all the queues to
* return all the outstanding requests as a flat list. */
const krad_packet *otpd_queue_iter_func(void *data, krb5_boolean cancel)
{
struct otpd_queue_iter *iter = data;
const struct otpd_queue *q;
if (cancel) {
free(iter);
return NULL;
}
if (iter->next != NULL) {
struct otpd_queue_item *tmp;
tmp = iter->next;
iter->next = tmp->next;
return tmp->req;
}
q = iter->queues[iter->qindx++];
if (q == NULL)
return otpd_queue_iter_func(data, TRUE);
iter->next = q->head;
return otpd_queue_iter_func(data, FALSE);
}
void otpd_queue_push(struct otpd_queue *q, struct otpd_queue_item *item)
{
if (item == NULL)
return;
if (q->tail == NULL)
q->head = q->tail = item;
else
q->tail = q->tail->next = item;
}
void otpd_queue_push_head(struct otpd_queue *q, struct otpd_queue_item *item)
{
if (item == NULL)
return;
if (q->head == NULL)
q->tail = q->head = item;
else {
item->next = q->head;
q->head = item;
}
}
struct otpd_queue_item *otpd_queue_peek(struct otpd_queue *q)
{
return q->head;
}
struct otpd_queue_item *otpd_queue_pop(struct otpd_queue *q)
{
struct otpd_queue_item *item;
if (q == NULL)
return NULL;
item = q->head;
if (item != NULL)
q->head = item->next;
if (q->head == NULL)
q->tail = NULL;
return item;
}
/* Remove and return an item from the queue with the given msgid. */
struct otpd_queue_item *otpd_queue_pop_msgid(struct otpd_queue *q, int msgid)
{
struct otpd_queue_item *item, **prev;
for (item = q->head, prev = &q->head;
item != NULL;
item = item->next, prev = &item->next) {
if (item->msgid == msgid) {
*prev = item->next;
if (q->head == NULL)
q->tail = NULL;
return item;
}
}
return NULL;
}
void otpd_queue_free_items(struct otpd_queue *q)
{
struct otpd_queue_item *item, *next;
next = q->head;
while (next != NULL) {
item = next;
next = next->next;
otpd_queue_item_free(item);
}
q->head = NULL;
q->tail = NULL;
}

205
daemons/ipa-otpd/stdio.c Normal file
View File

@@ -0,0 +1,205 @@
/*
* 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;
}

61
daemons/ipa-otpd/test.py Normal file
View File

@@ -0,0 +1,61 @@
#!/usr/bin/python
#
# 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/>.
import StringIO
import struct
import subprocess
import sys
try:
from pyrad import packet
from pyrad.dictionary import Dictionary
except ImportError:
sys.stdout.write("pyrad not found!\n")
sys.exit(0)
# We could use a dictionary file, but since we need
# such few attributes, we'll just include them here
DICTIONARY = """
ATTRIBUTE User-Name 1 string
ATTRIBUTE User-Password 2 string
ATTRIBUTE NAS-Identifier 32 string
"""
dct = Dictionary(StringIO.StringIO(DICTIONARY))
proc = subprocess.Popen(["./ipa-otpd", sys.argv[1]],
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
pkt = packet.AuthPacket(secret="", dict=dct)
pkt["User-Name"] = sys.argv[2]
pkt["User-Password"] = pkt.PwCrypt(sys.argv[3])
pkt["NAS-Identifier"] = "localhost"
proc.stdin.write(pkt.RequestPacket())
rsp = packet.Packet(secret="", dict=dict)
buf = proc.stdout.read(4)
buf += proc.stdout.read(struct.unpack("!BBH", buf)[2] - 4)
rsp.DecodePacket(buf)
pkt.VerifyReply(rsp)
proc.terminate() #pylint: disable=E1101
proc.wait()

9
freeipa.spec.in
View File

@@ -37,11 +37,7 @@ BuildRequires: nspr-devel
BuildRequires: nss-devel
BuildRequires: openssl-devel
BuildRequires: openldap-devel
%if 0%{?fedora} >= 19
BuildRequires: krb5-devel >= 1.11
%else
BuildRequires: krb5-devel >= 1.10
%endif
BuildRequires: krb5-workstation
BuildRequires: libuuid-devel
BuildRequires: libcurl-devel >= 7.21.7-2
@@ -73,6 +69,8 @@ BuildRequires: m2crypto
BuildRequires: check
BuildRequires: libsss_idmap-devel
BuildRequires: java-1.7.0-openjdk
BuildRequires: libverto-devel
BuildRequires: systemd
# Find out Kerberos middle version to infer ABI changes in DAL driver
# We cannot load DAL driver into KDC with wrong ABI.
@@ -639,6 +637,7 @@ fi
%{_sbindir}/ipa-upgradeconfig
%{_sbindir}/ipa-compliance
%{_libexecdir}/certmonger/dogtag-ipa-retrieve-agent-submit
%{_libexecdir}/ipa-otpd
%{_sysconfdir}/cron.d/ipa-compliance
%config(noreplace) %{_sysconfdir}/sysconfig/ipa_memcached
%dir %attr(0700,apache,apache) %{_localstatedir}/run/ipa_memcached/
@@ -647,6 +646,8 @@ fi
%config %{_sysconfdir}/tmpfiles.d/ipa.conf
%attr(644,root,root) %{_unitdir}/ipa.service
%attr(644,root,root) %{_unitdir}/ipa_memcached.service
%attr(644,root,root) %{_unitdir}/ipa-otpd.socket
%attr(644,root,root) %{_unitdir}/ipa-otpd@.service
# END
%dir %{python_sitelib}/ipaserver
%dir %{python_sitelib}/ipaserver/install