authd: initial authentication framework implementation
Not plugged into anything yet, but compile-tested.
This commit is contained in:
Elizabeth Myers
parent
3ec1db3785
commit
05e17ac208
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@ -3,5 +3,5 @@ AM_CFLAGS=$(WARNFLAGS)
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AM_CPPFLAGS = -I../include -I../librb/include
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authd_SOURCES = authd.c res.c reslib.c dns.c
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authd_SOURCES = auth.c authd.c res.c reslib.c dns.c
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authd_LDADD = ../librb/src/librb.la
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250
authd/auth.c
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250
authd/auth.c
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@ -0,0 +1,250 @@
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/* authd/auth.c - authentication provider framework
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* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* So the basic design here is to have "authentication providers" that do
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* things like query ident and blacklists and even open proxies.
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*
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* Providers are registered statically in the struct auth_providers array. You will
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* probably want to add an item to the provider_t enum also.
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*
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* Providers can either return failure immediately, immediate acceptance, or
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* do work in the background (calling set_provider to signal this).
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*
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* It is up to providers to keep their own state on clients if they need to.
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*
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* All providers must implement at a minimum a perform_provider function. You
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* don't have to implement the others if you don't need them.
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*
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* Providers may kick clients off by rejecting them. Upon rejection, all
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* providers are cancelled. They can also unconditionally accept them.
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*
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* When a provider has done its work, it should call provider_done.
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*
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* --Elizafox, 9 March 2016
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*/
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#include "authd.h"
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#include "auth.h"
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/*****************************************************************************/
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/* This is just some test code for the system */
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bool dummy_init(void)
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{
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/* Do a dummy init */
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return true;
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}
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void dummy_destroy(void)
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{
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/* Do a dummy destroy */
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}
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bool dummy_start(struct auth_client *auth)
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{
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/* Set the client's username to testhost as a test */
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strcpy(auth->username, "testhost");
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return true;
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}
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void dummy_cancel(struct auth_client *auth)
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{
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/* Does nothing */
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}
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/*****************************************************************************/
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#define NULL_PROVIDER { \
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.provider = PROVIDER_NULL, \
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.init = NULL, \
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.destroy = NULL, \
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.start = NULL, \
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.cancel = NULL, \
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.completed = NULL, \
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}
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#define DUMMY_PROVIDER { \
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.provider = PROVIDER_DUMMY, \
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.init = dummy_init, \
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.destroy = dummy_destroy, \
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.start = dummy_start, \
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.cancel = dummy_cancel, \
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.completed = NULL, \
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}
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/* Providers */
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static struct auth_provider auth_providers[] =
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{
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NULL_PROVIDER,
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DUMMY_PROVIDER
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};
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/* Clients waiting */
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struct auth_client auth_clients[MAX_CLIENTS];
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/* Initalise all providers */
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void init_providers(void)
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{
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struct auth_provider *pptr;
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AUTH_PROVIDER_FOREACH(pptr)
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{
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if(pptr->init && !pptr->init())
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/* Provider failed to init, time to go */
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exit(1);
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}
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}
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/* Terminate all providers */
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void destroy_providerss(void)
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{
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struct auth_provider *pptr;
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/* Cancel outstanding connections */
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for (size_t i = 0; i < MAX_CLIENTS; i++)
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{
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if(auth_clients[i].cid)
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{
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/* TBD - is this the right thing?
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* (NOTE - this error message is designed for morons) */
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reject_client(&auth_clients[i],
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"IRC server reloading... try reconnecting in a few seconds");
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}
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}
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AUTH_PROVIDER_FOREACH(pptr)
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{
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if(pptr->destroy)
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pptr->destroy();
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}
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}
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/* Cancel outstanding providers for a client */
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void cancel_providers(struct auth_client *auth)
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{
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struct auth_provider *pptr;
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AUTH_PROVIDER_FOREACH(pptr)
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{
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if(pptr->cancel && is_provider(auth, pptr->provider))
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/* Cancel if required */
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pptr->cancel(auth);
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}
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}
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/* Provider is done */
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void provider_done(struct auth_client *auth, provider_t provider)
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{
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struct auth_provider *pptr;
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unset_provider(auth, provider);
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if(!auth->providers)
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{
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/* No more providers, done */
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accept_client(auth);
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return;
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}
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AUTH_PROVIDER_FOREACH(pptr)
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{
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if(pptr->completed && is_provider(auth, pptr->provider))
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/* Notify pending clients who asked for it */
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pptr->completed(auth, provider);
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}
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}
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/* Reject a client, cancel outstanding providers if any */
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void reject_client(struct auth_client *auth, const char *reason)
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{
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uint16_t cid = auth->cid;
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rb_helper_write(authd_helper, "R %x :%s", auth->cid, reason);
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if(auth->providers)
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cancel_providers(auth);
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memset(&auth_clients[cid], 0, sizeof(struct auth_client));
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}
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/* Accept a client, cancel outstanding providers if any */
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void accept_client(struct auth_client *auth)
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{
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uint16_t cid = auth->cid;
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rb_helper_write(authd_helper, "A %x %s %s", auth->cid, auth->username, auth->hostname);
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if(auth->providers)
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cancel_providers(auth);
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memset(&auth_clients[cid], 0, sizeof(struct auth_client));
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}
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/* Send a notice to a client */
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void notice_client(struct auth_client *auth, const char *notice)
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{
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rb_helper_write(authd_helper, "N %x :%s", auth->cid, notice);
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}
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/* Begin authenticating user */
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void start_auth(const char *cid, const char *l_ip, const char *l_port, const char *c_ip, const char *c_port)
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{
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struct auth_provider *pptr;
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struct auth_client *auth;
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long lcid = strtol(cid, NULL, 16);
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if(lcid >= MAX_CLIENTS)
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return;
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auth = &auth_clients[lcid];
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if(auth->cid != 0)
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/* Shouldn't get here */
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return;
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auth->cid = (uint16_t)lcid;
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rb_strlcpy(auth->l_ip, l_ip, sizeof(auth->l_ip));
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auth->l_port = (uint16_t)atoi(l_port); /* Safe cast, port shouldn't exceed 16 bits */
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rb_strlcpy(auth->c_ip, c_ip, sizeof(auth->c_ip));
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auth->c_port = (uint16_t)atoi(c_port);
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AUTH_PROVIDER_FOREACH(pptr)
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{
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/* Execute providers */
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if(!pptr->start(auth))
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{
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/* Rejected immediately */
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cancel_providers(auth);
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return;
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}
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}
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/* If no providers are running, accept the client */
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if(!auth->providers)
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accept_client(auth);
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}
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/* Callback for the initiation */
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void handle_new_connection(int parc, char *parv[])
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{
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if(parc < 5)
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return;
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start_auth(parv[1], parv[2], parv[3], parv[4], parv[5]);
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}
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107
authd/auth.h
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107
authd/auth.h
Normal file
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@ -0,0 +1,107 @@
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/* authd/auth.h - authentication provider framework
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* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CHARYBDIS_AUTHD_AUTH_H__
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#define __CHARYBDIS_AUTHD_AUTH_H__
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#include "stdinc.h"
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/* Arbitrary limit */
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#define MAX_CLIENTS 1024
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/* Registered providers */
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typedef enum
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{
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PROVIDER_NULL = 0x0, /* Dummy value */
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PROVIDER_RDNS = 0x1,
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PROVIDER_IDENT = 0x2,
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PROVIDER_BLACKLIST = 0x4,
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PROVIDER_DUMMY = 0x8,
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} provider_t;
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struct auth_client
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{
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uint16_t cid; /* Client ID */
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char l_ip[HOSTIPLEN + 1]; /* Listener IP address */
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uint16_t l_port; /* Listener port */
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char c_ip[HOSTIPLEN + 1]; /* Client IP address */
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uint16_t c_port; /* Client port */
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char hostname[IRCD_RES_HOSTLEN + 1]; /* Used for DNS lookup */
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char username[USERLEN + 1]; /* Used for ident lookup */
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unsigned int providers; /* Providers at work,
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* none left when set to 0 */
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};
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typedef bool (*provider_init_t)(void);
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typedef bool (*provider_perform_t)(struct auth_client *);
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typedef void (*provider_complete_t)(struct auth_client *, provider_t provider);
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typedef void (*provider_cancel_t)(struct auth_client *);
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typedef void (*provider_destroy_t)(void);
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struct auth_provider
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{
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provider_t provider;
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provider_init_t init; /* Initalise the provider */
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provider_destroy_t destroy; /* Terminate the provider */
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provider_perform_t start; /* Perform authentication */
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provider_cancel_t cancel; /* Authentication cancelled */
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provider_complete_t completed; /* Callback for when other performers complete (think dependency chains) */
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};
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#define AUTH_PROVIDER_FOREACH(a) for((a) = auth_providers; (a)->provider; (a)++)
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void init_providers(void);
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void destroy_providers(void);
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void cancel_providers(struct auth_client *auth);
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void provider_done(struct auth_client *auth, provider_t provider);
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void reject_client(struct auth_client *auth, const char *reason);
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void accept_client(struct auth_client *auth);
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void notice_client(struct auth_client *auth, const char *notice);
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void start_auth(const char *cid, const char *l_ip, const char *l_port, const char *c_ip, const char *c_port);
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void handle_new_connection(int parc, char *parv[]);
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/* Provider is operating on this auth_client (set this if you have async work to do) */
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static inline void set_provider(struct auth_client *auth, provider_t provider)
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{
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auth->providers |= provider;
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}
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/* Provider is no longer operating on this auth client (you should use provider_done) */
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static inline void unset_provider(struct auth_client *auth, provider_t provider)
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{
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auth->providers &= ~provider;
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}
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/* Check if provider is operating on this auth client */
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static inline bool is_provider(struct auth_client *auth, provider_t provider)
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{
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return auth->providers & provider;
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}
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#endif /* __CHARYBDIS_AUTHD_AUTH_H__ */
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