* POSSIBILITY OF SUCH DAMAGE.
*/
-/* So the basic design here is to have "authentication providers" that do
- * things like query ident and blacklists and even open proxies.
+/* The basic design here is to have "authentication providers" that do things
+ * like query ident and blacklists and even open proxies.
*
* Providers are registered in the auth_providers linked list. It is planned to
* use a bitmap to store provider ID's later.
*
- * Providers can either return failure immediately, immediate acceptance, or
- * do work in the background (calling set_provider to signal this).
+ * Providers can either return failure immediately, immediate acceptance, or do
+ * work in the background (calling set_provider to signal this).
*
* Provider-specific data for each client can be kept in an index of the data
* struct member (using the provider's ID).
* should call provider_done. Do NOT call this if you have accepted or rejected
* the client.
*
+ * Eventually, stuff like *:line handling will be moved here, but that means we
+ * have to talk to bandb directly first.
+ *
* --Elizafox, 9 March 2016
*/
+#include "stdinc.h"
#include "rb_dictionary.h"
+#include "rb_lib.h"
#include "authd.h"
#include "provider.h"
+#include "notice.h"
-rb_dlink_list auth_providers;
+static EVH provider_timeout_event;
-/* Clients waiting */
rb_dictionary *auth_clients;
+rb_dlink_list auth_providers;
-/* Load a provider */
-void load_provider(struct auth_provider *provider)
-{
- if(rb_dlink_list_length(&auth_providers) >= MAX_PROVIDERS)
- /* XXX should probably warn here */
- return;
-
- provider->init();
- rb_dlinkAdd(provider, &provider->node, &auth_providers);
-}
-
-void unload_provider(struct auth_provider *provider)
-{
- provider->destroy();
- rb_dlinkDelete(&provider->node, &auth_providers);
-}
+static rb_dlink_list free_pids;
+static uint32_t allocated_pids;
+static struct ev_entry *timeout_ev;
/* Initalise all providers */
-void init_providers(void)
+void
+init_providers(void)
{
auth_clients = rb_dictionary_create("pending auth clients", rb_uint32cmp);
+ timeout_ev = rb_event_addish("provider_timeout_event", provider_timeout_event, NULL, 1);
+
load_provider(&rdns_provider);
load_provider(&ident_provider);
+ load_provider(&blacklist_provider);
+ load_provider(&opm_provider);
}
/* Terminate all providers */
-void destroy_providers(void)
+void
+destroy_providers(void)
{
- rb_dlink_node *ptr;
+ rb_dlink_node *ptr, *nptr;
rb_dictionary_iter iter;
struct auth_client *auth;
- struct auth_provider *provider;
/* Cancel outstanding connections */
RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
{
+ auth_client_ref(auth);
+
/* TBD - is this the right thing? */
- reject_client(auth, 0, "Authentication system is down... try reconnecting in a few seconds");
+ reject_client(auth, UINT32_MAX, "destroy",
+ "Authentication system is down... try reconnecting in a few seconds");
+
+ auth_client_unref(auth);
}
- RB_DLINK_FOREACH(ptr, auth_providers.head)
+ RB_DLINK_FOREACH_SAFE(ptr, nptr, auth_providers.head)
{
- provider = ptr->data;
+ struct auth_provider *provider = ptr->data;
if(provider->destroy)
provider->destroy();
+
+ rb_dlinkDelete(ptr, &auth_providers);
}
+
+ rb_dictionary_destroy(auth_clients, NULL, NULL);
+ rb_event_delete(timeout_ev);
}
-/* Cancel outstanding providers for a client */
-void cancel_providers(struct auth_client *auth)
+/* Load a provider */
+void
+load_provider(struct auth_provider *provider)
{
- rb_dlink_node *ptr;
- struct auth_provider *provider;
+ /* Assign a PID */
+ if(rb_dlink_list_length(&free_pids) > 0)
+ {
+ /* use the free list */
+ provider->id = RB_POINTER_TO_UINT(free_pids.head->data);
+ rb_dlinkDestroy(free_pids.head, &free_pids);
+ }
+ else
+ {
+ if(allocated_pids == MAX_PROVIDERS || allocated_pids == UINT32_MAX)
+ {
+ warn_opers(L_WARN, "Cannot load additional provider, max reached!");
+ return;
+ }
- RB_DLINK_FOREACH(ptr, auth_providers.head)
+ provider->id = allocated_pids++;
+ }
+
+ if(provider->opt_handlers != NULL)
+ {
+ struct auth_opts_handler *handler;
+
+ for(handler = provider->opt_handlers; handler->option != NULL; handler++)
+ rb_dictionary_add(authd_option_handlers, handler->option, handler);
+ }
+
+ if(provider->stats_handler.letter != '\0')
+ authd_stat_handlers[(unsigned char)provider->stats_handler.letter] = provider->stats_handler.handler;
+
+ if(provider->init != NULL)
+ provider->init();
+
+ rb_dlinkAdd(provider, &provider->node, &auth_providers);
+}
+
+void
+unload_provider(struct auth_provider *provider)
+{
+ if(provider->opt_handlers != NULL)
{
- provider = ptr->data;
+ struct auth_opts_handler *handler;
- if(provider->cancel && is_provider(auth, provider->id))
- /* Cancel if required */
- provider->cancel(auth);
+ for(handler = provider->opt_handlers; handler->option != NULL; handler++)
+ rb_dictionary_delete(authd_option_handlers, handler->option);
}
+ if(provider->stats_handler.letter != '\0')
+ authd_stat_handlers[(unsigned char)provider->stats_handler.letter] = NULL;
+
+ if(provider->destroy != NULL)
+ provider->destroy();
+
+ rb_dlinkDelete(&provider->node, &auth_providers);
+
+ /* Reclaim ID */
+ rb_dlinkAddAlloc(RB_UINT_TO_POINTER(provider->id), &free_pids);
+}
+
+void
+auth_client_free(struct auth_client *auth)
+{
rb_dictionary_delete(auth_clients, RB_UINT_TO_POINTER(auth->cid));
+ rb_free(auth->data);
rb_free(auth);
}
+/* Cancel outstanding providers for a client (if any). */
+void
+cancel_providers(struct auth_client *auth)
+{
+ if(auth->providers_cancelled)
+ return;
+
+ auth->providers_cancelled = true;
+
+ if(auth->providers_active > 0)
+ {
+ rb_dlink_node *ptr;
+
+ RB_DLINK_FOREACH(ptr, auth_providers.head)
+ {
+ struct auth_provider *provider = ptr->data;
+
+ if(provider->cancel != NULL && is_provider_running(auth, provider->id))
+ /* Cancel if required */
+ provider->cancel(auth);
+ }
+ }
+}
+
/* Provider is done */
-void provider_done(struct auth_client *auth, provider_t id)
+void
+provider_done(struct auth_client *auth, uint32_t id)
{
rb_dlink_node *ptr;
- struct auth_provider *provider;
- unset_provider(auth, id);
+ lrb_assert(is_provider_running(auth, id));
+ lrb_assert(id != UINT32_MAX);
+ lrb_assert(id < allocated_pids);
+
+ set_provider_done(auth, id);
- if(!auth->providers)
+ if(auth->providers_active == 0 && !auth->providers_starting)
{
- /* No more providers, done */
- accept_client(auth, 0);
+ /* All done */
+ accept_client(auth);
return;
}
RB_DLINK_FOREACH(ptr, auth_providers.head)
{
- provider = ptr->data;
+ struct auth_provider *provider = ptr->data;
- if(provider->completed && is_provider(auth, provider->id))
+ if(provider->completed != NULL && is_provider_running(auth, provider->id))
/* Notify pending clients who asked for it */
provider->completed(auth, id);
}
}
-/* Reject a client */
-void reject_client(struct auth_client *auth, provider_t id, const char *reason)
+/* Reject a client and cancel any outstanding providers */
+void
+reject_client(struct auth_client *auth, uint32_t id, const char *data, const char *fmt, ...)
{
- char reject;
+ char buf[BUFSIZE];
+ va_list args;
- switch(id)
- {
- case PROVIDER_RDNS:
- reject = 'D';
- break;
- case PROVIDER_IDENT:
- reject = 'I';
- break;
- case PROVIDER_BLACKLIST:
- reject = 'B';
- break;
- default:
- reject = 'N';
- break;
- }
+ va_start(args, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
- /* TODO send back ident */
- rb_helper_write(authd_helper, "R %x %c :%s", auth->cid, reject, reason);
+ /* We send back username and hostname in case ircd wants to overrule our decision.
+ * In the future this may not be the case.
+ * --Elizafox
+ */
+ rb_helper_write(authd_helper, "R %x %c %s %s %s :%s",
+ auth->cid, id != UINT32_MAX ? auth->data[id].provider->letter : '*',
+ auth->username, auth->hostname,
+ data == NULL ? "*" : data, buf);
+
+ if(id != UINT32_MAX)
+ set_provider_done(auth, id);
- unset_provider(auth, id);
cancel_providers(auth);
}
-/* Accept a client, cancel outstanding providers if any */
-void accept_client(struct auth_client *auth, provider_t id)
+/* Accept a client and cancel outstanding providers if any */
+void
+accept_client(struct auth_client *auth)
{
- uint32_t cid = auth->cid;
-
rb_helper_write(authd_helper, "A %x %s %s", auth->cid, auth->username, auth->hostname);
-
- unset_provider(auth, id);
cancel_providers(auth);
}
-/* Send a notice to a client */
-void notice_client(struct auth_client *auth, const char *notice)
-{
- rb_helper_write(authd_helper, "N %x :%s", auth->cid, notice);
-}
-
/* Begin authenticating user */
-static void start_auth(const char *cid, const char *l_ip, const char *l_port, const char *c_ip, const char *c_port)
+static void
+start_auth(const char *cid, const char *l_ip, const char *l_port, const char *c_ip, const char *c_port)
{
- struct auth_provider *provider;
- struct auth_client *auth = rb_malloc(sizeof(struct auth_client));
- long lcid = strtol(cid, NULL, 16);
+ struct auth_client *auth;
+ unsigned long long lcid = strtoull(cid, NULL, 16);
rb_dlink_node *ptr;
- if(lcid >= UINT32_MAX)
+ if(lcid == 0 || lcid > UINT32_MAX)
return;
+ auth = rb_malloc(sizeof(struct auth_client));
+ auth_client_ref(auth);
auth->cid = (uint32_t)lcid;
+ if(rb_dictionary_find(auth_clients, RB_UINT_TO_POINTER(auth->cid)) == NULL)
+ rb_dictionary_add(auth_clients, RB_UINT_TO_POINTER(auth->cid), auth);
+ else
+ {
+ warn_opers(L_CRIT, "provider: duplicate client added via start_auth: %s", cid);
+ exit(EX_PROVIDER_ERROR);
+ }
+
rb_strlcpy(auth->l_ip, l_ip, sizeof(auth->l_ip));
auth->l_port = (uint16_t)atoi(l_port); /* should be safe */
+ (void) rb_inet_pton_sock(l_ip, (struct sockaddr *)&auth->l_addr);
+ SET_SS_PORT(&auth->l_addr, htons(auth->l_port));
rb_strlcpy(auth->c_ip, c_ip, sizeof(auth->c_ip));
auth->c_port = (uint16_t)atoi(c_port);
+ (void) rb_inet_pton_sock(c_ip, (struct sockaddr *)&auth->c_addr);
+ SET_SS_PORT(&auth->c_addr, htons(auth->c_port));
+
+ rb_strlcpy(auth->hostname, "*", sizeof(auth->hostname));
+ rb_strlcpy(auth->username, "*", sizeof(auth->username));
- rb_dictionary_add(auth_clients, RB_UINT_TO_POINTER(auth->cid), auth);
+ auth->data = rb_malloc(allocated_pids * sizeof(struct auth_client_data));
+ auth->providers_starting = true;
RB_DLINK_FOREACH(ptr, auth_providers.head)
{
- provider = ptr->data;
+ struct auth_provider *provider = ptr->data;
+
+ auth->data[provider->id].provider = provider;
+
+ lrb_assert(provider->start != NULL);
/* Execute providers */
if(!provider->start(auth))
- {
/* Rejected immediately */
- cancel_providers(auth);
- return;
- }
+ goto done;
+
+ if(auth->providers_cancelled)
+ break;
}
+ auth->providers_starting = false;
/* If no providers are running, accept the client */
- if(!auth->providers)
- accept_client(auth, 0);
+ if(auth->providers_active == 0)
+ accept_client(auth);
+
+done:
+ auth_client_unref(auth);
}
/* Callback for the initiation */
-void handle_new_connection(int parc, char *parv[])
+void
+handle_new_connection(int parc, char *parv[])
{
- if(parc < 7)
- return;
+ if(parc < 6)
+ {
+ warn_opers(L_CRIT, "provider: received too few params for new connection (6 expected, got %d)", parc);
+ exit(EX_PROVIDER_ERROR);
+ }
start_auth(parv[1], parv[2], parv[3], parv[4], parv[5]);
}
+
+void
+handle_cancel_connection(int parc, char *parv[])
+{
+ struct auth_client *auth;
+ unsigned long long lcid;
+
+ if(parc < 2)
+ {
+ warn_opers(L_CRIT, "provider: received too few params for new connection (2 expected, got %d)", parc);
+ exit(EX_PROVIDER_ERROR);
+ }
+
+ lcid = strtoull(parv[1], NULL, 16);
+ if(lcid == 0 || lcid > UINT32_MAX)
+ {
+ warn_opers(L_CRIT, "provider: got a request to cancel a connection that can't exist: %s", parv[1]);
+ exit(EX_PROVIDER_ERROR);
+ }
+
+ if((auth = rb_dictionary_retrieve(auth_clients, RB_UINT_TO_POINTER((uint32_t)lcid))) == NULL)
+ {
+ /* This could happen as a race if we've accepted/rejected but they cancel, so don't die here.
+ * --Elizafox */
+ return;
+ }
+
+ auth_client_ref(auth);
+ cancel_providers(auth);
+ auth_client_unref(auth);
+}
+
+static void
+provider_timeout_event(void *notused __unused)
+{
+ struct auth_client *auth;
+ rb_dictionary_iter iter;
+ const time_t curtime = rb_current_time();
+
+ RB_DICTIONARY_FOREACH(auth, &iter, auth_clients)
+ {
+ rb_dlink_node *ptr;
+
+ auth_client_ref(auth);
+
+ RB_DLINK_FOREACH(ptr, auth_providers.head)
+ {
+ struct auth_provider *provider = ptr->data;
+ const time_t timeout = get_provider_timeout(auth, provider->id);
+
+ if(is_provider_running(auth, provider->id) && provider->timeout != NULL &&
+ timeout > 0 && timeout < curtime)
+ {
+ provider->timeout(auth);
+ }
+ }
+
+ auth_client_unref(auth);
+ }
+}
projects / solanum.git / blobdiff