X-Git-Url: https://jfr.im/git/solanum.git/blobdiff_plain/a52c7a8e693a11cbfd02c94e2ea0676b04d09343..d1f8acb0da1a84465c959d93abf0424c0b652c1a:/authd/provider.c

diff --git a/authd/provider.c b/authd/provider.c
index 31ef7816..7def5714 100644
--- a/authd/provider.c
+++ b/authd/provider.c
@@ -18,14 +18,14 @@
  * 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).
@@ -40,200 +40,366 @@
  * 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);
+	}
+}