diff options
Diffstat (limited to 'src/libcharon/sa/ikev2/tasks/child_delete.c')
| -rw-r--r-- | src/libcharon/sa/ikev2/tasks/child_delete.c | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/src/libcharon/sa/ikev2/tasks/child_delete.c b/src/libcharon/sa/ikev2/tasks/child_delete.c new file mode 100644 index 000000000..eaaca2039 --- /dev/null +++ b/src/libcharon/sa/ikev2/tasks/child_delete.c @@ -0,0 +1,414 @@ +/* + * Copyright (C) 2006-2007 Martin Willi + * Hochschule fuer Technik Rapperswil + * + * 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 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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. + */ + +#include "child_delete.h" + +#include <daemon.h> +#include <encoding/payloads/delete_payload.h> + + +typedef struct private_child_delete_t private_child_delete_t; + +/** + * Private members of a child_delete_t task. + */ +struct private_child_delete_t { + + /** + * Public methods and task_t interface. + */ + child_delete_t public; + + /** + * Assigned IKE_SA. + */ + ike_sa_t *ike_sa; + + /** + * Are we the initiator? + */ + bool initiator; + + /** + * Protocol of CHILD_SA to delete + */ + protocol_id_t protocol; + + /** + * Inbound SPI of CHILD_SA to delete + */ + u_int32_t spi; + + /** + * whether to enforce delete action policy + */ + bool check_delete_action; + + /** + * is this delete exchange following a rekey? + */ + bool rekeyed; + + /** + * CHILD_SA already expired? + */ + bool expired; + + /** + * CHILD_SAs which get deleted + */ + linked_list_t *child_sas; +}; + +/** + * build the delete payloads from the listed child_sas + */ +static void build_payloads(private_child_delete_t *this, message_t *message) +{ + delete_payload_t *ah = NULL, *esp = NULL; + enumerator_t *enumerator; + child_sa_t *child_sa; + + enumerator = this->child_sas->create_enumerator(this->child_sas); + while (enumerator->enumerate(enumerator, (void**)&child_sa)) + { + protocol_id_t protocol = child_sa->get_protocol(child_sa); + u_int32_t spi = child_sa->get_spi(child_sa, TRUE); + + switch (protocol) + { + case PROTO_ESP: + if (esp == NULL) + { + esp = delete_payload_create(DELETE, PROTO_ESP); + message->add_payload(message, (payload_t*)esp); + } + esp->add_spi(esp, spi); + DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x", + protocol_id_names, protocol, ntohl(spi)); + break; + case PROTO_AH: + if (ah == NULL) + { + ah = delete_payload_create(DELETE, PROTO_AH); + message->add_payload(message, (payload_t*)ah); + } + ah->add_spi(ah, spi); + DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x", + protocol_id_names, protocol, ntohl(spi)); + break; + default: + break; + } + child_sa->set_state(child_sa, CHILD_DELETING); + } + enumerator->destroy(enumerator); +} + +/** + * read in payloads and find the children to delete + */ +static void process_payloads(private_child_delete_t *this, message_t *message) +{ + enumerator_t *payloads, *spis; + payload_t *payload; + delete_payload_t *delete_payload; + u_int32_t spi; + protocol_id_t protocol; + child_sa_t *child_sa; + + payloads = message->create_payload_enumerator(message); + while (payloads->enumerate(payloads, &payload)) + { + if (payload->get_type(payload) == DELETE) + { + delete_payload = (delete_payload_t*)payload; + protocol = delete_payload->get_protocol_id(delete_payload); + if (protocol != PROTO_ESP && protocol != PROTO_AH) + { + continue; + } + spis = delete_payload->create_spi_enumerator(delete_payload); + while (spis->enumerate(spis, &spi)) + { + child_sa = this->ike_sa->get_child_sa(this->ike_sa, protocol, + spi, FALSE); + if (child_sa == NULL) + { + DBG1(DBG_IKE, "received DELETE for %N CHILD_SA with SPI %.8x, " + "but no such SA", protocol_id_names, protocol, ntohl(spi)); + continue; + } + DBG1(DBG_IKE, "received DELETE for %N CHILD_SA with SPI %.8x", + protocol_id_names, protocol, ntohl(spi)); + + switch (child_sa->get_state(child_sa)) + { + case CHILD_REKEYING: + this->rekeyed = TRUE; + /* we reply as usual, rekeying will fail */ + break; + case CHILD_DELETING: + /* we don't send back a delete if we initiated ourself */ + if (!this->initiator) + { + this->ike_sa->destroy_child_sa(this->ike_sa, + protocol, spi); + continue; + } + /* fall through */ + case CHILD_INSTALLED: + if (!this->initiator) + { /* reestablish installed children if required */ + this->check_delete_action = TRUE; + } + default: + break; + } + if (this->child_sas->find_first(this->child_sas, NULL, + (void**)&child_sa) != SUCCESS) + { + this->child_sas->insert_last(this->child_sas, child_sa); + } + } + spis->destroy(spis); + } + } + payloads->destroy(payloads); +} + +/** + * destroy the children listed in this->child_sas, reestablish by policy + */ +static status_t destroy_and_reestablish(private_child_delete_t *this) +{ + enumerator_t *enumerator; + child_sa_t *child_sa; + child_cfg_t *child_cfg; + protocol_id_t protocol; + u_int32_t spi; + action_t action; + status_t status = SUCCESS; + + enumerator = this->child_sas->create_enumerator(this->child_sas); + while (enumerator->enumerate(enumerator, (void**)&child_sa)) + { + /* signal child down event if we are not rekeying */ + if (!this->rekeyed) + { + charon->bus->child_updown(charon->bus, child_sa, FALSE); + } + spi = child_sa->get_spi(child_sa, TRUE); + protocol = child_sa->get_protocol(child_sa); + child_cfg = child_sa->get_config(child_sa); + child_cfg->get_ref(child_cfg); + action = child_sa->get_close_action(child_sa); + this->ike_sa->destroy_child_sa(this->ike_sa, protocol, spi); + if (this->check_delete_action) + { /* enforce child_cfg policy if deleted passively */ + switch (action) + { + case ACTION_RESTART: + child_cfg->get_ref(child_cfg); + status = this->ike_sa->initiate(this->ike_sa, child_cfg, + child_sa->get_reqid(child_sa), NULL, NULL); + break; + case ACTION_ROUTE: + charon->traps->install(charon->traps, + this->ike_sa->get_peer_cfg(this->ike_sa), child_cfg, + child_sa->get_reqid(child_sa)); + break; + default: + break; + } + } + child_cfg->destroy(child_cfg); + if (status != SUCCESS) + { + break; + } + } + enumerator->destroy(enumerator); + return status; +} + +/** + * send closing signals for all CHILD_SAs over the bus + */ +static void log_children(private_child_delete_t *this) +{ + linked_list_t *my_ts, *other_ts; + enumerator_t *enumerator; + child_sa_t *child_sa; + u_int64_t bytes_in, bytes_out; + + enumerator = this->child_sas->create_enumerator(this->child_sas); + while (enumerator->enumerate(enumerator, (void**)&child_sa)) + { + my_ts = linked_list_create_from_enumerator( + child_sa->create_ts_enumerator(child_sa, TRUE)); + other_ts = linked_list_create_from_enumerator( + child_sa->create_ts_enumerator(child_sa, FALSE)); + if (this->expired) + { + DBG0(DBG_IKE, "closing expired CHILD_SA %s{%d} " + "with SPIs %.8x_i %.8x_o and TS %#R=== %#R", + child_sa->get_name(child_sa), child_sa->get_reqid(child_sa), + ntohl(child_sa->get_spi(child_sa, TRUE)), + ntohl(child_sa->get_spi(child_sa, FALSE)), my_ts, other_ts); + } + else + { + child_sa->get_usestats(child_sa, TRUE, NULL, &bytes_in, NULL); + child_sa->get_usestats(child_sa, FALSE, NULL, &bytes_out, NULL); + + DBG0(DBG_IKE, "closing CHILD_SA %s{%d} with SPIs %.8x_i " + "(%llu bytes) %.8x_o (%llu bytes) and TS %#R=== %#R", + child_sa->get_name(child_sa), child_sa->get_reqid(child_sa), + ntohl(child_sa->get_spi(child_sa, TRUE)), bytes_in, + ntohl(child_sa->get_spi(child_sa, FALSE)), bytes_out, + my_ts, other_ts); + } + my_ts->destroy(my_ts); + other_ts->destroy(other_ts); + } + enumerator->destroy(enumerator); +} + +METHOD(task_t, build_i, status_t, + private_child_delete_t *this, message_t *message) +{ + child_sa_t *child_sa; + + child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol, + this->spi, TRUE); + if (!child_sa) + { /* check if it is an outbound sa */ + child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol, + this->spi, FALSE); + if (!child_sa) + { /* child does not exist anymore */ + return SUCCESS; + } + /* we work only with the inbound SPI */ + this->spi = child_sa->get_spi(child_sa, TRUE); + } + this->child_sas->insert_last(this->child_sas, child_sa); + if (child_sa->get_state(child_sa) == CHILD_REKEYING) + { + this->rekeyed = TRUE; + } + log_children(this); + build_payloads(this, message); + return NEED_MORE; +} + +METHOD(task_t, process_i, status_t, + private_child_delete_t *this, message_t *message) +{ + process_payloads(this, message); + DBG1(DBG_IKE, "CHILD_SA closed"); + return destroy_and_reestablish(this); +} + +METHOD(task_t, process_r, status_t, + private_child_delete_t *this, message_t *message) +{ + process_payloads(this, message); + log_children(this); + return NEED_MORE; +} + +METHOD(task_t, build_r, status_t, + private_child_delete_t *this, message_t *message) +{ + /* if we are rekeying, we send an empty informational */ + if (this->ike_sa->get_state(this->ike_sa) != IKE_REKEYING) + { + build_payloads(this, message); + } + DBG1(DBG_IKE, "CHILD_SA closed"); + return destroy_and_reestablish(this); +} + +METHOD(task_t, get_type, task_type_t, + private_child_delete_t *this) +{ + return TASK_CHILD_DELETE; +} + +METHOD(child_delete_t , get_child, child_sa_t*, + private_child_delete_t *this) +{ + child_sa_t *child_sa = NULL; + this->child_sas->get_first(this->child_sas, (void**)&child_sa); + return child_sa; +} + +METHOD(task_t, migrate, void, + private_child_delete_t *this, ike_sa_t *ike_sa) +{ + this->check_delete_action = FALSE; + this->ike_sa = ike_sa; + + this->child_sas->destroy(this->child_sas); + this->child_sas = linked_list_create(); +} + +METHOD(task_t, destroy, void, + private_child_delete_t *this) +{ + this->child_sas->destroy(this->child_sas); + free(this); +} + +/* + * Described in header. + */ +child_delete_t *child_delete_create(ike_sa_t *ike_sa, protocol_id_t protocol, + u_int32_t spi, bool expired) +{ + private_child_delete_t *this; + + INIT(this, + .public = { + .task = { + .get_type = _get_type, + .migrate = _migrate, + .destroy = _destroy, + }, + .get_child = _get_child, + }, + .ike_sa = ike_sa, + .child_sas = linked_list_create(), + .protocol = protocol, + .spi = spi, + .expired = expired, + ); + + if (protocol != PROTO_NONE) + { + this->public.task.build = _build_i; + this->public.task.process = _process_i; + this->initiator = TRUE; + } + else + { + this->public.task.build = _build_r; + this->public.task.process = _process_r; + this->initiator = FALSE; + } + return &this->public; +} |