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open5gs/src/sepp/sbi-path.c

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/*
* Copyright (C) 2023 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 <https://www.gnu.org/licenses/>.
*/
#include "sbi-path.h"
static int request_handler(ogs_sbi_request_t *request, void *data);
static int response_handler(
int status, ogs_sbi_response_t *response, void *data);
static void copy_request(
ogs_sbi_request_t *target, ogs_sbi_request_t *source,
bool do_not_remove_custom_header);
int sepp_sbi_open(void)
{
ogs_sbi_nf_instance_t *nf_instance = NULL;
/* Initialize SELF NF instance */
nf_instance = ogs_sbi_self()->nf_instance;
ogs_assert(nf_instance);
ogs_sbi_nf_fsm_init(nf_instance);
/* Build NF instance information. It will be transmitted to NRF. */
ogs_sbi_nf_instance_build_default(nf_instance);
/* Initialize NRF NF Instance */
nf_instance = ogs_sbi_self()->nrf_instance;
if (nf_instance)
ogs_sbi_nf_fsm_init(nf_instance);
if (ogs_sbi_server_start_all(request_handler) != OGS_OK)
return OGS_ERROR;
return OGS_OK;
}
void sepp_sbi_close(void)
{
ogs_sbi_client_stop_all();
ogs_sbi_server_stop_all();
}
bool sepp_n32c_handshake_send_security_capability_request(
sepp_node_t *sepp_node, bool none)
{
bool rc;
ogs_sbi_request_t *request = NULL;
ogs_sbi_client_t *client = NULL;
ogs_assert(sepp_node);
client = sepp_node->client;
if (!client) {
ogs_error("No Client");
return false;
}
request = sepp_n32c_handshake_build_security_capability_request(
sepp_node, none);
if (!request) {
ogs_error("sepp_n32c_handshake_build_exchange_capability() failed");
return false;
}
rc = ogs_sbi_client_send_request(
client, ogs_sbi_client_handler, request, sepp_node);
ogs_expect(rc == true);
ogs_sbi_request_free(request);
return rc;
}
void sepp_n32c_handshake_send_security_capability_response(
sepp_node_t *sepp_node, ogs_sbi_stream_t *stream)
{
ogs_sbi_message_t sendmsg;
ogs_sbi_response_t *response = NULL;
OpenAPI_sec_negotiate_rsp_data_t SecNegotiateRspData;
OpenAPI_list_t *PlmnIdList = NULL;
OpenAPI_plmn_id_t *PlmnId = NULL;
int i;
OpenAPI_lnode_t *node = NULL;
ogs_assert(sepp_self()->sender);
ogs_assert(sepp_node);
ogs_assert(stream);
memset(&SecNegotiateRspData, 0, sizeof(SecNegotiateRspData));
SecNegotiateRspData.sender = sepp_self()->sender;
SecNegotiateRspData.selected_sec_capability =
sepp_node->negotiated_security_scheme;
if (SecNegotiateRspData.selected_sec_capability !=
OpenAPI_security_capability_NONE) {
if (sepp_node->target_apiroot_supported == true) {
SecNegotiateRspData.is__3_gpp_sbi_target_api_root_supported = true;
SecNegotiateRspData._3_gpp_sbi_target_api_root_supported = 1;
}
}
PlmnIdList = OpenAPI_list_create();
ogs_assert(PlmnIdList);
for (i = 0; i < ogs_local_conf()->num_of_serving_plmn_id; i++) {
PlmnId = ogs_sbi_build_plmn_id(&ogs_local_conf()->serving_plmn_id[i]);
ogs_assert(PlmnId);
OpenAPI_list_add(PlmnIdList, PlmnId);
}
if (PlmnIdList->count)
SecNegotiateRspData.plmn_id_list = PlmnIdList;
else
OpenAPI_list_free(PlmnIdList);
SecNegotiateRspData.supported_features =
ogs_uint64_to_string(sepp_node->supported_features);
ogs_assert(SecNegotiateRspData.supported_features);
memset(&sendmsg, 0, sizeof(sendmsg));
sendmsg.SecNegotiateRspData = &SecNegotiateRspData;
response = ogs_sbi_build_response(&sendmsg, OGS_SBI_HTTP_STATUS_OK);
ogs_assert(response);
ogs_assert(true == ogs_sbi_server_send_response(stream, response));
OpenAPI_list_for_each(SecNegotiateRspData.plmn_id_list, node) {
PlmnId = node->data;
if (PlmnId)
ogs_sbi_free_plmn_id(PlmnId);
}
OpenAPI_list_free(SecNegotiateRspData.plmn_id_list);
if (SecNegotiateRspData.supported_features)
ogs_free(SecNegotiateRspData.supported_features);
}
static int request_handler(ogs_sbi_request_t *request, void *data)
{
int rv;
ogs_hash_index_t *hi;
ogs_sbi_client_t *client = NULL, *scp_client = NULL;
ogs_sbi_stream_t *stream = data;
ogs_sbi_server_t *server = NULL;
ogs_sbi_request_t sepp_request;
char *apiroot = NULL, *newuri = NULL;
sepp_assoc_t *assoc = NULL;
struct {
char *target_apiroot;
char *callback;
char *nrf_uri;
} headers = {
NULL, NULL, NULL
};
sepp_event_t *e = NULL;
ogs_assert(request);
ogs_assert(request->h.uri);
ogs_assert(stream);
server = ogs_sbi_server_from_stream(stream);
ogs_assert(server);
/* Extract HTTP Header */
for (hi = ogs_hash_first(request->http.headers);
hi; hi = ogs_hash_next(hi)) {
char *key = (char *)ogs_hash_this_key(hi);
char *val = ogs_hash_this_val(hi);
if (!key || !val) {
ogs_error("No Key[%s] Value[%s]", key, val);
continue;
}
/*
* <RFC 2616>
* Each header field consists of a name followed by a colon (":")
* and the field value. Field names are case-insensitive.
*/
if (!strcasecmp(key, OGS_SBI_CUSTOM_TARGET_APIROOT)) {
headers.target_apiroot = val;
}
}
if (headers.target_apiroot) {
bool rc;
sepp_node_t *sepp_node = NULL;
bool do_not_remove_custom_header;
assoc = sepp_assoc_add(stream);
if (!assoc) {
ogs_error("sepp_assoc_add() failed");
return OGS_ERROR;
}
do_not_remove_custom_header = true;
if (ogs_sbi_fqdn_in_vplmn(headers.target_apiroot) == true) {
uint16_t mcc = 0, mnc = 0;
if (server->interface) {
ogs_error("[DROP] Peer SEPP is using "
"the wrong interface[%s]", server->interface);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
mcc = ogs_plmn_id_mcc_from_fqdn(headers.target_apiroot);
ogs_assert(mcc);
mnc = ogs_plmn_id_mnc_from_fqdn(headers.target_apiroot);
ogs_assert(mnc);
/*
* Different PLMN : FROM c-SEPP TO p-SEPP
*/
sepp_node = sepp_node_find_by_plmn_id(mcc, mnc);
if (!sepp_node) {
ogs_error("Cannot find SEPP Peer Node [%s:%d:%d]",
headers.target_apiroot, mcc, mnc);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
client = NF_INSTANCE_CLIENT(&sepp_node->n32f);
if (!client) {
client = NF_INSTANCE_CLIENT(sepp_node);
if (!client) {
ogs_error("No Client in SEPP Peer Node [%s:%d:%d]",
headers.target_apiroot, mcc, mnc);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
}
/* Client ApiRoot */
apiroot = ogs_sbi_client_apiroot(client);
ogs_assert(apiroot);
} else {
/*
* Same PLMN : From p-SEPP to NF via SCP
*/
OpenAPI_uri_scheme_e scheme = OpenAPI_uri_scheme_NULL;
char *fqdn = NULL;
uint16_t fqdn_port = 0;
ogs_sockaddr_t *addr = NULL, *addr6 = NULL;
if (server->interface == NULL) {
if (ogs_sbi_server_first_by_interface(
OGS_SBI_INTERFACE_NAME_SEPP) ||
ogs_sbi_server_first_by_interface(
OGS_SBI_INTERFACE_NAME_N32F)) {
ogs_error("[DROP] Peer SEPP is using "
"the wrong interface[%s]", server->interface);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
} else {
if (strcmp(server->interface,
OGS_SBI_INTERFACE_NAME_SEPP) == 0) {
if (ogs_sbi_server_first_by_interface(
OGS_SBI_INTERFACE_NAME_N32F)) {
ogs_error("[DROP] Peer SEPP is using "
"the wrong interface[%s]", server->interface);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
}
}
/* Find or Add Client Instance */
rc = ogs_sbi_getaddr_from_uri(
&scheme, &fqdn, &fqdn_port, &addr, &addr6,
headers.target_apiroot);
if (rc == false || scheme == OpenAPI_uri_scheme_NULL) {
ogs_error("Invalid Target-apiRoot [%s]",
headers.target_apiroot);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
client = ogs_sbi_client_find(
scheme, fqdn, fqdn_port, addr, addr6);
if (!client) {
client = ogs_sbi_client_add(
scheme, fqdn, fqdn_port, addr, addr6);
ogs_assert(client);
}
OGS_SBI_SETUP_CLIENT(assoc, client);
ogs_free(fqdn);
ogs_freeaddrinfo(addr);
ogs_freeaddrinfo(addr6);
/* Get SCP client */
scp_client = NF_INSTANCE_CLIENT(ogs_sbi_self()->scp_instance);
/* Client ApiRoot */
if (scp_client) {
apiroot = ogs_sbi_client_apiroot(scp_client);
ogs_assert(apiroot);
/* Switch to the SCP's client */
client = scp_client;
} else {
apiroot = ogs_sbi_client_apiroot(client);
ogs_assert(apiroot);
/* Remove Target-apiRoot */
do_not_remove_custom_header = false;
}
}
/* Setup New URI */
newuri = ogs_msprintf("%s%s", apiroot, request->h.uri);
ogs_assert(newuri);
ogs_free(apiroot);
/* Copy Request for SEPP request */
copy_request(&sepp_request, request, do_not_remove_custom_header);
ogs_assert(sepp_request.http.headers);
/* Set New URI to SEPP request */
sepp_request.h.uri = newuri;
ogs_assert(sepp_request.h.uri);
/* Send the HTTP Request with New URI and HTTP Headers */
if (scp_client) {
rc = ogs_sbi_client_send_via_scp_or_sepp(
scp_client, response_handler, &sepp_request, assoc);
ogs_expect(rc == true);
} else {
rc = ogs_sbi_client_send_request(
client, response_handler, &sepp_request, assoc);
ogs_expect(rc == true);
}
if (rc == false) {
ogs_error("ogs_sbi_send_request_to_client() failed");
ogs_sbi_http_hash_free(sepp_request.http.headers);
ogs_free(sepp_request.h.uri);
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
ogs_sbi_http_hash_free(sepp_request.http.headers);
ogs_free(sepp_request.h.uri);
return OGS_OK;
}
/***************************************
* Receive NOTIFICATION message from NRF
***************************************/
ogs_assert(request);
ogs_assert(data);
if (server->interface &&
strcmp(server->interface, OGS_SBI_INTERFACE_NAME_N32F) == 0) {
ogs_error("[DROP] Peer SEPP is using the wrong interface[%s]",
server->interface);
return OGS_ERROR;
}
e = sepp_event_new(OGS_EVENT_SBI_SERVER);
ogs_assert(e);
e->h.sbi.request = request;
e->h.sbi.data = data;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ogs_queue_push() failed:%d", (int)rv);
ogs_event_free(e);
return OGS_ERROR;
}
return OGS_OK;
}
static int response_handler(
int status, ogs_sbi_response_t *response, void *data)
{
sepp_assoc_t *assoc = data;
ogs_sbi_stream_t *stream = NULL;
ogs_assert(assoc);
stream = assoc->stream;
ogs_assert(stream);
if (status != OGS_OK) {
ogs_log_message(
status == OGS_DONE ? OGS_LOG_DEBUG : OGS_LOG_WARN, 0,
"response_handler() failed [%d]", status);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR, NULL,
"response_handler() failed", NULL));
sepp_assoc_remove(assoc);
return OGS_ERROR;
}
ogs_assert(response);
ogs_expect(true == ogs_sbi_server_send_response(stream, response));
sepp_assoc_remove(assoc);
return OGS_OK;
}
static void copy_request(
ogs_sbi_request_t *target, ogs_sbi_request_t *source,
bool do_not_remove_custom_header)
{
ogs_hash_index_t *hi;
ogs_assert(source);
ogs_assert(target);
memset(target, 0, sizeof(*target));
/* HTTP method/params/content */
target->h.method = source->h.method;
target->http.params = source->http.params;
target->http.content = source->http.content;
target->http.content_length = source->http.content_length;
/* HTTP Headers
*
* To remove the followings,
* Scheme - https
* Authority - sepp.open5gs.org
*/
target->http.headers = ogs_hash_make();
ogs_assert(target->http.headers);
/* Extract HTTP Header */
for (hi = ogs_hash_first(source->http.headers);
hi; hi = ogs_hash_next(hi)) {
char *key = (char *)ogs_hash_this_key(hi);
char *val = ogs_hash_this_val(hi);
if (!key || !val) {
ogs_error("No Key[%s] Value[%s]", key, val);
continue;
}
/*
* <RFC 2616>
* Each header field consists of a name followed by a colon (":")
* and the field value. Field names are case-insensitive.
*/
if (do_not_remove_custom_header == false &&
!strcasecmp(key, OGS_SBI_CUSTOM_TARGET_APIROOT)) {
} else if (do_not_remove_custom_header == false &&
!strncasecmp(key, OGS_SBI_CUSTOM_DISCOVERY_COMMON,
strlen(OGS_SBI_CUSTOM_DISCOVERY_COMMON))) {
} else if (!strcasecmp(key, OGS_SBI_SCHEME)) {
} else if (!strcasecmp(key, OGS_SBI_AUTHORITY)) {
} else {
ogs_sbi_header_set(target->http.headers, key, val);
}
}
}
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