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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <openssl/md5.h>
#include "triton.h"
#include "log.h"
#include "radius.h"
#define PD_COA_PORT 3799
struct dm_coa_serv_t
{
struct triton_context_t ctx;
struct triton_md_handler_t hnd;
};
static int dm_coa_check_RA(struct rad_packet_t *pack, const char *secret)
{
uint8_t RA[16];
MD5_CTX ctx;
memset(RA, 0, 16);
MD5_Init(&ctx);
MD5_Update(&ctx, pack->buf, 4);
MD5_Update(&ctx, RA, 16);
MD5_Update(&ctx, pack->buf + 20, pack->len - 20);
MD5_Update(&ctx, secret, strlen(secret));
MD5_Final(RA, &ctx);
return memcmp(RA, pack->buf + 4, 16);
}
static void dm_coa_set_RA(struct rad_packet_t *pack, const char *secret)
{
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, pack->buf, pack->len);
MD5_Update(&ctx, secret, strlen(secret));
MD5_Final(pack->buf + 4, &ctx);
}
static void disconnect_request(struct radius_pd_t *rpd)
{
rad_packet_free(rpd->dm_coa_req);
rpd->dm_coa_req = NULL;
ppp_terminate(rpd->ppp, 0);
}
static void coa_request(struct radius_pd_t *rpd)
{
rad_packet_free(rpd->dm_coa_req);
rpd->dm_coa_req = NULL;
/// TODO: CoA handling
}
static int dm_coa_read(struct triton_md_handler_t *h)
{
struct rad_packet_t *pack;
struct rad_packet_t *reply = NULL;
struct radius_pd_t *rpd;
int err_code;
uint8_t RA[16];
struct sockaddr_in addr;
pack = rad_packet_recv(h->fd, &addr);
if (!pack)
return 0;
if (pack->code != CODE_DISCONNECT_REQUEST && pack->code != CODE_COA_REQUEST) {
log_warn("radius:dm_coa: unexpected code (%i) received\n", pack->code);
goto out_err_no_reply;
}
if (dm_coa_check_RA(pack, conf_dm_coa_secret)) {
log_warn("radius:dm_coa: RA validation failed\n");
goto out_err_no_reply;
}
memcpy(RA, pack->buf + 4, sizeof(RA));
if (conf_verbose) {
log_debug("recv ");
rad_packet_print(pack, log_debug);
}
if (rad_check_nas_pack(pack)) {
log_warn("radius:dm_coa: NAS identification failed\n");
err_code = 403;
goto out_err;
}
rpd = rad_find_session_pack(pack);
if (!rpd) {
log_warn("radius:dm_coa: session not found\n");
err_code = 503;
goto out_err;
}
rpd->dm_coa_req = pack;
if (pack->code == CODE_DISCONNECT_REQUEST)
triton_context_call(rpd->ppp->ctrl->ctx, (void (*)(void *))disconnect_request, rpd);
else
triton_context_call(rpd->ppp->ctrl->ctx, (void (*)(void *))coa_request, rpd);
pthread_mutex_unlock(&rpd->lock);
reply = rad_packet_alloc(pack->code == CODE_COA_REQUEST ? CODE_COA_ACK : CODE_DISCONNECT_ACK);
reply->id = pack->id;
if (rad_packet_build(reply, RA))
goto out_err_no_reply;
dm_coa_set_RA(reply, conf_dm_coa_secret);
if (conf_verbose) {
log_debug("send ");
rad_packet_print(reply, log_debug);
}
rad_packet_send(reply, h->fd, &addr);
rad_packet_free(reply);
return 0;
out_err:
reply = rad_packet_alloc(pack->code == CODE_COA_REQUEST ? CODE_COA_NAK : CODE_DISCONNECT_NAK);
rad_packet_add_int(reply, "Error-Cause", err_code);
reply->id = pack->id;
if (rad_packet_build(reply, RA))
goto out_err_no_reply;
dm_coa_set_RA(reply, conf_dm_coa_secret);
if (conf_verbose) {
log_debug("send ");
rad_packet_print(reply, log_debug);
}
rad_packet_send(reply, h->fd, &addr);
out_err_no_reply:
rad_packet_free(pack);
if (reply)
rad_packet_free(reply);
return 0;
}
static void dm_coa_close(struct triton_context_t *ctx)
{
struct dm_coa_serv_t *serv = container_of(ctx, typeof(*serv), ctx);
triton_md_unregister_handler(&serv->hnd);
close(serv->hnd.fd);
}
static struct dm_coa_serv_t serv = {
.ctx.close = dm_coa_close,
.hnd.read = dm_coa_read,
};
static void __init init(void)
{
struct sockaddr_in addr;
serv.hnd.fd = socket (PF_INET, SOCK_DGRAM, 0);
if (serv.hnd.fd < 0) {
log_error("radius:dm_coa: socket: %s\n", strerror(errno));
return;
}
addr.sin_family = AF_INET;
addr.sin_port = htons (PD_COA_PORT);
if (conf_nas_ip_address)
addr.sin_addr.s_addr = inet_addr(conf_nas_ip_address);
else
addr.sin_addr.s_addr = htonl (INADDR_ANY);
if (bind (serv.hnd.fd, (struct sockaddr *) &addr, sizeof (addr)) < 0) {
log_error("radius:dm_coa: bind: %s\n", strerror(errno));
close(serv.hnd.fd);
return;
}
if (fcntl(serv.hnd.fd, F_SETFL, O_NONBLOCK)) {
log_error("radius:dm_coa: failed to set nonblocking mode: %s\n", strerror(errno));
close(serv.hnd.fd);
return;
}
triton_context_register(&serv.ctx);
triton_md_register_handler(&serv.ctx, &serv.hnd);
triton_md_enable_handler(&serv.hnd, MD_MODE_READ);
}
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