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RSU tolling client repay protection

This commit is contained in:
emanuel 2022-08-19 15:32:27 +01:00
parent 174c20aaea
commit f16d636ae0
2 changed files with 61 additions and 3 deletions
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53
src/tpm.c
View File

@ -687,6 +687,50 @@ static void rsu_handle_recv(facilities_t* facilities, TPM_t* tpm_rx, void* secur
tpm->tpm->referencePosition.positionConfidenceEllipse.semiMajorOrientation = 900;
}
// Client management
for (int i = 0 ; i < tolling->station.rsu.clients_len; ++i) {
if (itss_time_get() > tolling->station.rsu.clients[i]->ts + TOLLING_CLIENT_LIFETIME_MS) {
free(tolling->station.rsu.clients[i]);
tolling->station.rsu.clients[i] = NULL;
for (int j = i; j < tolling->station.rsu.clients_len-1; ++j) {
tolling->station.rsu.clients[j] = tolling->station.rsu.clients[j+1];
}
--tolling->station.rsu.clients_len;
}
}
// Find client
toll_client_t* client = NULL;
for (int i = 0; i < tolling->station.rsu.clients_len; ++i) {
if (tolling->station.rsu.clients[i]->id == client_id) {
client = tolling->station.rsu.clients[i];
}
}
// Create client
if (!client) {
if (tolling->station.rsu.clients_len-1 >= TOLLING_MAX_CLIENTS) {
syslog_err("[facilities] [tolling] max clients reached");
goto cleanup;
}
tolling->station.rsu.clients[tolling->station.rsu.clients_len] = malloc(sizeof(toll_client_t));
client = tolling->station.rsu.clients[tolling->station.rsu.clients_len];
client->id = client_id;
client->station_id = tpm_rx->header.stationID;
client->ts = itss_time_get();
client->accepted = -1;
}
uint8_t confirmation_code = TollingConfirmationCode_rejected;
if (itss_time_get() > client->ts + TOLLING_PAYMENT_MIN_PERIOD_MS ||
client->accepted == -1) {
confirmation_code = TollingConfirmationCode_accepted;
client->accepted = true;
} else if (client->accepted &&
itss_time_get() < client->ts + TOLLING_PAYMENT_MIN_PERIOD_MS) {
confirmation_code = TollingConfirmationCode_alreadyAccepted;
}
tpm->tpm->tollingType = calloc(1, sizeof(TollingType_t));
switch (tpm_rx->tpm->tollingType->present) {
case TollingType_PR_entry:
@ -695,7 +739,7 @@ static void rsu_handle_recv(facilities_t* facilities, TPM_t* tpm_rx, void* secur
tpm->tpm->tollingType->choice.entry.choice.reply.clientId = client_id;
tpm->tpm->tollingType->choice.entry.choice.reply.infoId = info_id;
tpm->tpm->tollingType->choice.entry.choice.reply.transactionNonce = nonce;
tpm->tpm->tollingType->choice.entry.choice.reply.confirmationCode = TollingConfirmationCode_accepted;
tpm->tpm->tollingType->choice.entry.choice.reply.confirmationCode = confirmation_code;
break;
case TollingType_PR_exit:
tpm->tpm->tollingType->present = TollingType_PR_exit;
@ -704,7 +748,7 @@ static void rsu_handle_recv(facilities_t* facilities, TPM_t* tpm_rx, void* secur
tpm->tpm->tollingType->choice.exit->choice.reply.clientId = client_id;
tpm->tpm->tollingType->choice.exit->choice.reply.infoId = info_id;
tpm->tpm->tollingType->choice.exit->choice.reply.transactionNonce = nonce;
tpm->tpm->tollingType->choice.exit->choice.reply.confirmationCode = TollingConfirmationCode_accepted;
tpm->tpm->tollingType->choice.exit->choice.reply.confirmationCode = confirmation_code;
break;
case TollingType_PR_single:
tpm->tpm->tollingType->present = TollingType_PR_single;
@ -712,7 +756,7 @@ static void rsu_handle_recv(facilities_t* facilities, TPM_t* tpm_rx, void* secur
tpm->tpm->tollingType->choice.single.choice.reply.clientId = client_id;
tpm->tpm->tollingType->choice.single.choice.reply.infoId = info_id;
tpm->tpm->tollingType->choice.single.choice.reply.transactionNonce = nonce;
tpm->tpm->tollingType->choice.single.choice.reply.confirmationCode = TollingConfirmationCode_accepted;
tpm->tpm->tollingType->choice.single.choice.reply.confirmationCode = confirmation_code;
break;
default:
break;
@ -1290,6 +1334,9 @@ int tolling_init(tolling_t* tolling, void* zmq_ctx, char* security_address, uint
switch (station_type) {
case 15:
for (int i = 0; i < TOLLING_MAX_CLIENTS; ++i) {
tolling->station.rsu.clients[i] = NULL;
}
break;
default:
tolling->station.obu.toll_type = -1;

11
src/tpm.h
View File

@ -12,6 +12,8 @@
#define TOLLING_CONN_TIMEOUT_MS 10000
#define TOLLING_RT_PERIOD_MS 400
#define TOLLING_RT_TIMEOUT_MS 10000
#define TOLLING_MAX_CLIENTS 256
#define TOLLING_CLIENT_LIFETIME_MS 300000
typedef enum TOLLING_PROTOCOL {
TOLLING_PROTOCOL_SIMPLE,
@ -41,6 +43,13 @@ typedef struct tlsc {
uint16_t nmsg;
} tlsc_t;
typedef struct toll_client {
uint64_t station_id;
uint64_t id;
uint64_t ts;
int8_t accepted;
} toll_client_t;
typedef struct tolling {
bool enabled;
pthread_mutex_t lock;
@ -63,6 +72,8 @@ typedef struct tolling {
union {
// RSU
struct {
toll_client_t* clients[TOLLING_MAX_CLIENTS];
uint16_t clients_len;
} rsu;
// OBU