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/* Copyright (C) 2011 NORDUnet A/S
* See LICENSE for information about licensing.
*/
#include <stdio.h> /* For sprintf(). */
#include <string.h>
#include <nettle/sha.h>
#include <nettle/hmac.h>
#include <regex.h>
#include <pthread.h>
#include <sys/time.h>
#include "radsecproxy.h"
#include "debug.h"
#include "fticks.h"
static void
_format_hash(const uint8_t *hash, size_t out_len, uint8_t *out)
{
int ir, iw;
for (ir = 0, iw = 0; iw <= out_len - 3; ir++, iw += 2)
sprintf((char *) out + iw, "%02x", hash[ir % SHA256_DIGEST_SIZE]);
}
static void
_hash(const uint8_t *in,
const uint8_t *key,
size_t out_len,
uint8_t *out)
{
if (key == NULL) {
struct sha256_ctx ctx;
uint8_t hash[SHA256_DIGEST_SIZE];
sha256_init(&ctx);
sha256_update(&ctx, strlen((char *) in), in);
sha256_digest(&ctx, sizeof(hash), hash);
_format_hash(hash, out_len, out);
}
else {
struct hmac_sha256_ctx ctx;
uint8_t hash[SHA256_DIGEST_SIZE];
hmac_sha256_set_key(&ctx, strlen((char *) key), key);
hmac_sha256_update(&ctx, strlen((char *) in), in);
hmac_sha256_digest(&ctx, sizeof(hash), hash);
_format_hash(hash, out_len, out);
}
}
int
fticks_configure(struct options *options,
uint8_t **reportingp,
uint8_t **macp,
uint8_t **keyp)
{
int r = 0;
const char *reporting = (const char *) *reportingp;
const char *mac = (const char *) *macp;
if (reporting == NULL)
goto out;
if (strcasecmp(reporting, "None") == 0)
options->fticks_reporting = RSP_FTICKS_REPORTING_NONE;
else if (strcasecmp(reporting, "Basic") == 0)
options->fticks_reporting = RSP_FTICKS_REPORTING_BASIC;
else if (strcasecmp(reporting, "Full") == 0)
options->fticks_reporting = RSP_FTICKS_REPORTING_FULL;
else {
debugx(1, DBG_ERR, "config error: invalid FTicksReporting value: %s",
reporting);
r = 1;
goto out;
}
if (strcasecmp(mac, "Static") == 0)
options->fticks_mac = RSP_FTICKS_MAC_STATIC;
else if (strcasecmp(mac, "Original") == 0)
options->fticks_mac = RSP_FTICKS_MAC_ORIGINAL;
else if (strcasecmp(mac, "VendorHashed") == 0)
options->fticks_mac = RSP_FTICKS_MAC_VENDOR_HASHED;
else if (strcasecmp(mac, "VendorKeyHashed") == 0)
options->fticks_mac = RSP_FTICKS_MAC_VENDOR_KEY_HASHED;
else if (strcasecmp(mac, "FullyHashed") == 0)
options->fticks_mac = RSP_FTICKS_MAC_FULLY_HASHED;
else if (strcasecmp(mac, "FullyKeyHashed") == 0)
options->fticks_mac = RSP_FTICKS_MAC_FULLY_KEY_HASHED;
else {
debugx(1, DBG_ERR, "config error: invalid FTicksMAC value: %s", mac);
r = 1;
goto out;
}
if (*keyp == NULL
&& (options->fticks_mac == RSP_FTICKS_MAC_VENDOR_KEY_HASHED
|| options->fticks_mac == RSP_FTICKS_MAC_FULLY_KEY_HASHED)) {
debugx(1, DBG_ERR,
"config error: FTicksMAC %s requires an FTicksKey", mac);
options->fticks_mac = RSP_FTICKS_MAC_STATIC;
r = 1;
goto out;
}
if (*keyp != NULL)
options->fticks_key = *keyp;
out:
if (*reportingp != NULL) {
free(*reportingp);
*reportingp = NULL;
}
if (*macp != NULL) {
free(*macp);
*macp = NULL;
}
return r;
}
/** Hash the Ethernet MAC address in \a IN, keying a HMAC with \a KEY
unless \a KEY is NULL. If \a KEY is null \a IN is hashed with an
ordinary cryptographic hash function such as SHA-2.
\a IN and \a KEY are NULL terminated strings.
\a IN is supposed to be an Ethernet MAC address and is sanitised
by lowercasing it, removing all but [0-9a-f] and truncating it at
the first ';' found. The truncation is done because RADIUS
supposedly has a praxis of tacking on SSID to the MAC address in
Calling-Station-Id. */
void
fticks_hashmac(const uint8_t *in,
const uint8_t *key,
size_t out_len,
uint8_t *out)
{
/* TODO: lowercase */
/* TODO: s/[!0-9a-f]//1 */
/* TODO: truncate after first ';', if any */
_hash(in, key, out_len, out);
}
void
fticks_log(const struct options *options,
const struct client *client,
const struct radmsg *msg,
const struct rqout *rqout)
{
uint8_t *username = NULL;
uint8_t *realm = NULL;
uint8_t visinst[8+40+1+1]; /* Room for 40 octets of VISINST. */
uint8_t *macin = NULL;
uint8_t macout[2*32+1]; /* Room for ASCII representation of SHA256. */
username = radattr2ascii(radmsg_gettype(rqout->rq->msg,
RAD_Attr_User_Name));
if (username != NULL) {
realm = (uint8_t *) strrchr((char *) username, '@');
if (realm != NULL)
realm++;
}
if (realm == NULL)
realm = (uint8_t *) "";
memset(visinst, 0, sizeof(visinst));
if (options->fticks_reporting == RSP_FTICKS_REPORTING_FULL) {
snprintf((char *) visinst, sizeof(visinst), "VISINST=%s#",
client->conf->name);
}
memset(macout, 0, sizeof(macout));
if (options->fticks_mac == RSP_FTICKS_MAC_STATIC) {
strncpy((char *) macout, "undisclosed", sizeof(macout) - 1);
}
else {
macin = radattr2ascii(radmsg_gettype(rqout->rq->msg,
RAD_Attr_Calling_Station_Id));
if (macin) {
switch (options->fticks_mac)
{
case RSP_FTICKS_MAC_ORIGINAL:
memcpy(macout, macin, sizeof(macout));
break;
case RSP_FTICKS_MAC_VENDOR_HASHED:
memcpy(macout, macin, 9);
fticks_hashmac(macin, NULL, sizeof(macout) - 9, macout + 9);
break;
case RSP_FTICKS_MAC_VENDOR_KEY_HASHED:
memcpy(macout, macin, 9);
/* We are hashing the first nine octets too for easier
* correlation between vendor-key-hashed and
* fully-key-hashed log records. This opens up for a
* known plaintext attack on the key but the
* consequences of that is considered outweighed by
* the convenience gained. */
fticks_hashmac(macin, options->fticks_key,
sizeof(macout) - 9, macout + 9);
break;
case RSP_FTICKS_MAC_FULLY_HASHED:
fticks_hashmac(macin, NULL, sizeof(macout), macout);
break;
case RSP_FTICKS_MAC_FULLY_KEY_HASHED:
fticks_hashmac(macin, options->fticks_key, sizeof(macout),
macout);
break;
default:
debugx(2, DBG_ERR, "invalid fticks mac configuration: %d",
options->fticks_mac);
}
}
}
debug(0xff,
"F-TICKS/eduroam/1.0#REALM=%s#VISCOUNTRY=%s#%sCSI=%s#RESULT=%s#",
realm,
client->conf->fticks_viscountry,
visinst,
macout,
msg->code == RAD_Access_Accept ? "OK" : "FAIL");
if (macin != NULL)
free(macin);
if (username != NULL)
free(username);
}
/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */
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