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Add hf gallagher reader command

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Matt Moran 2022-01-01 22:22:57 +13:00
parent 491c93e715
commit 13ff8d50cf
2 changed files with 186 additions and 10 deletions
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192
client/src/cmdhfgallagher.c
View file

@ -11,39 +11,213 @@
*/
#include "cmdhfgallagher.h"
#include "mifare.h"
#include "mifare/desfirecore.h"
#include "mifare/gallaghercore.h"
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "commonutil.h"
#include "cmdparser.h"
#include "cliparser.h"
#include "ui.h"
static void reverseAid(uint8_t *aid) {
uint8_t tmp = aid[0];
aid[0] = aid[2];
aid[2] = tmp;
};
static int CmdHelp(const char *Cmd);
static int readCardApplicationDirectory(DesfireContext_t *ctx, uint8_t *destBuf, uint8_t destBufLen, uint8_t *numEntries, bool verbose) {
if (destBufLen != 3 * 36) {
PrintAndLogEx(ERR, "readCardApplicationDirectory destination buffer is incorrectly sized. "
"Received length %d, expected %d", destBufLen, 3 * 36);
return PM3_EINVARG;
}
DesfireSetCommMode(ctx, DCMPlain);
// Get card AIDs from Card Application Directory (which contains 1 to 3 files)
uint8_t cadAid[] = { 0xF4, 0x81, 0x2F };
int res = DesfireSelectAID(ctx, cadAid, NULL);
HF_GALLAGHER_RETURN_IF_ERROR(res);
// Read up to 3 files with 6x 6-byte entries each
for (uint8_t i = 0; i < 3; i++) {
size_t readLen;
DesfireReadFile(ctx, i, 0, 36, &destBuf[i * 36], &readLen);
}
// Keep only valid entries
*numEntries = 0;
for (uint8_t i = 0; i < destBufLen; i += 6) {
if (memcmp(&destBuf[i], "\0\0\0\0\0\0", 6) == 0) break;
*numEntries += 1;
}
if (verbose) {
// Print what we found
PrintAndLogEx(SUCCESS, "Card Application Directory contains:" NOLF);
for (int i = 0; i < *numEntries; i++)
PrintAndLogEx(NORMAL, "%s %06x" NOLF, (i == 0) ? "" : ",", DesfireAIDByteToUint(&destBuf[i*6 + 3]));
PrintAndLogEx(NORMAL, "");
}
return PM3_SUCCESS;
}
static int readCardApplicationCredentials(DesfireContext_t *ctx, uint8_t *aid, uint8_t *sitekey, GallagherCredentials_t *creds, bool verbose) {
// Check that card UID has been set
if (ctx->uidlen == 0) {
PrintAndLogEx(ERR, "Card UID must be set in DesfireContext (required for key diversification)");
return PM3_EINVARG;
}
// Set up context
DesfireSetKeyNoClear(ctx, 2, T_AES, sitekey);
DesfireSetKdf(ctx, MFDES_KDF_ALGO_GALLAGHER, NULL, 0);
DesfireSetCommMode(ctx, DCMPlain);
DesfireSetCommandSet(ctx, DCCNativeISO);
// Select and authenticate to AID
int res = DesfireSelectAndAuthenticateAppW(ctx, DACEV1, ISW6bAID, le24toh(aid), false, verbose);
HF_GALLAGHER_RETURN_IF_ERROR(res);
// Read file 0 (contains credentials)
uint8_t buf[16] = { 0x00 };
size_t readLen = 0;
DesfireSetCommMode(ctx, DCMEncrypted);
res = DesfireReadFile(ctx, 0, 0, 16, buf, &readLen);
HF_GALLAGHER_RETURN_IF_ERROR(res);
// Check file contained 16 bytes of data
if (readLen != 16) {
PrintAndLogEx(ERR, "Failed reading file 0 in %06x", DesfireAIDByteToUint(aid));
return PM3_EFAILED;
}
// Check second half of file is the bitwise inverse of the first half
for (uint8_t i = 8; i < 16; i++)
buf[i] ^= 0xFF;
if (memcmp(buf, &buf[8], 8) != 0) {
PrintAndLogEx(ERR, "Invalid cardholder data in file 0. Received %s", sprint_hex_inrow(buf, 16));
return PM3_EFAILED;
}
decodeCardholderCredentials(buf, creds);
// TODO: read MIFARE Enhanced Security file
// https://github.com/megabug/gallagher-research/blob/master/formats/mes.md
return PM3_SUCCESS;
}
static int readCard(uint8_t *aid, uint8_t *sitekey, bool verbose, bool continuousMode) {
DropField();
clearCommandBuffer();
// Set up context
DesfireContext_t dctx = {0};
DesfireClearContext(&dctx);
// Get card UID (for key diversification)
int res = DesfireGetCardUID(&dctx);
HF_GALLAGHER_FAIL_IF_ERROR(res, verbose || !continuousMode, "Failed retrieving card UID.");
// Find AIDs to process (from CLI args or the Card Application Directory)
uint8_t cad[36 * 3] = {0};
uint8_t numEntries = 0;
if (aid != NULL) {
memcpy(&cad[3], aid, 3);
reverseAid(&cad[3]); // CAD stores AIDs backwards
numEntries = 1;
} else {
res = readCardApplicationDirectory(&dctx, cad, ARRAYLEN(cad), &numEntries, verbose);
HF_GALLAGHER_FAIL_IF_ERROR(res, verbose || !continuousMode, "Failed reading card application directory.");
}
// Loop through each application in the CAD
for (uint8_t i = 0; i < numEntries * 6; i += 6) {
uint16_t region_code = cad[i + 0];
uint16_t facility_code = (cad[i + 1] << 8) + cad[i + 2];
// Copy AID out of CAD record
uint8_t currentAid[3];
memcpy(currentAid, &cad[3], 3);
reverseAid(currentAid); // CAD stores AIDs backwards
if (verbose) {
if (region_code > 0 || facility_code > 0)
PrintAndLogEx(INFO, "Reading AID: %06x, region: %u, facility: %u", DesfireAIDByteToUint(currentAid), region_code, facility_code);
else
PrintAndLogEx(INFO, "Reading AID: %06x", DesfireAIDByteToUint(currentAid));
}
// Read & decode credentials
GallagherCredentials_t creds = {0};
res = readCardApplicationCredentials(&dctx, currentAid, sitekey, &creds, verbose);
HF_GALLAGHER_FAIL_IF_ERROR(res, verbose || !continuousMode, "Failed reading card application credentials.");
PrintAndLogEx(SUCCESS, "GALLAGHER - Region: " _GREEN_("%u") ", Facility: " _GREEN_("%u") ", Card No.: " _GREEN_("%u") ", Issue Level: " _GREEN_("%u"),
creds.region_code, creds.facility_code, creds.card_number, creds.issue_level);
}
return PM3_SUCCESS;
}
static int CmdGallagherReader(const char *Cmd) {
CLIParserContext *ctx;
CLIParserInit(&ctx, "hf gallagher reader",
"read a GALLAGHER tag",
"hf gallagher reader -@ -> continuous reader mode"
"hf gallagher reader --aid 2081f4 --sitekey 00112233445566778899aabbccddeeff"
" -> act as a reader that doesn't skips the Card Application Directory and uses a non-default site key\n"
"hf gallagher reader -@ -> continuous reader mode"
);
void *argtable[] = {
arg_param_begin,
arg_lit0("@", NULL, "optional - continuous reader mode"),
arg_str0(NULL, "aid", "<hex>", "Application ID to read (3 bytes)"),
arg_str1("k", "sitekey", "<hex>", "Master site key to compute diversified keys (16 bytes)"),
arg_lit0(NULL, "apdu", "show APDU requests and responses"),
arg_lit0("v", "verbose", "Verbose mode"),
arg_lit0("@", "continuous", "Continuous reader mode"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);
bool cm = arg_get_lit(ctx, 1);
CLIParserFree(ctx);
if (cm) {
PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
int aidLen = 0;
uint8_t aid[3] = {0};
CLIGetHexWithReturn(ctx, 1, aid, &aidLen);
if (aidLen > 0 && aidLen != 3) {
PrintAndLogEx(ERR, "--aid must be 3 bytes");
return PM3_EINVARG;
}
reverseAid(aid); // PM3 displays AIDs backwards
int sitekeyLen = 0;
uint8_t sitekey[16] = {0};
CLIGetHexWithReturn(ctx, 2, sitekey, &sitekeyLen);
if (sitekeyLen > 0 && sitekeyLen != 16) {
PrintAndLogEx(ERR, "--sitekey must be 16 bytes");
return PM3_EINVARG;
}
SetAPDULogging(arg_get_lit(ctx, 3));
bool verbose = arg_get_lit(ctx, 4);
bool continuousMode = arg_get_lit(ctx, 5);
CLIParserFree(ctx);
if (continuousMode)
PrintAndLogEx(INFO, "Press " _GREEN_("<Enter>") " to exit");
int res;
do {
// read
} while (cm && !kbd_enter_pressed());
return PM3_SUCCESS;
res = readCard(aidLen > 0 ? aid : NULL, sitekey, verbose, continuousMode);
} while (continuousMode && !kbd_enter_pressed());
return continuousMode ? PM3_SUCCESS : res;
}
static int CmdGallagherClone(const char *Cmd) {

4
client/src/cmdhfgallagher.h
View file

@ -16,5 +16,7 @@
int CmdHFGallagher(const char *Cmd);
#endif
#define HF_GALLAGHER_RETURN_IF_ERROR(res) if (res != PM3_SUCCESS) { return res; }
#define HF_GALLAGHER_FAIL_IF_ERROR(res, verbose, reason) if (res != PM3_SUCCESS) { if (verbose) PrintAndLogEx(ERR, reason " Error code %d", res); DropField(); return res; }
#endif