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Add support for specifying region/facility/card/issue numbers to Gallagher simulation

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Extract `region_code`/`facility_code`/`card_number`/`issue_level` validation to `isValidGallagherParams` function
Add `--rc/fc/cn/il` parameters to `lf gallagher sim`
This commit is contained in:
DarkMatterMatt 2021-02-12 10:23:05 +13:00
parent d8e39b19b3
commit d7a1145945
1 changed files with 75 additions and 22 deletions
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97
client/src/cmdlfgallagher.c
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@ -187,6 +187,34 @@ static int CmdGallagherReader(const char *Cmd) {
return PM3_SUCCESS;
}
static bool isValidGallagherParams(int8_t rc, int32_t fc, int32_t cn, int8_t il) {
bool isValid = true;
// if one is set, all must be set
if (rc < 0 || fc < 0 || cn < 0 || il < 0) {
PrintAndLogEx(FAILED, "If rc/fc/cn/il is specified, all must be set");
isValid = false;
}
// validate input
if (rc > 0x0f) {
PrintAndLogEx(FAILED, "Region code must be less than 16 (4 bits)");
isValid = false;
}
if (fc > 0xffff) {
PrintAndLogEx(FAILED, "Facility code must be less than 65536 (2 bytes)");
isValid = false;
}
if (cn > 0xffffff) {
PrintAndLogEx(FAILED, "Card number must be less than 16777216 (3 bytes)");
isValid = false;
}
if (il > 0x0f) {
PrintAndLogEx(FAILED, "Issue level must be less than 16 (4 bits)");
isValid = false;
}
return isValid;
}
static void setBitsInBlocks(uint32_t *blocks, uint8_t *pos, uint32_t data, uint8_t data_len) {
for (int i = data_len - 1; i >= 0; i--) {
uint8_t blk = *pos / 32;
@ -286,26 +314,7 @@ static int CmdGallagherClone(const char *Cmd) {
PrintAndLogEx(FAILED, "Can't specify both raw and rc/fc/cn/il at the same time");
return PM3_EINVARG;
}
// if one is set, all must be set
if (region_code == -1 || facility_code == -1 || card_number == -1 || issue_level == -1) {
PrintAndLogEx(FAILED, "If rc/fc/cn/il is specified, all must be set");
return PM3_EINVARG;
}
// validate input
if (region_code > 0x0f) {
PrintAndLogEx(FAILED, "Region code must be less than 16 (4 bits)");
return PM3_EINVARG;
}
if (facility_code > 0xffff) {
PrintAndLogEx(FAILED, "Facility code must be less than 65536 (2 bytes)");
return PM3_EINVARG;
}
if (card_number > 0xffffff) {
PrintAndLogEx(FAILED, "Card number must be less than 16777216 (3 bytes)");
return PM3_EINVARG;
}
if (issue_level > 0x0f) {
PrintAndLogEx(FAILED, "Issue level must be less than 16 (4 bits)");
if (!isValidGallagherParams(region_code, facility_code, card_number, issue_level)) {
return PM3_EINVARG;
}
}
@ -356,21 +365,65 @@ static int CmdGallagherSim(const char *Cmd) {
CLIParserInit(&ctx, "lf gallagher sim",
"Enables simulation of GALLAGHER card with specified card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.\n",
"lf gallagher sim --raw 0FFD5461A9DA1346B2D1AC32"
"lf gallagher sim --raw 0FFD5461A9DA1346B2D1AC32\n"
"lf gallagher sim --rc 0 --fc 9876 --cn 1234 --il 1"
);
void *argtable[] = {
arg_param_begin,
arg_str1("r", "raw", "<hex>", "raw hex data. 12 bytes max"),
arg_str0("r", "raw", "<hex>", "raw hex data. 12 bytes max"),
arg_int0(NULL, "rc", "<decimal>", "Region code. 4 bits max"),
arg_int0(NULL, "fc", "<decimal>", "Facility code. 2 bytes max"),
arg_int0(NULL, "cn", "<decimal>", "Card number. 3 bytes max"),
arg_int0(NULL, "il", "<decimal>", "Issue level. 4 bits max"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, false);
int raw_len = 0;
// skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0};
CLIGetHexWithReturn(ctx, 1, raw, &raw_len);
CLIParamHexToBuf(arg_get_str(ctx, 1), raw, sizeof raw, &raw_len);
int16_t region_code = arg_get_int_def(ctx, 2, -1);
int32_t facility_code = arg_get_int_def(ctx, 3, -1);
uint64_t card_number = arg_get_int_def(ctx, 4, -1);
uint32_t issue_level = arg_get_int_def(ctx, 5, -1);
CLIParserFree(ctx);
bool use_raw = raw_len > 0;
if (region_code == -1 && facility_code == -1 && card_number == -1 && issue_level == -1) {
if (!use_raw) {
PrintAndLogEx(FAILED, "Must specify either raw data to clone, or rc/fc/cn/il");
return PM3_EINVARG;
}
} else {
// --raw and --rc/fc/cn/il are mutually exclusive
if (use_raw) {
PrintAndLogEx(FAILED, "Can't specify both raw and rc/fc/cn/il at the same time");
return PM3_EINVARG;
}
if (!isValidGallagherParams(region_code, facility_code, card_number, issue_level)) {
return PM3_EINVARG;
}
}
if (!use_raw) {
// generate Gallagher data
uint32_t blocks[3];
createBlocks(blocks, region_code, facility_code, card_number, issue_level);
// convert to the normal 'raw' format
for (int i = 0; i < ARRAYLEN(blocks); i++) {
raw[(4 * i) + 0] = (blocks[i] >> 24) & 0xff;
raw[(4 * i) + 1] = (blocks[i] >> 16) & 0xff;
raw[(4 * i) + 2] = (blocks[i] >> 8) & 0xff;
raw[(4 * i) + 3] = (blocks[i]) & 0xff;
}
}
// ASK/MAN sim.
PrintAndLogEx(SUCCESS, "Simulating Gallagher - raw " _YELLOW_("%s"), sprint_hex_inrow(raw, sizeof(raw)));