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Merge pull request #1195 from DarkMatterMatt/feat/gallagher-simulate

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Support specifying region/facility/card/issue numbers to Gallagher simulation
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Iceman 2021-02-11 22:43:30 +01:00 • committed by GitHub
commit 9ae5b8aa83
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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; 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) { 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--) { for (int i = data_len - 1; i >= 0; i--) {
uint8_t blk = *pos / 32; 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"); PrintAndLogEx(FAILED, "Can't specify both raw and rc/fc/cn/il at the same time");
return PM3_EINVARG; return PM3_EINVARG;
} }
// if one is set, all must be set if (!isValidGallagherParams(region_code, facility_code, card_number, issue_level)) {
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)");
return PM3_EINVARG; return PM3_EINVARG;
} }
} }
@ -356,21 +365,65 @@ static int CmdGallagherSim(const char *Cmd) {
CLIParserInit(&ctx, "lf gallagher sim", CLIParserInit(&ctx, "lf gallagher sim",
"Enables simulation of GALLAGHER card with specified card number.\n" "Enables simulation of GALLAGHER card with specified card number.\n"
"Simulation runs until the button is pressed or another USB command is issued.\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[] = { void *argtable[] = {
arg_param_begin, 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 arg_param_end
}; };
CLIExecWithReturn(ctx, Cmd, argtable, false); CLIExecWithReturn(ctx, Cmd, argtable, false);
int raw_len = 0; int raw_len = 0;
// skip first block, 3*4 = 12 bytes left // skip first block, 3*4 = 12 bytes left
uint8_t raw[12] = {0}; uint8_t raw[12] = {0};
CLIGetHexWithReturn(ctx, 1, raw, &raw_len); 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); 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. // ASK/MAN sim.
PrintAndLogEx(SUCCESS, "Simulating Gallagher - raw " _YELLOW_("%s"), sprint_hex_inrow(raw, sizeof(raw))); PrintAndLogEx(SUCCESS, "Simulating Gallagher - raw " _YELLOW_("%s"), sprint_hex_inrow(raw, sizeof(raw)));