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EM4x05 dump: show when lock bits are unknown and show active PR word

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This commit is contained in:
Philippe Teuwen 2020-10-07 16:06:05 +02:00
parent 9395b9581f
commit ad6632beee
1 changed files with 18 additions and 8 deletions
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26
client/src/cmdlfem4x.c
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@ -951,6 +951,8 @@ static int CmdEM4x05Dump(const char *Cmd) {
int success = PM3_SUCCESS; int success = PM3_SUCCESS;
int status; int status;
uint32_t lock_bits = 0x00; // no blocks locked uint32_t lock_bits = 0x00; // no blocks locked
bool gotLockBits = false;
bool lockInPW2 = false;
uint32_t word = 0; uint32_t word = 0;
const char *info[] = {"Info/User", "UID", "Password", "User", "Config", "User", "User", "User", "User", "User", "User", "User", "User", "User", "Lock", "Lock"}; const char *info[] = {"Info/User", "UID", "Password", "User", "Config", "User", "User", "User", "User", "User", "User", "User", "User", "User", "Lock", "Lock"};
@ -971,8 +973,10 @@ static int CmdEM4x05Dump(const char *Cmd) {
if (status == PM3_SUCCESS) { if (status == PM3_SUCCESS) {
if (!usePwd) if (!usePwd)
needReadPwd = false; needReadPwd = false;
if (word != 0x00) if (word != 0x00) {
lock_bits = word; lock_bits = word;
gotLockBits = true;
}
data[14] = word; data[14] = word;
gotWord14 = true; gotWord14 = true;
} else { } else {
@ -980,22 +984,26 @@ static int CmdEM4x05Dump(const char *Cmd) {
} }
status = EM4x05ReadWord_ext(15, pwd, usePwd, &word); status = EM4x05ReadWord_ext(15, pwd, usePwd, &word);
if (status == PM3_SUCCESS) { if (status == PM3_SUCCESS) {
if (word != 0x00) // assume block 15 is the current lock block if (word != 0x00) { // assume block 15 is the current lock block
lock_bits = word; lock_bits = word;
gotLockBits = true;
lockInPW2 = true;
}
data[15] = word; data[15] = word;
gotWord15 = true; gotWord15 = true;
} else { } else {
success = PM3_ESOFT; // If any error ensure fail is set so not to save invalid data success = PM3_ESOFT; // If any error ensure fail is set so not to save invalid data
} }
uint32_t lockbit;
// Now read blocks 0 - 13 as we have 14 and 15 // Now read blocks 0 - 13 as we have 14 and 15
for (; addr < 14; addr++) { for (; addr < 14; addr++) {
lockbit = (lock_bits >> addr) & 1;
if (addr == 2) { if (addr == 2) {
if (usePwd) { if (usePwd) {
if ((needReadPwd) && (success != PM3_ESOFT)) { if ((needReadPwd) && (success != PM3_ESOFT)) {
data[addr] = BSWAP_32(pwd); data[addr] = BSWAP_32(pwd);
num_to_bytes(pwd, 4, bytes); num_to_bytes(pwd, 4, bytes);
PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %s", addr, pwd, sprint_ascii(bytes, 4), ((lock_bits >> addr) & 1) ? _RED_("x") : " ", info[addr]); PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %s", addr, pwd, sprint_ascii(bytes, 4), gotLockBits ? (lockbit ? _RED_("x") : " ") : _YELLOW_("?"), info[addr]);
} else { } else {
// The pwd is not needed for Login so we're not sure what's the actual content of that block // The pwd is not needed for Login so we're not sure what's the actual content of that block
PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]); PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]);
@ -1012,7 +1020,7 @@ static int CmdEM4x05Dump(const char *Cmd) {
data[addr] = BSWAP_32(word); data[addr] = BSWAP_32(word);
if (status == PM3_SUCCESS) { if (status == PM3_SUCCESS) {
num_to_bytes(word, 4, bytes); num_to_bytes(word, 4, bytes);
PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %s", addr, word, sprint_ascii(bytes, 4), ((lock_bits >> addr) & 1) ? _RED_("x") : " ", info[addr]); PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %s", addr, word, sprint_ascii(bytes, 4), gotLockBits ? (lockbit ? _RED_("x") : " ") : _YELLOW_("?"), info[addr]);
} else } else
PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]); PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]);
} }
@ -1021,13 +1029,15 @@ static int CmdEM4x05Dump(const char *Cmd) {
// Both lock bits are protected with bit idx 14 (special case) // Both lock bits are protected with bit idx 14 (special case)
if (gotWord14) { if (gotWord14) {
addr = 14; addr = 14;
PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %s", addr, data[addr], sprint_ascii(bytes, 4), ((lock_bits >> 14) & 1) ? _RED_("x") : " ", info[addr]); lockbit = (lock_bits >> addr) & 1;
PrintAndLogEx(NORMAL, " %02u | %08X | %s | %s | %-10s %s", addr, data[addr], sprint_ascii(bytes, 4), gotLockBits ? (lockbit ? _RED_("x") : " ") : _YELLOW_("?"), info[addr], lockInPW2 ? "" : _GREEN_("active"));
} else { } else {
PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]); PrintAndLogEx(NORMAL, " %02u | | | | %-10s " _RED_("cannot read"), addr, info[addr]);
} }
if (gotWord15) { if (gotWord15) {
addr = 15; // beware lock bit of word15 is pr14 addr = 15;
PrintAndLogEx(NORMAL, " %02d | %08X | %s | %s | %s", addr, data[addr], sprint_ascii(bytes, 4), ((lock_bits >> 14) & 1) ? _RED_("x") : " ", info[addr]); lockbit = (lock_bits >> 14) & 1; // beware lock bit of word15 is pr14
PrintAndLogEx(NORMAL, " %02d | %08X | %s | %s | %-10s %s", addr, data[addr], sprint_ascii(bytes, 4), gotLockBits ? (lockbit ? _RED_("x") : " ") : _YELLOW_("?"), info[addr], lockInPW2 ? _GREEN_("active") : "");
} else { } else {
PrintAndLogEx(NORMAL, " %02d | | | | %-10s " _RED_("cannot read"), addr, info[addr]); PrintAndLogEx(NORMAL, " %02d | | | | %-10s " _RED_("cannot read"), addr, info[addr]);
} }