mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2025-02-19 05:33:17 +08:00
FIX; coverity scan 133850, & operation should keep only topbit of lower nibble.
CHG: tabs fixed
This commit is contained in:
iceman1001
parent
a28d34f407
commit
e8fecd72bc
1 changed files with 125 additions and 118 deletions
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@ -47,24 +47,29 @@ int usage_legic_read(void){
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return 0;
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}
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int usage_legic_sim(void){
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return 0;
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}
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int usage_legic_rawwrite(void){
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return 0;
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}
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int usage_legic_fill(void){
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return 0;
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}
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/*
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* Output BigBuf and deobfuscate LEGIC RF tag data.
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* This is based on information given in the talk held
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* by Henryk Ploetz and Karsten Nohl at 26c3
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*/
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int CmdLegicDecode(const char *Cmd) {
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// Index for the bytearray.
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int i = 0;
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int k = 0, segmentNum;
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int segment_len = 0;
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int segment_flag = 0;
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int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
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int crc = 0, wrp = 0, wrc = 0;
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uint8_t stamp_len = 0;
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int crc = 0;
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int wrp = 0;
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int wrc = 0;
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uint8_t data_buf[1052]; // receiver buffer, should be 1024..
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char token_type[5];
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int dcf;
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uint8_t data_buf[1052]; // receiver buffer
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char token_type[5] = {0,0,0,0,0};
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int dcf = 0;
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int bIsSegmented = 0;
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// download EML memory, where the "legic read" command puts the data.
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@ -111,35 +116,35 @@ int CmdLegicDecode(const char *Cmd) {
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fl = 1;
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stamp_len = 0x0c - (data_buf[5] >> 4);
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} else {
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switch (data_buf[5] & 0x7f) {
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case 0x00 ... 0x2f:
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strncpy(token_type, "IAM",sizeof(token_type));
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fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
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break;
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case 0x30 ... 0x6f:
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strncpy(token_type, "SAM",sizeof(token_type));
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fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
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break;
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case 0x70 ... 0x7f:
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strncpy(token_type, "GAM",sizeof(token_type));
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fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
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break;
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}
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switch (data_buf[5] & 0x7f) {
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case 0x00 ... 0x2f:
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strncpy(token_type, "IAM", sizeof(token_type));
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fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
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break;
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case 0x30 ... 0x6f:
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strncpy(token_type, "SAM", sizeof(token_type));
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fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
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break;
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case 0x70 ... 0x7f:
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strncpy(token_type, "GAM", sizeof(token_type));
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fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
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break;
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}
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stamp_len = 0xfc - data_buf[6];
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stamp_len = 0xfc - data_buf[6];
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}
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PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
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dcf,
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data_buf[5],
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data_buf[6],
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token_type,
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(data_buf[5]&0x80)>>7,
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data_buf[5],
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data_buf[6],
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token_type,
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(data_buf[5] & 0x80 )>> 7,
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stamp_len,
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fl
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);
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);
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} else { // Is IM(-S) type of card...
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} else { // Is IM(-S) type of card...
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if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
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bIsSegmented = 1;
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@ -153,7 +158,7 @@ int CmdLegicDecode(const char *Cmd) {
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data_buf[5],
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data_buf[6],
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token_type,
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(data_buf[5]&0x80)>>7
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(data_buf[5]&0x80) >> 7
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);
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}
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@ -162,11 +167,11 @@ int CmdLegicDecode(const char *Cmd) {
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if(bIsSegmented) {
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PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
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data_buf[7]&0x0f,
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(data_buf[7]&0x70)>>4,
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(data_buf[7]&0x80)>>7,
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data_buf[8]
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);
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data_buf[7] & 0x0f,
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(data_buf[7] & 0x70) >> 4,
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(data_buf[7] & 0x80) >> 7,
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data_buf[8]
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);
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}
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// Header area is only available on IM-S cards, on master tokens this data is the master token data itself
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@ -175,129 +180,127 @@ int CmdLegicDecode(const char *Cmd) {
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PrintAndLog("Master token data");
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PrintAndLog("%s", sprint_hex(data_buf+8, 14));
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} else {
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PrintAndLog("Remaining Header Area");
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PrintAndLog("%s", sprint_hex(data_buf+9, 13));
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PrintAndLog("Remaining Header Area");
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PrintAndLog("%s", sprint_hex(data_buf+9, 13));
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}
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}
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}
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uint8_t segCrcBytes[8] = {0x00};
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uint8_t segCrcBytes[8] = {0,0,0,0,0,0,0,0};
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uint32_t segCalcCRC = 0;
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uint32_t segCRC = 0;
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// Data card?
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if(dcf <= 60000) {
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PrintAndLog("\nADF: User Area");
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PrintAndLog("------------------------------------------------------");
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PrintAndLog("\nADF: User Area");
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PrintAndLog("------------------------------------------------------");
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if(bIsSegmented) {
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// Data start point on segmented cards
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i = 22;
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i = 22;
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// decode segments
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for (segmentNum=1; segmentNum < 128; segmentNum++ )
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{
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segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
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segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
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wrp = (data_buf[i+2]^crc);
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wrc = ((data_buf[i+3]^crc)&0x70)>>4;
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segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
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segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
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wrp = (data_buf[i+2]^crc);
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wrc = ((data_buf[i+3]^crc)&0x70)>>4;
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bool hasWRC = (wrc > 0);
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bool hasWRP = (wrp > wrc);
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int wrp_len = (wrp - wrc);
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int remain_seg_payload_len = (segment_len - wrp - 5);
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bool hasWRC = (wrc > 0);
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bool hasWRP = (wrp > wrc);
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int wrp_len = (wrp - wrc);
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int remain_seg_payload_len = (segment_len - wrp - 5);
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// validate segment-crc
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segCrcBytes[0]=data_buf[0]; //uid0
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segCrcBytes[1]=data_buf[1]; //uid1
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segCrcBytes[2]=data_buf[2]; //uid2
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segCrcBytes[3]=data_buf[3]; //uid3
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segCrcBytes[4]=(data_buf[i]^crc); //hdr0
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segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
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segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
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segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
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// validate segment-crc
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segCrcBytes[0]=data_buf[0]; //uid0
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segCrcBytes[1]=data_buf[1]; //uid1
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segCrcBytes[2]=data_buf[2]; //uid2
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segCrcBytes[3]=data_buf[3]; //uid3
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segCrcBytes[4]=(data_buf[i]^crc); //hdr0
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segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
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segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
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segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
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segCalcCRC = CRC8Legic(segCrcBytes, 8);
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segCRC = data_buf[i+4]^crc;
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segCalcCRC = CRC8Legic(segCrcBytes, 8);
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segCRC = data_buf[i+4]^crc;
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PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
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segmentNum,
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data_buf[i]^crc,
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data_buf[i+1]^crc,
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data_buf[i+2]^crc,
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data_buf[i+3]^crc,
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segment_len,
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segment_flag,
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(segment_flag & 0x4) >> 2,
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(segment_flag & 0x8) >> 3,
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wrp,
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wrc,
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((data_buf[i+3]^crc) & 0x80) >> 7,
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segCRC,
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( segCRC == segCalcCRC ) ? "OK" : "fail"
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);
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PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
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segmentNum,
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data_buf[i]^crc,
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data_buf[i+1]^crc,
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data_buf[i+2]^crc,
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data_buf[i+3]^crc,
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segment_len,
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segment_flag,
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(segment_flag & 0x4) >> 2,
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(segment_flag & 0x8) >> 3,
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wrp,
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wrc,
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((data_buf[i+3]^crc) & 0x80) >> 7,
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segCRC,
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( segCRC == segCalcCRC ) ? "OK" : "fail"
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);
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i += 5;
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i += 5;
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if ( hasWRC ) {
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PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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if ( hasWRC ) {
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PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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for ( k=i; k < (i+wrc); ++k)
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data_buf[k] ^= crc;
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data_buf[k] ^= crc;
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print_hex_break( data_buf+i, wrc, 16);
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print_hex_break( data_buf+i, wrc, 16);
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i += wrc;
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}
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i += wrc;
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}
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if ( hasWRP ) {
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PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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if ( hasWRP ) {
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PrintAndLog("Remaining write protected area: (I %d | K %d | WRC %d | WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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for (k=i; k < (i+wrp_len); ++k)
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data_buf[k] ^= crc;
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data_buf[k] ^= crc;
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print_hex_break( data_buf+i, wrp_len, 16);
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print_hex_break( data_buf+i, wrp_len, 16);
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i += wrp_len;
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i += wrp_len;
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// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
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if( wrp_len == 8 )
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PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
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}
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if( wrp_len == 8 )
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PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
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}
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PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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for ( k=i; k < (i+remain_seg_payload_len); ++k)
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data_buf[k] ^= crc;
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data_buf[k] ^= crc;
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print_hex_break( data_buf+i, remain_seg_payload_len, 16);
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print_hex_break( data_buf+i, remain_seg_payload_len, 16);
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i += remain_seg_payload_len;
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i += remain_seg_payload_len;
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PrintAndLog("-----+------------------------------------------------\n");
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PrintAndLog("-----+------------------------------------------------\n");
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// end with last segment
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if (segment_flag & 0x8) return 0;
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// end with last segment
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if (segment_flag & 0x8) return 0;
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} // end for loop
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} // end for loop
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} else {
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// Data start point on unsegmented cards
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i = 8;
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wrp = data_buf[7] & 0x0F;
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wrc = (data_buf[7] & 0x07) >> 4; // ICEMAN 20160802, this will always be ZERO
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wrp = data_buf[7] & 0x0F;
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wrc = (data_buf[7] & 0x707) >> 4;
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bool hasWRC = (wrc > 0);
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bool hasWRP = (wrp > wrc);
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@ -322,7 +325,7 @@ int CmdLegicDecode(const char *Cmd) {
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PrintAndLog("Remaining write protected area: (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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print_hex_break( data_buf+i, wrp_len, 16);
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print_hex_break( data_buf + i, wrp_len, 16);
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i += wrp_len;
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// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
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@ -333,7 +336,7 @@ int CmdLegicDecode(const char *Cmd) {
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PrintAndLog("Remaining segment payload: (I %d | Remain LEN %d)", i, remain_seg_payload_len);
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PrintAndLog("\nrow | data");
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PrintAndLog("-----+------------------------------------------------");
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print_hex_break( data_buf+i, remain_seg_payload_len, 16);
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print_hex_break( data_buf + i, remain_seg_payload_len, 16);
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i += remain_seg_payload_len;
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PrintAndLog("-----+------------------------------------------------\n");
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@ -351,7 +354,7 @@ int CmdLegicRFRead(const char *Cmd) {
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char cmdp = param_getchar(Cmd, 0);
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if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
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int byte_count=0, offset=0;
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int byte_count = 0, offset = 0;
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sscanf(Cmd, "%i %i", &offset, &byte_count);
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if(byte_count == 0) byte_count = -1;
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if(byte_count + offset > 1024) byte_count = 1024 - offset;
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@ -362,8 +365,10 @@ int CmdLegicRFRead(const char *Cmd) {
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return 0;
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}
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int CmdLegicLoad(const char *Cmd) {
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// iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)
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char cmdp = param_getchar(Cmd, 0);
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if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
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@ -444,9 +449,11 @@ int CmdLegicSave(const char *Cmd) {
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int requested = 1024;
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int offset = 0;
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int delivered = 0;
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char filename[FILE_PATH_SIZE];
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char filename[FILE_PATH_SIZE] = {0x00};
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uint8_t got[1024] = {0x00};
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memset(filename, 0, FILE_PATH_SIZE);
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sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
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/* If no length given save entire legic read buffer */
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@ -501,7 +508,7 @@ int CmdLegicRfSim(const char *Cmd) {
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//TODO: write a help text (iceman)
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int CmdLegicRfWrite(const char *Cmd) {
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UsbCommand c = {CMD_WRITER_LEGIC_RF};
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UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
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int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
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if(res != 2) {
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PrintAndLog("Please specify the offset and length as two hex strings");
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