Merge pull request #12 from k02a/patch-1

[proxmark3-svn] / client / cmdhflegic.c

diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index 18c4f7360846eba2fe6864af4b8eec44f77027a8..0262f81c5560a7e1160b9dde859d7fb9f8d26e04 100644 (file)
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -38,33 +38,48 @@ int usage_legic_load(void){
        return 0;
 }
 
        return 0;
 }
 

+int usage_legic_read(void){    
+       PrintAndLog("Read data from a legic tag.");
+       PrintAndLog("Usage:  hf legic read <offset> <num of bytes>");
+       PrintAndLog("Options :");
+       PrintAndLog("  <offset>        : offset in data array to start download from");
+       PrintAndLog("  <num of bytes>  : number of bytes to download");
+       PrintAndLog("");
+       PrintAndLog(" sample: hf legic read");
+       return 0;
+}
+

 /*
  *  Output BigBuf and deobfuscate LEGIC RF tag data.
 /*
  *  Output BigBuf and deobfuscate LEGIC RF tag data.

- *   This is based on information given in the talk held
+ *  This is based on information given in the talk held

  *  by Henryk Ploetz and Karsten Nohl at 26c3
  */
 int CmdLegicDecode(const char *Cmd) {
  *  by Henryk Ploetz and Karsten Nohl at 26c3
  */
 int CmdLegicDecode(const char *Cmd) {

-       int i, k, n;
+       // Index for the bytearray.
+       int i = 0;
+       int k = 0, segmentNum;

        int segment_len = 0;
        int segment_flag = 0;
        uint8_t stamp_len = 0;
        int crc = 0;
        int wrp = 0;
        int wrc = 0;
        int segment_len = 0;
        int segment_flag = 0;
        uint8_t stamp_len = 0;
        int crc = 0;
        int wrp = 0;
        int wrc = 0;

-       uint8_t data_buf[1200]; // receiver buffer
-       //char out_string[3076]; // just use big buffer - bad practice
+       uint8_t data_buf[1024]; // receiver buffer,  should be 1024..

        char token_type[4];
 
        char token_type[4];
 

-       // copy data from proxmark into buffer
-       GetFromBigBuf(data_buf,sizeof(data_buf),0);
-       WaitForResponse(CMD_ACK,NULL);
-
+       // download EML memory, where the "legic read" command puts the data.
+       GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
+       if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
+               PrintAndLog("Command execute timeout");
+               return 1;
+       }
+       

        // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
        crc = data_buf[4];
        uint32_t calc_crc =  CRC8Legic(data_buf, 4);    
        
        PrintAndLog("\nCDF: System Area");
        // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
        crc = data_buf[4];
        uint32_t calc_crc =  CRC8Legic(data_buf, 4);    
        
        PrintAndLog("\nCDF: System Area");

-
+       PrintAndLog("------------------------------------------------------");

        PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
                data_buf[0],
                data_buf[1],
        PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
                data_buf[0],
                data_buf[1],


@@ -74,24 +89,24 @@ int CmdLegicDecode(const char *Cmd) {
                (calc_crc == crc) ? "OK":"Fail" 
        );
  
                (calc_crc == crc) ? "OK":"Fail" 
        );
  

-       switch (data_buf[5]&0x7f) {
+       switch (data_buf[5] & 0x7f) {

                case 0x00 ... 0x2f:
                        strncpy(token_type, "IAM",sizeof(token_type));
                        break;
                case 0x30 ... 0x6f:
                case 0x00 ... 0x2f:
                        strncpy(token_type, "IAM",sizeof(token_type));
                        break;
                case 0x30 ... 0x6f:

-                       strcpy(token_type, "SAM");
+                       strncpy(token_type, "SAM",sizeof(token_type));

                        break;
                case 0x70 ... 0x7f:
                        break;
                case 0x70 ... 0x7f:

-                       strcpy(token_type, "GAM");
+                       strncpy(token_type, "GAM",sizeof(token_type));

                        break;
                default:
                        break;
                default:

-                       strcpy(token_type, "???");
+                       strncpy(token_type, "???",sizeof(token_type));

                        break;
        }
 
        stamp_len = 0xfc - data_buf[6];
 
                        break;
        }
 
        stamp_len = 0xfc - data_buf[6];
 

-       PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
+       PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",

                data_buf[5],
                data_buf[6],
                token_type,
                data_buf[5],
                data_buf[6],
                token_type,


@@ -109,91 +124,123 @@ int CmdLegicDecode(const char *Cmd) {
 
        PrintAndLog("Remaining Header Area");
        PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 
        PrintAndLog("Remaining Header Area");
        PrintAndLog("%s", sprint_hex(data_buf+9, 13));

-       PrintAndLog("\nADF: User Area");
-  
-       i = 22;  
+       

        uint8_t segCrcBytes[8] = {0x00};
        uint32_t segCalcCRC = 0;
        uint32_t segCRC = 0;
        uint8_t segCrcBytes[8] = {0x00};
        uint32_t segCalcCRC = 0;
        uint32_t segCRC = 0;

+
+       // see if user area is xored or just zeros.
+       int numOfZeros = 0;
+       for (int index=22; index < 256; ++index){
+               if ( data_buf[index] == 0x00 )
+                       ++numOfZeros;
+       }
+       // if possible zeros is less then 60%, lets assume data is xored
+       // 256  - 22 (header) = 234
+       // 1024 - 22 (header) = 1002
+       int isXored = (numOfZeros*100/stamp_len) < 50;
+       PrintAndLog("is data xored?  %d  ( %d %)", isXored, (numOfZeros*100/stamp_len));
+
+       print_hex_break( data_buf, 33, 16);
+       
+       return 0;

        
        

-       for ( n=0; n<64; n++ ) {
+       PrintAndLog("\nADF: User Area");
+       PrintAndLog("------------------------------------------------------");
+       i = 22;  
+       // 64 potential segements
+       // how to detect there is no segments?!?
+       for ( segmentNum=0; segmentNum<64; segmentNum++ ) {

                segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
                segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 
                wrp = (data_buf[i+2]^crc);
                wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 
                segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
                segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 
                wrp = (data_buf[i+2]^crc);
                wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 

-               /* validate segment-crc */
-               segCRC = data_buf[i+4]^crc;
+               bool hasWRC = (wrc > 0);
+               bool hasWRP = (wrp > wrc);
+               int wrp_len = (wrp - wrc);
+               int remain_seg_payload_len = (segment_len - wrp - 5);

                
                

-               segCrcBytes[0]=data_buf[0]; //uid0
-               segCrcBytes[1]=data_buf[1]; //uid1
-               segCrcBytes[2]=data_buf[2]; //uid2
-               segCrcBytes[3]=data_buf[3]; //uid3
-               segCrcBytes[4]=(data_buf[i]^crc); //hdr0
+               // validate segment-crc
+               segCrcBytes[0]=data_buf[0];                     //uid0
+               segCrcBytes[1]=data_buf[1];                     //uid1
+               segCrcBytes[2]=data_buf[2];                     //uid2
+               segCrcBytes[3]=data_buf[3];                     //uid3
+               segCrcBytes[4]=(data_buf[i]^crc);       //hdr0

                segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
                segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
                segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
                segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
                segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
                segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3

+

                segCalcCRC = CRC8Legic(segCrcBytes, 8);
                segCalcCRC = CRC8Legic(segCrcBytes, 8);

+               segCRC = data_buf[i+4]^crc;

 
 

-               PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x  (%s)",
-                       n,
+               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)",
+                       segmentNum,

                        data_buf[i]^crc,
                        data_buf[i+1]^crc,
                        data_buf[i+2]^crc,
                        data_buf[i+3]^crc,
                        data_buf[i]^crc,
                        data_buf[i+1]^crc,
                        data_buf[i+2]^crc,
                        data_buf[i+3]^crc,

+                       segment_len, 

                        segment_flag,
                        segment_flag,

-                       (segment_flag&0x4)>>2,
-                       (segment_flag&0x8)>>3,
-                       segment_len,
+                       (segment_flag & 0x4) >> 2,
+                       (segment_flag & 0x8) >> 3,

                        wrp,
                        wrc,
                        wrp,
                        wrc,

-                       ((data_buf[i+3]^crc)&0x80)>>7,
+                       ((data_buf[i+3]^crc) & 0x80) >> 7,

                        segCRC,
                        ( segCRC == segCalcCRC ) ? "OK" : "fail"
                );
 
                i += 5;
     
                        segCRC,
                        ( segCRC == segCalcCRC ) ? "OK" : "fail"
                );
 
                i += 5;
     

-               if ( wrc>0 ) {
-                       PrintAndLog("WRC protected area:");
-                       
-                       for ( k=i; k < wrc; k++)
-                               data_buf[k] ^= crc;
-                       
-                       for ( k=i; k < wrc; k += 8)
-                               PrintAndLog("%s", sprint_hex( data_buf+k, 8)  );
+               if ( hasWRC ) {
+                       PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
+                       PrintAndLog("\nrow  | data");
+                       PrintAndLog("-----+------------------------------------------------");
+                       // de-xor?  if not zero, assume it needs xoring.
+                       if ( isXored) {
+                               for ( k=i; k < wrc; ++k)
+                                       data_buf[k] ^= crc;
+                       }
+                       print_hex_break( data_buf+i, wrc, 16);

                        
                        i += wrc;
                }
     
                        
                        i += wrc;
                }
     

-               if ( wrp>wrc ) {
-                       PrintAndLog("Remaining write protected area:");
+               if ( hasWRP ) {
+                       PrintAndLog("Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
+                       PrintAndLog("\nrow  | data");
+                       PrintAndLog("-----+------------------------------------------------");

 
 

-                       if ( data_buf[k] > 0) {
-                               for (k=i; k < (wrp-wrc); k++)
+                       if (isXored) {
+                               for (k=i; k < wrp_len; ++k)

                                        data_buf[k] ^= crc;
                        }
                        
                                        data_buf[k] ^= crc;
                        }
                        

-                       for (k=i; k < (wrp-wrc); k++)
-                               PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
-
-                       i += (wrp-wrc);
+                       print_hex_break( data_buf+i, wrp_len, 16);

                        
                        

-                       if( (wrp-wrc) == 8 )
+                       i += wrp_len;
+                       
+                       // does this one work?
+                       if( wrp_len == 8 )

                                PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);                   
                }
     
                                PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);                   
                }
     

-               PrintAndLog("Remaining segment payload:");
-               
-               if ( data_buf[k] > 0 ) {
-                       for ( k=i; k < (segment_len - wrp - 5); k++)
+               PrintAndLog("Remaining segment payload:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
+               PrintAndLog("\nrow  | data");
+               PrintAndLog("-----+------------------------------------------------");
+               if ( isXored ) {
+                       for ( k=i; k < remain_seg_payload_len; ++k)

                                data_buf[k] ^= crc;
                }
                
                                data_buf[k] ^= crc;
                }
                

-               for ( k=i; k < (segment_len - wrp - 5); k++)
-                       PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
+               print_hex_break( data_buf+i, remain_seg_payload_len, 16);

     
     

+               i += remain_seg_payload_len;
+               
+               PrintAndLog("-----+------------------------------------------------\n");
+

                // end with last segment
                if (segment_flag & 0x8) return 0;
 
                // end with last segment
                if (segment_flag & 0x8) return 0;
 


@@ -202,6 +249,13 @@ int CmdLegicDecode(const char *Cmd) {
 }
 
 int CmdLegicRFRead(const char *Cmd) {
 }
 
 int CmdLegicRFRead(const char *Cmd) {

+       
+       // params:
+       // offset in data
+       // number of bytes.
+       char cmdp = param_getchar(Cmd, 0);
+       if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
+       

        int byte_count=0, offset=0;
        sscanf(Cmd, "%i %i", &offset, &byte_count);
        if(byte_count == 0) byte_count = -1;
        int byte_count=0, offset=0;
        sscanf(Cmd, "%i %i", &offset, &byte_count);
        if(byte_count == 0) byte_count = -1;


@@ -262,8 +316,11 @@ int CmdLegicLoad(const char *Cmd) {
                        memcpy(c.d.asBytes, data, sizeof(data));
                        clearCommandBuffer();
                        SendCommand(&c);
                        memcpy(c.d.asBytes, data, sizeof(data));
                        clearCommandBuffer();
                        SendCommand(&c);

-                       WaitForResponse(CMD_ACK, NULL);
-
+                       if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+                               PrintAndLog("Command execute timeout");
+                               fclose(f);
+                               return 1;
+                       }

                        offset += index;
                        totalbytes += index;
                        index = 0;
                        offset += index;
                        totalbytes += index;
                        index = 0;


@@ -277,7 +334,10 @@ int CmdLegicLoad(const char *Cmd) {
                memcpy(c.d.asBytes, data, 8);
                clearCommandBuffer();
                SendCommand(&c);
                memcpy(c.d.asBytes, data, 8);
                clearCommandBuffer();
                SendCommand(&c);

-               WaitForResponse(CMD_ACK, NULL);
+               if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
+                               PrintAndLog("Command execute timeout");
+                               return 1;
+               }

                totalbytes += index;            
        }
        
                totalbytes += index;            
        }
        


@@ -309,15 +369,18 @@ int CmdLegicSave(const char *Cmd) {
                return 0;
        }
 
                return 0;
        }
 

+       GetFromBigBuf(got, requested, offset);
+       if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
+               PrintAndLog("Command execute timeout"); 
+               return 1;
+       }
+

        FILE *f = fopen(filename, "w");
        if(!f) {
                PrintAndLog("couldn't open '%s'", Cmd+1);
                return -1;
        }
        FILE *f = fopen(filename, "w");
        if(!f) {
                PrintAndLog("couldn't open '%s'", Cmd+1);
                return -1;
        }

-
-       GetFromBigBuf(got,requested,offset);
-       WaitForResponse(CMD_ACK,NULL);
-
+       

        for (int j = 0; j < requested; j += 8) {
                fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
                        got[j+0], got[j+1], got[j+2], got[j+3],
        for (int j = 0; j < requested; j += 8) {
                fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
                        got[j+0], got[j+1], got[j+2], got[j+3],


@@ -332,6 +395,7 @@ int CmdLegicSave(const char *Cmd) {
        return 0;
 }
 
        return 0;
 }
 

+//TODO: write a help text (iceman)

 int CmdLegicRfSim(const char *Cmd) {
        UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
        sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 int CmdLegicRfSim(const char *Cmd) {
        UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
        sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);


@@ -340,6 +404,7 @@ int CmdLegicRfSim(const char *Cmd) {
        return 0;
 }
 
        return 0;
 }
 

+//TODO: write a help text (iceman)

 int CmdLegicRfWrite(const char *Cmd) {
     UsbCommand c = {CMD_WRITER_LEGIC_RF};
     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 int CmdLegicRfWrite(const char *Cmd) {
     UsbCommand c = {CMD_WRITER_LEGIC_RF};
     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);


@@ -379,12 +444,16 @@ int CmdLegicRfFill(const char *Cmd) {
 int CmdLegicCalcCrc8(const char *Cmd){
 
        int len =  strlen(Cmd); 
 int CmdLegicCalcCrc8(const char *Cmd){
 
        int len =  strlen(Cmd); 

-       if (len & 1 ) return usage_legic_calccrc8(); 
+       if ( len & 1 ) return usage_legic_calccrc8(); 

        
        

-       uint8_t *data = malloc(len);
+       // add 1 for null terminator.
+       uint8_t *data = malloc(len+1);

        if ( data == NULL ) return 1;
                
        if ( data == NULL ) return 1;
                

-       param_gethex(Cmd, 0, data, len );
+       if (param_gethex(Cmd, 0, data, len )) {
+               free(data);
+               return usage_legic_calccrc8();  
+       }

        
        uint32_t checksum =  CRC8Legic(data, len/2);    
        PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
        
        uint32_t checksum =  CRC8Legic(data, len/2);    
        PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );