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Commit | Line | Data |
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8e220a91 | 1 | #include <stdio.h> |
2 | #include <string.h> | |
7fe9b0b7 | 3 | #include "proxusb.h" |
41dab153 | 4 | #include "data.h" |
5 | #include "ui.h" | |
7fe9b0b7 | 6 | #include "cmdparser.h" |
7 | #include "cmdhflegic.h" | |
669c1b80 | 8 | #include "cmdmain.h" |
7fe9b0b7 | 9 | |
10 | static int CmdHelp(const char *Cmd); | |
11 | ||
7fe9b0b7 | 12 | static command_t CommandTable[] = |
13 | { | |
14 | {"help", CmdHelp, 1, "This help"}, | |
669c1b80 | 15 | {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"}, |
41dab153 | 16 | {"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"}, |
7fe9b0b7 | 17 | {NULL, NULL, 0, NULL} |
18 | }; | |
19 | ||
20 | int CmdHFLegic(const char *Cmd) | |
21 | { | |
22 | CmdsParse(CommandTable, Cmd); | |
23 | return 0; | |
24 | } | |
25 | ||
26 | int CmdHelp(const char *Cmd) | |
27 | { | |
28 | CmdsHelp(CommandTable); | |
29 | return 0; | |
30 | } | |
669c1b80 | 31 | |
32 | /* | |
33 | * Output BigBuf and deobfuscate LEGIC RF tag data. | |
34 | * This is based on information given in the talk held | |
35 | * by Henryk Ploetz and Karsten Nohl at 26c3 | |
36 | * FIXME: will crash if sample buffer does not contain valid legic data | |
37 | */ | |
38 | int CmdLegicDecode(const char *Cmd) | |
39 | { | |
40 | int h, i, j, k, n; | |
41 | int segment_len = 0; | |
42 | int segment_flag = 0; | |
43 | int stamp_len = 0; | |
44 | int crc = 0; | |
45 | int wrp = 0; | |
46 | int wrc = 0; | |
47 | int data_buf[1032]; // receiver buffer | |
48 | char out_string[3076]; // just use big buffer - bad practice | |
49 | char token_type[4]; | |
50 | int delivered = 0; | |
51 | ||
52 | h = 0; | |
53 | ||
54 | // copy data from proxmark into buffer | |
55 | for (i = 0; i < 256; i += 12, h += 48) { | |
56 | UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}}; | |
57 | SendCommand(&c); | |
58 | WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K); | |
59 | ||
60 | for (j = 0; j < 48; j += 8) { | |
61 | for (k = 0; k < 8; k++) { | |
62 | data_buf[h+j+k] = sample_buf[j+k]; | |
63 | } | |
64 | delivered += 8; | |
65 | if (delivered >= 1024) | |
66 | break; | |
67 | } | |
68 | } | |
69 | ||
70 | // Output CDF System area (9 bytes) plus remaining header area (12 bytes) | |
71 | ||
72 | PrintAndLog("\nCDF: System Area"); | |
73 | ||
74 | PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x", | |
75 | data_buf[0], | |
76 | data_buf[1], | |
77 | data_buf[2], | |
78 | data_buf[3], | |
79 | data_buf[4] | |
80 | ); | |
81 | ||
82 | crc = data_buf[4]; | |
83 | ||
84 | switch (data_buf[5]&0x7f) { | |
85 | case 0x00 ... 0x2f: | |
86 | strncpy(token_type, "IAM",sizeof(token_type)); | |
87 | break; | |
88 | case 0x30 ... 0x6f: | |
89 | strcpy(token_type, "SAM"); | |
90 | break; | |
91 | case 0x70 ... 0x7f: | |
92 | strcpy(token_type, "GAM"); | |
93 | break; | |
94 | default: | |
95 | strcpy(token_type, "???"); | |
96 | break; | |
97 | } | |
98 | ||
99 | stamp_len = 0xfc - data_buf[6]; | |
100 | ||
101 | PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u", | |
102 | data_buf[5], | |
103 | data_buf[6], | |
104 | token_type, | |
105 | (data_buf[5]&0x80)>>7, | |
106 | stamp_len | |
107 | ); | |
108 | ||
109 | PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x", | |
110 | data_buf[7]&0x0f, | |
111 | (data_buf[7]&0x70)>>4, | |
112 | (data_buf[7]&0x80)>>7, | |
113 | data_buf[7], | |
114 | data_buf[8] | |
115 | ); | |
116 | ||
117 | PrintAndLog("Remaining Header Area"); | |
118 | ||
119 | PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", | |
120 | data_buf[9], | |
121 | data_buf[10], | |
122 | data_buf[11], | |
123 | data_buf[12], | |
124 | data_buf[13], | |
125 | data_buf[14], | |
126 | data_buf[15], | |
127 | data_buf[16], | |
128 | data_buf[17], | |
129 | data_buf[18], | |
130 | data_buf[19], | |
131 | data_buf[20], | |
132 | data_buf[21] | |
133 | ); | |
134 | ||
135 | PrintAndLog("\nADF: User Area"); | |
136 | ||
41dab153 | 137 | i = 22; |
669c1b80 | 138 | for (n=0; n<64; n++) { |
139 | segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc); | |
140 | segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4; | |
141 | ||
142 | wrp = (data_buf[i+2]^crc); | |
143 | wrc = ((data_buf[i+3]^crc)&0x70)>>4; | |
144 | ||
145 | 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", | |
146 | n, | |
147 | data_buf[i]^crc, | |
148 | data_buf[i+1]^crc, | |
149 | data_buf[i+2]^crc, | |
150 | data_buf[i+3]^crc, | |
151 | segment_flag, | |
152 | (segment_flag&0x4)>>2, | |
153 | (segment_flag&0x8)>>3, | |
154 | segment_len, | |
155 | wrp, | |
156 | wrc, | |
157 | ((data_buf[i+3]^crc)&0x80)>>7, | |
158 | (data_buf[i+4]^crc) | |
159 | ); | |
160 | ||
161 | i+=5; | |
162 | ||
163 | if (wrc>0) { | |
164 | PrintAndLog("WRC protected area:"); | |
165 | for (k=0, j=0; k < wrc; k++, i++, j += 3) { | |
166 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); | |
167 | out_string[j+2] = ' '; | |
168 | }; | |
169 | ||
170 | out_string[j] = '\0'; | |
171 | ||
172 | PrintAndLog("%s", out_string); | |
173 | } | |
174 | ||
175 | if (wrp>wrc) { | |
176 | PrintAndLog("Remaining write protected area:"); | |
177 | ||
178 | for (k=0, j=0; k < (wrp-wrc); k++, i++, j += 3) { | |
179 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); | |
180 | out_string[j+2] = ' '; | |
181 | }; | |
182 | ||
183 | out_string[j] = '\0'; | |
184 | ||
185 | PrintAndLog("%s", out_string); | |
186 | if((wrp-wrc) == 8) { | |
187 | sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc); | |
188 | PrintAndLog("%s", out_string); | |
189 | } | |
190 | } | |
191 | ||
192 | PrintAndLog("Remaining segment payload:"); | |
193 | for (k=0, j=0; k < (segment_len - wrp - 5); k++, i++, j += 3) { | |
194 | sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); | |
195 | out_string[j+2] = ' '; | |
196 | }; | |
197 | ||
198 | out_string[j] = '\0'; | |
199 | ||
200 | PrintAndLog("%s", out_string); | |
201 | ||
202 | // end with last segment | |
203 | if (segment_flag & 0x8) | |
204 | return 0; | |
205 | }; | |
206 | return 0; | |
207 | } | |
41dab153 | 208 | |
209 | int CmdLegicRFRead(const char *Cmd) | |
210 | { | |
211 | int byte_count=0,offset=0; | |
212 | sscanf(Cmd, "%i %i", &offset, &byte_count); | |
213 | if(byte_count == 0) byte_count = 256; | |
214 | if(byte_count + offset > 256) byte_count = 256 - offset; | |
215 | UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}}; | |
216 | SendCommand(&c); | |
217 | return 0; | |
218 | } |