mirror of
https://github.com/Proxmark/proxmark3.git
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360 lines
12 KiB
C
360 lines
12 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2019 Merlok
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// NFC Data Exchange Format (NDEF) functions
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//-----------------------------------------------------------------------------
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#include "ndef.h"
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#include "ui.h"
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#include "emv/dump.h"
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#include "crypto/asn1utils.h"
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#include "util.h"
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#include <string.h>
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#define STRBOOL(p) ((p) ? "+" : "-")
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static const char *TypeNameFormat_s[] = {
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"Empty Record",
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"Well Known Record",
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"MIME Media Record",
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"Absolute URI Record",
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"External Record",
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"Unknown Record",
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"Unchanged Record",
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"n/a"
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};
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static const char *ndefSigType_s[] = {
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"Not present", // No signature present
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"RSASSA_PSS_SHA_1", // PKCS_1
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"RSASSA_PKCS1_v1_5_WITH_SHA_1", // PKCS_1
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"DSA",
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"ECDSA",
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"n/a"
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};
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static const char *ndefCertificateFormat_s[] = {
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"X_509",
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"X9_68",
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"n/a"
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};
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static const char *URI_s[] = {
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"", // 0x00
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"http://www.", // 0x01
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"https://www.", // 0x02
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"http://", // 0x03
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"https://", // 0x04
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"tel:", // 0x05
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"mailto:", // 0x06
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"ftp://anonymous:anonymous@", // 0x07
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"ftp://ftp.", // 0x08
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"ftps://", // 0x09
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"sftp://", // 0x0A
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"smb://", // 0x0B
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"nfs://", // 0x0C
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"ftp://", // 0x0D
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"dav://", // 0x0E
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"news:", // 0x0F
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"telnet://", // 0x10
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"imap:", // 0x11
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"rtsp://", // 0x12
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"urn:", // 0x13
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"pop:", // 0x14
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"sip:", // 0x15
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"sips:", // 0x16
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"tftp:", // 0x17
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"btspp://", // 0x18
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"btl2cap://", // 0x19
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"btgoep://", // 0x1A
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"tcpobex://", // 0x1B
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"irdaobex://", // 0x1C
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"file://", // 0x1D
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"urn:epc:id:", // 0x1E
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"urn:epc:tag:", // 0x1F
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"urn:epc:pat:", // 0x20
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"urn:epc:raw:", // 0x21
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"urn:epc:", // 0x22
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"urn:nfc:" // 0x23
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};
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uint16_t ndefTLVGetLength(uint8_t *data, size_t *indx) {
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uint16_t len = 0;
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if (data[0] == 0xff) {
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len = (data[1] << 8) + data[2];
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*indx += 3;
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} else {
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len = data[0];
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*indx += 1;
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}
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return len;
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}
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int ndefDecodeHeader(uint8_t *data, size_t datalen, NDEFHeader_t *header) {
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header->Type = NULL;
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header->Payload = NULL;
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header->ID = NULL;
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header->MessageBegin = data[0] & 0x80;
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header->MessageEnd = data[0] & 0x40;
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header->ChunkFlag = data[0] & 0x20;
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header->ShortRecordBit = data[0] & 0x10;
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header->IDLenPresent = data[0] & 0x08;
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header->TypeNameFormat = data[0] & 0x07;
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header->len = 1 + 1 + (header->ShortRecordBit ? 1 : 4) + (header->IDLenPresent ? 1 : 0); // header + typelen + payloadlen + idlen
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if (header->len > datalen)
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return 1;
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header->TypeLen = data[1];
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header->Type = data + header->len;
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header->PayloadLen = (header->ShortRecordBit ? (data[2]) : ((data[2] << 24) + (data[3] << 16) + (data[4] << 8) + data[5]));
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if (header->IDLenPresent) {
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header->IDLen = (header->ShortRecordBit ? (data[3]) : (data[6]));
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header->Payload = header->Type + header->TypeLen;
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} else {
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header->IDLen = 0;
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}
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header->Payload = header->Type + header->TypeLen + header->IDLen;
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header->RecLen = header->len + header->TypeLen + header->PayloadLen + header->IDLen;
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if (header->RecLen > datalen)
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return 3;
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return 0;
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}
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int ndefPrintHeader(NDEFHeader_t *header) {
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PrintAndLogEx(INFO, "Header:");
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PrintAndLogEx(NORMAL, "\tMessage Begin: %s", STRBOOL(header->MessageBegin));
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PrintAndLogEx(NORMAL, "\tMessage End: %s", STRBOOL(header->MessageEnd));
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PrintAndLogEx(NORMAL, "\tChunk Flag: %s", STRBOOL(header->ChunkFlag));
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PrintAndLogEx(NORMAL, "\tShort Record Bit: %s", STRBOOL(header->ShortRecordBit));
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PrintAndLogEx(NORMAL, "\tID Len Present: %s", STRBOOL(header->IDLenPresent));
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PrintAndLogEx(NORMAL, "\tType Name Format: [0x%02x] %s", header->TypeNameFormat, TypeNameFormat_s[header->TypeNameFormat]);
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PrintAndLogEx(NORMAL, "\tHeader length : %d", header->len);
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PrintAndLogEx(NORMAL, "\tType length : %d", header->TypeLen);
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PrintAndLogEx(NORMAL, "\tPayload length : %d", header->PayloadLen);
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PrintAndLogEx(NORMAL, "\tID length : %d", header->IDLen);
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PrintAndLogEx(NORMAL, "\tRecord length : %d", header->RecLen);
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return 0;
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}
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int ndefDecodeSig(uint8_t *sig, size_t siglen) {
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size_t indx = 0;
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PrintAndLogEx(NORMAL, "\tsignature version: 0x%02x", sig[0]);
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if (sig[0] != 0x01) {
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PrintAndLogEx(ERR, "signature version unknown.");
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return 1;
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}
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indx++;
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uint8_t sigType = sig[indx] & 0x7f;
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bool sigURI = sig[indx] & 0x80;
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PrintAndLogEx(NORMAL, "\tsignature type: %s", ((sigType < stNA) ? ndefSigType_s[sigType] : ndefSigType_s[stNA]));
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PrintAndLogEx(NORMAL, "\tsignature uri: %s", (sigURI ? "present" : "not present"));
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size_t intsiglen = (sig[indx + 1] << 8) + sig[indx + 2];
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// ecdsa 0x04
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if (sigType == stECDSA) {
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indx += 3;
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PrintAndLogEx(NORMAL, "\tsignature [%d]: %s", intsiglen, sprint_hex_inrow(&sig[indx], intsiglen));
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uint8_t rval[300] = {0};
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uint8_t sval[300] = {0};
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int res = ecdsa_asn1_get_signature(&sig[indx], intsiglen, rval, sval);
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if (!res) {
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PrintAndLogEx(NORMAL, "\t\tr: %s", sprint_hex(rval, 32));
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PrintAndLogEx(NORMAL, "\t\ts: %s", sprint_hex(sval, 32));
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}
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}
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indx += intsiglen;
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if (sigURI) {
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size_t intsigurilen = (sig[indx] << 8) + sig[indx + 1];
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indx += 2;
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PrintAndLogEx(NORMAL, "\tsignature uri [%d]: %.*s", intsigurilen, intsigurilen, &sig[indx]);
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indx += intsigurilen;
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}
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uint8_t certFormat = (sig[indx] >> 4) & 0x07;
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uint8_t certCount = sig[indx] & 0x0f;
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bool certURI = sig[indx] & 0x80;
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PrintAndLogEx(NORMAL, "\tcertificate format: %s", ((certFormat < sfNA) ? ndefCertificateFormat_s[certFormat] : ndefCertificateFormat_s[sfNA]));
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PrintAndLogEx(NORMAL, "\tcertificates count: %d", certCount);
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// print certificates
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indx++;
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for (int i = 0; i < certCount; i++) {
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size_t intcertlen = (sig[indx + 1] << 8) + sig[indx + 2];
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indx += 2;
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PrintAndLogEx(NORMAL, "\tcertificate %d [%d]: %s", i + 1, intcertlen, sprint_hex_inrow(&sig[indx], intcertlen));
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indx += intcertlen;
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}
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// have certificate uri
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if ((indx <= siglen) && certURI) {
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size_t inturilen = (sig[indx] << 8) + sig[indx + 1];
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indx += 2;
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PrintAndLogEx(NORMAL, "\tcertificate uri [%d]: %.*s", inturilen, inturilen, &sig[indx]);
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indx += inturilen;
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}
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return 0;
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};
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int ndefDecodePayload(NDEFHeader_t *ndef) {
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switch (ndef->TypeNameFormat) {
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case tnfWellKnownRecord:
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PrintAndLogEx(INFO, "Well Known Record");
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PrintAndLogEx(NORMAL, "\ttype: %.*s", ndef->TypeLen, ndef->Type);
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if (!strncmp((char *)ndef->Type, "T", ndef->TypeLen)) {
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PrintAndLogEx(NORMAL, "\ttext : %.*s", ndef->PayloadLen, ndef->Payload);
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}
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if (!strncmp((char *)ndef->Type, "U", ndef->TypeLen)) {
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PrintAndLogEx(NORMAL, "\turi : %s%.*s", (ndef->Payload[0] <= 0x23 ? URI_s[ndef->Payload[0]] : "[err]"), ndef->PayloadLen, &ndef->Payload[1]);
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}
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if (!strncmp((char *)ndef->Type, "Sig", ndef->TypeLen)) {
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ndefDecodeSig(ndef->Payload, ndef->PayloadLen);
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}
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break;
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case tnfAbsoluteURIRecord:
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PrintAndLogEx(INFO, "Absolute URI Record");
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PrintAndLogEx(NORMAL, "\ttype: %.*s", ndef->TypeLen, ndef->Type);
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PrintAndLogEx(NORMAL, "\tpayload: %.*s", ndef->PayloadLen, ndef->Payload);
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break;
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default:
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break;
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}
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return 0;
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}
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int ndefRecordDecodeAndPrint(uint8_t *ndefRecord, size_t ndefRecordLen) {
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NDEFHeader_t NDEFHeader = {0};
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int res = ndefDecodeHeader(ndefRecord, ndefRecordLen, &NDEFHeader);
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if (res)
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return res;
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ndefPrintHeader(&NDEFHeader);
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if (NDEFHeader.TypeLen) {
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PrintAndLogEx(INFO, "Type data:");
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dump_buffer(NDEFHeader.Type, NDEFHeader.TypeLen, stdout, 1);
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}
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if (NDEFHeader.IDLen) {
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PrintAndLogEx(INFO, "ID data:");
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dump_buffer(NDEFHeader.ID, NDEFHeader.IDLen, stdout, 1);
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}
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if (NDEFHeader.PayloadLen) {
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PrintAndLogEx(INFO, "Payload data:");
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dump_buffer(NDEFHeader.Payload, NDEFHeader.PayloadLen, stdout, 1);
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if (NDEFHeader.TypeLen)
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ndefDecodePayload(&NDEFHeader);
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}
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return 0;
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}
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int ndefRecordsDecodeAndPrint(uint8_t *ndefRecord, size_t ndefRecordLen) {
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bool firstRec = true;
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size_t len = 0;
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while (len < ndefRecordLen) {
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NDEFHeader_t NDEFHeader = {0};
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int res = ndefDecodeHeader(&ndefRecord[len], ndefRecordLen - len, &NDEFHeader);
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if (res)
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return res;
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if (firstRec) {
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if (!NDEFHeader.MessageBegin) {
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PrintAndLogEx(ERR, "NDEF first record have MessageBegin=false!");
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return 1;
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}
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firstRec = false;
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}
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if (NDEFHeader.MessageEnd && len + NDEFHeader.RecLen != ndefRecordLen) {
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PrintAndLogEx(ERR, "NDEF records have wrong length. Must be %d, calculated %d", ndefRecordLen, len + NDEFHeader.RecLen);
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return 1;
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}
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ndefRecordDecodeAndPrint(&ndefRecord[len], NDEFHeader.RecLen);
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len += NDEFHeader.RecLen;
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if (NDEFHeader.MessageEnd)
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break;
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}
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return 0;
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}
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int NDEFDecodeAndPrint(uint8_t *ndef, size_t ndefLen, bool verbose) {
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size_t indx = 0;
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PrintAndLogEx(INFO, "NDEF decoding:");
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while (indx < ndefLen) {
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switch (ndef[indx]) {
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case 0x00: {
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indx++;
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uint16_t len = ndefTLVGetLength(&ndef[indx], &indx);
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PrintAndLogEx(INFO, "-- NDEF NULL block.");
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if (len)
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PrintAndLogEx(WARNING, "NDEF NULL block size must be 0 instead of %d.", len);
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indx += len;
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break;
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}
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case 0x03: {
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indx++;
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uint16_t len = ndefTLVGetLength(&ndef[indx], &indx);
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PrintAndLogEx(INFO, "-- NDEF message. len: %d", len);
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int res = ndefRecordsDecodeAndPrint(&ndef[indx], len);
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if (res)
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return res;
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indx += len;
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break;
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}
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case 0xfd: {
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indx++;
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uint16_t len = ndefTLVGetLength(&ndef[indx], &indx);
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PrintAndLogEx(INFO, "-- NDEF proprietary info. Skipped %d bytes.", len);
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indx += len;
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break;
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}
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case 0xfe: {
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PrintAndLogEx(INFO, "-- NDEF Terminator. Done.");
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return 0;
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break;
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}
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default: {
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PrintAndLogEx(ERR, "unknown tag 0x%02x", ndef[indx]);
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return 1;
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}
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}
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}
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return 0;
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}
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