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Code Issues Activity

[EMV] Fix crash while PDOL parsing

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This commit is contained in:
Nikita Vostokov
2024-02-02 00:20:31 +00:00
parent dd4f873439
commit 9ceae3a3b2
1 changed files with 23 additions and 33 deletions
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56
lib/nfc/protocols/emv/emv_poller_i.c
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@@ -76,39 +76,6 @@ static void emv_trace(EmvPoller* instance, const char* message) {
} }
} }
static uint16_t emv_prepare_pdol(APDU* dest, APDU* src) {
bool tag_found;
for(uint16_t i = 0; i < src->size; i++) {
tag_found = false;
for(uint8_t j = 0; j < sizeof(pdol_values) / sizeof(PDOLValue*); j++) {
if(src->data[i] == pdol_values[j]->tag) {
// Found tag with 1 byte length
uint8_t len = src->data[++i];
memcpy(dest->data + dest->size, pdol_values[j]->data, len);
dest->size += len;
tag_found = true;
break;
} else if(((src->data[i] << 8) | src->data[i + 1]) == pdol_values[j]->tag) {
// Found tag with 2 byte length
i += 2;
uint8_t len = src->data[i];
memcpy(dest->data + dest->size, pdol_values[j]->data, len);
dest->size += len;
tag_found = true;
break;
}
}
if(!tag_found) {
// Unknown tag, fill zeros
i += 2;
uint8_t len = src->data[i];
memset(dest->data + dest->size, 0, len);
dest->size += len;
}
}
return dest->size;
}
static bool static bool
emv_decode_tlv_tag(const uint8_t* buff, uint16_t tag, uint8_t tlen, EmvApplication* app) { emv_decode_tlv_tag(const uint8_t* buff, uint16_t tag, uint8_t tlen, EmvApplication* app) {
uint8_t i = 0; uint8_t i = 0;
@@ -406,6 +373,29 @@ static bool emv_decode_response_tlv(const uint8_t* buff, uint8_t len, EmvApplica
return success; return success;
} }
static void emv_prepare_pdol(APDU* dest, APDU* src) {
uint16_t tag = 0;
uint8_t tlen = 0;
uint8_t i = 0;
while(i < src->size) {
bool tag_found = emv_parse_tag(src->data, src->size, &tag, &tlen, &i);
if(tag_found) {
for(uint8_t j = 0; j < COUNT_OF(pdol_values); j++) {
if(tag == pdol_values[j]->tag) {
memcpy(dest->data + dest->size, pdol_values[j]->data, tlen);
dest->size += tlen;
break;
}
}
} else {
// Unknown tag, fill zeros
furi_check(dest->size + tlen < sizeof(dest->data));
memset(dest->data + dest->size, 0, tlen);
dest->size += tlen;
}
}
}
EmvError emv_poller_select_ppse(EmvPoller* instance) { EmvError emv_poller_select_ppse(EmvPoller* instance) {
EmvError error = EmvErrorNone; EmvError error = EmvErrorNone;