* Wiki: USB NFC Reader
This commit is contained in:
Pavel Zhovner 2020-09-16 15:54:00 +03:00 committed by GitHub
parent dd091e43ab
commit cc4850f738
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 122 additions and 11 deletions

5
.gitignore vendored
View File

@ -1,4 +1,7 @@
.idea/
target_lo/build/
target_*/build/
bindings/
bindings/
# Visual Studio Code
.vscode/

View File

@ -1,22 +1,115 @@
The NFC standard (ISO-14443) operates at 13.56MHz. We are going to use the ST25R3916 chip, the same chip as used in the HydraNFC project.
# NFC
Supported cards:
## Card detector
* ISO-14443 tag (mifare?) reading & writing & emulation
* Emulation — Mifare Classic & Ultralight
![](./../../wiki_static/NFC/nfc-card-detector.png)
Card type is often unknown. Card detector runs tests against the unknown card to determine it's type. These tests are not 100% accurate, but they help to start exploring. If the test finished successfully, it can recommend to run a suitable application for the card type.
### Card detector routine:
1. Check if card `ISO-14443` `A` or `B` or `FeliCa`
2. Check the 6 byte of `SAK` to determine if `ISO-14443-4` compliant
3. Match combination of UID, SAK, ATQA, ATS, ATR from database
4. Try to authenticate as Mifare, EMV, etc..
5. Return founded type and suggest suitable application or return error
## Reader detector
![](./../../wiki_static/NFC/nfc-wall-reader.png)
Wall readers usually looks the same, but may accept various types type of cards. With reader detector feature we can emulate dummy card on Flipper and sniff commands that reader send to card.
### Reader detector
1. Silently read WUPA (0x52) or REQA (0x26) without triggering SELECT on reader
2. Emulate dummy card
2.1 Answer on ATQA
2.2 Answer on SELECT
2.3 ...
3. Consistently emulate popular cards before valid authentication from reader found
## Reader mode
* Mifare classic reader _How to select dictionary?_
* Brute force
* Save dump
* Write dump to SD-card
* Mifare Ultralight reader
* Save dump
* Write dump?
* EMV reader
* Simple UID reader
## Write mode
## Write/Emulate mode
Saved dumps stored on SD-card and accessible from `Saved dumps` menu. All saved dumps can be emulated or written to card if possible. User can view dump info and choose the action:
* Emulate
* Write
* Edit? _(Editing big dumps can be can be difficult)_
# USB NFC Reader [Not implemented]
<img width="800" src="./../../wiki_static/NFC/usb-nfc-reader.png" />
There are many use cases that impossible to run directly on Flipper Zero. Most of these cases require powerful CPU for cryptographic attacks:
- Mifare classic attacks: `mfoc` (Nested), `mfcuk` (Dark Side)
- Mifare Plus attack: Hard Nested
We can use Flipper Zero as a regular USB NFC adapter along with `LibNFC` library, so all existing software will work out of the box without any modifications. This mode must be run from menu `NFC -> USB NFC adapter`. In this mode all commands from PC should be forwarded directly to NFC chip `ST25R3916` via USB serial interface.
# Schematic
![](./../../wiki_static/NFC/ST25R3916-schematic.png)
## Emulate mode
# Menu
![](./../../wiki_static/NFC/nfc-ui.png)
<!--- Menu structure -->
# NFC
# UI
## Detect card
### NFC
* Reader
* Emaulte
- Activating RF field and wait for card.
Run tests when card found.
- Found match
- Mifare Classic found.
Run Mifare reader?
- No found
- Cannot detect card type
## Reader detector
- Passive listen for WUPA/REQA-B
- Commands live stream
0x26
0x26
0x26
- Start active emulating
- .
- Mifare reader found
- .
- EMV reader found
## Read card
- Mifare Classic
- Mifare Ultralight
- EMV get PAN
- what more?
## Saved dumps
- mfc_a6b804bf
- home
- mfu_04bfac72
- emv_paywave_1007
## USB NFC Reader
- Activates instantly.
No more display updates
<!--- Menu structure end -->

View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:cf3b36cb3db6c3552d241e7639f3a2b6858979f00ad8fda25bf7bfaa65bf317d
size 537771

View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:2af09e099308abf2d61ea0d3dc4326d30a2134c9b87b4aeb4678eadac96d17b5
size 46060

View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:35627515ecf8e96d5d28b5469fdf569b993981cda1240b921ca62f997e6ec099
size 338558

View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:8764367c15252a9ff37514451af086a6c4d0adca7ec5b423643b730151388d53
size 88079

View File

@ -0,0 +1,3 @@
version https://git-lfs.github.com/spec/v1
oid sha256:370ec74cbd8e37a5760ed03f19cf31bd135f021a88c4669a68f0705e7ecf0902
size 95362