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Extend FIDO2 BLE support also for Linux
For Windows it was already added via gh#336, so let's also add it for Linux. Unpaired devices are ignored, the user has to pair independently of libfido use using the bluetooth manager provided by the desktop environment.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| #include "fido.h" | ||
| #include "fido/param.h" | ||
|
|
||
| #define CTAPBLE_PING 0x81 | ||
| #define CTAPBLE_KEEPALIVE 0x82 | ||
| #define CTAPBLE_MSG 0x83 | ||
| #define CTAPBLE_CANCEL 0xBE | ||
| #define CTAPBLE_ERROR 0xBF | ||
|
|
||
| static int | ||
| fido_bluetooth_fragment_tx(fido_dev_t *d, uint8_t cmd, const u_char *buf, size_t count) | ||
| { | ||
| size_t fragment_len = fido_bluetooth_get_cp_size(d); | ||
| u_char *frag_buf; | ||
| size_t payload; | ||
| uint8_t seqnum; | ||
|
|
||
| if (fragment_len <= 3) | ||
| return -1; | ||
|
|
||
| payload = fragment_len - 3; | ||
| frag_buf = calloc(1, fragment_len); | ||
| if (!frag_buf) | ||
| return -1; | ||
|
|
||
| frag_buf[0] = cmd; | ||
| frag_buf[1] = (count >> 8) & 0xff; | ||
| frag_buf[2] = count & 0xff; | ||
| if (payload > count) | ||
| payload = count; | ||
|
|
||
| memcpy(frag_buf + 3, buf, payload); | ||
| d->io.write(d->io_handle, frag_buf, payload + 3); | ||
|
|
||
| count -= payload; | ||
| seqnum = 0; | ||
| buf += payload; | ||
| while (count > 0) { | ||
| payload = fragment_len - 1; | ||
| if (payload > count) | ||
| payload = count; | ||
|
|
||
| memcpy(frag_buf + 1, buf, payload); | ||
| frag_buf[0] = seqnum; | ||
| if (d->io.write(d->io_handle, frag_buf, payload + 1) < 0) | ||
| break; | ||
|
|
||
| count -= payload; | ||
| buf += payload; | ||
| seqnum++; | ||
| seqnum &= 0x7F; | ||
| } | ||
|
|
||
| free(frag_buf); | ||
|
|
||
| if (count > 0) | ||
| return -1; | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| int | ||
| fido_bluetooth_tx(fido_dev_t *d, uint8_t cmd, const u_char *buf, size_t count) | ||
| { | ||
| switch(cmd) { | ||
| case CTAP_CMD_INIT: | ||
| return FIDO_OK; | ||
| case CTAP_CMD_CBOR: | ||
| case CTAP_CMD_MSG: | ||
| return fido_bluetooth_fragment_tx(d, CTAPBLE_MSG, buf, count); | ||
| break; | ||
| } | ||
| if (cmd == CTAP_CMD_INIT) | ||
| return FIDO_OK; | ||
|
|
||
|
|
||
| return FIDO_ERR_INTERNAL; | ||
| } | ||
|
|
||
| static int | ||
| rx_init(fido_dev_t *d, unsigned char *buf, size_t count, int ms) | ||
| { | ||
| (void)ms; | ||
| fido_ctap_info_t *attr = (fido_ctap_info_t *)buf; | ||
| if (count != sizeof(*attr)) { | ||
| fido_log_debug("%s: count=%zu", __func__, count); | ||
| return -1; | ||
| } | ||
|
|
||
| memset(attr, 0, sizeof(*attr)); | ||
|
|
||
| /* we allow only FIDO2 devices for now for simplicity */ | ||
| attr->flags = FIDO_CAP_CBOR | FIDO_CAP_NMSG; | ||
| memcpy(&attr->nonce, &d->nonce, sizeof(attr->nonce)); | ||
|
|
||
| return (int)count; | ||
| } | ||
|
|
||
| static int | ||
| rx_fragments(fido_dev_t *d, unsigned char *buf, size_t count, int ms) | ||
| { | ||
| size_t fragment_len = fido_bluetooth_get_cp_size(d); | ||
| uint8_t *reply; | ||
| uint8_t seq; | ||
| size_t payload; | ||
| size_t reply_length; | ||
| int ret; | ||
| if (fragment_len <= 3) { | ||
| return -1; | ||
| } | ||
| reply = calloc(1, fragment_len); | ||
| payload = fragment_len - 3; | ||
| if (count < payload) | ||
| payload = count; | ||
|
|
||
| do { | ||
| ret = d->io.read(d->io_handle, reply, payload + 3, ms); | ||
| if (ret <= 0) | ||
| goto out; | ||
| } while (reply[0] == CTAPBLE_KEEPALIVE); | ||
|
|
||
| if ((reply[0] != CTAPBLE_MSG) || (ret <= 3)) { | ||
| ret = -1; | ||
| goto out; | ||
| } | ||
| ret -= 3; | ||
|
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||
| reply_length = ((size_t)reply[1]) << 8 | reply[2]; | ||
| if (reply_length > count) | ||
| reply_length = count; | ||
|
|
||
| if (reply_length < count) | ||
| count = reply_length; | ||
|
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||
| memcpy(buf, reply + 3, (size_t)ret); | ||
| count -= (size_t)ret; | ||
| buf += ret; | ||
| seq = 0; | ||
|
|
||
| while(count > 0) { | ||
| payload = fragment_len - 1; | ||
| if (count < payload) | ||
| payload = count; | ||
|
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||
| ret = d->io.read(d->io_handle, reply, payload + 1, ms); | ||
| if (ret <= 1) { | ||
| if (ret >= 0) | ||
| ret = -1; | ||
| goto out; | ||
| } | ||
| ret--; | ||
| if (reply[0] != seq) { | ||
| ret = -1; | ||
| goto out; | ||
| } | ||
| memcpy(buf, reply + 1, (size_t) ret); | ||
|
|
||
| seq++; | ||
| count -= (size_t) ret; | ||
| buf += ret; | ||
| } | ||
| ret = (int)reply_length; | ||
| out: | ||
| explicit_bzero(reply, fragment_len); | ||
| free(reply); | ||
| return ret; | ||
| } | ||
|
|
||
| int | ||
| fido_bluetooth_rx(fido_dev_t *d, uint8_t cmd, u_char *buf, size_t count, int ms) | ||
| { | ||
| switch(cmd) { | ||
| case CTAP_CMD_INIT: | ||
| return rx_init(d, buf, count, ms); | ||
| case CTAP_CMD_CBOR: | ||
| return rx_fragments(d, buf, count, ms); | ||
| default: | ||
| return FIDO_ERR_INTERNAL; | ||
| } | ||
| } | ||
|
|
||
| bool | ||
| fido_is_bluetooth(const char *path) | ||
| { | ||
| return !strncmp(path, FIDO_BLUETOOTH_PREFIX, strlen(FIDO_BLUETOOTH_PREFIX)); | ||
| } | ||
|
|
||
| int | ||
| fido_dev_set_bluetooth(fido_dev_t *d) | ||
| { | ||
| if (d->io_handle != NULL) { | ||
| fido_log_debug("%s: device open", __func__); | ||
| return -1; | ||
| } | ||
| d->io_own = true; | ||
| d->io = (fido_dev_io_t) { | ||
| fido_bluetooth_open, | ||
| fido_bluetooth_close, | ||
| fido_bluetooth_read, | ||
| fido_bluetooth_write, | ||
| }; | ||
| d->transport = (fido_dev_transport_t) { | ||
| fido_bluetooth_rx, | ||
| fido_bluetooth_tx, | ||
| }; | ||
|
|
||
| return 0; | ||
| } | ||
|
|
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