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Add unencrypted payloads

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This commit is contained in:
Steve Gilberd 2025-10-26 15:52:46 +13:00
parent 13c4c2037d
commit d46f7b66ba
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GPG Key ID: 3CA3675E3C90637F
3 changed files with 75 additions and 54 deletions
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28
src/mesh/Router.cpp
View File

@ -23,6 +23,8 @@
#include "serialization/MeshPacketSerializer.h"
#endif
#define UNENCRYPTED_MAGIC 0x55 // Magic number to verify that an unencrypted protobuf decode is actually supposed to be such
#define MAX_RX_FROMRADIO \
4 // max number of packets destined to our queue, we dispatch packets quickly so it doesn't need to be big
@ -425,6 +427,16 @@ DecodeState perhapsDecode(meshtastic_MeshPacket *p)
}
bool decrypted = false;
ChannelIndex chIndex = 0;
// Attempt unencrypted decode
meshtastic_Data decodedtmp{};
if (pb_decode_from_bytes(p->encrypted.bytes, rawSize, meshtastic_Data_fields, &decodedtmp, true) &&
decodedtmp.tx_unencrypted == UNENCRYPTED_MAGIC) {
p->which_payload_variant = meshtastic_MeshPacket_decoded_tag;
memcpy(&p->decoded, &decodedtmp, sizeof(decodedtmp));
return DecodeState::DECODE_SUCCESS;
}
#if !(MESHTASTIC_EXCLUDE_PKI)
// Attempt PKI decryption first
if (p->channel == 0 && isToUs(p) && p->to > 0 && !isBroadcast(p->to) && nodeDB->getMeshNode(p->from) != nullptr &&
@ -546,6 +558,8 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
p->decoded.bitfield |= (p->decoded.want_response << BITFIELD_WANT_RESPONSE_SHIFT);
}
if (p->decoded.tx_unencrypted)
p->decoded.tx_unencrypted = UNENCRYPTED_MAGIC;
size_t numbytes = pb_encode_to_bytes(bytes, sizeof(bytes), &meshtastic_Data_msg, &p->decoded);
/* Not actually used, so save the cycles
@ -590,11 +604,13 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
ChannelIndex chIndex = p->channel; // keep as a local because we are about to change it
if (p->decoded.tx_unencrypted) {
memcpy(p->encrypted.bytes, bytes, numbytes); // Just copy across with no further action
} else {
#if !(MESHTASTIC_EXCLUDE_PKI)
meshtastic_NodeInfoLite *node = nodeDB->getMeshNode(p->to);
// We may want to retool things so we can send a PKC packet when the client specifies a key and nodenum, even if the node
// is not in the local nodedb
// First, only PKC encrypt packets we are originating
// We may want to retool things so we can send a PKC packet when the client specifies a key and nodenum, even if the
// node is not in the local nodedb First, only PKC encrypt packets we are originating
if (isFromUs(p) &&
#if ARCH_PORTDUINO
// Sim radio via the cli flag skips PKC
@ -610,8 +626,9 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
// Check for a known public key for the destination
(node->user.public_key.size == 32) &&
// Some portnums either make no sense to send with PKC
p->decoded.portnum != meshtastic_PortNum_TRACEROUTE_APP && p->decoded.portnum != meshtastic_PortNum_NODEINFO_APP &&
p->decoded.portnum != meshtastic_PortNum_ROUTING_APP && p->decoded.portnum != meshtastic_PortNum_POSITION_APP) {
p->decoded.portnum != meshtastic_PortNum_TRACEROUTE_APP &&
p->decoded.portnum != meshtastic_PortNum_NODEINFO_APP && p->decoded.portnum != meshtastic_PortNum_ROUTING_APP &&
p->decoded.portnum != meshtastic_PortNum_POSITION_APP) {
LOG_DEBUG("Use PKI!");
if (numbytes + MESHTASTIC_HEADER_LENGTH + MESHTASTIC_PKC_OVERHEAD > MAX_LORA_PAYLOAD_LEN)
return meshtastic_Routing_Error_TOO_LARGE;
@ -657,6 +674,7 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
crypto->encryptPacket(getFrom(p), p->id, numbytes, bytes);
memcpy(p->encrypted.bytes, bytes, numbytes);
#endif
}
// Copy back into the packet and set the variant type
p->encrypted.size = numbytes;

4
src/mesh/mesh-pb-constants.cpp
View File

@ -21,10 +21,12 @@ size_t pb_encode_to_bytes(uint8_t *destbuf, size_t destbufsize, const pb_msgdesc
}
/// helper function for decoding a record as a protobuf, we will return false if the decoding failed
bool pb_decode_from_bytes(const uint8_t *srcbuf, size_t srcbufsize, const pb_msgdesc_t *fields, void *dest_struct)
bool pb_decode_from_bytes(const uint8_t *srcbuf, size_t srcbufsize, const pb_msgdesc_t *fields, void *dest_struct,
bool suppress_errors)
{
pb_istream_t stream = pb_istream_from_buffer(srcbuf, srcbufsize);
if (!pb_decode(&stream, fields, dest_struct)) {
if (!suppress_errors)
LOG_ERROR("Can't decode protobuf reason='%s', pb_msgdesc %p", PB_GET_ERROR(&stream), fields);
return false;
} else {

3
src/mesh/mesh-pb-constants.h
View File

@ -74,7 +74,8 @@ static inline int get_max_num_nodes()
size_t pb_encode_to_bytes(uint8_t *destbuf, size_t destbufsize, const pb_msgdesc_t *fields, const void *src_struct);
/// helper function for decoding a record as a protobuf, we will return false if the decoding failed
bool pb_decode_from_bytes(const uint8_t *srcbuf, size_t srcbufsize, const pb_msgdesc_t *fields, void *dest_struct);
bool pb_decode_from_bytes(const uint8_t *srcbuf, size_t srcbufsize, const pb_msgdesc_t *fields, void *dest_struct,
bool suppress_errors = false);
/// Read from an Arduino File
bool readcb(pb_istream_t *stream, uint8_t *buf, size_t count);