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added checksum section to short certificate format

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csoler 2019-09-29 17:37:52 +02:00
parent 974102e3fc
commit e41b64d938
No known key found for this signature in database
GPG Key ID: 7BCA522266C0804C
1 changed files with 37 additions and 0 deletions
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37
libretroshare/src/rsserver/p3peers.cc
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@ -1148,6 +1148,7 @@ enum class RsShortInviteFieldType : uint8_t
PEER_NAME = 0x01, PEER_NAME = 0x01,
LOCATOR = 0x02, LOCATOR = 0x02,
PGP_FINGERPRINT = 0x03, PGP_FINGERPRINT = 0x03,
CHECKSUM = 0x04,
/* The following will be deprecated, and ported to LOCATOR when generic /* The following will be deprecated, and ported to LOCATOR when generic
* trasport layer will be implemented */ * trasport layer will be implemented */
@ -1266,6 +1267,17 @@ bool p3Peers::getShortInvite(
offset += tLocator.size(); offset += tLocator.size();
} }
} }
uint32_t computed_crc = PGPKeyManagement::compute24bitsCRC(buf,offset) ;
// handle endian issues.
unsigned char mem[3] ;
mem[0] = computed_crc & 0xff ;
mem[1] = (computed_crc >> 8 ) & 0xff ;
mem[2] = (computed_crc >> 16) & 0xff ;
addPacketHeader( RsShortInviteFieldType::CHECKSUM,3,buf,offset,buf_size);
memcpy(&buf[offset],mem,3);
offset += 3;
Radix64::encode(buf, static_cast<int>(offset), invite); Radix64::encode(buf, static_cast<int>(offset), invite);
@ -1299,6 +1311,7 @@ bool p3Peers::parseShortInvite(const std::string& inviteStrUrl, RsPeerDetails& d
unsigned char* buf = bf.data(); unsigned char* buf = bf.data();
size_t total_s = 0; size_t total_s = 0;
bool CRC_ok = false ; // not checked yet
while(total_s < size) while(total_s < size)
{ {
@ -1373,6 +1386,25 @@ bool p3Peers::parseShortInvite(const std::string& inviteStrUrl, RsPeerDetails& d
details.hiddenNodeAddress = std::string((char*)&buf[6],s-6); details.hiddenNodeAddress = std::string((char*)&buf[6],s-6);
break; break;
case RsShortInviteFieldType::CHECKSUM:
{
if(s != 3 || total_s+3 != size) // make sure the checksum is the last section
{
err_code = CERTIFICATE_PARSING_ERROR_INVALID_CHECKSUM_SECTION;
return false;
}
uint32_t computed_crc = PGPKeyManagement::compute24bitsCRC(bf.data(),size-5);
uint32_t certificate_crc = static_cast<uint32_t>( buf[0] + (buf[1] << 8) + (buf[2] << 16) );
if(computed_crc != certificate_crc)
{
err_code = CERTIFICATE_PARSING_ERROR_CHECKSUM_ERROR;
return false;
}
CRC_ok = true;
break;
}
} }
buf = &buf[s]; buf = &buf[s];
@ -1396,6 +1428,11 @@ bool p3Peers::parseShortInvite(const std::string& inviteStrUrl, RsPeerDetails& d
else else
details.skip_pgp_signature_validation = true; details.skip_pgp_signature_validation = true;
if(!CRC_ok)
{
err_code = CERTIFICATE_PARSING_ERROR_CHECKSUM_ERROR;
return false;
}
if(details.gpg_id.isNull()) if(details.gpg_id.isNull())
{ {
err_code = CERTIFICATE_PARSING_ERROR_MISSING_PGP_FINGERPRINT; err_code = CERTIFICATE_PARSING_ERROR_MISSING_PGP_FINGERPRINT;