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[net] Check i2p private key constraints

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Co-authored-by: Vasil Dimov <vd@FreeBSD.org>

GitHub-Pull: #28695
Rebased-From: cf70a8d565
This commit is contained in:
dergoegge 2023-10-26 16:50:02 +01:00 committed by fanquake
parent 6544ffa01f
commit 1f11784aac
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GPG key ID: 2EEB9F5CC09526C1
1 changed files with 15 additions and 0 deletions
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15
src/i2p.cpp
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@ -384,11 +384,26 @@ Binary Session::MyDestination() const
static constexpr size_t CERT_LEN_POS = 385;
uint16_t cert_len;
if (m_private_key.size() < CERT_LEN_POS + sizeof(cert_len)) {
throw std::runtime_error(strprintf("The private key is too short (%d < %d)",
m_private_key.size(),
CERT_LEN_POS + sizeof(cert_len)));
}
memcpy(&cert_len, &m_private_key.at(CERT_LEN_POS), sizeof(cert_len));
cert_len = be16toh(cert_len);
const size_t dest_len = DEST_LEN_BASE + cert_len;
if (dest_len > m_private_key.size()) {
throw std::runtime_error(strprintf("Certificate length (%d) designates that the private key should "
"be %d bytes, but it is only %d bytes",
cert_len,
dest_len,
m_private_key.size()));
}
return Binary{m_private_key.begin(), m_private_key.begin() + dest_len};
}