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Fix buffer accessed out of bounds

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Dimitris Apostolou 2025-01-19 18:55:06 +02:00
parent c600b834e3
commit 788a7f234b
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GPG key ID: 4B5D20E938204A8A
1 changed files with 20 additions and 7 deletions
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27
libi2pd/Identity.cpp
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@ -18,20 +18,33 @@ namespace data
{
Identity& Identity::operator=(const Keys& keys)
{
// Ensure the destination buffers are not accessed out of bounds
static_assert(sizeof(publicKey) >= sizeof(keys.publicKey), "publicKey buffer too small");
static_assert(sizeof(signingKey) >= sizeof(keys.signingKey), "signingKey buffer too small");
// copy public and signing keys together
memcpy (publicKey, keys.publicKey, sizeof (publicKey));
memcpy (signingKey, keys.signingKey, sizeof (signingKey));
memset (certificate, 0, sizeof (certificate));
memcpy(publicKey, keys.publicKey, sizeof(keys.publicKey));
memcpy(signingKey, keys.signingKey, sizeof(keys.signingKey));
memset(certificate, 0, sizeof(certificate)); // Clear certificate safely
return *this;
}
size_t Identity::FromBuffer (const uint8_t * buf, size_t len)
size_t Identity::FromBuffer(const uint8_t* buf, size_t len)
{
if ( len < DEFAULT_IDENTITY_SIZE ) {
// buffer too small, don't overflow
if (len < DEFAULT_IDENTITY_SIZE) {
// buffer too small, avoid overflow
LogPrint(eLogError, "Identity::FromBuffer: Buffer too small, expected at least ", DEFAULT_IDENTITY_SIZE, " bytes");
return 0;
}
memcpy (publicKey, buf, DEFAULT_IDENTITY_SIZE);
// Copy only up to the size of publicKey and ensure no overflow occurs
memcpy(publicKey, buf, sizeof(publicKey));
// Log or handle unexpected large buffers
if (len > DEFAULT_IDENTITY_SIZE) {
LogPrint(eLogWarning, "Identity::FromBuffer: Extra data in buffer ignored");
}
return DEFAULT_IDENTITY_SIZE;
}