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Fixes for sniffer when using static ECC keys. Adds TLS v1.2 ECC key fallback detection and fixes new ECC RNG requirement for timing resistance.

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This commit is contained in:
David Garske
2020-09-24 15:03:26 -07:00
parent 7cfbc598ed
commit bbaf4090b8
1 changed files with 23 additions and 4 deletions
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27
src/sniffer.c
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@@ -2066,6 +2066,11 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
{
word32 idx = 0;
int ret;
#ifdef HAVE_ECC
int useEccCurveId = ECC_CURVE_DEF;
if (ksInfo && ksInfo->curve_id != 0)
useEccCurveId = ksInfo->curve_id;
#endif
#ifndef NO_RSA
/* Static RSA */
@@ -2085,6 +2090,11 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
SetError(RSA_DECODE_STR, error, session, 0);
#endif
}
#ifdef HAVE_ECC
else {
useEccCurveId = -1; /* don't try loading ECC */
}
#endif
}
if (ret == 0) {
@@ -2135,7 +2145,7 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
#endif /* !NO_RSA */
#if !defined(NO_DH) && defined(WOLFSSL_DH_EXTRA)
/* Static Ephemeral DH Key */
/* Static DH Key */
if (ksInfo && ksInfo->dh_key_bits != 0) {
DhKey dhKey;
const DhParams* params;
@@ -2223,8 +2233,8 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
#endif /* !NO_DH && WOLFSSL_DH_EXTRA */
#ifdef HAVE_ECC
/* Static Ephemeral ECC Key */
if (ksInfo && ksInfo->curve_id != 0) {
/* Static ECC Key */
if (useEccCurveId >= ECC_CURVE_DEF) {
ecc_key key;
ecc_key pubKey;
int length, keyInit = 0, pubKeyInit = 0;
@@ -2235,6 +2245,15 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
keyInit = 1;
ret = wc_ecc_init(&pubKey);
}
#if defined(ECC_TIMING_RESISTANT) && (!defined(HAVE_FIPS) || \
(!defined(HAVE_FIPS_VERSION) || (HAVE_FIPS_VERSION != 2))) && \
!defined(HAVE_SELFTEST)
if (ret == 0) {
ret = wc_ecc_set_rng(&key, session->sslServer->rng);
}
#endif
if (ret == 0) {
pubKeyInit = 1;
ret = wc_EccPrivateKeyDecode(keyBuf->buffer, &idx, &key, keyBuf->length);
@@ -2258,7 +2277,7 @@ static int SetupKeys(const byte* input, int* sslBytes, SnifferSession* session,
}
if (ret == 0) {
ret = wc_ecc_import_x963_ex(input, length, &pubKey, ksInfo->curve_id);
ret = wc_ecc_import_x963_ex(input, length, &pubKey, useEccCurveId);
if (ret != 0) {
SetError(ECC_PUB_DECODE_STR, error, session, FATAL_ERROR_STATE);
}