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OpenSSL: Force RSA 3072-bit key size limit for Suite B

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Reject a peer certificate chain if it includes an RSA public key that
does not use sufficient key length to meet the Suite B 192-bit level
requirement (<= 3k (3072) bits).

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2017-09-17 19:05:19 +03:00 committed by Jouni Malinen
parent 6418400db9
commit 4eb8cfe06b
2 changed files with 41 additions and 0 deletions
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1
src/crypto/tls.h
View file

@ -41,6 +41,7 @@ enum tls_fail_reason {
TLS_FAIL_SERVER_CHAIN_PROBE = 8,
TLS_FAIL_DOMAIN_SUFFIX_MISMATCH = 9,
TLS_FAIL_DOMAIN_MISMATCH = 10,
TLS_FAIL_INSUFFICIENT_KEY_LEN = 11,
};

40
src/crypto/tls_openssl.c
View file

@ -103,6 +103,15 @@ static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
#endif
#if OPENSSL_VERSION_NUMBER < 0x10100000L
#ifdef CONFIG_SUITEB
static int RSA_bits(const RSA *r)
{
return BN_num_bits(r->n);
}
#endif /* CONFIG_SUITEB */
#endif
#ifdef ANDROID
#include <openssl/pem.h>
#include <keystore/keystore_get.h>
@ -1924,6 +1933,37 @@ static int tls_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
TLS_FAIL_SERVER_CHAIN_PROBE);
}
#ifdef CONFIG_SUITEB
if (conn->flags & TLS_CONN_SUITEB) {
EVP_PKEY *pk;
RSA *rsa;
int len = -1;
pk = X509_get_pubkey(err_cert);
if (pk) {
rsa = EVP_PKEY_get1_RSA(pk);
if (rsa) {
len = RSA_bits(rsa);
RSA_free(rsa);
}
EVP_PKEY_free(pk);
}
if (len >= 0) {
wpa_printf(MSG_DEBUG,
"OpenSSL: RSA modulus size: %d bits", len);
if (len < 3072) {
preverify_ok = 0;
openssl_tls_fail_event(
conn, err_cert, err,
depth, buf,
"Insufficient RSA modulus size",
TLS_FAIL_INSUFFICIENT_KEY_LEN);
}
}
}
#endif /* CONFIG_SUITEB */
#ifdef OPENSSL_IS_BORINGSSL
if (depth == 0 && (conn->flags & TLS_CONN_REQUEST_OCSP) &&
preverify_ok) {