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verify extracted public key in wc_PKCS7_InitWithCert

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This commit is contained in:
Chris Conlon
2020-11-13 17:11:47 -07:00
parent d4e1340027
commit c436bc44e6
1 changed files with 111 additions and 0 deletions
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111
wolfcrypt/src/pkcs7.c
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@ -909,6 +909,105 @@ static int wc_PKCS7_RecipientListVersionsAllZero(PKCS7* pkcs7)
return 1;
}
/* Verify RSA/ECC key is correctly formatted, used as sanity check after
* import of key/cert.
*
* keyOID - key OID (ex: RSAk, ECDSAk)
* key - key in DER
* keySz - size of key, octets
*
* Returns 0 on success, negative on error */
static int wc_PKCS7_CheckPublicKeyDer(PKCS7* pkcs7, int keyOID,
const byte* key, word32 keySz)
{
int ret = 0;
word32 scratch = 0;
#ifdef WOLFSSL_SMALL_STACK
#ifndef NO_RSA
RsaKey* rsa;
#endif
#ifdef HAVE_ECC
ecc_key* ecc;
#endif
#else
#ifndef NO_RSA
RsaKey rsa[1];
#endif
#ifdef HAVE_ECC
ecc_key ecc[1];
#endif
#endif
if (pkcs7 == NULL || key == NULL || keySz == 0) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
#ifndef NO_RSA
rsa = (RsaKey*)XMALLOC(sizeof(RsaKey), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (rsa == NULL) {
return MEMORY_E;
}
#endif
#ifdef HAVE_ECC
ecc = (ecc_key*)XMALLOC(sizeof(ecc_key), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (ecc == NULL) {
#ifndef NO_RSA
XFREE(rsa, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return MEMORY_E;
}
#endif
#endif
switch (keyOID) {
#ifndef NO_RSA
case RSAk:
ret = wc_InitRsaKey_ex(rsa, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
break;
}
/* Try to decode public key as sanity check. wc_CheckRsaKey()
only checks private key not public. */
ret = wc_RsaPublicKeyDecode(key, &scratch, rsa, keySz);
wc_FreeRsaKey(rsa);
break;
#endif
#ifdef HAVE_ECC
case ECDSAk:
ret = wc_ecc_init_ex(ecc, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
break;
}
/* Try to decode public key and check with wc_ecc_check_key() */
ret = wc_EccPublicKeyDecode(key, &scratch, ecc, keySz);
if (ret == 0) {
ret = wc_ecc_check_key(ecc);
}
wc_ecc_free(ecc);
break;
#endif
}
#ifdef WOLFSSL_SMALL_STACK
#ifndef NO_RSA
XFREE(rsa, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
#ifdef HAVE_ECC
XFREE(ecc, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
#endif
return ret;
}
/* Init PKCS7 struct with recipient cert, decode into DecodedCert
* NOTE: keeps previously set pkcs7 heap hint, devId and isDynamic */
@ -981,6 +1080,18 @@ int wc_PKCS7_InitWithCert(PKCS7* pkcs7, byte* derCert, word32 derCertSz)
return ret;
}
/* verify extracted public key is valid before storing */
ret = wc_PKCS7_CheckPublicKeyDer(pkcs7, dCert->keyOID,
dCert->publicKey, dCert->pubKeySize);
if (ret != 0) {
WOLFSSL_MSG("Invalid public key, check pkcs7->cert\n");
FreeDecodedCert(dCert);
#ifdef WOLFSSL_SMALL_STACK
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
XMEMCPY(pkcs7->publicKey, dCert->publicKey, dCert->pubKeySize);
pkcs7->publicKeySz = dCert->pubKeySize;
pkcs7->publicKeyOID = dCert->keyOID;