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openssl: only verify RSA private key if supported

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In some cases the RSA key does not support verifying it because it's
located on a smart card, an engine wants to hide it, ...
Check the flags on the key before trying to verify it.
OpenSSL does the same thing internally; see ssl/ssl_rsa.c

Closes #1904
This commit is contained in:
Dirk Feytons 2017-09-21 09:57:32 +02:00 committed by Daniel Stenberg
parent 5d916944ae
commit fa9482ab09
No known key found for this signature in database
GPG Key ID: 5CC908FDB71E12C2
1 changed files with 22 additions and 6 deletions
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18
lib/vtls/openssl.c
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@ -549,6 +549,7 @@ int cert_stuff(struct connectdata *conn,
{
struct Curl_easy *data = conn->data;
char error_buffer[256];
bool check_privkey = TRUE;
int file_type = do_file_type(cert_type);
@ -836,12 +837,26 @@ int cert_stuff(struct connectdata *conn,
EVP_PKEY_free(pktmp);
}
#ifndef OPENSSL_NO_RSA
{
/* If RSA is used, don't check the private key if its flags indicate
* it doesn't support it. */
EVP_PKEY *priv_key = SSL_get_privatekey(ssl);
if(EVP_PKEY_id(priv_key) == EVP_PKEY_RSA) {
RSA *rsa = EVP_PKEY_get1_RSA(priv_key);
if(RSA_flags(rsa) & RSA_METHOD_FLAG_NO_CHECK)
check_privkey = FALSE;
RSA_free(rsa); /* Decrement reference count */
}
}
#endif
SSL_free(ssl);
/* If we are using DSA, we can copy the parameters from
* the private key */
if(check_privkey == TRUE) {
/* Now we know that a key and cert have been set against
* the SSL context */
if(!SSL_CTX_check_private_key(ctx)) {
@ -849,6 +864,7 @@ int cert_stuff(struct connectdata *conn,
return 0;
}
}
}
return 1;
}