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src: use std::unique_ptr for STACK_OF(X509)
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Convert manual memory management of STACK_OF(X509) instances to
std::unique_ptr with a custom deleter.

Note the tasteful application of std::move() to indicate a function
that consumes its argument.

PR-URL: #19087
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
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@bnoordhuis @MylesBorins
bnoordhuis authored and MylesBorins committed Mar 6, 2018
1 parent c1b3a15 commit 8116019
Showing 1 changed file with 44 additions and 54 deletions.
98 changes: 44 additions & 54 deletions src/node_crypto.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -43,12 +43,14 @@
// StartComAndWoSignData.inc
#include "StartComAndWoSignData.inc"

#include <algorithm>
#include <errno.h>
#include <limits.h> // INT_MAX
#include <math.h>
#include <stdlib.h>
#include <string.h>

#include <algorithm>
#include <memory>
#include <vector>

#define THROW_AND_RETURN_IF_NOT_STRING_OR_BUFFER(val, prefix) \
Expand Down Expand Up @@ -115,6 +117,12 @@ using v8::String;
using v8::Value;


struct StackOfX509Deleter {
void operator()(STACK_OF(X509)* p) const { sk_X509_pop_free(p, X509_free); }
};

using StackOfX509 = std::unique_ptr<STACK_OF(X509), StackOfX509Deleter>;

#if OPENSSL_VERSION_NUMBER < 0x10100000L
static void RSA_get0_key(const RSA* r, const BIGNUM** n, const BIGNUM** e,
const BIGNUM** d) {
Expand Down Expand Up @@ -839,17 +847,15 @@ int SSL_CTX_use_certificate_chain(SSL_CTX* ctx,
int ret = 0;
unsigned long err = 0; // NOLINT(runtime/int)

// Read extra certs
STACK_OF(X509)* extra_certs = sk_X509_new_null();
if (extra_certs == nullptr) {
StackOfX509 extra_certs(sk_X509_new_null());
if (!extra_certs)
goto done;
}

while ((extra = PEM_read_bio_X509(in,
nullptr,
NoPasswordCallback,
nullptr))) {
if (sk_X509_push(extra_certs, extra))
if (sk_X509_push(extra_certs.get(), extra))
continue;

// Failure, free all certs
Expand All @@ -867,13 +873,11 @@ int SSL_CTX_use_certificate_chain(SSL_CTX* ctx,
goto done;
}

ret = SSL_CTX_use_certificate_chain(ctx, x, extra_certs, cert, issuer);
ret = SSL_CTX_use_certificate_chain(ctx, x, extra_certs.get(), cert, issuer);
if (!ret)
goto done;

done:
if (extra_certs != nullptr)
sk_X509_pop_free(extra_certs, X509_free);
if (extra != nullptr)
X509_free(extra);
if (x != nullptr)
Expand Down Expand Up @@ -2004,14 +2008,14 @@ static Local<Object> X509ToObject(Environment* env, X509* cert) {

static Local<Object> AddIssuerChainToObject(X509** cert,
Local<Object> object,
STACK_OF(X509)* const peer_certs,
StackOfX509 peer_certs,
Environment* const env) {
Local<Context> context = env->isolate()->GetCurrentContext();
*cert = sk_X509_delete(peer_certs, 0);
*cert = sk_X509_delete(peer_certs.get(), 0);
for (;;) {
int i;
for (i = 0; i < sk_X509_num(peer_certs); i++) {
X509* ca = sk_X509_value(peer_certs, i);
for (i = 0; i < sk_X509_num(peer_certs.get()); i++) {
X509* ca = sk_X509_value(peer_certs.get(), i);
if (X509_check_issued(ca, *cert) != X509_V_OK)
continue;

Expand All @@ -2023,41 +2027,31 @@ static Local<Object> AddIssuerChainToObject(X509** cert,
X509_free(*cert);

// Delete cert and continue aggregating issuers.
*cert = sk_X509_delete(peer_certs, i);
*cert = sk_X509_delete(peer_certs.get(), i);
break;
}

// Issuer not found, break out of the loop.
if (i == sk_X509_num(peer_certs))
if (i == sk_X509_num(peer_certs.get()))
break;
}
sk_X509_pop_free(peer_certs, X509_free);
return object;
}


static bool CloneSSLCerts(X509** cert,
const STACK_OF(X509)* const ssl_certs,
STACK_OF(X509)** peer_certs) {
*peer_certs = sk_X509_new(nullptr);
bool result = true;
static StackOfX509 CloneSSLCerts(X509** cert,
const STACK_OF(X509)* const ssl_certs) {
StackOfX509 peer_certs(sk_X509_new(nullptr));
if (*cert != nullptr)
sk_X509_push(*peer_certs, *cert);
sk_X509_push(peer_certs.get(), *cert);
for (int i = 0; i < sk_X509_num(ssl_certs); i++) {
*cert = X509_dup(sk_X509_value(ssl_certs, i));
if (*cert == nullptr) {
result = false;
break;
}
if (!sk_X509_push(*peer_certs, *cert)) {
result = false;
break;
}
}
if (!result) {
sk_X509_pop_free(*peer_certs, X509_free);
if (*cert == nullptr)
return StackOfX509();
if (!sk_X509_push(peer_certs.get(), *cert))
return StackOfX509();
}
return result;
return peer_certs;
}


Expand Down Expand Up @@ -2091,7 +2085,6 @@ void SSLWrap<Base>::GetPeerCertificate(
Base* w;
ASSIGN_OR_RETURN_UNWRAP(&w, args.Holder());
Environment* env = w->ssl_env();
Local<Context> context = env->context();

ClearErrorOnReturn clear_error_on_return;

Expand All @@ -2103,23 +2096,25 @@ void SSLWrap<Base>::GetPeerCertificate(
// contains the `peer_certificate`, but on server it doesn't.
X509* cert = w->is_server() ? SSL_get_peer_certificate(w->ssl_) : nullptr;
STACK_OF(X509)* ssl_certs = SSL_get_peer_cert_chain(w->ssl_);
STACK_OF(X509)* peer_certs = nullptr;
if (cert == nullptr && (ssl_certs == nullptr || sk_X509_num(ssl_certs) == 0))
goto done;

// Short result requested.
if (args.Length() < 1 || !args[0]->IsTrue()) {
result = X509ToObject(env,
cert == nullptr ? sk_X509_value(ssl_certs, 0) : cert);
X509* target_cert = cert;
if (target_cert == nullptr)
target_cert = sk_X509_value(ssl_certs, 0);
result = X509ToObject(env, target_cert);
goto done;
}

if (CloneSSLCerts(&cert, ssl_certs, &peer_certs)) {
if (auto peer_certs = CloneSSLCerts(&cert, ssl_certs)) {
// First and main certificate.
cert = sk_X509_value(peer_certs, 0);
cert = sk_X509_value(peer_certs.get(), 0);
result = X509ToObject(env, cert);

issuer_chain = AddIssuerChainToObject(&cert, result, peer_certs, env);
issuer_chain =
AddIssuerChainToObject(&cert, result, std::move(peer_certs), env);
issuer_chain = GetLastIssuedCert(&cert, w->ssl_, issuer_chain, env);
// Last certificate should be self-signed.
if (X509_check_issued(cert, cert) == X509_V_OK)
Expand Down Expand Up @@ -3184,25 +3179,23 @@ inline CheckResult CheckWhitelistedServerCert(X509_STORE_CTX* ctx) {
unsigned char hash[CNNIC_WHITELIST_HASH_LEN];
unsigned int hashlen = CNNIC_WHITELIST_HASH_LEN;

STACK_OF(X509)* chain = X509_STORE_CTX_get1_chain(ctx);
CHECK_NE(chain, nullptr);
CHECK_GT(sk_X509_num(chain), 0);
StackOfX509 chain(X509_STORE_CTX_get1_chain(ctx));
CHECK(chain);
CHECK_GT(sk_X509_num(chain.get()), 0);

// Take the last cert as root at the first time.
X509* root_cert = sk_X509_value(chain, sk_X509_num(chain)-1);
X509* root_cert = sk_X509_value(chain.get(), sk_X509_num(chain.get())-1);
X509_NAME* root_name = X509_get_subject_name(root_cert);

if (!IsSelfSigned(root_cert)) {
root_cert = FindRoot(chain);
root_cert = FindRoot(chain.get());
CHECK_NE(root_cert, nullptr);
root_name = X509_get_subject_name(root_cert);
}

X509* leaf_cert = sk_X509_value(chain, 0);
if (!CheckStartComOrWoSign(root_name, leaf_cert)) {
sk_X509_pop_free(chain, X509_free);
X509* leaf_cert = sk_X509_value(chain.get(), 0);
if (!CheckStartComOrWoSign(root_name, leaf_cert))
return CHECK_CERT_REVOKED;
}

// When the cert is issued from either CNNNIC ROOT CA or CNNNIC EV
// ROOT CA, check a hash of its leaf cert if it is in the whitelist.
Expand All @@ -3215,13 +3208,10 @@ inline CheckResult CheckWhitelistedServerCert(X509_STORE_CTX* ctx) {
void* result = bsearch(hash, WhitelistedCNNICHashes,
arraysize(WhitelistedCNNICHashes),
CNNIC_WHITELIST_HASH_LEN, compar);
if (result == nullptr) {
sk_X509_pop_free(chain, X509_free);
if (result == nullptr)
return CHECK_CERT_REVOKED;
}
}

sk_X509_pop_free(chain, X509_free);
return CHECK_OK;
}

Expand Down

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