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#include "sslsock.h"
#include <library/cpp/openssl/init/init.h>
#include <util/datetime/base.h>
#include <util/draft/holder_vector.h>
#include <util/generic/singleton.h>
#include <util/stream/str.h>
#include <util/system/mutex.h>
#include <contrib/libs/openssl/include/openssl/conf.h>
#include <contrib/libs/openssl/include/openssl/crypto.h>
#include <contrib/libs/openssl/include/openssl/err.h>
#include <contrib/libs/openssl/include/openssl/x509v3.h>
#include <contrib/libs/libc_compat/string.h>
namespace NHttpFetcher {
namespace {
struct TSslInit {
inline TSslInit() {
InitOpenSSL();
}
} SSL_INIT;
}
TString TSslSocketBase::GetSslErrors() {
TStringStream ss;
unsigned long err = 0;
while (err = ERR_get_error()) {
if (ss.Str().size()) {
ss << "\n";
}
ss << ERR_error_string(err, nullptr);
}
return ss.Str();
}
class TSslSocketBase::TSslCtx {
public:
SSL_CTX* Ctx;
TSslCtx() {
const SSL_METHOD* method = SSLv23_method();
if (!method) {
TString err = GetSslErrors();
Y_FAIL("SslSocket StaticInit: SSLv23_method failed: %s", err.data());
}
Ctx = SSL_CTX_new(method);
if (!Ctx) {
TString err = GetSslErrors();
Y_FAIL("SSL_CTX_new: %s", err.data());
}
SSL_CTX_set_options(Ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_COMPRESSION);
SSL_CTX_set_verify(Ctx, SSL_VERIFY_NONE, nullptr);
}
~TSslCtx() {
SSL_CTX_free(Ctx);
}
};
SSL_CTX* TSslSocketBase::SslCtx() {
return Singleton<TSslCtx>()->Ctx;
}
void TSslSocketBase::LoadCaCerts(const TString& caFile, const TString& caPath) {
if (1 != SSL_CTX_load_verify_locations(SslCtx(),
!!caFile ? caFile.data() : nullptr,
!!caPath ? caPath.data() : nullptr))
{
ythrow yexception() << "Error loading CA certs: " << GetSslErrors();
}
SSL_CTX_set_verify(SslCtx(), SSL_VERIFY_PEER, nullptr);
}
namespace {
enum EMatchResult {
MATCH_FOUND,
NO_MATCH,
NO_EXTENSION,
ERROR
};
bool EqualNoCase(TStringBuf a, TStringBuf b) {
return (a.size() == b.size()) && (strncasecmp(a.data(), b.data(), a.size()) == 0);
}
bool MatchDomainName(TStringBuf tmpl, TStringBuf name) {
// match wildcards only in the left-most part
// do not support (optional according to RFC) partial wildcards (ww*.yandex.ru)
// see RFC-6125
TStringBuf tmplRest = tmpl;
TStringBuf tmplFirst = tmplRest.NextTok('.');
if (tmplFirst == "*") {
tmpl = tmplRest;
name.NextTok('.');
}
return EqualNoCase(tmpl, name);
}
EMatchResult MatchCertCommonName(X509* cert, TStringBuf hostname) {
int commonNameLoc = X509_NAME_get_index_by_NID(X509_get_subject_name(cert), NID_commonName, -1);
if (commonNameLoc < 0) {
return ERROR;
}
X509_NAME_ENTRY* commonNameEntry = X509_NAME_get_entry(X509_get_subject_name(cert), commonNameLoc);
if (!commonNameEntry) {
return ERROR;
}
ASN1_STRING* commonNameAsn1 = X509_NAME_ENTRY_get_data(commonNameEntry);
if (!commonNameAsn1) {
return ERROR;
}
TStringBuf commonName((const char*)ASN1_STRING_get0_data(commonNameAsn1), ASN1_STRING_length(commonNameAsn1));
return MatchDomainName(commonName, hostname)
? MATCH_FOUND
: NO_MATCH;
}
EMatchResult MatchCertAltNames(X509* cert, TStringBuf hostname) {
EMatchResult result = NO_MATCH;
STACK_OF(GENERAL_NAME)* names = (STACK_OF(GENERAL_NAME)*)X509_get_ext_d2i(cert, NID_subject_alt_name, nullptr, NULL);
if (!names) {
return NO_EXTENSION;
}
int namesCt = sk_GENERAL_NAME_num(names);
for (int i = 0; i < namesCt; ++i) {
const GENERAL_NAME* name = sk_GENERAL_NAME_value(names, i);
if (name->type == GEN_DNS) {
TStringBuf dnsName((const char*)ASN1_STRING_get0_data(name->d.dNSName), ASN1_STRING_length(name->d.dNSName));
if (MatchDomainName(dnsName, hostname)) {
result = MATCH_FOUND;
break;
}
}
}
sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
return result;
}
}
bool TSslSocketBase::CheckCertHostname(X509* cert, TStringBuf hostname) {
switch (MatchCertAltNames(cert, hostname)) {
case MATCH_FOUND:
return true;
break;
case NO_EXTENSION:
return MatchCertCommonName(cert, hostname) == MATCH_FOUND;
break;
default:
return false;
}
}
}
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