更新
[X] 我发现当
TLS::credentials creds
在全局范围内声明时,会发生这种情况,但如果我将其声明在外面则不会出现段错误。我需要它是全局的,因为它有助于缓存证书,并且多个线程可以使用其他线程创建的证书,而不必花费时间创建新证书。
[X] 我进一步将代码从大约200行减少到100行左右
我正在使用Botan创建一个TLS应用程序,但我的应用程序在结束时崩溃并出现段错误。
我尝试使用Valgrind进行调试,但没有任何结果。
以下是来自Valgrind的堆栈跟踪:
==3841967== Invalid write of size 8
==3841967== at 0x4842964: memset (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==3841967== by 0x566A82F: Botan::deallocate_memory(void*, unsigned long, unsigned long) (in /usr/lib/x86_64-linux-gnu/libbotan-2.so.12.12.1)
==3841967== by 0x55E1A4D: ??? (in /usr/lib/x86_64-linux-gnu/libbotan-2.so.12.12.1)
==3841967== by 0x40EC7B: std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (shared_ptr_base.h:155)
==3841967== by 0x40EC29: std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count() (shared_ptr_base.h:730)
==3841967== by 0x41112D: std::__shared_ptr<Botan::RSA_Public_Data const, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr() (shared_ptr_base.h:1169)
==3841967== by 0x411107: std::shared_ptr<Botan::RSA_Public_Data const>::~shared_ptr() (shared_ptr.h:103)
==3841967== by 0x41109D: Botan::RSA_PublicKey::~RSA_PublicKey() (rsa.h:25)
==3841967== by 0x410FC1: Botan::RSA_PrivateKey::~RSA_PrivateKey() (rsa.h:92)
==3841967== by 0x410DC5: Botan::RSA_PrivateKey::~RSA_PrivateKey() (rsa.h:92)
==3841967== by 0x410E8A: std::_Sp_counted_ptr<Botan::RSA_PrivateKey*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() (shared_ptr_base.h:377)
==3841967== by 0x40EC7B: std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (shared_ptr_base.h:155)
==3841967== Address 0x9419080 is not stack'd, malloc'd or (recently) free'd
==3841967==
==3841967==
==3841967== Process terminating with default action of signal 11 (SIGSEGV)
==3841967== Access not within mapped region at address 0x9419080
==3841967== at 0x4842964: memset (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==3841967== by 0x566A82F: Botan::deallocate_memory(void*, unsigned long, unsigned long) (in /usr/lib/x86_64-linux-gnu/libbotan-2.so.12.12.1)
==3841967== by 0x55E1A4D: ??? (in /usr/lib/x86_64-linux-gnu/libbotan-2.so.12.12.1)
==3841967== by 0x40EC7B: std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (shared_ptr_base.h:155)
==3841967== by 0x40EC29: std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count() (shared_ptr_base.h:730)
==3841967== by 0x41112D: std::__shared_ptr<Botan::RSA_Public_Data const, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr() (shared_ptr_base.h:1169)
==3841967== by 0x411107: std::shared_ptr<Botan::RSA_Public_Data const>::~shared_ptr() (shared_ptr.h:103)
==3841967== by 0x41109D: Botan::RSA_PublicKey::~RSA_PublicKey() (rsa.h:25)
==3841967== by 0x410FC1: Botan::RSA_PrivateKey::~RSA_PrivateKey() (rsa.h:92)
==3841967== by 0x410DC5: Botan::RSA_PrivateKey::~RSA_PrivateKey() (rsa.h:92)
==3841967== by 0x410E8A: std::_Sp_counted_ptr<Botan::RSA_PrivateKey*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() (shared_ptr_base.h:377)
==3841967== by 0x40EC7B: std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (shared_ptr_base.h:155)
==3841967== If you believe this happened as a result of a stack
==3841967== overflow in your program's main thread (unlikely but
==3841967== possible), you can try to increase the size of the
==3841967== main thread stack using the --main-stacksize= flag.
==3841967== The main thread stack size used in this run was 8388608.
==3841967==
==3841967== HEAP SUMMARY:
==3841967== in use at exit: 149,626 bytes in 1,143 blocks
==3841967== total heap usage: 211,782 allocs, 210,639 frees, 90,582,963 bytes allocated
==3841967==
==3841967== LEAK SUMMARY:
==3841967== definitely lost: 0 bytes in 0 blocks
==3841967== indirectly lost: 0 bytes in 0 blocks
==3841967== possibly lost: 1,352 bytes in 18 blocks
==3841967== still reachable: 148,274 bytes in 1,125 blocks
==3841967== of which reachable via heuristic:
==3841967== newarray : 1,536 bytes in 16 blocks
==3841967== suppressed: 0 bytes in 0 blocks
==3841967== Rerun with --leak-check=full to see details of leaked memory
==3841967==
==3841967== For lists of detected and suppressed errors, rerun with: -s
==3841967== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)
您可以通过以下命令将Botan克隆到您的计算机中:
git clone https://github.com/randombit/botan.git
请按照官方网站的说明进行构建和安装。
您需要在计算机上安装OpenSSL,以创建用于该应用程序的根证书颁发机构。
创建名为testApplication
的文件夹并进入其中。
然后使用Bash,输入以下一系列命令来创建根CA:
# Generate private key
openssl genrsa -des3 -out myCA.key 2048
# Generate root certificate
openssl req -x509 -new -nodes -key myCA.key -sha256 -days 825 -out myCA.pem
# Convert to Botan Format
openssl pkcs8 -topk8 -in myCA.key > myCAKey.pkcs8.pem
请使用thisispassword
作为密码。
在您的计算机上安装clang编译器,然后可以按照以下方式编译源文件:
clang++ example.cpp -o example -Wthread-safety -Wall -Wextra -g -std=c++17 -pthread -lssl -lcrypto -lbotan-2 --I/usr/include/botan-2
示例.cpp
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream>
#include <botan/tls_server.h>
#include <botan/tls_callbacks.h>
#include <botan/tls_session_manager.h>
#include <botan/tls_policy.h>
#include <botan/auto_rng.h>
#include <botan/certstor.h>
#include <botan/pk_keys.h>
#include <botan/pkcs10.h>
#include <botan/pkcs8.h>
#include <botan/x509self.h>
#include <botan/x509path.h>
#include <botan/x509_ca.h>
#include <botan/x509_ext.h>
#include <botan/pk_algs.h>
#include <botan/ber_dec.h>
#include <botan/der_enc.h>
#include <botan/oids.h>
#include <botan/rsa.h>
namespace TLS
{
typedef std::chrono::duration<int, std::ratio<31556926>> years;
class credentials : public Botan::Credentials_Manager
{
private:
struct certificate
{
std::vector<Botan::X509_Certificate> certs;
std::shared_ptr<Botan::Private_Key> key;
};
std::vector<certificate> creds;
std::vector<std::shared_ptr<Botan::Certificate_Store>> store;
public:
void createCert(std::string hostname)
{
/**
* Initialize Root CA
**/
Botan::AutoSeeded_RNG rng;
const Botan::X509_Certificate rootCert("myCA.pem");
std::ifstream rootCertPrivateKeyFile("myCAKey.pkcs8.pem");
Botan::DataSource_Stream rootCertPrivateKeyStream(rootCertPrivateKeyFile);
std::unique_ptr<Botan::Private_Key> rootCertPrivateKey = Botan::PKCS8::load_key(rootCertPrivateKeyStream, "thisispassword");
Botan::X509_CA rootCA(rootCert, *rootCertPrivateKey, "SHA-256", rng);
/**
* Generate a Cert & Sign with Root CA
**/
Botan::X509_Cert_Options opts;
std::shared_ptr<Botan::Private_Key> serverPrivateKeyShared(new Botan::RSA_PrivateKey(rng, 4096));
Botan::RSA_PrivateKey* serverPrivateKey = (Botan::RSA_PrivateKey*)serverPrivateKeyShared.get();
opts.common_name = hostname;
opts.country = "US";
auto now = std::chrono::system_clock::now();
Botan::X509_Time todayDate(now);
Botan::X509_Time expireDate(now + years(1));
Botan::PKCS10_Request req = Botan::X509::create_cert_req(opts, *serverPrivateKey, "SHA-256", rng);
auto serverCert = rootCA.sign_request(req, rng, todayDate, expireDate);
/**
* Load Cert to In-Memory Database
**/
certificate cert;
cert.certs.push_back(serverCert);
cert.key = serverPrivateKeyShared;
creds.push_back(cert);
}
};
}; // namespace TLS
TLS::credentials globalCreds;
int main() {
globalCreds.createCert("www.google.com");
std::cout << "End" << "\n";
return 0;
}
这是来自Botan Lib的函数,Valgrind在此引用:
void deallocate_memory(void* p, size_t elems, size_t elem_size)
{
if(p == nullptr)
return;
secure_scrub_memory(p, elems * elem_size);
#if defined(BOTAN_HAS_LOCKING_ALLOCATOR)
if(mlock_allocator::instance().deallocate(p, elems, elem_size))
return;
#endif
std::free(p);
}
globalCreds
并将其隐藏在一个“getter”函数中(TLS::credentials &globalCreds() { static TLS::credentials creds; return creds; }
),以确保它在需要它的某些库组件被销毁之前被销毁。 - 1201ProgramAlarm