C++ ERR_get_error函数代码示例

int network_write_chunkqueue_openssl(server *srv, connection *con, SSL *ssl, chunkqueue *cq) {
	int ssl_r;
	chunk *c;
	size_t chunks_written = 0;

	/* this is a 64k sendbuffer
	 *
	 * it has to stay at the same location all the time to satisfy the needs
	 * of SSL_write to pass the SAME parameter in case of a _WANT_WRITE
	 *
	 * the buffer is allocated once, is NOT realloced and is NOT freed at shutdown
	 * -> we expect a 64k block to 'leak' in valgrind
	 *
	 *
	 * In reality we would like to use mmap() but we don't have a guarantee that
	 * we get the same mmap() address for each call. On openbsd the mmap() address
	 * even randomized.
	 *   That means either we keep the mmap() open or we do a read() into a
	 * constant buffer
	 * */
#define LOCAL_SEND_BUFSIZE (64 * 1024)
	static char *local_send_buffer = NULL;

	/* the remote side closed the connection before without shutdown request
	 * - IE
	 * - wget
	 * if keep-alive is disabled */

	if (con->keep_alive == 0) {
		SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
	}

	for(c = cq->first; c; c = c->next) {
		int chunk_finished = 0;

		switch(c->type) {
		case MEM_CHUNK: {
			char * offset;
			size_t toSend;
			ssize_t r;

			if (c->mem->used == 0 || c->mem->used == 1) {
				chunk_finished = 1;
				break;
			}

			offset = c->mem->ptr + c->offset;
			toSend = c->mem->used - 1 - c->offset;

			/**
			 * SSL_write man-page
			 *
			 * WARNING
			 *        When an SSL_write() operation has to be repeated because of
			 *        SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE, it must be
			 *        repeated with the same arguments.
			 *
			 */

			ERR_clear_error();
			if ((r = SSL_write(ssl, offset, toSend)) <= 0) {
				unsigned long err;

				switch ((ssl_r = SSL_get_error(ssl, r))) {
				case SSL_ERROR_WANT_WRITE:
					break;
				case SSL_ERROR_SYSCALL:
					/* perhaps we have error waiting in our error-queue */
					if (0 != (err = ERR_get_error())) {
						do {
							log_error_write(srv, __FILE__, __LINE__, "sdds", "SSL:",
									ssl_r, r,
									ERR_error_string(err, NULL));
						} while((err = ERR_get_error()));
					} else if (r == -1) {
						/* no, but we have errno */
						switch(errno) {
						case EPIPE:
						case ECONNRESET:
							return -2;
						default:
							log_error_write(srv, __FILE__, __LINE__, "sddds", "SSL:",
									ssl_r, r, errno,
									strerror(errno));
							break;
						}
					} else {
						/* neither error-queue nor errno ? */
						log_error_write(srv, __FILE__, __LINE__, "sddds", "SSL (error):",
								ssl_r, r, errno,
								strerror(errno));
					}

					return  -1;
				case SSL_ERROR_ZERO_RETURN:
					/* clean shutdown on the remote side */

					if (r == 0) return -2;

					/* fall through */
//.........这里部分代码省略.........

 bytes public_key::decrypt( const bytes& in )const
 {
    FC_ASSERT( my && my->rsa );
    bytes out( RSA_size(my->rsa) );//, char(0) );
    int rtn = RSA_public_decrypt( in.size(),
                                   (unsigned char*)in.data(),
                                   (unsigned char*)out.data(),
                                   my->rsa, RSA_PKCS1_OAEP_PADDING );
    if( rtn >= 0 ) {
       out.resize(rtn);
       return out;
    }
    FC_THROW_EXCEPTION( exception, "openssl: ${message}", ("message",fc::string(ERR_error_string( ERR_get_error(),NULL))) );
 }

static int
tap11_change_pin(
	const char *p11lib,
	int is_so,
	const char *pin,
	const char *newpin)
{
	int rc = 0;
	unsigned int nslots;

	PKCS11_CTX *p11ctx;
	PKCS11_SLOT *slots, *slot;

	p11ctx = PKCS11_CTX_new();

	/* load pkcs #11 module */
	rc = PKCS11_CTX_load(p11ctx,p11lib);
	if (rc) {
		fprintf(stderr,"PKCS11_CTX_load\n");
		return -1;
	}

	/* get information on all slots */
	rc = PKCS11_enumerate_slots(p11ctx, &slots, &nslots);
	if (rc < 0) {
		fprintf(stderr,"PKCS11_enumerate_slots\n");
		return -1;
	}

	/* get first slot with a token */
	slot = PKCS11_find_token(p11ctx, slots, nslots);
	if (!slot || !slot->token) {
		fprintf(stderr,"PKCS11_find_token\n");
		return -1;
	}

	fprintf(stderr,"Slot manufacturer......: %s\n", slot->manufacturer);
	fprintf(stderr,"Slot description.......: %s\n", slot->description);
	fprintf(stderr,"Slot token label.......: %s\n", slot->token->label);
	fprintf(stderr,"Slot token manufacturer: %s\n", slot->token->manufacturer);
	fprintf(stderr,"Slot token model.......: %s\n", slot->token->model);
	fprintf(stderr,"Slot token serialnr....: %s\n", slot->token->serialnr);

	/* rw mode */
	rc = PKCS11_open_session(slot, 1);
	if (rc != 0) {
		ERR_load_PKCS11_strings();
		fprintf(stderr,"PKCS11_open_session %s\n",
			ERR_reason_error_string(ERR_get_error()));
		return -1;
	}

	rc = PKCS11_login(slot, is_so, pin);
	if (rc != 0) {
		ERR_load_PKCS11_strings();
		fprintf(stderr,"PKCS11_init_login %s\n",
			ERR_reason_error_string(ERR_get_error()));
		return -1;
	}

	rc = PKCS11_change_pin(slot,pin,newpin);
	if (rc != 0) {
		ERR_load_PKCS11_strings();
		fprintf(stderr,"PKCS11_change_pin %s\n",
			ERR_reason_error_string(ERR_get_error()));
		return -1;
	}

	PKCS11_logout(slot);
	PKCS11_release_all_slots(p11ctx, slots, nslots);
	PKCS11_CTX_unload(p11ctx);
	PKCS11_CTX_free(p11ctx);

	fprintf(stderr,"\n\npin change succeed\n");

	return 0;
}

int proxy_tls_recv(rad_listen_t *listener)
{
	int rcode;
	size_t length;
	listen_socket_t *sock = listener->data;
	char buffer[256];
	RADIUS_PACKET *packet;
	uint8_t *data;

	/*
	 *	Get the maximum size of data to receive.
	 */
	if (!sock->data) sock->data = talloc_array(sock, uint8_t,
						   sock->ssn->offset);
	data = sock->data;

	DEBUG3("Proxy SSL socket has data to read");
	PTHREAD_MUTEX_LOCK(&sock->mutex);
redo:
	rcode = SSL_read(sock->ssn->ssl, data, 4);
	if (rcode <= 0) {
		int err = SSL_get_error(sock->ssn->ssl, rcode);
		switch (err) {
		case SSL_ERROR_WANT_READ:
		case SSL_ERROR_WANT_WRITE:
			goto redo;

		case SSL_ERROR_ZERO_RETURN:
			/* remote end sent close_notify, send one back */
			SSL_shutdown(sock->ssn->ssl);

		case SSL_ERROR_SYSCALL:
		do_close:
			PTHREAD_MUTEX_UNLOCK(&sock->mutex);
			tls_socket_close(listener);
			return 0;

		default:
			while ((err = ERR_get_error())) {
				DEBUG("proxy recv says %s",
				      ERR_error_string(err, NULL));
			}
			
			goto do_close;
		}
	}

	length = (data[2] << 8) | data[3];
	DEBUG3("Proxy received header saying we have a packet of %u bytes",
	       (unsigned int) length);

	if (length > sock->ssn->offset) {
		INFO("Received packet will be too large! Set \"fragment_size=%u\"",
		       (data[2] << 8) | data[3]);
		goto do_close;
	}
	
	rcode = SSL_read(sock->ssn->ssl, data + 4, length);
	if (rcode <= 0) {
		switch (SSL_get_error(sock->ssn->ssl, rcode)) {
		case SSL_ERROR_WANT_READ:
		case SSL_ERROR_WANT_WRITE:
			break;

		case SSL_ERROR_ZERO_RETURN:
			/* remote end sent close_notify, send one back */
			SSL_shutdown(sock->ssn->ssl);
			goto do_close;
		default:
			goto do_close;
		}
	}
	PTHREAD_MUTEX_UNLOCK(&sock->mutex);

	packet = rad_alloc(NULL, 0);
	packet->sockfd = listener->fd;
	packet->src_ipaddr = sock->other_ipaddr;
	packet->src_port = sock->other_port;
	packet->dst_ipaddr = sock->my_ipaddr;
	packet->dst_port = sock->my_port;
	packet->code = data[0];
	packet->id = data[1];
	packet->data_len = length;
	packet->data = talloc_array(packet, uint8_t, packet->data_len);
	memcpy(packet->data, data, packet->data_len);
	memcpy(packet->vector, packet->data + 4, 16);

	/*
	 *	FIXME: Client MIB updates?
	 */
	switch(packet->code) {
	case PW_AUTHENTICATION_ACK:
	case PW_ACCESS_CHALLENGE:
	case PW_AUTHENTICATION_REJECT:
		break;

#ifdef WITH_ACCOUNTING
	case PW_ACCOUNTING_RESPONSE:
		break;
#endif
//.........这里部分代码省略.........

static int
new_ssl_stream(const char *name, int fd, enum session_type type,
               enum ssl_state state, struct stream **streamp)
{
    struct ssl_stream *sslv;
    SSL *ssl = NULL;
    int retval;

    /* Check for all the needful configuration. */
    retval = 0;
    if (!private_key.read) {
        VLOG_ERR("Private key must be configured to use SSL");
        retval = ENOPROTOOPT;
    }
    if (!certificate.read) {
        VLOG_ERR("Certificate must be configured to use SSL");
        retval = ENOPROTOOPT;
    }
    if (!ca_cert.read && verify_peer_cert && !bootstrap_ca_cert) {
        VLOG_ERR("CA certificate must be configured to use SSL");
        retval = ENOPROTOOPT;
    }
    if (!retval && !SSL_CTX_check_private_key(ctx)) {
        VLOG_ERR("Private key does not match certificate public key: %s",
                 ERR_error_string(ERR_get_error(), NULL));
        retval = ENOPROTOOPT;
    }
    if (retval) {
        goto error;
    }

    /* Disable Nagle.
     * On windows platforms, this can only be called upon TCP connected.
     */
    if (state == STATE_SSL_CONNECTING) {
        setsockopt_tcp_nodelay(fd);
    }

    /* Create and configure OpenSSL stream. */
    ssl = SSL_new(ctx);
    if (ssl == NULL) {
        VLOG_ERR("SSL_new: %s", ERR_error_string(ERR_get_error(), NULL));
        retval = ENOPROTOOPT;
        goto error;
    }
    if (SSL_set_fd(ssl, fd) == 0) {
        VLOG_ERR("SSL_set_fd: %s", ERR_error_string(ERR_get_error(), NULL));
        retval = ENOPROTOOPT;
        goto error;
    }
    if (!verify_peer_cert || (bootstrap_ca_cert && type == CLIENT)) {
        SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
    }

    /* Create and return the ssl_stream. */
    sslv = xmalloc(sizeof *sslv);
    stream_init(&sslv->stream, &ssl_stream_class, EAGAIN, name);
    sslv->state = state;
    sslv->type = type;
    sslv->fd = fd;
    sslv->ssl = ssl;
    sslv->txbuf = NULL;
    sslv->rx_want = sslv->tx_want = SSL_NOTHING;
    sslv->session_nr = next_session_nr++;
    sslv->n_head = 0;

    if (VLOG_IS_DBG_ENABLED()) {
        SSL_set_msg_callback(ssl, ssl_protocol_cb);
        SSL_set_msg_callback_arg(ssl, sslv);
    }

    *streamp = &sslv->stream;
    return 0;

error:
    if (ssl) {
        SSL_free(ssl);
    }
    closesocket(fd);
    return retval;
}

static int
interpret_ssl_error(const char *function, int ret, int error,
                    int *want)
{
    *want = SSL_NOTHING;

    switch (error) {
    case SSL_ERROR_NONE:
        VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_NONE", function);
        break;

    case SSL_ERROR_ZERO_RETURN:
        VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_ZERO_RETURN", function);
        break;

    case SSL_ERROR_WANT_READ:
        *want = SSL_READING;
        return EAGAIN;

    case SSL_ERROR_WANT_WRITE:
        *want = SSL_WRITING;
        return EAGAIN;

    case SSL_ERROR_WANT_CONNECT:
        VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_CONNECT", function);
        break;

    case SSL_ERROR_WANT_ACCEPT:
        VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_ACCEPT", function);
        break;

    case SSL_ERROR_WANT_X509_LOOKUP:
        VLOG_ERR_RL(&rl, "%s: unexpected SSL_ERROR_WANT_X509_LOOKUP",
                    function);
        break;

    case SSL_ERROR_SYSCALL: {
        int queued_error = ERR_get_error();
        if (queued_error == 0) {
            if (ret < 0) {
                int status = errno;
                VLOG_WARN_RL(&rl, "%s: system error (%s)",
                             function, ovs_strerror(status));
                return status;
            } else {
                VLOG_WARN_RL(&rl, "%s: unexpected SSL connection close",
                             function);
                return EPROTO;
            }
        } else {
            VLOG_WARN_RL(&rl, "%s: %s",
                         function, ERR_error_string(queued_error, NULL));
            break;
        }
    }

    case SSL_ERROR_SSL:
        interpret_queued_ssl_error(function);
        break;

    default:
        VLOG_ERR_RL(&rl, "%s: bad SSL error code %d", function, error);
        break;
    }
    return EIO;
}

/**
 * @return returns X.509 certificate serial number.
 * @throws IOException exception is thrown if the serial is incorrect.
 */
long digidoc::X509Cert::getSerial() const throw(IOException)
{
    long serial = ASN1_INTEGER_get(X509_get_serialNumber(cert));
    if(serial <= 0)
    {
        THROW_IOEXCEPTION("Failed to read certificate serial number from X.509 certificate: %s", ERR_reason_error_string(ERR_get_error()));
    }

    return serial;
}

int
rb_setup_ssl_server(const char *cert, const char *keyfile, const char *dhfile, const char *cipher_list)
{
	DH *dh;
	unsigned long err;
	if(cert == NULL)
	{
		rb_lib_log("rb_setup_ssl_server: No certificate file");
		return 0;
	}
	if(!SSL_CTX_use_certificate_chain_file(ssl_server_ctx, cert) || !SSL_CTX_use_certificate_chain_file(ssl_client_ctx, cert))
	{
		err = ERR_get_error();
		rb_lib_log("rb_setup_ssl_server: Error loading certificate file [%s]: %s", cert,
			   get_ssl_error(err));
		return 0;
	}

	if(keyfile == NULL)
	{
		rb_lib_log("rb_setup_ssl_server: No key file");
		return 0;
	}


	if(!SSL_CTX_use_PrivateKey_file(ssl_server_ctx, keyfile, SSL_FILETYPE_PEM) || !SSL_CTX_use_PrivateKey_file(ssl_client_ctx, keyfile, SSL_FILETYPE_PEM))
	{
		err = ERR_get_error();
		rb_lib_log("rb_setup_ssl_server: Error loading keyfile [%s]: %s", keyfile,
			   get_ssl_error(err));
		return 0;
	}

	if(dhfile != NULL)
	{
		/* DH parameters aren't necessary, but they are nice..if they didn't pass one..that is their problem */
		BIO *bio = BIO_new_file(dhfile, "r");
		if(bio != NULL)
		{
			dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
			if(dh == NULL)
			{
				err = ERR_get_error();
				rb_lib_log
					("rb_setup_ssl_server: Error loading DH params file [%s]: %s",
					 dhfile, get_ssl_error(err));
				BIO_free(bio);
				return 0;
			}
			BIO_free(bio);
			SSL_CTX_set_tmp_dh(ssl_server_ctx, dh);
		}
		else
		{
			err = ERR_get_error();
			rb_lib_log("rb_setup_ssl_server: Error loading DH params file [%s]: %s",
				   dhfile, get_ssl_error(err));
		}
	}

	if (cipher_list != NULL)
	{
		SSL_CTX_set_cipher_list(ssl_server_ctx, cipher_list);
	}

	return 1;
}

int
rb_init_ssl(void)
{
	int ret = 1;
	char librb_data[] = "librb data";
	const char librb_ciphers[] = "kEECDH+HIGH:kEDH+HIGH:HIGH:!RC4:!aNULL";
	SSL_load_error_strings();
	SSL_library_init();
	librb_index = SSL_get_ex_new_index(0, librb_data, NULL, NULL, NULL);

#ifndef LRB_HAVE_TLS_METHOD_API
	ssl_server_ctx = SSL_CTX_new(SSLv23_server_method());
#else
	ssl_server_ctx = SSL_CTX_new(TLS_server_method());
#endif

	if(ssl_server_ctx == NULL)
	{
		rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL server context: %s",
			   get_ssl_error(ERR_get_error()));
		ret = 0;
	}

	long server_options = SSL_CTX_get_options(ssl_server_ctx);

#ifndef LRB_HAVE_TLS_METHOD_API
	server_options |= SSL_OP_NO_SSLv2;
	server_options |= SSL_OP_NO_SSLv3;
#endif

#ifdef SSL_OP_SINGLE_DH_USE
	server_options |= SSL_OP_SINGLE_DH_USE;
#endif

#ifdef SSL_OP_SINGLE_ECDH_USE
	server_options |= SSL_OP_SINGLE_ECDH_USE;
#endif

#ifdef SSL_OP_NO_TICKET
	server_options |= SSL_OP_NO_TICKET;
#endif

	server_options |= SSL_OP_CIPHER_SERVER_PREFERENCE;

	SSL_CTX_set_options(ssl_server_ctx, server_options);
	SSL_CTX_set_verify(ssl_server_ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, verify_accept_all_cb);
	SSL_CTX_set_session_cache_mode(ssl_server_ctx, SSL_SESS_CACHE_OFF);
	SSL_CTX_set_cipher_list(ssl_server_ctx, librb_ciphers);

	/* Set ECDHE on OpenSSL 1.00+, but make sure it's actually available
	 * (it's not by default on Solaris or Red Hat... fuck Red Hat and Oracle)
	 */
	#if (OPENSSL_VERSION_NUMBER >= 0x10000000L) && !defined(OPENSSL_NO_ECDH)
		EC_KEY *key = EC_KEY_new_by_curve_name(NID_secp384r1);
		if (key) {
			SSL_CTX_set_tmp_ecdh(ssl_server_ctx, key);
			EC_KEY_free(key);
		}
	#endif

#ifndef LRB_HAVE_TLS_METHOD_API
	ssl_client_ctx = SSL_CTX_new(SSLv23_client_method());
#else
	ssl_client_ctx = SSL_CTX_new(TLS_client_method());
#endif

	if(ssl_client_ctx == NULL)
	{
		rb_lib_log("rb_init_openssl: Unable to initialize OpenSSL client context: %s",
			   get_ssl_error(ERR_get_error()));
		ret = 0;
	}

#ifndef LRB_HAVE_TLS_METHOD_API
	SSL_CTX_set_options(ssl_client_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
#endif

#ifdef SSL_OP_NO_TICKET
	SSL_CTX_set_options(ssl_client_ctx, SSL_OP_NO_TICKET);
#endif

	SSL_CTX_set_cipher_list(ssl_client_ctx, librb_ciphers);

	return ret;
}

int main(){
  int len = 1024; //buffer length
  char buf[len]; //read buffer
  
  /* Initializing OpenSSL */
  SSL_load_error_strings();
  ERR_load_BIO_strings();
  OpenSSL_add_all_algorithms();
  SSL_library_init();

  BIO *bio, *abio, *out; //the sockets
  SSL_CTX *ctx = SSL_CTX_new(SSLv23_server_method());
  SSL *ssl;

  if( ctx == NULL ){
    fprintf(stderr, "DEBUG ctx is null\n");
    fprintf(stderr, "ERROR::OpenSLL: %s\n", ERR_reason_error_string(ERR_get_error()));
    exit(1);
  }
  
  //get password for private key
  //  SSL_CTX_set_default_passwd_cb( ctx, &pem_passwd_cb );

  //load certificate (with public key)
  SSL_CTX_use_certificate_file( ctx, "/home/mml/Develop/ca/certs/01.pem", SSL_FILETYPE_PEM);
  //load private key
  SSL_CTX_use_PrivateKey_file( ctx, "/home/mml/Develop/ca/testkey.pem", SSL_FILETYPE_PEM);

  bio = BIO_new_ssl(ctx, 0);
  if( bio == NULL ){
    fprintf(stderr, "ERROR cannot bind\n");
    exit(1);
  }

  BIO_get_ssl(bio, &ssl);
  SSL_set_mode( ssl, SSL_MODE_AUTO_RETRY );

  abio = BIO_new_accept("localhost:15001");
  BIO_set_accept_bios(abio, bio);

  BIO_do_accept(abio);

  fprintf(stdout, "DEBUG: waiting for connection\n");
  BIO_do_accept(abio);

  out = BIO_pop(abio);

  fprintf(stdout, "DEBUG: doing handshake\n");
  BIO_do_handshake(out);
  
  if(BIO_write(out, "Hello", 5) <= 0){
    if(! BIO_should_retry(bio)) {
      fprintf(stderr, "ERROR connection is already closed. (write)\n");
      exit(1);
    } else {
      //retry routine
    }
  }
  
  bzero(buf, len); 
  if( BIO_read(out, buf, len) <= 0 ){
    if( !(BIO_should_retry(bio)) ){
      fprintf(stderr, "ERROR connection is already closed (read)\n");
      exit(0);
      
    } else {
      //retry routine
    }
  }

  fprintf(stdout, "Hello%s\n", buf);

  //close connection
  BIO_free_all(abio);
  BIO_free_all(out);
  BIO_free_all(bio);
  SSL_CTX_free(ctx);
  
  return 0;
}

void _openssl_log_error(int rc, SSL *con, const char *location) {
    const char     *reason, *file, *data;
    unsigned long   numerical_reason;
    int             flags, line;

    snmp_log(LOG_ERR, "---- OpenSSL Related Errors: ----\n");

    /* SSL specific errors */
    if (con) {

        int sslnum = SSL_get_error(con, rc);

        switch(sslnum) {
        case SSL_ERROR_NONE:
            reason = "SSL_ERROR_NONE";
            break;

        case SSL_ERROR_SSL:
            reason = "SSL_ERROR_SSL";
            break;

        case SSL_ERROR_WANT_READ:
            reason = "SSL_ERROR_WANT_READ";
            break;

        case SSL_ERROR_WANT_WRITE:
            reason = "SSL_ERROR_WANT_WRITE";
            break;

        case SSL_ERROR_WANT_X509_LOOKUP:
            reason = "SSL_ERROR_WANT_X509_LOOKUP";
            break;

        case SSL_ERROR_SYSCALL:
            reason = "SSL_ERROR_SYSCALL";
            snmp_log(LOG_ERR, "TLS error: %s: rc=%d, sslerror = %d (%s): system_error=%d (%s)\n",
                     location, rc, sslnum, reason, errno, strerror(errno));
            snmp_log(LOG_ERR, "TLS Error: %s\n",
                     ERR_reason_error_string(ERR_get_error()));
            return;

        case SSL_ERROR_ZERO_RETURN:
            reason = "SSL_ERROR_ZERO_RETURN";
            break;

        case SSL_ERROR_WANT_CONNECT:
            reason = "SSL_ERROR_WANT_CONNECT";
            break;

        case SSL_ERROR_WANT_ACCEPT:
            reason = "SSL_ERROR_WANT_ACCEPT";
            break;
            
        default:
            reason = "unknown";
        }

        snmp_log(LOG_ERR, " TLS error: %s: rc=%d, sslerror = %d (%s)\n",
                 location, rc, sslnum, reason);

        snmp_log(LOG_ERR, " TLS Error: %s\n",
                 ERR_reason_error_string(ERR_get_error()));

    }

    /* other errors */
    while ((numerical_reason =
            ERR_get_error_line_data(&file, &line, &data, &flags)) != 0) {
        snmp_log(LOG_ERR, " error: #%lu (file %s, line %d)\n",
                 numerical_reason, file, line);

        /* if we have a text translation: */
        if (data && (flags & ERR_TXT_STRING)) {
            snmp_log(LOG_ERR, "  Textual Error: %s\n", data);
            /*
             * per openssl man page: If it has been allocated by
             * OPENSSL_malloc(), *flags&ERR_TXT_MALLOCED is true.
             *
             * arggh... stupid openssl prototype for ERR_get_error_line_data
             * wants a const char **, but returns something that we might
             * need to free??
             */
            if (flags & ERR_TXT_MALLOCED)
                OPENSSL_free(NETSNMP_REMOVE_CONST(void *, data));        }
    }
    
    snmp_log(LOG_ERR, "---- End of OpenSSL Errors ----\n");
}

tcp_stream_t *
tcp_stream_create_ssl_from_fd(int fd, const char *hostname,
                              const tcp_ssl_info_t *tsi,
                              char *errbuf, size_t errlen)
{
  char errmsg[120];

  tcp_stream_t *ts = calloc(1, sizeof(tcp_stream_t));
  ts->ts_fd = fd;

  if((ts->ts_ssl = SSL_new(ssl_ctx)) == NULL)
    goto bad_ssl;


  if(SSL_set_fd(ts->ts_ssl, fd) == 0)
    goto bad_ssl;

  if(tsi->key != NULL) {
    BIO *cbio = BIO_new_mem_buf((char *)tsi->key, -1);
    EVP_PKEY *key = PEM_read_bio_PrivateKey(cbio, NULL, NULL, NULL);
    BIO_free(cbio);
    if(key == NULL) {
      snprintf(errbuf, errlen, "Unable to load private key");
      goto bad;
    }

    SSL_use_PrivateKey(ts->ts_ssl, key);
    EVP_PKEY_free(key);
  }

  if(tsi->cert != NULL) {
    BIO *cbio = BIO_new_mem_buf((char *)tsi->cert, -1);
    X509 *cert = PEM_read_bio_X509(cbio, NULL, 0, NULL);
    BIO_free(cbio);

    if(cert == NULL) {
      snprintf(errbuf, errlen, "Unable to load certificate");
      goto bad;
    }

    SSL_use_certificate(ts->ts_ssl, cert);
    X509_free(cert);
  }

  if(SSL_connect(ts->ts_ssl) <= 0) {
    goto bad_ssl;
  }

  SSL_set_mode(ts->ts_ssl, SSL_MODE_AUTO_RETRY);

  X509 *peer = SSL_get_peer_certificate(ts->ts_ssl);
  if(peer == NULL) {
    goto bad_ssl;
  }

  int err = SSL_get_verify_result(ts->ts_ssl);
  if(err != X509_V_OK) {
    snprintf(errbuf, errlen, "Certificate error: %s",
             X509_verify_cert_error_string(err));
    X509_free(peer);
    goto bad;
  }

  if(verify_hostname(hostname, peer, errbuf, errlen)) {
    X509_free(peer);
    goto bad;
  }

  X509_free(peer);

  ts->ts_fd = fd;
  htsbuf_queue_init(&ts->ts_spill, INT32_MAX);
  htsbuf_queue_init(&ts->ts_sendq, INT32_MAX);

  ts->ts_write = ssl_write;
  ts->ts_read  = ssl_read;
  return ts;

 bad_ssl:
  ERR_error_string(ERR_get_error(), errmsg);
  snprintf(errbuf, errlen, "SSL: %s", errmsg);
 bad:
  tcp_close(ts);
  return NULL;
}

/* RSASSA-PKCS1-v1_5 (PKCS #1 v2.0 signature) with SHA1 */
int
ssh_rsa_sign(const Key *key, u_char **sigp, u_int *lenp,
    const u_char *data, u_int datalen)
{
	const EVP_MD *evp_md;
	EVP_MD_CTX md;
	u_char *sig = NULL;
	u_int slen = 0, len;
#ifdef USE_LEGACY_RSA_SIGN
	u_char digest[EVP_MAX_MD_SIZE];
	u_int dlen;
#endif
	int ok, nid;
	Buffer b;

	if (key == NULL || key->rsa == NULL || (key->type != KEY_RSA &&
	    key->type != KEY_RSA_CERT && key->type != KEY_RSA_CERT_V00)) {
		error("ssh_rsa_sign: no RSA key");
		return -1;
	}
	nid = (datafellows & SSH_BUG_RSASIGMD5) ? NID_md5 : NID_sha1;
	if ((evp_md = EVP_get_digestbynid(nid)) == NULL) {
		error("ssh_rsa_sign: EVP_get_digestbynid %d failed", nid);
		return -1;
	}

#ifdef USE_LEGACY_RSA_SIGN
	EVP_DigestInit(&md, evp_md);
	EVP_DigestUpdate(&md, data, datalen);
	EVP_DigestFinal(&md, digest, &dlen);

	slen = RSA_size(key->rsa);
	sig = xmalloc(slen);

	ok = RSA_sign(nid, digest, dlen, sig, &len, key->rsa);
	memset(digest, 'd', sizeof(digest));
#else /*ndef USE_LEGACY_RSA_SIGN*/
{
	EVP_PKEY *pkey = NULL;

	ok = -1;
	pkey = EVP_PKEY_new();
	if (pkey == NULL) {
		error("%s: out of memory", __func__);
		goto done;
	}

	EVP_PKEY_set1_RSA(pkey, key->rsa);

	slen = EVP_PKEY_size(pkey);
	sig = xmalloc(slen);	/*fatal on error*/

	ssh_EVP_MD_CTX_init(&md);
	
	ok = ssh_EVP_SignInit_ex(&md, evp_md, NULL);
	if (ok <= 0) {
		char ebuf[256];
		error("%s: EVP_SignInit_ex fail with errormsg='%.*s'"
		, __func__
		, (int)sizeof(ebuf), openssl_errormsg(ebuf, sizeof(ebuf)));
		goto clean;
	}

	ok = ssh_EVP_SignUpdate(&md, data, datalen);
	if (ok <= 0) {
		char ebuf[256];
		error("%s: EVP_SignUpdate fail with errormsg='%.*s'"
		, __func__
		, (int)sizeof(ebuf), openssl_errormsg(ebuf, sizeof(ebuf)));
		goto clean;
	}

	ok = EVP_SignFinal(&md, sig, &len, pkey);
	if (ok <= 0) {
		char ebuf[256];
		error("%s: SignFinal fail with errormsg='%.*s'"
		, __func__
		, (int)sizeof(ebuf), openssl_errormsg(ebuf, sizeof(ebuf)));
		goto clean;
	}

clean:
	ssh_EVP_MD_CTX_cleanup(&md);

done:
	if (pkey != NULL) EVP_PKEY_free(pkey);
}
#endif /*ndef USE_LEGACY_RSA_SIGN*/

	if (ok <= 0) {
	#ifdef USE_LEGACY_RSA_SIGN
		int ecode = ERR_get_error();

		error("ssh_rsa_sign: RSA_sign failed: %s",
		    ERR_error_string(ecode, NULL));
	#endif /*def USE_LEGACY_RSA_SIGN*/
		xfree(sig);
		return -1;
	}
//.........这里部分代码省略.........

static int
do_ca_cert_bootstrap(struct stream *stream)
{
    struct ssl_stream *sslv = ssl_stream_cast(stream);
    STACK_OF(X509) *chain;
    X509 *cert;
    FILE *file;
    int error;
    int fd;

    chain = SSL_get_peer_cert_chain(sslv->ssl);
    if (!chain || !sk_X509_num(chain)) {
        VLOG_ERR("could not bootstrap CA cert: no certificate presented by "
                 "peer");
        return EPROTO;
    }
    cert = sk_X509_value(chain, sk_X509_num(chain) - 1);

    /* Check that 'cert' is self-signed.  Otherwise it is not a CA
     * certificate and we should not attempt to use it as one. */
    error = X509_check_issued(cert, cert);
    if (error) {
        VLOG_ERR("could not bootstrap CA cert: obtained certificate is "
                 "not self-signed (%s)",
                 X509_verify_cert_error_string(error));
        if (sk_X509_num(chain) < 2) {
            VLOG_ERR("only one certificate was received, so probably the peer "
                     "is not configured to send its CA certificate");
        }
        return EPROTO;
    }

    fd = open(ca_cert.file_name, O_CREAT | O_EXCL | O_WRONLY, 0444);
    if (fd < 0) {
        if (errno == EEXIST) {
            VLOG_INFO_RL(&rl, "reading CA cert %s created by another process",
                         ca_cert.file_name);
            stream_ssl_set_ca_cert_file__(ca_cert.file_name, true, true);
            return EPROTO;
        } else {
            VLOG_ERR("could not bootstrap CA cert: creating %s failed: %s",
                     ca_cert.file_name, ovs_strerror(errno));
            return errno;
        }
    }

    file = fdopen(fd, "w");
    if (!file) {
        error = errno;
        VLOG_ERR("could not bootstrap CA cert: fdopen failed: %s",
                 ovs_strerror(error));
        unlink(ca_cert.file_name);
        return error;
    }

    if (!PEM_write_X509(file, cert)) {
        VLOG_ERR("could not bootstrap CA cert: PEM_write_X509 to %s failed: "
                 "%s", ca_cert.file_name,
                 ERR_error_string(ERR_get_error(), NULL));
        fclose(file);
        unlink(ca_cert.file_name);
        return EIO;
    }

    if (fclose(file)) {
        error = errno;
        VLOG_ERR("could not bootstrap CA cert: writing %s failed: %s",
                 ca_cert.file_name, ovs_strerror(error));
        unlink(ca_cert.file_name);
        return error;
    }

    VLOG_INFO("successfully bootstrapped CA cert to %s", ca_cert.file_name);
    log_ca_cert(ca_cert.file_name, cert);
    bootstrap_ca_cert = false;
    ca_cert.read = true;

    /* SSL_CTX_add_client_CA makes a copy of cert's relevant data. */
    SSL_CTX_add_client_CA(ctx, cert);

    SSL_CTX_set_cert_store(ctx, X509_STORE_new());
    if (SSL_CTX_load_verify_locations(ctx, ca_cert.file_name, NULL) != 1) {
        VLOG_ERR("SSL_CTX_load_verify_locations: %s",
                 ERR_error_string(ERR_get_error(), NULL));
        return EPROTO;
    }
    VLOG_INFO("killing successful connection to retry using CA cert");
    return EPROTO;
}

int AuthenticateAgent(AgentConnection *conn, Attributes attr, Promise *pp)
{
    char sendbuffer[CF_EXPANDSIZE], in[CF_BUFSIZE], *out, *decrypted_cchall;
    BIGNUM *nonce_challenge, *bn = NULL;
    unsigned long err;
    unsigned char digest[EVP_MAX_MD_SIZE];
    int encrypted_len, nonce_len = 0, len, session_size;
    bool implicitly_trust_server;
    char enterprise_field = 'c';
    RSA *server_pubkey = NULL;

    if ((PUBKEY == NULL) || (PRIVKEY == NULL))
    {
        CfOut(cf_error, "", "No public/private key pair found at %s\n", CFPUBKEYFILE);
        return false;
    }

    enterprise_field = CfEnterpriseOptions();
    session_size = CfSessionKeySize(enterprise_field);

/* Generate a random challenge to authenticate the server */

    nonce_challenge = BN_new();
    if (nonce_challenge == NULL)
    {
        CfOut(cf_error, "", "Cannot allocate BIGNUM structure for server challenge\n");
        return false;
    }

    BN_rand(nonce_challenge, CF_NONCELEN, 0, 0);
    nonce_len = BN_bn2mpi(nonce_challenge, in);

    if (FIPS_MODE)
    {
        HashString(in, nonce_len, digest, CF_DEFAULT_DIGEST);
    }
    else
    {
        HashString(in, nonce_len, digest, cf_md5);
    }

/* We assume that the server bound to the remote socket is the official one i.e. = root's */

    if ((server_pubkey = HavePublicKeyByIP(conn->username, conn->remoteip)))
    {
        implicitly_trust_server = false;
        encrypted_len = RSA_size(server_pubkey);
    }
    else
    {
        implicitly_trust_server = true;
        encrypted_len = nonce_len;
    }

// Server pubkey is what we want to has as a unique ID

    snprintf(sendbuffer, sizeof(sendbuffer), "SAUTH %c %d %d %c", implicitly_trust_server ? 'n': 'y', encrypted_len,
             nonce_len, enterprise_field);

    out = xmalloc(encrypted_len);

    if (server_pubkey != NULL)
    {
        if (RSA_public_encrypt(nonce_len, in, out, server_pubkey, RSA_PKCS1_PADDING) <= 0)
        {
            err = ERR_get_error();
            cfPS(cf_error, CF_FAIL, "", pp, attr, "Public encryption failed = %s\n", ERR_reason_error_string(err));
            free(out);
            RSA_free(server_pubkey);
            return false;
        }

        memcpy(sendbuffer + CF_RSA_PROTO_OFFSET, out, encrypted_len);
    }
    else
    {
        memcpy(sendbuffer + CF_RSA_PROTO_OFFSET, in, nonce_len);
    }

/* proposition C1 - Send challenge / nonce */

    SendTransaction(conn->sd, sendbuffer, CF_RSA_PROTO_OFFSET + encrypted_len, CF_DONE);

    BN_free(bn);
    BN_free(nonce_challenge);
    free(out);

    if (DEBUG)
    {
        RSA_print_fp(stdout, PUBKEY, 0);
    }

/*Send the public key - we don't know if server has it */
/* proposition C2 */

    memset(sendbuffer, 0, CF_EXPANDSIZE);
    len = BN_bn2mpi(PUBKEY->n, sendbuffer);
    SendTransaction(conn->sd, sendbuffer, len, CF_DONE);        /* No need to encrypt the public key ... */

/* proposition C3 */
//.........这里部分代码省略.........