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_ssl.c
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/* SSL socket module
SSL support based on patches by Brian E Gallew and Laszlo Kovacs.
Re-worked a bit by Bill Janssen to add server-side support and
certificate decoding. Chris Stawarz contributed some non-blocking
patches.
This module is imported by ssl.py. It should *not* be used
directly.
XXX should partial writes be enabled, SSL_MODE_ENABLE_PARTIAL_WRITE?
XXX integrate several "shutdown modes" as suggested in
http://bugs.python.org/issue8108#msg102867 ?
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pythread.h"
/* Redefined below for Windows debug builds after important #includes */
#define _PySSL_FIX_ERRNO
#define PySSL_BEGIN_ALLOW_THREADS_S(save) \
do { if (_ssl_locks_count>0) { (save) = PyEval_SaveThread(); } } while (0)
#define PySSL_END_ALLOW_THREADS_S(save) \
do { if (_ssl_locks_count>0) { PyEval_RestoreThread(save); } _PySSL_FIX_ERRNO; } while (0)
#define PySSL_BEGIN_ALLOW_THREADS { \
PyThreadState *_save = NULL; \
PySSL_BEGIN_ALLOW_THREADS_S(_save);
#define PySSL_BLOCK_THREADS PySSL_END_ALLOW_THREADS_S(_save);
#define PySSL_UNBLOCK_THREADS PySSL_BEGIN_ALLOW_THREADS_S(_save);
#define PySSL_END_ALLOW_THREADS PySSL_END_ALLOW_THREADS_S(_save); }
/* Include symbols from _socket module */
#include "socketmodule.h"
static PySocketModule_APIObject PySocketModule;
#if defined(HAVE_POLL_H)
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#endif
/* Don't warn about deprecated functions */
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#ifdef __clang__
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
/* Include OpenSSL header files */
#include "openssl/rsa.h"
#include "openssl/crypto.h"
#include "openssl/x509.h"
#include "openssl/x509v3.h"
#include "openssl/pem.h"
#include "openssl/ssl.h"
#include "openssl/err.h"
#include "openssl/rand.h"
#include "openssl/bio.h"
#ifndef HAVE_X509_VERIFY_PARAM_SET1_HOST
# ifdef LIBRESSL_VERSION_NUMBER
# error "LibreSSL is missing X509_VERIFY_PARAM_set1_host(), see https://github.com/libressl-portable/portable/issues/381"
# elif OPENSSL_VERSION_NUMBER > 0x1000200fL
# define HAVE_X509_VERIFY_PARAM_SET1_HOST
# else
# error "libssl is too old and does not support X509_VERIFY_PARAM_set1_host()"
# endif
#endif
/* SSL error object */
static PyObject *PySSLErrorObject;
static PyObject *PySSLCertVerificationErrorObject;
static PyObject *PySSLZeroReturnErrorObject;
static PyObject *PySSLWantReadErrorObject;
static PyObject *PySSLWantWriteErrorObject;
static PyObject *PySSLSyscallErrorObject;
static PyObject *PySSLEOFErrorObject;
/* Error mappings */
static PyObject *err_codes_to_names;
static PyObject *err_names_to_codes;
static PyObject *lib_codes_to_names;
struct py_ssl_error_code {
const char *mnemonic;
int library, reason;
};
struct py_ssl_library_code {
const char *library;
int code;
};
#if defined(MS_WINDOWS) && defined(Py_DEBUG)
/* Debug builds on Windows rely on getting errno directly from OpenSSL.
* However, because it uses a different CRT, we need to transfer the
* value of errno from OpenSSL into our debug CRT.
*
* Don't be fooled - this is horribly ugly code. The only reasonable
* alternative is to do both debug and release builds of OpenSSL, which
* requires much uglier code to transform their automatically generated
* makefile. This is the lesser of all the evils.
*/
static void _PySSLFixErrno(void) {
HMODULE ucrtbase = GetModuleHandleW(L"ucrtbase.dll");
if (!ucrtbase) {
/* If ucrtbase.dll is not loaded but the SSL DLLs are, we likely
* have a catastrophic failure, but this function is not the
* place to raise it. */
return;
}
typedef int *(__stdcall *errno_func)(void);
errno_func ssl_errno = (errno_func)GetProcAddress(ucrtbase, "_errno");
if (ssl_errno) {
errno = *ssl_errno();
*ssl_errno() = 0;
} else {
errno = ENOTRECOVERABLE;
}
}
#undef _PySSL_FIX_ERRNO
#define _PySSL_FIX_ERRNO _PySSLFixErrno()
#endif
/* Include generated data (error codes) */
#include "_ssl_data.h"
#if (OPENSSL_VERSION_NUMBER >= 0x10100000L) && !defined(LIBRESSL_VERSION_NUMBER)
# define OPENSSL_VERSION_1_1 1
#endif
/* Openssl comes with TLSv1.1 and TLSv1.2 between 1.0.0h and 1.0.1
http://www.openssl.org/news/changelog.html
*/
#if OPENSSL_VERSION_NUMBER >= 0x10001000L
# define HAVE_TLSv1_2 1
#else
# define HAVE_TLSv1_2 0
#endif
/* SNI support (client- and server-side) appeared in OpenSSL 1.0.0 and 0.9.8f
* This includes the SSL_set_SSL_CTX() function.
*/
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
# define HAVE_SNI 1
#else
# define HAVE_SNI 0
#endif
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
# define HAVE_ALPN
#endif
#ifndef INVALID_SOCKET /* MS defines this */
#define INVALID_SOCKET (-1)
#endif
#ifdef OPENSSL_VERSION_1_1
/* OpenSSL 1.1.0+ */
#ifndef OPENSSL_NO_SSL2
#define OPENSSL_NO_SSL2
#endif
#else /* OpenSSL < 1.1.0 */
#define HAVE_OPENSSL_CRYPTO_LOCK
#define TLS_method SSLv23_method
#define TLS_client_method SSLv23_client_method
#define TLS_server_method SSLv23_server_method
static int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne)
{
return ne->set;
}
#ifndef OPENSSL_NO_COMP
/* LCOV_EXCL_START */
static int COMP_get_type(const COMP_METHOD *meth)
{
return meth->type;
}
/* LCOV_EXCL_STOP */
#endif
static pem_password_cb *SSL_CTX_get_default_passwd_cb(SSL_CTX *ctx)
{
return ctx->default_passwd_callback;
}
static void *SSL_CTX_get_default_passwd_cb_userdata(SSL_CTX *ctx)
{
return ctx->default_passwd_callback_userdata;
}
static int X509_OBJECT_get_type(X509_OBJECT *x)
{
return x->type;
}
static X509 *X509_OBJECT_get0_X509(X509_OBJECT *x)
{
return x->data.x509;
}
static int BIO_up_ref(BIO *b)
{
CRYPTO_add(&b->references, 1, CRYPTO_LOCK_BIO);
return 1;
}
static STACK_OF(X509_OBJECT) *X509_STORE_get0_objects(X509_STORE *store) {
return store->objs;
}
static int
SSL_SESSION_has_ticket(const SSL_SESSION *s)
{
return (s->tlsext_ticklen > 0) ? 1 : 0;
}
static unsigned long
SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s)
{
return s->tlsext_tick_lifetime_hint;
}
#endif /* OpenSSL < 1.1.0 or LibreSSL */
/* Default cipher suites */
#ifndef PY_SSL_DEFAULT_CIPHERS
#define PY_SSL_DEFAULT_CIPHERS 1
#endif
#if PY_SSL_DEFAULT_CIPHERS == 0
#ifndef PY_SSL_DEFAULT_CIPHER_STRING
#error "Py_SSL_DEFAULT_CIPHERS 0 needs Py_SSL_DEFAULT_CIPHER_STRING"
#endif
#elif PY_SSL_DEFAULT_CIPHERS == 1
/* Python custom selection of sensible ciper suites
* DEFAULT: OpenSSL's default cipher list. Since 1.0.2 the list is in sensible order.
* !aNULL:!eNULL: really no NULL ciphers
* !MD5:!3DES:!DES:!RC4:!IDEA:!SEED: no weak or broken algorithms on old OpenSSL versions.
* !aDSS: no authentication with discrete logarithm DSA algorithm
* !SRP:!PSK: no secure remote password or pre-shared key authentication
*/
#define PY_SSL_DEFAULT_CIPHER_STRING "DEFAULT:!aNULL:!eNULL:!MD5:!3DES:!DES:!RC4:!IDEA:!SEED:!aDSS:!SRP:!PSK"
#elif PY_SSL_DEFAULT_CIPHERS == 2
/* Ignored in SSLContext constructor, only used to as _ssl.DEFAULT_CIPHER_STRING */
#define PY_SSL_DEFAULT_CIPHER_STRING SSL_DEFAULT_CIPHER_LIST
#else
#error "Unsupported PY_SSL_DEFAULT_CIPHERS"
#endif
enum py_ssl_error {
/* these mirror ssl.h */
PY_SSL_ERROR_NONE,
PY_SSL_ERROR_SSL,
PY_SSL_ERROR_WANT_READ,
PY_SSL_ERROR_WANT_WRITE,
PY_SSL_ERROR_WANT_X509_LOOKUP,
PY_SSL_ERROR_SYSCALL, /* look at error stack/return value/errno */
PY_SSL_ERROR_ZERO_RETURN,
PY_SSL_ERROR_WANT_CONNECT,
/* start of non ssl.h errorcodes */
PY_SSL_ERROR_EOF, /* special case of SSL_ERROR_SYSCALL */
PY_SSL_ERROR_NO_SOCKET, /* socket has been GC'd */
PY_SSL_ERROR_INVALID_ERROR_CODE
};
enum py_ssl_server_or_client {
PY_SSL_CLIENT,
PY_SSL_SERVER
};
enum py_ssl_cert_requirements {
PY_SSL_CERT_NONE,
PY_SSL_CERT_OPTIONAL,
PY_SSL_CERT_REQUIRED
};
enum py_ssl_version {
PY_SSL_VERSION_SSL2,
PY_SSL_VERSION_SSL3=1,
PY_SSL_VERSION_TLS, /* SSLv23 */
#if HAVE_TLSv1_2
PY_SSL_VERSION_TLS1,
PY_SSL_VERSION_TLS1_1,
PY_SSL_VERSION_TLS1_2,
#else
PY_SSL_VERSION_TLS1,
#endif
PY_SSL_VERSION_TLS_CLIENT=0x10,
PY_SSL_VERSION_TLS_SERVER,
};
/* serves as a flag to see whether we've initialized the SSL thread support. */
/* 0 means no, greater than 0 means yes */
static unsigned int _ssl_locks_count = 0;
/* SSL socket object */
#define X509_NAME_MAXLEN 256
/* SSL_CTX_clear_options() and SSL_clear_options() were first added in
* OpenSSL 0.9.8m but do not appear in some 0.9.9-dev versions such the
* 0.9.9 from "May 2008" that NetBSD 5.0 uses. */
#if OPENSSL_VERSION_NUMBER >= 0x009080dfL && OPENSSL_VERSION_NUMBER != 0x00909000L
# define HAVE_SSL_CTX_CLEAR_OPTIONS
#else
# undef HAVE_SSL_CTX_CLEAR_OPTIONS
#endif
/* In case of 'tls-unique' it will be 12 bytes for TLS, 36 bytes for
* older SSL, but let's be safe */
#define PySSL_CB_MAXLEN 128
typedef struct {
PyObject_HEAD
SSL_CTX *ctx;
#if defined(OPENSSL_NPN_NEGOTIATED) && !defined(OPENSSL_NO_NEXTPROTONEG)
unsigned char *npn_protocols;
int npn_protocols_len;
#endif
#ifdef HAVE_ALPN
unsigned char *alpn_protocols;
unsigned int alpn_protocols_len;
#endif
#ifndef OPENSSL_NO_TLSEXT
PyObject *set_hostname;
#endif
int check_hostname;
/* OpenSSL has no API to get hostflags from X509_VERIFY_PARAM* struct.
* We have to maintain our own copy. OpenSSL's hostflags default to 0.
*/
unsigned int hostflags;
} PySSLContext;
typedef struct {
PyObject_HEAD
PyObject *Socket; /* weakref to socket on which we're layered */
SSL *ssl;
PySSLContext *ctx; /* weakref to SSL context */
char shutdown_seen_zero;
enum py_ssl_server_or_client socket_type;
PyObject *owner; /* Python level "owner" passed to servername callback */
PyObject *server_hostname;
int ssl_errno; /* last seen error from SSL */
int c_errno; /* last seen error from libc */
#ifdef MS_WINDOWS
int ws_errno; /* last seen error from winsock */
#endif
} PySSLSocket;
typedef struct {
PyObject_HEAD
BIO *bio;
int eof_written;
} PySSLMemoryBIO;
typedef struct {
PyObject_HEAD
SSL_SESSION *session;
PySSLContext *ctx;
} PySSLSession;
static PyTypeObject PySSLContext_Type;
static PyTypeObject PySSLSocket_Type;
static PyTypeObject PySSLMemoryBIO_Type;
static PyTypeObject PySSLSession_Type;
#ifdef MS_WINDOWS
#define _PySSL_UPDATE_ERRNO_IF(cond, sock, retcode) if (cond) { \
(sock)->ws_errno = WSAGetLastError(); \
_PySSL_FIX_ERRNO; \
(sock)->c_errno = errno; \
(sock)->ssl_errno = SSL_get_error((sock->ssl), (retcode)); \
} else { sock->ws_errno = 0; sock->c_errno = 0; sock->ssl_errno = 0; }
#else
#define _PySSL_UPDATE_ERRNO_IF(cond, sock, retcode) if (cond) { \
(sock)->c_errno = errno; \
(sock)->ssl_errno = SSL_get_error((sock->ssl), (retcode)); \
} else { (sock)->c_errno = 0; (sock)->ssl_errno = 0; }
#endif
#define _PySSL_UPDATE_ERRNO(sock, retcode) _PySSL_UPDATE_ERRNO_IF(1, (sock), (retcode))
/*[clinic input]
module _ssl
class _ssl._SSLContext "PySSLContext *" "&PySSLContext_Type"
class _ssl._SSLSocket "PySSLSocket *" "&PySSLSocket_Type"
class _ssl.MemoryBIO "PySSLMemoryBIO *" "&PySSLMemoryBIO_Type"
class _ssl.SSLSession "PySSLSession *" "&PySSLSession_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=bdc67fafeeaa8109]*/
#include "clinic/_ssl.c.h"
static int PySSL_select(PySocketSockObject *s, int writing, _PyTime_t timeout);
#define PySSLContext_Check(v) (Py_TYPE(v) == &PySSLContext_Type)
#define PySSLSocket_Check(v) (Py_TYPE(v) == &PySSLSocket_Type)
#define PySSLMemoryBIO_Check(v) (Py_TYPE(v) == &PySSLMemoryBIO_Type)
#define PySSLSession_Check(v) (Py_TYPE(v) == &PySSLSession_Type)
typedef enum {
SOCKET_IS_NONBLOCKING,
SOCKET_IS_BLOCKING,
SOCKET_HAS_TIMED_OUT,
SOCKET_HAS_BEEN_CLOSED,
SOCKET_TOO_LARGE_FOR_SELECT,
SOCKET_OPERATION_OK
} timeout_state;
/* Wrap error strings with filename and line # */
#define ERRSTR1(x,y,z) (x ":" y ": " z)
#define ERRSTR(x) ERRSTR1("_ssl.c", Py_STRINGIFY(__LINE__), x)
/* Get the socket from a PySSLSocket, if it has one */
#define GET_SOCKET(obj) ((obj)->Socket ? \
(PySocketSockObject *) PyWeakref_GetObject((obj)->Socket) : NULL)
/* If sock is NULL, use a timeout of 0 second */
#define GET_SOCKET_TIMEOUT(sock) \
((sock != NULL) ? (sock)->sock_timeout : 0)
/*
* SSL errors.
*/
PyDoc_STRVAR(SSLError_doc,
"An error occurred in the SSL implementation.");
PyDoc_STRVAR(SSLCertVerificationError_doc,
"A certificate could not be verified.");
PyDoc_STRVAR(SSLZeroReturnError_doc,
"SSL/TLS session closed cleanly.");
PyDoc_STRVAR(SSLWantReadError_doc,
"Non-blocking SSL socket needs to read more data\n"
"before the requested operation can be completed.");
PyDoc_STRVAR(SSLWantWriteError_doc,
"Non-blocking SSL socket needs to write more data\n"
"before the requested operation can be completed.");
PyDoc_STRVAR(SSLSyscallError_doc,
"System error when attempting SSL operation.");
PyDoc_STRVAR(SSLEOFError_doc,
"SSL/TLS connection terminated abruptly.");
static PyObject *
SSLError_str(PyOSErrorObject *self)
{
if (self->strerror != NULL && PyUnicode_Check(self->strerror)) {
Py_INCREF(self->strerror);
return self->strerror;
}
else
return PyObject_Str(self->args);
}
static PyType_Slot sslerror_type_slots[] = {
{Py_tp_base, NULL}, /* Filled out in module init as it's not a constant */
{Py_tp_doc, SSLError_doc},
{Py_tp_str, SSLError_str},
{0, 0},
};
static PyType_Spec sslerror_type_spec = {
"ssl.SSLError",
sizeof(PyOSErrorObject),
0,
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
sslerror_type_slots
};
static void
fill_and_set_sslerror(PySSLSocket *sslsock, PyObject *type, int ssl_errno,
const char *errstr, int lineno, unsigned long errcode)
{
PyObject *err_value = NULL, *reason_obj = NULL, *lib_obj = NULL;
PyObject *verify_obj = NULL, *verify_code_obj = NULL;
PyObject *init_value, *msg, *key;
_Py_IDENTIFIER(reason);
_Py_IDENTIFIER(library);
_Py_IDENTIFIER(verify_message);
_Py_IDENTIFIER(verify_code);
if (errcode != 0) {
int lib, reason;
lib = ERR_GET_LIB(errcode);
reason = ERR_GET_REASON(errcode);
key = Py_BuildValue("ii", lib, reason);
if (key == NULL)
goto fail;
reason_obj = PyDict_GetItem(err_codes_to_names, key);
Py_DECREF(key);
if (reason_obj == NULL) {
/* XXX if reason < 100, it might reflect a library number (!!) */
PyErr_Clear();
}
key = PyLong_FromLong(lib);
if (key == NULL)
goto fail;
lib_obj = PyDict_GetItem(lib_codes_to_names, key);
Py_DECREF(key);
if (lib_obj == NULL) {
PyErr_Clear();
}
if (errstr == NULL)
errstr = ERR_reason_error_string(errcode);
}
if (errstr == NULL)
errstr = "unknown error";
/* verify code for cert validation error */
if ((sslsock != NULL) && (type == PySSLCertVerificationErrorObject)) {
const char *verify_str = NULL;
long verify_code;
verify_code = SSL_get_verify_result(sslsock->ssl);
verify_code_obj = PyLong_FromLong(verify_code);
if (verify_code_obj == NULL) {
goto fail;
}
switch (verify_code) {
#ifdef X509_V_ERR_HOSTNAME_MISMATCH
/* OpenSSL >= 1.0.2, LibreSSL >= 2.5.3 */
case X509_V_ERR_HOSTNAME_MISMATCH:
verify_obj = PyUnicode_FromFormat(
"Hostname mismatch, certificate is not valid for '%S'.",
sslsock->server_hostname
);
break;
#endif
#ifdef X509_V_ERR_IP_ADDRESS_MISMATCH
case X509_V_ERR_IP_ADDRESS_MISMATCH:
verify_obj = PyUnicode_FromFormat(
"IP address mismatch, certificate is not valid for '%S'.",
sslsock->server_hostname
);
break;
#endif
default:
verify_str = X509_verify_cert_error_string(verify_code);
if (verify_str != NULL) {
verify_obj = PyUnicode_FromString(verify_str);
} else {
verify_obj = Py_None;
Py_INCREF(verify_obj);
}
break;
}
if (verify_obj == NULL) {
goto fail;
}
}
if (verify_obj && reason_obj && lib_obj)
msg = PyUnicode_FromFormat("[%S: %S] %s: %S (_ssl.c:%d)",
lib_obj, reason_obj, errstr, verify_obj,
lineno);
else if (reason_obj && lib_obj)
msg = PyUnicode_FromFormat("[%S: %S] %s (_ssl.c:%d)",
lib_obj, reason_obj, errstr, lineno);
else if (lib_obj)
msg = PyUnicode_FromFormat("[%S] %s (_ssl.c:%d)",
lib_obj, errstr, lineno);
else
msg = PyUnicode_FromFormat("%s (_ssl.c:%d)", errstr, lineno);
if (msg == NULL)
goto fail;
init_value = Py_BuildValue("iN", ssl_errno, msg);
if (init_value == NULL)
goto fail;
err_value = PyObject_CallObject(type, init_value);
Py_DECREF(init_value);
if (err_value == NULL)
goto fail;
if (reason_obj == NULL)
reason_obj = Py_None;
if (_PyObject_SetAttrId(err_value, &PyId_reason, reason_obj))
goto fail;
if (lib_obj == NULL)
lib_obj = Py_None;
if (_PyObject_SetAttrId(err_value, &PyId_library, lib_obj))
goto fail;
if ((sslsock != NULL) && (type == PySSLCertVerificationErrorObject)) {
/* Only set verify code / message for SSLCertVerificationError */
if (_PyObject_SetAttrId(err_value, &PyId_verify_code,
verify_code_obj))
goto fail;
if (_PyObject_SetAttrId(err_value, &PyId_verify_message, verify_obj))
goto fail;
}
PyErr_SetObject(type, err_value);
fail:
Py_XDECREF(err_value);
Py_XDECREF(verify_code_obj);
Py_XDECREF(verify_obj);
}
static PyObject *
PySSL_SetError(PySSLSocket *sslsock, int ret, const char *filename, int lineno)
{
PyObject *type = PySSLErrorObject;
char *errstr = NULL;
int err;
enum py_ssl_error p = PY_SSL_ERROR_NONE;
unsigned long e = 0;
assert(ret <= 0);
e = ERR_peek_last_error();
if (sslsock->ssl != NULL) {
err = sslsock->ssl_errno;
switch (err) {
case SSL_ERROR_ZERO_RETURN:
errstr = "TLS/SSL connection has been closed (EOF)";
type = PySSLZeroReturnErrorObject;
p = PY_SSL_ERROR_ZERO_RETURN;
break;
case SSL_ERROR_WANT_READ:
errstr = "The operation did not complete (read)";
type = PySSLWantReadErrorObject;
p = PY_SSL_ERROR_WANT_READ;
break;
case SSL_ERROR_WANT_WRITE:
p = PY_SSL_ERROR_WANT_WRITE;
type = PySSLWantWriteErrorObject;
errstr = "The operation did not complete (write)";
break;
case SSL_ERROR_WANT_X509_LOOKUP:
p = PY_SSL_ERROR_WANT_X509_LOOKUP;
errstr = "The operation did not complete (X509 lookup)";
break;
case SSL_ERROR_WANT_CONNECT:
p = PY_SSL_ERROR_WANT_CONNECT;
errstr = "The operation did not complete (connect)";
break;
case SSL_ERROR_SYSCALL:
{
if (e == 0) {
PySocketSockObject *s = GET_SOCKET(sslsock);
if (ret == 0 || (((PyObject *)s) == Py_None)) {
p = PY_SSL_ERROR_EOF;
type = PySSLEOFErrorObject;
errstr = "EOF occurred in violation of protocol";
} else if (s && ret == -1) {
/* underlying BIO reported an I/O error */
ERR_clear_error();
#ifdef MS_WINDOWS
if (sslsock->ws_errno)
return PyErr_SetFromWindowsErr(sslsock->ws_errno);
#endif
if (sslsock->c_errno) {
errno = sslsock->c_errno;
return PyErr_SetFromErrno(PyExc_OSError);
}
Py_INCREF(s);
s->errorhandler();
Py_DECREF(s);
return NULL;
} else { /* possible? */
p = PY_SSL_ERROR_SYSCALL;
type = PySSLSyscallErrorObject;
errstr = "Some I/O error occurred";
}
} else {
p = PY_SSL_ERROR_SYSCALL;
}
break;
}
case SSL_ERROR_SSL:
{
p = PY_SSL_ERROR_SSL;
if (e == 0) {
/* possible? */
errstr = "A failure in the SSL library occurred";
}
if (ERR_GET_LIB(e) == ERR_LIB_SSL &&
ERR_GET_REASON(e) == SSL_R_CERTIFICATE_VERIFY_FAILED) {
type = PySSLCertVerificationErrorObject;
}
break;
}
default:
p = PY_SSL_ERROR_INVALID_ERROR_CODE;
errstr = "Invalid error code";
}
}
fill_and_set_sslerror(sslsock, type, p, errstr, lineno, e);
ERR_clear_error();
return NULL;
}
static PyObject *
_setSSLError (const char *errstr, int errcode, const char *filename, int lineno) {
if (errstr == NULL)
errcode = ERR_peek_last_error();
else
errcode = 0;
fill_and_set_sslerror(NULL, PySSLErrorObject, errcode, errstr, lineno, errcode);
ERR_clear_error();
return NULL;
}
/*
* SSL objects
*/
static int
_ssl_configure_hostname(PySSLSocket *self, const char* server_hostname)
{
int retval = -1;
ASN1_OCTET_STRING *ip;
PyObject *hostname;
size_t len;
assert(server_hostname);
/* Disable OpenSSL's special mode with leading dot in hostname:
* When name starts with a dot (e.g ".example.com"), it will be
* matched by a certificate valid for any sub-domain of name.
*/
len = strlen(server_hostname);
if (len == 0 || *server_hostname == '.') {
PyErr_SetString(
PyExc_ValueError,
"server_hostname cannot be an empty string or start with a "
"leading dot.");
return retval;
}
/* inet_pton is not available on all platforms. */
ip = a2i_IPADDRESS(server_hostname);
if (ip == NULL) {
ERR_clear_error();
}
hostname = PyUnicode_Decode(server_hostname, len, "idna", "strict");
if (hostname == NULL) {
goto error;
}
self->server_hostname = hostname;
/* Only send SNI extension for non-IP hostnames */
if (ip == NULL) {
if (!SSL_set_tlsext_host_name(self->ssl, server_hostname)) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
}
}
if (self->ctx->check_hostname) {
X509_VERIFY_PARAM *param = SSL_get0_param(self->ssl);
if (ip == NULL) {
if (!X509_VERIFY_PARAM_set1_host(param, server_hostname, 0)) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto error;
}
} else {
if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_data(ip),
ASN1_STRING_length(ip))) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto error;
}
}
}
retval = 0;
error:
if (ip != NULL) {
ASN1_OCTET_STRING_free(ip);
}
return retval;
}
static PySSLSocket *
newPySSLSocket(PySSLContext *sslctx, PySocketSockObject *sock,
enum py_ssl_server_or_client socket_type,
char *server_hostname,
PySSLMemoryBIO *inbio, PySSLMemoryBIO *outbio)
{
PySSLSocket *self;
SSL_CTX *ctx = sslctx->ctx;
long mode;
self = PyObject_New(PySSLSocket, &PySSLSocket_Type);
if (self == NULL)
return NULL;
self->ssl = NULL;
self->Socket = NULL;
self->ctx = sslctx;
Py_INCREF(sslctx);
self->shutdown_seen_zero = 0;
self->owner = NULL;
self->server_hostname = NULL;
self->ssl_errno = 0;
self->c_errno = 0;
#ifdef MS_WINDOWS
self->ws_errno = 0;
#endif
/* Make sure the SSL error state is initialized */
(void) ERR_get_state();
ERR_clear_error();
PySSL_BEGIN_ALLOW_THREADS
self->ssl = SSL_new(ctx);
PySSL_END_ALLOW_THREADS
SSL_set_app_data(self->ssl, self);
if (sock) {
SSL_set_fd(self->ssl, Py_SAFE_DOWNCAST(sock->sock_fd, SOCKET_T, int));
} else {
/* BIOs are reference counted and SSL_set_bio borrows our reference.
* To prevent a double free in memory_bio_dealloc() we need to take an
* extra reference here. */
BIO_up_ref(inbio->bio);
BIO_up_ref(outbio->bio);
SSL_set_bio(self->ssl, inbio->bio, outbio->bio);
}
mode = SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
#ifdef SSL_MODE_AUTO_RETRY
mode |= SSL_MODE_AUTO_RETRY;
#endif
SSL_set_mode(self->ssl, mode);
if (server_hostname != NULL) {
if (_ssl_configure_hostname(self, server_hostname) < 0) {
Py_DECREF(self);
return NULL;
}
}
/* If the socket is in non-blocking mode or timeout mode, set the BIO
* to non-blocking mode (blocking is the default)
*/
if (sock && sock->sock_timeout >= 0) {
BIO_set_nbio(SSL_get_rbio(self->ssl), 1);
BIO_set_nbio(SSL_get_wbio(self->ssl), 1);
}
PySSL_BEGIN_ALLOW_THREADS
if (socket_type == PY_SSL_CLIENT)
SSL_set_connect_state(self->ssl);
else
SSL_set_accept_state(self->ssl);
PySSL_END_ALLOW_THREADS
self->socket_type = socket_type;
if (sock != NULL) {
self->Socket = PyWeakref_NewRef((PyObject *) sock, NULL);
if (self->Socket == NULL) {
Py_DECREF(self);
return NULL;
}
}
return self;
}
/* SSL object methods */
/*[clinic input]
_ssl._SSLSocket.do_handshake
[clinic start generated code]*/
static PyObject *
_ssl__SSLSocket_do_handshake_impl(PySSLSocket *self)
/*[clinic end generated code: output=6c0898a8936548f6 input=d2d737de3df018c8]*/
{
int ret;
int err;
int sockstate, nonblocking;
PySocketSockObject *sock = GET_SOCKET(self);
_PyTime_t timeout, deadline = 0;
int has_timeout;
if (sock) {
if (((PyObject*)sock) == Py_None) {
_setSSLError("Underlying socket connection gone",
PY_SSL_ERROR_NO_SOCKET, __FILE__, __LINE__);
return NULL;
}
Py_INCREF(sock);
/* just in case the blocking state of the socket has been changed */
nonblocking = (sock->sock_timeout >= 0);
BIO_set_nbio(SSL_get_rbio(self->ssl), nonblocking);
BIO_set_nbio(SSL_get_wbio(self->ssl), nonblocking);
}
timeout = GET_SOCKET_TIMEOUT(sock);
has_timeout = (timeout > 0);
if (has_timeout)
deadline = _PyTime_GetMonotonicClock() + timeout;
/* Actually negotiate SSL connection */
/* XXX If SSL_do_handshake() returns 0, it's also a failure. */
do {
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_do_handshake(self->ssl);
_PySSL_UPDATE_ERRNO_IF(ret < 1, self, ret);
PySSL_END_ALLOW_THREADS
err = self->ssl_errno;
if (PyErr_CheckSignals())
goto error;
if (has_timeout)
timeout = deadline - _PyTime_GetMonotonicClock();
if (err == SSL_ERROR_WANT_READ) {
sockstate = PySSL_select(sock, 0, timeout);
} else if (err == SSL_ERROR_WANT_WRITE) {
sockstate = PySSL_select(sock, 1, timeout);
} else {
sockstate = SOCKET_OPERATION_OK;
}
if (sockstate == SOCKET_HAS_TIMED_OUT) {
PyErr_SetString(PySocketModule.timeout_error,
ERRSTR("The handshake operation timed out"));
goto error;
} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
PyErr_SetString(PySSLErrorObject,
ERRSTR("Underlying socket has been closed."));
goto error;
} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
PyErr_SetString(PySSLErrorObject,
ERRSTR("Underlying socket too large for select()."));
goto error;
} else if (sockstate == SOCKET_IS_NONBLOCKING) {
break;
}
} while (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE);
Py_XDECREF(sock);
if (ret < 1)
return PySSL_SetError(self, ret, __FILE__, __LINE__);
Py_RETURN_NONE;
error:
Py_XDECREF(sock);
return NULL;
}
static PyObject *
_asn1obj2py(const ASN1_OBJECT *name, int no_name)
{
char buf[X509_NAME_MAXLEN];
char *namebuf = buf;
int buflen;
PyObject *name_obj = NULL;
buflen = OBJ_obj2txt(namebuf, X509_NAME_MAXLEN, name, no_name);
if (buflen < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
return NULL;
}
/* initial buffer is too small for oid + terminating null byte */
if (buflen > X509_NAME_MAXLEN - 1) {
/* make OBJ_obj2txt() calculate the required buflen */
buflen = OBJ_obj2txt(NULL, 0, name, no_name);
/* allocate len + 1 for terminating NULL byte */
namebuf = PyMem_Malloc(buflen + 1);
if (namebuf == NULL) {
PyErr_NoMemory();
return NULL;
}
buflen = OBJ_obj2txt(namebuf, buflen + 1, name, no_name);
if (buflen < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto done;
}
}
if (!buflen && no_name) {
Py_INCREF(Py_None);
name_obj = Py_None;
}