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_ssl.c
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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 ?
*/
/* Don't warn about deprecated functions, */
#ifndef OPENSSL_API_COMPAT
// 0x10101000L == 1.1.1, 30000 == 3.0.0
#define OPENSSL_API_COMPAT 0x10101000L
#endif
#define OPENSSL_NO_DEPRECATED 1
#define PY_SSIZE_T_CLEAN
#include "Python.h"
/* Include symbols from _socket module */
#include "socketmodule.h"
#ifdef MS_WINDOWS
# include <wincrypt.h>
#endif
#include "_ssl.h"
/* Redefined below for Windows debug builds after important #includes */
#define _PySSL_FIX_ERRNO
#define PySSL_BEGIN_ALLOW_THREADS_S(save) \
do { (save) = PyEval_SaveThread(); } while(0)
#define PySSL_END_ALLOW_THREADS_S(save) \
do { PyEval_RestoreThread(save); _PySSL_FIX_ERRNO; } while(0)
#define PySSL_BEGIN_ALLOW_THREADS { \
PyThreadState *_save = NULL; \
PySSL_BEGIN_ALLOW_THREADS_S(_save);
#define PySSL_END_ALLOW_THREADS PySSL_END_ALLOW_THREADS_S(_save); }
#if defined(HAVE_POLL_H)
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#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"
#include "openssl/dh.h"
#ifndef OPENSSL_THREADS
# error "OPENSSL_THREADS is not defined, Python requires thread-safe OpenSSL"
#endif
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) */
#if (OPENSSL_VERSION_NUMBER >= 0x30100000L)
#include "_ssl_data_31.h"
#elif (OPENSSL_VERSION_NUMBER >= 0x30000000L)
#include "_ssl_data_300.h"
#elif (OPENSSL_VERSION_NUMBER >= 0x10101000L) && !defined(LIBRESSL_VERSION_NUMBER)
#include "_ssl_data_111.h"
#else
#include "_ssl_data.h"
#endif
/* OpenSSL API 1.1.0+ does not include version methods */
#ifndef OPENSSL_NO_SSL3_METHOD
extern const SSL_METHOD *SSLv3_method(void);
#endif
#ifndef OPENSSL_NO_TLS1_METHOD
extern const SSL_METHOD *TLSv1_method(void);
#endif
#ifndef OPENSSL_NO_TLS1_1_METHOD
extern const SSL_METHOD *TLSv1_1_method(void);
#endif
#ifndef OPENSSL_NO_TLS1_2_METHOD
extern const SSL_METHOD *TLSv1_2_method(void);
#endif
#ifndef INVALID_SOCKET /* MS defines this */
#define INVALID_SOCKET (-1)
#endif
/* 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
#ifndef PY_SSL_MIN_PROTOCOL
#define PY_SSL_MIN_PROTOCOL TLS1_2_VERSION
#endif
#elif PY_SSL_DEFAULT_CIPHERS == 1
/* Python custom selection of sensible cipher suites
* @SECLEVEL=2: security level 2 with 112 bits minimum security (e.g. 2048 bits RSA key)
* ECDH+*: enable ephemeral elliptic curve Diffie-Hellman
* DHE+*: fallback to ephemeral finite field Diffie-Hellman
* encryption order: AES AEAD (GCM), ChaCha AEAD, AES CBC
* !aNULL:!eNULL: really no NULL ciphers
* !aDSS: no authentication with discrete logarithm DSA algorithm
* !SHA1: no weak SHA1 MAC
* !AESCCM: no CCM mode, it's uncommon and slow
*
* Based on Hynek's excellent blog post (update 2021-02-11)
* https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
*/
#define PY_SSL_DEFAULT_CIPHER_STRING "@SECLEVEL=2:ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES:DHE+AES:!aNULL:!eNULL:!aDSS:!SHA1:!AESCCM"
#ifndef PY_SSL_MIN_PROTOCOL
#define PY_SSL_MIN_PROTOCOL TLS1_2_VERSION
#endif
#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 */
PY_SSL_VERSION_TLS1,
PY_SSL_VERSION_TLS1_1,
PY_SSL_VERSION_TLS1_2,
PY_SSL_VERSION_TLS_CLIENT=0x10,
PY_SSL_VERSION_TLS_SERVER,
};
enum py_proto_version {
PY_PROTO_MINIMUM_SUPPORTED = -2,
PY_PROTO_SSLv3 = SSL3_VERSION,
PY_PROTO_TLSv1 = TLS1_VERSION,
PY_PROTO_TLSv1_1 = TLS1_1_VERSION,
PY_PROTO_TLSv1_2 = TLS1_2_VERSION,
#ifdef TLS1_3_VERSION
PY_PROTO_TLSv1_3 = TLS1_3_VERSION,
#else
PY_PROTO_TLSv1_3 = 0x304,
#endif
PY_PROTO_MAXIMUM_SUPPORTED = -1,
/* OpenSSL has no dedicated API to set the minimum version to the maximum
* available version, and the other way around. We have to figure out the
* minimum and maximum available version on our own and hope for the best.
*/
#if defined(SSL3_VERSION) && !defined(OPENSSL_NO_SSL3)
PY_PROTO_MINIMUM_AVAILABLE = PY_PROTO_SSLv3,
#elif defined(TLS1_VERSION) && !defined(OPENSSL_NO_TLS1)
PY_PROTO_MINIMUM_AVAILABLE = PY_PROTO_TLSv1,
#elif defined(TLS1_1_VERSION) && !defined(OPENSSL_NO_TLS1_1)
PY_PROTO_MINIMUM_AVAILABLE = PY_PROTO_TLSv1_1,
#elif defined(TLS1_2_VERSION) && !defined(OPENSSL_NO_TLS1_2)
PY_PROTO_MINIMUM_AVAILABLE = PY_PROTO_TLSv1_2,
#elif defined(TLS1_3_VERSION) && !defined(OPENSSL_NO_TLS1_3)
PY_PROTO_MINIMUM_AVAILABLE = PY_PROTO_TLSv1_3,
#else
#error "PY_PROTO_MINIMUM_AVAILABLE not found"
#endif
#if defined(TLS1_3_VERSION) && !defined(OPENSSL_NO_TLS1_3)
PY_PROTO_MAXIMUM_AVAILABLE = PY_PROTO_TLSv1_3,
#elif defined(TLS1_2_VERSION) && !defined(OPENSSL_NO_TLS1_2)
PY_PROTO_MAXIMUM_AVAILABLE = PY_PROTO_TLSv1_2,
#elif defined(TLS1_1_VERSION) && !defined(OPENSSL_NO_TLS1_1)
PY_PROTO_MAXIMUM_AVAILABLE = PY_PROTO_TLSv1_1,
#elif defined(TLS1_VERSION) && !defined(OPENSSL_NO_TLS1)
PY_PROTO_MAXIMUM_AVAILABLE = PY_PROTO_TLSv1,
#elif defined(SSL3_VERSION) && !defined(OPENSSL_NO_SSL3)
PY_PROTO_MAXIMUM_AVAILABLE = PY_PROTO_SSLv3,
#else
#error "PY_PROTO_MAXIMUM_AVAILABLE not found"
#endif
};
/* SSL socket object */
#define X509_NAME_MAXLEN 256
/* 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;
unsigned char *alpn_protocols;
unsigned int alpn_protocols_len;
PyObject *set_sni_cb;
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;
int protocol;
#ifdef TLS1_3_VERSION
int post_handshake_auth;
#endif
PyObject *msg_cb;
PyObject *keylog_filename;
BIO *keylog_bio;
/* Cached module state, also used in SSLSocket and SSLSession code. */
_sslmodulestate *state;
} PySSLContext;
typedef struct {
int ssl; /* last seen error from SSL */
int c; /* last seen error from libc */
#ifdef MS_WINDOWS
int ws; /* last seen error from winsock */
#endif
} _PySSLError;
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;
_PySSLError err; /* last seen error from various sources */
/* Some SSL callbacks don't have error reporting. Callback wrappers
* store exception information on the socket. The handshake, read, write,
* and shutdown methods check for chained exceptions.
*/
PyObject *exc;
} PySSLSocket;
typedef struct {
PyObject_HEAD
BIO *bio;
int eof_written;
} PySSLMemoryBIO;
typedef struct {
PyObject_HEAD
SSL_SESSION *session;
PySSLContext *ctx;
} PySSLSession;
static inline _PySSLError _PySSL_errno(int failed, const SSL *ssl, int retcode)
{
_PySSLError err = { 0 };
if (failed) {
#ifdef MS_WINDOWS
err.ws = WSAGetLastError();
_PySSL_FIX_ERRNO;
#endif
err.c = errno;
err.ssl = SSL_get_error(ssl, retcode);
}
return err;
}
/*[clinic input]
module _ssl
class _ssl._SSLContext "PySSLContext *" "get_state_type(type)->PySSLContext_Type"
class _ssl._SSLSocket "PySSLSocket *" "get_state_type(type)->PySSLSocket_Type"
class _ssl.MemoryBIO "PySSLMemoryBIO *" "get_state_type(type)->PySSLMemoryBIO_Type"
class _ssl.SSLSession "PySSLSession *" "get_state_type(type)->PySSLSession_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=d293bed8bae240fd]*/
#include "clinic/_ssl.c.h"
static int PySSL_select(PySocketSockObject *s, int writing, _PyTime_t timeout);
static int PySSL_set_owner(PySSLSocket *, PyObject *, void *);
static int PySSL_set_session(PySSLSocket *, PyObject *, void *);
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)
#include "_ssl/debughelpers.c"
/*
* 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)) {
return Py_NewRef(self->strerror);
}
else
return PyObject_Str(self->args);
}
static PyType_Slot sslerror_type_slots[] = {
{Py_tp_doc, (void*)SSLError_doc},
{Py_tp_str, SSLError_str},
{0, 0},
};
static PyType_Spec sslerror_type_spec = {
.name = "ssl.SSLError",
.basicsize = sizeof(PyOSErrorObject),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_IMMUTABLETYPE),
.slots = sslerror_type_slots
};
static void
fill_and_set_sslerror(_sslmodulestate *state,
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;
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_GetItemWithError(state->err_codes_to_names, key);
Py_DECREF(key);
if (reason_obj == NULL && PyErr_Occurred()) {
goto fail;
}
key = PyLong_FromLong(lib);
if (key == NULL)
goto fail;
lib_obj = PyDict_GetItemWithError(state->lib_codes_to_names, key);
Py_DECREF(key);
if (lib_obj == NULL && PyErr_Occurred()) {
goto fail;
}
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 == state->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) {
case X509_V_ERR_HOSTNAME_MISMATCH:
verify_obj = PyUnicode_FromFormat(
"Hostname mismatch, certificate is not valid for '%S'.",
sslsock->server_hostname
);
break;
case X509_V_ERR_IP_ADDRESS_MISMATCH:
verify_obj = PyUnicode_FromFormat(
"IP address mismatch, certificate is not valid for '%S'.",
sslsock->server_hostname
);
break;
default:
verify_str = X509_verify_cert_error_string(verify_code);
if (verify_str != NULL) {
verify_obj = PyUnicode_FromString(verify_str);
} else {
verify_obj = Py_NewRef(Py_None);
}
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", ERR_GET_REASON(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_SetAttr(err_value, state->str_reason, reason_obj))
goto fail;
if (lib_obj == NULL)
lib_obj = Py_None;
if (PyObject_SetAttr(err_value, state->str_library, lib_obj))
goto fail;
if ((sslsock != NULL) && (type == state->PySSLCertVerificationErrorObject)) {
/* Only set verify code / message for SSLCertVerificationError */
if (PyObject_SetAttr(err_value, state->str_verify_code,
verify_code_obj))
goto fail;
if (PyObject_SetAttr(err_value, state->str_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 int
PySSL_ChainExceptions(PySSLSocket *sslsock) {
if (sslsock->exc == NULL)
return 0;
_PyErr_ChainExceptions1(sslsock->exc);
sslsock->exc = NULL;
return -1;
}
static PyObject *
PySSL_SetError(PySSLSocket *sslsock, int ret, const char *filename, int lineno)
{
PyObject *type;
char *errstr = NULL;
_PySSLError err;
enum py_ssl_error p = PY_SSL_ERROR_NONE;
unsigned long e = 0;
assert(sslsock != NULL);
_sslmodulestate *state = get_state_sock(sslsock);
type = state->PySSLErrorObject;
assert(ret <= 0);
e = ERR_peek_last_error();
if (sslsock->ssl != NULL) {
err = sslsock->err;
switch (err.ssl) {
case SSL_ERROR_ZERO_RETURN:
errstr = "TLS/SSL connection has been closed (EOF)";
type = state->PySSLZeroReturnErrorObject;
p = PY_SSL_ERROR_ZERO_RETURN;
break;
case SSL_ERROR_WANT_READ:
errstr = "The operation did not complete (read)";
type = state->PySSLWantReadErrorObject;
p = PY_SSL_ERROR_WANT_READ;
break;
case SSL_ERROR_WANT_WRITE:
p = PY_SSL_ERROR_WANT_WRITE;
type = state->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 = state->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 (err.ws) {
return PyErr_SetFromWindowsErr(err.ws);
}
#endif
if (err.c) {
errno = err.c;
return PyErr_SetFromErrno(PyExc_OSError);
}
else {
p = PY_SSL_ERROR_EOF;
type = state->PySSLEOFErrorObject;
errstr = "EOF occurred in violation of protocol";
}
} else { /* possible? */
p = PY_SSL_ERROR_SYSCALL;
type = state->PySSLSyscallErrorObject;
errstr = "Some I/O error occurred";
}
} else {
if (ERR_GET_LIB(e) == ERR_LIB_SSL &&
ERR_GET_REASON(e) == SSL_R_CERTIFICATE_VERIFY_FAILED) {
type = state->PySSLCertVerificationErrorObject;
}
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 = state->PySSLCertVerificationErrorObject;
}
#if defined(SSL_R_UNEXPECTED_EOF_WHILE_READING)
/* OpenSSL 3.0 changed transport EOF from SSL_ERROR_SYSCALL with
* zero return value to SSL_ERROR_SSL with a special error code. */
if (ERR_GET_LIB(e) == ERR_LIB_SSL &&
ERR_GET_REASON(e) == SSL_R_UNEXPECTED_EOF_WHILE_READING) {
p = PY_SSL_ERROR_EOF;
type = state->PySSLEOFErrorObject;
errstr = "EOF occurred in violation of protocol";
}
#endif
break;
}
default:
p = PY_SSL_ERROR_INVALID_ERROR_CODE;
errstr = "Invalid error code";
}
}
fill_and_set_sslerror(state, sslsock, type, p, errstr, lineno, e);
ERR_clear_error();
PySSL_ChainExceptions(sslsock);
return NULL;
}
static PyObject *
_setSSLError (_sslmodulestate *state, 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(state, NULL, state->PySSLErrorObject, errcode, errstr, lineno, errcode);
ERR_clear_error();
return NULL;
}
static int
_ssl_deprecated(const char* msg, int stacklevel) {
return PyErr_WarnEx(
PyExc_DeprecationWarning, msg, stacklevel
);
}
#define PY_SSL_DEPRECATED(name, stacklevel, ret) \
if (_ssl_deprecated((name), (stacklevel)) == -1) return (ret)
/*
* 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, "ascii", "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(get_state_sock(self), NULL, 0, __FILE__, __LINE__);
goto error;
}
}
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,
strlen(server_hostname))) {
_setSSLError(get_state_sock(self), NULL, 0, __FILE__, __LINE__);
goto error;
}
} else {
if (!X509_VERIFY_PARAM_set1_ip(param, ASN1_STRING_get0_data(ip),
ASN1_STRING_length(ip))) {
_setSSLError(get_state_sock(self), 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,
PyObject *owner, PyObject *session,
PySSLMemoryBIO *inbio, PySSLMemoryBIO *outbio)
{
PySSLSocket *self;
SSL_CTX *ctx = sslctx->ctx;
_PySSLError err = { 0 };
if ((socket_type == PY_SSL_SERVER) &&
(sslctx->protocol == PY_SSL_VERSION_TLS_CLIENT)) {
_setSSLError(get_state_ctx(sslctx),
"Cannot create a server socket with a "
"PROTOCOL_TLS_CLIENT context", 0, __FILE__, __LINE__);
return NULL;
}
if ((socket_type == PY_SSL_CLIENT) &&
(sslctx->protocol == PY_SSL_VERSION_TLS_SERVER)) {
_setSSLError(get_state_ctx(sslctx),
"Cannot create a client socket with a "
"PROTOCOL_TLS_SERVER context", 0, __FILE__, __LINE__);
return NULL;
}
self = PyObject_GC_New(PySSLSocket,
get_state_ctx(sslctx)->PySSLSocket_Type);
if (self == NULL)
return NULL;
self->ssl = NULL;
self->Socket = NULL;
self->ctx = (PySSLContext*)Py_NewRef(sslctx);
self->shutdown_seen_zero = 0;
self->owner = NULL;
self->server_hostname = NULL;
self->err = err;
self->exc = NULL;
/* Make sure the SSL error state is initialized */
ERR_clear_error();
PySSL_BEGIN_ALLOW_THREADS
self->ssl = SSL_new(ctx);
PySSL_END_ALLOW_THREADS
if (self->ssl == NULL) {
Py_DECREF(self);
_setSSLError(get_state_ctx(self), NULL, 0, __FILE__, __LINE__);
return NULL;
}
/* bpo43522 and OpenSSL < 1.1.1l: copy hostflags manually */
#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION < 0x101010cf
X509_VERIFY_PARAM *ssl_params = SSL_get0_param(self->ssl);
X509_VERIFY_PARAM_set_hostflags(ssl_params, sslctx->hostflags);
#endif
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);
}
SSL_set_mode(self->ssl,
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_AUTO_RETRY);
#ifdef TLS1_3_VERSION
if (sslctx->post_handshake_auth == 1) {
if (socket_type == PY_SSL_SERVER) {
/* bpo-37428: OpenSSL does not ignore SSL_VERIFY_POST_HANDSHAKE.
* Set SSL_VERIFY_POST_HANDSHAKE flag only for server sockets and
* only in combination with SSL_VERIFY_PEER flag. */
int mode = SSL_get_verify_mode(self->ssl);
if (mode & SSL_VERIFY_PEER) {
int (*verify_cb)(int, X509_STORE_CTX *) = NULL;
verify_cb = SSL_get_verify_callback(self->ssl);
mode |= SSL_VERIFY_POST_HANDSHAKE;
SSL_set_verify(self->ssl, mode, verify_cb);
}
} else {
/* client socket */
SSL_set_post_handshake_auth(self->ssl, 1);
}
}
#endif
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;
}
}
if (owner && owner != Py_None) {
if (PySSL_set_owner(self, owner, NULL) == -1) {
Py_DECREF(self);
return NULL;
}
}
if (session && session != Py_None) {
if (PySSL_set_session(self, session, NULL) == -1) {
Py_DECREF(self);
return NULL;
}
}
PyObject_GC_Track(self);
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;
_PySSLError 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(get_state_sock(self),
"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 = _PyDeadline_Init(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);
err = _PySSL_errno(ret < 1, self->ssl, ret);
PySSL_END_ALLOW_THREADS
self->err = err;
if (PyErr_CheckSignals())
goto error;
if (has_timeout)
timeout = _PyDeadline_Get(deadline);
if (err.ssl == SSL_ERROR_WANT_READ) {
sockstate = PySSL_select(sock, 0, timeout);
} else if (err.ssl == SSL_ERROR_WANT_WRITE) {
sockstate = PySSL_select(sock, 1, timeout);
} else {
sockstate = SOCKET_OPERATION_OK;
}
if (sockstate == SOCKET_HAS_TIMED_OUT) {
PyErr_SetString(PyExc_TimeoutError,
ERRSTR("The handshake operation timed out"));
goto error;
} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
PyErr_SetString(get_state_sock(self)->PySSLErrorObject,
ERRSTR("Underlying socket has been closed."));
goto error;
} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
PyErr_SetString(get_state_sock(self)->PySSLErrorObject,
ERRSTR("Underlying socket too large for select()."));
goto error;
} else if (sockstate == SOCKET_IS_NONBLOCKING) {
break;
}
} while (err.ssl == SSL_ERROR_WANT_READ ||
err.ssl == SSL_ERROR_WANT_WRITE);
Py_XDECREF(sock);
if (ret < 1)
return PySSL_SetError(self, ret, __FILE__, __LINE__);