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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 ?
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#ifdef WITH_THREAD
#include "pythread.h"
#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); } } 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); }
#else /* no WITH_THREAD */
#define PySSL_BEGIN_ALLOW_THREADS_S(save)
#define PySSL_END_ALLOW_THREADS_S(save)
#define PySSL_BEGIN_ALLOW_THREADS
#define PySSL_BLOCK_THREADS
#define PySSL_UNBLOCK_THREADS
#define PySSL_END_ALLOW_THREADS
#endif
/* 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
/* 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"
/* SSL error object */
static PyObject *PySSLErrorObject;
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;
};
/* Include generated data (error codes) */
#include "_ssl_data.h"
/* 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
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_SSL23,
#if HAVE_TLSv1_2
PY_SSL_VERSION_TLS1,
PY_SSL_VERSION_TLS1_1,
PY_SSL_VERSION_TLS1_2
#else
PY_SSL_VERSION_TLS1
#endif
};
#ifdef WITH_THREAD
/* 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;
#endif /* def WITH_THREAD */
/* 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;
#ifdef OPENSSL_NPN_NEGOTIATED
unsigned char *npn_protocols;
int npn_protocols_len;
#endif
#ifdef HAVE_ALPN
unsigned char *alpn_protocols;
int alpn_protocols_len;
#endif
#ifndef OPENSSL_NO_TLSEXT
PyObject *set_hostname;
#endif
int check_hostname;
} PySSLContext;
typedef struct {
PyObject_HEAD
PyObject *Socket; /* weakref to socket on which we're layered */
SSL *ssl;
PySSLContext *ctx; /* weakref to SSL context */
X509 *peer_cert;
char shutdown_seen_zero;
char handshake_done;
enum py_ssl_server_or_client socket_type;
PyObject *owner; /* Python level "owner" passed to servername callback */
PyObject *server_hostname;
} PySSLSocket;
typedef struct {
PyObject_HEAD
BIO *bio;
int eof_written;
} PySSLMemoryBIO;
static PyTypeObject PySSLContext_Type;
static PyTypeObject PySSLSocket_Type;
static PyTypeObject PySSLMemoryBIO_Type;
/*[clinic input]
module _ssl
class _ssl._SSLContext "PySSLContext *" "&PySSLContext_Type"
class _ssl._SSLSocket "PySSLSocket *" "&PySSLSocket_Type"
class _ssl.MemoryBIO "PySSLMemoryBIO *" "&PySSLMemoryBIO_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=7bf7cb832638e2e1]*/
#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)
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(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(PyObject *type, int ssl_errno, const char *errstr,
int lineno, unsigned long errcode)
{
PyObject *err_value = NULL, *reason_obj = NULL, *lib_obj = NULL;
PyObject *init_value, *msg, *key;
_Py_IDENTIFIER(reason);
_Py_IDENTIFIER(library);
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";
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;
PyErr_SetObject(type, err_value);
fail:
Py_XDECREF(err_value);
}
static PyObject *
PySSL_SetError(PySSLSocket *obj, 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 (obj->ssl != NULL) {
err = SSL_get_error(obj->ssl, ret);
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(obj);
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 */
Py_INCREF(s);
ERR_clear_error();
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";
break;
}
default:
p = PY_SSL_ERROR_INVALID_ERROR_CODE;
errstr = "Invalid error code";
}
}
fill_and_set_sslerror(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(PySSLErrorObject, errcode, errstr, lineno, errcode);
ERR_clear_error();
return NULL;
}
/*
* SSL objects
*/
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;
PyObject *hostname;
long mode;
self = PyObject_New(PySSLSocket, &PySSLSocket_Type);
if (self == NULL)
return NULL;
self->peer_cert = NULL;
self->ssl = NULL;
self->Socket = NULL;
self->ctx = sslctx;
self->shutdown_seen_zero = 0;
self->handshake_done = 0;
self->owner = NULL;
if (server_hostname != NULL) {
hostname = PyUnicode_Decode(server_hostname, strlen(server_hostname),
"idna", "strict");
if (hostname == NULL) {
Py_DECREF(self);
return NULL;
}
self->server_hostname = hostname;
} else
self->server_hostname = NULL;
Py_INCREF(sslctx);
/* 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. */
CRYPTO_add(&inbio->bio->references, 1, CRYPTO_LOCK_BIO);
CRYPTO_add(&outbio->bio->references, 1, CRYPTO_LOCK_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 HAVE_SNI
if (server_hostname != NULL)
SSL_set_tlsext_host_name(self->ssl, server_hostname);
#endif
/* 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);
Py_XDECREF(self->server_hostname);
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);
err = SSL_get_error(self->ssl, ret);
PySSL_END_ALLOW_THREADS
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__);
if (self->peer_cert)
X509_free (self->peer_cert);
PySSL_BEGIN_ALLOW_THREADS
self->peer_cert = SSL_get_peer_certificate(self->ssl);
PySSL_END_ALLOW_THREADS
self->handshake_done = 1;
Py_INCREF(Py_None);
return Py_None;
error:
Py_XDECREF(sock);
return NULL;
}
static PyObject *
_create_tuple_for_attribute (ASN1_OBJECT *name, ASN1_STRING *value) {
char namebuf[X509_NAME_MAXLEN];
int buflen;
PyObject *name_obj;
PyObject *value_obj;
PyObject *attr;
unsigned char *valuebuf = NULL;
buflen = OBJ_obj2txt(namebuf, sizeof(namebuf), name, 0);
if (buflen < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail;
}
name_obj = PyUnicode_FromStringAndSize(namebuf, buflen);
if (name_obj == NULL)
goto fail;
buflen = ASN1_STRING_to_UTF8(&valuebuf, value);
if (buflen < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
Py_DECREF(name_obj);
goto fail;
}
value_obj = PyUnicode_DecodeUTF8((char *) valuebuf,
buflen, "strict");
OPENSSL_free(valuebuf);
if (value_obj == NULL) {
Py_DECREF(name_obj);
goto fail;
}
attr = PyTuple_New(2);
if (attr == NULL) {
Py_DECREF(name_obj);
Py_DECREF(value_obj);
goto fail;
}
PyTuple_SET_ITEM(attr, 0, name_obj);
PyTuple_SET_ITEM(attr, 1, value_obj);
return attr;
fail:
return NULL;
}
static PyObject *
_create_tuple_for_X509_NAME (X509_NAME *xname)
{
PyObject *dn = NULL; /* tuple which represents the "distinguished name" */
PyObject *rdn = NULL; /* tuple to hold a "relative distinguished name" */
PyObject *rdnt;
PyObject *attr = NULL; /* tuple to hold an attribute */
int entry_count = X509_NAME_entry_count(xname);
X509_NAME_ENTRY *entry;
ASN1_OBJECT *name;
ASN1_STRING *value;
int index_counter;
int rdn_level = -1;
int retcode;
dn = PyList_New(0);
if (dn == NULL)
return NULL;
/* now create another tuple to hold the top-level RDN */
rdn = PyList_New(0);
if (rdn == NULL)
goto fail0;
for (index_counter = 0;
index_counter < entry_count;
index_counter++)
{
entry = X509_NAME_get_entry(xname, index_counter);
/* check to see if we've gotten to a new RDN */
if (rdn_level >= 0) {
if (rdn_level != entry->set) {
/* yes, new RDN */
/* add old RDN to DN */
rdnt = PyList_AsTuple(rdn);
Py_DECREF(rdn);
if (rdnt == NULL)
goto fail0;
retcode = PyList_Append(dn, rdnt);
Py_DECREF(rdnt);
if (retcode < 0)
goto fail0;
/* create new RDN */
rdn = PyList_New(0);
if (rdn == NULL)
goto fail0;
}
}
rdn_level = entry->set;
/* now add this attribute to the current RDN */
name = X509_NAME_ENTRY_get_object(entry);
value = X509_NAME_ENTRY_get_data(entry);
attr = _create_tuple_for_attribute(name, value);
/*
fprintf(stderr, "RDN level %d, attribute %s: %s\n",
entry->set,
PyBytes_AS_STRING(PyTuple_GET_ITEM(attr, 0)),
PyBytes_AS_STRING(PyTuple_GET_ITEM(attr, 1)));
*/
if (attr == NULL)
goto fail1;
retcode = PyList_Append(rdn, attr);
Py_DECREF(attr);
if (retcode < 0)
goto fail1;
}
/* now, there's typically a dangling RDN */
if (rdn != NULL) {
if (PyList_GET_SIZE(rdn) > 0) {
rdnt = PyList_AsTuple(rdn);
Py_DECREF(rdn);
if (rdnt == NULL)
goto fail0;
retcode = PyList_Append(dn, rdnt);
Py_DECREF(rdnt);
if (retcode < 0)
goto fail0;
}
else {
Py_DECREF(rdn);
}
}
/* convert list to tuple */
rdnt = PyList_AsTuple(dn);
Py_DECREF(dn);
if (rdnt == NULL)
return NULL;
return rdnt;
fail1:
Py_XDECREF(rdn);
fail0:
Py_XDECREF(dn);
return NULL;
}
static PyObject *
_get_peer_alt_names (X509 *certificate) {
/* this code follows the procedure outlined in
OpenSSL's crypto/x509v3/v3_prn.c:X509v3_EXT_print()
function to extract the STACK_OF(GENERAL_NAME),
then iterates through the stack to add the
names. */
int i, j;
PyObject *peer_alt_names = Py_None;
PyObject *v = NULL, *t;
X509_EXTENSION *ext = NULL;
GENERAL_NAMES *names = NULL;
GENERAL_NAME *name;
const X509V3_EXT_METHOD *method;
BIO *biobuf = NULL;
char buf[2048];
char *vptr;
int len;
const unsigned char *p;
if (certificate == NULL)
return peer_alt_names;
/* get a memory buffer */
biobuf = BIO_new(BIO_s_mem());
i = -1;
while ((i = X509_get_ext_by_NID(
certificate, NID_subject_alt_name, i)) >= 0) {
if (peer_alt_names == Py_None) {
peer_alt_names = PyList_New(0);
if (peer_alt_names == NULL)
goto fail;
}
/* now decode the altName */
ext = X509_get_ext(certificate, i);
if(!(method = X509V3_EXT_get(ext))) {
PyErr_SetString
(PySSLErrorObject,
ERRSTR("No method for internalizing subjectAltName!"));
goto fail;
}
p = ext->value->data;
if (method->it)
names = (GENERAL_NAMES*)
(ASN1_item_d2i(NULL,
&p,
ext->value->length,
ASN1_ITEM_ptr(method->it)));
else
names = (GENERAL_NAMES*)
(method->d2i(NULL,
&p,
ext->value->length));
for(j = 0; j < sk_GENERAL_NAME_num(names); j++) {
/* get a rendering of each name in the set of names */
int gntype;
ASN1_STRING *as = NULL;
name = sk_GENERAL_NAME_value(names, j);
gntype = name->type;
switch (gntype) {
case GEN_DIRNAME:
/* we special-case DirName as a tuple of
tuples of attributes */
t = PyTuple_New(2);
if (t == NULL) {
goto fail;
}
v = PyUnicode_FromString("DirName");
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 0, v);
v = _create_tuple_for_X509_NAME (name->d.dirn);
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
break;
case GEN_EMAIL:
case GEN_DNS:
case GEN_URI:
/* GENERAL_NAME_print() doesn't handle NULL bytes in ASN1_string
correctly, CVE-2013-4238 */
t = PyTuple_New(2);
if (t == NULL)
goto fail;
switch (gntype) {
case GEN_EMAIL:
v = PyUnicode_FromString("email");
as = name->d.rfc822Name;
break;
case GEN_DNS:
v = PyUnicode_FromString("DNS");
as = name->d.dNSName;
break;
case GEN_URI:
v = PyUnicode_FromString("URI");
as = name->d.uniformResourceIdentifier;
break;
}
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 0, v);
v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_data(as),
ASN1_STRING_length(as));
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
break;
default:
/* for everything else, we use the OpenSSL print form */
switch (gntype) {
/* check for new general name type */
case GEN_OTHERNAME:
case GEN_X400:
case GEN_EDIPARTY:
case GEN_IPADD:
case GEN_RID:
break;
default:
if (PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
"Unknown general name type %d",
gntype) == -1) {
goto fail;
}
break;
}
(void) BIO_reset(biobuf);
GENERAL_NAME_print(biobuf, name);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
if (len < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail;
}
vptr = strchr(buf, ':');
if (vptr == NULL)
goto fail;
t = PyTuple_New(2);
if (t == NULL)
goto fail;
v = PyUnicode_FromStringAndSize(buf, (vptr - buf));
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 0, v);
v = PyUnicode_FromStringAndSize((vptr + 1),
(len - (vptr - buf + 1)));
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
break;
}
/* and add that rendering to the list */
if (PyList_Append(peer_alt_names, t) < 0) {
Py_DECREF(t);
goto fail;
}
Py_DECREF(t);
}
sk_GENERAL_NAME_pop_free(names, GENERAL_NAME_free);
}
BIO_free(biobuf);
if (peer_alt_names != Py_None) {
v = PyList_AsTuple(peer_alt_names);
Py_DECREF(peer_alt_names);
return v;
} else {
return peer_alt_names;
}