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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 what about SSL_MODE_AUTO_RETRY?
*/
#include "Python.h"
#ifdef WITH_THREAD
#include "pythread.h"
#define PySSL_BEGIN_ALLOW_THREADS { \
PyThreadState *_save = NULL; \
if (_ssl_locks_count>0) {_save = PyEval_SaveThread();}
#define PySSL_BLOCK_THREADS if (_ssl_locks_count>0){PyEval_RestoreThread(_save)};
#define PySSL_UNBLOCK_THREADS if (_ssl_locks_count>0){_save = PyEval_SaveThread()};
#define PySSL_END_ALLOW_THREADS if (_ssl_locks_count>0){PyEval_RestoreThread(_save);} \
}
#else /* no WITH_THREAD */
#define PySSL_BEGIN_ALLOW_THREADS
#define PySSL_BLOCK_THREADS
#define PySSL_UNBLOCK_THREADS
#define PySSL_END_ALLOW_THREADS
#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_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,
PY_SSL_VERSION_SSL23,
PY_SSL_VERSION_TLS1,
};
/* Include symbols from _socket module */
#include "socketmodule.h"
#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"
/* SSL error object */
static PyObject *PySSLErrorObject;
#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
/* RAND_* APIs got added to OpenSSL in 0.9.5 */
#if OPENSSL_VERSION_NUMBER >= 0x0090500fL
# define HAVE_OPENSSL_RAND 1
#else
# undef HAVE_OPENSSL_RAND
#endif
typedef struct {
PyObject_HEAD
PySocketSockObject *Socket; /* Socket on which we're layered */
SSL_CTX* ctx;
SSL* ssl;
X509* peer_cert;
char server[X509_NAME_MAXLEN];
char issuer[X509_NAME_MAXLEN];
} PySSLObject;
static PyTypeObject PySSL_Type;
static PyObject *PySSL_SSLwrite(PySSLObject *self, PyObject *args);
static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args);
static int check_socket_and_wait_for_timeout(PySocketSockObject *s,
int writing);
static PyObject *PySSL_peercert(PySSLObject *self, PyObject *args);
static PyObject *PySSL_cipher(PySSLObject *self);
#define PySSLObject_Check(v) (Py_TYPE(v) == &PySSL_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 STRINGIFY1(x) #x
#define STRINGIFY2(x) STRINGIFY1(x)
#define ERRSTR1(x,y,z) (x ":" y ": " z)
#define ERRSTR(x) ERRSTR1("_ssl.c", STRINGIFY2(__LINE__), x)
/* XXX It might be helpful to augment the error message generated
below with the name of the SSL function that generated the error.
I expect it's obvious most of the time.
*/
static PyObject *
PySSL_SetError(PySSLObject *obj, int ret, char *filename, int lineno)
{
PyObject *v;
char buf[2048];
char *errstr;
int err;
enum py_ssl_error p = PY_SSL_ERROR_NONE;
assert(ret <= 0);
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";
p = PY_SSL_ERROR_ZERO_RETURN;
break;
case SSL_ERROR_WANT_READ:
errstr = "The operation did not complete (read)";
p = PY_SSL_ERROR_WANT_READ;
break;
case SSL_ERROR_WANT_WRITE:
p = PY_SSL_ERROR_WANT_WRITE;
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:
{
unsigned long e = ERR_get_error();
if (e == 0) {
if (ret == 0 || !obj->Socket) {
p = PY_SSL_ERROR_EOF;
errstr =
"EOF occurred in violation of protocol";
} else if (ret == -1) {
/* underlying BIO reported an I/O error */
return obj->Socket->errorhandler();
} else { /* possible? */
p = PY_SSL_ERROR_SYSCALL;
errstr = "Some I/O error occurred";
}
} else {
p = PY_SSL_ERROR_SYSCALL;
/* XXX Protected by global interpreter lock */
errstr = ERR_error_string(e, NULL);
}
break;
}
case SSL_ERROR_SSL:
{
unsigned long e = ERR_get_error();
p = PY_SSL_ERROR_SSL;
if (e != 0)
/* XXX Protected by global interpreter lock */
errstr = ERR_error_string(e, NULL);
else { /* possible? */
errstr =
"A failure in the SSL library occurred";
}
break;
}
default:
p = PY_SSL_ERROR_INVALID_ERROR_CODE;
errstr = "Invalid error code";
}
} else {
errstr = ERR_error_string(ERR_peek_last_error(), NULL);
}
PyOS_snprintf(buf, sizeof(buf), "_ssl.c:%d: %s", lineno, errstr);
v = Py_BuildValue("(is)", p, buf);
if (v != NULL) {
PyErr_SetObject(PySSLErrorObject, v);
Py_DECREF(v);
}
return NULL;
}
static PyObject *
_setSSLError (char *errstr, int errcode, char *filename, int lineno) {
char buf[2048];
PyObject *v;
if (errstr == NULL) {
errcode = ERR_peek_last_error();
errstr = ERR_error_string(errcode, NULL);
}
PyOS_snprintf(buf, sizeof(buf), "_ssl.c:%d: %s", lineno, errstr);
v = Py_BuildValue("(is)", errcode, buf);
if (v != NULL) {
PyErr_SetObject(PySSLErrorObject, v);
Py_DECREF(v);
}
return NULL;
}
static PySSLObject *
newPySSLObject(PySocketSockObject *Sock, char *key_file, char *cert_file,
enum py_ssl_server_or_client socket_type,
enum py_ssl_cert_requirements certreq,
enum py_ssl_version proto_version,
char *cacerts_file)
{
PySSLObject *self;
char *errstr = NULL;
int ret;
int verification_mode;
self = PyObject_New(PySSLObject, &PySSL_Type); /* Create new object */
if (self == NULL)
return NULL;
memset(self->server, '\0', sizeof(char) * X509_NAME_MAXLEN);
memset(self->issuer, '\0', sizeof(char) * X509_NAME_MAXLEN);
self->peer_cert = NULL;
self->ssl = NULL;
self->ctx = NULL;
self->Socket = NULL;
/* Make sure the SSL error state is initialized */
(void) ERR_get_state();
ERR_clear_error();
if ((key_file && !cert_file) || (!key_file && cert_file)) {
errstr = ERRSTR("Both the key & certificate files "
"must be specified");
goto fail;
}
if ((socket_type == PY_SSL_SERVER) &&
((key_file == NULL) || (cert_file == NULL))) {
errstr = ERRSTR("Both the key & certificate files "
"must be specified for server-side operation");
goto fail;
}
PySSL_BEGIN_ALLOW_THREADS
if (proto_version == PY_SSL_VERSION_TLS1)
self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL3)
self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL2)
self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
else if (proto_version == PY_SSL_VERSION_SSL23)
self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */
PySSL_END_ALLOW_THREADS
if (self->ctx == NULL) {
errstr = ERRSTR("Invalid SSL protocol variant specified.");
goto fail;
}
if (certreq != PY_SSL_CERT_NONE) {
if (cacerts_file == NULL) {
errstr = ERRSTR("No root certificates specified for "
"verification of other-side certificates.");
goto fail;
} else {
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_load_verify_locations(self->ctx,
cacerts_file,
NULL);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail;
}
}
}
if (key_file) {
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_use_PrivateKey_file(self->ctx, key_file,
SSL_FILETYPE_PEM);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
_setSSLError(NULL, ret, __FILE__, __LINE__);
goto fail;
}
PySSL_BEGIN_ALLOW_THREADS
ret = SSL_CTX_use_certificate_chain_file(self->ctx,
cert_file);
PySSL_END_ALLOW_THREADS
if (ret != 1) {
/*
fprintf(stderr, "ret is %d, errcode is %lu, %lu, with file \"%s\"\n",
ret, ERR_peek_error(), ERR_peek_last_error(), cert_file);
*/
if (ERR_peek_last_error() != 0) {
_setSSLError(NULL, ret, __FILE__, __LINE__);
goto fail;
}
}
}
/* ssl compatibility */
SSL_CTX_set_options(self->ctx, SSL_OP_ALL);
verification_mode = SSL_VERIFY_NONE;
if (certreq == PY_SSL_CERT_OPTIONAL)
verification_mode = SSL_VERIFY_PEER;
else if (certreq == PY_SSL_CERT_REQUIRED)
verification_mode = (SSL_VERIFY_PEER |
SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
SSL_CTX_set_verify(self->ctx, verification_mode,
NULL); /* set verify lvl */
PySSL_BEGIN_ALLOW_THREADS
self->ssl = SSL_new(self->ctx); /* New ssl struct */
PySSL_END_ALLOW_THREADS
SSL_set_fd(self->ssl, Sock->sock_fd); /* Set the socket for SSL */
/* 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_timeout >= 0.0) {
/* Set both the read and write BIO's to non-blocking mode */
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 = Sock;
Py_INCREF(self->Socket);
return self;
fail:
if (errstr)
PyErr_SetString(PySSLErrorObject, errstr);
Py_DECREF(self);
return NULL;
}
static PyObject *
PySSL_sslwrap(PyObject *self, PyObject *args)
{
PySocketSockObject *Sock;
int server_side = 0;
int verification_mode = PY_SSL_CERT_NONE;
int protocol = PY_SSL_VERSION_SSL23;
char *key_file = NULL;
char *cert_file = NULL;
char *cacerts_file = NULL;
if (!PyArg_ParseTuple(args, "O!i|zziiz:sslwrap",
PySocketModule.Sock_Type,
&Sock,
&server_side,
&key_file, &cert_file,
&verification_mode, &protocol,
&cacerts_file))
return NULL;
/*
fprintf(stderr,
"server_side is %d, keyfile %p, certfile %p, verify_mode %d, "
"protocol %d, certs %p\n",
server_side, key_file, cert_file, verification_mode,
protocol, cacerts_file);
*/
return (PyObject *) newPySSLObject(Sock, key_file, cert_file,
server_side, verification_mode,
protocol, cacerts_file);
}
PyDoc_STRVAR(ssl_doc,
"sslwrap(socket, server_side, [keyfile, certfile, certs_mode, protocol,\n"
" cacertsfile]) -> sslobject");
/* SSL object methods */
static PyObject *PySSL_SSLdo_handshake(PySSLObject *self)
{
int ret;
int err;
int sockstate;
/* Actually negotiate SSL connection */
/* XXX If SSL_do_handshake() returns 0, it's also a failure. */
sockstate = 0;
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()) {
return NULL;
}
if (err == SSL_ERROR_WANT_READ) {
sockstate = check_socket_and_wait_for_timeout(self->Socket, 0);
} else if (err == SSL_ERROR_WANT_WRITE) {
sockstate = check_socket_and_wait_for_timeout(self->Socket, 1);
} else {
sockstate = SOCKET_OPERATION_OK;
}
if (sockstate == SOCKET_HAS_TIMED_OUT) {
PyErr_SetString(PySSLErrorObject,
ERRSTR("The handshake operation timed out"));
return NULL;
} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
PyErr_SetString(PySSLErrorObject,
ERRSTR("Underlying socket has been closed."));
return NULL;
} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
PyErr_SetString(PySSLErrorObject,
ERRSTR("Underlying socket too large for select()."));
return NULL;
} else if (sockstate == SOCKET_IS_NONBLOCKING) {
break;
}
} while (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE);
if (ret < 1)
return PySSL_SetError(self, ret, __FILE__, __LINE__);
self->ssl->debug = 1;
if (self->peer_cert)
X509_free (self->peer_cert);
PySSL_BEGIN_ALLOW_THREADS
if ((self->peer_cert = SSL_get_peer_certificate(self->ssl))) {
X509_NAME_oneline(X509_get_subject_name(self->peer_cert),
self->server, X509_NAME_MAXLEN);
X509_NAME_oneline(X509_get_issuer_name(self->peer_cert),
self->issuer, X509_NAME_MAXLEN);
}
PySSL_END_ALLOW_THREADS
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
PySSL_server(PySSLObject *self)
{
return PyString_FromString(self->server);
}
static PyObject *
PySSL_issuer(PySSLObject *self)
{
return PyString_FromString(self->issuer);
}
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 = PyString_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,
PyString_AS_STRING(PyTuple_GET_ITEM(attr, 0)),
PyString_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) && (PyList_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;
}
/* 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, *t;
X509_EXTENSION *ext = NULL;
GENERAL_NAMES *names = NULL;
GENERAL_NAME *name;
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 = 0;
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 */
name = sk_GENERAL_NAME_value(names, j);
if (name->type == GEN_DIRNAME) {
/* we special-case DirName as a tuple of tuples of attributes */
t = PyTuple_New(2);
if (t == NULL) {
goto fail;
}
v = PyString_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);
} else {
/* for everything else, we use the OpenSSL print form */
(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 = PyString_FromStringAndSize(buf, (vptr - buf));
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 0, v);
v = PyString_FromStringAndSize((vptr + 1), (len - (vptr - buf + 1)));
if (v == NULL) {
Py_DECREF(t);
goto fail;
}
PyTuple_SET_ITEM(t, 1, v);
}
/* and add that rendering to the list */
if (PyList_Append(peer_alt_names, t) < 0) {
Py_DECREF(t);
goto fail;
}
Py_DECREF(t);
}
}
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;
}
fail:
if (biobuf != NULL)
BIO_free(biobuf);
if (peer_alt_names != Py_None) {
Py_XDECREF(peer_alt_names);
}
return NULL;
}
static PyObject *
_decode_certificate (X509 *certificate, int verbose) {
PyObject *retval = NULL;
BIO *biobuf = NULL;
PyObject *peer;
PyObject *peer_alt_names = NULL;
PyObject *issuer;
PyObject *version;
PyObject *sn_obj;
ASN1_INTEGER *serialNumber;
char buf[2048];
int len;
ASN1_TIME *notBefore, *notAfter;
PyObject *pnotBefore, *pnotAfter;
retval = PyDict_New();
if (retval == NULL)
return NULL;
peer = _create_tuple_for_X509_NAME(
X509_get_subject_name(certificate));
if (peer == NULL)
goto fail0;
if (PyDict_SetItemString(retval, (const char *) "subject", peer) < 0) {
Py_DECREF(peer);
goto fail0;
}
Py_DECREF(peer);
if (verbose) {
issuer = _create_tuple_for_X509_NAME(
X509_get_issuer_name(certificate));
if (issuer == NULL)
goto fail0;
if (PyDict_SetItemString(retval, (const char *)"issuer", issuer) < 0) {
Py_DECREF(issuer);
goto fail0;
}
Py_DECREF(issuer);
version = PyInt_FromLong(X509_get_version(certificate) + 1);
if (PyDict_SetItemString(retval, "version", version) < 0) {
Py_DECREF(version);
goto fail0;
}
Py_DECREF(version);
}
/* get a memory buffer */
biobuf = BIO_new(BIO_s_mem());
if (verbose) {
(void) BIO_reset(biobuf);
serialNumber = X509_get_serialNumber(certificate);
/* should not exceed 20 octets, 160 bits, so buf is big enough */
i2a_ASN1_INTEGER(biobuf, serialNumber);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
if (len < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail1;
}
sn_obj = PyString_FromStringAndSize(buf, len);
if (sn_obj == NULL)
goto fail1;
if (PyDict_SetItemString(retval, "serialNumber", sn_obj) < 0) {
Py_DECREF(sn_obj);
goto fail1;
}
Py_DECREF(sn_obj);
(void) BIO_reset(biobuf);
notBefore = X509_get_notBefore(certificate);
ASN1_TIME_print(biobuf, notBefore);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
if (len < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail1;
}
pnotBefore = PyString_FromStringAndSize(buf, len);
if (pnotBefore == NULL)
goto fail1;
if (PyDict_SetItemString(retval, "notBefore", pnotBefore) < 0) {
Py_DECREF(pnotBefore);
goto fail1;
}
Py_DECREF(pnotBefore);
}
(void) BIO_reset(biobuf);
notAfter = X509_get_notAfter(certificate);
ASN1_TIME_print(biobuf, notAfter);
len = BIO_gets(biobuf, buf, sizeof(buf)-1);
if (len < 0) {
_setSSLError(NULL, 0, __FILE__, __LINE__);
goto fail1;
}
pnotAfter = PyString_FromStringAndSize(buf, len);
if (pnotAfter == NULL)
goto fail1;
if (PyDict_SetItemString(retval, "notAfter", pnotAfter) < 0) {
Py_DECREF(pnotAfter);
goto fail1;
}
Py_DECREF(pnotAfter);
/* Now look for subjectAltName */
peer_alt_names = _get_peer_alt_names(certificate);
if (peer_alt_names == NULL)
goto fail1;
else if (peer_alt_names != Py_None) {
if (PyDict_SetItemString(retval, "subjectAltName",
peer_alt_names) < 0) {
Py_DECREF(peer_alt_names);
goto fail1;
}
Py_DECREF(peer_alt_names);
}
BIO_free(biobuf);
return retval;
fail1:
if (biobuf != NULL)
BIO_free(biobuf);
fail0:
Py_XDECREF(retval);
return NULL;
}
static PyObject *
PySSL_test_decode_certificate (PyObject *mod, PyObject *args) {
PyObject *retval = NULL;
char *filename = NULL;
X509 *x=NULL;
BIO *cert;
int verbose = 1;
if (!PyArg_ParseTuple(args, "s|i:test_decode_certificate", &filename, &verbose))
return NULL;
if ((cert=BIO_new(BIO_s_file())) == NULL) {
PyErr_SetString(PySSLErrorObject, "Can't malloc memory to read file");
goto fail0;
}
if (BIO_read_filename(cert,filename) <= 0) {
PyErr_SetString(PySSLErrorObject, "Can't open file");
goto fail0;
}
x = PEM_read_bio_X509_AUX(cert,NULL, NULL, NULL);
if (x == NULL) {
PyErr_SetString(PySSLErrorObject, "Error decoding PEM-encoded file");
goto fail0;
}
retval = _decode_certificate(x, verbose);
fail0:
if (cert != NULL) BIO_free(cert);
return retval;
}
static PyObject *
PySSL_peercert(PySSLObject *self, PyObject *args)
{
PyObject *retval = NULL;
int len;
int verification;
PyObject *binary_mode = Py_None;
if (!PyArg_ParseTuple(args, "|O:peer_certificate", &binary_mode))
return NULL;
if (!self->peer_cert)
Py_RETURN_NONE;
if (PyObject_IsTrue(binary_mode)) {
/* return cert in DER-encoded format */
unsigned char *bytes_buf = NULL;
bytes_buf = NULL;
len = i2d_X509(self->peer_cert, &bytes_buf);
if (len < 0) {
PySSL_SetError(self, len, __FILE__, __LINE__);
return NULL;
}
retval = PyString_FromStringAndSize((const char *) bytes_buf, len);
OPENSSL_free(bytes_buf);
return retval;
} else {
verification = SSL_CTX_get_verify_mode(self->ctx);
if ((verification & SSL_VERIFY_PEER) == 0)
return PyDict_New();
else