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gh-111178: fix UBSan failures in Modules/_ssl.c #130719

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Merged
merged 10 commits into from
Mar 17, 2025
Merged

gh-111178: fix UBSan failures in Modules/_ssl.c #130719

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801a41c
fix UBSan failures for `PySSLContext`
picnixz Feb 8, 2025
e1c5020
fix UBSan failures for `PySSLSocket`
picnixz Feb 8, 2025
e101a98
fix UBSan failures for `PySSLMemoryBIO`
picnixz Feb 8, 2025
d734c1e
fix UBSan failures for `PySSLSession`
picnixz Feb 8, 2025
fe9f918
Do not use `_` + capital letter in cast macros as it is also UB.
picnixz Feb 8, 2025
9a88242
Merge remote-tracking branch 'upstream/main' into fix/ubsan/ssl-111178
picnixz Mar 1, 2025
58d5d42
Merge remote-tracking branch 'upstream/main' into fix/ubsan/ssl-111178
picnixz Mar 1, 2025
62cfada
Assume (and then assert, a bit too late) that left is of the right type
encukou Mar 5, 2025
dc0a521
Victor's review (part 1)
picnixz Mar 16, 2025
9a4079c
Update Modules/_ssl.c
picnixz Mar 16, 2025
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74 changes: 48 additions & 26 deletions Modules/_ssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -312,6 +312,8 @@ typedef struct {
#endif
} PySSLContext;

#define PySSLContext_CAST(op) ((PySSLContext *)(op))

typedef struct {
int ssl; /* last seen error from SSL */
int c; /* last seen error from libc */
Expand All @@ -337,18 +339,24 @@ typedef struct {
PyObject *exc;
} PySSLSocket;

#define PySSLSocket_CAST(op) ((PySSLSocket *)(op))

typedef struct {
PyObject_HEAD
BIO *bio;
int eof_written;
} PySSLMemoryBIO;

#define PySSLMemoryBIO_CAST(op) ((PySSLMemoryBIO *)(op))

typedef struct {
PyObject_HEAD
SSL_SESSION *session;
PySSLContext *ctx;
} PySSLSession;

#define PySSLSession_CAST(op) ((PySSLSession *)(op))

static inline _PySSLError _PySSL_errno(int failed, const SSL *ssl, int retcode)
{
_PySSLError err = { 0 };
Expand Down Expand Up @@ -2317,23 +2325,26 @@ _ssl__SSLSocket_owner_set_impl(PySSLSocket *self, PyObject *value)
}

static int
PySSL_traverse(PySSLSocket *self, visitproc visit, void *arg)
PySSL_traverse(PyObject *op, visitproc visit, void *arg)
{
PySSLSocket *self = PySSLSocket_CAST(op);
Py_VISIT(self->exc);
Py_VISIT(Py_TYPE(self));
return 0;
}

static int
PySSL_clear(PySSLSocket *self)
PySSL_clear(PyObject *op)
{
PySSLSocket *self = PySSLSocket_CAST(op);
Py_CLEAR(self->exc);
return 0;
}

static void
PySSL_dealloc(PySSLSocket *self)
PySSL_dealloc(PyObject *op)
{
PySSLSocket *self = PySSLSocket_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
if (self->ssl) {
Expand Down Expand Up @@ -3278,17 +3289,19 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
}

static int
context_traverse(PySSLContext *self, visitproc visit, void *arg)
context_traverse(PyObject *op, visitproc visit, void *arg)
{
PySSLContext *self = PySSLContext_CAST(op);
Py_VISIT(self->set_sni_cb);
Py_VISIT(self->msg_cb);
Py_VISIT(Py_TYPE(self));
return 0;
}

static int
context_clear(PySSLContext *self)
context_clear(PyObject *op)
{
PySSLContext *self = PySSLContext_CAST(op);
Py_CLEAR(self->set_sni_cb);
Py_CLEAR(self->msg_cb);
Py_CLEAR(self->keylog_filename);
Expand All @@ -3306,15 +3319,16 @@ context_clear(PySSLContext *self)
}

static void
context_dealloc(PySSLContext *self)
context_dealloc(PyObject *op)
{
PySSLContext *self = PySSLContext_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyObject_GC_UnTrack(self);
context_clear(self);
(void)context_clear(op);
SSL_CTX_free(self->ctx);
PyMem_FREE(self->alpn_protocols);
Py_TYPE(self)->tp_free(self);
tp->tp_free(self);
Py_DECREF(tp);
}

Expand Down Expand Up @@ -3908,7 +3922,9 @@ _ssl__SSLContext_check_hostname_set_impl(PySSLContext *self, PyObject *value)
}

static PyObject *
get_post_handshake_auth(PySSLContext *self, void *c) {
get_post_handshake_auth(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
#if defined(PySSL_HAVE_POST_HS_AUTH)
return PyBool_FromLong(self->post_handshake_auth);
#else
Expand All @@ -3918,7 +3934,9 @@ get_post_handshake_auth(PySSLContext *self, void *c) {

#if defined(PySSL_HAVE_POST_HS_AUTH)
static int
set_post_handshake_auth(PySSLContext *self, PyObject *arg, void *c) {
set_post_handshake_auth(PyObject *op, PyObject *arg, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (arg == NULL) {
PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
return -1;
Expand Down Expand Up @@ -5197,18 +5215,18 @@ static PyGetSetDef context_getsetlist[] = {
_SSL__SSLCONTEXT__HOST_FLAGS_GETSETDEF
_SSL__SSLCONTEXT_MINIMUM_VERSION_GETSETDEF
_SSL__SSLCONTEXT_MAXIMUM_VERSION_GETSETDEF
{"keylog_filename", (getter) _PySSLContext_get_keylog_filename,
(setter) _PySSLContext_set_keylog_filename, NULL},
{"_msg_callback", (getter) _PySSLContext_get_msg_callback,
(setter) _PySSLContext_set_msg_callback, NULL},
{"keylog_filename", _PySSLContext_get_keylog_filename,
_PySSLContext_set_keylog_filename, NULL},
{"_msg_callback", _PySSLContext_get_msg_callback,
_PySSLContext_set_msg_callback, NULL},
_SSL__SSLCONTEXT_SNI_CALLBACK_GETSETDEF
#if defined(TLS1_3_VERSION) && !defined(OPENSSL_NO_TLS1_3)
_SSL__SSLCONTEXT_NUM_TICKETS_GETSETDEF
#endif
_SSL__SSLCONTEXT_OPTIONS_GETSETDEF
{"post_handshake_auth", (getter) get_post_handshake_auth,
{"post_handshake_auth", get_post_handshake_auth,
#if defined(PySSL_HAVE_POST_HS_AUTH)
(setter) set_post_handshake_auth,
set_post_handshake_auth,
#else
NULL,
#endif
Expand Down Expand Up @@ -5300,19 +5318,20 @@ _ssl_MemoryBIO_impl(PyTypeObject *type)
}

static int
memory_bio_traverse(PySSLMemoryBIO *self, visitproc visit, void *arg)
memory_bio_traverse(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
}

static void
memory_bio_dealloc(PySSLMemoryBIO *self)
memory_bio_dealloc(PyObject *op)
{
PySSLMemoryBIO *self = PySSLMemoryBIO_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
BIO_free(self->bio);
Py_TYPE(self)->tp_free(self);
(void)BIO_free(self->bio);
tp->tp_free(self);
Py_DECREF(tp);
}

Expand Down Expand Up @@ -5492,8 +5511,9 @@ static PyType_Spec PySSLMemoryBIO_spec = {
*/

static void
PySSLSession_dealloc(PySSLSession *self)
PySSLSession_dealloc(PyObject *op)
{
PySSLSession *self = PySSLSession_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyObject_GC_UnTrack(self);
Expand All @@ -5514,7 +5534,7 @@ PySSLSession_richcompare(PyObject *left, PyObject *right, int op)
}

int result;
PyTypeObject *sesstype = ((PySSLSession*)left)->ctx->state->PySSLSession_Type;
PyTypeObject *sesstype = PySSLSession_CAST(left)->ctx->state->PySSLSession_Type;

if (!Py_IS_TYPE(left, sesstype) || !Py_IS_TYPE(right, sesstype)) {
Py_RETURN_NOTIMPLEMENTED;
Expand All @@ -5525,9 +5545,9 @@ PySSLSession_richcompare(PyObject *left, PyObject *right, int op)
} else {
const unsigned char *left_id, *right_id;
unsigned int left_len, right_len;
left_id = SSL_SESSION_get_id(((PySSLSession *)left)->session,
left_id = SSL_SESSION_get_id(PySSLSession_CAST(left)->session,
&left_len);
right_id = SSL_SESSION_get_id(((PySSLSession *)right)->session,
right_id = SSL_SESSION_get_id(PySSLSession_CAST(right)->session,
&right_len);
if (left_len == right_len) {
result = memcmp(left_id, right_id, left_len);
Expand Down Expand Up @@ -5564,16 +5584,18 @@ PySSLSession_richcompare(PyObject *left, PyObject *right, int op)
}

static int
PySSLSession_traverse(PySSLSession *self, visitproc visit, void *arg)
PySSLSession_traverse(PyObject *op, visitproc visit, void *arg)
{
PySSLSession *self = PySSLSession_CAST(op);
Py_VISIT(self->ctx);
Py_VISIT(Py_TYPE(self));
return 0;
}

static int
PySSLSession_clear(PySSLSession *self)
PySSLSession_clear(PyObject *op)
{
PySSLSession *self = PySSLSession_CAST(op);
Py_CLEAR(self->ctx);
return 0;
}
Expand Down
10 changes: 5 additions & 5 deletions Modules/_ssl/cert.c
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Original file line number Diff line number Diff line change
Expand Up @@ -153,13 +153,13 @@ _x509name_print(_sslmodulestate *state, X509_NAME *name, int indent, unsigned lo
* PySSLCertificate_Type
*/

#define _PySSLCertificate_CAST(op) ((PySSLCertificate *)(op))
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I don't thinkt that this change is useful.

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I think I myself did the change and I at that time put an underscore. But considering I used the convention "objectname+_CAST" for the series of PR and that I amended some changes I've done recently I think we can refactor this one as well (if the code is however not by me and/or is older, I can revert that change)

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Note: it's something I've changed last month, and I thought I fixed all the UBSan issues in the SSL module but this wasn't the case. I can revert it if you don't want this additional diff.

#define PySSLCertificate_CAST(op) ((PySSLCertificate *)(op))

static PyObject *
certificate_repr(PyObject *op)
{
PyObject *osubject, *result;
PySSLCertificate *self = _PySSLCertificate_CAST(op);
PySSLCertificate *self = PySSLCertificate_CAST(op);

/* subject string is ASCII encoded, UTF-8 chars are quoted */
osubject = _x509name_print(
Expand All @@ -181,7 +181,7 @@ certificate_repr(PyObject *op)
static Py_hash_t
certificate_hash(PyObject *op)
{
PySSLCertificate *self = _PySSLCertificate_CAST(op);
PySSLCertificate *self = PySSLCertificate_CAST(op);
if (self->hash == (Py_hash_t)-1) {
unsigned long hash;
hash = X509_subject_name_hash(self->cert);
Expand All @@ -198,7 +198,7 @@ static PyObject *
certificate_richcompare(PyObject *lhs, PyObject *rhs, int op)
{
int cmp;
PySSLCertificate *self = _PySSLCertificate_CAST(lhs);
PySSLCertificate *self = PySSLCertificate_CAST(lhs);
_sslmodulestate *state = get_state_cert(self);

if (Py_TYPE(rhs) != state->PySSLCertificate_Type) {
Expand All @@ -219,7 +219,7 @@ certificate_richcompare(PyObject *lhs, PyObject *rhs, int op)
static void
certificate_dealloc(PyObject *op)
{
PySSLCertificate *self = _PySSLCertificate_CAST(op);
PySSLCertificate *self = PySSLCertificate_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
X509_free(self->cert);
(void)Py_TYPE(self)->tp_free(self);
Expand Down
18 changes: 14 additions & 4 deletions Modules/_ssl/debughelpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,9 @@ _PySSL_msg_callback(int write_p, int version, int content_type,


static PyObject *
_PySSLContext_get_msg_callback(PySSLContext *self, void *c) {
_PySSLContext_get_msg_callback(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (self->msg_cb != NULL) {
return Py_NewRef(self->msg_cb);
} else {
Expand All @@ -94,7 +96,10 @@ _PySSLContext_get_msg_callback(PySSLContext *self, void *c) {
}

static int
_PySSLContext_set_msg_callback(PySSLContext *self, PyObject *arg, void *c) {
_PySSLContext_set_msg_callback(PyObject *op, PyObject *arg,
void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
Py_CLEAR(self->msg_cb);
if (arg == Py_None) {
SSL_CTX_set_msg_callback(self->ctx, NULL);
Expand Down Expand Up @@ -153,7 +158,9 @@ _PySSL_keylog_callback(const SSL *ssl, const char *line)
}

static PyObject *
_PySSLContext_get_keylog_filename(PySSLContext *self, void *c) {
_PySSLContext_get_keylog_filename(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (self->keylog_filename != NULL) {
return Py_NewRef(self->keylog_filename);
} else {
Expand All @@ -162,7 +169,10 @@ _PySSLContext_get_keylog_filename(PySSLContext *self, void *c) {
}

static int
_PySSLContext_set_keylog_filename(PySSLContext *self, PyObject *arg, void *c) {
_PySSLContext_set_keylog_filename(PyObject *op, PyObject *arg,
void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
FILE *fp;
/* Reset variables and callback first */
SSL_CTX_set_keylog_callback(self->ctx, NULL);
Expand Down
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