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mlock() the returned private key to prevent it from being saved to swap

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Kovid Goyal 2022-08-04 11:08:54 +05:30
parent adf47bed89
commit 183a31c884
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GPG key ID: 06BC317B515ACE7C
1 changed files with 6 additions and 4 deletions
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10
kitty/crypto.c
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@ -12,6 +12,7 @@
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/bio.h>
#include <sys/mman.h>
typedef struct {
PyObject_HEAD
@ -72,10 +73,10 @@ static PyObject*
elliptic_curve_key_get_public(EllipticCurveKey *self, void UNUSED *closure) {
/* PEM_write_PUBKEY(stdout, pkey); */
size_t len = 0;
if (1 != EVP_PKEY_get_raw_public_key(self->key, NULL, &len)) return set_error_from_openssl("Could not get public key from EVP_KEY");
if (1 != EVP_PKEY_get_raw_public_key(self->key, NULL, &len)) return set_error_from_openssl("Could not get public key from EVP_PKEY");
PyObject *ans = PyBytes_FromStringAndSize(NULL, len);
if (!ans) return NULL;
if (1 != EVP_PKEY_get_raw_public_key(self->key, (unsigned char*)PyBytes_AS_STRING(ans), &len)) return set_error_from_openssl("Could not get public key from EVP_KEY");
if (1 != EVP_PKEY_get_raw_public_key(self->key, (unsigned char*)PyBytes_AS_STRING(ans), &len)) { Py_CLEAR(ans); return set_error_from_openssl("Could not get public key from EVP_PKEY"); }
return ans;
}
@ -84,10 +85,11 @@ elliptic_curve_key_get_public(EllipticCurveKey *self, void UNUSED *closure) {
static PyObject*
elliptic_curve_key_get_private(EllipticCurveKey *self, void UNUSED *closure) {
size_t len = 0;
if (1 != EVP_PKEY_get_raw_private_key(self->key, NULL, &len)) return set_error_from_openssl("Could not get public key from EVP_KEY");
if (1 != EVP_PKEY_get_raw_private_key(self->key, NULL, &len)) return set_error_from_openssl("Could not get public key from EVP_PKEY");
PyObject *ans = PyBytes_FromStringAndSize(NULL, len);
if (!ans) return NULL;
if (1 != EVP_PKEY_get_raw_private_key(self->key, (unsigned char*)PyBytes_AS_STRING(ans), &len)) return set_error_from_openssl("Could not get public key from EVP_KEY");
mlock(PyBytes_AS_STRING(ans), len);
if (1 != EVP_PKEY_get_raw_private_key(self->key, (unsigned char*)PyBytes_AS_STRING(ans), &len)) { Py_CLEAR(ans); return set_error_from_openssl("Could not get public key from EVP_PKEY"); }
return ans;
}