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openssl/crypto/passphrase.c
Richard Levitte 67b6401356 CORE: Fix small bug in passphrase caching 
Passphrase caching didn't allocate memory when it got to cache an
empty string, leading to a crash.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12587)
2020-09-03 17:48:32 +02:00

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/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/err.h>
#include <openssl/ui.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/passphrase.h"
void ossl_pw_clear_passphrase_data(struct ossl_passphrase_data_st *data)
{
if (data != NULL) {
if (data->type == is_expl_passphrase)
OPENSSL_clear_free(data->_.expl_passphrase.passphrase_copy,
data->_.expl_passphrase.passphrase_len);
ossl_pw_clear_passphrase_cache(data);
memset(data, 0, sizeof(*data));
}
}
void ossl_pw_clear_passphrase_cache(struct ossl_passphrase_data_st *data)
{
OPENSSL_clear_free(data->cached_passphrase, data->cached_passphrase_len);
data->cached_passphrase = NULL;
}
int ossl_pw_set_passphrase(struct ossl_passphrase_data_st *data,
const unsigned char *passphrase,
size_t passphrase_len)
{
if (!ossl_assert(data != NULL && passphrase != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ossl_pw_clear_passphrase_data(data);
data->type = is_expl_passphrase;
data->_.expl_passphrase.passphrase_copy =
OPENSSL_memdup(passphrase, passphrase_len);
if (data->_.expl_passphrase.passphrase_copy == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
return 0;
}
data->_.expl_passphrase.passphrase_len = passphrase_len;
return 1;
}
int ossl_pw_set_pem_password_cb(struct ossl_passphrase_data_st *data,
pem_password_cb *cb, void *cbarg)
{
if (!ossl_assert(data != NULL && cb != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ossl_pw_clear_passphrase_data(data);
data->type = is_pem_password;
data->_.pem_password.password_cb = cb;
data->_.pem_password.password_cbarg = cbarg;
return 1;
}
int ossl_pw_set_ossl_passphrase_cb(struct ossl_passphrase_data_st *data,
OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg)
{
if (!ossl_assert(data != NULL && cb != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ossl_pw_clear_passphrase_data(data);
data->type = is_ossl_passphrase;
data->_.ossl_passphrase.passphrase_cb = cb;
data->_.ossl_passphrase.passphrase_cbarg = cbarg;
return 1;
}
int ossl_pw_set_ui_method(struct ossl_passphrase_data_st *data,
const UI_METHOD *ui_method, void *ui_data)
{
if (!ossl_assert(data != NULL && ui_method != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
ossl_pw_clear_passphrase_data(data);
data->type = is_ui_method;
data->_.ui_method.ui_method = ui_method;
data->_.ui_method.ui_method_data = ui_data;
return 1;
}
int ossl_pw_enable_passphrase_caching(struct ossl_passphrase_data_st *data)
{
data->flag_cache_passphrase = 1;
return 1;
}
int ossl_pw_disable_passphrase_caching(struct ossl_passphrase_data_st *data)
{
data->flag_cache_passphrase = 0;
return 1;
}
/*-
* UI_METHOD processor. It differs from UI_UTIL_read_pw() like this:
*
* 1. It constructs a prompt on its own, based on |prompt_info|.
* 2. It allocates a buffer for verification on its own.
* 3. It raises errors.
* 4. It reports back the length of the prompted pass phrase.
*/
static int do_ui_passphrase(char *pass, size_t pass_size, size_t *pass_len,
const char *prompt_info, int verify,
const UI_METHOD *ui_method, void *ui_data)
{
char *prompt = NULL, *vpass = NULL;
int prompt_idx = -1, verify_idx = -1;
UI *ui = NULL;
int ret = 0;
if (!ossl_assert(pass != NULL && pass_size != 0 && pass_len != NULL)) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if ((ui = UI_new()) == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
return 0;
}
if (ui_method != NULL) {
UI_set_method(ui, ui_method);
if (ui_data != NULL)
UI_add_user_data(ui, ui_data);
}
/* Get an application constructed prompt */
prompt = UI_construct_prompt(ui, "pass phrase", prompt_info);
if (prompt == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
goto end;
}
prompt_idx = UI_add_input_string(ui, prompt,
UI_INPUT_FLAG_DEFAULT_PWD,
pass, 0, pass_size - 1) - 1;
if (prompt_idx < 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_UI_LIB);
goto end;
}
if (verify) {
/* Get a buffer for verification prompt */
vpass = OPENSSL_zalloc(pass_size);
if (vpass == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
goto end;
}
verify_idx = UI_add_verify_string(ui, prompt,
UI_INPUT_FLAG_DEFAULT_PWD,
vpass, 0, pass_size - 1,
pass) - 1;
if (verify_idx < 0) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_UI_LIB);
goto end;
}
}
switch (UI_process(ui)) {
case -2:
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERRUPTED_OR_CANCELLED);
break;
case -1:
ERR_raise(ERR_LIB_CRYPTO, ERR_R_UI_LIB);
break;
default:
*pass_len = (size_t)UI_get_result_length(ui, prompt_idx);
ret = 1;
break;
}
end:
OPENSSL_free(vpass);
OPENSSL_free(prompt);
UI_free(ui);
return ret;
}
/* Central pw prompting dispatcher */
int ossl_pw_get_passphrase(char *pass, size_t pass_size, size_t *pass_len,
const OSSL_PARAM params[], int verify,
struct ossl_passphrase_data_st *data)
{
const char *source = NULL;
size_t source_len = 0;
const char *prompt_info = NULL;
const UI_METHOD *ui_method = NULL;
UI_METHOD *allocated_ui_method = NULL;
void *ui_data = NULL;
const OSSL_PARAM *p = NULL;
int ret;
/* Handle explicit and cached passphrases */
if (data->type == is_expl_passphrase) {
source = data->_.expl_passphrase.passphrase_copy;
source_len = data->_.expl_passphrase.passphrase_len;
} else if (data->flag_cache_passphrase && data->cached_passphrase != NULL) {
source = data->cached_passphrase;
source_len = data->cached_passphrase_len;
}
if (source != NULL) {
if (source_len > pass_size)
source_len = pass_size;
memcpy(pass, source, source_len);
*pass_len = source_len;
return 1;
}
/* Handle the is_ossl_passphrase case... that's pretty direct */
if (data->type == is_ossl_passphrase) {
OSSL_PASSPHRASE_CALLBACK *cb = data->_.ossl_passphrase.passphrase_cb;
void *cbarg = data->_.ossl_passphrase.passphrase_cbarg;
ret = cb(pass, pass_size, pass_len, params, cbarg);
goto do_cache;
}
/* Handle the is_pem_password and is_ui_method cases */
if ((p = OSSL_PARAM_locate_const(params,
OSSL_PASSPHRASE_PARAM_INFO)) != NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING) {
ERR_raise_data(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT,
"Prompt info data type incorrect");
return 0;
}
prompt_info = p->data;
}
if (data->type == is_pem_password) {
/* We use a UI wrapper for PEM */
pem_password_cb *cb = data->_.pem_password.password_cb;
ui_method = allocated_ui_method =
UI_UTIL_wrap_read_pem_callback(cb, verify);
ui_data = data->_.pem_password.password_cbarg;
if (ui_method == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
return 0;
}
} else if (data->type == is_ui_method) {
ui_method = data->_.ui_method.ui_method;
ui_data = data->_.ui_method.ui_method_data;
}
if (ui_method == NULL) {
ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
return 0;
}
ret = do_ui_passphrase(pass, pass_size, pass_len, prompt_info, verify,
ui_method, ui_data);
UI_destroy_method(allocated_ui_method);
do_cache:
if (ret && data->flag_cache_passphrase) {
if (data->cached_passphrase == NULL
|| *pass_len > data->cached_passphrase_len) {
void *new_cache =
OPENSSL_clear_realloc(data->cached_passphrase,
data->cached_passphrase_len,
*pass_len + 1);
if (new_cache == NULL) {
OPENSSL_cleanse(pass, *pass_len);
ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
return 0;
}
data->cached_passphrase = new_cache;
}
memcpy(data->cached_passphrase, pass, *pass_len);
data->cached_passphrase[*pass_len] = '\0';
data->cached_passphrase_len = *pass_len;
}
return ret;
}
int ossl_pw_pem_password(char *buf, int size, int rwflag, void *userdata)
{
size_t password_len = 0;
OSSL_PARAM params[] = {
OSSL_PARAM_utf8_string(OSSL_PASSPHRASE_PARAM_INFO, NULL, 0),
OSSL_PARAM_END
};
params[0].data = "PEM";
if (ossl_pw_get_passphrase(buf, (size_t)size, &password_len, params,
rwflag, userdata))
return (int)password_len;
return -1;
}
int ossl_pw_passphrase_callback_enc(char *pass, size_t pass_size,
size_t *pass_len,
const OSSL_PARAM params[], void *arg)
{
return ossl_pw_get_passphrase(pass, pass_size, pass_len, params, 1, arg);
}
int ossl_pw_passphrase_callback_dec(char *pass, size_t pass_size,
size_t *pass_len,
const OSSL_PARAM params[], void *arg)
{
return ossl_pw_get_passphrase(pass, pass_size, pass_len, params, 0, arg);
}
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