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Bring over a new version of the secure memory code from gcr

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* This allows libraries to share the pool if they have the same
   version of the secure memory code.
This commit is contained in:
Stef Walter 2012-10-27 11:58:13 +02:00
parent 275d314d57
commit 7cea18071b
6 changed files with 301 additions and 290 deletions
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105
egg/egg-secure-memory.c
View File

@ -1,25 +1,25 @@
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* egg-secure-memory.h - library for allocating memory that is non-pageable /* egg-secure-memory.h - library for allocating memory that is non-pageable
*
* Copyright (C) 2007 Stefan Walter Copyright (C) 2007 Stefan Walter
*
* This program is free software; you can redistribute it and/or modify The Gnome Keyring Library is free software; you can redistribute it and/or
* it under the terms of the GNU Lesser General Public License as modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2.1 of published by the Free Software Foundation; either version 2 of the
* the License, or (at your option) any later version. License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but The Gnome Keyring Library is distributed in the hope that it will be useful,
* WITHOUT ANY WARRANTY; without even the implied warranty of but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details. Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software License along with the Gnome Library; see the file COPYING.LIB. If not,
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* MA 02110-1301 USA Boston, MA 02111-1307, USA.
*
* Author: Stef Walter <stef@thewalter.net> Author: Stef Walter <stef@memberwebs.com>
*/ */
/* /*
* IMPORTANT: This is pure vanila standard C, no glib. We need this * IMPORTANT: This is pure vanila standard C, no glib. We need this
@ -66,12 +66,12 @@
#endif #endif
#define DO_LOCK() \ #define DO_LOCK() \
egg_memory_lock (); EGG_SECURE_GLOBALS.lock ();
#define DO_UNLOCK() \ #define DO_UNLOCK() \
egg_memory_unlock (); EGG_SECURE_GLOBALS.unlock ();
static int lock_warning = 1; static int show_warning = 1;
int egg_secure_warnings = 1; int egg_secure_warnings = 1;
/* /*
@ -163,17 +163,25 @@ typedef struct _Pool {
Item items[1]; /* Actual items hang off here */ Item items[1]; /* Actual items hang off here */
} Pool; } Pool;
static Pool *all_pools = NULL; static void *
static void*
pool_alloc (void) pool_alloc (void)
{ {
Pool *pool; Pool *pool;
void *pages, *item; void *pages, *item;
size_t len, i; size_t len, i;
if (!EGG_SECURE_GLOBALS.pool_version ||
strcmp (EGG_SECURE_GLOBALS.pool_version, EGG_SECURE_POOL_VER_STR) != 0) {
if (show_warning && egg_secure_warnings)
fprintf (stderr, "the secure memory pool version does not match the code '%s' != '%s'\n",
EGG_SECURE_GLOBALS.pool_version ? EGG_SECURE_GLOBALS.pool_version : "(null)",
EGG_SECURE_POOL_VER_STR);
show_warning = 0;
return NULL;
}
/* A pool with an available item */ /* A pool with an available item */
for (pool = all_pools; pool; pool = pool->next) { for (pool = EGG_SECURE_GLOBALS.pool_data; pool; pool = pool->next) {
if (unused_peek (&pool->unused)) if (unused_peek (&pool->unused))
break; break;
} }
@ -187,8 +195,8 @@ pool_alloc (void)
/* Fill in the block header, and inlude in block list */ /* Fill in the block header, and inlude in block list */
pool = pages; pool = pages;
pool->next = all_pools; pool->next = EGG_SECURE_GLOBALS.pool_data;
all_pools = pool; EGG_SECURE_GLOBALS.pool_data = pool;
pool->length = len; pool->length = len;
pool->used = 0; pool->used = 0;
pool->unused = NULL; pool->unused = NULL;
@ -223,7 +231,8 @@ pool_free (void* item)
ptr = item; ptr = item;
/* Find which block this one belongs to */ /* Find which block this one belongs to */
for (at = &all_pools, pool = *at; pool; at = &pool->next, pool = *at) { for (at = (Pool **)&EGG_SECURE_GLOBALS.pool_data, pool = *at;
pool != NULL; at = &pool->next, pool = *at) {
beg = (char*)pool->items; beg = (char*)pool->items;
end = (char*)pool + pool->length - sizeof (Item); end = (char*)pool + pool->length - sizeof (Item);
if (ptr >= beg && ptr <= end) { if (ptr >= beg && ptr <= end) {
@ -270,7 +279,7 @@ pool_valid (void* item)
ptr = item; ptr = item;
/* Find which block this one belongs to */ /* Find which block this one belongs to */
for (pool = all_pools; pool; pool = pool->next) { for (pool = EGG_SECURE_GLOBALS.pool_data; pool; pool = pool->next) {
beg = (char*)pool->items; beg = (char*)pool->items;
end = (char*)pool + pool->length - sizeof (Item); end = (char*)pool + pool->length - sizeof (Item);
if (ptr >= beg && ptr <= end) if (ptr >= beg && ptr <= end)
@ -858,18 +867,18 @@ sec_acquire_pages (size_t *sz,
#if defined(HAVE_MLOCK) #if defined(HAVE_MLOCK)
pages = mmap (0, *sz, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0); pages = mmap (0, *sz, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (pages == MAP_FAILED) { if (pages == MAP_FAILED) {
if (lock_warning && egg_secure_warnings) if (show_warning && egg_secure_warnings)
fprintf (stderr, "couldn't map %lu bytes of memory (%s): %s\n", fprintf (stderr, "couldn't map %lu bytes of memory (%s): %s\n",
(unsigned long)*sz, during_tag, strerror (errno)); (unsigned long)*sz, during_tag, strerror (errno));
lock_warning = 0; show_warning = 0;
return NULL; return NULL;
} }
if (mlock (pages, *sz) < 0) { if (mlock (pages, *sz) < 0) {
if (lock_warning && egg_secure_warnings && errno != EPERM) { if (show_warning && egg_secure_warnings && errno != EPERM) {
fprintf (stderr, "couldn't lock %lu bytes of memory (%s): %s\n", fprintf (stderr, "couldn't lock %lu bytes of memory (%s): %s\n",
(unsigned long)*sz, during_tag, strerror (errno)); (unsigned long)*sz, during_tag, strerror (errno));
lock_warning = 0; show_warning = 0;
} }
munmap (pages, *sz); munmap (pages, *sz);
return NULL; return NULL;
@ -877,13 +886,13 @@ sec_acquire_pages (size_t *sz,
DEBUG_ALLOC ("gkr-secure-memory: new block ", *sz); DEBUG_ALLOC ("gkr-secure-memory: new block ", *sz);
lock_warning = 1; show_warning = 1;
return pages; return pages;
#else #else
if (lock_warning && egg_secure_warnings) if (show_warning && egg_secure_warnings)
fprintf (stderr, "your system does not support private memory"); fprintf (stderr, "your system does not support private memory");
lock_warning = 0; show_warning = 0;
return NULL; return NULL;
#endif #endif
@ -1050,8 +1059,8 @@ egg_secure_alloc_full (const char *tag,
DO_UNLOCK (); DO_UNLOCK ();
if (!memory && (flags & EGG_SECURE_USE_FALLBACK)) { if (!memory && (flags & EGG_SECURE_USE_FALLBACK) && EGG_SECURE_GLOBALS.fallback != NULL) {
memory = egg_memory_fallback (NULL, length); memory = EGG_SECURE_GLOBALS.fallback (NULL, length);
if (memory) /* Our returned memory is always zeroed */ if (memory) /* Our returned memory is always zeroed */
memset (memory, 0, length); memset (memory, 0, length);
} }
@ -1124,17 +1133,17 @@ egg_secure_realloc_full (const char *tag,
DO_UNLOCK (); DO_UNLOCK ();
if (!block) { if (!block) {
if ((flags & EGG_SECURE_USE_FALLBACK)) { if ((flags & EGG_SECURE_USE_FALLBACK) && EGG_SECURE_GLOBALS.fallback) {
/* /*
* In this case we can't zero the returned memory, * In this case we can't zero the returned memory,
* because we don't know what the block size was. * because we don't know what the block size was.
*/ */
return egg_memory_fallback (memory, length); return EGG_SECURE_GLOBALS.fallback (memory, length);
} else { } else {
if (egg_secure_warnings) if (egg_secure_warnings)
fprintf (stderr, "memory does not belong to gnome-keyring: 0x%08lx\n", fprintf (stderr, "memory does not belong to secure memory pool: 0x%08lx\n",
(unsigned long)memory); (unsigned long)memory);
ASSERT (0 && "memory does does not belong to gnome-keyring"); ASSERT (0 && "memory does does not belong to secure memory pool");
return NULL; return NULL;
} }
} }
@ -1190,13 +1199,13 @@ egg_secure_free_full (void *memory, int flags)
DO_UNLOCK (); DO_UNLOCK ();
if (!block) { if (!block) {
if ((flags & EGG_SECURE_USE_FALLBACK)) { if ((flags & EGG_SECURE_USE_FALLBACK) && EGG_SECURE_GLOBALS.fallback) {
egg_memory_fallback (memory, 0); EGG_SECURE_GLOBALS.fallback (memory, 0);
} else { } else {
if (egg_secure_warnings) if (egg_secure_warnings)
fprintf (stderr, "memory does not belong to gnome-keyring: 0x%08lx\n", fprintf (stderr, "memory does not belong to secure memory pool: 0x%08lx\n",
(unsigned long)memory); (unsigned long)memory);
ASSERT (0 && "memory does does not belong to gnome-keyring"); ASSERT (0 && "memory does does not belong to secure memory pool");
} }
} }
} }

76
egg/egg-secure-memory.h
View File

@ -1,25 +1,25 @@
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* egg-secure-memory.h - library for allocating memory that is non-pageable /* egg-secure-memory.h - library for allocating memory that is non-pageable
*
* Copyright (C) 2007 Stefan Walter Copyright (C) 2007 Stefan Walter
*
* This program is free software; you can redistribute it and/or modify The Gnome Keyring Library is free software; you can redistribute it and/or
* it under the terms of the GNU Lesser General Public License as modify it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2.1 of published by the Free Software Foundation; either version 2 of the
* the License, or (at your option) any later version. License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but The Gnome Keyring Library is distributed in the hope that it will be useful,
* WITHOUT ANY WARRANTY; without even the implied warranty of but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details. Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software License along with the Gnome Library; see the file COPYING.LIB. If not,
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* MA 02110-1301 USA Boston, MA 02111-1307, USA.
*
* Author: Stef Walter <stef@thewalter.net> Author: Stef Walter <stef@memberwebs.com>
*/ */
#ifndef EGG_SECURE_MEMORY_H #ifndef EGG_SECURE_MEMORY_H
#define EGG_SECURE_MEMORY_H #define EGG_SECURE_MEMORY_H
@ -40,29 +40,31 @@
* secure memory between threads: * secure memory between threads:
*/ */
extern void egg_memory_lock (void); typedef struct {
void (* lock) (void);
void (* unlock) (void);
void * (* fallback) (void *pointer,
size_t length);
void * pool_data;
const char * pool_version;
} egg_secure_glob;
extern void egg_memory_unlock (void); #define EGG_SECURE_POOL_VER_STR "1.0"
#define EGG_SECURE_GLOBALS SECMEM_pool_data_v1_0
/* #define EGG_SECURE_DEFINE_GLOBALS(lock, unlock, fallback) \
* Allocation Fallbacks egg_secure_glob EGG_SECURE_GLOBALS = { \
* lock, unlock, fallback, NULL, EGG_SECURE_POOL_VER_STR };
* If we cannot allocate secure memory, then this function
* (defined elsewhere) will be called which has a chance to
* allocate other memory abort or do whatever.
*
* Same call semantics as realloc with regard to NULL and zeros
*/
extern void* egg_memory_fallback (void *p, size_t length);
#define EGG_SECURE_GLIB_DEFINITIONS() \ #define EGG_SECURE_DEFINE_GLIB_GLOBALS() \
static GStaticMutex memory_mutex = G_STATIC_MUTEX_INIT; \ static GStaticMutex memory_mutex = G_STATIC_MUTEX_INIT; \
void egg_memory_lock (void) \ static void egg_memory_lock (void) \
{ g_static_mutex_lock (&memory_mutex); } \ { g_static_mutex_lock (&memory_mutex); } \
void egg_memory_unlock (void) \ static void egg_memory_unlock (void) \
{ g_static_mutex_unlock (&memory_mutex); } \ { g_static_mutex_unlock (&memory_mutex); } \
void* egg_memory_fallback (void *p, size_t sz) \ EGG_SECURE_DEFINE_GLOBALS (egg_memory_lock, egg_memory_unlock, g_realloc);
{ return g_realloc (p, sz); } \
extern egg_secure_glob EGG_SECURE_GLOBALS;
/* /*
* Main functionality * Main functionality

2
egg/tests/test-dh.c
View File

@ -34,7 +34,7 @@
#include <glib.h> #include <glib.h>
#include <gcrypt.h> #include <gcrypt.h>
EGG_SECURE_GLIB_DEFINITIONS (); EGG_SECURE_DEFINE_GLIB_GLOBALS ();
static void static void
test_perform (void) test_perform (void)

2
egg/tests/test-hkdf.c
View File

@ -33,7 +33,7 @@
#include <gcrypt.h> #include <gcrypt.h>
EGG_SECURE_GLIB_DEFINITIONS (); EGG_SECURE_DEFINE_GLIB_GLOBALS ();
static void static void
test_hkdf_test_case_1 (void) test_hkdf_test_case_1 (void)

16
egg/tests/test-secmem.c
View File

@ -32,7 +32,7 @@
#include <string.h> #include <string.h>
EGG_SECURE_GLIB_DEFINITIONS (); EGG_SECURE_DEFINE_GLIB_GLOBALS ();
/* Declared in egg-secure-memory.c */ /* Declared in egg-secure-memory.c */
extern int egg_secure_warnings; extern int egg_secure_warnings;
@ -182,26 +182,25 @@ test_multialloc (void)
case 0: /* Allocate some memory */ case 0: /* Allocate some memory */
size = g_random_int_range (1, 16384); size = g_random_int_range (1, 16384);
data = egg_secure_alloc (size); data = egg_secure_alloc (size);
g_assert (data); g_assert (data != NULL);
memset (data, 0xCAFEBABE, size); memset (data, 0xCAFEBABE, size);
g_ptr_array_add (memory, data); g_ptr_array_add (memory, data);
break; break;
case 1: /* Reallocate some memory */ case 1: /* Reallocate some memory */
index = g_random_int_range (0, memory->len); index = g_random_int_range (0, memory->len);
data = g_ptr_array_index (memory, index); data = g_ptr_array_index (memory, index);
g_assert (data); g_assert (data != NULL);
size = g_random_int_range (1, 16384); size = g_random_int_range (1, 16384);
data = egg_secure_realloc (data, size); data = egg_secure_realloc (data, size);
g_assert (data); g_assert (data != NULL);
memset (data, 0xCAFEBABE, size); memset (data, 0xCAFEBABE, size);
g_ptr_array_index (memory, index) = data; g_ptr_array_index (memory, index) = data;
break; break;
case 2: /* Free some memory */ case 2: /* Free some memory */
index = g_random_int_range (0, memory->len); index = g_random_int_range (0, memory->len);
data = g_ptr_array_index (memory, index); data = g_ptr_array_remove_index_fast (memory, index);
g_assert (data); g_assert (data != NULL);
egg_secure_free (data); egg_secure_free (data);
g_ptr_array_remove_index_fast (memory, index);
break; break;
default: default:
g_assert_not_reached (); g_assert_not_reached ();
@ -214,7 +213,8 @@ test_multialloc (void)
} }
g_assert (memory->len == 0); g_assert (memory->len == 0);
g_ptr_array_set_free_func (memory, egg_secure_free); for (i = 0; i < memory->len; i++)
egg_secure_free (memory->pdata[i]);
g_ptr_array_free (memory, TRUE); g_ptr_array_free (memory, TRUE);
egg_secure_warnings = 1; egg_secure_warnings = 1;

2
libsecret/secret-service.c
View File

@ -104,7 +104,7 @@
* during a secret_service_get() or secret_service_new() operation. * during a secret_service_get() or secret_service_new() operation.
*/ */
EGG_SECURE_GLIB_DEFINITIONS (); EGG_SECURE_DEFINE_GLIB_GLOBALS ();
GQuark _secret_error_quark = 0; GQuark _secret_error_quark = 0;