*/
/*
- * Copyright (C) 2012, 2013 Eric Biggers
+ * Copyright (C) 2012, 2013, 2014 Eric Biggers
*
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
*
- * wimlib is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 3 of the License, or (at your option)
- * any later version.
- *
- * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- * A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * This file is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
*/
#ifdef HAVE_CONFIG_H
#endif
#include "wimlib/assert.h"
+#include "wimlib/avl_tree.h"
#include "wimlib/endianness.h"
#include "wimlib/error.h"
#include "wimlib/security.h"
#include "wimlib/sha1.h"
#include "wimlib/util.h"
-/* At the start of each type of access control entry. */
-typedef struct _ACE_HEADER {
- /* enum ace_type, specifies what type of ACE this is. */
- u8 type;
-
- /* bitwise OR of the inherit ACE flags #defined above */
- u8 flags;
-
- /* Size of the access control entry. */
- le16 size;
-} _packed_attribute ACE_HEADER;
-
-/* Grants rights to a user or group */
-typedef struct _ACCESS_ALLOWED_ACE {
- ACE_HEADER hdr;
- le32 mask;
- le32 sid_start;
-} _packed_attribute ACCESS_ALLOWED_ACE;
-
-/* Denies rights to a user or group */
-typedef struct _ACCESS_DENIED_ACE {
- ACE_HEADER hdr;
- le32 mask;
- le32 sid_start;
-} _packed_attribute ACCESS_DENIED_ACE;
-
-typedef struct _SYSTEM_AUDIT_ACE {
- ACE_HEADER hdr;
- le32 mask;
- le32 sid_start;
-} _packed_attribute SYSTEM_AUDIT_ACE;
-
-
-/* Header of an access control list. */
-typedef struct _ACL {
- /* ACL_REVISION or ACL_REVISION_DS */
- u8 revision;
-
- /* padding */
- u8 sbz1;
-
- /* Total size of the ACL, including all access control entries */
- le16 acl_size;
-
- /* Number of access control entry structures that follow the ACL
- * structure. */
- le16 ace_count;
-
- /* padding */
- le16 sbz2;
-} _packed_attribute ACL;
-
-/* A structure used to identify users or groups. */
-typedef struct _SID {
-
- /* example: 0x1 */
- u8 revision;
- u8 sub_authority_count;
-
- /* Identifies the authority that issued the SID. Can be, but does not
- * have to be, one of enum sid_authority_value */
- u8 identifier_authority[6];
-
- le32 sub_authority[];
-} _packed_attribute SID;
-
-typedef struct _SECURITY_DESCRIPTOR_RELATIVE {
- /* Example: 0x1 */
- u8 revision;
- /* Example: 0x0 */
- u8 sbz1;
-
- /* Example: 0x4149 */
- le16 security_descriptor_control;
-
- /* Offset of a SID structure in the security descriptor. */
- /* Example: 0x14 */
- le32 owner_offset;
-
- /* Offset of a SID structure in the security descriptor. */
- /* Example: 0x24 */
- le32 group_offset;
-
- /* Offset of an ACL structure in the security descriptor. */
- /* System ACL. */
- /* Example: 0x00 */
- le32 sacl_offset;
-
- /* Offset of an ACL structure in the security descriptor. */
- /* Discretionary ACL. */
- /* Example: 0x34 */
- le32 dacl_offset;
-} _packed_attribute SECURITY_DESCRIPTOR_RELATIVE;
-
struct wim_security_data_disk {
le32 total_length;
le32 num_entries;
le64 sizes[];
} _packed_attribute;
-/*
- * This is a hack to work around a problem in libntfs-3g. libntfs-3g validates
- * security descriptors with a function named ntfs_valid_descr().
- * ntfs_valid_descr() considers a security descriptor that ends in a SACL
- * (Sysetm Access Control List) with no ACE's (Access Control Entries) to be
- * invalid. However, a security descriptor like this exists in the Windows 7
- * install.wim. Here, security descriptors matching this pattern are modified
- * to have no SACL. This should make no difference since the SACL had no
- * entries anyway; however this ensures that that the security descriptors pass
- * the validation in libntfs-3g.
- */
-static void
-empty_sacl_fixup(SECURITY_DESCRIPTOR_RELATIVE *descr, u64 *size_p)
-{
- /* No-op if no NTFS-3g support, or if NTFS-3g is version 2013 or later
- * */
-#if defined(WITH_NTFS_3G) && !defined(HAVE_NTFS_MNT_RDONLY)
- if (*size_p >= sizeof(SECURITY_DESCRIPTOR_RELATIVE)) {
- u32 sacl_offset = le32_to_cpu(descr->sacl_offset);
- if (sacl_offset == *size_p - sizeof(ACL)) {
- descr->sacl_offset = cpu_to_le32(0);
- *size_p -= sizeof(ACL);
- }
- }
-#endif
-}
-
struct wim_security_data *
new_wim_security_data(void)
{
/*
* Reads the security data from the metadata resource of a WIM image.
*
- * @metadata_resource: An array that contains the uncompressed metadata
- * resource for the WIM image.
- * @metadata_resource_len: The length of @metadata_resource. It must be at
- * least 8 bytes.
- * @sd_ret: A pointer to a pointer to a wim_security_data structure that
- * will be filled in with a pointer to a new wim_security_data
- * structure containing the security data on success.
+ * @buf
+ * Buffer containing an uncompressed WIM metadata resource.
+ * @buf_len
+ * Length of the uncompressed metadata resource, in bytes.
+ * @sd_ret
+ * On success, a pointer to the resulting security data structure will be
+ * returned here.
*
* Note: There is no `offset' argument because the security data is located at
* the beginning of the metadata resource.
*
- * Possible errors include:
- * WIMLIB_ERR_NOMEM
- * WIMLIB_ERR_INVALID_SECURITY_DATA
+ * Return values:
+ * WIMLIB_ERR_SUCCESS (0)
+ * WIMLIB_ERR_INVALID_METADATA_RESOURCE
+ * WIMLIB_ERR_NOMEM
*/
int
-read_wim_security_data(const u8 metadata_resource[], size_t metadata_resource_len,
+read_wim_security_data(const u8 *buf, size_t buf_len,
struct wim_security_data **sd_ret)
{
struct wim_security_data *sd;
const struct wim_security_data_disk *sd_disk;
const u8 *p;
- wimlib_assert(metadata_resource_len >= 8);
+ if (buf_len < 8)
+ return WIMLIB_ERR_INVALID_METADATA_RESOURCE;
sd = new_wim_security_data();
if (!sd)
goto out_of_memory;
- sd_disk = (const struct wim_security_data_disk*)metadata_resource;
- sd->total_length = le32_to_cpu(sd_disk->total_length);
+ sd_disk = (const struct wim_security_data_disk *)buf;
+ sd->total_length = ALIGN(le32_to_cpu(sd_disk->total_length), 8);
sd->num_entries = le32_to_cpu(sd_disk->num_entries);
- DEBUG("Reading security data: num_entries=%u, total_length=%u",
- sd->num_entries, sd->total_length);
-
/* Length field of 0 is a special case that really means length
* of 8. */
if (sd->total_length == 0)
* integer, even though each security descriptor size is a 64-bit
* integer. This is stupid, and we need to be careful not to actually
* let the security descriptor sizes be over 0xffffffff. */
- if (sd->total_length > metadata_resource_len)
+ if (sd->total_length > buf_len)
goto out_invalid_sd;
sizes_size = (u64)sd->num_entries * sizeof(u64);
/* Return immediately if no security descriptors. */
if (sd->num_entries == 0)
- goto out_align_total_length;
+ goto out_descriptors_ready;
/* Allocate a new buffer for the sizes array */
sd->sizes = MALLOC(sizes_size);
if (!sd->descriptors[i])
goto out_of_memory;
p += sd->sizes[i];
- empty_sacl_fixup((SECURITY_DESCRIPTOR_RELATIVE*)sd->descriptors[i],
- &sd->sizes[i]);
}
-out_align_total_length:
- total_len = (total_len + 7) & ~7;
- sd->total_length = (sd->total_length + 7) & ~7;
- if (total_len != sd->total_length) {
- WARNING("Expected WIM security data total length of "
- "%u bytes, but calculated %u bytes",
- sd->total_length, (unsigned)total_len);
+out_descriptors_ready:
+ if (ALIGN(total_len, 8) != sd->total_length) {
+ WARNING("Stored WIM security data total length was "
+ "%"PRIu32" bytes, but calculated %"PRIu32" bytes",
+ sd->total_length, (u32)total_len);
}
*sd_ret = sd;
ret = 0;
goto out;
out_invalid_sd:
ERROR("WIM security data is invalid!");
- ret = WIMLIB_ERR_INVALID_SECURITY_DATA;
+ ret = WIMLIB_ERR_INVALID_METADATA_RESOURCE;
goto out_free_sd;
out_of_memory:
ERROR("Out of memory while reading WIM security data!");
write_wim_security_data(const struct wim_security_data * restrict sd,
u8 * restrict p)
{
- DEBUG("Writing security data (total_length = %"PRIu32", num_entries "
- "= %"PRIu32")", sd->total_length, sd->num_entries);
-
u8 *orig_p = p;
struct wim_security_data_disk *sd_disk = (struct wim_security_data_disk*)p;
u32 num_entries = sd->num_entries;
*p++ = 0;
wimlib_assert(p - orig_p == sd->total_length);
-
- DEBUG("Successfully wrote security data.");
return p;
}
-static void
-print_acl(const ACL *acl, const tchar *type, size_t max_size)
-{
- const u8 *p;
-
- if (max_size < sizeof(ACL))
- return;
-
- u8 revision = acl->revision;
- u16 acl_size = le16_to_cpu(acl->acl_size);
- u16 ace_count = le16_to_cpu(acl->ace_count);
-
- tprintf(T(" [%"TS" ACL]\n"), type);
- tprintf(T(" Revision = %u\n"), revision);
- tprintf(T(" ACL Size = %u\n"), acl_size);
- tprintf(T(" ACE Count = %u\n"), ace_count);
-
- p = (const u8*)acl + sizeof(ACL);
- for (u16 i = 0; i < ace_count; i++) {
- if (max_size < p + sizeof(ACCESS_ALLOWED_ACE) - (const u8*)acl)
- break;
- const ACCESS_ALLOWED_ACE *aaa = (const ACCESS_ALLOWED_ACE*)p;
- tprintf(T(" [ACE]\n"));
- tprintf(T(" ACE type = %d\n"), aaa->hdr.type);
- tprintf(T(" ACE flags = 0x%x\n"), aaa->hdr.flags);
- tprintf(T(" ACE size = %u\n"), le16_to_cpu(aaa->hdr.size));
- tprintf(T(" ACE mask = %x\n"), le32_to_cpu(aaa->mask));
- tprintf(T(" SID start = %u\n"), le32_to_cpu(aaa->sid_start));
- p += le16_to_cpu(aaa->hdr.size);
- }
- tputchar(T('\n'));
-}
-
-static void
-print_sid(const SID *sid, const tchar *type, size_t max_size)
-{
- if (max_size < sizeof(SID))
- return;
-
- tprintf(T(" [%"TS" SID]\n"), type);
- tprintf(T(" Revision = %u\n"), sid->revision);
- tprintf(T(" Subauthority count = %u\n"), sid->sub_authority_count);
- tprintf(T(" Identifier authority = "));
- print_byte_field(sid->identifier_authority,
- sizeof(sid->identifier_authority), stdout);
- tputchar(T('\n'));
- if (max_size < sizeof(SID) + (size_t)sid->sub_authority_count * sizeof(u32))
- return;
- for (u8 i = 0; i < sid->sub_authority_count; i++) {
- tprintf(T(" Subauthority %u = %u\n"),
- i, le32_to_cpu(sid->sub_authority[i]));
- }
- tputchar(T('\n'));
-}
-
-static void
-print_security_descriptor(const SECURITY_DESCRIPTOR_RELATIVE *descr,
- size_t size)
-{
- u8 revision = descr->revision;
- u16 control = le16_to_cpu(descr->security_descriptor_control);
- u32 owner_offset = le32_to_cpu(descr->owner_offset);
- u32 group_offset = le32_to_cpu(descr->group_offset);
- u32 dacl_offset = le32_to_cpu(descr->dacl_offset);
- u32 sacl_offset = le32_to_cpu(descr->sacl_offset);
-
- tprintf(T("Revision = %u\n"), revision);
- tprintf(T("Security Descriptor Control = %#x\n"), control);
- tprintf(T("Owner offset = %u\n"), owner_offset);
- tprintf(T("Group offset = %u\n"), group_offset);
- tprintf(T("Discretionary ACL offset = %u\n"), dacl_offset);
- tprintf(T("System ACL offset = %u\n"), sacl_offset);
-
- if (owner_offset != 0 && owner_offset <= size)
- print_sid((const SID*)((const u8*)descr + owner_offset),
- T("Owner"), size - owner_offset);
-
- if (group_offset != 0 && group_offset <= size)
- print_sid((const SID*)((const u8*)descr + group_offset),
- T("Group"), size - group_offset);
-
- if (dacl_offset != 0 && dacl_offset <= size)
- print_acl((const ACL*)((const u8*)descr + dacl_offset),
- T("Discretionary"), size - dacl_offset);
-
- if (sacl_offset != 0 && sacl_offset <= size)
- print_acl((const ACL*)((const u8*)descr + sacl_offset),
- T("System"), size - sacl_offset);
-}
-
-/*
- * Prints the security data for a WIM file.
- */
-void
-print_wim_security_data(const struct wim_security_data *sd)
-{
- tputs(T("[SECURITY DATA]"));
- tprintf(T("Length = %"PRIu32" bytes\n"), sd->total_length);
- tprintf(T("Number of Entries = %"PRIu32"\n"), sd->num_entries);
-
- for (u32 i = 0; i < sd->num_entries; i++) {
- tprintf(T("[SECURITY_DESCRIPTOR_RELATIVE %"PRIu32", length = %"PRIu64"]\n"),
- i, sd->sizes[i]);
- print_security_descriptor((const SECURITY_DESCRIPTOR_RELATIVE*)sd->descriptors[i],
- sd->sizes[i]);
- tputchar(T('\n'));
- }
- tputchar(T('\n'));
-}
-
void
free_wim_security_data(struct wim_security_data *sd)
{
}
struct sd_node {
- int security_id;
+ s32 security_id;
u8 hash[SHA1_HASH_SIZE];
- struct rb_node rb_node;
+ struct avl_tree_node index_node;
};
+#define SD_NODE(avl_node) \
+ avl_tree_entry(avl_node, struct sd_node, index_node)
+
static void
-free_sd_tree(struct rb_node *node)
+free_sd_tree(struct avl_tree_node *node)
{
if (node) {
- free_sd_tree(node->rb_left);
- free_sd_tree(node->rb_right);
- FREE(container_of(node, struct sd_node, rb_node));
+ free_sd_tree(node->left);
+ free_sd_tree(node->right);
+ FREE(SD_NODE(node));
}
}
+void
+rollback_new_security_descriptors(struct wim_sd_set *sd_set)
+{
+ struct wim_security_data *sd = sd_set->sd;
+ u8 **descriptors = sd->descriptors + sd_set->orig_num_entries;
+ u32 num_entries = sd->num_entries - sd_set->orig_num_entries;
+ while (num_entries--)
+ FREE(*descriptors++);
+ sd->num_entries = sd_set->orig_num_entries;
+}
+
/* Frees a security descriptor index set. */
void
-destroy_sd_set(struct wim_sd_set *sd_set, bool rollback)
+destroy_sd_set(struct wim_sd_set *sd_set)
{
- if (rollback) {
- struct wim_security_data *sd = sd_set->sd;
- u8 **descriptors = sd->descriptors + sd_set->orig_num_entries;
- u32 num_entries = sd->num_entries - sd_set->orig_num_entries;
- while (num_entries--)
- FREE(*descriptors++);
- sd->num_entries = sd_set->orig_num_entries;
- }
- free_sd_tree(sd_set->rb_root.rb_node);
+ free_sd_tree(sd_set->root);
+}
+
+static int
+_avl_cmp_nodes_by_hash(const struct avl_tree_node *n1,
+ const struct avl_tree_node *n2)
+{
+ return hashes_cmp(SD_NODE(n1)->hash, SD_NODE(n2)->hash);
}
-/* Inserts a a new node into the security descriptor index tree. */
+/* Inserts a new node into the security descriptor index tree. Returns true
+ * if successful (not a duplicate). */
static bool
insert_sd_node(struct wim_sd_set *set, struct sd_node *new)
{
- struct rb_root *root = &set->rb_root;
- struct rb_node **p = &(root->rb_node);
- struct rb_node *rb_parent = NULL;
-
- while (*p) {
- struct sd_node *this = container_of(*p, struct sd_node, rb_node);
- int cmp = hashes_cmp(new->hash, this->hash);
-
- rb_parent = *p;
- if (cmp < 0)
- p = &((*p)->rb_left);
- else if (cmp > 0)
- p = &((*p)->rb_right);
- else
- return false; /* Duplicate security descriptor */
- }
- rb_link_node(&new->rb_node, rb_parent, p);
- rb_insert_color(&new->rb_node, root);
- return true;
+ return NULL == avl_tree_insert(&set->root, &new->index_node,
+ _avl_cmp_nodes_by_hash);
}
/* Returns the index of the security descriptor having a SHA1 message digest of
* @hash. If not found, return -1. */
-int
+static s32
lookup_sd(struct wim_sd_set *set, const u8 hash[SHA1_HASH_SIZE])
{
- struct rb_node *node = set->rb_root.rb_node;
-
- while (node) {
- struct sd_node *sd_node = container_of(node, struct sd_node, rb_node);
- int cmp = hashes_cmp(hash, sd_node->hash);
- if (cmp < 0)
- node = node->rb_left;
- else if (cmp > 0)
- node = node->rb_right;
- else
- return sd_node->security_id;
- }
- return -1;
+ struct avl_tree_node *res;
+ struct sd_node dummy;
+
+ copy_hash(dummy.hash, hash);
+ res = avl_tree_lookup_node(set->root, &dummy.index_node,
+ _avl_cmp_nodes_by_hash);
+ if (!res)
+ return -1;
+ return SD_NODE(res)->security_id;
}
/*
* the security ID for it. If a new security descriptor cannot be allocated,
* return -1.
*/
-int
+s32
sd_set_add_sd(struct wim_sd_set *sd_set, const char *descriptor, size_t size)
{
u8 hash[SHA1_HASH_SIZE];
- int security_id;
+ s32 security_id;
struct sd_node *new;
u8 **descriptors;
u64 *sizes;
sd->descriptors[sd->num_entries] = descr_copy;
sd->sizes[sd->num_entries] = size;
sd->num_entries++;
- DEBUG("There are now %u security descriptors", sd->num_entries);
bret = insert_sd_node(sd_set, new);
wimlib_assert(bret);
security_id = new->security_id;
int ret;
sd_set->sd = sd;
- sd_set->rb_root.rb_node = NULL;
+ sd_set->root = NULL;
/* Remember the original number of security descriptors so that newly
* added ones can be rolled back if needed. */
ret = 0;
goto out;
out_destroy_sd_set:
- destroy_sd_set(sd_set, false);
+ destroy_sd_set(sd_set);
out:
return ret;
}
git://wimlib.net / wimlib / blobdiff