#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.
+ * resource for the WIM image.
+ * @metadata_resource_len: The length of @metadata_resource.
* @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.
+ * will be filled in with a pointer to a new wim_security_data
+ * structure containing the security data on success.
*
* Note: There is no `offset' argument because the security data is located at
* the beginning of the metadata resource.
*
* Return values:
* WIMLIB_ERR_SUCCESS (0)
- * WIMLIB_ERR_INVALID_METADATA_RESOURCE
- * WIMLIB_ERR_NOMEM
+ * WIMLIB_ERR_INVALID_METADATA_RESOURCE
+ * WIMLIB_ERR_NOMEM
*/
int
read_wim_security_data(const u8 metadata_resource[], size_t metadata_resource_len,
const struct wim_security_data_disk *sd_disk;
const u8 *p;
- wimlib_assert(metadata_resource_len >= 8);
+ if (metadata_resource_len < 8)
+ return WIMLIB_ERR_INVALID_METADATA_RESOURCE;
sd = new_wim_security_data();
if (!sd)
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;
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)
{
/* Returns the index of the security descriptor having a SHA1 message digest of
* @hash. If not found, return -1. */
-int
+static int
lookup_sd(struct wim_sd_set *set, const u8 hash[SHA1_HASH_SIZE])
{
struct rb_node *node = set->rb_root.rb_node;
git://wimlib.net / wimlib / blobdiff