*/
/*
- * Copyright (C) 2012 Eric Biggers
+ * Copyright (C) 2012, 2013 Eric Biggers
*
* This file is part of wimlib, a library for working with WIM files.
*
#include "buffer_io.h"
#include "security.h"
+/* At the start of each type of access control entry. */
+typedef struct {
+ /* 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. */
+ u8 size;
+} ACEHeader;
+
+/* Grants rights to a user or group */
+typedef struct {
+ ACEHeader hdr;
+ u32 mask;
+ u32 sid_start;
+} AccessAllowedACE;
+
+/* Denies rights to a user or group */
+typedef struct {
+ ACEHeader hdr;
+ u32 mask;
+ u32 sid_start;
+} AccessDeniedACE;
+
+typedef struct {
+ ACEHeader hdr;
+ u32 mask;
+ u32 sid_start;
+} SystemAuditACE;
+
+
+/* Header of an access control list. */
+typedef struct {
+ /* ACL_REVISION or ACL_REVISION_DS */
+ u8 revision;
+
+ /* padding */
+ u8 sbz1;
+
+ /* Total size of the ACL, including all access control entries */
+ u16 acl_size;
+
+ /* Number of access control entry structures that follow the ACL
+ * structure. */
+ u16 ace_count;
+
+ /* padding */
+ u16 sbz2;
+} ACL;
+
+/* A structure used to identify users or groups. */
+typedef struct {
+
+ /* 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];
+
+ u32 sub_authority[0];
+} SID;
+
+
+typedef struct {
+ /* Example: 0x1 */
+ u8 revision;
+ /* Example: 0x0 */
+ u8 sbz1;
+ /* Example: 0x4149 */
+ u16 security_descriptor_control;
+
+ /* Offset of a SID structure in the security descriptor. */
+ /* Example: 0x14 */
+ u32 owner_offset;
+
+ /* Offset of a SID structure in the security descriptor. */
+ /* Example: 0x24 */
+ u32 group_offset;
+
+ /* Offset of an ACL structure in the security descriptor. */
+ /* System ACL. */
+ /* Example: 0x00 */
+ u32 sacl_offset;
+
+ /* Offset of an ACL structure in the security descriptor. */
+ /* Discretionary ACL. */
+ /* Example: 0x34 */
+ u32 dacl_offset;
+} SecurityDescriptor;
+
/*
* This is a hack to work around a problem in libntfs-3g. libntfs-3g validates
* security descriptors with a function named ntfs_valid_descr().
* entries anyway; however this ensures that that the security descriptors pass
* the validation in libntfs-3g.
*/
-static void empty_sacl_fixup(u8 *descr, u64 *size_p)
+static void
+empty_sacl_fixup(u8 *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(SecurityDescriptor)) {
SecurityDescriptor *sd = (SecurityDescriptor*)descr;
u32 sacl_offset = le32_to_cpu(sd->sacl_offset);
*size_p -= sizeof(ACL);
}
}
+#endif
}
/*
* Note: There is no `offset' argument because the security data is located at
* the beginning of the metadata resource.
*/
-int read_security_data(const u8 metadata_resource[], u64 metadata_resource_len,
- struct wim_security_data **sd_p)
+int
+read_security_data(const u8 metadata_resource[], u64 metadata_resource_len,
+ struct wim_security_data **sd_p)
{
struct wim_security_data *sd;
const u8 *p;
/*
* Writes security data to an in-memory buffer.
*/
-u8 *write_security_data(const struct wim_security_data *sd, u8 *p)
+u8 *
+write_security_data(const struct wim_security_data *sd, u8 *p)
{
DEBUG("Writing security data (total_length = %"PRIu32", num_entries "
"= %"PRIu32")", sd->total_length, sd->num_entries);
return p;
}
-static void print_acl(const u8 *p, const char *type)
+static void
+print_acl(const void *p, const tchar *type)
{
- const ACL *acl = (const ACL*)p;
+ const ACL *acl = p;
u8 revision = acl->revision;
u16 acl_size = le16_to_cpu(acl->acl_size);
u16 ace_count = le16_to_cpu(acl->ace_count);
- printf(" [%s ACL]\n", type);
- printf(" Revision = %u\n", revision);
- printf(" ACL Size = %u\n", acl_size);
- printf(" ACE Count = %u\n", 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 += sizeof(ACL);
for (u16 i = 0; i < ace_count; i++) {
- const ACEHeader *hdr = (const ACEHeader*)p;
- printf(" [ACE]\n");
- printf(" ACE type = %d\n", hdr->type);
- printf(" ACE flags = 0x%x\n", hdr->flags);
- printf(" ACE size = %u\n", hdr->size);
+ const ACEHeader *hdr = p;
+ tprintf(T(" [ACE]\n"));
+ tprintf(T(" ACE type = %d\n"), hdr->type);
+ tprintf(T(" ACE flags = 0x%x\n"), hdr->flags);
+ tprintf(T(" ACE size = %u\n"), hdr->size);
const AccessAllowedACE *aaa = (const AccessAllowedACE*)hdr;
- printf(" ACE mask = %x\n", le32_to_cpu(aaa->mask));
- printf(" SID start = %u\n", le32_to_cpu(aaa->sid_start));
+ tprintf(T(" ACE mask = %x\n"), le32_to_cpu(aaa->mask));
+ tprintf(T(" SID start = %u\n"), le32_to_cpu(aaa->sid_start));
p += hdr->size;
}
- putchar('\n');
+ tputchar(T('\n'));
}
-static void print_sid(const u8 *p, const char *type)
+static void
+print_sid(const void *p, const tchar *type)
{
- const SID *sid = (const SID*)p;
- printf(" [%s SID]\n", type);
- printf(" Revision = %u\n", sid->revision);
- printf(" Subauthority count = %u\n", sid->sub_authority_count);
- printf(" Identifier authority = ");
+ const SID *sid = p;
+ 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));
- putchar('\n');
- for (u8 i = 0; i < sid->sub_authority_count; i++)
- printf(" Subauthority %u = %u\n",
- i, le32_to_cpu(sid->sub_authority[i]));
- putchar('\n');
+ tputchar(T('\n'));
+ 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 u8 *p, u64 size)
+static void
+print_security_descriptor(const void *p, u64 size)
{
- const SecurityDescriptor *sd = (const SecurityDescriptor*)p;
+ const SecurityDescriptor *sd = p;
+
u8 revision = sd->revision;
u16 control = le16_to_cpu(sd->security_descriptor_control);
u32 owner_offset = le32_to_cpu(sd->owner_offset);
u32 group_offset = le32_to_cpu(sd->group_offset);
u32 sacl_offset = le32_to_cpu(sd->sacl_offset);
u32 dacl_offset = le32_to_cpu(sd->dacl_offset);
- printf("Revision = %u\n", revision);
- printf("Security Descriptor Control = %#x\n", control);
- printf("Owner offset = %u\n", owner_offset);
- printf("Group offset = %u\n", group_offset);
- printf("System ACL offset = %u\n", sacl_offset);
- printf("Discretionary ACL offset = %u\n", dacl_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("System ACL offset = %u\n"), sacl_offset);
+ tprintf(T("Discretionary ACL offset = %u\n"), dacl_offset);
if (sd->owner_offset != 0)
- print_sid(p + owner_offset, "Owner");
+ print_sid(p + owner_offset, T("Owner"));
if (sd->group_offset != 0)
- print_sid(p + group_offset, "Group");
+ print_sid(p + group_offset, T("Group"));
if (sd->sacl_offset != 0)
- print_acl(p + sacl_offset, "System");
+ print_acl(p + sacl_offset, T("System"));
if (sd->dacl_offset != 0)
- print_acl(p + dacl_offset, "Discretionary");
+ print_acl(p + dacl_offset, T("Discretionary"));
}
/*
* Prints the security data for a WIM file.
*/
-void print_security_data(const struct wim_security_data *sd)
+void
+print_security_data(const struct wim_security_data *sd)
{
wimlib_assert(sd != NULL);
- puts("[SECURITY DATA]");
- printf("Length = %"PRIu32" bytes\n", sd->total_length);
- printf("Number of Entries = %"PRIu32"\n", sd->num_entries);
+ 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++) {
- printf("[SecurityDescriptor %"PRIu32", length = %"PRIu64"]\n",
- i, sd->sizes[i]);
+ tprintf(T("[SecurityDescriptor %"PRIu32", length = %"PRIu64"]\n"),
+ i, sd->sizes[i]);
print_security_descriptor(sd->descriptors[i], sd->sizes[i]);
- putchar('\n');
+ tputchar(T('\n'));
}
- putchar('\n');
+ tputchar(T('\n'));
}
-void free_security_data(struct wim_security_data *sd)
+void
+free_security_data(struct wim_security_data *sd)
{
if (sd) {
wimlib_assert(sd->refcnt != 0);
}
}
}
+
+struct sd_node {
+ int security_id;
+ u8 hash[SHA1_HASH_SIZE];
+ struct rb_node rb_node;
+};
+
+static void
+free_sd_tree(struct rb_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));
+ }
+}
+
+/* Frees a security descriptor index set. */
+void
+destroy_sd_set(struct sd_set *sd_set)
+{
+ free_sd_tree(sd_set->rb_root.rb_node);
+}
+
+/* Inserts a a new node into the security descriptor index tree. */
+static void
+insert_sd_node(struct 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
+ wimlib_assert(0); /* Duplicate SHA1 message digest */
+ }
+ rb_link_node(&new->rb_node, rb_parent, p);
+ rb_insert_color(&new->rb_node, root);
+}
+
+/* Returns the index of the security descriptor having a SHA1 message digest of
+ * @hash. If not found, return -1. */
+int
+lookup_sd(struct 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;
+}
+
+/*
+ * Adds a security descriptor to the indexed security descriptor set as well as
+ * the corresponding `struct wim_security_data', and returns the new security
+ * ID; or, if there is an existing security descriptor that is the same, return
+ * the security ID for it. If a new security descriptor cannot be allocated,
+ * return -1.
+ */
+int
+sd_set_add_sd(struct sd_set *sd_set, const char descriptor[], size_t size)
+{
+ u8 hash[SHA1_HASH_SIZE];
+ int security_id;
+ struct sd_node *new;
+ u8 **descriptors;
+ u64 *sizes;
+ u8 *descr_copy;
+ struct wim_security_data *sd;
+
+ sha1_buffer((const u8*)descriptor, size, hash);
+
+ security_id = lookup_sd(sd_set, hash);
+ if (security_id >= 0) /* Identical descriptor already exists */
+ return security_id;
+
+ /* Need to add a new security descriptor */
+ new = MALLOC(sizeof(*new));
+ if (!new)
+ goto out;
+ descr_copy = MALLOC(size);
+ if (!descr_copy)
+ goto out_free_node;
+
+ sd = sd_set->sd;
+
+ memcpy(descr_copy, descriptor, size);
+ new->security_id = sd->num_entries;
+ copy_hash(new->hash, hash);
+
+ descriptors = REALLOC(sd->descriptors,
+ (sd->num_entries + 1) * sizeof(sd->descriptors[0]));
+ if (!descriptors)
+ goto out_free_descr;
+ sd->descriptors = descriptors;
+ sizes = REALLOC(sd->sizes,
+ (sd->num_entries + 1) * sizeof(sd->sizes[0]));
+ if (!sizes)
+ goto out_free_descr;
+ sd->sizes = sizes;
+ sd->descriptors[sd->num_entries] = descr_copy;
+ sd->sizes[sd->num_entries] = size;
+ sd->num_entries++;
+ DEBUG("There are now %d security descriptors", sd->num_entries);
+ sd->total_length += size + sizeof(sd->sizes[0]);
+ insert_sd_node(sd_set, new);
+ return new->security_id;
+out_free_descr:
+ FREE(descr_copy);
+out_free_node:
+ FREE(new);
+out:
+ return -1;
+}
git://wimlib.net / wimlib / blobdiff