X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fsecurity.c;h=e6a7e93a84d6001ed47f55afdfdfd8d3e2c1f395;hp=d5fbcbb7db1d6d75501b4767ceb6924b1349b190;hb=76b57cc8cf113194136a7e264644a37515650ccc;hpb=c73468ab9d94f48a801008ea4fb15de6880c44e8 diff --git a/src/security.c b/src/security.c index d5fbcbb7..e6a7e93a 100644 --- a/src/security.c +++ b/src/security.c @@ -5,7 +5,7 @@ */ /* - * 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. * @@ -28,10 +28,10 @@ #endif #include "wimlib/assert.h" +#include "wimlib/avl_tree.h" #include "wimlib/endianness.h" #include "wimlib/error.h" #include "wimlib/security.h" -#include "wimlib/security_descriptor.h" #include "wimlib/sha1.h" #include "wimlib/util.h" @@ -50,12 +50,13 @@ 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. - * @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. @@ -66,7 +67,7 @@ new_wim_security_data(void) * 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; @@ -77,14 +78,14 @@ read_wim_security_data(const u8 metadata_resource[], size_t metadata_resource_le const struct wim_security_data_disk *sd_disk; const u8 *p; - if (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_disk = (const struct wim_security_data_disk *)buf; sd->total_length = le32_to_cpu(sd_disk->total_length); sd->num_entries = le32_to_cpu(sd_disk->num_entries); @@ -112,7 +113,7 @@ read_wim_security_data(const u8 metadata_resource[], size_t metadata_resource_le * 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); @@ -215,116 +216,6 @@ write_wim_security_data(const struct wim_security_data * restrict sd, return p; } -static void -print_acl(const wimlib_ACL *acl, const tchar *type, size_t max_size) -{ - const u8 *p; - - if (max_size < sizeof(wimlib_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(wimlib_ACL); - for (u16 i = 0; i < ace_count; i++) { - if (max_size < p + sizeof(wimlib_ACCESS_ALLOWED_ACE) - (const u8*)acl) - break; - const wimlib_ACCESS_ALLOWED_ACE *aaa = (const wimlib_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 wimlib_SID *sid, const tchar *type, size_t max_size) -{ - if (max_size < sizeof(wimlib_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(wimlib_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 wimlib_SECURITY_DESCRIPTOR_RELATIVE *descr, - size_t size) -{ - u8 revision = descr->revision; - u16 control = le16_to_cpu(descr->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 wimlib_SID*)((const u8*)descr + owner_offset), - T("Owner"), size - owner_offset); - - if (group_offset != 0 && group_offset <= size) - print_sid((const wimlib_SID*)((const u8*)descr + group_offset), - T("Group"), size - group_offset); - - if (dacl_offset != 0 && dacl_offset <= size) - print_acl((const wimlib_ACL*)((const u8*)descr + dacl_offset), - T("Discretionary"), size - dacl_offset); - - if (sacl_offset != 0 && sacl_offset <= size) - print_acl((const wimlib_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 wimlib_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) { @@ -341,79 +232,72 @@ free_wim_security_data(struct wim_security_data *sd) } struct sd_node { - int security_id; + int32_t 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. */ -static int +static int32_t 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; } /* @@ -423,11 +307,11 @@ lookup_sd(struct wim_sd_set *set, const u8 hash[SHA1_HASH_SIZE]) * the security ID for it. If a new security descriptor cannot be allocated, * return -1. */ -int +int32_t sd_set_add_sd(struct wim_sd_set *sd_set, const char *descriptor, size_t size) { u8 hash[SHA1_HASH_SIZE]; - int security_id; + int32_t security_id; struct sd_node *new; u8 **descriptors; u64 *sizes; @@ -494,7 +378,7 @@ init_sd_set(struct wim_sd_set *sd_set, struct wim_security_data *sd) 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. */ @@ -515,7 +399,7 @@ init_sd_set(struct wim_sd_set *sd_set, struct wim_security_data *sd) ret = 0; goto out; out_destroy_sd_set: - destroy_sd_set(sd_set, false); + destroy_sd_set(sd_set); out: return ret; }