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202 lines
6.9 KiB
C
202 lines
6.9 KiB
C
#include "types.h"
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#include "layout.h"
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/**
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* init_system_file_sd
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*
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* NTFS 1.2 - System files security decriptors
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* ===========================================
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*
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* Create the security descriptor for system file number @sys_file_no and
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* return a pointer to the descriptor.
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*
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* $MFT, $MFTMirr, $LogFile, $AttrDef, $Bitmap, $Boot, $BadClus, and $UpCase
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* are the same.
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*
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* $Volume, $Quota, and system files 0xb-0xf are the same. They are almost the
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* same as the above, the only difference being that the two SIDs present in
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* the DACL grant GENERIC_WRITE and GENERIC_READ equivalent priviledges while
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* the above only grant GENERIC_READ equivalent priviledges. (For some reason
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* the flags for GENERIC_READ/GENERIC_WRITE are not set by NT4, even though
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* the permissions are equivalent, so we comply.
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*
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* Root directory system file (".") is different altogether.
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*
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* The sd is recturned in *@sd_val and has length *@sd_val_len.
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*
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* Do NOT free *@sd_val as it is static memory. This also means that you can
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* only use *@sd_val until the next call to this function.
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*/
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void init_system_file_sd(int sys_file_no, char **sd_val, int *sd_val_len)
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{
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static char sd_array[0x68];
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SECURITY_DESCRIPTOR_RELATIVE *sd;
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ACL *acl;
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ACCESS_ALLOWED_ACE *aa_ace;
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SID *sid;
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if (sys_file_no < 0 || sys_file_no > 0xf) {
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*sd_val = NULL;
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*sd_val_len = 0;
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return;
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}
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*sd_val = (char*)&sd_array;
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sd = (SECURITY_DESCRIPTOR_RELATIVE*)&sd_array;
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sd->revision = 1;
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sd->alignment = 0;
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sd->control = SE_SELF_RELATIVE | SE_DACL_PRESENT;
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if (sys_file_no == FILE_root) {
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*sd_val_len = 0x50;
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sd->owner = cpu_to_le32(0x30);
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sd->group = cpu_to_le32(0x40);
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} else {
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*sd_val_len = 0x68;
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sd->owner = cpu_to_le32(0x48);
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sd->group = cpu_to_le32(0x58);
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}
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sd->sacl = cpu_to_le32(0);
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sd->dacl = cpu_to_le32(0x14);
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/*
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* Now at offset 0x14, as specified in the security descriptor, we have
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* the DACL.
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*/
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acl = (ACL*)((char*)sd + le32_to_cpu(sd->dacl));
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acl->revision = 2;
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acl->alignment1 = 0;
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if (sys_file_no == FILE_root) {
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acl->size = cpu_to_le16(0x1c);
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acl->ace_count = cpu_to_le16(1);
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} else {
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acl->size = cpu_to_le16(0x34);
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acl->ace_count = cpu_to_le16(2);
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}
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acl->alignment2 = cpu_to_le16(0);
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/*
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* Now at offset 0x1c, just after the DACL's ACL, we have the first
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* ACE of the DACL. The type of the ACE is access allowed.
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*/
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aa_ace = (ACCESS_ALLOWED_ACE*)((char*)acl + sizeof(ACL));
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aa_ace->type = ACCESS_ALLOWED_ACE_TYPE;
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if (sys_file_no == FILE_root)
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aa_ace->flags = CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE;
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else
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aa_ace->flags = 0;
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aa_ace->size = cpu_to_le16(0x14);
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switch (sys_file_no) {
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case FILE_MFT: case FILE_MFTMirr: case FILE_LogFile:
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case FILE_AttrDef: case FILE_Bitmap: case FILE_Boot:
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case FILE_BadClus: case FILE_UpCase:
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aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
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FILE_READ_ATTRIBUTES | FILE_READ_EA | FILE_READ_DATA;
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break;
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case FILE_Volume: case FILE_Secure: case 0xb ... 0xf:
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aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_WRITE |
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FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
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FILE_WRITE_EA | FILE_READ_EA | FILE_APPEND_DATA |
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FILE_WRITE_DATA | FILE_READ_DATA;
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break;
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case FILE_root:
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aa_ace->mask = STANDARD_RIGHTS_ALL | FILE_WRITE_ATTRIBUTES |
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FILE_READ_ATTRIBUTES | FILE_DELETE_CHILD |
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FILE_TRAVERSE | FILE_WRITE_EA | FILE_READ_EA |
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FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE |
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FILE_LIST_DIRECTORY;
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break;
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}
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aa_ace->sid.revision = 1;
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aa_ace->sid.sub_authority_count = 1;
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aa_ace->sid.identifier_authority.value[0] = 0;
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aa_ace->sid.identifier_authority.value[1] = 0;
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aa_ace->sid.identifier_authority.value[2] = 0;
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aa_ace->sid.identifier_authority.value[3] = 0;
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aa_ace->sid.identifier_authority.value[4] = 0;
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if (sys_file_no == FILE_root) {
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/* SECURITY_WORLD_SID_AUTHORITY (S-1-1) */
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aa_ace->sid.identifier_authority.value[5] = 1;
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aa_ace->sid.sub_authority[0] =
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cpu_to_le32(SECURITY_WORLD_RID);
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/* This is S-1-1-0, the WORLD_SID. */
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} else {
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/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
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aa_ace->sid.identifier_authority.value[5] = 5;
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aa_ace->sid.sub_authority[0] =
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cpu_to_le32(SECURITY_LOCAL_SYSTEM_RID);
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}
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/*
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* Now at offset 0x30 within security descriptor, just after the first
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* ACE of the DACL. All system files, except the root directory, have
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* a second ACE.
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*/
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if (sys_file_no != FILE_root) {
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/* The second ACE of the DACL. Type is access allowed. */
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aa_ace = (ACCESS_ALLOWED_ACE*)((char*)aa_ace +
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le16_to_cpu(aa_ace->size));
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aa_ace->type = ACCESS_ALLOWED_ACE_TYPE;
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aa_ace->flags = 0;
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aa_ace->size = cpu_to_le16(0x18);
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switch (sys_file_no) {
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case FILE_MFT: case FILE_MFTMirr:
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case FILE_LogFile: case FILE_AttrDef:
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case FILE_Bitmap: case FILE_Boot:
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case FILE_BadClus: case FILE_UpCase:
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aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
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FILE_READ_ATTRIBUTES | FILE_READ_EA |
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FILE_READ_DATA;
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break;
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case FILE_Volume: case FILE_Secure:
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case 0xb ... 0xf:
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aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
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FILE_WRITE_ATTRIBUTES |
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FILE_READ_ATTRIBUTES | FILE_WRITE_EA |
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FILE_READ_EA | FILE_APPEND_DATA |
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FILE_WRITE_DATA | FILE_READ_DATA;
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break;
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}
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aa_ace->sid.revision = 1;
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aa_ace->sid.sub_authority_count = 2;
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/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
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aa_ace->sid.identifier_authority.value[0] = 0;
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aa_ace->sid.identifier_authority.value[1] = 0;
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aa_ace->sid.identifier_authority.value[2] = 0;
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aa_ace->sid.identifier_authority.value[3] = 0;
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aa_ace->sid.identifier_authority.value[4] = 0;
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aa_ace->sid.identifier_authority.value[5] = 5;
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aa_ace->sid.sub_authority[0] =
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cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
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aa_ace->sid.sub_authority[1] =
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cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
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/* Now at offset 0x48 into the security descriptor. */
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}
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/* As specified in the security descriptor, we now have the owner SID.*/
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sid = (SID*)((char*)sd + le32_to_cpu(sd->owner));
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sid->revision = 1;
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sid->sub_authority_count = 2;
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/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
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sid->identifier_authority.value[0] = 0;
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sid->identifier_authority.value[1] = 0;
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sid->identifier_authority.value[2] = 0;
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sid->identifier_authority.value[3] = 0;
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sid->identifier_authority.value[4] = 0;
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sid->identifier_authority.value[5] = 5;
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sid->sub_authority[0] = cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
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sid->sub_authority[1] = cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
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/*
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* Now at offset 0x40 or 0x58 (root directory and the other system
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* files, respectively) into the security descriptor, as specified in
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* the security descriptor, we have the group SID.
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*/
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sid = (SID*)((char*)sd + le32_to_cpu(sd->group));
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sid->revision = 1;
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sid->sub_authority_count = 2;
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/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
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sid->identifier_authority.value[0] = 0;
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sid->identifier_authority.value[1] = 0;
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sid->identifier_authority.value[2] = 0;
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sid->identifier_authority.value[3] = 0;
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sid->identifier_authority.value[4] = 0;
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sid->identifier_authority.value[5] = 5;
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sid->sub_authority[0] = cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
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sid->sub_authority[1] = cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
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}
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