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ntfs-3g/ntfsprogs/sd.c
flatcap 7a142ef54c got bored. don't read the diffs.
2005-07-06 22:47:01 +00:00

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#include "types.h"
#include "layout.h"
/**
* init_system_file_sd
*
* NTFS 1.2 - System files security descriptors
* ===========================================
*
* Create the security descriptor for system file number @sys_file_no and
* return a pointer to the descriptor.
*
* $MFT, $MFTMirr, $LogFile, $AttrDef, $Bitmap, $Boot, $BadClus, and $UpCase
* are the same.
*
* $Volume, $Quota, and system files 0xb-0xf are the same. They are almost the
* same as the above, the only difference being that the two SIDs present in
* the DACL grant GENERIC_WRITE and GENERIC_READ equivalent privileges while
* the above only grant GENERIC_READ equivalent privileges. (For some reason
* the flags for GENERIC_READ/GENERIC_WRITE are not set by NT4, even though
* the permissions are equivalent, so we comply.
*
* Root directory system file (".") is different altogether.
*
* The sd is returned in *@sd_val and has length *@sd_val_len.
*
* Do NOT free *@sd_val as it is static memory. This also means that you can
* only use *@sd_val until the next call to this function.
*/
void init_system_file_sd(int sys_file_no, u8 **sd_val, int *sd_val_len);
void init_system_file_sd(int sys_file_no, u8 **sd_val, int *sd_val_len)
{
static u8 sd_array[0x68];
SECURITY_DESCRIPTOR_RELATIVE *sd;
ACL *acl;
ACCESS_ALLOWED_ACE *aa_ace;
SID *sid;
if (sys_file_no < 0 || sys_file_no > 0xf) {
*sd_val = NULL;
*sd_val_len = 0;
return;
}
*sd_val = sd_array;
sd = (SECURITY_DESCRIPTOR_RELATIVE*)&sd_array;
sd->revision = 1;
sd->alignment = 0;
sd->control = SE_SELF_RELATIVE | SE_DACL_PRESENT;
if (sys_file_no == FILE_root) {
*sd_val_len = 0x50;
sd->owner = cpu_to_le32(0x30);
sd->group = cpu_to_le32(0x40);
} else {
*sd_val_len = 0x68;
sd->owner = cpu_to_le32(0x48);
sd->group = cpu_to_le32(0x58);
}
sd->sacl = cpu_to_le32(0);
sd->dacl = cpu_to_le32(0x14);
/*
* Now at offset 0x14, as specified in the security descriptor, we have
* the DACL.
*/
acl = (ACL*)((char*)sd + le32_to_cpu(sd->dacl));
acl->revision = 2;
acl->alignment1 = 0;
if (sys_file_no == FILE_root) {
acl->size = cpu_to_le16(0x1c);
acl->ace_count = cpu_to_le16(1);
} else {
acl->size = cpu_to_le16(0x34);
acl->ace_count = cpu_to_le16(2);
}
acl->alignment2 = cpu_to_le16(0);
/*
* Now at offset 0x1c, just after the DACL's ACL, we have the first
* ACE of the DACL. The type of the ACE is access allowed.
*/
aa_ace = (ACCESS_ALLOWED_ACE*)((char*)acl + sizeof(ACL));
aa_ace->type = ACCESS_ALLOWED_ACE_TYPE;
if (sys_file_no == FILE_root)
aa_ace->flags = CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE;
else
aa_ace->flags = 0;
aa_ace->size = cpu_to_le16(0x14);
switch (sys_file_no) {
case FILE_MFT: case FILE_MFTMirr: case FILE_LogFile:
case FILE_AttrDef: case FILE_Bitmap: case FILE_Boot:
case FILE_BadClus: case FILE_UpCase:
aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
FILE_READ_ATTRIBUTES | FILE_READ_EA | FILE_READ_DATA;
break;
case FILE_Volume: case FILE_Secure: case 0xb ... 0xf:
aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_WRITE |
FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
FILE_WRITE_EA | FILE_READ_EA | FILE_APPEND_DATA |
FILE_WRITE_DATA | FILE_READ_DATA;
break;
case FILE_root:
aa_ace->mask = STANDARD_RIGHTS_ALL | FILE_WRITE_ATTRIBUTES |
FILE_READ_ATTRIBUTES | FILE_DELETE_CHILD |
FILE_TRAVERSE | FILE_WRITE_EA | FILE_READ_EA |
FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE |
FILE_LIST_DIRECTORY;
break;
}
aa_ace->sid.revision = 1;
aa_ace->sid.sub_authority_count = 1;
aa_ace->sid.identifier_authority.value[0] = 0;
aa_ace->sid.identifier_authority.value[1] = 0;
aa_ace->sid.identifier_authority.value[2] = 0;
aa_ace->sid.identifier_authority.value[3] = 0;
aa_ace->sid.identifier_authority.value[4] = 0;
if (sys_file_no == FILE_root) {
/* SECURITY_WORLD_SID_AUTHORITY (S-1-1) */
aa_ace->sid.identifier_authority.value[5] = 1;
aa_ace->sid.sub_authority[0] =
cpu_to_le32(SECURITY_WORLD_RID);
/* This is S-1-1-0, the WORLD_SID. */
} else {
/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
aa_ace->sid.identifier_authority.value[5] = 5;
aa_ace->sid.sub_authority[0] =
cpu_to_le32(SECURITY_LOCAL_SYSTEM_RID);
}
/*
* Now at offset 0x30 within security descriptor, just after the first
* ACE of the DACL. All system files, except the root directory, have
* a second ACE.
*/
if (sys_file_no != FILE_root) {
/* The second ACE of the DACL. Type is access allowed. */
aa_ace = (ACCESS_ALLOWED_ACE*)((char*)aa_ace +
le16_to_cpu(aa_ace->size));
aa_ace->type = ACCESS_ALLOWED_ACE_TYPE;
aa_ace->flags = 0;
aa_ace->size = cpu_to_le16(0x18);
switch (sys_file_no) {
case FILE_MFT: case FILE_MFTMirr:
case FILE_LogFile: case FILE_AttrDef:
case FILE_Bitmap: case FILE_Boot:
case FILE_BadClus: case FILE_UpCase:
aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
FILE_READ_ATTRIBUTES | FILE_READ_EA |
FILE_READ_DATA;
break;
case FILE_Volume: case FILE_Secure:
case 0xb ... 0xf:
aa_ace->mask = SYNCHRONIZE | STANDARD_RIGHTS_READ |
FILE_WRITE_ATTRIBUTES |
FILE_READ_ATTRIBUTES | FILE_WRITE_EA |
FILE_READ_EA | FILE_APPEND_DATA |
FILE_WRITE_DATA | FILE_READ_DATA;
break;
}
aa_ace->sid.revision = 1;
aa_ace->sid.sub_authority_count = 2;
/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
aa_ace->sid.identifier_authority.value[0] = 0;
aa_ace->sid.identifier_authority.value[1] = 0;
aa_ace->sid.identifier_authority.value[2] = 0;
aa_ace->sid.identifier_authority.value[3] = 0;
aa_ace->sid.identifier_authority.value[4] = 0;
aa_ace->sid.identifier_authority.value[5] = 5;
aa_ace->sid.sub_authority[0] =
cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
aa_ace->sid.sub_authority[1] =
cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
/* Now at offset 0x48 into the security descriptor. */
}
/* As specified in the security descriptor, we now have the owner SID.*/
sid = (SID*)((char*)sd + le32_to_cpu(sd->owner));
sid->revision = 1;
sid->sub_authority_count = 2;
/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
sid->identifier_authority.value[0] = 0;
sid->identifier_authority.value[1] = 0;
sid->identifier_authority.value[2] = 0;
sid->identifier_authority.value[3] = 0;
sid->identifier_authority.value[4] = 0;
sid->identifier_authority.value[5] = 5;
sid->sub_authority[0] = cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
sid->sub_authority[1] = cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
/*
* Now at offset 0x40 or 0x58 (root directory and the other system
* files, respectively) into the security descriptor, as specified in
* the security descriptor, we have the group SID.
*/
sid = (SID*)((char*)sd + le32_to_cpu(sd->group));
sid->revision = 1;
sid->sub_authority_count = 2;
/* SECURITY_NT_SID_AUTHORITY (S-1-5) */
sid->identifier_authority.value[0] = 0;
sid->identifier_authority.value[1] = 0;
sid->identifier_authority.value[2] = 0;
sid->identifier_authority.value[3] = 0;
sid->identifier_authority.value[4] = 0;
sid->identifier_authority.value[5] = 5;
sid->sub_authority[0] = cpu_to_le32(SECURITY_BUILTIN_DOMAIN_RID);
sid->sub_authority[1] = cpu_to_le32(DOMAIN_ALIAS_RID_ADMINS);
}
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