started on mib3 kdf
This commit is contained in:
Eljakim
parent
da14253312
commit
4c4ae97635
@ -16,3 +16,10 @@ Documentation on Samsung devices, currently mainly the Samsung S7. Here we're ex
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BootROM_8890/03_exploit_boot_chain.rst
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BootROM_8890/04_xen_and_mib3.rst
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BootROM_8890/05_notes.rst
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.. toctree::
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:maxdepth: 2
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:caption: Key derivation:
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key_derivation/index.rst
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314
documentation/source/key_derivation/images/fscrypt.drawio.svg
Normal file
314
documentation/source/key_derivation/images/fscrypt.drawio.svg
Normal file
@ -0,0 +1,314 @@
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fscryptUnlock
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fscryptUnlock
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KeyStoreOpen
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KeyStoreOpen
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get_key_desc
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<text x="750" y="76" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
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get_key_desc
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IOCTL via Kernel
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<text x="858" y="200" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">
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IOCTL via Kernel
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KeyStoreGet
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Key is added to kernel keyring
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||||
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||||
<span style="text-align: left;">
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fscryptKeyAdd
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||||
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||||
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|
||||
OpenHandle
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||||
<br/>
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to
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<br/>
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||||
<span style="text-align: left;">
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/dev/mobicore-userif
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||||
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||||
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||||
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||||
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||||
OpenHandle...
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||||
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||||
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|
||||
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|
||||
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<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
fscrypto
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="260" y="96" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
fscrypto
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
<rect x="1260" y="37" width="160" height="130" fill="#fad9d5" stroke="#ae4132" pointer-events="all"/>
|
||||
<g transform="translate(-0.5 -0.5)">
|
||||
<switch>
|
||||
<foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
|
||||
<div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 158px; height: 1px; padding-top: 102px; margin-left: 1261px;">
|
||||
<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
Kernel
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="1340" y="106" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
Kernel
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
<path d="M 170 107 L 213.63 107" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/>
|
||||
<path d="M 218.88 107 L 211.88 110.5 L 213.63 107 L 211.88 103.5 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/>
|
||||
<ellipse cx="120" cy="107" rx="50" ry="30" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/>
|
||||
<ellipse cx="120" cy="107" rx="46" ry="26" fill="none" stroke="rgb(0, 0, 0)" pointer-events="all"/>
|
||||
<g transform="translate(-0.5 -0.5)">
|
||||
<switch>
|
||||
<foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
|
||||
<div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 90px; height: 1px; padding-top: 107px; margin-left: 75px;">
|
||||
<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
Access File
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="120" y="111" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
Access File
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
<rect x="830" y="297" width="110" height="50" fill="#d0cee2" stroke="#56517e" pointer-events="all"/>
|
||||
<g transform="translate(-0.5 -0.5)">
|
||||
<switch>
|
||||
<foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
|
||||
<div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 108px; height: 1px; padding-top: 322px; margin-left: 831px;">
|
||||
<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
KeyStoreGet
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="885" y="326" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
KeyStoreGet
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
<rect x="10" y="287" width="60" height="30" fill="none" stroke="none" pointer-events="all"/>
|
||||
<g transform="translate(-0.5 -0.5)">
|
||||
<switch>
|
||||
<foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
|
||||
<div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 302px; margin-left: 11px;">
|
||||
<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
Dom1
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="40" y="306" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
Dom1
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
<rect x="1090" y="47" width="110" height="50" fill="#d0cee2" stroke="#56517e" pointer-events="all"/>
|
||||
<g transform="translate(-0.5 -0.5)">
|
||||
<switch>
|
||||
<foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;">
|
||||
<div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 108px; height: 1px; padding-top: 72px; margin-left: 1091px;">
|
||||
<div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;">
|
||||
<div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">
|
||||
<span style="text-align: left;">
|
||||
KeyStoreClose
|
||||
</span>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</foreignObject>
|
||||
<text x="1145" y="76" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">
|
||||
KeyStoreClose
|
||||
</text>
|
||||
</switch>
|
||||
</g>
|
||||
</g>
|
||||
<switch>
|
||||
<g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/>
|
||||
<a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank">
|
||||
<text text-anchor="middle" font-size="10px" x="50%" y="100%">
|
||||
Text is not SVG - cannot display
|
||||
</text>
|
||||
</a>
|
||||
</switch>
|
||||
</svg>
|
||||
|
After Width: | Height: | Size: 26 KiB |
71
documentation/source/key_derivation/index.rst
Normal file
71
documentation/source/key_derivation/index.rst
Normal file
@ -0,0 +1,71 @@
|
||||
===================
|
||||
MIB3 Key derivation
|
||||
===================
|
||||
This section is dedicated to the key derivation process on the MIB3 High (VAG) head unit.
|
||||
|
||||
As per this:
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
void fscryptUnlock(char *path)
|
||||
|
||||
{
|
||||
int iVar1;
|
||||
1.
|
||||
local_8 = ___stack_chk_guard;
|
||||
fprintf(_stdout,"Call to fscryptUnlock with Path %s\n",path,&stdout,0);
|
||||
iVar1 = waitfor_timeout("/dev/mobicore-userif",0xffffffffffffffff,0xffffffffffffffff,1);
|
||||
if (iVar1 == 0) {
|
||||
iVar1 = get_key_desc?(path,&local_60);
|
||||
if (iVar1 == 0) {
|
||||
iVar2 = KeyStoreOpen();
|
||||
if (iVar2 == 0) {
|
||||
iVar2 = KeyStoreGet(&local_60,0x10,&local_48,0x40);
|
||||
if (iVar2 == 0) {
|
||||
KeyStoreClose();
|
||||
iVar2 = fscryptKeyAdd(&local_48,&local_60);
|
||||
if (iVar2 < 0) {
|
||||
iVar1 = -5;
|
||||
fscryptKeyWipe(&local_48,0x40);
|
||||
}
|
||||
else {
|
||||
fscryptKeyWipe(&local_48,0x40);
|
||||
}
|
||||
}
|
||||
else {
|
||||
KeyStoreClose();
|
||||
iVar1 = -3;
|
||||
}
|
||||
}
|
||||
else {
|
||||
iVar1 = -3;
|
||||
perror("Failed to connect to TEE");
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
iVar1 = -3;
|
||||
fwrite("Failed to wait for kinibi interface\n",1,0x24,_stderr);
|
||||
}
|
||||
if (local_8 == ___stack_chk_guard) {
|
||||
return;
|
||||
}
|
||||
/* WARNING: Subroutine does not return */
|
||||
__stack_chk_fail(iVar1);
|
||||
}
|
||||
|
||||
Or in a diagram:
|
||||
|
||||
.. figure:: images/fscrypt.drawio.svg
|
||||
|
||||
|
||||
|
||||
|
||||
.. code-block:: c
|
||||
|
||||
void KeyStoreGet(void *key_id,uint id_len,void *key_buffer,uint key_len)
|
||||
|
||||
|
||||
TODO:
|
||||
|
||||
* What is located at ``/dev/mobicore-userif`` in domu1?
|
||||
Loading…
Reference in New Issue
Block a user