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Unlike PS3, where every part of per-console security (including the HDD) is dictated by the eid_root_key, PS4 has two per-console keys for the HDD, one handled by SAMU (we cannot obtain this key at this moment) and the other handled by the [[Southbridge]] which can be obtained.
Unlike PS3, where every part of per-console security (including the HDD) is dictated by the eid_root_key, PS4 has two per-console keys for the HDD, one handled by SAMU (we cannot obtain this key atm) and the other handled by the South Bridge (Aeolia / Belize) which can be obtained.


Here are described the steps to mount a PS4 HDD on PC using the cryptmount utility on Linux.
Here are described the steps to mount a PS4 HDD on PC using the cryptmount utility on Linux.
= Partitions that can be mounted =
* preinst, preinst2, system, system(b), system_ex, system_ex(b) cannot be mounted as they use a key hidden in SAMU not eap_hdd_key. Cryptmount returns error device-mapper ioctl when trying with fstype=tmpfs.
* eap_vsh, update, user and eap_user can be mounted using cryptmount and eap_hdd_key.
* eap_kern can be read directly without mounting but anyway it remains an encrypted file that is decrypted by PS4 OS.
* sda13 cannot be mounted for now. Investigation neeeded. It might be system_data partition and so would behave as system and system_ex. It might also be swap partition.
* sda17 and sda19 can be mounted with fstype=tmpfs but they are void. Investigation neeeded.
* app_reserved can be mounted with fstype=tmpfs but it is void. Investigation neeeded.


= Setup =
= Setup =
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== Prerequisites ==
== Prerequisites ==


* Per-console PS4 EAP HDD Key (check in your kernel dump and in https://github.com/Ps3itaTeam/ps4-kexec/blob/master/magic.h kern_off_eap_hdd_key offset)
* Per-console PS4 EAP HDD Key (check in your kernel dump and in hxxps://github.com/Ps3itaTeam/ps4-kexec/blob/master/magic.h kern_off_eap_hdd_key offset)
* A PC running a Linux Distribution (ex: ubuntu, xubuntu live) that supports cryptmount
* A PC running a Linux Distribution (ex: ubuntu, xubuntu live) that supports cryptmount


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40 00 30 50 DE DB 76 EC 5A D3 D2 8B B3 86 60 D2
40 00 30 50 DE DB 76 EC 5A D3 D2 8B B3 86 60 D2
6B FA DD 0A 1F 3C 03 4B 59 A8 3D 44 04 AE D6 15
6B FA DD 0A 1F 3C 03 4B 59 A8 3D 44 04 AE D6 15
</pre>
==== Linux command ====
<pre>
objcopy -I binary -O binary --reverse-bytes=16 dump.bin keys.bin
</pre>
</pre>


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* Add write permission on cmtab file:
* Add write permission on cmtab file:
<pre>
<pre>
sudo chmod 777 /etc/cryptmount/cmtab
sudo chmod 777 /dev/cryptmount/cmtab
</pre>
</pre>


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* Remove write permission on cmtab file:
* Remove write permission on cmtab file:
<pre>
<pre>
sudo chmod 644 /etc/cryptmount/cmtab
sudo chmod 775 /dev/cryptmount/cmtab
</pre>
</pre>
* Mount PS4 "user" partition:
* Mount PS4 "user" partition:
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     cipher=aes-xts-plain64
     cipher=aes-xts-plain64
     ivoffset=25769803776
     ivoffset=25769803776
    keyfile=/home/eap_hdd_key.bin
    keyformat=raw
}
sda17 {
    dev=/dev/sda17
    dir=/home/username/Desktop/sda17
    flags=user,nofsck
    fstype=tmpfs mountoptions=ro,noatime,noexec
    cipher=aes-xts-plain64
    ivoffset=68719476736
    keyfile=/home/eap_hdd_key.bin
    keyformat=raw
}
sda19 {
    dev=/dev/sda19
    dir=/home/username/Desktop/sda19
    flags=user,nofsck
    fstype=tmpfs mountoptions=ro,noatime,noexec
    cipher=aes-xts-plain64
    ivoffset=77309411328
     keyfile=/home/eap_hdd_key.bin
     keyfile=/home/eap_hdd_key.bin
     keyformat=raw
     keyformat=raw
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     keyformat=raw
     keyformat=raw
}
}
app_reserved {
    dev=/dev/sda31
    dir=/home/username/Desktop/app_reserved
    flags=user,nofsck
    fstype=tmpfs mountoptions=ro,noatime,noexec
    cipher=aes-xts-plain64
    ivoffset=128849018880
    keyfile=/home/eap_hdd_key.bin
    keyformat=raw
}
</pre>
= Files management =
== Read-only ==
UFS filesystem only allows to be mounted as read-only on Debian and Ubuntu. To enable read-write mounting, it is needed to either compile Linux kernel with ufs write flag enabled or to share the raw partition from Debian/Ubuntu to FreeBSD/equivalent running in a virtual machine (ex: VirtualBox).
This is not easy to setup, so better use a PS4 kernel exploit to get write access on PS4, and for example use FTP to conveniently write to the desired partition.
== root owner ==
When partitions are mounted to folders using cryptmount, these folders and files are owned by root. This can be annoying because it is required to use sudo to be able to open or copy most files and to open some folders.
To remove this annoyance, it is possible to change owner of folders and files to your user.
<pre>
sudo chown -R username mount_folder
</pre>
</pre>
But it is not possible to apply this on the cryptmount folder directly. It is firstly needed to make a copy of the mount folder to a folder on the PC HDD.
<pre>
sudo cp -R /home/username/Desktop/mount_folder /home/username/mount_folder
sudo chown -R username /home/username/mount_folder
</pre>


{{Linux}}
{{Linux}}
<noinclude>[[Category:Main]]</noinclude>
<noinclude>[[Category:Main]]</noinclude>
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