Hi Michael,

On 21/09/2021 11:50, Michael Tremer wrote:
> Hello,
>
>> On 18 Sep 2021, at 17:15, Peter Müller <peter.mueller(a)ipfire.org> wrote:
>>
>> Hello Michael,
>> hello *,
>>
>> just a small comment for the records: As discussed in the last monthly telephone
>> conference (https://wiki.ipfire.org/devel/telco/2021-09-06), we will use a TPM only
>> for HWRNG purposes. Nothing else will depend on it, as there is nothing relevant
>> left to be locked down in IPFire thanks to enforced kernel module signing.
> Does anyone have any hardware at grabs to verify that this works?
>
> rngd —-list should list the TPM device as a potential source.

On my running system I got the following response to the command:-

Entropy sources that are available but disabled
1: TPM RNG Device (tpm)
4: NIST Network Entropy Beacon (nist)
Available and enabled entropy sources:
2: Intel RDRAND Instruction RNG (rdrand)
Available entropy sources that failed initalization:
0: Hardware RNG Device (hwrng)


and on my VM testbed system I got the same message:-

Entropy sources that are available but disabled
1: TPM RNG Device (tpm)
4: NIST Network Entropy Beacon (nist)
Available and enabled entropy sources:
2: Intel RDRAND Instruction RNG (rdrand)
Available entropy sources that failed initalization:
0: Hardware RNG Device (hwrng)

I suspect that available but disabled means that I would need to turn it on in the bios. Is that a correct assumption?

To test it I presume that I need to copy the changes into the kernel config for the architecture I am using and also need to reboot.

Once I have the changers in place how do I tell if it is working?

Regards,

Adolf.

>> So no user needs to worry about introducing TPM support coming with a lack of
>> digital sovereignty - that is, if something like this even exits on today's hardware. :-)
>>
>> Acked-by: Peter Müller <peter.mueller(a)ipfire.org>
>>
>> Thanks, and best regards,
>> Peter Müller
>>
>>
>>> Signed-off-by: Michael Tremer <michael.tremer(a)ipfire.org>
>>> ---
>>>   config/kernel/kernel.config.aarch64-ipfire | 15 ++++++++++++++-
>>>   config/kernel/kernel.config.armv6l-ipfire  | 12 +++++++++++-
>>>   config/kernel/kernel.config.i586-ipfire    | 16 +++++++++++++++-
>>>   config/kernel/kernel.config.x86_64-ipfire  | 17 ++++++++++++++++-
>>>   4 files changed, 56 insertions(+), 4 deletions(-)
>>> diff --git a/config/kernel/kernel.config.aarch64-ipfire b/config/kernel/kernel.config.aarch64-ipfire
>>> index aa34b64db..49ee85970 100644
>>> --- a/config/kernel/kernel.config.aarch64-ipfire
>>> +++ b/config/kernel/kernel.config.aarch64-ipfire
>>> @@ -3422,7 +3422,19 @@ CONFIG_DEVMEM=y
>>>   CONFIG_RAW_DRIVER=y
>>>   CONFIG_MAX_RAW_DEVS=8192
>>>   CONFIG_DEVPORT=y
>>> -# CONFIG_TCG_TPM is not set
>>> +CONFIG_TCG_TPM=m
>>> +CONFIG_HW_RANDOM_TPM=y
>>> +CONFIG_TCG_TIS_CORE=m
>>> +CONFIG_TCG_TIS=m
>>> +CONFIG_TCG_TIS_I2C_ATMEL=m
>>> +CONFIG_TCG_TIS_I2C_INFINEON=m
>>> +CONFIG_TCG_TIS_I2C_NUVOTON=m
>>> +CONFIG_TCG_ATMEL=m
>>> +CONFIG_TCG_INFINEON=m
>>> +CONFIG_TCG_CRB=m
>>> +CONFIG_TCG_VTPM_PROXY=m
>>> +CONFIG_TCG_TIS_ST33ZP24=m
>>> +CONFIG_TCG_TIS_ST33ZP24_I2C=m
>>>   # CONFIG_XILLYBUS is not set
>>>   # end of Character devices
>>>   @@ -7271,6 +7283,7 @@ CONFIG_IO_WQ=y
>>>   CONFIG_KEYS=y
>>>   # CONFIG_KEYS_REQUEST_CACHE is not set
>>>   # CONFIG_PERSISTENT_KEYRINGS is not set
>>> +# CONFIG_TRUSTED_KEYS is not set
>>>   # CONFIG_ENCRYPTED_KEYS is not set
>>>   # CONFIG_KEY_DH_OPERATIONS is not set
>>>   CONFIG_SECURITY_DMESG_RESTRICT=y
>>> diff --git a/config/kernel/kernel.config.armv6l-ipfire b/config/kernel/kernel.config.armv6l-ipfire
>>> index 7b82e87df..b11a179e3 100644
>>> --- a/config/kernel/kernel.config.armv6l-ipfire
>>> +++ b/config/kernel/kernel.config.armv6l-ipfire
>>> @@ -3463,7 +3463,16 @@ CONFIG_DEVMEM=y
>>>   CONFIG_RAW_DRIVER=y
>>>   CONFIG_MAX_RAW_DEVS=8192
>>>   CONFIG_DEVPORT=y
>>> -# CONFIG_TCG_TPM is not set
>>> +CONFIG_TCG_TPM=m
>>> +CONFIG_HW_RANDOM_TPM=y
>>> +CONFIG_TCG_TIS_CORE=m
>>> +CONFIG_TCG_TIS=m
>>> +CONFIG_TCG_TIS_I2C_ATMEL=m
>>> +CONFIG_TCG_TIS_I2C_INFINEON=m
>>> +CONFIG_TCG_TIS_I2C_NUVOTON=m
>>> +CONFIG_TCG_VTPM_PROXY=m
>>> +CONFIG_TCG_TIS_ST33ZP24=m
>>> +CONFIG_TCG_TIS_ST33ZP24_I2C=m
>>>   # CONFIG_XILLYBUS is not set
>>>   # end of Character devices
>>>   @@ -7366,6 +7375,7 @@ CONFIG_IO_WQ=y
>>>   CONFIG_KEYS=y
>>>   # CONFIG_KEYS_REQUEST_CACHE is not set
>>>   # CONFIG_PERSISTENT_KEYRINGS is not set
>>> +# CONFIG_TRUSTED_KEYS is not set
>>>   # CONFIG_ENCRYPTED_KEYS is not set
>>>   # CONFIG_KEY_DH_OPERATIONS is not set
>>>   CONFIG_SECURITY_DMESG_RESTRICT=y
>>> diff --git a/config/kernel/kernel.config.i586-ipfire b/config/kernel/kernel.config.i586-ipfire
>>> index 90d4ac856..2d7158c96 100644
>>> --- a/config/kernel/kernel.config.i586-ipfire
>>> +++ b/config/kernel/kernel.config.i586-ipfire
>>> @@ -3449,7 +3449,21 @@ CONFIG_DEVPORT=y
>>>   CONFIG_HPET=y
>>>   # CONFIG_HPET_MMAP is not set
>>>   CONFIG_HANGCHECK_TIMER=m
>>> -# CONFIG_TCG_TPM is not set
>>> +CONFIG_TCG_TPM=m
>>> +CONFIG_HW_RANDOM_TPM=y
>>> +CONFIG_TCG_TIS_CORE=m
>>> +CONFIG_TCG_TIS=m
>>> +CONFIG_TCG_TIS_I2C_ATMEL=m
>>> +CONFIG_TCG_TIS_I2C_INFINEON=m
>>> +CONFIG_TCG_TIS_I2C_NUVOTON=m
>>> +CONFIG_TCG_NSC=m
>>> +CONFIG_TCG_ATMEL=m
>>> +CONFIG_TCG_INFINEON=m
>>> +CONFIG_TCG_XEN=m
>>> +CONFIG_TCG_CRB=m
>>> +CONFIG_TCG_VTPM_PROXY=m
>>> +CONFIG_TCG_TIS_ST33ZP24=m
>>> +CONFIG_TCG_TIS_ST33ZP24_I2C=m
>>>   # CONFIG_TELCLOCK is not set
>>>   # CONFIG_XILLYBUS is not set
>>>   # end of Character devices
>>> diff --git a/config/kernel/kernel.config.x86_64-ipfire b/config/kernel/kernel.config.x86_64-ipfire
>>> index fe93d731c..65014f41a 100644
>>> --- a/config/kernel/kernel.config.x86_64-ipfire
>>> +++ b/config/kernel/kernel.config.x86_64-ipfire
>>> @@ -3413,7 +3413,21 @@ CONFIG_DEVPORT=y
>>>   CONFIG_HPET=y
>>>   # CONFIG_HPET_MMAP is not set
>>>   CONFIG_HANGCHECK_TIMER=m
>>> -# CONFIG_TCG_TPM is not set
>>> +CONFIG_TCG_TPM=m
>>> +CONFIG_HW_RANDOM_TPM=y
>>> +CONFIG_TCG_TIS_CORE=m
>>> +CONFIG_TCG_TIS=m
>>> +CONFIG_TCG_TIS_I2C_ATMEL=m
>>> +CONFIG_TCG_TIS_I2C_INFINEON=m
>>> +CONFIG_TCG_TIS_I2C_NUVOTON=m
>>> +CONFIG_TCG_NSC=m
>>> +CONFIG_TCG_ATMEL=m
>>> +CONFIG_TCG_INFINEON=m
>>> +CONFIG_TCG_XEN=m
>>> +CONFIG_TCG_CRB=m
>>> +CONFIG_TCG_VTPM_PROXY=m
>>> +CONFIG_TCG_TIS_ST33ZP24=m
>>> +CONFIG_TCG_TIS_ST33ZP24_I2C=m
>>>   # CONFIG_TELCLOCK is not set
>>>   # CONFIG_XILLYBUS is not set
>>>   # end of Character devices
>>> @@ -6746,6 +6760,7 @@ CONFIG_IO_WQ=y
>>>   CONFIG_KEYS=y
>>>   # CONFIG_KEYS_REQUEST_CACHE is not set
>>>   # CONFIG_PERSISTENT_KEYRINGS is not set
>>> +# CONFIG_TRUSTED_KEYS is not set
>>>   # CONFIG_ENCRYPTED_KEYS is not set
>>>   # CONFIG_KEY_DH_OPERATIONS is not set
>>>   CONFIG_SECURITY_DMESG_RESTRICT=y