Hello, I gave this a go on an IPFire Business Appliance: [root(a)fw01 ~]# rngd -x 2 -x 0 -n 1 --test Note, reference of entropy sources by index is deprecated, use entropy source short name instead Disabling 2: Intel RDRAND Instruction RNG (rdrand) Note, reference of entropy sources by index is deprecated, use entropy source short name instead Disabling 0: Hardware RNG Device (hwrng) Note, reference of entropy sources by index is deprecated, use entropy source short name instead Enabling 1: TPM RNG Device (tpm) Initializing available sources [tpm ]: The TPM entropy source only supports TPM1.2 hardware and is deprecated. TPM2.0 and later hardware exports entropy via /dev/hwrng, which can be collected via the hwrng entropy source in rngd [tpm ]: Initialization Failed can't open any entropy sourceMaybe RNG device modules are not loaded So if the kernel is exporting this correctly, the default configuration of rngd will use the TPM: [root(a)fw01 ~]# rngd --list 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) This one is running the production kernel, but as soon as the kernel makes /dev/hwrng available, we should be fine. Best, -Michael > On 21 Sep 2021, at 13:31, Adolf Belka wrote: > > Hi Michael, > > After a bit more searching around I don't think I have TPM capability on my systems. > > Regards, > > Adolf. > > On 21/09/2021 13:40, Adolf Belka wrote: >> Hi Michael, >> >> On 21/09/2021 11:50, Michael Tremer wrote: >>> Hello, >>> >>>> On 18 Sep 2021, at 17:15, Peter Müller 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 >>>> >>>> Thanks, and best regards, >>>> Peter Müller >>>> >>>> >>>>> Signed-off-by: Michael Tremer >>>>> --- >>>>> 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