Added pytss python tutorials for quote and get_random

This commit is contained in:
Ian 2022-02-25 16:09:27 +02:00 committed by Dimitar Tomov
parent 3f47821d54
commit ca1501aad2
5 changed files with 101 additions and 8 deletions

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@ -14,4 +14,5 @@ Each example can be run just by typing `python3 example.py`
Each example has an accompanying description as markdown file, plus annotated code.
* [quote](quote.md)
* [randomnumber]
* [quote]

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@ -9,6 +9,10 @@ The code will:
* request a quote using the given attestation key, pcrs and extradata
* unmarshal the returned data structures and print these as a python dict and convert to JSON and pretty print
then as a bonus example
* generate a random number from the TPM and use that as the extra data to the quote
## Setup and Variables
The following code might need to be modified for you local setup
@ -28,6 +32,8 @@ Errors might be generated as the pytss libraries search for a suitable TPM devic
## Example Output
The following is example output:
```bash
~/tpm.dev.tutorials/PythonExamples$ python3 quote.py
ERROR:tcti:src/tss2-tcti/tcti-device.c:442:Tss2_Tcti_Device_Init() Failed to open specified TCTI device file /dev/tpmrm0: No such file or directory
@ -38,9 +44,9 @@ ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:222:tcti_control_command() Control command
ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:330:tcti_swtpm_set_locality() Failed to set locality: 0xa000a
WARNING:tcti:src/tss2-tcti/tcti-swtpm.c:599:Tss2_Tcti_Swtpm_Init() Could not set locality via control channel: 0xa000a
ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-swtpm.so.0
att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f5fb10419d0>
att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f0bebf19070>
ae= <class 'dict'>
{'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 308418200, 'resetCount': 22, 'restartCount': 0, 'safe': 1}, 'extraData': '49616e3132333435', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
{'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 313399693, 'resetCount': 24, 'restartCount': 0, 'safe': 1}, 'extraData': '49616e3132333435', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
{
"attested": {
@ -58,8 +64,8 @@ ae= <class 'dict'>
]
},
"clockInfo": {
"clock": 308418200,
"resetCount": 22,
"clock": 313399693,
"resetCount": 24,
"restartCount": 0,
"safe": 1
},
@ -73,4 +79,9 @@ ae= <class 'dict'>
"type": "attest_quote"
}
With randomly generated extra data: 0c830dd1a9dd50c0
ae2= <class 'dict'>
{'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 313399694, 'resetCount': 24, 'restartCount': 0, 'safe': 1}, 'extraData': '30633833306464316139646435306330', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
```
The *magic number* of the quote is returned as an integer `4283712327` this corresponds to the better known TPM returned byte sequence `FF544347` in hex.

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@ -77,3 +77,23 @@ print("ae=",type(ae),"\n",ae)
js = json.dumps(ae,indent=4)
print("\n",js)
#
# Now we'll do the same, except we'll generate the nonce using the TPM's random number generator
#
r = tpm.get_random( 8 )
extradata_to_use = TPM2B_DATA(str(r))
print("\nWith randomly generated extra data: ",str(r))
quote,signature = tpm.quote(
handle, pcrsels, extradata_to_use
)
att,_ = TPMS_ATTEST.unmarshal( bytes(quote) )
enc = json_encdec()
ae = enc.encode(att)
print("ae2=",type(ae),"\n",ae)

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@ -0,0 +1,30 @@
# Quote
This example demonstrates the use of ESAPI.get_random
The code will:
* setup the ESAPI interface
* send a TPM_STARTUP clear command
* request 8 random numbers from the TPM
* print out the result
## Setup and Variables
No specific setup is required. You may wish to change the number of bytes returned in the `get_random` call.
## Running
To run type `python3 quote.py`
Errors might be generated as the pytss libraries search for a suitable TPM device. If everything is successful then a random number will be shown.
## Output
```bash
~/tpm.dev.tutorials/PythonExamples$ python3 randomnumber.py
type is <class 'tpm2_pytss.types.TPM2B_DIGEST'>
r is a10ab7558675a56c
as int 11604288967829464428
```

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@ -0,0 +1,31 @@
#
# Import the tpm2_pytss libraries
#
from tpm2_pytss import *
#
# Make a connection to a TPM and use the ESAPI interface
# tcti=None means that the pytss libraries will search for an available TCTI
#
#
# When this is run, then as the various TCTI interfaces are searched errors are written if those interfaces are not foud
#
tpm = ESAPI(tcti=None)
#
# Send a startup message, just in case (actually this is because I'm using the IBM SW TPM and haven't started it properly)
#
tpm.startup(TPM2_SU.CLEAR)
#
# Now to make the quote and return the attested values and signature
#
r = tpm.get_random( 8 )
print("type is ",type(r))
print("r is ",str(r))
print("as int ",int(str(r),16))