mirror of
https://github.com/tpm2dev/tpm.dev.tutorials.git
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Merge pull request #26 from iolivergithub/master
Added quote and get_random to PythonTutorials
This commit is contained in:
Dimitar Tomov
GitHub
commit
ae4c64fcff
6 changed files with 107 additions and 9 deletions
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@ -14,4 +14,5 @@ Each example can be run just by typing `python3 example.py`
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Each example has an accompanying description as markdown file, plus annotated code.
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* [randomnumber](randomnumber.md)
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* [quote](quote.md)
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@ -9,6 +9,10 @@ The code will:
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* request a quote using the given attestation key, pcrs and extradata
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* unmarshal the returned data structures and print these as a python dict and convert to JSON and pretty print
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then as a bonus example
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* generate a random number from the TPM and use that as the extra data to the quote
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## Setup and Variables
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The following code might need to be modified for you local setup
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@ -28,6 +32,8 @@ Errors might be generated as the pytss libraries search for a suitable TPM devic
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## Example Output
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The following is example output:
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```bash
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~/tpm.dev.tutorials/PythonExamples$ python3 quote.py
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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
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@ -38,9 +44,9 @@ ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:222:tcti_control_command() Control command
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ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:330:tcti_swtpm_set_locality() Failed to set locality: 0xa000a
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WARNING:tcti:src/tss2-tcti/tcti-swtpm.c:599:Tss2_Tcti_Swtpm_Init() Could not set locality via control channel: 0xa000a
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ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-swtpm.so.0
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att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f5fb10419d0>
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att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f0bebf19070>
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ae= <class 'dict'>
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{'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'}
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{'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'}
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{
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"attested": {
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@ -58,8 +64,8 @@ ae= <class 'dict'>
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]
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},
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"clockInfo": {
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"clock": 308418200,
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"resetCount": 22,
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"clock": 313399693,
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"resetCount": 24,
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"restartCount": 0,
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"safe": 1
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},
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@ -73,4 +79,9 @@ ae= <class 'dict'>
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"type": "attest_quote"
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}
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```
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With randomly generated extra data: 0c830dd1a9dd50c0
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ae2= <class 'dict'>
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{'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'}
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```
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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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@ -67,7 +67,7 @@ print("att=",att)
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# We construct an encoder and encode that structure in a python dict
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#
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enc = json_encdec()
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enc = json_encdec()
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ae = enc.encode(att)
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print("ae=",type(ae),"\n",ae)
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@ -76,4 +76,24 @@ print("ae=",type(ae),"\n",ae)
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#
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js = json.dumps(ae,indent=4)
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print("\n",js)
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print("\n",js)
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#
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# Now we'll do the same, except we'll generate the nonce using the TPM's random number generator
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#
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r = tpm.get_random( 8 )
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extradata_to_use = TPM2B_DATA(str(r))
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print("\nWith randomly generated extra data: ",str(r))
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quote,signature = tpm.quote(
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handle, pcrsels, extradata_to_use
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)
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att,_ = TPMS_ATTEST.unmarshal( bytes(quote) )
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enc = json_encdec()
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ae = enc.encode(att)
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print("ae2=",type(ae),"\n",ae)
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30
PythonExamples/randomnumber.md
Normal file
30
PythonExamples/randomnumber.md
Normal file
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@ -0,0 +1,30 @@
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# Get random
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This example demonstrates the use of ESAPI.get_random
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The code will:
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* setup the ESAPI interface
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* send a TPM_STARTUP clear command
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* request 8 random numbers from the TPM
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* print out the result
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## Setup and Variables
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No specific setup is required. You may wish to change the number of bytes returned in the `get_random` call.
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## Running
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To run type `python3 quote.py`
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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.
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## Output
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```bash
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~/tpm.dev.tutorials/PythonExamples$ python3 randomnumber.py
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type is <class 'tpm2_pytss.types.TPM2B_DIGEST'>
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r is a10ab7558675a56c
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as int 11604288967829464428
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```
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31
PythonExamples/randomnumber.py
Normal file
31
PythonExamples/randomnumber.py
Normal file
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@ -0,0 +1,31 @@
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#
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# Import the tpm2_pytss libraries
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#
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from tpm2_pytss import *
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#
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# Make a connection to a TPM and use the ESAPI interface
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# tcti=None means that the pytss libraries will search for an available TCTI
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#
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#
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# When this is run, then as the various TCTI interfaces are searched errors are written if those interfaces are not foud
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#
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tpm = ESAPI(tcti=None)
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#
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# Send a startup message, just in case (actually this is because I'm using the IBM SW TPM and haven't started it properly)
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#
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tpm.startup(TPM2_SU.CLEAR)
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#
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# Now to make the quote and return the attested values and signature
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#
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r = tpm.get_random( 8 )
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print("type is ",type(r))
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print("r is ",str(r))
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print("as int ",int(str(r),16))
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@ -16,16 +16,19 @@ Why GitHub?
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* [Introduction to TPM Concepts](Intro/README.md)
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* [Random Number Generator](Random_Number_Generator/README.md)
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* [Python examples](PythonExamples/README.md)
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### Advanced Use Cases
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### Advanced usage
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* [Boot with TPM: Secure vs Measured vs Trusted](Boot-with-TPM/README.md)
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* [Attestation, MakeCredential, ActivateCredential](Attestation/README.md)
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* [Enrollment, Enrollment protocols](Enrollment/README.md)
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* [Tboot and TXT installation](TXT/start.md)
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* [TPM2 Commands explained](TPM-Commands/)
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## Upcomming tutorials
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* Localities
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* Remote Attestation protocols
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* Quick setup for TPM.dev courses
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## Contributors
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@ -38,6 +41,8 @@ Why GitHub?
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* Ken Goldman
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* Trammell Hudson
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* Jason Heiss
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* Tobias Schultz
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* Gabriel Kerneis
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## Licensing
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