tss2_verifyquote(1)

🌸 NAME 🌸

okay so bestie, this is tss2_verifyquote(1) from the General Commands Manual — the original NAME line is basically just that plus a tiny hyphen, so consider it folded in with love. It's the command we're about to make iconic. 💅

✨ SYNOPSIS ✨

tss2_verifyquote [OPTIONS]

🦋 SEE ALSO 🦋

• fapi-config(5) — use this to adjust Fapi parameters like the used cryptographic profile and TCTI or directories for the Fapi metadata storages. Lowkey the setup page.
• fapi-profile(5) — use this to determine the cryptographic algorithms and parameters for all keys and operations of a specific TPM interaction like the name hash algorithm, the asymmetric signature algorithm, scheme and parameters and PCR bank selection. The algorithm vibe-check page.

💖 DESCRIPTION 💖

tss2_verifyquote(1) verifies that the data returned by a quote is valid. Yes, it's giving "trust but verify," and it includes:

• Reconstructing the quoteInfo’s PCR values from the eventLog (if an eventLog was provided) 🧚
• Verifying the quoteInfo using the signature and the publicKeyPath 🔥

The used signature verification scheme is specified in the cryptographic profile (cf., fapi-profile(5)). That's the algorithm receipt, bestie.

heads up: an application using tss2_verifyquote() will further have to do its own trust homework: - Assess the publicKey’s trustworthiness - Assess the eventLog entries’ trustworthiness

🎀 OPTIONS 🎀

These are the available options:

• -Q, --qualifyingData=FILENAME or - (for stdin): A nonce provided by the caller to ensure freshness of the signature. Optional parameter.
• -l, --pcrLog=FILENAME or - (for stdin): Returns the PCR event log for the chosen PCR. Optional parameter.

PCR event logs are a list (arbitrary length JSON array) of log entries with the following content.

• recnum: Unique record number
• pcr: PCR index
• digest: The digests
• type: The type of event. At the moment the only possible value is: "LINUX_IMA" (legacy IMA)
• eventDigest: Digest of the event; e.g. the digest of the measured file
• eventName: Name of the event; e.g. the name of the measured file.

• -q, --quoteInfo=FILENAME or - (for stdin): The JSON-encoded structure holding the inputs to the quote operation. This includes the digest value and PCR values.
• -k, --publicKeyPath=STRING: Identifies the signing key. MAY be a path to the public key hierarchy /ext.
• -i, --signature=FILENAME or - (for stdin): The signature over the quoted material.

🌈 COMMON OPTIONS 🌈

This collection of options are common to all tss2 programs and provide information that many users may expect.

• -h, --help [man|no-man]: Display the tool's manpage. By default, it attempts to invoke the manpager for the tool, however, on failure will output a short tool summary. This is the same behavior if the man option argument is specified, however if explicit man is requested, the tool will provide errors from man on stderr. If the no-man option is specified, or the manpager fails, the short options will be output to stdout.

To successfully use the manpages feature requires the manpages to be installed or on MANPATH, See man(1) for more details.

• -v, --version: Display version information for this tool, supported tctis and exit.

👑 EXAMPLE 👑

tss2_verifyquote --publicKeyPath="ext/myNewParent" --qualifyingData=qualifyingData.file --quoteInfo=quoteInfo.file --signature=signature.file --pcrLog=pcrLog.file

⭐ RETURNS ⭐

0 on success or 1 on failure. That's the whole exit-status story, no cap.

💀 BUGS 💀

Github Issues

🫶 HELP 🫶

See the Mailing List

📜 License 📜

This work is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).

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xoxo, your tss2_verifyquote(1) bestie — page brought to you by tpm2-tools, dated APRIL 2019 💅✨