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Reviewed f6baef2 (architecture, correctness, lifetimes, style, tests; failed: security). Suggestions
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When a systemd-tpm2 token failed to parse, find_tpm2_auto_data() only skipped it for EUCLEAN and returned any other error, thus stopping the unlock early even if the next token would be working. This could be the case where one token is for a machine with newer software. This affects the cryptsetup fallback path, systemd-cryptenroll, and the new unlocking of DDIs but the cryptsetup plugin skipped over every error except EUCLEAN (e.g., incomplete Argon2id parameters). All errors from tpm2_parse_luks2_json() except ENOMEM are about the token's own data and we should skip over them equally in all code paths. Skip over parsing errors for tokens in find_tpm2_auto_data() with a warning. Also remap the error to EPERM in the plugin as already done for JSON that can't be parsed at all. This unifies the behavior and gets tested now with two malformed tokens in front of a good one for the token plugin, the fallback path, systemd-cryptenroll, and systemd-dissect (the DDI case).
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| if (r == -ENOMEM) | ||
| return log_full_errno(log_level, r, "Failed to parse TPM2 JSON data: %m"); | ||
| if (r < 0) { | ||
| /* A token written by a newer version might use values we don't know, or it might be | ||
| * broken otherwise. Another token might still work. */ | ||
| log_full_errno(MAX(log_level, LOG_WARNING), r, "Failed to parse TPM2 JSON data of token %i, skipping: %m", token); |
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Claude: suggestion: No caller special-cases -EUCLEAN anymore, so the keyslot error remap to -EUCLEAN in tpm2_parse_luks2_json() (tpm2-util.c ~11994-12002) and its "callers can handle gracefully" comment are dead. They only make this warning print "Structure needs cleaning" instead of the real errno. Return keyslot directly.
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When a systemd-tpm2 token failed to parse, find_tpm2_auto_data() only skipped it for EUCLEAN and returned any other error, thus stopping the unlock early even if the next token would be working. This could be the case where one token is for a machine with newer software. This affects the cryptsetup fallback path, systemd-cryptenroll, and the new unlocking of DDIs but the crypsetup plugin skipped over every error except EUCLEAN (e.g., incomplete Argon2id parameters). All errors from tpm2_parse_luks2_json() except ENOMEM are about the token's own data and we should skip over them equally in all code paths. Skip over parsing errors for tokens in find_tpm2_auto_data(). Also remap the error to EPERM in the plugin as already done for JSON that can't be parsed at all. This unifies the behavior and gets tested now with two malformed tokens in front of a good one for the token plugin, the fallback path, systemd-cryptenroll, and systemd-dissect (the DDI case).