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ima: Introduce template field evmsig and write to field sig as fallback

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With the patch to accept EVM portable signatures when the
appraise_type=imasig requirement is specified in the policy, appraisal can
be successfully done even if the file does not have an IMA signature.

However, remote attestation would not see that a different signature type
was used, as only IMA signatures can be included in the measurement list.
This patch solves the issue by introducing the new template field 'evmsig'
to show EVM portable signatures and by including its value in the existing
field 'sig' if the IMA signature is not found.

Suggested-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Roberto Sassu
2021-05-14 17:27:52 +02:00
committed by Mimi Zohar
parent 7aa5783d95
commit 026d7fc92a
4 changed files with 39 additions and 2 deletions
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2
security/integrity/ima/ima_template_lib.h
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@@ -46,4 +46,6 @@ int ima_eventbuf_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
int ima_eventmodsig_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
int ima_eventevmsig_init(struct ima_event_data *event_data,
struct ima_field_data *field_data);
#endif /* __LINUX_IMA_TEMPLATE_LIB_H */