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authorRoberto Sassu <roberto.sassu@huawei.com>2021-06-03 15:17:05 +0200
committerMimi Zohar <zohar@linux.ibm.com>2021-06-03 10:02:37 -0400
commit88016de3ab075790e1f1bf047576e9b557c22d19 (patch)
treea524078fa7c6266bc65081f4882217f996b7bc70 /security
parent8314b6732ae4e600bb933e108f96ce0176acb09c (diff)
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ima: Define new template evm-sig
With the recent introduction of the evmsig template field, remote verifiers can obtain the EVM portable signature instead of the IMA signature, to verify file metadata. After introducing the new fields to include file metadata in the measurement list, this patch finally defines the evm-sig template, whose format is: d-ng|n-ng|evmsig|xattrnames|xattrlengths|xattrvalues|iuid|igid|imode xattrnames, xattrlengths and xattrvalues are populated only from defined EVM protected xattrs, i.e. the ones that EVM considers to verify the portable signature. xattrnames and xattrlengths are populated only if the xattr is present. xattrnames and xattrlengths are not necessary for verifying the EVM portable signature, but they are included for completeness of information, if a remote verifier wants to infer more from file metadata. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security')
-rw-r--r--security/integrity/ima/ima_template.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 159a31d2fcdf..a85963853a91 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -22,6 +22,8 @@ static struct ima_template_desc builtin_templates[] = {
{.name = "ima-sig", .fmt = "d-ng|n-ng|sig"},
{.name = "ima-buf", .fmt = "d-ng|n-ng|buf"},
{.name = "ima-modsig", .fmt = "d-ng|n-ng|sig|d-modsig|modsig"},
+ {.name = "evm-sig",
+ .fmt = "d-ng|n-ng|evmsig|xattrnames|xattrlengths|xattrvalues|iuid|igid|imode"},
{.name = "", .fmt = ""}, /* placeholder for a custom format */
};
@@ -69,7 +71,8 @@ static const struct ima_template_field supported_fields[] = {
* need to be accounted for since they shouldn't be defined in the same template
* description as 'd-ng' and 'n-ng' respectively.
*/
-#define MAX_TEMPLATE_NAME_LEN sizeof("d-ng|n-ng|sig|buf|d-modisg|modsig")
+#define MAX_TEMPLATE_NAME_LEN \
+ sizeof("d-ng|n-ng|evmsig|xattrnames|xattrlengths|xattrvalues|iuid|igid|imode")
static struct ima_template_desc *ima_template;
static struct ima_template_desc *ima_buf_template;