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| author | Tyler Hicks <tyhicks@linux.microsoft.com> | 2020-08-11 14:26:21 -0500 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2020-08-31 17:45:14 -0400 |
| commit | 48ce1ddce16b0d1e3ff948da40a0d5125a4ee1a0 (patch) | |
| tree | ac61a13bfdde5936b29985c6a60ab75dc7ff3af7 /security/integrity | |
| parent | 176377d97d6a3fae971ecb1f47d9b9cb7dab05ef (diff) | |
| download | lwn-48ce1ddce16b0d1e3ff948da40a0d5125a4ee1a0.tar.gz lwn-48ce1ddce16b0d1e3ff948da40a0d5125a4ee1a0.zip | |
ima: Fail rule parsing when asymmetric key measurement isn't supportable
Measuring keys is currently only supported for asymmetric keys. In the
future, this might change.
For now, the "func=KEY_CHECK" and "keyrings=" options are only
appropriate when CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS is enabled. Make
this clear at policy load so that IMA policy authors don't assume that
these policy language constructs are supported.
Fixes: 2b60c0ecedf8 ("IMA: Read keyrings= option from the IMA policy")
Fixes: 5808611cccb2 ("IMA: Add KEY_CHECK func to measure keys")
Suggested-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security/integrity')
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index ea224f00b305..fe1df373c113 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -1233,7 +1233,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) entry->func = POLICY_CHECK; else if (strcmp(args[0].from, "KEXEC_CMDLINE") == 0) entry->func = KEXEC_CMDLINE; - else if (strcmp(args[0].from, "KEY_CHECK") == 0) + else if (IS_ENABLED(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) && + strcmp(args[0].from, "KEY_CHECK") == 0) entry->func = KEY_CHECK; else result = -EINVAL; @@ -1290,7 +1291,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) case Opt_keyrings: ima_log_string(ab, "keyrings", args[0].from); - if (entry->keyrings) { + if (!IS_ENABLED(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) || + entry->keyrings) { result = -EINVAL; break; } |