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ima: add audit log support for larger hashes 

Different files might be signed based on different hash algorithms.
This patch prefixes the audit log measurement hash with the hash
algorithm.

Changelog:
- use generic HASH_ALGO defintions
- use ':' as delimiter between the hash algorithm and the digest
  (Roberto Sassu)
- always include the hash algorithm used when audit-logging a measurement

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Peter Moody <pmoody@google.com>
This commit is contained in:
Mimi Zohar 2013-06-07 12:16:38 +02:00
parent a71dc65d30
commit 5278aa52f3
1 changed files with 4 additions and 1 deletions
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5
security/integrity/ima/ima_api.c
View File

@ -270,6 +270,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
{ {
struct audit_buffer *ab; struct audit_buffer *ab;
char hash[(iint->ima_hash->length * 2) + 1]; char hash[(iint->ima_hash->length * 2) + 1];
const char *algo_name = hash_algo_name[iint->ima_hash->algo];
char algo_hash[sizeof(hash) + strlen(algo_name) + 2];
int i; int i;
if (iint->flags & IMA_AUDITED) if (iint->flags & IMA_AUDITED)
@ -287,7 +289,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
audit_log_format(ab, "file="); audit_log_format(ab, "file=");
audit_log_untrustedstring(ab, filename); audit_log_untrustedstring(ab, filename);
audit_log_format(ab, " hash="); audit_log_format(ab, " hash=");
audit_log_untrustedstring(ab, hash); snprintf(algo_hash, sizeof(algo_hash), "%s:%s", algo_name, hash);
audit_log_untrustedstring(ab, algo_hash);
audit_log_task_info(ab, current); audit_log_task_info(ab, current);
audit_log_end(ab); audit_log_end(ab);