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ima: add support for new "euid" policy condition

Browse source 
The new "euid" policy condition measures files with the specified
effective uid (euid).  In addition, for CAP_SETUID files it measures
files with the specified uid or suid.

Changelog:
- fixed checkpatch.pl warnings
- fixed avc denied {setuid} messages - based on Roberto's feedback

Signed-off-by: Mimi Zohar <[email protected]>
Signed-off-by: Dr. Greg Wettstein <[email protected]>
Cc: [email protected]
This commit is contained in:
Mimi Zohar 2014-11-05 07:48:36 -05:00
commit 139069eff7
2 changed files with 25 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

27
security/integrity/ima/ima_policy.c
View file

@ -27,6 +27,7 @@
#define IMA_UID 0x0008
#define IMA_FOWNER 0x0010
#define IMA_FSUUID 0x0020
#define IMA_EUID 0x0080
#define UNKNOWN 0
#define MEASURE 0x0001 /* same as IMA_MEASURE */
@ -194,6 +195,16 @@ static bool ima_match_rules(struct ima_rule_entry *rule,
return false;
if ((rule->flags & IMA_UID) && !uid_eq(rule->uid, cred->uid))
return false;
if (rule->flags & IMA_EUID) {
if (has_capability_noaudit(current, CAP_SETUID)) {
if (!uid_eq(rule->uid, cred->euid)
&& !uid_eq(rule->uid, cred->suid)
&& !uid_eq(rule->uid, cred->uid))
return false;
} else if (!uid_eq(rule->uid, cred->euid))
return false;
}
if ((rule->flags & IMA_FOWNER) && !uid_eq(rule->fowner, inode->i_uid))
return false;
for (i = 0; i < MAX_LSM_RULES; i++) {
@ -373,7 +384,8 @@ enum {
Opt_audit,
Opt_obj_user, Opt_obj_role, Opt_obj_type,
Opt_subj_user, Opt_subj_role, Opt_subj_type,
Opt_func, Opt_mask, Opt_fsmagic, Opt_uid, Opt_fowner,
Opt_func, Opt_mask, Opt_fsmagic,
Opt_uid, Opt_euid, Opt_fowner,
Opt_appraise_type, Opt_fsuuid, Opt_permit_directio
};
@ -394,6 +406,7 @@ static match_table_t policy_tokens = {
{Opt_fsmagic, "fsmagic=%s"},
{Opt_fsuuid, "fsuuid=%s"},
{Opt_uid, "uid=%s"},
{Opt_euid, "euid=%s"},
{Opt_fowner, "fowner=%s"},
{Opt_appraise_type, "appraise_type=%s"},
{Opt_permit_directio, "permit_directio"},
@ -566,6 +579,9 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
break;
case Opt_uid:
ima_log_string(ab, "uid", args[0].from);
case Opt_euid:
if (token == Opt_euid)
ima_log_string(ab, "euid", args[0].from);
if (uid_valid(entry->uid)) {
result = -EINVAL;
@ -574,11 +590,14 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
result = kstrtoul(args[0].from, 10, &lnum);
if (!result) {
entry->uid = make_kuid(current_user_ns(), (uid_t)lnum);
if (!uid_valid(entry->uid) || (((uid_t)lnum) != lnum))
entry->uid = make_kuid(current_user_ns(),
(uid_t) lnum);
if (!uid_valid(entry->uid) ||
(uid_t)lnum != lnum)
result = -EINVAL;
else
entry->flags |= IMA_UID;
entry->flags |= (token == Opt_uid)
? IMA_UID : IMA_EUID;
}
break;
case Opt_fowner: