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| author | John Johansen <john.johansen@canonical.com> | 2018-05-03 00:39:58 -0700 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2018-05-14 19:21:11 -0700 |
| commit | cb740f574c7b81392680d275d442cb87ecddfb82 (patch) | |
| tree | 62ab55fbf9bedefeab62c0af51f71e376f741b09 /security | |
| parent | 4420a4d688632bf0cad6b76e6b482c0b4a38eb13 (diff) | |
| download | linux-next-cb740f574c7b81392680d275d442cb87ecddfb82.tar.gz | |
apparmor: modify audit rule support to support profile stacks
Allows for audit rules, where a rule could specify a profile stack
A//&B, while extending the current semantic so if the label specified
in the audit rule is a subset of the secid it is considered a match.
Eg. if the secid resolves to the label stack A//&B//&C
Then an audit rule specifying a label of
A - would match
B - would match
C - would match
D - would not
A//&B - would match as a subset
A//&C - would match as a subset
B//&C - would match as a subset
A//&B//&C - would match
A//&D - would not match, because while A does match, D is also
specified and does not
Note: audit rules are currently assumed to be coming from the root
namespace.
Signed-off-by: John Johansen <john.johansen@canonical.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/apparmor/audit.c | 27 |
1 files changed, 10 insertions, 17 deletions
diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 7ac7c8190cc4..575f3e9c8c80 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -165,7 +165,7 @@ int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa, } struct aa_audit_rule { - char *profile; + struct aa_label *label; }; void aa_audit_rule_free(void *vrule) @@ -173,7 +173,8 @@ void aa_audit_rule_free(void *vrule) struct aa_audit_rule *rule = vrule; if (rule) { - kfree(rule->profile); + if (!IS_ERR(rule->label)) + aa_put_label(rule->label); kfree(rule); } } @@ -196,13 +197,11 @@ int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule) if (!rule) return -ENOMEM; - rule->profile = kstrdup(rulestr, GFP_KERNEL); - - if (!rule->profile) { - kfree(rule); - return -ENOMEM; - } - + /* Currently rules are treated as coming from the root ns */ + rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr, + GFP_KERNEL, true, false); + if (IS_ERR(rule->label)) + return PTR_ERR(rule->label); *vrule = rule; return 0; @@ -229,8 +228,6 @@ int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, { struct aa_audit_rule *rule = vrule; struct aa_label *label; - struct label_it i; - struct aa_profile *profile; int found = 0; label = aa_secid_to_label(sid); @@ -238,12 +235,8 @@ int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, if (!label) return -ENOENT; - label_for_each(i, label, profile) { - if (strcmp(rule->profile, profile->base.hname) == 0) { - found = 1; - break; - } - } + if (aa_label_is_subset(label, rule->label)) + found = 1; switch (field) { case AUDIT_SUBJ_ROLE: |