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apparmor: fix absroot causing audited secids to begin with = 

AppArmor is prefixing secids that are converted to secctx with the =
to indicate the secctx should only be parsed from an absolute root
POV. This allows catching errors where secctx are reparsed back into
internal labels.

Unfortunately because audit is using secid to secctx conversion this
means that subject and object labels can result in a very unfortunate
== that can break audit parsing.

eg. the subj==unconfined term in the below audit message

type=USER_LOGIN msg=audit(1639443365.233:160): pid=1633 uid=0 auid=1000
ses=3 subj==unconfined msg='op=login id=1000 exe="/usr/sbin/sshd"
hostname=192.168.122.1 addr=192.168.122.1 terminal=/dev/pts/1 res=success'

Fix this by switch the prepending of = to a _. This still works as a
special character to flag this case without breaking audit. Also move
this check behind debug as it should not be needed during normal
operqation.

Fixes: 26b7899510 ("apparmor: add support for absolute root view based labels")
Reported-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2021-12-14 02:59:28 -08:00
parent f2906aa863
commit 511f7b5b83
2 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
security/apparmor/include/lib.h
View File

@ -22,6 +22,11 @@
*/
#define DEBUG_ON (aa_g_debug)
/*
* split individual debug cases out in preparation for finer grained
* debug controls in the future.
*/
#define AA_DEBUG_LABEL DEBUG_ON
#define dbg_printk(__fmt, __args...) pr_debug(__fmt, ##__args)
#define AA_DEBUG(fmt, args...) \
do { \

7
security/apparmor/label.c
View File

@ -1631,9 +1631,9 @@ int aa_label_snxprint(char *str, size_t size, struct aa_ns *ns,
AA_BUG(!str && size != 0);
AA_BUG(!label);
if (flags & FLAG_ABS_ROOT) {
if (AA_DEBUG_LABEL && (flags & FLAG_ABS_ROOT)) {
ns = root_ns;
len = snprintf(str, size, "=");
len = snprintf(str, size, "_");
update_for_len(total, len, size, str);
} else if (!ns) {
ns = labels_ns(label);
@ -1895,7 +1895,8 @@ struct aa_label *aa_label_strn_parse(struct aa_label *base, const char *str,
AA_BUG(!str);
str = skipn_spaces(str, n);
if (str == NULL || (*str == '=' && base != &root_ns->unconfined->label))
if (str == NULL || (AA_DEBUG_LABEL && *str == '_' &&
base != &root_ns->unconfined->label))
return ERR_PTR(-EINVAL);
len = label_count_strn_entries(str, end - str);