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authorEric Paris <eparis@redhat.com>2013-04-16 17:26:51 -0400
committerEric Paris <eparis@redhat.com>2013-04-30 15:31:28 -0400
commitab61d38ed8cf670946d12dc46b9198b521c790ea (patch)
tree742d96692c63be9f9811fcf624f65811f8f6e96c /kernel/auditfilter.c
parent62062cf8a3a99a933efdac549da380f230dbe982 (diff)
audit: make validity checking generic
We have 2 interfaces to send audit rules. Rather than check validity of things in 2 places make a helper function. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel/auditfilter.c')
-rw-r--r--kernel/auditfilter.c146
1 files changed, 70 insertions, 76 deletions
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 9e666004e0d..ff6e09d8927 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -310,7 +310,7 @@ static u32 audit_to_op(u32 op)
return n;
}
-/* check if a field is valid for a given list */
+/* check if an audit field is valid */
static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
{
switch(f->type) {
@@ -320,6 +320,69 @@ static int audit_field_valid(struct audit_entry *entry, struct audit_field *f)
return -EINVAL;
break;
};
+
+ switch(f->type) {
+ default:
+ return -EINVAL;
+ case AUDIT_UID:
+ case AUDIT_EUID:
+ case AUDIT_SUID:
+ case AUDIT_FSUID:
+ case AUDIT_LOGINUID:
+ case AUDIT_OBJ_UID:
+ case AUDIT_GID:
+ case AUDIT_EGID:
+ case AUDIT_SGID:
+ case AUDIT_FSGID:
+ case AUDIT_OBJ_GID:
+ case AUDIT_PID:
+ case AUDIT_PERS:
+ case AUDIT_MSGTYPE:
+ case AUDIT_PPID:
+ case AUDIT_DEVMAJOR:
+ case AUDIT_DEVMINOR:
+ case AUDIT_EXIT:
+ case AUDIT_SUCCESS:
+ /* bit ops are only useful on syscall args */
+ if (f->op == Audit_bitmask || f->op == Audit_bittest)
+ return -EINVAL;
+ break;
+ case AUDIT_ARG0:
+ case AUDIT_ARG1:
+ case AUDIT_ARG2:
+ case AUDIT_ARG3:
+ case AUDIT_SUBJ_USER:
+ case AUDIT_SUBJ_ROLE:
+ case AUDIT_SUBJ_TYPE:
+ case AUDIT_SUBJ_SEN:
+ case AUDIT_SUBJ_CLR:
+ case AUDIT_OBJ_USER:
+ case AUDIT_OBJ_ROLE:
+ case AUDIT_OBJ_TYPE:
+ case AUDIT_OBJ_LEV_LOW:
+ case AUDIT_OBJ_LEV_HIGH:
+ case AUDIT_WATCH:
+ case AUDIT_DIR:
+ case AUDIT_FILTERKEY:
+ break;
+ /* arch is only allowed to be = or != */
+ case AUDIT_ARCH:
+ if (f->op != Audit_not_equal && f->op != Audit_equal)
+ return -EINVAL;
+ break;
+ case AUDIT_PERM:
+ if (f->val & ~15)
+ return -EINVAL;
+ break;
+ case AUDIT_FILETYPE:
+ if (f->val & ~S_IFMT)
+ return -EINVAL;
+ break;
+ case AUDIT_FIELD_COMPARE:
+ if (f->val > AUDIT_MAX_FIELD_COMPARE)
+ return -EINVAL;
+ break;
+ };
return 0;
}
@@ -361,18 +424,17 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
if (f->op == Audit_bad)
goto exit_free;
- switch(f->type) {
- default:
+ err = audit_field_valid(entry, f);
+ if (err)
goto exit_free;
+
+ err = -EINVAL;
+ switch (f->type) {
case AUDIT_UID:
case AUDIT_EUID:
case AUDIT_SUID:
case AUDIT_FSUID:
case AUDIT_LOGINUID:
- /* bit ops not implemented for uid comparisons */
- if (f->op == Audit_bitmask || f->op == Audit_bittest)
- goto exit_free;
-
f->uid = make_kuid(current_user_ns(), f->val);
if (!uid_valid(f->uid))
goto exit_free;
@@ -381,45 +443,13 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
case AUDIT_EGID:
case AUDIT_SGID:
case AUDIT_FSGID:
- /* bit ops not implemented for gid comparisons */
- if (f->op == Audit_bitmask || f->op == Audit_bittest)
- goto exit_free;
-
f->gid = make_kgid(current_user_ns(), f->val);
if (!gid_valid(f->gid))
goto exit_free;
break;
- case AUDIT_PID:
- case AUDIT_PERS:
- case AUDIT_MSGTYPE:
- case AUDIT_PPID:
- case AUDIT_DEVMAJOR:
- case AUDIT_DEVMINOR:
- case AUDIT_EXIT:
- case AUDIT_SUCCESS:
- /* bit ops are only useful on syscall args */
- if (f->op == Audit_bitmask || f->op == Audit_bittest)
- goto exit_free;
- break;
- case AUDIT_ARG0:
- case AUDIT_ARG1:
- case AUDIT_ARG2:
- case AUDIT_ARG3:
- break;
- /* arch is only allowed to be = or != */
case AUDIT_ARCH:
- if (f->op != Audit_not_equal && f->op != Audit_equal)
- goto exit_free;
entry->rule.arch_f = f;
break;
- case AUDIT_PERM:
- if (f->val & ~15)
- goto exit_free;
- break;
- case AUDIT_FILETYPE:
- if (f->val & ~S_IFMT)
- goto exit_free;
- break;
case AUDIT_INODE:
err = audit_to_inode(&entry->rule, f);
if (err)
@@ -477,18 +507,13 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
goto exit_free;
err = -EINVAL;
-
- switch(f->type) {
+ switch (f->type) {
case AUDIT_UID:
case AUDIT_EUID:
case AUDIT_SUID:
case AUDIT_FSUID:
case AUDIT_LOGINUID:
case AUDIT_OBJ_UID:
- /* bit ops not implemented for uid comparisons */
- if (f->op == Audit_bitmask || f->op == Audit_bittest)
- goto exit_free;
-
f->uid = make_kuid(current_user_ns(), f->val);
if (!uid_valid(f->uid))
goto exit_free;
@@ -498,27 +523,10 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
case AUDIT_SGID:
case AUDIT_FSGID:
case AUDIT_OBJ_GID:
- /* bit ops not implemented for gid comparisons */
- if (f->op == Audit_bitmask || f->op == Audit_bittest)
- goto exit_free;
-
f->gid = make_kgid(current_user_ns(), f->val);
if (!gid_valid(f->gid))
goto exit_free;
break;
- case AUDIT_PID:
- case AUDIT_PERS:
- case AUDIT_MSGTYPE:
- case AUDIT_PPID:
- case AUDIT_DEVMAJOR:
- case AUDIT_DEVMINOR:
- case AUDIT_EXIT:
- case AUDIT_SUCCESS:
- case AUDIT_ARG0:
- case AUDIT_ARG1:
- case AUDIT_ARG2:
- case AUDIT_ARG3:
- break;
case AUDIT_ARCH:
entry->rule.arch_f = f;
break;
@@ -589,20 +597,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
entry->rule.buflen += f->val;
entry->rule.filterkey = str;
break;
- case AUDIT_PERM:
- if (f->val & ~15)
- goto exit_free;
- break;
- case AUDIT_FILETYPE:
- if (f->val & ~S_IFMT)
- goto exit_free;
- break;
- case AUDIT_FIELD_COMPARE:
- if (f->val > AUDIT_MAX_FIELD_COMPARE)
- goto exit_free;
- break;
- default:
- goto exit_free;
}
}