Skip to content

Commit

Permalink
audit: validate comparison operations, store them in sane form
Browse files Browse the repository at this point in the history 
Don't store the field->op in the messy (and very inconvenient for e.g.
audit_comparator()) form; translate to dense set of values and do full
validation of userland-submitted value while we are at it.

->audit_init_rule() and ->audit_match_rule() get new values now; in-tree
instances updated.

Signed-off-by: Al Viro <[email protected]>
  • Loading branch information
Al Viro committed Jan 4, 2009
1 parent 36c4f1b commit 5af75d8
Show file tree
Hide file tree
Showing 5 changed files with 94 additions and 84 deletions.
12 changes: 12 additions & 0 deletions include/linux/audit.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -247,6 +247,18 @@
#define AUDIT_GREATER_THAN_OR_EQUAL (AUDIT_GREATER_THAN|AUDIT_EQUAL)
#define AUDIT_OPERATORS (AUDIT_EQUAL|AUDIT_NOT_EQUAL|AUDIT_BIT_MASK)

enum {
Audit_equal,
Audit_not_equal,
Audit_bitmask,
Audit_bittest,
Audit_lt,
Audit_gt,
Audit_le,
Audit_ge,
Audit_bad
};

/* Status symbols */
/* Mask values */
#define AUDIT_STATUS_ENABLED 0x0001
Expand Down
2 changes: 1 addition & 1 deletion kernel/audit_tree.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -618,7 +618,7 @@ int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op)

if (pathname[0] != '/' ||
rule->listnr != AUDIT_FILTER_EXIT ||
op & ~AUDIT_EQUAL ||
op != Audit_equal ||
rule->inode_f || rule->watch || rule->tree)
return -EINVAL;
rule->tree = alloc_tree(pathname);
Expand Down
132 changes: 65 additions & 67 deletions kernel/auditfilter.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -252,7 +252,8 @@ static inline int audit_to_inode(struct audit_krule *krule,
struct audit_field *f)
{
if (krule->listnr != AUDIT_FILTER_EXIT ||
krule->watch || krule->inode_f || krule->tree)
krule->watch || krule->inode_f || krule->tree ||
(f->op != Audit_equal && f->op != Audit_not_equal))
return -EINVAL;

krule->inode_f = f;
Expand All @@ -270,7 +271,7 @@ static int audit_to_watch(struct audit_krule *krule, char *path, int len,

if (path[0] != '/' || path[len-1] == '/' ||
krule->listnr != AUDIT_FILTER_EXIT ||
op & ~AUDIT_EQUAL ||
op != Audit_equal ||
krule->inode_f || krule->watch || krule->tree)
return -EINVAL;

Expand Down Expand Up @@ -420,12 +421,32 @@ static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
return ERR_PTR(err);
}

static u32 audit_ops[] =
{
[Audit_equal] = AUDIT_EQUAL,
[Audit_not_equal] = AUDIT_NOT_EQUAL,
[Audit_bitmask] = AUDIT_BIT_MASK,
[Audit_bittest] = AUDIT_BIT_TEST,
[Audit_lt] = AUDIT_LESS_THAN,
[Audit_gt] = AUDIT_GREATER_THAN,
[Audit_le] = AUDIT_LESS_THAN_OR_EQUAL,
[Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL,
};

static u32 audit_to_op(u32 op)
{
u32 n;
for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++)
;
return n;
}


/* Translate struct audit_rule to kernel's rule respresentation.
* Exists for backward compatibility with userspace. */
static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
{
struct audit_entry *entry;
struct audit_field *ino_f;
int err = 0;
int i;

Expand All @@ -435,12 +456,28 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)

for (i = 0; i < rule->field_count; i++) {
struct audit_field *f = &entry->rule.fields[i];
u32 n;

n = rule->fields[i] & (AUDIT_NEGATE|AUDIT_OPERATORS);

/* Support for legacy operators where
* AUDIT_NEGATE bit signifies != and otherwise assumes == */
if (n & AUDIT_NEGATE)
f->op = Audit_not_equal;
else if (!n)
f->op = Audit_equal;
else
f->op = audit_to_op(n);

entry->rule.vers_ops = (n & AUDIT_OPERATORS) ? 2 : 1;

f->op = rule->fields[i] & (AUDIT_NEGATE|AUDIT_OPERATORS);
f->type = rule->fields[i] & ~(AUDIT_NEGATE|AUDIT_OPERATORS);
f->val = rule->values[i];

err = -EINVAL;
if (f->op == Audit_bad)
goto exit_free;

switch(f->type) {
default:
goto exit_free;
Expand All @@ -462,11 +499,8 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
case AUDIT_EXIT:
case AUDIT_SUCCESS:
/* bit ops are only useful on syscall args */
if (f->op == AUDIT_BIT_MASK ||
f->op == AUDIT_BIT_TEST) {
err = -EINVAL;
if (f->op == Audit_bitmask || f->op == Audit_bittest)
goto exit_free;
}
break;
case AUDIT_ARG0:
case AUDIT_ARG1:
Expand All @@ -475,11 +509,8 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
break;
/* arch is only allowed to be = or != */
case AUDIT_ARCH:
if ((f->op != AUDIT_NOT_EQUAL) && (f->op != AUDIT_EQUAL)
&& (f->op != AUDIT_NEGATE) && (f->op)) {
err = -EINVAL;
if (f->op != Audit_not_equal && f->op != Audit_equal)
goto exit_free;
}
entry->rule.arch_f = f;
break;
case AUDIT_PERM:
Expand All @@ -496,33 +527,10 @@ static struct audit_entry *audit_rule_to_entry(struct audit_rule *rule)
goto exit_free;
break;
}

entry->rule.vers_ops = (f->op & AUDIT_OPERATORS) ? 2 : 1;

/* Support for legacy operators where
* AUDIT_NEGATE bit signifies != and otherwise assumes == */
if (f->op & AUDIT_NEGATE)
f->op = AUDIT_NOT_EQUAL;
else if (!f->op)
f->op = AUDIT_EQUAL;
else if (f->op == AUDIT_OPERATORS) {
err = -EINVAL;
goto exit_free;
}
}

ino_f = entry->rule.inode_f;
if (ino_f) {
switch(ino_f->op) {
case AUDIT_NOT_EQUAL:
entry->rule.inode_f = NULL;
case AUDIT_EQUAL:
break;
default:
err = -EINVAL;
goto exit_free;
}
}
if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
entry->rule.inode_f = NULL;

exit_nofree:
return entry;
Expand All @@ -538,7 +546,6 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
{
int err = 0;
struct audit_entry *entry;
struct audit_field *ino_f;
void *bufp;
size_t remain = datasz - sizeof(struct audit_rule_data);
int i;
Expand All @@ -554,11 +561,11 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
struct audit_field *f = &entry->rule.fields[i];

err = -EINVAL;
if (!(data->fieldflags[i] & AUDIT_OPERATORS) ||
data->fieldflags[i] & ~AUDIT_OPERATORS)

f->op = audit_to_op(data->fieldflags[i]);
if (f->op == Audit_bad)
goto exit_free;

f->op = data->fieldflags[i] & AUDIT_OPERATORS;
f->type = data->fields[i];
f->val = data->values[i];
f->lsm_str = NULL;
Expand Down Expand Up @@ -670,18 +677,8 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
}
}

ino_f = entry->rule.inode_f;
if (ino_f) {
switch(ino_f->op) {
case AUDIT_NOT_EQUAL:
entry->rule.inode_f = NULL;
case AUDIT_EQUAL:
break;
default:
err = -EINVAL;
goto exit_free;
}
}
if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal)
entry->rule.inode_f = NULL;

exit_nofree:
return entry;
Expand Down Expand Up @@ -721,10 +718,10 @@ static struct audit_rule *audit_krule_to_rule(struct audit_krule *krule)
rule->fields[i] = krule->fields[i].type;

if (krule->vers_ops == 1) {
if (krule->fields[i].op & AUDIT_NOT_EQUAL)
if (krule->fields[i].op == Audit_not_equal)
rule->fields[i] |= AUDIT_NEGATE;
} else {
rule->fields[i] |= krule->fields[i].op;
rule->fields[i] |= audit_ops[krule->fields[i].op];
}
}
for (i = 0; i < AUDIT_BITMASK_SIZE; i++) rule->mask[i] = krule->mask[i];
Expand Down Expand Up @@ -752,7 +749,7 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
struct audit_field *f = &krule->fields[i];

data->fields[i] = f->type;
data->fieldflags[i] = f->op;
data->fieldflags[i] = audit_ops[f->op];
switch(f->type) {
case AUDIT_SUBJ_USER:
case AUDIT_SUBJ_ROLE:
Expand Down Expand Up @@ -1626,28 +1623,29 @@ int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
return err;
}

int audit_comparator(const u32 left, const u32 op, const u32 right)
int audit_comparator(u32 left, u32 op, u32 right)
{
switch (op) {
case AUDIT_EQUAL:
case Audit_equal:
return (left == right);
case AUDIT_NOT_EQUAL:
case Audit_not_equal:
return (left != right);
case AUDIT_LESS_THAN:
case Audit_lt:
return (left < right);
case AUDIT_LESS_THAN_OR_EQUAL:
case Audit_le:
return (left <= right);
case AUDIT_GREATER_THAN:
case Audit_gt:
return (left > right);
case AUDIT_GREATER_THAN_OR_EQUAL:
case Audit_ge:
return (left >= right);
case AUDIT_BIT_MASK:
case Audit_bitmask:
return (left & right);
case AUDIT_BIT_TEST:
case Audit_bittest:
return ((left & right) == right);
default:
BUG();
return 0;
}
BUG();
return 0;
}

/* Compare given dentry name with last component in given path,
Expand Down
26 changes: 13 additions & 13 deletions security/selinux/ss/services.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2602,7 +2602,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
case AUDIT_OBJ_ROLE:
case AUDIT_OBJ_TYPE:
/* only 'equals' and 'not equals' fit user, role, and type */
if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
if (op != Audit_equal && op != Audit_not_equal)
return -EINVAL;
break;
case AUDIT_SUBJ_SEN:
Expand Down Expand Up @@ -2736,32 +2736,32 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
case AUDIT_SUBJ_USER:
case AUDIT_OBJ_USER:
switch (op) {
case AUDIT_EQUAL:
case Audit_equal:
match = (ctxt->user == rule->au_ctxt.user);
break;
case AUDIT_NOT_EQUAL:
case Audit_not_equal:
match = (ctxt->user != rule->au_ctxt.user);
break;
}
break;
case AUDIT_SUBJ_ROLE:
case AUDIT_OBJ_ROLE:
switch (op) {
case AUDIT_EQUAL:
case Audit_equal:
match = (ctxt->role == rule->au_ctxt.role);
break;
case AUDIT_NOT_EQUAL:
case Audit_not_equal:
match = (ctxt->role != rule->au_ctxt.role);
break;
}
break;
case AUDIT_SUBJ_TYPE:
case AUDIT_OBJ_TYPE:
switch (op) {
case AUDIT_EQUAL:
case Audit_equal:
match = (ctxt->type == rule->au_ctxt.type);
break;
case AUDIT_NOT_EQUAL:
case Audit_not_equal:
match = (ctxt->type != rule->au_ctxt.type);
break;
}
Expand All @@ -2774,31 +2774,31 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule,
field == AUDIT_OBJ_LEV_LOW) ?
&ctxt->range.level[0] : &ctxt->range.level[1]);
switch (op) {
case AUDIT_EQUAL:
case Audit_equal:
match = mls_level_eq(&rule->au_ctxt.range.level[0],
level);
break;
case AUDIT_NOT_EQUAL:
case Audit_not_equal:
match = !mls_level_eq(&rule->au_ctxt.range.level[0],
level);
break;
case AUDIT_LESS_THAN:
case Audit_lt:
match = (mls_level_dom(&rule->au_ctxt.range.level[0],
level) &&
!mls_level_eq(&rule->au_ctxt.range.level[0],
level));
break;
case AUDIT_LESS_THAN_OR_EQUAL:
case Audit_le:
match = mls_level_dom(&rule->au_ctxt.range.level[0],
level);
break;
case AUDIT_GREATER_THAN:
case Audit_gt:
match = (mls_level_dom(level,
&rule->au_ctxt.range.level[0]) &&
!mls_level_eq(level,
&rule->au_ctxt.range.level[0]));
break;
case AUDIT_GREATER_THAN_OR_EQUAL:
case Audit_ge:
match = mls_level_dom(level,
&rule->au_ctxt.range.level[0]);
break;
Expand Down
6 changes: 3 additions & 3 deletions security/smack/smack_lsm.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2492,7 +2492,7 @@ static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
return -EINVAL;

if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
if (op != Audit_equal && op != Audit_not_equal)
return -EINVAL;

*rule = smk_import(rulestr, 0);
Expand Down Expand Up @@ -2556,9 +2556,9 @@ static int smack_audit_rule_match(u32 secid, u32 field, u32 op, void *vrule,
* both pointers will point to the same smack_known
* label.
*/
if (op == AUDIT_EQUAL)
if (op == Audit_equal)
return (rule == smack);
if (op == AUDIT_NOT_EQUAL)
if (op == Audit_not_equal)
return (rule != smack);

return 0;
Expand Down

0 comments on commit 5af75d8

Please sign in to comment.