1 /*
2 * Copyright 2004-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <openssl/asn1.h>
11 #include <openssl/x509.h>
12 #include <openssl/x509v3.h>
13 #include <openssl/err.h>
14
15 #include "pcy_local.h"
16
node_cmp(const X509_POLICY_NODE * const * a,const X509_POLICY_NODE * const * b)17 static int node_cmp(const X509_POLICY_NODE *const *a,
18 const X509_POLICY_NODE *const *b)
19 {
20 return OBJ_cmp((*a)->data->valid_policy, (*b)->data->valid_policy);
21 }
22
STACK_OF(X509_POLICY_NODE)23 STACK_OF(X509_POLICY_NODE) *ossl_policy_node_cmp_new(void)
24 {
25 return sk_X509_POLICY_NODE_new(node_cmp);
26 }
27
ossl_policy_tree_find_sk(STACK_OF (X509_POLICY_NODE)* nodes,const ASN1_OBJECT * id)28 X509_POLICY_NODE *ossl_policy_tree_find_sk(STACK_OF(X509_POLICY_NODE) *nodes,
29 const ASN1_OBJECT *id)
30 {
31 X509_POLICY_DATA n;
32 X509_POLICY_NODE l;
33 int idx;
34
35 n.valid_policy = (ASN1_OBJECT *)id;
36 l.data = &n;
37
38 idx = sk_X509_POLICY_NODE_find(nodes, &l);
39 return sk_X509_POLICY_NODE_value(nodes, idx);
40 }
41
ossl_policy_level_find_node(const X509_POLICY_LEVEL * level,const X509_POLICY_NODE * parent,const ASN1_OBJECT * id)42 X509_POLICY_NODE *ossl_policy_level_find_node(const X509_POLICY_LEVEL *level,
43 const X509_POLICY_NODE *parent,
44 const ASN1_OBJECT *id)
45 {
46 X509_POLICY_NODE *node;
47 int i;
48 for (i = 0; i < sk_X509_POLICY_NODE_num(level->nodes); i++) {
49 node = sk_X509_POLICY_NODE_value(level->nodes, i);
50 if (node->parent == parent) {
51 if (!OBJ_cmp(node->data->valid_policy, id))
52 return node;
53 }
54 }
55 return NULL;
56 }
57
ossl_policy_level_add_node(X509_POLICY_LEVEL * level,X509_POLICY_DATA * data,X509_POLICY_NODE * parent,X509_POLICY_TREE * tree,int extra_data)58 X509_POLICY_NODE *ossl_policy_level_add_node(X509_POLICY_LEVEL *level,
59 X509_POLICY_DATA *data,
60 X509_POLICY_NODE *parent,
61 X509_POLICY_TREE *tree,
62 int extra_data)
63 {
64 X509_POLICY_NODE *node;
65
66 /* Verify that the tree isn't too large. This mitigates CVE-2023-0464 */
67 if (tree->node_maximum > 0 && tree->node_count >= tree->node_maximum)
68 return NULL;
69
70 node = OPENSSL_zalloc(sizeof(*node));
71 if (node == NULL)
72 return NULL;
73 node->data = data;
74 node->parent = parent;
75 if (level != NULL) {
76 if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
77 if (level->anyPolicy)
78 goto node_error;
79 level->anyPolicy = node;
80 } else {
81
82 if (level->nodes == NULL)
83 level->nodes = ossl_policy_node_cmp_new();
84 if (level->nodes == NULL) {
85 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
86 goto node_error;
87 }
88 if (!sk_X509_POLICY_NODE_push(level->nodes, node)) {
89 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
90 goto node_error;
91 }
92 }
93 }
94
95 if (extra_data) {
96 if (tree->extra_data == NULL)
97 tree->extra_data = sk_X509_POLICY_DATA_new_null();
98 if (tree->extra_data == NULL) {
99 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
100 goto extra_data_error;
101 }
102 if (!sk_X509_POLICY_DATA_push(tree->extra_data, data)) {
103 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
104 goto extra_data_error;
105 }
106 }
107
108 tree->node_count++;
109 if (parent)
110 parent->nchild++;
111
112 return node;
113
114 extra_data_error:
115 if (level != NULL) {
116 if (level->anyPolicy == node)
117 level->anyPolicy = NULL;
118 else
119 (void)sk_X509_POLICY_NODE_pop(level->nodes);
120 }
121
122 node_error:
123 ossl_policy_node_free(node);
124 return NULL;
125 }
126
ossl_policy_node_free(X509_POLICY_NODE * node)127 void ossl_policy_node_free(X509_POLICY_NODE *node)
128 {
129 OPENSSL_free(node);
130 }
131
132 /*
133 * See if a policy node matches a policy OID. If mapping enabled look through
134 * expected policy set otherwise just valid policy.
135 */
136
ossl_policy_node_match(const X509_POLICY_LEVEL * lvl,const X509_POLICY_NODE * node,const ASN1_OBJECT * oid)137 int ossl_policy_node_match(const X509_POLICY_LEVEL *lvl,
138 const X509_POLICY_NODE *node, const ASN1_OBJECT *oid)
139 {
140 int i;
141 ASN1_OBJECT *policy_oid;
142 const X509_POLICY_DATA *x = node->data;
143
144 if ((lvl->flags & X509_V_FLAG_INHIBIT_MAP)
145 || !(x->flags & POLICY_DATA_FLAG_MAP_MASK)) {
146 if (!OBJ_cmp(x->valid_policy, oid))
147 return 1;
148 return 0;
149 }
150
151 for (i = 0; i < sk_ASN1_OBJECT_num(x->expected_policy_set); i++) {
152 policy_oid = sk_ASN1_OBJECT_value(x->expected_policy_set, i);
153 if (!OBJ_cmp(policy_oid, oid))
154 return 1;
155 }
156 return 0;
157 }
158