xref: /openssl/crypto/x509/pcy_node.c (revision da1c088f)
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 }
42 
ossl_policy_level_find_node(const X509_POLICY_LEVEL * level,const X509_POLICY_NODE * parent,const ASN1_OBJECT * id)43 X509_POLICY_NODE *ossl_policy_level_find_node(const X509_POLICY_LEVEL *level,
44                                               const X509_POLICY_NODE *parent,
45                                               const ASN1_OBJECT *id)
46 {
47     X509_POLICY_NODE *node;
48     int i;
49     for (i = 0; i < sk_X509_POLICY_NODE_num(level->nodes); i++) {
50         node = sk_X509_POLICY_NODE_value(level->nodes, i);
51         if (node->parent == parent) {
52             if (!OBJ_cmp(node->data->valid_policy, id))
53                 return node;
54         }
55     }
56     return NULL;
57 }
58 
ossl_policy_level_add_node(X509_POLICY_LEVEL * level,X509_POLICY_DATA * data,X509_POLICY_NODE * parent,X509_POLICY_TREE * tree,int extra_data)59 X509_POLICY_NODE *ossl_policy_level_add_node(X509_POLICY_LEVEL *level,
60                                              X509_POLICY_DATA *data,
61                                              X509_POLICY_NODE *parent,
62                                              X509_POLICY_TREE *tree,
63                                              int extra_data)
64 {
65     X509_POLICY_NODE *node;
66 
67     /* Verify that the tree isn't too large.  This mitigates CVE-2023-0464 */
68     if (tree->node_maximum > 0 && tree->node_count >= tree->node_maximum)
69         return NULL;
70 
71     node = OPENSSL_zalloc(sizeof(*node));
72     if (node == NULL)
73         return NULL;
74     node->data = data;
75     node->parent = parent;
76     if (level != NULL) {
77         if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
78             if (level->anyPolicy)
79                 goto node_error;
80             level->anyPolicy = node;
81         } else {
82 
83             if (level->nodes == NULL)
84                 level->nodes = ossl_policy_node_cmp_new();
85             if (level->nodes == NULL) {
86                 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
87                 goto node_error;
88             }
89             if (!sk_X509_POLICY_NODE_push(level->nodes, node)) {
90                 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
91                 goto node_error;
92             }
93         }
94     }
95 
96     if (extra_data) {
97         if (tree->extra_data == NULL)
98             tree->extra_data = sk_X509_POLICY_DATA_new_null();
99         if (tree->extra_data == NULL) {
100             ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
101             goto extra_data_error;
102         }
103         if (!sk_X509_POLICY_DATA_push(tree->extra_data, data)) {
104             ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
105             goto extra_data_error;
106         }
107     }
108 
109     tree->node_count++;
110     if (parent)
111         parent->nchild++;
112 
113     return node;
114 
115  extra_data_error:
116     if (level != NULL) {
117         if (level->anyPolicy == node)
118             level->anyPolicy = NULL;
119         else
120             (void) sk_X509_POLICY_NODE_pop(level->nodes);
121     }
122 
123  node_error:
124     ossl_policy_node_free(node);
125     return NULL;
126 }
127 
ossl_policy_node_free(X509_POLICY_NODE * node)128 void ossl_policy_node_free(X509_POLICY_NODE *node)
129 {
130     OPENSSL_free(node);
131 }
132 
133 /*
134  * See if a policy node matches a policy OID. If mapping enabled look through
135  * expected policy set otherwise just valid policy.
136  */
137 
ossl_policy_node_match(const X509_POLICY_LEVEL * lvl,const X509_POLICY_NODE * node,const ASN1_OBJECT * oid)138 int ossl_policy_node_match(const X509_POLICY_LEVEL *lvl,
139                            const X509_POLICY_NODE *node, const ASN1_OBJECT *oid)
140 {
141     int i;
142     ASN1_OBJECT *policy_oid;
143     const X509_POLICY_DATA *x = node->data;
144 
145     if ((lvl->flags & X509_V_FLAG_INHIBIT_MAP)
146         || !(x->flags & POLICY_DATA_FLAG_MAP_MASK)) {
147         if (!OBJ_cmp(x->valid_policy, oid))
148             return 1;
149         return 0;
150     }
151 
152     for (i = 0; i < sk_ASN1_OBJECT_num(x->expected_policy_set); i++) {
153         policy_oid = sk_ASN1_OBJECT_value(x->expected_policy_set, i);
154         if (!OBJ_cmp(policy_oid, oid))
155             return 1;
156     }
157     return 0;
158 
159 }
160