[331] | 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* X509 v3 extension utilities */
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include "internal/cryptlib.h"
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| 14 | #include <openssl/conf.h>
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| 15 | #include <openssl/x509v3.h>
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| 16 |
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| 17 | #include "ext_dat.h"
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| 18 |
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| 19 | static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
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| 20 |
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| 21 | static int ext_cmp(const X509V3_EXT_METHOD *const *a,
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| 22 | const X509V3_EXT_METHOD *const *b);
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| 23 | static void ext_list_free(X509V3_EXT_METHOD *ext);
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| 24 |
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| 25 | int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
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| 26 | {
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| 27 | if (ext_list == NULL
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| 28 | && (ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp)) == NULL) {
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| 29 | X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
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| 30 | return 0;
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| 31 | }
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| 32 | if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
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| 33 | X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
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| 34 | return 0;
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| 35 | }
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| 36 | return 1;
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| 37 | }
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| 38 |
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| 39 | static int ext_cmp(const X509V3_EXT_METHOD *const *a,
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| 40 | const X509V3_EXT_METHOD *const *b)
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| 41 | {
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| 42 | return ((*a)->ext_nid - (*b)->ext_nid);
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| 43 | }
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| 44 |
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| 45 | DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
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| 46 | const X509V3_EXT_METHOD *, ext);
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| 47 | IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
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| 48 | const X509V3_EXT_METHOD *, ext);
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| 49 |
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| 50 | /*
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| 51 | * This table will be searched using OBJ_bsearch so it *must* kept in order
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| 52 | * of the ext_nid values.
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| 53 | */
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| 54 |
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| 55 | static const X509V3_EXT_METHOD *standard_exts[] = {
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| 56 | &v3_nscert,
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| 57 | &v3_ns_ia5_list[0],
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| 58 | &v3_ns_ia5_list[1],
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| 59 | &v3_ns_ia5_list[2],
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| 60 | &v3_ns_ia5_list[3],
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| 61 | &v3_ns_ia5_list[4],
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| 62 | &v3_ns_ia5_list[5],
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| 63 | &v3_ns_ia5_list[6],
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| 64 | &v3_skey_id,
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| 65 | &v3_key_usage,
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| 66 | &v3_pkey_usage_period,
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| 67 | &v3_alt[0],
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| 68 | &v3_alt[1],
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| 69 | &v3_bcons,
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| 70 | &v3_crl_num,
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| 71 | &v3_cpols,
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| 72 | &v3_akey_id,
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| 73 | &v3_crld,
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| 74 | &v3_ext_ku,
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| 75 | &v3_delta_crl,
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| 76 | &v3_crl_reason,
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| 77 | #ifndef OPENSSL_NO_OCSP
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| 78 | &v3_crl_invdate,
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| 79 | #endif
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| 80 | &v3_sxnet,
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| 81 | &v3_info,
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| 82 | #ifndef OPENSSL_NO_RFC3779
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| 83 | &v3_addr,
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| 84 | &v3_asid,
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| 85 | #endif
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| 86 | #ifndef OPENSSL_NO_OCSP
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| 87 | &v3_ocsp_nonce,
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| 88 | &v3_ocsp_crlid,
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| 89 | &v3_ocsp_accresp,
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| 90 | &v3_ocsp_nocheck,
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| 91 | &v3_ocsp_acutoff,
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| 92 | &v3_ocsp_serviceloc,
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| 93 | #endif
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| 94 | &v3_sinfo,
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| 95 | &v3_policy_constraints,
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| 96 | #ifndef OPENSSL_NO_OCSP
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| 97 | &v3_crl_hold,
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| 98 | #endif
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| 99 | &v3_pci,
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| 100 | &v3_name_constraints,
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| 101 | &v3_policy_mappings,
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| 102 | &v3_inhibit_anyp,
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| 103 | &v3_idp,
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| 104 | &v3_alt[2],
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| 105 | &v3_freshest_crl,
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| 106 | #ifndef OPENSSL_NO_CT
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| 107 | &v3_ct_scts[0],
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| 108 | &v3_ct_scts[1],
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| 109 | &v3_ct_scts[2],
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| 110 | #endif
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| 111 | &v3_tls_feature,
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| 112 | };
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| 113 |
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| 114 | /* Number of standard extensions */
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| 115 |
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| 116 | #define STANDARD_EXTENSION_COUNT OSSL_NELEM(standard_exts)
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| 117 |
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| 118 | const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
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| 119 | {
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| 120 | X509V3_EXT_METHOD tmp;
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| 121 | const X509V3_EXT_METHOD *t = &tmp, *const *ret;
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| 122 | int idx;
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| 123 | if (nid < 0)
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| 124 | return NULL;
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| 125 | tmp.ext_nid = nid;
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| 126 | ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
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| 127 | if (ret)
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| 128 | return *ret;
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| 129 | if (!ext_list)
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| 130 | return NULL;
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| 131 | idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
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| 132 | if (idx == -1)
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| 133 | return NULL;
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| 134 | return sk_X509V3_EXT_METHOD_value(ext_list, idx);
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| 135 | }
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| 136 |
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| 137 | const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
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| 138 | {
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| 139 | int nid;
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| 140 | if ((nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext))) == NID_undef)
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| 141 | return NULL;
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| 142 | return X509V3_EXT_get_nid(nid);
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| 143 | }
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| 144 |
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| 145 | int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
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| 146 | {
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| 147 | for (; extlist->ext_nid != -1; extlist++)
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| 148 | if (!X509V3_EXT_add(extlist))
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| 149 | return 0;
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| 150 | return 1;
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| 151 | }
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| 152 |
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| 153 | int X509V3_EXT_add_alias(int nid_to, int nid_from)
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| 154 | {
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| 155 | const X509V3_EXT_METHOD *ext;
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| 156 | X509V3_EXT_METHOD *tmpext;
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| 157 |
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| 158 | if ((ext = X509V3_EXT_get_nid(nid_from)) == NULL) {
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| 159 | X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, X509V3_R_EXTENSION_NOT_FOUND);
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| 160 | return 0;
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| 161 | }
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| 162 | if ((tmpext = OPENSSL_malloc(sizeof(*tmpext))) == NULL) {
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| 163 | X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE);
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| 164 | return 0;
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| 165 | }
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| 166 | *tmpext = *ext;
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| 167 | tmpext->ext_nid = nid_to;
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| 168 | tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
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| 169 | return X509V3_EXT_add(tmpext);
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| 170 | }
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| 171 |
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| 172 | void X509V3_EXT_cleanup(void)
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| 173 | {
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| 174 | sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
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| 175 | ext_list = NULL;
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| 176 | }
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| 177 |
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| 178 | static void ext_list_free(X509V3_EXT_METHOD *ext)
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| 179 | {
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| 180 | if (ext->ext_flags & X509V3_EXT_DYNAMIC)
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| 181 | OPENSSL_free(ext);
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| 182 | }
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| 183 |
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| 184 | /*
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| 185 | * Legacy function: we don't need to add standard extensions any more because
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| 186 | * they are now kept in ext_dat.h.
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| 187 | */
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| 188 |
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| 189 | int X509V3_add_standard_extensions(void)
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| 190 | {
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| 191 | return 1;
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| 192 | }
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| 193 |
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| 194 | /* Return an extension internal structure */
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| 195 |
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| 196 | void *X509V3_EXT_d2i(X509_EXTENSION *ext)
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| 197 | {
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| 198 | const X509V3_EXT_METHOD *method;
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| 199 | const unsigned char *p;
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| 200 | ASN1_STRING *extvalue;
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| 201 | int extlen;
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| 202 |
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| 203 | if ((method = X509V3_EXT_get(ext)) == NULL)
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| 204 | return NULL;
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| 205 | extvalue = X509_EXTENSION_get_data(ext);
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| 206 | p = ASN1_STRING_get0_data(extvalue);
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| 207 | extlen = ASN1_STRING_length(extvalue);
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| 208 | if (method->it)
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| 209 | return ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
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| 210 | return method->d2i(NULL, &p, extlen);
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| 211 | }
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| 212 |
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| 213 | /*-
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| 214 | * Get critical flag and decoded version of extension from a NID.
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| 215 | * The "idx" variable returns the last found extension and can
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| 216 | * be used to retrieve multiple extensions of the same NID.
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| 217 | * However multiple extensions with the same NID is usually
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| 218 | * due to a badly encoded certificate so if idx is NULL we
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| 219 | * choke if multiple extensions exist.
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| 220 | * The "crit" variable is set to the critical value.
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| 221 | * The return value is the decoded extension or NULL on
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| 222 | * error. The actual error can have several different causes,
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| 223 | * the value of *crit reflects the cause:
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| 224 | * >= 0, extension found but not decoded (reflects critical value).
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| 225 | * -1 extension not found.
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| 226 | * -2 extension occurs more than once.
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| 227 | */
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| 228 |
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| 229 | void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
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| 230 | int *idx)
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| 231 | {
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| 232 | int lastpos, i;
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| 233 | X509_EXTENSION *ex, *found_ex = NULL;
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| 234 | if (!x) {
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| 235 | if (idx)
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| 236 | *idx = -1;
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| 237 | if (crit)
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| 238 | *crit = -1;
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| 239 | return NULL;
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| 240 | }
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| 241 | if (idx)
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| 242 | lastpos = *idx + 1;
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| 243 | else
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| 244 | lastpos = 0;
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| 245 | if (lastpos < 0)
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| 246 | lastpos = 0;
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| 247 | for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
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| 248 | ex = sk_X509_EXTENSION_value(x, i);
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| 249 | if (OBJ_obj2nid(X509_EXTENSION_get_object(ex)) == nid) {
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| 250 | if (idx) {
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| 251 | *idx = i;
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| 252 | found_ex = ex;
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| 253 | break;
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| 254 | } else if (found_ex) {
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| 255 | /* Found more than one */
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| 256 | if (crit)
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| 257 | *crit = -2;
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| 258 | return NULL;
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| 259 | }
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| 260 | found_ex = ex;
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| 261 | }
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| 262 | }
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| 263 | if (found_ex) {
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| 264 | /* Found it */
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| 265 | if (crit)
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| 266 | *crit = X509_EXTENSION_get_critical(found_ex);
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| 267 | return X509V3_EXT_d2i(found_ex);
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| 268 | }
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| 269 |
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| 270 | /* Extension not found */
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| 271 | if (idx)
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| 272 | *idx = -1;
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| 273 | if (crit)
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| 274 | *crit = -1;
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| 275 | return NULL;
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| 276 | }
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| 277 |
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| 278 | /*
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| 279 | * This function is a general extension append, replace and delete utility.
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| 280 | * The precise operation is governed by the 'flags' value. The 'crit' and
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| 281 | * 'value' arguments (if relevant) are the extensions internal structure.
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| 282 | */
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| 283 |
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| 284 | int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
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| 285 | int crit, unsigned long flags)
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| 286 | {
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| 287 | int extidx = -1;
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| 288 | int errcode;
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| 289 | X509_EXTENSION *ext, *extmp;
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| 290 | unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
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| 291 |
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| 292 | /*
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| 293 | * If appending we don't care if it exists, otherwise look for existing
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| 294 | * extension.
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| 295 | */
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| 296 | if (ext_op != X509V3_ADD_APPEND)
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| 297 | extidx = X509v3_get_ext_by_NID(*x, nid, -1);
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| 298 |
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| 299 | /* See if extension exists */
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| 300 | if (extidx >= 0) {
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| 301 | /* If keep existing, nothing to do */
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| 302 | if (ext_op == X509V3_ADD_KEEP_EXISTING)
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| 303 | return 1;
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| 304 | /* If default then its an error */
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| 305 | if (ext_op == X509V3_ADD_DEFAULT) {
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| 306 | errcode = X509V3_R_EXTENSION_EXISTS;
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| 307 | goto err;
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| 308 | }
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| 309 | /* If delete, just delete it */
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| 310 | if (ext_op == X509V3_ADD_DELETE) {
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| 311 | if (!sk_X509_EXTENSION_delete(*x, extidx))
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| 312 | return -1;
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| 313 | return 1;
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| 314 | }
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| 315 | } else {
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| 316 | /*
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| 317 | * If replace existing or delete, error since extension must exist
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| 318 | */
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| 319 | if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
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| 320 | (ext_op == X509V3_ADD_DELETE)) {
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| 321 | errcode = X509V3_R_EXTENSION_NOT_FOUND;
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| 322 | goto err;
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| 323 | }
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| 324 | }
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| 325 |
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| 326 | /*
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| 327 | * If we get this far then we have to create an extension: could have
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| 328 | * some flags for alternative encoding schemes...
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| 329 | */
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| 330 |
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| 331 | ext = X509V3_EXT_i2d(nid, crit, value);
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| 332 |
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| 333 | if (!ext) {
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| 334 | X509V3err(X509V3_F_X509V3_ADD1_I2D,
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| 335 | X509V3_R_ERROR_CREATING_EXTENSION);
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| 336 | return 0;
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| 337 | }
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| 338 |
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| 339 | /* If extension exists replace it.. */
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| 340 | if (extidx >= 0) {
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| 341 | extmp = sk_X509_EXTENSION_value(*x, extidx);
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| 342 | X509_EXTENSION_free(extmp);
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| 343 | if (!sk_X509_EXTENSION_set(*x, extidx, ext))
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| 344 | return -1;
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| 345 | return 1;
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| 346 | }
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| 347 |
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| 348 | if (*x == NULL
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| 349 | && (*x = sk_X509_EXTENSION_new_null()) == NULL)
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| 350 | return -1;
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| 351 | if (!sk_X509_EXTENSION_push(*x, ext))
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| 352 | return -1;
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| 353 |
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| 354 | return 1;
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| 355 |
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| 356 | err:
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| 357 | if (!(flags & X509V3_ADD_SILENT))
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| 358 | X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
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| 359 | return 0;
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| 360 | }
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