1 /* 2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (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 <stdio.h> 11 #include "internal/cryptlib.h" 12 #include <openssl/evp.h> 13 #include <openssl/asn1t.h> 14 #include <openssl/x509.h> 15 #include <openssl/x509v3.h> 16 #include "internal/x509_int.h" 17 18 ASN1_SEQUENCE_enc(X509_CINF, enc, 0) = { 19 ASN1_EXP_OPT(X509_CINF, version, ASN1_INTEGER, 0), 20 ASN1_EMBED(X509_CINF, serialNumber, ASN1_INTEGER), 21 ASN1_EMBED(X509_CINF, signature, X509_ALGOR), 22 ASN1_SIMPLE(X509_CINF, issuer, X509_NAME), 23 ASN1_EMBED(X509_CINF, validity, X509_VAL), 24 ASN1_SIMPLE(X509_CINF, subject, X509_NAME), 25 ASN1_SIMPLE(X509_CINF, key, X509_PUBKEY), 26 ASN1_IMP_OPT(X509_CINF, issuerUID, ASN1_BIT_STRING, 1), 27 ASN1_IMP_OPT(X509_CINF, subjectUID, ASN1_BIT_STRING, 2), 28 ASN1_EXP_SEQUENCE_OF_OPT(X509_CINF, extensions, X509_EXTENSION, 3) 29 } ASN1_SEQUENCE_END_enc(X509_CINF, X509_CINF) 30 31 IMPLEMENT_ASN1_FUNCTIONS(X509_CINF) 32 /* X509 top level structure needs a bit of customisation */ 33 34 extern void policy_cache_free(X509_POLICY_CACHE *cache); 35 36 static int x509_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 37 void *exarg) 38 { 39 X509 *ret = (X509 *)*pval; 40 41 switch (operation) { 42 43 case ASN1_OP_NEW_POST: 44 ret->ex_flags = 0; 45 ret->ex_pathlen = -1; 46 ret->ex_pcpathlen = -1; 47 ret->skid = NULL; 48 ret->akid = NULL; 49 #ifndef OPENSSL_NO_RFC3779 50 ret->rfc3779_addr = NULL; 51 ret->rfc3779_asid = NULL; 52 #endif 53 ret->aux = NULL; 54 ret->crldp = NULL; 55 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data)) 56 return 0; 57 break; 58 59 case ASN1_OP_FREE_POST: 60 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509, ret, &ret->ex_data); 61 X509_CERT_AUX_free(ret->aux); 62 ASN1_OCTET_STRING_free(ret->skid); 63 AUTHORITY_KEYID_free(ret->akid); 64 CRL_DIST_POINTS_free(ret->crldp); 65 policy_cache_free(ret->policy_cache); 66 GENERAL_NAMES_free(ret->altname); 67 NAME_CONSTRAINTS_free(ret->nc); 68 #ifndef OPENSSL_NO_RFC3779 69 sk_IPAddressFamily_pop_free(ret->rfc3779_addr, IPAddressFamily_free); 70 ASIdentifiers_free(ret->rfc3779_asid); 71 #endif 72 break; 73 74 } 75 76 return 1; 77 78 } 79 80 ASN1_SEQUENCE_ref(X509, x509_cb) = { 81 ASN1_EMBED(X509, cert_info, X509_CINF), 82 ASN1_EMBED(X509, sig_alg, X509_ALGOR), 83 ASN1_EMBED(X509, signature, ASN1_BIT_STRING) 84 } ASN1_SEQUENCE_END_ref(X509, X509) 85 86 IMPLEMENT_ASN1_FUNCTIONS(X509) 87 88 IMPLEMENT_ASN1_DUP_FUNCTION(X509) 89 90 int X509_set_ex_data(X509 *r, int idx, void *arg) 91 { 92 return CRYPTO_set_ex_data(&r->ex_data, idx, arg); 93 } 94 95 void *X509_get_ex_data(X509 *r, int idx) 96 { 97 return CRYPTO_get_ex_data(&r->ex_data, idx); 98 } 99 100 /* 101 * X509_AUX ASN1 routines. X509_AUX is the name given to a certificate with 102 * extra info tagged on the end. Since these functions set how a certificate 103 * is trusted they should only be used when the certificate comes from a 104 * reliable source such as local storage. 105 */ 106 107 X509 *d2i_X509_AUX(X509 **a, const unsigned char **pp, long length) 108 { 109 const unsigned char *q; 110 X509 *ret; 111 int freeret = 0; 112 113 /* Save start position */ 114 q = *pp; 115 116 if (a == NULL || *a == NULL) 117 freeret = 1; 118 ret = d2i_X509(a, &q, length); 119 /* If certificate unreadable then forget it */ 120 if (ret == NULL) 121 return NULL; 122 /* update length */ 123 length -= q - *pp; 124 if (length > 0 && !d2i_X509_CERT_AUX(&ret->aux, &q, length)) 125 goto err; 126 *pp = q; 127 return ret; 128 err: 129 if (freeret) { 130 X509_free(ret); 131 if (a) 132 *a = NULL; 133 } 134 return NULL; 135 } 136 137 /* 138 * Serialize trusted certificate to *pp or just return the required buffer 139 * length if pp == NULL. We ultimately want to avoid modifying *pp in the 140 * error path, but that depends on similar hygiene in lower-level functions. 141 * Here we avoid compounding the problem. 142 */ 143 static int i2d_x509_aux_internal(X509 *a, unsigned char **pp) 144 { 145 int length, tmplen; 146 unsigned char *start = pp != NULL ? *pp : NULL; 147 148 /* 149 * This might perturb *pp on error, but fixing that belongs in i2d_X509() 150 * not here. It should be that if a == NULL length is zero, but we check 151 * both just in case. 152 */ 153 length = i2d_X509(a, pp); 154 if (length <= 0 || a == NULL) 155 return length; 156 157 tmplen = i2d_X509_CERT_AUX(a->aux, pp); 158 if (tmplen < 0) { 159 if (start != NULL) 160 *pp = start; 161 return tmplen; 162 } 163 length += tmplen; 164 165 return length; 166 } 167 168 /* 169 * Serialize trusted certificate to *pp, or just return the required buffer 170 * length if pp == NULL. 171 * 172 * When pp is not NULL, but *pp == NULL, we allocate the buffer, but since 173 * we're writing two ASN.1 objects back to back, we can't have i2d_X509() do 174 * the allocation, nor can we allow i2d_X509_CERT_AUX() to increment the 175 * allocated buffer. 176 */ 177 int i2d_X509_AUX(X509 *a, unsigned char **pp) 178 { 179 int length; 180 unsigned char *tmp; 181 182 /* Buffer provided by caller */ 183 if (pp == NULL || *pp != NULL) 184 return i2d_x509_aux_internal(a, pp); 185 186 /* Obtain the combined length */ 187 if ((length = i2d_x509_aux_internal(a, NULL)) <= 0) 188 return length; 189 190 /* Allocate requisite combined storage */ 191 *pp = tmp = OPENSSL_malloc(length); 192 if (tmp == NULL) { 193 X509err(X509_F_I2D_X509_AUX, ERR_R_MALLOC_FAILURE); 194 return -1; 195 } 196 197 /* Encode, but keep *pp at the originally malloced pointer */ 198 length = i2d_x509_aux_internal(a, &tmp); 199 if (length <= 0) { 200 OPENSSL_free(*pp); 201 *pp = NULL; 202 } 203 return length; 204 } 205 206 int i2d_re_X509_tbs(X509 *x, unsigned char **pp) 207 { 208 x->cert_info.enc.modified = 1; 209 return i2d_X509_CINF(&x->cert_info, pp); 210 } 211 212 void X509_get0_signature(const ASN1_BIT_STRING **psig, 213 const X509_ALGOR **palg, const X509 *x) 214 { 215 if (psig) 216 *psig = &x->signature; 217 if (palg) 218 *palg = &x->sig_alg; 219 } 220 221 int X509_get_signature_nid(const X509 *x) 222 { 223 return OBJ_obj2nid(x->sig_alg.algorithm); 224 } 225