1 /* 2 * Copyright 1999-2021 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 <stdio.h> 11 #include "internal/cryptlib.h" 12 #include <openssl/conf.h> 13 #include <openssl/asn1.h> 14 #include <openssl/asn1t.h> 15 #include <openssl/x509v3.h> 16 #include "crypto/x509.h" 17 #include "ext_dat.h" 18 19 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, 20 AUTHORITY_KEYID *akeyid, 21 STACK_OF(CONF_VALUE) 22 *extlist); 23 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, 24 X509V3_CTX *ctx, 25 STACK_OF(CONF_VALUE) *values); 26 27 const X509V3_EXT_METHOD ossl_v3_akey_id = { 28 NID_authority_key_identifier, 29 X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID), 30 0, 0, 0, 0, 31 0, 0, 32 (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID, 33 (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID, 34 0, 0, 35 NULL 36 }; 37 38 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, 39 AUTHORITY_KEYID *akeyid, 40 STACK_OF(CONF_VALUE) 41 *extlist) 42 { 43 char *tmp = NULL; 44 STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist; 45 46 if (akeyid->keyid) { 47 tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length); 48 if (tmp == NULL) { 49 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); 50 return NULL; 51 } 52 if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL, 53 tmp, &extlist)) { 54 OPENSSL_free(tmp); 55 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); 56 goto err; 57 } 58 OPENSSL_free(tmp); 59 } 60 if (akeyid->issuer) { 61 tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist); 62 if (tmpextlist == NULL) { 63 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); 64 goto err; 65 } 66 extlist = tmpextlist; 67 } 68 if (akeyid->serial) { 69 tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length); 70 if (tmp == NULL) { 71 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); 72 goto err; 73 } 74 if (!X509V3_add_value("serial", tmp, &extlist)) { 75 OPENSSL_free(tmp); 76 goto err; 77 } 78 OPENSSL_free(tmp); 79 } 80 return extlist; 81 err: 82 if (origextlist == NULL) 83 sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free); 84 return NULL; 85 } 86 87 /*- 88 * Currently two options: 89 * keyid: use the issuers subject keyid, the value 'always' means its is 90 * an error if the issuer certificate doesn't have a key id. 91 * issuer: use the issuers cert issuer and serial number. The default is 92 * to only use this if keyid is not present. With the option 'always' 93 * this is always included. 94 */ 95 96 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, 97 X509V3_CTX *ctx, 98 STACK_OF(CONF_VALUE) *values) 99 { 100 char keyid = 0, issuer = 0; 101 int i, n = sk_CONF_VALUE_num(values); 102 CONF_VALUE *cnf; 103 ASN1_OCTET_STRING *ikeyid = NULL; 104 X509_NAME *isname = NULL; 105 GENERAL_NAMES *gens = NULL; 106 GENERAL_NAME *gen = NULL; 107 ASN1_INTEGER *serial = NULL; 108 X509_EXTENSION *ext; 109 X509 *issuer_cert; 110 int same_issuer, ss; 111 AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new(); 112 113 if (akeyid == NULL) 114 goto err; 115 116 if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) { 117 return akeyid; 118 } 119 120 for (i = 0; i < n; i++) { 121 cnf = sk_CONF_VALUE_value(values, i); 122 if (strcmp(cnf->name, "keyid") == 0) { 123 keyid = 1; 124 if (cnf->value && strcmp(cnf->value, "always") == 0) 125 keyid = 2; 126 } else if (strcmp(cnf->name, "issuer") == 0) { 127 issuer = 1; 128 if (cnf->value && strcmp(cnf->value, "always") == 0) 129 issuer = 2; 130 } else { 131 ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION, 132 "name=%s", cnf->name); 133 goto err; 134 } 135 } 136 137 if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0) 138 return akeyid; 139 140 if (ctx == NULL) { 141 ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER); 142 goto err; 143 } 144 if ((issuer_cert = ctx->issuer_cert) == NULL) { 145 ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE); 146 goto err; 147 } 148 same_issuer = ctx->subject_cert == ctx->issuer_cert; 149 ERR_set_mark(); 150 if (ctx->issuer_pkey != NULL) 151 ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey); 152 else 153 ss = same_issuer; 154 ERR_pop_to_mark(); 155 156 /* unless forced with "always", AKID is suppressed for self-signed certs */ 157 if (keyid == 2 || (keyid == 1 && !ss)) { 158 /* 159 * prefer any pre-existing subject key identifier of the issuer cert 160 * except issuer cert is same as subject cert and is not self-signed 161 */ 162 i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1); 163 if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL 164 && !(same_issuer && !ss)) 165 ikeyid = X509V3_EXT_d2i(ext); 166 if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) { 167 /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */ 168 X509_PUBKEY *pubkey = NULL; 169 170 if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey)) 171 ikeyid = ossl_x509_pubkey_hash(pubkey); 172 X509_PUBKEY_free(pubkey); 173 } 174 if ((keyid == 2 || issuer == 0) 175 && (ikeyid == NULL 176 || ASN1_STRING_length(ikeyid) <= 2) /* indicating "none" */) { 177 ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID); 178 goto err; 179 } 180 } 181 182 if (issuer == 2 || (issuer == 1 && ikeyid == NULL)) { 183 isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert)); 184 serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert)); 185 if (isname == NULL || serial == NULL) { 186 ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS); 187 goto err; 188 } 189 } 190 191 if (isname != NULL) { 192 if ((gens = sk_GENERAL_NAME_new_null()) == NULL 193 || (gen = GENERAL_NAME_new()) == NULL 194 || !sk_GENERAL_NAME_push(gens, gen)) { 195 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); 196 goto err; 197 } 198 gen->type = GEN_DIRNAME; 199 gen->d.dirn = isname; 200 } 201 202 akeyid->issuer = gens; 203 gen = NULL; 204 gens = NULL; 205 akeyid->serial = serial; 206 akeyid->keyid = ikeyid; 207 208 return akeyid; 209 210 err: 211 sk_GENERAL_NAME_free(gens); 212 GENERAL_NAME_free(gen); 213 X509_NAME_free(isname); 214 ASN1_INTEGER_free(serial); 215 ASN1_OCTET_STRING_free(ikeyid); 216 AUTHORITY_KEYID_free(akeyid); 217 return NULL; 218 } 219