| 1 | /*
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| 2 | * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (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 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/conf.h>
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| 13 | #include <openssl/asn1.h>
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| 14 | #include <openssl/asn1t.h>
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| 15 | #include <openssl/x509v3.h>
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| 16 | #include "crypto/x509.h"
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| 17 | #include "ext_dat.h"
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| 18 |
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| 19 | static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
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| 20 | AUTHORITY_KEYID *akeyid,
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| 21 | STACK_OF(CONF_VALUE)
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| 22 | *extlist);
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| 23 | static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
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| 24 | X509V3_CTX *ctx,
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| 25 | STACK_OF(CONF_VALUE) *values);
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| 26 |
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| 27 | const X509V3_EXT_METHOD ossl_v3_akey_id = {
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| 28 | NID_authority_key_identifier,
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| 29 | X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
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| 30 | 0, 0, 0, 0,
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| 31 | 0, 0,
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| 32 | (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
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| 33 | (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
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| 34 | 0, 0,
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| 35 | NULL
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| 36 | };
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| 37 |
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| 38 | static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
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| 39 | AUTHORITY_KEYID *akeyid,
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| 40 | STACK_OF(CONF_VALUE)
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| 41 | *extlist)
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| 42 | {
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| 43 | char *tmp = NULL;
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| 44 | STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist;
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| 45 |
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| 46 | if (akeyid->keyid) {
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| 47 | tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->keyid);
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| 48 | if (tmp == NULL) {
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| 49 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
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| 50 | return NULL;
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| 51 | }
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| 52 | if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
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| 53 | tmp, &extlist)) {
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| 54 | OPENSSL_free(tmp);
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| 55 | ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
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| 56 | goto err;
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| 57 | }
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| 58 | OPENSSL_free(tmp);
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| 59 | }
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| 60 | if (akeyid->issuer) {
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| 61 | tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
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| 62 | if (tmpextlist == NULL) {
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| 63 | ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
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| 64 | goto err;
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| 65 | }
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| 66 | extlist = tmpextlist;
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| 67 | }
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| 68 | if (akeyid->serial) {
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| 69 | tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->serial);
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| 70 | if (tmp == NULL) {
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| 71 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
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| 72 | goto err;
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| 73 | }
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| 74 | if (!X509V3_add_value("serial", tmp, &extlist)) {
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| 75 | OPENSSL_free(tmp);
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| 76 | goto err;
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| 77 | }
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| 78 | OPENSSL_free(tmp);
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| 79 | }
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| 80 | return extlist;
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| 81 | err:
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| 82 | if (origextlist == NULL)
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| 83 | sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free);
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| 84 | return NULL;
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| 85 | }
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| 86 |
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| 87 | /*-
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| 88 | * Three explicit tags may be given, where 'keyid' and 'issuer' may be combined:
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| 89 | * 'none': do not add any authority key identifier.
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| 90 | * 'keyid': use the issuer's subject keyid; the option 'always' means its is
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| 91 | * an error if the issuer certificate doesn't have a subject key id.
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| 92 | * 'issuer': use the issuer's cert issuer and serial number. The default is
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| 93 | * to only use this if 'keyid' is not present. With the option 'always'
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| 94 | * this is always included.
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| 95 | */
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| 96 | static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
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| 97 | X509V3_CTX *ctx,
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| 98 | STACK_OF(CONF_VALUE) *values)
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| 99 | {
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| 100 | char keyid = 0, issuer = 0;
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| 101 | int i, n = sk_CONF_VALUE_num(values);
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| 102 | CONF_VALUE *cnf;
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| 103 | ASN1_OCTET_STRING *ikeyid = NULL;
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| 104 | X509_NAME *isname = NULL;
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| 105 | GENERAL_NAMES *gens = NULL;
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| 106 | GENERAL_NAME *gen = NULL;
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| 107 | ASN1_INTEGER *serial = NULL;
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| 108 | X509_EXTENSION *ext;
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| 109 | X509 *issuer_cert;
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| 110 | int same_issuer, ss;
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| 111 | AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new();
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| 112 |
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| 113 | if (akeyid == NULL)
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| 114 | goto err;
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| 115 |
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| 116 | if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) {
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| 117 | return akeyid;
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| 118 | }
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| 119 |
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| 120 | for (i = 0; i < n; i++) {
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| 121 | cnf = sk_CONF_VALUE_value(values, i);
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| 122 | if (cnf->value != NULL && strcmp(cnf->value, "always") != 0) {
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| 123 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION,
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| 124 | "name=%s option=%s", cnf->name, cnf->value);
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| 125 | goto err;
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| 126 | }
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| 127 | if (strcmp(cnf->name, "keyid") == 0 && keyid == 0) {
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| 128 | keyid = 1;
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| 129 | if (cnf->value != NULL)
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| 130 | keyid = 2;
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| 131 | } else if (strcmp(cnf->name, "issuer") == 0 && issuer == 0) {
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| 132 | issuer = 1;
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| 133 | if (cnf->value != NULL)
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| 134 | issuer = 2;
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| 135 | } else if (strcmp(cnf->name, "none") == 0
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| 136 | || strcmp(cnf->name, "keyid") == 0
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| 137 | || strcmp(cnf->name, "issuer") == 0) {
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| 138 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_VALUE,
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| 139 | "name=%s", cnf->name);
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| 140 | goto err;
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| 141 | } else {
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| 142 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_VALUE,
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| 143 | "name=%s", cnf->name);
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| 144 | goto err;
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| 145 | }
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| 146 | }
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| 147 |
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| 148 | if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
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| 149 | return akeyid;
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| 150 |
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| 151 | if (ctx == NULL) {
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| 152 | ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
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| 153 | goto err;
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| 154 | }
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| 155 | if ((issuer_cert = ctx->issuer_cert) == NULL) {
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| 156 | ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
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| 157 | goto err;
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| 158 | }
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| 159 | same_issuer = ctx->subject_cert == ctx->issuer_cert;
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| 160 | ERR_set_mark();
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| 161 | if (ctx->issuer_pkey != NULL)
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| 162 | ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey);
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| 163 | else
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| 164 | ss = same_issuer;
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| 165 | ERR_pop_to_mark();
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| 166 |
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| 167 | /* unless forced with "always", AKID is suppressed for self-signed certs */
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| 168 | if (keyid == 2 || (keyid == 1 && !ss)) {
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| 169 | /*
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| 170 | * prefer any pre-existing subject key identifier of the issuer cert
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| 171 | * except issuer cert is same as subject cert and is not self-signed
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| 172 | */
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| 173 | i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1);
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| 174 | if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL
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| 175 | && !(same_issuer && !ss)) {
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| 176 | ikeyid = X509V3_EXT_d2i(ext);
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| 177 | if (ASN1_STRING_length(ikeyid) == 0) /* indicating "none" */ {
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| 178 | ASN1_OCTET_STRING_free(ikeyid);
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| 179 | ikeyid = NULL;
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| 180 | }
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| 181 | }
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| 182 | if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) {
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| 183 | /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */
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| 184 | X509_PUBKEY *pubkey = NULL;
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| 185 |
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| 186 | if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey))
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| 187 | ikeyid = ossl_x509_pubkey_hash(pubkey);
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| 188 | X509_PUBKEY_free(pubkey);
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| 189 | }
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| 190 | if (keyid == 2 && ikeyid == NULL) {
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| 191 | ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
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| 192 | goto err;
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| 193 | }
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| 194 | }
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| 195 |
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| 196 | if (issuer == 2 || (issuer == 1 && !ss && ikeyid == NULL)) {
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| 197 | isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert));
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| 198 | serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert));
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| 199 | if (isname == NULL || serial == NULL) {
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| 200 | ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
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| 201 | goto err;
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | if (isname != NULL) {
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| 206 | if ((gens = sk_GENERAL_NAME_new_null()) == NULL
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| 207 | || (gen = GENERAL_NAME_new()) == NULL) {
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| 208 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
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| 209 | goto err;
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| 210 | }
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| 211 | if (!sk_GENERAL_NAME_push(gens, gen)) {
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| 212 | ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
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| 213 | goto err;
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| 214 | }
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| 215 | gen->type = GEN_DIRNAME;
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| 216 | gen->d.dirn = isname;
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| 217 | }
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| 218 |
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| 219 | akeyid->issuer = gens;
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| 220 | gen = NULL;
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| 221 | gens = NULL;
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| 222 | akeyid->serial = serial;
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| 223 | akeyid->keyid = ikeyid;
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| 224 |
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| 225 | return akeyid;
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| 226 |
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| 227 | err:
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| 228 | sk_GENERAL_NAME_free(gens);
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| 229 | GENERAL_NAME_free(gen);
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| 230 | X509_NAME_free(isname);
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| 231 | ASN1_INTEGER_free(serial);
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| 232 | ASN1_OCTET_STRING_free(ikeyid);
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| 233 | AUTHORITY_KEYID_free(akeyid);
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| 234 | return NULL;
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| 235 | }
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