[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1t.h>
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| 13 | #include <openssl/x509.h>
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| 14 | #include "internal/x509_int.h"
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| 15 | #include <openssl/x509v3.h>
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| 16 | #include "x509_lcl.h"
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| 17 |
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| 18 | static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
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| 19 | const X509_REVOKED *const *b);
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| 20 | static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
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| 21 |
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| 22 | ASN1_SEQUENCE(X509_REVOKED) = {
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| 23 | ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
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| 24 | ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
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| 25 | ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
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| 26 | } ASN1_SEQUENCE_END(X509_REVOKED)
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| 27 |
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| 28 | static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
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| 29 | static int def_crl_lookup(X509_CRL *crl,
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| 30 | X509_REVOKED **ret, ASN1_INTEGER *serial,
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| 31 | X509_NAME *issuer);
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| 32 |
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| 33 | static X509_CRL_METHOD int_crl_meth = {
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| 34 | 0,
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| 35 | 0, 0,
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| 36 | def_crl_lookup,
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| 37 | def_crl_verify
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| 38 | };
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| 39 |
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| 40 | static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
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| 41 |
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| 42 | /*
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| 43 | * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
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| 44 | * the original encoding the signature won't be affected by reordering of the
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| 45 | * revoked field.
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| 46 | */
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| 47 | static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 48 | void *exarg)
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| 49 | {
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| 50 | X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
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| 51 |
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| 52 | if (!a || !a->revoked)
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| 53 | return 1;
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| 54 | switch (operation) {
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| 55 | /*
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| 56 | * Just set cmp function here. We don't sort because that would
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| 57 | * affect the output of X509_CRL_print().
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| 58 | */
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| 59 | case ASN1_OP_D2I_POST:
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| 60 | (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
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| 61 | break;
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| 62 | }
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| 63 | return 1;
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| 64 | }
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| 65 |
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| 66 |
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| 67 | ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
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| 68 | ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
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| 69 | ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
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| 70 | ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
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| 71 | ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
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| 72 | ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
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| 73 | ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
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| 74 | ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
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| 75 | } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
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| 76 |
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| 77 | /*
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| 78 | * Set CRL entry issuer according to CRL certificate issuer extension. Check
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| 79 | * for unhandled critical CRL entry extensions.
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| 80 | */
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| 81 |
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| 82 | static int crl_set_issuers(X509_CRL *crl)
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| 83 | {
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| 84 |
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| 85 | int i, j;
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| 86 | GENERAL_NAMES *gens, *gtmp;
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| 87 | STACK_OF(X509_REVOKED) *revoked;
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| 88 |
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| 89 | revoked = X509_CRL_get_REVOKED(crl);
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| 90 |
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| 91 | gens = NULL;
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| 92 | for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
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| 93 | X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
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| 94 | STACK_OF(X509_EXTENSION) *exts;
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| 95 | ASN1_ENUMERATED *reason;
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| 96 | X509_EXTENSION *ext;
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| 97 | gtmp = X509_REVOKED_get_ext_d2i(rev,
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| 98 | NID_certificate_issuer, &j, NULL);
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| 99 | if (!gtmp && (j != -1)) {
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| 100 | crl->flags |= EXFLAG_INVALID;
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| 101 | return 1;
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| 102 | }
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| 103 |
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| 104 | if (gtmp) {
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| 105 | gens = gtmp;
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| 106 | if (!crl->issuers) {
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| 107 | crl->issuers = sk_GENERAL_NAMES_new_null();
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| 108 | if (!crl->issuers)
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| 109 | return 0;
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| 110 | }
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| 111 | if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
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| 112 | return 0;
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| 113 | }
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| 114 | rev->issuer = gens;
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| 115 |
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| 116 | reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
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| 117 | if (!reason && (j != -1)) {
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| 118 | crl->flags |= EXFLAG_INVALID;
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| 119 | return 1;
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| 120 | }
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| 121 |
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| 122 | if (reason) {
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| 123 | rev->reason = ASN1_ENUMERATED_get(reason);
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| 124 | ASN1_ENUMERATED_free(reason);
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| 125 | } else
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| 126 | rev->reason = CRL_REASON_NONE;
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| 127 |
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| 128 | /* Check for critical CRL entry extensions */
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| 129 |
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| 130 | exts = rev->extensions;
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| 131 |
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| 132 | for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
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| 133 | ext = sk_X509_EXTENSION_value(exts, j);
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| 134 | if (X509_EXTENSION_get_critical(ext)) {
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| 135 | if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
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| 136 | continue;
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| 137 | crl->flags |= EXFLAG_CRITICAL;
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| 138 | break;
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| 139 | }
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| 140 | }
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| 141 |
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| 142 | }
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| 143 |
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| 144 | return 1;
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| 145 |
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| 146 | }
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| 147 |
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| 148 | /*
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| 149 | * The X509_CRL structure needs a bit of customisation. Cache some extensions
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| 150 | * and hash of the whole CRL.
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| 151 | */
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| 152 | static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
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| 153 | void *exarg)
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| 154 | {
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| 155 | X509_CRL *crl = (X509_CRL *)*pval;
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| 156 | STACK_OF(X509_EXTENSION) *exts;
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| 157 | X509_EXTENSION *ext;
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| 158 | int idx;
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| 159 |
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| 160 | switch (operation) {
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| 161 | case ASN1_OP_NEW_POST:
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| 162 | crl->idp = NULL;
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| 163 | crl->akid = NULL;
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| 164 | crl->flags = 0;
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| 165 | crl->idp_flags = 0;
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| 166 | crl->idp_reasons = CRLDP_ALL_REASONS;
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| 167 | crl->meth = default_crl_method;
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| 168 | crl->meth_data = NULL;
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| 169 | crl->issuers = NULL;
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| 170 | crl->crl_number = NULL;
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| 171 | crl->base_crl_number = NULL;
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| 172 | break;
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| 173 |
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| 174 | case ASN1_OP_D2I_POST:
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| 175 | X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
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| 176 | crl->idp = X509_CRL_get_ext_d2i(crl,
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| 177 | NID_issuing_distribution_point, NULL,
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| 178 | NULL);
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| 179 | if (crl->idp)
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| 180 | setup_idp(crl, crl->idp);
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| 181 |
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| 182 | crl->akid = X509_CRL_get_ext_d2i(crl,
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| 183 | NID_authority_key_identifier, NULL,
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| 184 | NULL);
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| 185 |
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| 186 | crl->crl_number = X509_CRL_get_ext_d2i(crl,
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| 187 | NID_crl_number, NULL, NULL);
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| 188 |
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| 189 | crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
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| 190 | NID_delta_crl, NULL,
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| 191 | NULL);
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| 192 | /* Delta CRLs must have CRL number */
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| 193 | if (crl->base_crl_number && !crl->crl_number)
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| 194 | crl->flags |= EXFLAG_INVALID;
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| 195 |
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| 196 | /*
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| 197 | * See if we have any unhandled critical CRL extensions and indicate
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| 198 | * this in a flag. We only currently handle IDP so anything else
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| 199 | * critical sets the flag. This code accesses the X509_CRL structure
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| 200 | * directly: applications shouldn't do this.
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| 201 | */
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| 202 |
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| 203 | exts = crl->crl.extensions;
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| 204 |
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| 205 | for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
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| 206 | int nid;
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| 207 | ext = sk_X509_EXTENSION_value(exts, idx);
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| 208 | nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
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| 209 | if (nid == NID_freshest_crl)
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| 210 | crl->flags |= EXFLAG_FRESHEST;
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| 211 | if (X509_EXTENSION_get_critical(ext)) {
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| 212 | /* We handle IDP and deltas */
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| 213 | if ((nid == NID_issuing_distribution_point)
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| 214 | || (nid == NID_authority_key_identifier)
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| 215 | || (nid == NID_delta_crl))
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| 216 | continue;
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| 217 | crl->flags |= EXFLAG_CRITICAL;
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| 218 | break;
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| 219 | }
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| 220 | }
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| 221 |
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| 222 | if (!crl_set_issuers(crl))
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| 223 | return 0;
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| 224 |
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| 225 | if (crl->meth->crl_init) {
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| 226 | if (crl->meth->crl_init(crl) == 0)
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| 227 | return 0;
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| 228 | }
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| 229 |
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| 230 | crl->flags |= EXFLAG_SET;
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| 231 | break;
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| 232 |
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| 233 | case ASN1_OP_FREE_POST:
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| 234 | if (crl->meth->crl_free) {
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| 235 | if (!crl->meth->crl_free(crl))
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| 236 | return 0;
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| 237 | }
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| 238 | AUTHORITY_KEYID_free(crl->akid);
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| 239 | ISSUING_DIST_POINT_free(crl->idp);
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| 240 | ASN1_INTEGER_free(crl->crl_number);
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| 241 | ASN1_INTEGER_free(crl->base_crl_number);
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| 242 | sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
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| 243 | break;
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| 244 | }
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| 245 | return 1;
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| 246 | }
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| 247 |
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| 248 | /* Convert IDP into a more convenient form */
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| 249 |
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| 250 | static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
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| 251 | {
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| 252 | int idp_only = 0;
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| 253 | /* Set various flags according to IDP */
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| 254 | crl->idp_flags |= IDP_PRESENT;
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| 255 | if (idp->onlyuser > 0) {
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| 256 | idp_only++;
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| 257 | crl->idp_flags |= IDP_ONLYUSER;
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| 258 | }
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| 259 | if (idp->onlyCA > 0) {
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| 260 | idp_only++;
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| 261 | crl->idp_flags |= IDP_ONLYCA;
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| 262 | }
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| 263 | if (idp->onlyattr > 0) {
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| 264 | idp_only++;
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| 265 | crl->idp_flags |= IDP_ONLYATTR;
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| 266 | }
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| 267 |
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| 268 | if (idp_only > 1)
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| 269 | crl->idp_flags |= IDP_INVALID;
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| 270 |
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| 271 | if (idp->indirectCRL > 0)
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| 272 | crl->idp_flags |= IDP_INDIRECT;
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| 273 |
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| 274 | if (idp->onlysomereasons) {
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| 275 | crl->idp_flags |= IDP_REASONS;
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| 276 | if (idp->onlysomereasons->length > 0)
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| 277 | crl->idp_reasons = idp->onlysomereasons->data[0];
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| 278 | if (idp->onlysomereasons->length > 1)
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| 279 | crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
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| 280 | crl->idp_reasons &= CRLDP_ALL_REASONS;
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| 281 | }
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| 282 |
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| 283 | DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
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| 284 | }
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| 285 |
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| 286 | ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
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| 287 | ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
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| 288 | ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
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| 289 | ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
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| 290 | } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
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| 291 |
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| 292 | IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
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| 293 |
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| 294 | IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
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| 295 |
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| 296 | IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
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| 297 |
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| 298 | IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
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| 299 |
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| 300 | IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
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| 301 |
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| 302 | static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
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| 303 | const X509_REVOKED *const *b)
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| 304 | {
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| 305 | return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
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| 306 | (ASN1_STRING *)&(*b)->serialNumber));
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| 307 | }
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| 308 |
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| 309 | int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
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| 310 | {
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| 311 | X509_CRL_INFO *inf;
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| 312 | inf = &crl->crl;
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| 313 | if (inf->revoked == NULL)
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| 314 | inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
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| 315 | if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
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| 316 | ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
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| 317 | return 0;
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| 318 | }
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| 319 | inf->enc.modified = 1;
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| 320 | return 1;
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| 321 | }
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| 322 |
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| 323 | int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
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| 324 | {
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| 325 | if (crl->meth->crl_verify)
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| 326 | return crl->meth->crl_verify(crl, r);
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| 327 | return 0;
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| 328 | }
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| 329 |
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| 330 | int X509_CRL_get0_by_serial(X509_CRL *crl,
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| 331 | X509_REVOKED **ret, ASN1_INTEGER *serial)
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| 332 | {
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| 333 | if (crl->meth->crl_lookup)
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| 334 | return crl->meth->crl_lookup(crl, ret, serial, NULL);
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| 335 | return 0;
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| 336 | }
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| 337 |
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| 338 | int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
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| 339 | {
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| 340 | if (crl->meth->crl_lookup)
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| 341 | return crl->meth->crl_lookup(crl, ret,
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| 342 | X509_get_serialNumber(x),
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| 343 | X509_get_issuer_name(x));
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| 344 | return 0;
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| 345 | }
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| 346 |
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| 347 | static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
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| 348 | {
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| 349 | return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
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| 350 | &crl->sig_alg, &crl->signature, &crl->crl, r));
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| 351 | }
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| 352 |
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| 353 | static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
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| 354 | X509_REVOKED *rev)
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| 355 | {
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| 356 | int i;
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| 357 |
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| 358 | if (!rev->issuer) {
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| 359 | if (!nm)
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| 360 | return 1;
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| 361 | if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
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| 362 | return 1;
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| 363 | return 0;
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| 364 | }
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| 365 |
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| 366 | if (!nm)
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| 367 | nm = X509_CRL_get_issuer(crl);
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| 368 |
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| 369 | for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
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| 370 | GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
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| 371 | if (gen->type != GEN_DIRNAME)
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| 372 | continue;
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| 373 | if (!X509_NAME_cmp(nm, gen->d.directoryName))
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| 374 | return 1;
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| 375 | }
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| 376 | return 0;
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| 377 |
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| 378 | }
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| 379 |
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| 380 | static int def_crl_lookup(X509_CRL *crl,
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| 381 | X509_REVOKED **ret, ASN1_INTEGER *serial,
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| 382 | X509_NAME *issuer)
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| 383 | {
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| 384 | X509_REVOKED rtmp, *rev;
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| 385 | int idx;
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| 386 | rtmp.serialNumber = *serial;
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| 387 | /*
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| 388 | * Sort revoked into serial number order if not already sorted. Do this
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| 389 | * under a lock to avoid race condition.
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| 390 | */
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| 391 | if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
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| 392 | CRYPTO_THREAD_write_lock(crl->lock);
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| 393 | sk_X509_REVOKED_sort(crl->crl.revoked);
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| 394 | CRYPTO_THREAD_unlock(crl->lock);
|
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| 395 | }
|
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| 396 | idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
|
---|
| 397 | if (idx < 0)
|
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| 398 | return 0;
|
---|
| 399 | /* Need to look for matching name */
|
---|
| 400 | for (; idx < sk_X509_REVOKED_num(crl->crl.revoked); idx++) {
|
---|
| 401 | rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
|
---|
| 402 | if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
|
---|
| 403 | return 0;
|
---|
| 404 | if (crl_revoked_issuer_match(crl, issuer, rev)) {
|
---|
| 405 | if (ret)
|
---|
| 406 | *ret = rev;
|
---|
| 407 | if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
|
---|
| 408 | return 2;
|
---|
| 409 | return 1;
|
---|
| 410 | }
|
---|
| 411 | }
|
---|
| 412 | return 0;
|
---|
| 413 | }
|
---|
| 414 |
|
---|
| 415 | void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
|
---|
| 416 | {
|
---|
| 417 | if (meth == NULL)
|
---|
| 418 | default_crl_method = &int_crl_meth;
|
---|
| 419 | else
|
---|
| 420 | default_crl_method = meth;
|
---|
| 421 | }
|
---|
| 422 |
|
---|
| 423 | X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
|
---|
| 424 | int (*crl_free) (X509_CRL *crl),
|
---|
| 425 | int (*crl_lookup) (X509_CRL *crl,
|
---|
| 426 | X509_REVOKED **ret,
|
---|
| 427 | ASN1_INTEGER *ser,
|
---|
| 428 | X509_NAME *issuer),
|
---|
| 429 | int (*crl_verify) (X509_CRL *crl,
|
---|
| 430 | EVP_PKEY *pk))
|
---|
| 431 | {
|
---|
| 432 | X509_CRL_METHOD *m;
|
---|
| 433 | m = OPENSSL_malloc(sizeof(*m));
|
---|
| 434 | if (m == NULL)
|
---|
| 435 | return NULL;
|
---|
| 436 | m->crl_init = crl_init;
|
---|
| 437 | m->crl_free = crl_free;
|
---|
| 438 | m->crl_lookup = crl_lookup;
|
---|
| 439 | m->crl_verify = crl_verify;
|
---|
| 440 | m->flags = X509_CRL_METHOD_DYNAMIC;
|
---|
| 441 | return m;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
|
---|
| 445 | {
|
---|
| 446 | if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
|
---|
| 447 | return;
|
---|
| 448 | OPENSSL_free(m);
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
|
---|
| 452 | {
|
---|
| 453 | crl->meth_data = dat;
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | void *X509_CRL_get_meth_data(X509_CRL *crl)
|
---|
| 457 | {
|
---|
| 458 | return crl->meth_data;
|
---|
| 459 | }
|
---|