558 lines
16 KiB
C
558 lines
16 KiB
C
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/*
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* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "crypto/ctype.h"
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include "crypto/x509.h"
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#include "crypto/asn1.h"
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#include "x509_local.h"
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/*
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* Maximum length of X509_NAME: much larger than anything we should
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* ever see in practice.
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*/
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#define X509_NAME_MAX (1024 * 1024)
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static int x509_name_ex_d2i(ASN1_VALUE **val,
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const unsigned char **in, long len,
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const ASN1_ITEM *it,
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int tag, int aclass, char opt, ASN1_TLC *ctx);
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static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass);
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static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
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static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
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static int x509_name_encode(X509_NAME *a);
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static int x509_name_canon(X509_NAME *a);
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static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in);
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static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
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unsigned char **in);
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static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
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int indent,
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const char *fname, const ASN1_PCTX *pctx);
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ASN1_SEQUENCE(X509_NAME_ENTRY) = {
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ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
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ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
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} ASN1_SEQUENCE_END(X509_NAME_ENTRY)
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IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
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IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
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/*
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* For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
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* declare two template wrappers for this
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*/
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ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
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ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
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static_ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
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ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
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ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
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static_ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
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/*
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* Normally that's where it would end: we'd have two nested STACK structures
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* representing the ASN1. Unfortunately X509_NAME uses a completely different
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* form and caches encodings so we have to process the internal form and
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* convert to the external form.
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*/
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static const ASN1_EXTERN_FUNCS x509_name_ff = {
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NULL,
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x509_name_ex_new,
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x509_name_ex_free,
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0, /* Default clear behaviour is OK */
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x509_name_ex_d2i,
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x509_name_ex_i2d,
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x509_name_ex_print
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};
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IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
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IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
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IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
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static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
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{
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X509_NAME *ret = OPENSSL_zalloc(sizeof(*ret));
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if (ret == NULL)
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return 0;
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if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
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goto err;
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}
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if ((ret->bytes = BUF_MEM_new()) == NULL) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
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goto err;
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}
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ret->modified = 1;
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*val = (ASN1_VALUE *)ret;
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return 1;
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err:
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if (ret) {
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sk_X509_NAME_ENTRY_free(ret->entries);
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OPENSSL_free(ret);
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}
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return 0;
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}
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static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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X509_NAME *a;
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if (pval == NULL || *pval == NULL)
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return;
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a = (X509_NAME *)*pval;
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BUF_MEM_free(a->bytes);
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sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
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OPENSSL_free(a->canon_enc);
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OPENSSL_free(a);
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*pval = NULL;
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}
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static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
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{
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sk_X509_NAME_ENTRY_free(ne);
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}
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static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
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{
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sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
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}
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static int x509_name_ex_d2i(ASN1_VALUE **val,
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const unsigned char **in, long len,
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const ASN1_ITEM *it, int tag, int aclass,
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char opt, ASN1_TLC *ctx)
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{
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const unsigned char *p = *in, *q;
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union {
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
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ASN1_VALUE *a;
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} intname = {
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NULL
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};
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union {
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X509_NAME *x;
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ASN1_VALUE *a;
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} nm = {
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NULL
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};
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int i, j, ret;
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STACK_OF(X509_NAME_ENTRY) *entries;
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X509_NAME_ENTRY *entry;
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if (len > X509_NAME_MAX)
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len = X509_NAME_MAX;
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q = p;
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/* Get internal representation of Name */
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ret = ASN1_item_ex_d2i(&intname.a,
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&p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
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tag, aclass, opt, ctx);
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if (ret <= 0)
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return ret;
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if (*val)
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x509_name_ex_free(val, NULL);
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if (!x509_name_ex_new(&nm.a, NULL))
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goto err;
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/* We've decoded it: now cache encoding */
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if (!BUF_MEM_grow(nm.x->bytes, p - q))
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goto err;
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memcpy(nm.x->bytes->data, q, p - q);
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/* Convert internal representation to X509_NAME structure */
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for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
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entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
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for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
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entry = sk_X509_NAME_ENTRY_value(entries, j);
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entry->set = i;
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if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
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goto err;
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(void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
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}
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}
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ret = x509_name_canon(nm.x);
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if (!ret)
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goto err;
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
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local_sk_X509_NAME_ENTRY_free);
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nm.x->modified = 0;
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*val = nm.a;
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*in = p;
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return ret;
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err:
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if (nm.x != NULL)
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X509_NAME_free(nm.x);
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
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local_sk_X509_NAME_ENTRY_pop_free);
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ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
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return 0;
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}
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static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass)
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{
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int ret;
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X509_NAME *a = (X509_NAME *)*val;
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if (a->modified) {
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ret = x509_name_encode(a);
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if (ret < 0)
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return ret;
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ret = x509_name_canon(a);
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if (!ret)
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return -1;
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}
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ret = a->bytes->length;
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if (out != NULL) {
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memcpy(*out, a->bytes->data, ret);
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*out += ret;
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}
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return ret;
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}
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static int x509_name_encode(X509_NAME *a)
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{
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union {
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
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const ASN1_VALUE *a;
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} intname = {
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NULL
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};
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int len;
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unsigned char *p;
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STACK_OF(X509_NAME_ENTRY) *entries = NULL;
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X509_NAME_ENTRY *entry;
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int i, set = -1;
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intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
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if (!intname.s)
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goto cerr;
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for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
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entry = sk_X509_NAME_ENTRY_value(a->entries, i);
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if (entry->set != set) {
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entries = sk_X509_NAME_ENTRY_new_null();
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if (!entries)
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goto cerr;
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if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
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sk_X509_NAME_ENTRY_free(entries);
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goto cerr;
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}
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set = entry->set;
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}
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if (!sk_X509_NAME_ENTRY_push(entries, entry))
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goto cerr;
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}
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len = ASN1_item_ex_i2d(&intname.a, NULL,
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ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
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if (!BUF_MEM_grow(a->bytes, len)) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB);
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goto err;
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}
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p = (unsigned char *)a->bytes->data;
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ASN1_item_ex_i2d(&intname.a,
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&p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
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local_sk_X509_NAME_ENTRY_free);
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a->modified = 0;
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return len;
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cerr:
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ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
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err:
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
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local_sk_X509_NAME_ENTRY_free);
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return -1;
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}
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static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
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int indent,
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const char *fname, const ASN1_PCTX *pctx)
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{
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if (X509_NAME_print_ex(out, (const X509_NAME *)*pval,
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indent, pctx->nm_flags) <= 0)
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return 0;
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return 2;
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}
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/*
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* This function generates the canonical encoding of the Name structure. In
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* it all strings are converted to UTF8, leading, trailing and multiple
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* spaces collapsed, converted to lower case and the leading SEQUENCE header
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* removed. In future we could also normalize the UTF8 too. By doing this
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* comparison of Name structures can be rapidly performed by just using
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* memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
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* constraints of type dirName can also be checked with a simple memcmp().
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* NOTE: For empty X509_NAME (NULL-DN), canon_enclen == 0 && canon_enc == NULL
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*/
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static int x509_name_canon(X509_NAME *a)
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{
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unsigned char *p;
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname;
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STACK_OF(X509_NAME_ENTRY) *entries = NULL;
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X509_NAME_ENTRY *entry, *tmpentry = NULL;
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int i, set = -1, ret = 0, len;
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OPENSSL_free(a->canon_enc);
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a->canon_enc = NULL;
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/* Special case: empty X509_NAME => null encoding */
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if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
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a->canon_enclen = 0;
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return 1;
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}
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intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
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if (intname == NULL) {
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ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
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goto err;
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}
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for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
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entry = sk_X509_NAME_ENTRY_value(a->entries, i);
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if (entry->set != set) {
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entries = sk_X509_NAME_ENTRY_new_null();
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if (entries == NULL)
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goto err;
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if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
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sk_X509_NAME_ENTRY_free(entries);
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ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
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goto err;
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}
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set = entry->set;
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}
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tmpentry = X509_NAME_ENTRY_new();
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if (tmpentry == NULL) {
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ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);
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goto err;
|
||
|
|
}
|
||
|
|
tmpentry->object = OBJ_dup(entry->object);
|
||
|
|
if (tmpentry->object == NULL) {
|
||
|
|
ERR_raise(ERR_LIB_X509, ERR_R_OBJ_LIB);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
if (!asn1_string_canon(tmpentry->value, entry->value))
|
||
|
|
goto err;
|
||
|
|
if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) {
|
||
|
|
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
tmpentry = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Finally generate encoding */
|
||
|
|
len = i2d_name_canon(intname, NULL);
|
||
|
|
if (len < 0)
|
||
|
|
goto err;
|
||
|
|
a->canon_enclen = len;
|
||
|
|
|
||
|
|
p = OPENSSL_malloc(a->canon_enclen);
|
||
|
|
if (p == NULL)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
a->canon_enc = p;
|
||
|
|
|
||
|
|
i2d_name_canon(intname, &p);
|
||
|
|
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
X509_NAME_ENTRY_free(tmpentry);
|
||
|
|
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
|
||
|
|
local_sk_X509_NAME_ENTRY_pop_free);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Bitmap of all the types of string that will be canonicalized. */
|
||
|
|
|
||
|
|
#define ASN1_MASK_CANON \
|
||
|
|
(B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
|
||
|
|
| B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
|
||
|
|
| B_ASN1_VISIBLESTRING)
|
||
|
|
|
||
|
|
static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in)
|
||
|
|
{
|
||
|
|
unsigned char *to, *from;
|
||
|
|
int len, i;
|
||
|
|
|
||
|
|
/* If type not in bitmask just copy string across */
|
||
|
|
if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
|
||
|
|
if (!ASN1_STRING_copy(out, in))
|
||
|
|
return 0;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
out->type = V_ASN1_UTF8STRING;
|
||
|
|
out->length = ASN1_STRING_to_UTF8(&out->data, in);
|
||
|
|
if (out->length == -1)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
to = out->data;
|
||
|
|
from = to;
|
||
|
|
|
||
|
|
len = out->length;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Convert string in place to canonical form. Ultimately we may need to
|
||
|
|
* handle a wider range of characters but for now ignore anything with
|
||
|
|
* MSB set and rely on the ossl_isspace() to fail on bad characters without
|
||
|
|
* needing isascii or range checks as well.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Ignore leading spaces */
|
||
|
|
while (len > 0 && ossl_isspace(*from)) {
|
||
|
|
from++;
|
||
|
|
len--;
|
||
|
|
}
|
||
|
|
|
||
|
|
to = from + len;
|
||
|
|
|
||
|
|
/* Ignore trailing spaces */
|
||
|
|
while (len > 0 && ossl_isspace(to[-1])) {
|
||
|
|
to--;
|
||
|
|
len--;
|
||
|
|
}
|
||
|
|
|
||
|
|
to = out->data;
|
||
|
|
|
||
|
|
i = 0;
|
||
|
|
while (i < len) {
|
||
|
|
/* If not ASCII set just copy across */
|
||
|
|
if (!ossl_isascii(*from)) {
|
||
|
|
*to++ = *from++;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
/* Collapse multiple spaces */
|
||
|
|
else if (ossl_isspace(*from)) {
|
||
|
|
/* Copy one space across */
|
||
|
|
*to++ = ' ';
|
||
|
|
/*
|
||
|
|
* Ignore subsequent spaces. Note: don't need to check len here
|
||
|
|
* because we know the last character is a non-space so we can't
|
||
|
|
* overflow.
|
||
|
|
*/
|
||
|
|
do {
|
||
|
|
from++;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
while (ossl_isspace(*from));
|
||
|
|
} else {
|
||
|
|
*to++ = ossl_tolower(*from);
|
||
|
|
from++;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
out->length = to - out->data;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
|
||
|
|
unsigned char **in)
|
||
|
|
{
|
||
|
|
int i, len, ltmp;
|
||
|
|
const ASN1_VALUE *v;
|
||
|
|
STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
|
||
|
|
|
||
|
|
len = 0;
|
||
|
|
for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
|
||
|
|
v = sk_ASN1_VALUE_value(intname, i);
|
||
|
|
ltmp = ASN1_item_ex_i2d(&v, in,
|
||
|
|
ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
|
||
|
|
if (ltmp < 0)
|
||
|
|
return ltmp;
|
||
|
|
len += ltmp;
|
||
|
|
}
|
||
|
|
return len;
|
||
|
|
}
|
||
|
|
|
||
|
|
int X509_NAME_set(X509_NAME **xn, const X509_NAME *name)
|
||
|
|
{
|
||
|
|
X509_NAME *name_copy;
|
||
|
|
|
||
|
|
if (*xn == name)
|
||
|
|
return *xn != NULL;
|
||
|
|
if ((name_copy = X509_NAME_dup(name)) == NULL)
|
||
|
|
return 0;
|
||
|
|
X509_NAME_free(*xn);
|
||
|
|
*xn = name_copy;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
|
||
|
|
{
|
||
|
|
char *s, *c, *b;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
b = X509_NAME_oneline(name, NULL, 0);
|
||
|
|
if (b == NULL)
|
||
|
|
return 0;
|
||
|
|
if (*b == '\0') {
|
||
|
|
OPENSSL_free(b);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
s = b + 1; /* skip the first slash */
|
||
|
|
|
||
|
|
c = s;
|
||
|
|
for (;;) {
|
||
|
|
if (((*s == '/') &&
|
||
|
|
(ossl_isupper(s[1]) && ((s[2] == '=') ||
|
||
|
|
(ossl_isupper(s[2]) && (s[3] == '='))
|
||
|
|
))) || (*s == '\0'))
|
||
|
|
{
|
||
|
|
i = s - c;
|
||
|
|
if (BIO_write(bp, c, i) != i)
|
||
|
|
goto err;
|
||
|
|
c = s + 1; /* skip following slash */
|
||
|
|
if (*s != '\0') {
|
||
|
|
if (BIO_write(bp, ", ", 2) != 2)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (*s == '\0')
|
||
|
|
break;
|
||
|
|
s++;
|
||
|
|
}
|
||
|
|
|
||
|
|
OPENSSL_free(b);
|
||
|
|
return 1;
|
||
|
|
err:
|
||
|
|
ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
|
||
|
|
OPENSSL_free(b);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int X509_NAME_get0_der(const X509_NAME *nm, const unsigned char **pder,
|
||
|
|
size_t *pderlen)
|
||
|
|
{
|
||
|
|
/* Make sure encoding is valid */
|
||
|
|
if (i2d_X509_NAME(nm, NULL) <= 0)
|
||
|
|
return 0;
|
||
|
|
if (pder != NULL)
|
||
|
|
*pder = (unsigned char *)nm->bytes->data;
|
||
|
|
if (pderlen != NULL)
|
||
|
|
*pderlen = nm->bytes->length;
|
||
|
|
return 1;
|
||
|
|
}
|