pineapple/externals/libressl/crypto/x509/x509_ncons.c
2022-04-24 22:29:35 +02:00

556 lines
15 KiB
C
Executable file

/* $OpenBSD: x509_ncons.c,v 1.5 2021/11/01 20:53:08 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/asn1t.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/x509v3.h>
#include "x509_lcl.h"
static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval);
static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method,
void *a, BIO *bp, int ind);
static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp, int ind, char *name);
static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
static int nc_dn(X509_NAME *sub, X509_NAME *nm);
static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
const X509V3_EXT_METHOD v3_name_constraints = {
.ext_nid = NID_name_constraints,
.ext_flags = 0,
.it = &NAME_CONSTRAINTS_it,
.ext_new = NULL,
.ext_free = NULL,
.d2i = NULL,
.i2d = NULL,
.i2s = NULL,
.s2i = NULL,
.i2v = NULL,
.v2i = v2i_NAME_CONSTRAINTS,
.i2r = i2r_NAME_CONSTRAINTS,
.r2i = NULL,
.usr_data = NULL,
};
static const ASN1_TEMPLATE GENERAL_SUBTREE_seq_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(GENERAL_SUBTREE, base),
.field_name = "base",
.item = &GENERAL_NAME_it,
},
{
.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
.tag = 0,
.offset = offsetof(GENERAL_SUBTREE, minimum),
.field_name = "minimum",
.item = &ASN1_INTEGER_it,
},
{
.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_OPTIONAL,
.tag = 1,
.offset = offsetof(GENERAL_SUBTREE, maximum),
.field_name = "maximum",
.item = &ASN1_INTEGER_it,
},
};
const ASN1_ITEM GENERAL_SUBTREE_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = GENERAL_SUBTREE_seq_tt,
.tcount = sizeof(GENERAL_SUBTREE_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = NULL,
.size = sizeof(GENERAL_SUBTREE),
.sname = "GENERAL_SUBTREE",
};
static const ASN1_TEMPLATE NAME_CONSTRAINTS_seq_tt[] = {
{
.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
.tag = 0,
.offset = offsetof(NAME_CONSTRAINTS, permittedSubtrees),
.field_name = "permittedSubtrees",
.item = &GENERAL_SUBTREE_it,
},
{
.flags = ASN1_TFLG_IMPLICIT | ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_OPTIONAL,
.tag = 1,
.offset = offsetof(NAME_CONSTRAINTS, excludedSubtrees),
.field_name = "excludedSubtrees",
.item = &GENERAL_SUBTREE_it,
},
};
const ASN1_ITEM NAME_CONSTRAINTS_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = NAME_CONSTRAINTS_seq_tt,
.tcount = sizeof(NAME_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = NULL,
.size = sizeof(NAME_CONSTRAINTS),
.sname = "NAME_CONSTRAINTS",
};
GENERAL_SUBTREE *
GENERAL_SUBTREE_new(void)
{
return (GENERAL_SUBTREE*)ASN1_item_new(&GENERAL_SUBTREE_it);
}
void
GENERAL_SUBTREE_free(GENERAL_SUBTREE *a)
{
ASN1_item_free((ASN1_VALUE *)a, &GENERAL_SUBTREE_it);
}
NAME_CONSTRAINTS *
NAME_CONSTRAINTS_new(void)
{
return (NAME_CONSTRAINTS*)ASN1_item_new(&NAME_CONSTRAINTS_it);
}
void
NAME_CONSTRAINTS_free(NAME_CONSTRAINTS *a)
{
ASN1_item_free((ASN1_VALUE *)a, &NAME_CONSTRAINTS_it);
}
static void *
v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
STACK_OF(CONF_VALUE) *nval)
{
int i;
CONF_VALUE tval, *val;
STACK_OF(GENERAL_SUBTREE) **ptree = NULL;
NAME_CONSTRAINTS *ncons = NULL;
GENERAL_SUBTREE *sub = NULL;
ncons = NAME_CONSTRAINTS_new();
if (!ncons)
goto memerr;
for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
val = sk_CONF_VALUE_value(nval, i);
if (!strncmp(val->name, "permitted", 9) && val->name[9]) {
ptree = &ncons->permittedSubtrees;
tval.name = val->name + 10;
} else if (!strncmp(val->name, "excluded", 8) && val->name[8]) {
ptree = &ncons->excludedSubtrees;
tval.name = val->name + 9;
} else {
X509V3error(X509V3_R_INVALID_SYNTAX);
goto err;
}
tval.value = val->value;
sub = GENERAL_SUBTREE_new();
if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1))
goto err;
if (!*ptree)
*ptree = sk_GENERAL_SUBTREE_new_null();
if (!*ptree || !sk_GENERAL_SUBTREE_push(*ptree, sub))
goto memerr;
sub = NULL;
}
return ncons;
memerr:
X509V3error(ERR_R_MALLOC_FAILURE);
err:
NAME_CONSTRAINTS_free(ncons);
GENERAL_SUBTREE_free(sub);
return NULL;
}
static int
i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a, BIO *bp, int ind)
{
NAME_CONSTRAINTS *ncons = a;
do_i2r_name_constraints(method, ncons->permittedSubtrees,
bp, ind, "Permitted");
do_i2r_name_constraints(method, ncons->excludedSubtrees,
bp, ind, "Excluded");
return 1;
}
static int
do_i2r_name_constraints(const X509V3_EXT_METHOD *method,
STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp, int ind, char *name)
{
GENERAL_SUBTREE *tree;
int i;
if (sk_GENERAL_SUBTREE_num(trees) > 0)
BIO_printf(bp, "%*s%s:\n", ind, "", name);
for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) {
tree = sk_GENERAL_SUBTREE_value(trees, i);
BIO_printf(bp, "%*s", ind + 2, "");
if (tree->base->type == GEN_IPADD)
print_nc_ipadd(bp, tree->base->d.ip);
else
GENERAL_NAME_print(bp, tree->base);
BIO_puts(bp, "\n");
}
return 1;
}
static int
print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
{
int i, len;
unsigned char *p;
p = ip->data;
len = ip->length;
BIO_puts(bp, "IP:");
if (len == 8) {
BIO_printf(bp, "%d.%d.%d.%d/%d.%d.%d.%d",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
} else if (len == 32) {
for (i = 0; i < 16; i++) {
BIO_printf(bp, "%X", p[0] << 8 | p[1]);
p += 2;
if (i == 7)
BIO_puts(bp, "/");
else if (i != 15)
BIO_puts(bp, ":");
}
} else
BIO_printf(bp, "IP Address:<invalid>");
return 1;
}
/* Check a certificate conforms to a specified set of constraints.
* Return values:
* X509_V_OK: All constraints obeyed.
* X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
* X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
* X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
* X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type.
* X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
* X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
*/
int
NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
{
int r, i;
X509_NAME *nm;
nm = X509_get_subject_name(x);
if (X509_NAME_entry_count(nm) > 0) {
GENERAL_NAME gntmp;
gntmp.type = GEN_DIRNAME;
gntmp.d.directoryName = nm;
r = nc_match(&gntmp, nc);
if (r != X509_V_OK)
return r;
gntmp.type = GEN_EMAIL;
/* Process any email address attributes in subject name */
for (i = -1;;) {
X509_NAME_ENTRY *ne;
i = X509_NAME_get_index_by_NID(nm,
NID_pkcs9_emailAddress, i);
if (i == -1)
break;
ne = X509_NAME_get_entry(nm, i);
gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
r = nc_match(&gntmp, nc);
if (r != X509_V_OK)
return r;
}
}
for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) {
GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
r = nc_match(gen, nc);
if (r != X509_V_OK)
return r;
}
return X509_V_OK;
}
static int
nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
{
GENERAL_SUBTREE *sub;
int i, r, match = 0;
/* Permitted subtrees: if any subtrees exist of matching the type
* at least one subtree must match.
*/
for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) {
sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
if (gen->type != sub->base->type)
continue;
if (sub->minimum || sub->maximum)
return X509_V_ERR_SUBTREE_MINMAX;
/* If we already have a match don't bother trying any more */
if (match == 2)
continue;
if (match == 0)
match = 1;
r = nc_match_single(gen, sub->base);
if (r == X509_V_OK)
match = 2;
else if (r != X509_V_ERR_PERMITTED_VIOLATION)
return r;
}
if (match == 1)
return X509_V_ERR_PERMITTED_VIOLATION;
/* Excluded subtrees: must not match any of these */
for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) {
sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
if (gen->type != sub->base->type)
continue;
if (sub->minimum || sub->maximum)
return X509_V_ERR_SUBTREE_MINMAX;
r = nc_match_single(gen, sub->base);
if (r == X509_V_OK)
return X509_V_ERR_EXCLUDED_VIOLATION;
else if (r != X509_V_ERR_PERMITTED_VIOLATION)
return r;
}
return X509_V_OK;
}
static int
nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
{
switch (base->type) {
case GEN_DIRNAME:
return nc_dn(gen->d.directoryName, base->d.directoryName);
case GEN_DNS:
return nc_dns(gen->d.dNSName, base->d.dNSName);
case GEN_EMAIL:
return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
case GEN_URI:
return nc_uri(gen->d.uniformResourceIdentifier,
base->d.uniformResourceIdentifier);
default:
return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
}
}
/* directoryName name constraint matching.
* The canonical encoding of X509_NAME makes this comparison easy. It is
* matched if the subtree is a subset of the name.
*/
static int
nc_dn(X509_NAME *nm, X509_NAME *base)
{
/* Ensure canonical encodings are up to date. */
if (nm->modified && i2d_X509_NAME(nm, NULL) < 0)
return X509_V_ERR_OUT_OF_MEM;
if (base->modified && i2d_X509_NAME(base, NULL) < 0)
return X509_V_ERR_OUT_OF_MEM;
if (base->canon_enclen > nm->canon_enclen)
return X509_V_ERR_PERMITTED_VIOLATION;
if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
return X509_V_ERR_PERMITTED_VIOLATION;
return X509_V_OK;
}
static int
nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
{
char *baseptr = (char *)base->data;
char *dnsptr = (char *)dns->data;
/* Empty matches everything */
if (!*baseptr)
return X509_V_OK;
/* Otherwise can add zero or more components on the left so
* compare RHS and if dns is longer and expect '.' as preceding
* character.
*/
if (dns->length > base->length) {
dnsptr += dns->length - base->length;
if (baseptr[0] != '.' && dnsptr[-1] != '.')
return X509_V_ERR_PERMITTED_VIOLATION;
}
if (strcasecmp(baseptr, dnsptr))
return X509_V_ERR_PERMITTED_VIOLATION;
return X509_V_OK;
}
static int
nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
{
const char *baseptr = (char *)base->data;
const char *emlptr = (char *)eml->data;
const char *baseat = strchr(baseptr, '@');
const char *emlat = strchr(emlptr, '@');
if (!emlat)
return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
/* Special case: inital '.' is RHS match */
if (!baseat && (*baseptr == '.')) {
if (eml->length > base->length) {
emlptr += eml->length - base->length;
if (!strcasecmp(baseptr, emlptr))
return X509_V_OK;
}
return X509_V_ERR_PERMITTED_VIOLATION;
}
/* If we have anything before '@' match local part */
if (baseat) {
if (baseat != baseptr) {
if ((baseat - baseptr) != (emlat - emlptr))
return X509_V_ERR_PERMITTED_VIOLATION;
/* Case sensitive match of local part */
if (strncmp(baseptr, emlptr, emlat - emlptr))
return X509_V_ERR_PERMITTED_VIOLATION;
}
/* Position base after '@' */
baseptr = baseat + 1;
}
emlptr = emlat + 1;
/* Just have hostname left to match: case insensitive */
if (strcasecmp(baseptr, emlptr))
return X509_V_ERR_PERMITTED_VIOLATION;
return X509_V_OK;
}
static int
nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
{
const char *baseptr = (char *)base->data;
const char *hostptr = (char *)uri->data;
const char *p = strchr(hostptr, ':');
int hostlen;
/* Check for foo:// and skip past it */
if (!p || (p[1] != '/') || (p[2] != '/'))
return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
hostptr = p + 3;
/* Determine length of hostname part of URI */
/* Look for a port indicator as end of hostname first */
p = strchr(hostptr, ':');
/* Otherwise look for trailing slash */
if (!p)
p = strchr(hostptr, '/');
if (!p)
hostlen = strlen(hostptr);
else
hostlen = p - hostptr;
if (hostlen == 0)
return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
/* Special case: inital '.' is RHS match */
if (*baseptr == '.') {
if (hostlen > base->length) {
p = hostptr + hostlen - base->length;
if (!strncasecmp(p, baseptr, base->length))
return X509_V_OK;
}
return X509_V_ERR_PERMITTED_VIOLATION;
}
if ((base->length != (int)hostlen) ||
strncasecmp(hostptr, baseptr, hostlen))
return X509_V_ERR_PERMITTED_VIOLATION;
return X509_V_OK;
}