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/* $OpenBSD: x_name.c,v 1.43 2024/04/15 15:52:01 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <openssl/asn1t.h>
#include <openssl/err.h>
#include <openssl/x509.h>
#include "asn1_local.h"
#include "x509_local.h"
typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
DECLARE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in,
long len, const ASN1_ITEM *it, int tag, int aclass, char opt,
ASN1_TLC *ctx);
static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
const ASN1_ITEM *it, int tag, int aclass);
static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
static int x509_name_encode(X509_NAME *a);
static int x509_name_canon(X509_NAME *a);
static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname,
unsigned char **in);
static int x509_name_ex_print(BIO *out, ASN1_VALUE **pval, int indent,
const char *fname, const ASN1_PCTX *pctx);
static const ASN1_TEMPLATE X509_NAME_ENTRY_seq_tt[] = {
{
.offset = offsetof(X509_NAME_ENTRY, object),
.field_name = "object",
.item = &ASN1_OBJECT_it,
},
{
.offset = offsetof(X509_NAME_ENTRY, value),
.field_name = "value",
.item = &ASN1_PRINTABLE_it,
},
};
const ASN1_ITEM X509_NAME_ENTRY_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = X509_NAME_ENTRY_seq_tt,
.tcount = sizeof(X509_NAME_ENTRY_seq_tt) / sizeof(ASN1_TEMPLATE),
.size = sizeof(X509_NAME_ENTRY),
.sname = "X509_NAME_ENTRY",
};
X509_NAME_ENTRY *
d2i_X509_NAME_ENTRY(X509_NAME_ENTRY **a, const unsigned char **in, long len)
{
return (X509_NAME_ENTRY *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&X509_NAME_ENTRY_it);
}
LCRYPTO_ALIAS(d2i_X509_NAME_ENTRY);
int
i2d_X509_NAME_ENTRY(X509_NAME_ENTRY *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &X509_NAME_ENTRY_it);
}
LCRYPTO_ALIAS(i2d_X509_NAME_ENTRY);
X509_NAME_ENTRY *
X509_NAME_ENTRY_new(void)
{
return (X509_NAME_ENTRY *)ASN1_item_new(&X509_NAME_ENTRY_it);
}
LCRYPTO_ALIAS(X509_NAME_ENTRY_new);
void
X509_NAME_ENTRY_free(X509_NAME_ENTRY *a)
{
ASN1_item_free((ASN1_VALUE *)a, &X509_NAME_ENTRY_it);
}
LCRYPTO_ALIAS(X509_NAME_ENTRY_free);
X509_NAME_ENTRY *
X509_NAME_ENTRY_dup(X509_NAME_ENTRY *x)
{
return ASN1_item_dup(&X509_NAME_ENTRY_it, x);
}
LCRYPTO_ALIAS(X509_NAME_ENTRY_dup);
/* For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY }
* so declare two template wrappers for this
*/
static const ASN1_TEMPLATE X509_NAME_ENTRIES_item_tt = {
.flags = ASN1_TFLG_SET_OF,
.tag = 0,
.offset = 0,
.field_name = "RDNS",
.item = &X509_NAME_ENTRY_it,
};
static const ASN1_ITEM X509_NAME_ENTRIES_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = -1,
.templates = &X509_NAME_ENTRIES_item_tt,
.tcount = 0,
.funcs = NULL,
.size = 0,
.sname = "X509_NAME_ENTRIES",
};
static const ASN1_TEMPLATE X509_NAME_INTERNAL_item_tt = {
.flags = ASN1_TFLG_SEQUENCE_OF,
.tag = 0,
.offset = 0,
.field_name = "Name",
.item = &X509_NAME_ENTRIES_it,
};
static const ASN1_ITEM X509_NAME_INTERNAL_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = -1,
.templates = &X509_NAME_INTERNAL_item_tt,
.tcount = 0,
.funcs = NULL,
.size = 0,
.sname = "X509_NAME_INTERNAL",
};
/* Normally that's where it would end: we'd have two nested STACK structures
* representing the ASN1. Unfortunately X509_NAME uses a completely different
* form and caches encodings so we have to process the internal form and convert
* to the external form.
*/
const ASN1_EXTERN_FUNCS x509_name_ff = {
.app_data = NULL,
.asn1_ex_new = x509_name_ex_new,
.asn1_ex_free = x509_name_ex_free,
.asn1_ex_clear = NULL,
.asn1_ex_d2i = x509_name_ex_d2i,
.asn1_ex_i2d = x509_name_ex_i2d,
.asn1_ex_print = x509_name_ex_print,
};
const ASN1_ITEM X509_NAME_it = {
.itype = ASN1_ITYPE_EXTERN,
.utype = V_ASN1_SEQUENCE,
.templates = NULL,
.tcount = 0,
.funcs = &x509_name_ff,
.size = 0,
.sname = "X509_NAME",
};
X509_NAME *
d2i_X509_NAME(X509_NAME **a, const unsigned char **in, long len)
{
return (X509_NAME *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&X509_NAME_it);
}
LCRYPTO_ALIAS(d2i_X509_NAME);
int
i2d_X509_NAME(X509_NAME *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &X509_NAME_it);
}
LCRYPTO_ALIAS(i2d_X509_NAME);
X509_NAME *
X509_NAME_new(void)
{
return (X509_NAME *)ASN1_item_new(&X509_NAME_it);
}
LCRYPTO_ALIAS(X509_NAME_new);
void
X509_NAME_free(X509_NAME *a)
{
ASN1_item_free((ASN1_VALUE *)a, &X509_NAME_it);
}
LCRYPTO_ALIAS(X509_NAME_free);
X509_NAME *
X509_NAME_dup(X509_NAME *x)
{
return ASN1_item_dup(&X509_NAME_it, x);
}
LCRYPTO_ALIAS(X509_NAME_dup);
static int
x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
{
X509_NAME *ret = NULL;
ret = malloc(sizeof(X509_NAME));
if (!ret)
goto memerr;
if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
goto memerr;
if ((ret->bytes = BUF_MEM_new()) == NULL)
goto memerr;
ret->canon_enc = NULL;
ret->canon_enclen = 0;
ret->modified = 1;
*val = (ASN1_VALUE *)ret;
return 1;
memerr:
ASN1error(ERR_R_MALLOC_FAILURE);
if (ret) {
if (ret->entries)
sk_X509_NAME_ENTRY_free(ret->entries);
free(ret);
}
return 0;
}
static void
x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
X509_NAME *a;
if (!pval || !*pval)
return;
a = (X509_NAME *)*pval;
BUF_MEM_free(a->bytes);
sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
free(a->canon_enc);
free(a);
*pval = NULL;
}
static int
x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in, long len,
const ASN1_ITEM *it, int tag, int aclass, char opt, ASN1_TLC *ctx)
{
const unsigned char *p = *in, *q;
union {
STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
ASN1_VALUE *a;
} intname = {NULL};
union {
X509_NAME *x;
ASN1_VALUE *a;
} nm = {NULL};
int i, j, ret;
STACK_OF(X509_NAME_ENTRY) *entries;
X509_NAME_ENTRY *entry;
q = p;
/* Get internal representation of Name */
ret = ASN1_item_ex_d2i(&intname.a, &p, len,
&X509_NAME_INTERNAL_it, tag, aclass, opt, ctx);
if (ret <= 0)
return ret;
if (*val)
x509_name_ex_free(val, NULL);
if (!x509_name_ex_new(&nm.a, NULL))
goto err;
/* We've decoded it: now cache encoding */
if (!BUF_MEM_grow(nm.x->bytes, p - q))
goto err;
memcpy(nm.x->bytes->data, q, p - q);
/* Convert internal representation to X509_NAME structure */
for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
entry = sk_X509_NAME_ENTRY_value(entries, j);
entry->set = i;
if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
goto err;
}
sk_X509_NAME_ENTRY_free(entries);
}
sk_STACK_OF_X509_NAME_ENTRY_free(intname.s);
ret = x509_name_canon(nm.x);
if (!ret)
goto err;
nm.x->modified = 0;
*val = nm.a;
*in = p;
return ret;
err:
if (nm.x != NULL)
X509_NAME_free(nm.x);
ASN1error(ERR_R_NESTED_ASN1_ERROR);
return 0;
}
static int
x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out, const ASN1_ITEM *it,
int tag, int aclass)
{
int ret;
X509_NAME *a = (X509_NAME *)*val;
if (a->modified) {
ret = x509_name_encode(a);
if (ret < 0)
return ret;
ret = x509_name_canon(a);
if (ret < 0)
return ret;
}
ret = a->bytes->length;
if (out != NULL) {
memcpy(*out, a->bytes->data, ret);
*out += ret;
}
return ret;
}
static void
local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
{
sk_X509_NAME_ENTRY_free(ne);
}
static void
local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
{
sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
}
static int
x509_name_encode(X509_NAME *a)
{
union {
STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
ASN1_VALUE *a;
} intname = {NULL};
int len;
unsigned char *p;
STACK_OF(X509_NAME_ENTRY) *entries = NULL;
X509_NAME_ENTRY *entry;
int i, set = -1;
intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
if (!intname.s)
goto memerr;
for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
entry = sk_X509_NAME_ENTRY_value(a->entries, i);
if (entry->set != set) {
entries = sk_X509_NAME_ENTRY_new_null();
if (!entries)
goto memerr;
if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s,
entries))
goto memerr;
set = entry->set;
}
if (entries == NULL /* if entry->set is bogusly -1 */ ||
!sk_X509_NAME_ENTRY_push(entries, entry))
goto memerr;
}
len = ASN1_item_ex_i2d(&intname.a, NULL,
&X509_NAME_INTERNAL_it, -1, -1);
if (!BUF_MEM_grow(a->bytes, len))
goto memerr;
p = (unsigned char *)a->bytes->data;
ASN1_item_ex_i2d(&intname.a, &p, &X509_NAME_INTERNAL_it,
-1, -1);
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
local_sk_X509_NAME_ENTRY_free);
a->modified = 0;
return len;
memerr:
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
local_sk_X509_NAME_ENTRY_free);
ASN1error(ERR_R_MALLOC_FAILURE);
return -1;
}
static int
x509_name_ex_print(BIO *out, ASN1_VALUE **pval, int indent, const char *fname,
const ASN1_PCTX *pctx)
{
if (X509_NAME_print_ex(out, (X509_NAME *)*pval, indent,
pctx->nm_flags) <= 0)
return 0;
return 2;
}
/* This function generates the canonical encoding of the Name structure.
* In it all strings are converted to UTF8, leading, trailing and
* multiple spaces collapsed, converted to lower case and the leading
* SEQUENCE header removed.
*
* In future we could also normalize the UTF8 too.
*
* By doing this comparison of Name structures can be rapidly
* performed by just using memcmp() of the canonical encoding.
* By omitting the leading SEQUENCE name constraints of type
* dirName can also be checked with a simple memcmp().
*/
static int
x509_name_canon(X509_NAME *a)
{
unsigned char *p;
STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
STACK_OF(X509_NAME_ENTRY) *entries = NULL;
X509_NAME_ENTRY *entry, *tmpentry = NULL;
int i, len, set = -1, ret = 0;
if (a->canon_enc) {
free(a->canon_enc);
a->canon_enc = NULL;
}
/* Special case: empty X509_NAME => null encoding */
if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
a->canon_enclen = 0;
return 1;
}
intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
if (!intname)
goto err;
for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
entry = sk_X509_NAME_ENTRY_value(a->entries, i);
if (entry->set != set) {
entries = sk_X509_NAME_ENTRY_new_null();
if (!entries)
goto err;
if (sk_STACK_OF_X509_NAME_ENTRY_push(intname,
entries) == 0) {
sk_X509_NAME_ENTRY_free(entries);
goto err;
}
set = entry->set;
}
tmpentry = X509_NAME_ENTRY_new();
if (tmpentry == NULL)
goto err;
tmpentry->object = OBJ_dup(entry->object);
if (tmpentry->object == NULL)
goto err;
if (!asn1_string_canon(tmpentry->value, entry->value))
goto err;
if (entries == NULL /* if entry->set is bogusly -1 */ ||
!sk_X509_NAME_ENTRY_push(entries, tmpentry))
goto err;
tmpentry = NULL;
}
/* Finally generate encoding */
len = i2d_name_canon(intname, NULL);
if (len < 0)
goto err;
p = malloc(len);
if (p == NULL)
goto err;
a->canon_enc = p;
a->canon_enclen = len;
i2d_name_canon(intname, &p);
ret = 1;
err:
if (tmpentry)
X509_NAME_ENTRY_free(tmpentry);
if (intname)
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, 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
* isspace() and tolower() functions.
*/
/* Ignore leading spaces */
while ((len > 0) && !(*from & 0x80) && isspace(*from)) {
from++;
len--;
}
to = from + len - 1;
/* Ignore trailing spaces */
while ((len > 0) && !(*to & 0x80) && isspace(*to)) {
to--;
len--;
}
to = out->data;
i = 0;
while (i < len) {
/* If MSB set just copy across */
if (*from & 0x80) {
*to++ = *from++;
i++;
}
/* Collapse multiple spaces */
else if (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 (!(*from & 0x80) && isspace(*from));
} else {
*to++ = tolower(*from);
from++;
i++;
}
}
out->length = to - out->data;
return 1;
}
static int
i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *_intname, unsigned char **in)
{
int i, len, ltmp;
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,
&X509_NAME_ENTRIES_it, -1, -1);
if (ltmp < 0)
return ltmp;
len += ltmp;
}
return len;
}
int
X509_NAME_set(X509_NAME **xn, X509_NAME *name)
{
if (*xn == name)
return *xn != NULL;
if ((name = X509_NAME_dup(name)) == NULL)
return 0;
X509_NAME_free(*xn);
*xn = name;
return 1;
}
LCRYPTO_ALIAS(X509_NAME_set);
int
X509_NAME_get0_der(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;
}
LCRYPTO_ALIAS(X509_NAME_get0_der);
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