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openssl/crypto/x509/x_name.c

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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "crypto/ctype.h"
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include "crypto/x509.h"
#include "crypto/asn1.h"
#include "x509_local.h"
/*
* Maximum length of X509_NAME: much larger than anything we should
* ever see in practice.
*/
#define X509_NAME_MAX (1024 * 1024)
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(const 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, const ASN1_STRING *in);
static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
unsigned char **in);
static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
int indent,
const char *fname, const ASN1_PCTX *pctx);
ASN1_SEQUENCE(X509_NAME_ENTRY) = {
ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
} ASN1_SEQUENCE_END(X509_NAME_ENTRY)
IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
/*
* For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
* declare two template wrappers for this
*/
ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
static_ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
static_ASN1_ITEM_TEMPLATE_END(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.
*/
static const ASN1_EXTERN_FUNCS x509_name_ff = {
NULL,
x509_name_ex_new,
x509_name_ex_free,
0, /* Default clear behaviour is OK */
x509_name_ex_d2i,
x509_name_ex_i2d,
x509_name_ex_print
};
IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
{
X509_NAME *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL)
goto memerr;
if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
goto memerr;
if ((ret->bytes = BUF_MEM_new()) == NULL)
goto memerr;
ret->modified = 1;
*val = (ASN1_VALUE *)ret;
return 1;
memerr:
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
if (ret) {
sk_X509_NAME_ENTRY_free(ret->entries);
OPENSSL_free(ret);
}
return 0;
}
static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
X509_NAME *a;
if (pval == NULL || *pval == NULL)
return;
a = (X509_NAME *)*pval;
BUF_MEM_free(a->bytes);
sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
OPENSSL_free(a->canon_enc);
OPENSSL_free(a);
*pval = NULL;
}
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_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;
if (len > X509_NAME_MAX)
len = X509_NAME_MAX;
q = p;
/* Get internal representation of Name */
ret = ASN1_item_ex_d2i(&intname.a,
&p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
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;
(void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
}
}
ret = x509_name_canon(nm.x);
if (!ret)
goto err;
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
local_sk_X509_NAME_ENTRY_free);
nm.x->modified = 0;
*val = nm.a;
*in = p;
return ret;
err:
if (nm.x != NULL)
X509_NAME_free(nm.x);
sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
local_sk_X509_NAME_ENTRY_pop_free);
ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
return 0;
}
static int x509_name_ex_i2d(const 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 int x509_name_encode(X509_NAME *a)
{
union {
STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
const 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)) {
sk_X509_NAME_ENTRY_free(entries);
goto memerr;
}
set = entry->set;
}
if (!sk_X509_NAME_ENTRY_push(entries, entry))
goto memerr;
}
len = ASN1_item_ex_i2d(&intname.a, NULL,
ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
if (!BUF_MEM_grow(a->bytes, len))
goto memerr;
p = (unsigned char *)a->bytes->data;
ASN1_item_ex_i2d(&intname.a,
&p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -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);
ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
return -1;
}
static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
int indent,
const char *fname, const ASN1_PCTX *pctx)
{
if (X509_NAME_print_ex(out, (const 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().
* NOTE: For empty X509_NAME (NULL-DN), canon_enclen == 0 && canon_enc == NULL
*/
static int x509_name_canon(X509_NAME *a)
{
unsigned char *p;
STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname;
STACK_OF(X509_NAME_ENTRY) *entries = NULL;
X509_NAME_ENTRY *entry, *tmpentry = NULL;
int i, set = -1, ret = 0, len;
OPENSSL_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 == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
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 == NULL)
goto err;
if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
sk_X509_NAME_ENTRY_free(entries);
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
goto err;
}
set = entry->set;
}
tmpentry = X509_NAME_ENTRY_new();
if (tmpentry == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
goto err;
}
tmpentry->object = OBJ_dup(entry->object);
if (tmpentry->object == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
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_MALLOC_FAILURE);
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) {
ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
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 l, i;
l = 80 - 2 - obase;
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;
}
l--;
}
if (*s == '\0')
break;
s++;
l--;
}
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;
}
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