300 lines
8.8 KiB
C
300 lines
8.8 KiB
C
/*
|
|
* Copyright 1999-2023 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 "internal/cryptlib.h"
|
|
#include <openssl/x509v3.h>
|
|
#include "crypto/x509.h"
|
|
|
|
static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b);
|
|
static void trtable_free(X509_TRUST *p);
|
|
|
|
static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
|
|
static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
|
|
static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
|
|
|
|
static int obj_trust(int id, X509 *x, int flags);
|
|
static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;
|
|
|
|
/*
|
|
* WARNING: the following table should be kept in order of trust and without
|
|
* any gaps so we can just subtract the minimum trust value to get an index
|
|
* into the table
|
|
*/
|
|
|
|
static X509_TRUST trstandard[] = {
|
|
{X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
|
|
{X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth,
|
|
NULL},
|
|
{X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,
|
|
NULL},
|
|
{X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,
|
|
NULL},
|
|
{X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,
|
|
NULL},
|
|
{X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,
|
|
NULL},
|
|
{X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,
|
|
NULL},
|
|
{X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
|
|
};
|
|
|
|
#define X509_TRUST_COUNT OSSL_NELEM(trstandard)
|
|
|
|
static STACK_OF(X509_TRUST) *trtable = NULL;
|
|
|
|
static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)
|
|
{
|
|
return (*a)->trust - (*b)->trust;
|
|
}
|
|
|
|
int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
|
|
int) {
|
|
int (*oldtrust) (int, X509 *, int);
|
|
oldtrust = default_trust;
|
|
default_trust = trust;
|
|
return oldtrust;
|
|
}
|
|
|
|
/* Returns X509_TRUST_TRUSTED, X509_TRUST_REJECTED, or X509_TRUST_UNTRUSTED */
|
|
int X509_check_trust(X509 *x, int id, int flags)
|
|
{
|
|
X509_TRUST *pt;
|
|
int idx;
|
|
|
|
/* We get this as a default value */
|
|
if (id == X509_TRUST_DEFAULT)
|
|
return obj_trust(NID_anyExtendedKeyUsage, x,
|
|
flags | X509_TRUST_DO_SS_COMPAT);
|
|
idx = X509_TRUST_get_by_id(id);
|
|
if (idx < 0)
|
|
return default_trust(id, x, flags);
|
|
pt = X509_TRUST_get0(idx);
|
|
return pt->check_trust(pt, x, flags);
|
|
}
|
|
|
|
int X509_TRUST_get_count(void)
|
|
{
|
|
if (!trtable)
|
|
return X509_TRUST_COUNT;
|
|
return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
|
|
}
|
|
|
|
X509_TRUST *X509_TRUST_get0(int idx)
|
|
{
|
|
if (idx < 0)
|
|
return NULL;
|
|
if (idx < (int)X509_TRUST_COUNT)
|
|
return trstandard + idx;
|
|
return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
|
|
}
|
|
|
|
int X509_TRUST_get_by_id(int id)
|
|
{
|
|
X509_TRUST tmp;
|
|
int idx;
|
|
|
|
if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
|
|
return id - X509_TRUST_MIN;
|
|
if (trtable == NULL)
|
|
return -1;
|
|
tmp.trust = id;
|
|
/* Ideally, this would be done under lock */
|
|
sk_X509_TRUST_sort(trtable);
|
|
idx = sk_X509_TRUST_find(trtable, &tmp);
|
|
if (idx < 0)
|
|
return -1;
|
|
return idx + X509_TRUST_COUNT;
|
|
}
|
|
|
|
int X509_TRUST_set(int *t, int trust)
|
|
{
|
|
if (X509_TRUST_get_by_id(trust) < 0) {
|
|
ERR_raise(ERR_LIB_X509, X509_R_INVALID_TRUST);
|
|
return 0;
|
|
}
|
|
*t = trust;
|
|
return 1;
|
|
}
|
|
|
|
int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
|
|
const char *name, int arg1, void *arg2)
|
|
{
|
|
int idx;
|
|
X509_TRUST *trtmp;
|
|
/*
|
|
* This is set according to what we change: application can't set it
|
|
*/
|
|
flags &= ~X509_TRUST_DYNAMIC;
|
|
/* This will always be set for application modified trust entries */
|
|
flags |= X509_TRUST_DYNAMIC_NAME;
|
|
/* Get existing entry if any */
|
|
idx = X509_TRUST_get_by_id(id);
|
|
/* Need a new entry */
|
|
if (idx < 0) {
|
|
if ((trtmp = OPENSSL_malloc(sizeof(*trtmp))) == NULL)
|
|
return 0;
|
|
trtmp->flags = X509_TRUST_DYNAMIC;
|
|
} else
|
|
trtmp = X509_TRUST_get0(idx);
|
|
|
|
/* OPENSSL_free existing name if dynamic */
|
|
if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
|
|
OPENSSL_free(trtmp->name);
|
|
/* dup supplied name */
|
|
if ((trtmp->name = OPENSSL_strdup(name)) == NULL)
|
|
goto err;
|
|
/* Keep the dynamic flag of existing entry */
|
|
trtmp->flags &= X509_TRUST_DYNAMIC;
|
|
/* Set all other flags */
|
|
trtmp->flags |= flags;
|
|
|
|
trtmp->trust = id;
|
|
trtmp->check_trust = ck;
|
|
trtmp->arg1 = arg1;
|
|
trtmp->arg2 = arg2;
|
|
|
|
/* If its a new entry manage the dynamic table */
|
|
if (idx < 0) {
|
|
if (trtable == NULL
|
|
&& (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) {
|
|
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
|
|
goto err;
|
|
}
|
|
if (!sk_X509_TRUST_push(trtable, trtmp)) {
|
|
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
|
|
goto err;
|
|
}
|
|
}
|
|
return 1;
|
|
err:
|
|
if (idx < 0) {
|
|
OPENSSL_free(trtmp->name);
|
|
OPENSSL_free(trtmp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void trtable_free(X509_TRUST *p)
|
|
{
|
|
if (p == NULL)
|
|
return;
|
|
if (p->flags & X509_TRUST_DYNAMIC) {
|
|
if (p->flags & X509_TRUST_DYNAMIC_NAME)
|
|
OPENSSL_free(p->name);
|
|
OPENSSL_free(p);
|
|
}
|
|
}
|
|
|
|
void X509_TRUST_cleanup(void)
|
|
{
|
|
sk_X509_TRUST_pop_free(trtable, trtable_free);
|
|
trtable = NULL;
|
|
}
|
|
|
|
int X509_TRUST_get_flags(const X509_TRUST *xp)
|
|
{
|
|
return xp->flags;
|
|
}
|
|
|
|
char *X509_TRUST_get0_name(const X509_TRUST *xp)
|
|
{
|
|
return xp->name;
|
|
}
|
|
|
|
int X509_TRUST_get_trust(const X509_TRUST *xp)
|
|
{
|
|
return xp->trust;
|
|
}
|
|
|
|
static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
|
|
{
|
|
/*
|
|
* Declare the chain verified if the desired trust OID is not rejected in
|
|
* any auxiliary trust info for this certificate, and the OID is either
|
|
* expressly trusted, or else either "anyEKU" is trusted, or the
|
|
* certificate is self-signed and X509_TRUST_NO_SS_COMPAT is not set.
|
|
*/
|
|
flags |= X509_TRUST_DO_SS_COMPAT | X509_TRUST_OK_ANY_EKU;
|
|
return obj_trust(trust->arg1, x, flags);
|
|
}
|
|
|
|
static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
|
|
{
|
|
/*
|
|
* Declare the chain verified only if the desired trust OID is not
|
|
* rejected and is expressly trusted. Neither "anyEKU" nor "compat"
|
|
* trust in self-signed certificates apply.
|
|
*/
|
|
flags &= ~(X509_TRUST_DO_SS_COMPAT | X509_TRUST_OK_ANY_EKU);
|
|
return obj_trust(trust->arg1, x, flags);
|
|
}
|
|
|
|
static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
|
|
{
|
|
/* Call for side-effect of setting EXFLAG_SS for self-signed-certs */
|
|
if (X509_check_purpose(x, -1, 0) != 1)
|
|
return X509_TRUST_UNTRUSTED;
|
|
if ((flags & X509_TRUST_NO_SS_COMPAT) == 0 && (x->ex_flags & EXFLAG_SS))
|
|
return X509_TRUST_TRUSTED;
|
|
else
|
|
return X509_TRUST_UNTRUSTED;
|
|
}
|
|
|
|
static int obj_trust(int id, X509 *x, int flags)
|
|
{
|
|
X509_CERT_AUX *ax = x->aux;
|
|
int i;
|
|
|
|
if (ax != NULL && ax->reject != NULL) {
|
|
for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
|
|
ASN1_OBJECT *obj = sk_ASN1_OBJECT_value(ax->reject, i);
|
|
int nid = OBJ_obj2nid(obj);
|
|
|
|
if (nid == id || (nid == NID_anyExtendedKeyUsage &&
|
|
(flags & X509_TRUST_OK_ANY_EKU)))
|
|
return X509_TRUST_REJECTED;
|
|
}
|
|
}
|
|
|
|
if (ax != NULL && ax->trust != NULL) {
|
|
for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
|
|
ASN1_OBJECT *obj = sk_ASN1_OBJECT_value(ax->trust, i);
|
|
int nid = OBJ_obj2nid(obj);
|
|
|
|
if (nid == id || (nid == NID_anyExtendedKeyUsage &&
|
|
(flags & X509_TRUST_OK_ANY_EKU)))
|
|
return X509_TRUST_TRUSTED;
|
|
}
|
|
/*
|
|
* Reject when explicit trust EKU are set and none match.
|
|
*
|
|
* Returning untrusted is enough for full chains that end in
|
|
* self-signed roots, because when explicit trust is specified it
|
|
* suppresses the default blanket trust of self-signed objects.
|
|
*
|
|
* But for partial chains, this is not enough, because absent a similar
|
|
* trust-self-signed policy, non matching EKUs are indistinguishable
|
|
* from lack of EKU constraints.
|
|
*
|
|
* Therefore, failure to match any trusted purpose must trigger an
|
|
* explicit reject.
|
|
*/
|
|
return X509_TRUST_REJECTED;
|
|
}
|
|
|
|
if ((flags & X509_TRUST_DO_SS_COMPAT) == 0)
|
|
return X509_TRUST_UNTRUSTED;
|
|
|
|
/*
|
|
* Not rejected, and there is no list of accepted uses, try compat.
|
|
*/
|
|
return trust_compat(NULL, x, flags);
|
|
}
|