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openssl/crypto/x509/x509_cmp.c
Matt Caswell da1c088f59 Copyright year updates 
Reviewed-by: Richard Levitte <levitte@openssl.org>
Release: yes
2023-09-07 09:59:15 +01:00

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/*
* Copyright 1995-2023 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/asn1.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/core_names.h>
#include "crypto/x509.h"
int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
{
int i;
const X509_CINF *ai, *bi;
if (b == NULL)
return a != NULL;
if (a == NULL)
return -1;
ai = &a->cert_info;
bi = &b->cert_info;
i = ASN1_INTEGER_cmp(&ai->serialNumber, &bi->serialNumber);
if (i != 0)
return i < 0 ? -1 : 1;
return X509_NAME_cmp(ai->issuer, bi->issuer);
}
#ifndef OPENSSL_NO_MD5
unsigned long X509_issuer_and_serial_hash(X509 *a)
{
unsigned long ret = 0;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
unsigned char md[16];
char *f = NULL;
EVP_MD *digest = NULL;
if (ctx == NULL)
goto err;
f = X509_NAME_oneline(a->cert_info.issuer, NULL, 0);
if (f == NULL)
goto err;
digest = EVP_MD_fetch(a->libctx, SN_md5, a->propq);
if (digest == NULL)
goto err;
if (!EVP_DigestInit_ex(ctx, digest, NULL))
goto err;
if (!EVP_DigestUpdate(ctx, (unsigned char *)f, strlen(f)))
goto err;
if (!EVP_DigestUpdate
(ctx, (unsigned char *)a->cert_info.serialNumber.data,
(unsigned long)a->cert_info.serialNumber.length))
goto err;
if (!EVP_DigestFinal_ex(ctx, &(md[0]), NULL))
goto err;
ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
) & 0xffffffffL;
err:
OPENSSL_free(f);
EVP_MD_free(digest);
EVP_MD_CTX_free(ctx);
return ret;
}
#endif
int X509_issuer_name_cmp(const X509 *a, const X509 *b)
{
return X509_NAME_cmp(a->cert_info.issuer, b->cert_info.issuer);
}
int X509_subject_name_cmp(const X509 *a, const X509 *b)
{
return X509_NAME_cmp(a->cert_info.subject, b->cert_info.subject);
}
int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
{
return X509_NAME_cmp(a->crl.issuer, b->crl.issuer);
}
int X509_CRL_match(const X509_CRL *a, const X509_CRL *b)
{
int rv;
if ((a->flags & EXFLAG_NO_FINGERPRINT) == 0
&& (b->flags & EXFLAG_NO_FINGERPRINT) == 0)
rv = memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
else
return -2;
return rv < 0 ? -1 : rv > 0;
}
X509_NAME *X509_get_issuer_name(const X509 *a)
{
return a->cert_info.issuer;
}
unsigned long X509_issuer_name_hash(X509 *x)
{
return X509_NAME_hash_ex(x->cert_info.issuer, NULL, NULL, NULL);
}
#ifndef OPENSSL_NO_MD5
unsigned long X509_issuer_name_hash_old(X509 *x)
{
return X509_NAME_hash_old(x->cert_info.issuer);
}
#endif
X509_NAME *X509_get_subject_name(const X509 *a)
{
return a->cert_info.subject;
}
ASN1_INTEGER *X509_get_serialNumber(X509 *a)
{
return &a->cert_info.serialNumber;
}
const ASN1_INTEGER *X509_get0_serialNumber(const X509 *a)
{
return &a->cert_info.serialNumber;
}
unsigned long X509_subject_name_hash(X509 *x)
{
return X509_NAME_hash_ex(x->cert_info.subject, NULL, NULL, NULL);
}
#ifndef OPENSSL_NO_MD5
unsigned long X509_subject_name_hash_old(X509 *x)
{
return X509_NAME_hash_old(x->cert_info.subject);
}
#endif
/*
* Compare two certificates: they must be identical for this to work. NB:
* Although "cmp" operations are generally prototyped to take "const"
* arguments (eg. for use in STACKs), the way X509 handling is - these
* operations may involve ensuring the hashes are up-to-date and ensuring
* certain cert information is cached. So this is the point where the
* "depth-first" constification tree has to halt with an evil cast.
*/
int X509_cmp(const X509 *a, const X509 *b)
{
int rv = 0;
if (a == b) /* for efficiency */
return 0;
/* attempt to compute cert hash */
(void)X509_check_purpose((X509 *)a, -1, 0);
(void)X509_check_purpose((X509 *)b, -1, 0);
if ((a->ex_flags & EXFLAG_NO_FINGERPRINT) == 0
&& (b->ex_flags & EXFLAG_NO_FINGERPRINT) == 0)
rv = memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
if (rv != 0)
return rv < 0 ? -1 : 1;
/* Check for match against stored encoding too */
if (!a->cert_info.enc.modified && !b->cert_info.enc.modified) {
if (a->cert_info.enc.len < b->cert_info.enc.len)
return -1;
if (a->cert_info.enc.len > b->cert_info.enc.len)
return 1;
rv = memcmp(a->cert_info.enc.enc,
b->cert_info.enc.enc, a->cert_info.enc.len);
}
return rv < 0 ? -1 : rv > 0;
}
int ossl_x509_add_cert_new(STACK_OF(X509) **p_sk, X509 *cert, int flags)
{
if (*p_sk == NULL && (*p_sk = sk_X509_new_null()) == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
return 0;
}
return X509_add_cert(*p_sk, cert, flags);
}
int X509_add_cert(STACK_OF(X509) *sk, X509 *cert, int flags)
{
if (sk == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if ((flags & X509_ADD_FLAG_NO_DUP) != 0) {
/*
* not using sk_X509_set_cmp_func() and sk_X509_find()
* because this re-orders the certs on the stack
*/
int i;
for (i = 0; i < sk_X509_num(sk); i++) {
if (X509_cmp(sk_X509_value(sk, i), cert) == 0)
return 1;
}
}
if ((flags & X509_ADD_FLAG_NO_SS) != 0) {
int ret = X509_self_signed(cert, 0);
if (ret != 0)
return ret > 0 ? 1 : 0;
}
if (!sk_X509_insert(sk, cert,
(flags & X509_ADD_FLAG_PREPEND) != 0 ? 0 : -1)) {
ERR_raise(ERR_LIB_X509, ERR_R_CRYPTO_LIB);
return 0;
}
if ((flags & X509_ADD_FLAG_UP_REF) != 0)
(void)X509_up_ref(cert);
return 1;
}
int X509_add_certs(STACK_OF(X509) *sk, STACK_OF(X509) *certs, int flags)
/* compiler would allow 'const' for the certs, yet they may get up-ref'ed */
{
if (sk == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
return ossl_x509_add_certs_new(&sk, certs, flags);
}
int ossl_x509_add_certs_new(STACK_OF(X509) **p_sk, STACK_OF(X509) *certs,
int flags)
/* compiler would allow 'const' for the certs, yet they may get up-ref'ed */
{
int n = sk_X509_num(certs /* may be NULL */);
int i;
for (i = 0; i < n; i++) {
int j = (flags & X509_ADD_FLAG_PREPEND) == 0 ? i : n - 1 - i;
/* if prepend, add certs in reverse order to keep original order */
if (!ossl_x509_add_cert_new(p_sk, sk_X509_value(certs, j), flags))
return 0;
}
return 1;
}
int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
{
int ret;
if (b == NULL)
return a != NULL;
if (a == NULL)
return -1;
/* Ensure canonical encoding is present and up to date */
if (a->canon_enc == NULL || a->modified) {
ret = i2d_X509_NAME((X509_NAME *)a, NULL);
if (ret < 0)
return -2;
}
if (b->canon_enc == NULL || b->modified) {
ret = i2d_X509_NAME((X509_NAME *)b, NULL);
if (ret < 0)
return -2;
}
ret = a->canon_enclen - b->canon_enclen;
if (ret == 0 && a->canon_enclen == 0)
return 0;
if (ret == 0) {
if (a->canon_enc == NULL || b->canon_enc == NULL)
return -2;
ret = memcmp(a->canon_enc, b->canon_enc, a->canon_enclen);
}
return ret < 0 ? -1 : ret > 0;
}
unsigned long X509_NAME_hash_ex(const X509_NAME *x, OSSL_LIB_CTX *libctx,
const char *propq, int *ok)
{
unsigned long ret = 0;
unsigned char md[SHA_DIGEST_LENGTH];
EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
int i2d_ret;
/* Make sure X509_NAME structure contains valid cached encoding */
i2d_ret = i2d_X509_NAME(x, NULL);
if (ok != NULL)
*ok = 0;
if (i2d_ret >= 0 && sha1 != NULL
&& EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, sha1, NULL)) {
ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
) & 0xffffffffL;
if (ok != NULL)
*ok = 1;
}
EVP_MD_free(sha1);
return ret;
}
#ifndef OPENSSL_NO_MD5
/*
* I now DER encode the name and hash it. Since I cache the DER encoding,
* this is reasonably efficient.
*/
unsigned long X509_NAME_hash_old(const X509_NAME *x)
{
EVP_MD *md5 = EVP_MD_fetch(NULL, OSSL_DIGEST_NAME_MD5, "-fips");
EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
unsigned long ret = 0;
unsigned char md[16];
if (md5 == NULL || md_ctx == NULL)
goto end;
/* Make sure X509_NAME structure contains valid cached encoding */
if (i2d_X509_NAME(x, NULL) < 0)
goto end;
if (EVP_DigestInit_ex(md_ctx, md5, NULL)
&& EVP_DigestUpdate(md_ctx, x->bytes->data, x->bytes->length)
&& EVP_DigestFinal_ex(md_ctx, md, NULL))
ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |
((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)
) & 0xffffffffL;
end:
EVP_MD_CTX_free(md_ctx);
EVP_MD_free(md5);
return ret;
}
#endif
/* Search a stack of X509 for a match */
X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, const X509_NAME *name,
const ASN1_INTEGER *serial)
{
int i;
X509 x, *x509 = NULL;
if (!sk)
return NULL;
x.cert_info.serialNumber = *serial;
x.cert_info.issuer = (X509_NAME *)name; /* won't modify it */
for (i = 0; i < sk_X509_num(sk); i++) {
x509 = sk_X509_value(sk, i);
if (X509_issuer_and_serial_cmp(x509, &x) == 0)
return x509;
}
return NULL;
}
X509 *X509_find_by_subject(STACK_OF(X509) *sk, const X509_NAME *name)
{
X509 *x509;
int i;
for (i = 0; i < sk_X509_num(sk); i++) {
x509 = sk_X509_value(sk, i);
if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0)
return x509;
}
return NULL;
}
EVP_PKEY *X509_get0_pubkey(const X509 *x)
{
if (x == NULL)
return NULL;
return X509_PUBKEY_get0(x->cert_info.key);
}
EVP_PKEY *X509_get_pubkey(X509 *x)
{
if (x == NULL)
return NULL;
return X509_PUBKEY_get(x->cert_info.key);
}
int X509_check_private_key(const X509 *cert, const EVP_PKEY *pkey)
{
const EVP_PKEY *xk = X509_get0_pubkey(cert);
if (xk == NULL) {
ERR_raise(ERR_LIB_X509, X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
return 0;
}
return ossl_x509_check_private_key(xk, pkey);
}
int ossl_x509_check_private_key(const EVP_PKEY *x, const EVP_PKEY *pkey)
{
if (x == NULL) {
ERR_raise(ERR_LIB_X509, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
switch (EVP_PKEY_eq(x, pkey)) {
case 1:
return 1;
case 0:
ERR_raise(ERR_LIB_X509, X509_R_KEY_VALUES_MISMATCH);
return 0;
case -1:
ERR_raise(ERR_LIB_X509, X509_R_KEY_TYPE_MISMATCH);
return 0;
case -2:
ERR_raise(ERR_LIB_X509, X509_R_UNKNOWN_KEY_TYPE);
/* fall thru */
default:
return 0;
}
}
/*
* Check a suite B algorithm is permitted: pass in a public key and the NID
* of its signature (or 0 if no signature). The pflags is a pointer to a
* flags field which must contain the suite B verification flags.
*/
#ifndef OPENSSL_NO_EC
static int check_suite_b(EVP_PKEY *pkey, int sign_nid, unsigned long *pflags)
{
char curve_name[80];
size_t curve_name_len;
int curve_nid;
if (pkey == NULL || !EVP_PKEY_is_a(pkey, "EC"))
return X509_V_ERR_SUITE_B_INVALID_ALGORITHM;
if (!EVP_PKEY_get_group_name(pkey, curve_name, sizeof(curve_name),
&curve_name_len))
return X509_V_ERR_SUITE_B_INVALID_CURVE;
curve_nid = OBJ_txt2nid(curve_name);
/* Check curve is consistent with LOS */
if (curve_nid == NID_secp384r1) { /* P-384 */
/*
* Check signature algorithm is consistent with curve.
*/
if (sign_nid != -1 && sign_nid != NID_ecdsa_with_SHA384)
return X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM;
if (!(*pflags & X509_V_FLAG_SUITEB_192_LOS))
return X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED;
/* If we encounter P-384 we cannot use P-256 later */
*pflags &= ~X509_V_FLAG_SUITEB_128_LOS_ONLY;
} else if (curve_nid == NID_X9_62_prime256v1) { /* P-256 */
if (sign_nid != -1 && sign_nid != NID_ecdsa_with_SHA256)
return X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM;
if (!(*pflags & X509_V_FLAG_SUITEB_128_LOS_ONLY))
return X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED;
} else {
return X509_V_ERR_SUITE_B_INVALID_CURVE;
}
return X509_V_OK;
}
int X509_chain_check_suiteb(int *perror_depth, X509 *x, STACK_OF(X509) *chain,
unsigned long flags)
{
int rv, i, sign_nid;
EVP_PKEY *pk;
unsigned long tflags = flags;
if (!(flags & X509_V_FLAG_SUITEB_128_LOS))
return X509_V_OK;
/* If no EE certificate passed in must be first in chain */
if (x == NULL) {
x = sk_X509_value(chain, 0);
i = 1;
} else {
i = 0;
}
pk = X509_get0_pubkey(x);
/*
* With DANE-EE(3) success, or DANE-EE(3)/PKIX-EE(1) failure we don't build
* a chain all, just report trust success or failure, but must also report
* Suite-B errors if applicable. This is indicated via a NULL chain
* pointer. All we need to do is check the leaf key algorithm.
*/
if (chain == NULL)
return check_suite_b(pk, -1, &tflags);
if (X509_get_version(x) != X509_VERSION_3) {
rv = X509_V_ERR_SUITE_B_INVALID_VERSION;
/* Correct error depth */
i = 0;
goto end;
}
/* Check EE key only */
rv = check_suite_b(pk, -1, &tflags);
if (rv != X509_V_OK) {
/* Correct error depth */
i = 0;
goto end;
}
for (; i < sk_X509_num(chain); i++) {
sign_nid = X509_get_signature_nid(x);
x = sk_X509_value(chain, i);
if (X509_get_version(x) != X509_VERSION_3) {
rv = X509_V_ERR_SUITE_B_INVALID_VERSION;
goto end;
}
pk = X509_get0_pubkey(x);
rv = check_suite_b(pk, sign_nid, &tflags);
if (rv != X509_V_OK)
goto end;
}
/* Final check: root CA signature */
rv = check_suite_b(pk, X509_get_signature_nid(x), &tflags);
end:
if (rv != X509_V_OK) {
/* Invalid signature or LOS errors are for previous cert */
if ((rv == X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM
|| rv == X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED) && i)
i--;
/*
* If we have LOS error and flags changed then we are signing P-384
* with P-256. Use more meaningful error.
*/
if (rv == X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED && flags != tflags)
rv = X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256;
if (perror_depth)
*perror_depth = i;
}
return rv;
}
int X509_CRL_check_suiteb(X509_CRL *crl, EVP_PKEY *pk, unsigned long flags)
{
int sign_nid;
if (!(flags & X509_V_FLAG_SUITEB_128_LOS))
return X509_V_OK;
sign_nid = OBJ_obj2nid(crl->crl.sig_alg.algorithm);
return check_suite_b(pk, sign_nid, &flags);
}
#else
int X509_chain_check_suiteb(int *perror_depth, X509 *x, STACK_OF(X509) *chain,
unsigned long flags)
{
return 0;
}
int X509_CRL_check_suiteb(X509_CRL *crl, EVP_PKEY *pk, unsigned long flags)
{
return 0;
}
#endif
/*
* Not strictly speaking an "up_ref" as a STACK doesn't have a reference
* count but it has the same effect by duping the STACK and upping the ref of
* each X509 structure.
*/
STACK_OF(X509) *X509_chain_up_ref(STACK_OF(X509) *chain)
{
STACK_OF(X509) *ret = sk_X509_dup(chain);
int i;
if (ret == NULL)
return NULL;
for (i = 0; i < sk_X509_num(ret); i++) {
X509 *x = sk_X509_value(ret, i);
if (!X509_up_ref(x))
goto err;
}
return ret;
err:
while (i-- > 0)
X509_free(sk_X509_value(ret, i));
sk_X509_free(ret);
return NULL;
}
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