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openssl/ssl/ssl_cert.c
Rich Salz c0452248ea Ignore dups in X509_STORE_add_* 
X509_STORE_add_cert and X509_STORE_add_crl are changed to return
success if the object to be added was already found in the store, rather
than returning an error.

Raise errors if empty or malformed files are read when loading certificates
and CRLs.

Remove NULL checks and allow a segv to occur.
Add error handing for all calls to X509_STORE_add_c{ert|tl}

Refactor these two routines into one.

Bring the unit test for duplicate certificates up to date using the test
framework.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2830)
2017-04-20 15:33:42 -04:00

984 lines
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/*
* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECC cipher suite support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
#include <stdio.h>
#include "e_os.h"
#ifndef NO_SYS_TYPES_H
# include <sys/types.h>
#endif
#include "internal/o_dir.h"
#include <openssl/lhash.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include "ssl_locl.h"
#include "internal/thread_once.h"
static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
int op, int bits, int nid, void *other,
void *ex);
static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
static volatile int ssl_x509_store_ctx_idx = -1;
DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
{
ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
"SSL for verify callback",
NULL, NULL, NULL);
return ssl_x509_store_ctx_idx >= 0;
}
int SSL_get_ex_data_X509_STORE_CTX_idx(void)
{
if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
return -1;
return ssl_x509_store_ctx_idx;
}
CERT *ssl_cert_new(void)
{
CERT *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
ret->references = 1;
ret->sec_cb = ssl_security_default_callback;
ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
ret->sec_ex = NULL;
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
return ret;
}
CERT *ssl_cert_dup(CERT *cert)
{
CERT *ret = OPENSSL_zalloc(sizeof(*ret));
int i;
if (ret == NULL) {
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->references = 1;
ret->key = &ret->pkeys[cert->key - cert->pkeys];
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
#ifndef OPENSSL_NO_DH
if (cert->dh_tmp != NULL) {
ret->dh_tmp = cert->dh_tmp;
EVP_PKEY_up_ref(ret->dh_tmp);
}
ret->dh_tmp_cb = cert->dh_tmp_cb;
ret->dh_tmp_auto = cert->dh_tmp_auto;
#endif
for (i = 0; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = cert->pkeys + i;
CERT_PKEY *rpk = ret->pkeys + i;
if (cpk->x509 != NULL) {
rpk->x509 = cpk->x509;
X509_up_ref(rpk->x509);
}
if (cpk->privatekey != NULL) {
rpk->privatekey = cpk->privatekey;
EVP_PKEY_up_ref(cpk->privatekey);
}
if (cpk->chain) {
rpk->chain = X509_chain_up_ref(cpk->chain);
if (!rpk->chain) {
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (cert->pkeys[i].serverinfo != NULL) {
/* Just copy everything. */
ret->pkeys[i].serverinfo =
OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
if (ret->pkeys[i].serverinfo == NULL) {
SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
goto err;
}
ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
memcpy(ret->pkeys[i].serverinfo,
cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
}
}
/* Configured sigalgs copied across */
if (cert->conf_sigalgs) {
ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
* sizeof(*cert->conf_sigalgs));
if (ret->conf_sigalgs == NULL)
goto err;
memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
ret->conf_sigalgslen = cert->conf_sigalgslen;
} else
ret->conf_sigalgs = NULL;
if (cert->client_sigalgs) {
ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
* sizeof(*cert->client_sigalgs));
if (ret->client_sigalgs == NULL)
goto err;
memcpy(ret->client_sigalgs, cert->client_sigalgs,
cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
ret->client_sigalgslen = cert->client_sigalgslen;
} else
ret->client_sigalgs = NULL;
/* Shared sigalgs also NULL */
ret->shared_sigalgs = NULL;
/* Copy any custom client certificate types */
if (cert->ctype) {
ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
if (ret->ctype == NULL)
goto err;
ret->ctype_len = cert->ctype_len;
}
ret->cert_flags = cert->cert_flags;
ret->cert_cb = cert->cert_cb;
ret->cert_cb_arg = cert->cert_cb_arg;
if (cert->verify_store) {
X509_STORE_up_ref(cert->verify_store);
ret->verify_store = cert->verify_store;
}
if (cert->chain_store) {
X509_STORE_up_ref(cert->chain_store);
ret->chain_store = cert->chain_store;
}
ret->sec_cb = cert->sec_cb;
ret->sec_level = cert->sec_level;
ret->sec_ex = cert->sec_ex;
if (!custom_exts_copy(&ret->custext, &cert->custext))
goto err;
#ifndef OPENSSL_NO_PSK
if (cert->psk_identity_hint) {
ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
if (ret->psk_identity_hint == NULL)
goto err;
}
#endif
return ret;
err:
ssl_cert_free(ret);
return NULL;
}
/* Free up and clear all certificates and chains */
void ssl_cert_clear_certs(CERT *c)
{
int i;
if (c == NULL)
return;
for (i = 0; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = c->pkeys + i;
X509_free(cpk->x509);
cpk->x509 = NULL;
EVP_PKEY_free(cpk->privatekey);
cpk->privatekey = NULL;
sk_X509_pop_free(cpk->chain, X509_free);
cpk->chain = NULL;
OPENSSL_free(cpk->serverinfo);
cpk->serverinfo = NULL;
cpk->serverinfo_length = 0;
}
}
void ssl_cert_free(CERT *c)
{
int i;
if (c == NULL)
return;
CRYPTO_DOWN_REF(&c->references, &i, c->lock);
REF_PRINT_COUNT("CERT", c);
if (i > 0)
return;
REF_ASSERT_ISNT(i < 0);
#ifndef OPENSSL_NO_DH
EVP_PKEY_free(c->dh_tmp);
#endif
ssl_cert_clear_certs(c);
OPENSSL_free(c->conf_sigalgs);
OPENSSL_free(c->client_sigalgs);
OPENSSL_free(c->shared_sigalgs);
OPENSSL_free(c->ctype);
X509_STORE_free(c->verify_store);
X509_STORE_free(c->chain_store);
custom_exts_free(&c->custext);
#ifndef OPENSSL_NO_PSK
OPENSSL_free(c->psk_identity_hint);
#endif
CRYPTO_THREAD_lock_free(c->lock);
OPENSSL_free(c);
}
int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
{
int i, r;
CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
if (!cpk)
return 0;
for (i = 0; i < sk_X509_num(chain); i++) {
r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
if (r != 1) {
SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
return 0;
}
}
sk_X509_pop_free(cpk->chain, X509_free);
cpk->chain = chain;
return 1;
}
int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
{
STACK_OF(X509) *dchain;
if (!chain)
return ssl_cert_set0_chain(s, ctx, NULL);
dchain = X509_chain_up_ref(chain);
if (!dchain)
return 0;
if (!ssl_cert_set0_chain(s, ctx, dchain)) {
sk_X509_pop_free(dchain, X509_free);
return 0;
}
return 1;
}
int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
{
int r;
CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
if (!cpk)
return 0;
r = ssl_security_cert(s, ctx, x, 0, 0);
if (r != 1) {
SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
return 0;
}
if (!cpk->chain)
cpk->chain = sk_X509_new_null();
if (!cpk->chain || !sk_X509_push(cpk->chain, x))
return 0;
return 1;
}
int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
{
if (!ssl_cert_add0_chain_cert(s, ctx, x))
return 0;
X509_up_ref(x);
return 1;
}
int ssl_cert_select_current(CERT *c, X509 *x)
{
int i;
if (x == NULL)
return 0;
for (i = 0; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = c->pkeys + i;
if (cpk->x509 == x && cpk->privatekey) {
c->key = cpk;
return 1;
}
}
for (i = 0; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = c->pkeys + i;
if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
c->key = cpk;
return 1;
}
}
return 0;
}
int ssl_cert_set_current(CERT *c, long op)
{
int i, idx;
if (!c)
return 0;
if (op == SSL_CERT_SET_FIRST)
idx = 0;
else if (op == SSL_CERT_SET_NEXT) {
idx = (int)(c->key - c->pkeys + 1);
if (idx >= SSL_PKEY_NUM)
return 0;
} else
return 0;
for (i = idx; i < SSL_PKEY_NUM; i++) {
CERT_PKEY *cpk = c->pkeys + i;
if (cpk->x509 && cpk->privatekey) {
c->key = cpk;
return 1;
}
}
return 0;
}
void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
{
c->cert_cb = cb;
c->cert_cb_arg = arg;
}
int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
{
X509 *x;
int i = 0;
X509_STORE *verify_store;
X509_STORE_CTX *ctx = NULL;
X509_VERIFY_PARAM *param;
if ((sk == NULL) || (sk_X509_num(sk) == 0))
return 0;
if (s->cert->verify_store)
verify_store = s->cert->verify_store;
else
verify_store = s->ctx->cert_store;
ctx = X509_STORE_CTX_new();
if (ctx == NULL) {
SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
return 0;
}
x = sk_X509_value(sk, 0);
if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
goto end;
}
param = X509_STORE_CTX_get0_param(ctx);
/*
* XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
* point, for now a single @SECLEVEL sets the same policy for TLS crypto
* and PKI authentication.
*/
X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
/* Set suite B flags if needed */
X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
if (!X509_STORE_CTX_set_ex_data
(ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
goto end;
}
/* Verify via DANE if enabled */
if (DANETLS_ENABLED(&s->dane))
X509_STORE_CTX_set0_dane(ctx, &s->dane);
/*
* We need to inherit the verify parameters. These can be determined by
* the context: if its a server it will verify SSL client certificates or
* vice versa.
*/
X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
/*
* Anything non-default in "s->param" should overwrite anything in the ctx.
*/
X509_VERIFY_PARAM_set1(param, s->param);
if (s->verify_callback)
X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
if (s->ctx->app_verify_callback != NULL)
i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
else
i = X509_verify_cert(ctx);
s->verify_result = X509_STORE_CTX_get_error(ctx);
sk_X509_pop_free(s->verified_chain, X509_free);
s->verified_chain = NULL;
if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
if (s->verified_chain == NULL) {
SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
i = 0;
}
}
/* Move peername from the store context params to the SSL handle's */
X509_VERIFY_PARAM_move_peername(s->param, param);
end:
X509_STORE_CTX_free(ctx);
return i;
}
static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
STACK_OF(X509_NAME) *name_list)
{
sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
*ca_list = name_list;
}
STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
{
int i;
STACK_OF(X509_NAME) *ret;
X509_NAME *name;
ret = sk_X509_NAME_new_null();
if (ret == NULL) {
SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
return NULL;
}
for (i = 0; i < sk_X509_NAME_num(sk); i++) {
name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
if (name == NULL || !sk_X509_NAME_push(ret, name)) {
sk_X509_NAME_pop_free(ret, X509_NAME_free);
X509_NAME_free(name);
return NULL;
}
}
return (ret);
}
void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
{
set0_CA_list(&s->ca_names, name_list);
}
void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
{
set0_CA_list(&ctx->ca_names, name_list);
}
const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
{
return ctx->ca_names;
}
const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
{
return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
}
void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
{
SSL_CTX_set0_CA_list(ctx, name_list);
}
STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
{
return ctx->ca_names;
}
void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
{
SSL_set0_CA_list(s, name_list);
}
const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
{
return s->s3 != NULL ? s->s3->tmp.peer_ca_names : NULL;
}
STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
{
if (!s->server)
return s->s3 != NULL ? s->s3->tmp.peer_ca_names : NULL;
return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
}
static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
{
X509_NAME *name;
if (x == NULL)
return 0;
if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
return 0;
if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
return 0;
if (!sk_X509_NAME_push(*sk, name)) {
X509_NAME_free(name);
return 0;
}
return 1;
}
int SSL_add1_CA_list(SSL *ssl, const X509 *x)
{
return add_ca_name(&ssl->ca_names, x);
}
int SSL_CTX_add1_CA_list(SSL_CTX *ctx, const X509 *x)
{
return add_ca_name(&ctx->ca_names, x);
}
int SSL_add_client_CA(SSL *ssl, X509 *x)
{
return add_ca_name(&ssl->ca_names, x);
}
int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
{
return add_ca_name(&ctx->ca_names, x);
}
static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
return (X509_NAME_cmp(*a, *b));
}
static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
{
return X509_NAME_cmp(a, b);
}
static unsigned long xname_hash(const X509_NAME *a)
{
return X509_NAME_hash((X509_NAME *)a);
}
/**
* Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
* it doesn't really have anything to do with clients (except that a common use
* for a stack of CAs is to send it to the client). Actually, it doesn't have
* much to do with CAs, either, since it will load any old cert.
* \param file the file containing one or more certs.
* \return a ::STACK containing the certs.
*/
STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
{
BIO *in = BIO_new(BIO_s_file());
X509 *x = NULL;
X509_NAME *xn = NULL;
STACK_OF(X509_NAME) *ret = NULL;
LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
if ((name_hash == NULL) || (in == NULL)) {
SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!BIO_read_filename(in, file))
goto err;
for (;;) {
if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
break;
if (ret == NULL) {
ret = sk_X509_NAME_new_null();
if (ret == NULL) {
SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if ((xn = X509_get_subject_name(x)) == NULL)
goto err;
/* check for duplicates */
xn = X509_NAME_dup(xn);
if (xn == NULL)
goto err;
if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
/* Duplicate. */
X509_NAME_free(xn);
xn = NULL;
} else {
lh_X509_NAME_insert(name_hash, xn);
if (!sk_X509_NAME_push(ret, xn))
goto err;
}
}
goto done;
err:
X509_NAME_free(xn);
sk_X509_NAME_pop_free(ret, X509_NAME_free);
ret = NULL;
done:
BIO_free(in);
X509_free(x);
lh_X509_NAME_free(name_hash);
if (ret != NULL)
ERR_clear_error();
return (ret);
}
/**
* Add a file of certs to a stack.
* \param stack the stack to add to.
* \param file the file to add from. All certs in this file that are not
* already in the stack will be added.
* \return 1 for success, 0 for failure. Note that in the case of failure some
* certs may have been added to \c stack.
*/
int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
const char *file)
{
BIO *in;
X509 *x = NULL;
X509_NAME *xn = NULL;
int ret = 1;
int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
in = BIO_new(BIO_s_file());
if (in == NULL) {
SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!BIO_read_filename(in, file))
goto err;
for (;;) {
if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
break;
if ((xn = X509_get_subject_name(x)) == NULL)
goto err;
xn = X509_NAME_dup(xn);
if (xn == NULL)
goto err;
if (sk_X509_NAME_find(stack, xn) >= 0) {
/* Duplicate. */
X509_NAME_free(xn);
} else if (!sk_X509_NAME_push(stack, xn)) {
X509_NAME_free(xn);
goto err;
}
}
ERR_clear_error();
goto done;
err:
ret = 0;
done:
BIO_free(in);
X509_free(x);
(void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
return ret;
}
/**
* Add a directory of certs to a stack.
* \param stack the stack to append to.
* \param dir the directory to append from. All files in this directory will be
* examined as potential certs. Any that are acceptable to
* SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
* included.
* \return 1 for success, 0 for failure. Note that in the case of failure some
* certs may have been added to \c stack.
*/
int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
const char *dir)
{
OPENSSL_DIR_CTX *d = NULL;
const char *filename;
int ret = 0;
/* Note that a side effect is that the CAs will be sorted by name */
while ((filename = OPENSSL_DIR_read(&d, dir))) {
char buf[1024];
int r;
if (strlen(dir) + strlen(filename) + 2 > sizeof buf) {
SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
SSL_R_PATH_TOO_LONG);
goto err;
}
#ifdef OPENSSL_SYS_VMS
r = BIO_snprintf(buf, sizeof buf, "%s%s", dir, filename);
#else
r = BIO_snprintf(buf, sizeof buf, "%s/%s", dir, filename);
#endif
if (r <= 0 || r >= (int)sizeof(buf))
goto err;
if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
goto err;
}
if (errno) {
SYSerr(SYS_F_OPENDIR, get_last_sys_error());
ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
goto err;
}
ret = 1;
err:
if (d)
OPENSSL_DIR_end(&d);
return ret;
}
/* Build a certificate chain for current certificate */
int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
{
CERT *c = s ? s->cert : ctx->cert;
CERT_PKEY *cpk = c->key;
X509_STORE *chain_store = NULL;
X509_STORE_CTX *xs_ctx = NULL;
STACK_OF(X509) *chain = NULL, *untrusted = NULL;
X509 *x;
int i, rv = 0;
if (!cpk->x509) {
SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
goto err;
}
/* Rearranging and check the chain: add everything to a store */
if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
chain_store = X509_STORE_new();
if (chain_store == NULL)
goto err;
for (i = 0; i < sk_X509_num(cpk->chain); i++) {
x = sk_X509_value(cpk->chain, i);
if (!X509_STORE_add_cert(chain_store, x))
goto err;
}
/* Add EE cert too: it might be self signed */
if (!X509_STORE_add_cert(chain_store, cpk->x509))
goto err;
} else {
if (c->chain_store)
chain_store = c->chain_store;
else if (s)
chain_store = s->ctx->cert_store;
else
chain_store = ctx->cert_store;
if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
untrusted = cpk->chain;
}
xs_ctx = X509_STORE_CTX_new();
if (xs_ctx == NULL) {
SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
goto err;
}
/* Set suite B flags if needed */
X509_STORE_CTX_set_flags(xs_ctx,
c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
i = X509_verify_cert(xs_ctx);
if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
ERR_clear_error();
i = 1;
rv = 2;
}
if (i > 0)
chain = X509_STORE_CTX_get1_chain(xs_ctx);
if (i <= 0) {
SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
i = X509_STORE_CTX_get_error(xs_ctx);
ERR_add_error_data(2, "Verify error:",
X509_verify_cert_error_string(i));
goto err;
}
/* Remove EE certificate from chain */
x = sk_X509_shift(chain);
X509_free(x);
if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
if (sk_X509_num(chain) > 0) {
/* See if last cert is self signed */
x = sk_X509_value(chain, sk_X509_num(chain) - 1);
if (X509_get_extension_flags(x) & EXFLAG_SS) {
x = sk_X509_pop(chain);
X509_free(x);
}
}
}
/*
* Check security level of all CA certificates: EE will have been checked
* already.
*/
for (i = 0; i < sk_X509_num(chain); i++) {
x = sk_X509_value(chain, i);
rv = ssl_security_cert(s, ctx, x, 0, 0);
if (rv != 1) {
SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
sk_X509_pop_free(chain, X509_free);
rv = 0;
goto err;
}
}
sk_X509_pop_free(cpk->chain, X509_free);
cpk->chain = chain;
if (rv == 0)
rv = 1;
err:
if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
X509_STORE_free(chain_store);
X509_STORE_CTX_free(xs_ctx);
return rv;
}
int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
{
X509_STORE **pstore;
if (chain)
pstore = &c->chain_store;
else
pstore = &c->verify_store;
X509_STORE_free(*pstore);
*pstore = store;
if (ref && store)
X509_STORE_up_ref(store);
return 1;
}
static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
int op, int bits, int nid, void *other,
void *ex)
{
int level, minbits;
static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
if (ctx)
level = SSL_CTX_get_security_level(ctx);
else
level = SSL_get_security_level(s);
if (level <= 0) {
/*
* No EDH keys weaker than 1024-bits even at level 0, otherwise,
* anything goes.
*/
if (op == SSL_SECOP_TMP_DH && bits < 80)
return 0;
return 1;
}
if (level > 5)
level = 5;
minbits = minbits_table[level - 1];
switch (op) {
case SSL_SECOP_CIPHER_SUPPORTED:
case SSL_SECOP_CIPHER_SHARED:
case SSL_SECOP_CIPHER_CHECK:
{
const SSL_CIPHER *c = other;
/* No ciphers below security level */
if (bits < minbits)
return 0;
/* No unauthenticated ciphersuites */
if (c->algorithm_auth & SSL_aNULL)
return 0;
/* No MD5 mac ciphersuites */
if (c->algorithm_mac & SSL_MD5)
return 0;
/* SHA1 HMAC is 160 bits of security */
if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
return 0;
/* Level 2: no RC4 */
if (level >= 2 && c->algorithm_enc == SSL_RC4)
return 0;
/* Level 3: forward secure ciphersuites only */
if (level >= 3 && !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
return 0;
break;
}
case SSL_SECOP_VERSION:
if (!SSL_IS_DTLS(s)) {
/* SSLv3 not allowed at level 2 */
if (nid <= SSL3_VERSION && level >= 2)
return 0;
/* TLS v1.1 and above only for level 3 */
if (nid <= TLS1_VERSION && level >= 3)
return 0;
/* TLS v1.2 only for level 4 and above */
if (nid <= TLS1_1_VERSION && level >= 4)
return 0;
} else {
/* DTLS v1.2 only for level 4 and above */
if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
return 0;
}
break;
case SSL_SECOP_COMPRESSION:
if (level >= 2)
return 0;
break;
case SSL_SECOP_TICKET:
if (level >= 3)
return 0;
break;
default:
if (bits < minbits)
return 0;
}
return 1;
}
int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
{
return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
}
int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
{
return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
ctx->cert->sec_ex);
}
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