int X509_verify_cert(X509_STORE_CTX *ctx)
{
- X509 *x, *xtmp, *chain_ss = NULL;
+ X509 *x, *xtmp, *xtmp2, *chain_ss = NULL;
int bad_chain = 0;
X509_VERIFY_PARAM *param = ctx->param;
int depth, i, ok = 0;
- int num;
+ int num, j, retry;
int (*cb) (int xok, X509_STORE_CTX *xctx);
STACK_OF(X509) *sktmp = NULL;
if (ctx->cert == NULL) {
break;
}
+ /* Remember how many untrusted certs we have */
+ j = num;
/*
* at this point, chain should contain a list of untrusted certificates.
* We now need to add at least one trusted one, if possible, otherwise we
* complain.
*/
- /*
- * Examine last certificate in chain and see if it is self signed.
- */
-
- i = sk_X509_num(ctx->chain);
- x = sk_X509_value(ctx->chain, i - 1);
- if (cert_self_signed(x)) {
- /* we have a self signed certificate */
- if (sk_X509_num(ctx->chain) == 1) {
- /*
- * We have a single self signed certificate: see if we can find
- * it in the store. We must have an exact match to avoid possible
- * impersonation.
- */
- ok = ctx->get_issuer(&xtmp, ctx, x);
- if ((ok <= 0) || X509_cmp(x, xtmp)) {
- ctx->error = X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
- ctx->current_cert = x;
- ctx->error_depth = i - 1;
- if (ok == 1)
- X509_free(xtmp);
- bad_chain = 1;
- ok = cb(0, ctx);
- if (!ok)
- goto end;
+ do {
+ /*
+ * Examine last certificate in chain and see if it is self signed.
+ */
+ i = sk_X509_num(ctx->chain);
+ x = sk_X509_value(ctx->chain, i - 1);
+ if (cert_self_signed(x)) {
+ /* we have a self signed certificate */
+ if (sk_X509_num(ctx->chain) == 1) {
+ /*
+ * We have a single self signed certificate: see if we can
+ * find it in the store. We must have an exact match to avoid
+ * possible impersonation.
+ */
+ ok = ctx->get_issuer(&xtmp, ctx, x);
+ if ((ok <= 0) || X509_cmp(x, xtmp)) {
+ ctx->error = X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
+ ctx->current_cert = x;
+ ctx->error_depth = i - 1;
+ if (ok == 1)
+ X509_free(xtmp);
+ bad_chain = 1;
+ ok = cb(0, ctx);
+ if (!ok)
+ goto end;
+ } else {
+ /*
+ * We have a match: replace certificate with store
+ * version so we get any trust settings.
+ */
+ X509_free(x);
+ x = xtmp;
+ (void)sk_X509_set(ctx->chain, i - 1, x);
+ ctx->last_untrusted = 0;
+ }
} else {
/*
- * We have a match: replace certificate with store version so
- * we get any trust settings.
+ * extract and save self signed certificate for later use
*/
- X509_free(x);
- x = xtmp;
- (void)sk_X509_set(ctx->chain, i - 1, x);
- ctx->last_untrusted = 0;
+ chain_ss = sk_X509_pop(ctx->chain);
+ ctx->last_untrusted--;
+ num--;
+ j--;
+ x = sk_X509_value(ctx->chain, num - 1);
}
- } else {
- /*
- * extract and save self signed certificate for later use
- */
- chain_ss = sk_X509_pop(ctx->chain);
- ctx->last_untrusted--;
- num--;
- x = sk_X509_value(ctx->chain, num - 1);
}
- }
-
- /* We now lookup certs from the certificate store */
- for (;;) {
- /* If we have enough, we break */
- if (depth < num)
- break;
+ /* We now lookup certs from the certificate store */
+ for (;;) {
+ /* If we have enough, we break */
+ if (depth < num)
+ break;
+ /* If we are self signed, we break */
+ if (cert_self_signed(x))
+ break;
+ ok = ctx->get_issuer(&xtmp, ctx, x);
- /* If we are self signed, we break */
- if (cert_self_signed(x))
- break;
+ if (ok < 0)
+ return ok;
+ if (ok == 0)
+ break;
+ x = xtmp;
+ if (!sk_X509_push(ctx->chain, x)) {
+ X509_free(xtmp);
+ X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ num++;
+ }
- ok = ctx->get_issuer(&xtmp, ctx, x);
+ /* we now have our chain, lets check it... */
+ i = check_trust(ctx);
- if (ok < 0)
- return ok;
- if (ok == 0)
- break;
+ /* If explicitly rejected error */
+ if (i == X509_TRUST_REJECTED)
+ goto end;
+ /*
+ * If it's not explicitly trusted then check if there is an alternative
+ * chain that could be used. We only do this if we haven't already
+ * checked via TRUSTED_FIRST and the user hasn't switched off alternate
+ * chain checking
+ */
+ retry = 0;
+ if (i != X509_TRUST_TRUSTED
+ && !(ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
+ && !(ctx->param->flags & X509_V_FLAG_NO_ALT_CHAINS)) {
+ while (j-- > 1) {
+ STACK_OF(X509) *chtmp = ctx->chain;
+ xtmp2 = sk_X509_value(ctx->chain, j - 1);
+ /*
+ * Temporarily set chain to NULL so we don't discount
+ * duplicates: the same certificate could be an untrusted
+ * CA found in the trusted store.
+ */
+ ctx->chain = NULL;
+ ok = ctx->get_issuer(&xtmp, ctx, xtmp2);
+ ctx->chain = chtmp;
+ if (ok < 0)
+ goto end;
+ /* Check if we found an alternate chain */
+ if (ok > 0) {
+ /*
+ * Free up the found cert we'll add it again later
+ */
+ X509_free(xtmp);
- x = xtmp;
- if (!sk_X509_push(ctx->chain, x)) {
- X509_free(xtmp);
- X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
- return 0;
+ /*
+ * Dump all the certs above this point - we've found an
+ * alternate chain
+ */
+ while (num > j) {
+ xtmp = sk_X509_pop(ctx->chain);
+ X509_free(xtmp);
+ num--;
+ ctx->last_untrusted--;
+ }
+ retry = 1;
+ break;
+ }
+ }
}
- num++;
- }
-
- /* we now have our chain, lets check it... */
-
- i = check_trust(ctx);
+ } while (retry);
- /* If explicitly rejected error */
- if (i == X509_TRUST_REJECTED)
- goto end;
/*
* If not explicitly trusted then indicate error unless it's a single
* self signed certificate in which case we've indicated an error already
}
if (!EVP_PKEY_missing_parameters(ktmp))
break;
- else {
- EVP_PKEY_free(ktmp);
- ktmp = NULL;
- }
+ EVP_PKEY_free(ktmp);
+ ktmp = NULL;
}
if (ktmp == NULL) {
X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,
X509_STORE_CTX *X509_STORE_CTX_new(void)
{
X509_STORE_CTX *ctx;
- ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
+
+ ctx = OPENSSL_malloc(sizeof(X509_STORE_CTX));
if (!ctx) {
X509err(X509_F_X509_STORE_CTX_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
projects / openssl.git / blobdiff