#include <stdio.h>
#include <time.h>
#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <openssl/crypto.h>
#include "cryptlib.h"
+#include <openssl/crypto.h>
#include <openssl/lhash.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
+#include <openssl/x509v3.h>
#include <openssl/objects.h>
static int null_callback(int ok,X509_STORE_CTX *e);
+static int check_chain_purpose(X509_STORE_CTX *ctx);
+static int check_trust(X509_STORE_CTX *ctx);
static int internal_verify(X509_STORE_CTX *ctx);
const char *X509_version="X.509" OPENSSL_VERSION_PTEXT;
ctx->last_untrusted=1;
}
- /* We use a temporary so we can chop and hack at it */
+ /* We use a temporary STACK so we can chop and hack at it */
if (ctx->untrusted != NULL
&& (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
{
i=sk_X509_num(ctx->chain);
x=sk_X509_value(ctx->chain,i-1);
- if (X509_NAME_cmp(X509_get_subject_name(x),X509_get_issuer_name(x))
+ xn = X509_get_subject_name(x);
+ if (X509_NAME_cmp(xn,X509_get_issuer_name(x))
== 0)
{
/* we have a self signed certificate */
if (sk_X509_num(ctx->chain) == 1)
{
- ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
- ctx->current_cert=x;
- ctx->error_depth=i-1;
- ok=cb(0,ctx);
- if (!ok) goto end;
+ /* 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=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
+ if ((ok != X509_LU_X509) || X509_cmp(x, obj.data.x509))
+ {
+ ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
+ ctx->current_cert=x;
+ ctx->error_depth=i-1;
+ if(ok == X509_LU_X509) X509_OBJECT_free_contents(&obj);
+ 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 = obj.data.x509;
+ sk_X509_set(ctx->chain, i - 1, x);
+ ctx->last_untrusted=0;
+ }
}
else
{
if (!ok) goto end;
}
+ /* We have the chain complete: now we need to check its purpose */
+ if(ctx->purpose > 0) ok = check_chain_purpose(ctx);
+
+ if(!ok) goto end;
+
+ /* The chain extensions are OK: check trust */
+
+ if(ctx->trust > 0) ok = check_trust(ctx);
+
+ if(!ok) goto end;
+
/* We may as well copy down any DSA parameters that are required */
X509_get_pubkey_parameters(NULL,ctx->chain);
return(ok);
}
+/* Check a certificate chains extensions for consistency
+ * with the supplied purpose
+ */
+
+static int check_chain_purpose(X509_STORE_CTX *ctx)
+{
+#ifdef NO_CHAIN_VERIFY
+ return 1;
+#else
+ int i, ok=0;
+ X509 *x;
+ int (*cb)();
+ cb=ctx->ctx->verify_cb;
+ if (cb == NULL) cb=null_callback;
+ /* Check all untrusted certificates */
+ for(i = 0; i < ctx->last_untrusted; i++) {
+ x = sk_X509_value(ctx->chain, i);
+ if(!X509_check_purpose(x, ctx->purpose, i)) {
+ if(i) ctx->error = X509_V_ERR_INVALID_CA;
+ else ctx->error = X509_V_ERR_INVALID_PURPOSE;
+ ctx->error_depth = i;
+ ctx->current_cert = x;
+ ok=cb(0,ctx);
+ if(!ok) goto end;
+ }
+ /* Check pathlen */
+ if((i > 1) && (x->ex_pathlen != -1)
+ && (i > (x->ex_pathlen + 1))) {
+ ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
+ ctx->error_depth = i;
+ ctx->current_cert = x;
+ ok=cb(0,ctx);
+ if(!ok) goto end;
+ }
+ }
+ ok = 1;
+ end:
+ return(ok);
+#endif
+}
+
+static int check_trust(X509_STORE_CTX *ctx)
+{
+#ifdef NO_CHAIN_VERIFY
+ return 1;
+#else
+ int i, ok;
+ X509 *x;
+ int (*cb)();
+ cb=ctx->ctx->verify_cb;
+ if (cb == NULL) cb=null_callback;
+/* For now just check the last certificate in the chain */
+ i = sk_X509_num(ctx->chain) - 1;
+ x = sk_X509_value(ctx->chain, i);
+ ok = X509_check_trust(x, ctx->trust, 0);
+ if(ok == X509_TRUST_TRUSTED) return 1;
+ ctx->error_depth = sk_X509_num(ctx->chain) - 1;
+ ctx->current_cert = x;
+ if(ok == X509_TRUST_REJECTED) ctx->error = X509_V_ERR_CERT_REJECTED;
+ else ctx->error = X509_V_ERR_CERT_UNTRUSTED;
+ ok = cb(0, ctx);
+ return(ok);
+#endif
+}
+
static int internal_verify(X509_STORE_CTX *ctx)
{
int i,ok=0,n;
ctx->untrusted=sk;
}
+int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
+ {
+ return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
+ }
+
+int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
+ {
+ return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
+ }
+
+/* This function is used to set the X509_STORE_CTX purpose and trust
+ * values. This is intended to be used when another structure has its
+ * own trust and purpose values which (if set) will be inherited by
+ * the ctx. If they aren't set then we will usually have a default
+ * purpose in mind which should then be used to set the trust value.
+ * An example of this is SSL use: an SSL structure will have its own
+ * purpose and trust settings which the application can set: if they
+ * aren't set then we use the default of SSL client/server.
+ */
+
+int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
+ int purpose, int trust)
+{
+ int idx;
+ /* If purpose not set use default */
+ if(!purpose) purpose = def_purpose;
+ /* If we have a purpose then check it is valid */
+ if(purpose) {
+ idx = X509_PURPOSE_get_by_id(purpose);
+ if(idx == -1) {
+ X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
+ X509_R_UNKNOWN_PURPOSE_ID);
+ return 0;
+ }
+ /* If trust not set then get from purpose default */
+ if(!trust) {
+ X509_PURPOSE *ptmp;
+ ptmp = X509_PURPOSE_iget(idx);
+ trust = ptmp->trust;
+ }
+ }
+ if(trust) {
+ idx = X509_TRUST_get_by_id(trust);
+ if(idx == -1) {
+ X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
+ X509_R_UNKNOWN_TRUST_ID);
+ return 0;
+ }
+ }
+
+ if(purpose) ctx->purpose = purpose;
+ if(trust) ctx->trust = trust;
+ return 1;
+}
+
+
IMPLEMENT_STACK_OF(X509)
IMPLEMENT_ASN1_SET_OF(X509)
projects / openssl.git / blobdiff