Reject calls to X509_verify_cert that have not been reinitialised

The function X509_verify_cert checks the value of |ctx->chain| at the
beginning, and if it is NULL then it initialises it, along with the value
of ctx->untrusted. The normal way to use X509_verify_cert() is to first
call X509_STORE_CTX_init(); then set up various parameters etc; then call
X509_verify_cert(); then check the results; and finally call
X509_STORE_CTX_cleanup(). The initial call to X509_STORE_CTX_init() sets
|ctx->chain| to NULL. The only place in the OpenSSL codebase  where
|ctx->chain| is set to anything other than a non NULL value is in
X509_verify_cert itself. Therefore the only ways that |ctx->chain| could be
non NULL on entry to X509_verify_cert is if one of the following occurs:
1) An application calls X509_verify_cert() twice without re-initialising
in between.
2) An application reaches inside the X509_STORE_CTX structure and changes
the value of |ctx->chain| directly.

With regards to the second of these, we should discount this - it should
not be supported to allow this.

With regards to the first of these, the documentation is not exactly
crystal clear, but the implication is that you must call
X509_STORE_CTX_init() before each call to X509_verify_cert(). If you fail
to do this then, at best, the results would be undefined.

Calling X509_verify_cert() with |ctx->chain| set to a non NULL value is
likely to have unexpected results, and could be dangerous. This commit
changes the behaviour of X509_verify_cert() so that it causes an error if
|ctx->chain| is anything other than NULL (because this indicates that we
have not been initialised properly). It also clarifies the associated
documentation. This is a follow up commit to CVE-2015-1793.

Reviewed-by: Stephen Henson <steve@openssl.org>

1 files changed, 14 insertions, 8 deletions

diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index 7a7fc59e77..7222113c68 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -193,6 +193,14 @@ int X509_verify_cert(X509_STORE_CTX *ctx)
         X509err(X509_F_X509_VERIFY_CERT, X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
         return -1;
     }
+    if (ctx->chain != NULL) {
+        /*
+         * This X509_STORE_CTX has already been used to verify a cert. We
+         * cannot do another one.
+         */
+        X509err(X509_F_X509_VERIFY_CERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+        return -1;
+    }
 
     cb = ctx->verify_cb;
 
@@ -200,15 +208,13 @@ int X509_verify_cert(X509_STORE_CTX *ctx)
      * first we make sure the chain we are going to build is present and that
      * the first entry is in place
      */
-    if (ctx->chain == NULL) {
-        if (((ctx->chain = sk_X509_new_null()) == NULL) ||
-            (!sk_X509_push(ctx->chain, ctx->cert))) {
-            X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
-            goto end;
-        }
-        CRYPTO_add(&ctx->cert->references, 1, CRYPTO_LOCK_X509);
-        ctx->last_untrusted = 1;
+    if (((ctx->chain = sk_X509_new_null()) == NULL) ||
+        (!sk_X509_push(ctx->chain, ctx->cert))) {
+        X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
+        goto end;
     }
+    CRYPTO_add(&ctx->cert->references, 1, CRYPTO_LOCK_X509);
+    ctx->last_untrusted = 1;
 
     /* We use a temporary STACK so we can chop and hack at it */
     if (ctx->untrusted != NULL