[openssl-commits] [openssl] master update

Matt Caswell matt at openssl.org
Thu Jul 9 13:01:12 UTC 2015


The branch master has been updated
       via  040b93353e8b48cfc0e2429d96eb3a27f259512d (commit)
       via  6f47ced0157059edee2d4c0d94fcf76e08763c5f (commit)
       via  7f3f41d816bb80e362a5978420f59030b3132c81 (commit)
       via  a64ba70dbb7e4886d7bae0b85a2a1070e22dd8fb (commit)
       via  79a55b1f2796bf6471360e8b6ab131cdedca256e (commit)
       via  aae41f8c54257d9fa6904d3a9aa09c5db6cefd0d (commit)
       via  593e9c638c58e1a510c519db0d024527113330f3 (commit)
       via  2aacec8f4a5ba1b365620a7b17fcce311ada93ad (commit)
      from  9cf315ef90d0cfeb8bb7a38873eea07a8f0dffec (commit)


- Log -----------------------------------------------------------------
commit 040b93353e8b48cfc0e2429d96eb3a27f259512d
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jul 9 09:45:22 2015 +0100

    Apply some missing updates from previous commits
    
    Reviewed-by: Stephen Henson <steve at openssl.org>

commit 6f47ced0157059edee2d4c0d94fcf76e08763c5f
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jul 2 15:38:32 2015 +0100

    Update CHANGES and NEWS for the new release
    
    Reviewed-by: Stephen Henson <steve at openssl.org>

commit 7f3f41d816bb80e362a5978420f59030b3132c81
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jun 25 12:28:28 2015 +0100

    Extend -show_chain option to verify to show more info
    
    The -show_chain flag to the verify command line app shows information about
    the chain that has been built. This commit adds the text "untrusted" against
    those certificates that have been used from the untrusted list.
    
    Reviewed-by: Rich Salz <rsalz at openssl.org>

commit a64ba70dbb7e4886d7bae0b85a2a1070e22dd8fb
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jun 25 12:27:05 2015 +0100

    Add help text for some verify options
    
    Fills in the help text for a number of options to verify that were blank.
    
    Reviewed-by: Rich Salz <rsalz at openssl.org>

commit 79a55b1f2796bf6471360e8b6ab131cdedca256e
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jun 25 12:34:38 2015 +0100

    Add documentation for some missing verify options
    
    Fills in a couple of verify options that were lacking documentation.
    
    Reviewed-by: Rich Salz <rsalz at openssl.org>

commit aae41f8c54257d9fa6904d3a9aa09c5db6cefd0d
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jun 25 09:47:15 2015 +0100

    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 at openssl.org>

commit 593e9c638c58e1a510c519db0d024527113330f3
Author: Matt Caswell <matt at openssl.org>
Date:   Thu Jul 2 00:15:56 2015 +0100

    Add test for CVE-2015-1793
    
    This adds a test for CVE-2015-1793. This adds a new test file
    verify_extra_test.c, which could form the basis for additional
    verification tests.
    
    Reviewed-by: Stephen Henson <steve at openssl.org>

commit 2aacec8f4a5ba1b365620a7b17fcce311ada93ad
Author: Matt Caswell <matt at openssl.org>
Date:   Wed Jun 24 15:55:36 2015 +0100

    Fix alternate chains certificate forgery issue
    
    During certificate verfification, OpenSSL will attempt to find an
    alternative certificate chain if the first attempt to build such a chain
    fails. An error in the implementation of this logic can mean that an
    attacker could cause certain checks on untrusted certificates to be
    bypassed, such as the CA flag, enabling them to use a valid leaf
    certificate to act as a CA and "issue" an invalid certificate.
    
    This occurs where at least one cert is added to the first chain from the
    trust store, but that chain still ends up being untrusted. In that case
    ctx->last_untrusted is decremented in error.
    
    Patch provided by the BoringSSL project.
    
    CVE-2015-1793
    
    Reviewed-by: Stephen Henson <steve at openssl.org>

-----------------------------------------------------------------------

Summary of changes:
 CHANGES                           |  24 ++++-
 NEWS                              |  10 +-
 apps/verify.c                     |  28 +++--
 crypto/x509/x509_vfy.c            |  29 ++++--
 doc/apps/verify.pod               |  20 +++-
 doc/crypto/X509_STORE_CTX_new.pod |  22 +++-
 doc/crypto/X509_verify_cert.pod   |   3 +-
 include/openssl/x509_vfy.h        |   1 +
 test/Makefile                     |  31 +++++-
 test/certs/bad.key                |  27 +++++
 test/certs/bad.pem                |  21 ++++
 test/certs/interCA.key            |  27 +++++
 test/certs/interCA.pem            |  21 ++++
 test/certs/leaf.key               |  27 +++++
 test/certs/leaf.pem               |  21 ++++
 test/certs/rootCA.key             |  27 +++++
 test/certs/rootCA.pem             |  21 ++++
 test/certs/roots.pem              |  42 ++++++++
 test/certs/subinterCA-ss.pem      |  21 ++++
 test/certs/subinterCA.key         |  27 +++++
 test/certs/subinterCA.pem         |  21 ++++
 test/certs/untrusted.pem          |  42 ++++++++
 test/verify_extra_test.c          | 208 ++++++++++++++++++++++++++++++++++++++
 util/libeay.num                   |   1 +
 24 files changed, 692 insertions(+), 30 deletions(-)
 create mode 100644 test/certs/bad.key
 create mode 100644 test/certs/bad.pem
 create mode 100644 test/certs/interCA.key
 create mode 100644 test/certs/interCA.pem
 create mode 100644 test/certs/leaf.key
 create mode 100644 test/certs/leaf.pem
 create mode 100644 test/certs/rootCA.key
 create mode 100644 test/certs/rootCA.pem
 create mode 100644 test/certs/roots.pem
 create mode 100644 test/certs/subinterCA-ss.pem
 create mode 100644 test/certs/subinterCA.key
 create mode 100644 test/certs/subinterCA.pem
 create mode 100644 test/certs/untrusted.pem
 create mode 100644 test/verify_extra_test.c

diff --git a/CHANGES b/CHANGES
index 057909e..4f0749d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -434,7 +434,29 @@
      whose return value is often ignored. 
      [Steve Henson]
 
- Changes between 1.0.2a and 1.0.2b [xx XXX xxxx]
+ Changes between 1.0.2c and 1.0.2d [xx XXX xxxx]
+
+  *) Alternate chains certificate forgery
+
+     During certificate verfification, OpenSSL will attempt to find an
+     alternative certificate chain if the first attempt to build such a chain
+     fails. An error in the implementation of this logic can mean that an
+     attacker could cause certain checks on untrusted certificates to be
+     bypassed, such as the CA flag, enabling them to use a valid leaf
+     certificate to act as a CA and "issue" an invalid certificate.
+
+     This issue was reported to OpenSSL by Adam Langley/David Benjamin
+     (Google/BoringSSL).
+     [Matt Caswell]
+
+ Changes between 1.0.2b and 1.0.2c [12 Jun 2015]
+
+  *) Fix HMAC ABI incompatibility. The previous version introduced an ABI
+     incompatibility in the handling of HMAC. The previous ABI has now been
+     restored.
+     [Matt Caswell]
+
+ Changes between 1.0.2a and 1.0.2b [11 Jun 2015]
 
   *) Malformed ECParameters causes infinite loop
 
diff --git a/NEWS b/NEWS
index beb2dd3..e51526e 100644
--- a/NEWS
+++ b/NEWS
@@ -5,7 +5,15 @@
   This file gives a brief overview of the major changes between each OpenSSL
   release. For more details please read the CHANGES file.
 
-  Major changes between OpenSSL 1.0.2a and OpenSSL 1.0.2b [under development]
+  Major changes between OpenSSL 1.0.2c and OpenSSL 1.0.2d [under development]
+
+      o Alternate chains certificate forgery (CVE-2015-1793)
+
+  Major changes between OpenSSL 1.0.2b and OpenSSL 1.0.2c [12 Jun 2015]
+
+      o Fix HMAC ABI incompatibility
+
+  Major changes between OpenSSL 1.0.2a and OpenSSL 1.0.2b [11 Jun 2015]
 
       o Malformed ECParameters causes infinite loop (CVE-2015-1788)
       o Exploitable out-of-bounds read in X509_cmp_time (CVE-2015-1789)
diff --git a/apps/verify.c b/apps/verify.c
index 227b85b..a823d58 100644
--- a/apps/verify.c
+++ b/apps/verify.c
@@ -83,14 +83,18 @@ OPTIONS verify_options[] = {
     {OPT_HELP_STR, 1, '-', "Usage: %s [options] cert.pem...\n"},
     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
     {"help", OPT_HELP, '-', "Display this summary"},
-    {"verbose", OPT_VERBOSE, '-'},
-    {"CApath", OPT_CAPATH, '/'},
-    {"CAfile", OPT_CAFILE, '<'},
-    {"untrusted", OPT_UNTRUSTED, '<'},
-    {"trusted", OPT_TRUSTED, '<'},
-    {"CRLfile", OPT_CRLFILE, '<'},
-    {"crl_download", OPT_CRL_DOWNLOAD, '-'},
-    {"show_chain", OPT_SHOW_CHAIN, '-'},
+    {"verbose", OPT_VERBOSE, '-',
+        "Print extra information about the operations being performed."},
+    {"CApath", OPT_CAPATH, '/', "A directory of trusted certificates"},
+    {"CAfile", OPT_CAFILE, '<', "A file of trusted certificates"},
+    {"untrusted", OPT_UNTRUSTED, '<', "A file of untrusted certificates"},
+    {"trusted", OPT_TRUSTED, '<', "A file of additional trusted certificates"},
+    {"CRLfile", OPT_CRLFILE, '<',
+        "File containing one or more CRL's (in PEM format) to load"},
+    {"crl_download", OPT_CRL_DOWNLOAD, '-',
+        "Attempt to download CRL information for this certificate"},
+    {"show_chain", OPT_SHOW_CHAIN, '-',
+        "Display information about the certificate chain"},
     OPT_V_OPTIONS,
 #ifndef OPENSSL_NO_ENGINE
     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
@@ -240,6 +244,7 @@ static int check(X509_STORE *ctx, char *file,
     int i = 0, ret = 0;
     X509_STORE_CTX *csc;
     STACK_OF(X509) *chain = NULL;
+    int num_untrusted;
 
     x = load_cert(file, FORMAT_PEM, NULL, e, "certificate file");
     if (x == NULL)
@@ -261,8 +266,10 @@ static int check(X509_STORE *ctx, char *file,
     if (crls)
         X509_STORE_CTX_set0_crls(csc, crls);
     i = X509_verify_cert(csc);
-    if (i > 0 && show_chain)
+    if (i > 0 && show_chain) {
         chain = X509_STORE_CTX_get1_chain(csc);
+        num_untrusted = X509_STORE_CTX_get_num_untrusted(csc);
+    }
     X509_STORE_CTX_free(csc);
 
     ret = 0;
@@ -280,6 +287,9 @@ static int check(X509_STORE *ctx, char *file,
             X509_NAME_print_ex_fp(stdout,
                                   X509_get_subject_name(cert),
                                   0, XN_FLAG_ONELINE);
+            if (i < num_untrusted) {
+                printf(" (untrusted)");
+            }
             printf("\n");
         }
         sk_X509_pop_free(chain, X509_free);
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index a920ea7..df012dd 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
@@ -392,8 +398,8 @@ int X509_verify_cert(X509_STORE_CTX *ctx)
                         xtmp = sk_X509_pop(ctx->chain);
                         X509_free(xtmp);
                         num--;
-                        ctx->last_untrusted--;
                     }
+                    ctx->last_untrusted = sk_X509_num(ctx->chain);
                     retry = 1;
                     break;
                 }
@@ -2446,6 +2452,11 @@ int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
     return ctx->explicit_policy;
 }
 
+int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx)
+{
+    return ctx->last_untrusted;
+}
+
 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
 {
     const X509_VERIFY_PARAM *param;
diff --git a/doc/apps/verify.pod b/doc/apps/verify.pod
index 9407fae..9cc7fcb 100644
--- a/doc/apps/verify.pod
+++ b/doc/apps/verify.pod
@@ -12,6 +12,7 @@ B<openssl> B<verify>
 [B<-attime timestamp>]
 [B<-check_ss_sig>]
 [B<-CRLfile file>]
+[B<-crl_download>]
 [B<-crl_check>]
 [B<-crl_check_all>]
 [B<-explicit_policy>]
@@ -32,6 +33,7 @@ B<openssl> B<verify>
 [B<-trusted_first>]
 [B<-no_alt_chains>]
 [B<-untrusted file>]
+[B<-trusted file>]
 [B<-use_deltas>]
 [B<-verbose>]
 [B<-verify_depth num>]
@@ -40,6 +42,7 @@ B<openssl> B<verify>
 [B<-verify_ip ip>]
 [B<-verify_name name>]
 [B<-x509_strict>]
+[B<-show_chain>]
 [B<->]
 [certificates]
 
@@ -80,6 +83,10 @@ because it doesn't add any security.
 
 File containing one or more CRL's (in PEM format) to load.
 
+=item B<-crl_download>
+
+Attempt to download CRL information for this certificate.
+
 =item B<-crl_check>
 
 Checks end entity certificate validity by attempting to look up a valid CRL.
@@ -178,6 +185,11 @@ behaviour to match that of OpenSSL versions prior to 1.1.0.
 A file of untrusted certificates. The file should contain multiple certificates
 in PEM format concatenated together.
 
+=item B<-trusted file>
+
+A file of additional trusted certificates. The file should contain multiple
+certificates in PEM format concatenated together.
+
 =item B<-use_deltas>
 
 Enable support for delta CRLs.
@@ -216,6 +228,12 @@ Supported usages include: default, pkcs7, smime_sign, ssl_client, ssl_server.
 For strict X.509 compliance, disable non-compliant workarounds for broken
 certificates.
 
+=item B<-show_chain>
+
+Display information about the certificate chain that has been built (if
+successful). Certificates in the chain that came from the untrusted list will be
+flagged as "untrusted".
+
 =item B<->
 
 Indicates the last option. All arguments following this are assumed to be
@@ -480,6 +498,6 @@ L<x509(1)|x509(1)>
 
 =head1 HISTORY
 
-The -no_alt_chains options was first added to OpenSSL 1.1.0.
+The -show_chain option was first added to OpenSSL 1.1.0.
 
 =cut
diff --git a/doc/crypto/X509_STORE_CTX_new.pod b/doc/crypto/X509_STORE_CTX_new.pod
index d8d3346..f8907d7 100644
--- a/doc/crypto/X509_STORE_CTX_new.pod
+++ b/doc/crypto/X509_STORE_CTX_new.pod
@@ -25,6 +25,8 @@ X509_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free, X509_STORE_CTX_
  void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
  int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
 
+ int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx);
+
 =head1 DESCRIPTION
 
 These functions initialise an B<X509_STORE_CTX> structure for subsequent use
@@ -40,10 +42,15 @@ is no longer valid.
 If B<ctx> is NULL nothing is done.
 
 X509_STORE_CTX_init() sets up B<ctx> for a subsequent verification operation.
-The trusted certificate store is set to B<store>, the end entity certificate
-to be verified is set to B<x509> and a set of additional certificates (which
-will be untrusted but may be used to build the chain) in B<chain>. Any or
-all of the B<store>, B<x509> and B<chain> parameters can be B<NULL>.
+It must be called before each call to X509_verify_cert(), i.e. a B<ctx> is only
+good for one call to X509_verify_cert(); if you want to verify a second
+certificate with the same B<ctx> then you must call X509_XTORE_CTX_cleanup()
+and then X509_STORE_CTX_init() again before the second call to
+X509_verify_cert(). The trusted certificate store is set to B<store>, the end
+entity certificate to be verified is set to B<x509> and a set of additional
+certificates (which will be untrusted but may be used to build the chain) in
+B<chain>. Any or all of the B<store>, B<x509> and B<chain> parameters can be
+B<NULL>.
 
 X509_STORE_CTX_trusted_stack() sets the set of trusted certificates of B<ctx>
 to B<sk>. This is an alternative way of specifying trusted certificates 
@@ -71,6 +78,9 @@ X509_STORE_CTX_set_default() looks up and sets the default verification
 method to B<name>. This uses the function X509_VERIFY_PARAM_lookup() to
 find an appropriate set of parameters from B<name>.
 
+X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates
+that were used in building the chain following a call to X509_verify_cert().
+
 =head1 NOTES
 
 The certificates and CRLs in a store are used internally and should B<not>
@@ -111,6 +121,9 @@ values.
 
 X509_STORE_CTX_set_default() returns 1 for success or 0 if an error occurred.
 
+X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates
+used.
+
 =head1 SEE ALSO
 
 L<X509_verify_cert(3)|X509_verify_cert(3)>
@@ -119,5 +132,6 @@ L<X509_VERIFY_PARAM_set_flags(3)|X509_VERIFY_PARAM_set_flags(3)>
 =head1 HISTORY
 
 X509_STORE_CTX_set0_crls() was first added to OpenSSL 1.0.0
+X509_STORE_CTX_get_num_untrusted() was first added to OpenSSL 1.1.0
 
 =cut
diff --git a/doc/crypto/X509_verify_cert.pod b/doc/crypto/X509_verify_cert.pod
index e5cfc6f..48055b0 100644
--- a/doc/crypto/X509_verify_cert.pod
+++ b/doc/crypto/X509_verify_cert.pod
@@ -32,7 +32,8 @@ OpenSSL internally for certificate validation, in both the S/MIME and
 SSL/TLS code.
 
 The negative return value from X509_verify_cert() can only occur if no
-certificate is set in B<ctx> (due to a programming error) or if a retry
+certificate is set in B<ctx> (due to a programming error); if X509_verify_cert()
+twice without reinitialising B<ctx> in between; or if a retry
 operation is requested during internal lookups (which never happens with
 standard lookup methods). It is however recommended that application check
 for <= 0 return value on error.
diff --git a/include/openssl/x509_vfy.h b/include/openssl/x509_vfy.h
index 4ad2029..8e0a225 100644
--- a/include/openssl/x509_vfy.h
+++ b/include/openssl/x509_vfy.h
@@ -528,6 +528,7 @@ void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
 
 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx);
 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx);
+int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx);
 
 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
diff --git a/test/Makefile b/test/Makefile
index 508c53b..d9aa750 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -68,6 +68,7 @@ SRPTEST=	srptest
 V3NAMETEST=	v3nametest
 HEARTBEATTEST=  heartbeat_test
 CONSTTIMETEST=  constant_time_test
+VERIFYEXTRATEST=	verify_extra_test
 
 TESTS=		alltests
 
@@ -84,7 +85,7 @@ EXE=	$(BNTEST)$(EXE_EXT) $(ECTEST)$(EXE_EXT)  $(ECDSATEST)$(EXE_EXT) $(ECDHTEST)
 	$(JPAKETEST)$(EXE_EXT) $(SECMEMTEST)$(EXE_EXT) \
 	$(SRPTEST)$(EXE_EXT) $(V3NAMETEST)$(EXE_EXT) \
 	$(HEARTBEATTEST)$(EXE_EXT) $(P5_CRPT2_TEST)$(EXE_EXT) \
-	$(CONSTTIMETEST)$(EXE_EXT)
+	$(CONSTTIMETEST)$(EXE_EXT) $(VERIFYEXTRATEST)$(EXE_EXT)
 
 # $(METHTEST)$(EXE_EXT)
 
@@ -98,7 +99,7 @@ OBJ=	$(BNTEST).o $(ECTEST).o  $(ECDSATEST).o $(ECDHTEST).o $(IDEATEST).o \
 	$(BFTEST).o  $(SSLTEST).o  $(DSATEST).o  $(EXPTEST).o $(RSATEST).o \
 	$(EVPTEST).o $(EVPEXTRATEST).o $(IGETEST).o $(JPAKETEST).o $(V3NAMETEST).o \
 	$(GOST2814789TEST).o $(HEARTBEATTEST).o $(P5_CRPT2_TEST).o \
-	$(CONSTTIMETEST).o testutil.o
+	$(CONSTTIMETEST).o $(VERIFYEXTRATEST).o testutil.o
 
 SRC=	$(BNTEST).c $(ECTEST).c  $(ECDSATEST).c $(ECDHTEST).c $(IDEATEST).c \
 	$(MD2TEST).c  $(MD4TEST).c $(MD5TEST).c \
@@ -109,7 +110,7 @@ SRC=	$(BNTEST).c $(ECTEST).c  $(ECDSATEST).c $(ECDHTEST).c $(IDEATEST).c \
 	$(BFTEST).c  $(SSLTEST).c $(DSATEST).c   $(EXPTEST).c $(RSATEST).c \
 	$(EVPTEST).c $(EVPEXTRATEST).c $(IGETEST).c $(JPAKETEST).c $(V3NAMETEST).c \
 	$(GOST2814789TEST).c $(HEARTBEATTEST).c $(P5_CRPT2_TEST).c \
-	$(CONSTTIMETEST).c testutil.c
+	$(CONSTTIMETEST).c $(VERIFYEXTRATEST).c testutil.c
 
 HEADER=	testutil.h
 
@@ -150,7 +151,7 @@ alltests: \
 	test_ige test_jpake test_secmem \
 	test_srp test_cms test_v3name test_ocsp \
 	test_gost2814789 test_heartbeat test_p5_crpt2 \
-	test_constant_time
+	test_constant_time test_verify_extra
 
 test_evp: $(EVPTEST)$(EXE_EXT) evptests.txt
 	@echo $(START) $@
@@ -399,6 +400,10 @@ test_constant_time: $(CONSTTIMETEST)$(EXE_EXT)
 	@echo $(START) $@
 	../util/shlib_wrap.sh ./$(CONSTTIMETEST)
 
+test_verify_extra: $(VERIFYEXTRATEST)$(EXE_EXT)
+	@echo $(START) $@
+	../util/shlib_wrap.sh ./$(VERIFYEXTRATEST)
+
 update: local_depend
 	@if [ -z "$(THIS)" ]; then $(MAKE) -f $(TOP)/Makefile reflect THIS=$@; fi
 
@@ -586,6 +591,9 @@ $(HEARTBEATTEST)$(EXE_EXT): $(HEARTBEATTEST).o $(DLIBCRYPTO) testutil.o
 $(CONSTTIMETEST)$(EXE_EXT): $(CONSTTIMETEST).o
 	@target=$(CONSTTIMETEST) $(BUILD_CMD)
 
+$(VERIFYEXTRATEST)$(EXE_EXT): $(VERIFYEXTRATEST).o
+	@target=$(VERIFYEXTRATEST) $(BUILD_CMD)
+
 #$(AESTEST).o: $(AESTEST).c
 #	$(CC) -c $(CFLAGS) -DINTERMEDIATE_VALUE_KAT -DTRACE_KAT_MCT $(AESTEST).c
 
@@ -881,6 +889,21 @@ v3nametest.o: ../include/openssl/sha.h ../include/openssl/stack.h
 v3nametest.o: ../include/openssl/symhacks.h ../include/openssl/x509.h
 v3nametest.o: ../include/openssl/x509_vfy.h ../include/openssl/x509v3.h
 v3nametest.o: v3nametest.c
+verify_extra_test.o: ../include/openssl/asn1.h ../include/openssl/bio.h
+verify_extra_test.o: ../include/openssl/buffer.h ../include/openssl/crypto.h
+verify_extra_test.o: ../include/openssl/e_os2.h ../include/openssl/ec.h
+verify_extra_test.o: ../include/openssl/ecdh.h ../include/openssl/ecdsa.h
+verify_extra_test.o: ../include/openssl/err.h ../include/openssl/evp.h
+verify_extra_test.o: ../include/openssl/lhash.h ../include/openssl/obj_mac.h
+verify_extra_test.o: ../include/openssl/objects.h
+verify_extra_test.o: ../include/openssl/opensslconf.h
+verify_extra_test.o: ../include/openssl/opensslv.h
+verify_extra_test.o: ../include/openssl/ossl_typ.h ../include/openssl/pem.h
+verify_extra_test.o: ../include/openssl/pem2.h ../include/openssl/pkcs7.h
+verify_extra_test.o: ../include/openssl/safestack.h ../include/openssl/sha.h
+verify_extra_test.o: ../include/openssl/stack.h ../include/openssl/symhacks.h
+verify_extra_test.o: ../include/openssl/x509.h ../include/openssl/x509_vfy.h
+verify_extra_test.o: verify_extra_test.c
 wp_test.o: ../include/openssl/crypto.h ../include/openssl/e_os2.h
 wp_test.o: ../include/openssl/opensslconf.h ../include/openssl/opensslv.h
 wp_test.o: ../include/openssl/ossl_typ.h ../include/openssl/safestack.h
diff --git a/test/certs/bad.key b/test/certs/bad.key
new file mode 100644
index 0000000..4708495
--- /dev/null
+++ b/test/certs/bad.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+kCI6KWQLCf2nRUjISa+cBAVLib88mMzrnROyHiA+psFGOrAuc/DSQ3lUxxKUT+HH
++G6I4XHQKE7Du2X+qGzs4QKBgBZyJNjRxWhF7rR5Dq4/RHsLM0yKqPPCoSkx2+ur
+WJjU47sofpVKUE4mzUaOumGnNicqk3nfkgw54HL6kTZpQ7JqUKt9pNGLBM+zI8qi
+njPec04MRmo7zjg1YKNmqDodXGl38QD7+5r/VRzO04fwgI8e5G98aiOhIuLezGHR
+R3GRAoGAAyhwtKoC87fSGrpyZQ16UAYuqNy0fVAQtrDgRgP5Nu4esr9QxS/hWjcR
+8s2P82wsR4gZna6l6vSz4awGVG4PGKnVjteAtZxok3nBHxPmRke5o7IpdObPjpQP
+RJNZYbJ9G/PbYDhciEoTjVyig6Ol5BRe9stSbO7+JIxEYr7VSpA=
+-----END RSA PRIVATE KEY-----
diff --git a/test/certs/bad.pem b/test/certs/bad.pem
new file mode 100644
index 0000000..8769231
--- /dev/null
+++ b/test/certs/bad.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDdzCCAl+gAwIBAgIJAJgwOOciuxjSMA0GCSqGSIb3DQEBCwUAMFQxCzAJBgNV
+BAYTAkFVMRMwEQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBX
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+ujkY1zkTP2rtVBGN4OyOfkE6enVKpt5lN6AqjEMhJ5i/yFM/jDndTrgd/JkAvyUJ
+O2ELtifCd8DeSYNA9Qm8/MEUYq1xXQrGJHCE
+-----END CERTIFICATE-----
diff --git a/test/certs/interCA.key b/test/certs/interCA.key
new file mode 100644
index 0000000..c32fe26
--- /dev/null
+++ b/test/certs/interCA.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEAu7NHo76UDp738A/nuEfvVkKL7a7Kjk8PJIYkRKouSZZgBW6Q
+xBWptfJ6UZLeoDnBjJ47hc7s+ohLkJnnsodAalgMKTIFjDLXhMyzgGqpBJf/ydvl
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+nTinsfyf4i48+IW55UFVU118nyufNeDdasoU6SSBH/MdeNq4hrTa
+-----END RSA PRIVATE KEY-----
diff --git a/test/certs/interCA.pem b/test/certs/interCA.pem
new file mode 100644
index 0000000..35568ab
--- /dev/null
+++ b/test/certs/interCA.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDgDCCAmigAwIBAgIJANnoWlLlEsTgMA0GCSqGSIb3DQEBCwUAMFYxCzAJBgNV
+BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
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+wjkiKKtwRBwU+5tCCagQZoeQ5dZXQThkiH2XEIOCOLxyD/tb
+-----END CERTIFICATE-----
diff --git a/test/certs/leaf.key b/test/certs/leaf.key
new file mode 100644
index 0000000..a1b1721
--- /dev/null
+++ b/test/certs/leaf.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAv0Qo9WC/BKA70LtQJdwVGSXqr9dut3cQmiFzTb/SaWldjOT1
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+-----END RSA PRIVATE KEY-----
diff --git a/test/certs/leaf.pem b/test/certs/leaf.pem
new file mode 100644
index 0000000..bb94d12
--- /dev/null
+++ b/test/certs/leaf.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
+MIIDfjCCAmagAwIBAgIJAKRNsDKacUqNMA0GCSqGSIb3DQEBCwUAMFoxCzAJBgNV
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+-----END CERTIFICATE-----
diff --git a/test/certs/rootCA.key b/test/certs/rootCA.key
new file mode 100644
index 0000000..527f3ad
--- /dev/null
+++ b/test/certs/rootCA.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
diff --git a/test/certs/rootCA.pem b/test/certs/rootCA.pem
new file mode 100644
index 0000000..ef73d00
--- /dev/null
+++ b/test/certs/rootCA.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/certs/roots.pem b/test/certs/roots.pem
new file mode 100644
index 0000000..0bc6912
--- /dev/null
+++ b/test/certs/roots.pem
@@ -0,0 +1,42 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/certs/subinterCA-ss.pem b/test/certs/subinterCA-ss.pem
new file mode 100644
index 0000000..a436b4b
--- /dev/null
+++ b/test/certs/subinterCA-ss.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/test/certs/subinterCA.key b/test/certs/subinterCA.key
new file mode 100644
index 0000000..c867af9
--- /dev/null
+++ b/test/certs/subinterCA.key
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
diff --git a/test/certs/subinterCA.pem b/test/certs/subinterCA.pem
new file mode 100644
index 0000000..2cdf480
--- /dev/null
+++ b/test/certs/subinterCA.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----
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+gUMG+CXxbF0kdCKZ9kQb1MJE4vOk6zfyBGQndmQnxHjt5botI/xpXg==
+-----END CERTIFICATE-----
diff --git a/test/certs/untrusted.pem b/test/certs/untrusted.pem
new file mode 100644
index 0000000..d93d312
--- /dev/null
+++ b/test/certs/untrusted.pem
@@ -0,0 +1,42 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/test/verify_extra_test.c b/test/verify_extra_test.c
new file mode 100644
index 0000000..08509f0
--- /dev/null
+++ b/test/verify_extra_test.c
@@ -0,0 +1,208 @@
+/*
+ * Written by Matt Caswell for the OpenSSL project.
+ */
+/* ====================================================================
+ * Copyright (c) 1998-2015 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core at openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay at cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh at cryptsoft.com).
+ *
+ */
+
+#include <stdio.h>
+#include <openssl/crypto.h>
+#include <openssl/bio.h>
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+#include <openssl/err.h>
+
+static STACK_OF(X509) *load_certs_from_file(const char *filename)
+{
+    STACK_OF(X509) *certs;
+    BIO *bio;
+    X509 *x;
+
+    bio = BIO_new_file(filename, "r");
+
+    if (bio == NULL) {
+        return NULL;
+    }
+
+    certs = sk_X509_new_null();
+    if (certs == NULL) {
+        BIO_free(bio);
+        return NULL;
+    }
+
+    ERR_set_mark();
+    do {
+        x = PEM_read_bio_X509(bio, NULL, 0, NULL);
+        if (x != NULL && !sk_X509_push(certs, x)) {
+            sk_X509_pop_free(certs, X509_free);
+            BIO_free(bio);
+            return NULL;
+        } else if (x == NULL) {
+            /*
+             * We probably just ran out of certs, so ignore any errors
+             * generated
+             */
+            ERR_pop_to_mark();
+        }
+    } while (x != NULL);
+
+    BIO_free(bio);
+
+    return certs;
+}
+
+/*
+ * Test for CVE-2015-1793 (Alternate Chains Certificate Forgery)
+ *
+ * Chain is as follows:
+ *
+ * rootCA (self-signed)
+ *   |
+ * interCA
+ *   |
+ * subinterCA       subinterCA (self-signed)
+ *   |                   |
+ * leaf ------------------
+ *   |
+ * bad
+ *
+ * rootCA, interCA, subinterCA, subinterCA (ss) all have CA=TRUE
+ * leaf and bad have CA=FALSE
+ *
+ * subinterCA and subinterCA (ss) have the same subject name and keys
+ *
+ * interCA (but not rootCA) and subinterCA (ss) are in the trusted store
+ * (roots.pem)
+ * leaf and subinterCA are in the untrusted list (untrusted.pem)
+ * bad is the certificate being verified (bad.pem)
+ *
+ * Versions vulnerable to CVE-2015-1793 will fail to detect that leaf has
+ * CA=FALSE, and will therefore incorrectly verify bad
+ *
+ */
+static int test_alt_chains_cert_forgery(void)
+{
+    int ret = 0;
+    int i;
+    X509 *x = NULL;
+    STACK_OF(X509) *untrusted = NULL;
+    BIO *bio = NULL;
+    X509_STORE_CTX *sctx = NULL;
+    X509_STORE *store = NULL;
+    X509_LOOKUP *lookup = NULL;
+
+    store = X509_STORE_new();
+    if (store == NULL)
+        goto err;
+
+    lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
+    if (lookup == NULL)
+        goto err;
+    if(!X509_LOOKUP_load_file(lookup, "certs/roots.pem", X509_FILETYPE_PEM))
+        goto err;
+
+    untrusted = load_certs_from_file("certs/untrusted.pem");
+
+    if ((bio = BIO_new_file("certs/bad.pem", "r")) == NULL)
+        goto err;
+
+    if((x = PEM_read_bio_X509(bio, NULL, 0, NULL)) == NULL)
+        goto err;
+
+    sctx = X509_STORE_CTX_new();
+    if (sctx == NULL)
+        goto err;
+
+    if (!X509_STORE_CTX_init(sctx, store, x, untrusted))
+        goto err;
+
+    i = X509_verify_cert(sctx);
+
+    if(i == 0 && X509_STORE_CTX_get_error(sctx) == X509_V_ERR_INVALID_CA) {
+        /* This is the result we were expecting: Test passed */
+        ret = 1;
+    }
+ err:
+    X509_STORE_CTX_free(sctx);
+    X509_free(x);
+    BIO_free(bio);
+    sk_X509_pop_free(untrusted, X509_free);
+    X509_STORE_free(store);
+    if (ret != 1)
+        ERR_print_errors_fp(stderr);
+    return ret;
+}
+
+int main(void)
+{
+    CRYPTO_malloc_debug_init();
+    CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
+    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
+
+    ERR_load_crypto_strings();
+    OpenSSL_add_all_digests();
+
+    if (!test_alt_chains_cert_forgery()) {
+        fprintf(stderr, "Test alt chains cert forgery failed\n");
+        return 1;
+    }
+
+    EVP_cleanup();
+    CRYPTO_cleanup_all_ex_data();
+    ERR_remove_thread_state(NULL);
+    ERR_free_strings();
+    CRYPTO_mem_leaks_fp(stderr);
+
+    printf("PASS\n");
+    return 0;
+}
diff --git a/util/libeay.num b/util/libeay.num
index 9933499..4d3642f 100755
--- a/util/libeay.num
+++ b/util/libeay.num
@@ -4587,3 +4587,4 @@ CRYPTO_secure_free                      4945	EXIST::FUNCTION:
 BIO_s_secmem                            4946	EXIST::FUNCTION:
 CRYPTO_get_secure_mem_ex_functions      4947	EXIST::FUNCTION:
 CRYPTO_set_secure_mem_functions         4948	EXIST::FUNCTION:
+X509_STORE_CTX_get_num_untrusted        4949	EXIST::FUNCTION:


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