Merge branch 'iotssl-515-max-pathlen' into development

* iotssl-515-max-pathlen:
  Add Changelog entries for this branch
  Fix a style issue
  Fix whitespace at EOL issues
  Use symbolic constants in test data
  Fixed pathlen contraint enforcement.
  Additional corner cases for testing pathlen constrains. Just in case.
  Added test case for pathlen constrains in intermediate certificates

ChangeLog

@@ -2,6 +2,11 @@ mbed TLS ChangeLog (Sorted per branch, date)
 
 = mbed TLS 2.2.0 released 2015-10-xx
 
+Security
+   * The X509 max_pathlen constraint was not enforced on intermediate
+     certificates. Found by Nicholas Wilson, fix and tests provided by
+     Janos Follath. #280 and #319
+
 Features
    * Experimental support for EC J-PAKE as defined in Thread 1.0.0.
      Disabled by default as the specification might still change.
@@ -9,6 +14,9 @@ Features
      block. (Potential uses include EAP-TLS and Thread.)
 
 Bugfix
+   * Self-signed certificates were not excluded from pathlen counting,
+     resulting in some valid X.509 being incorrectly rejected. Found and fix
+     provided by Janos Follath. #319
    * Fix build error with configurations where ECDHE-PSK is the only key
      exchange. Found and fix provided by Chris Hammond. #270
    * Fix build error with configurations where RSA, RSA-PSK, ECDH-RSA or

library/x509_crt.c

@@ -1877,7 +1877,7 @@ static int x509_crt_verify_top(
                 mbedtls_x509_crt *child, mbedtls_x509_crt *trust_ca,
                 mbedtls_x509_crl *ca_crl,
                 const mbedtls_x509_crt_profile *profile,
-                int path_cnt, uint32_t *flags,
+                int path_cnt, int self_cnt, uint32_t *flags,
                 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
                 void *p_vrfy )
 {
@@ -1933,8 +1933,9 @@ static int x509_crt_verify_top(
             check_path_cnt--;
         }
 
+        /* Self signed certificates do not count towards the limit */
         if( trust_ca->max_pathlen > 0 &&
-            trust_ca->max_pathlen < check_path_cnt )
+            trust_ca->max_pathlen < check_path_cnt - self_cnt )
         {
             continue;
         }
@@ -2006,7 +2007,7 @@ static int x509_crt_verify_child(
                 mbedtls_x509_crt *child, mbedtls_x509_crt *parent,
                 mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl,
                 const mbedtls_x509_crt_profile *profile,
-                int path_cnt, uint32_t *flags,
+                int path_cnt, int self_cnt, uint32_t *flags,
                 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
                 void *p_vrfy )
 {
@@ -2016,6 +2017,10 @@ static int x509_crt_verify_child(
     mbedtls_x509_crt *grandparent;
     const mbedtls_md_info_t *md_info;
 
+    /* Counting intermediate self signed certificates */
+    if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 )
+        self_cnt++;
+
     /* path_cnt is 0 for the first intermediate CA */
     if( 1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
     {
@@ -2076,7 +2081,7 @@ static int x509_crt_verify_child(
     if( grandparent != NULL )
     {
         ret = x509_crt_verify_top( parent, grandparent, ca_crl, profile,
-                                path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
+                                path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
@@ -2087,6 +2092,15 @@ static int x509_crt_verify_child(
              grandparent != NULL;
              grandparent = grandparent->next )
         {
+            /* +2 because the current step is not yet accounted for
+             * and because max_pathlen is one higher than it should be.
+             * Also self signed certificates do not count to the limit. */
+            if( grandparent->max_pathlen > 0 &&
+                grandparent->max_pathlen < 2 + path_cnt - self_cnt )
+            {
+                continue;
+            }
+
             if( x509_crt_check_parent( parent, grandparent,
                                        0, path_cnt == 0 ) == 0 )
                 break;
@@ -2096,7 +2110,7 @@ static int x509_crt_verify_child(
         if( grandparent != NULL )
         {
             ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl,
-                                         profile, path_cnt + 1, &parent_flags,
+                                         profile, path_cnt + 1, self_cnt, &parent_flags,
                                          f_vrfy, p_vrfy );
             if( ret != 0 )
                 return( ret );
@@ -2104,7 +2118,7 @@ static int x509_crt_verify_child(
         else
         {
             ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile,
-                                       path_cnt + 1, &parent_flags,
+                                       path_cnt + 1, self_cnt, &parent_flags,
                                        f_vrfy, p_vrfy );
             if( ret != 0 )
                 return( ret );
@@ -2149,7 +2163,7 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
 {
     size_t cn_len;
     int ret;
-    int pathlen = 0;
+    int pathlen = 0, selfsigned = 0;
     mbedtls_x509_crt *parent;
     mbedtls_x509_name *name;
     mbedtls_x509_sequence *cur = NULL;
@@ -2231,7 +2245,7 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
     if( parent != NULL )
     {
         ret = x509_crt_verify_top( crt, parent, ca_crl, profile,
-                                   pathlen, flags, f_vrfy, p_vrfy );
+                                   pathlen, selfsigned, flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
@@ -2240,6 +2254,14 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
         /* Look for a parent upwards the chain */
         for( parent = crt->next; parent != NULL; parent = parent->next )
         {
+            /* +2 because the current step is not yet accounted for
+             * and because max_pathlen is one higher than it should be */
+            if( parent->max_pathlen > 0 &&
+                parent->max_pathlen < 2 + pathlen )
+            {
+                continue;
+            }
+
             if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 )
                 break;
         }
@@ -2248,14 +2270,14 @@ int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
         if( parent != NULL )
         {
             ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile,
-                                         pathlen, flags, f_vrfy, p_vrfy );
+                                         pathlen, selfsigned, flags, f_vrfy, p_vrfy );
             if( ret != 0 )
                 return( ret );
         }
         else
         {
             ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile,
-                                       pathlen, flags, f_vrfy, p_vrfy );
+                                       pathlen, selfsigned, flags, f_vrfy, p_vrfy );
             if( ret != 0 )
                 return( ret );
         }

tests/data_files/dir4/Readme

@@ -0,0 +1,38 @@
+This directory contains the certificates for the tests targeting the enforcement of the policy indicated by the *pathLenConstraint* field. All leaf elements were generated with *is_ca* unset and all roots with the *selfsign=1* option. 
+
+1. zero pathlen constraint on an intermediate CA (invalid)
+```
+cert11.crt -> cert12.crt (max_pathlen=0) -> cert13.crt -> cert14.crt
+```
+
+2. zero pathlen constraint on the root CA (invalid)
+```
+cert21.crt (max_pathlen=0) -> cert22.crt -> cert23.crt
+```
+
+3. nonzero pathlen constraint on the root CA (invalid)
+```
+cert31.crt (max_pathlen=1) -> cert32.crt -> cert33.crt -> cert34.crt
+```
+
+4. nonzero pathlen constraint on an intermediate CA (invalid)
+```
+cert41.crt -> cert42.crt (max_pathlen=1) -> cert43.crt -> cert44.crt -> cert45.crt 
+```
+
+5. nonzero pathlen constraint on an intermediate CA with maximum number of elements in the chain (valid)
+```
+cert51.crt -> cert52.crt (max_pathlen=1) -> cert53.crt -> cert54.crt
+```
+
+6. nonzero pathlen constraint on the root CA with maximum number of elements in the chain (valid)
+```
+cert61.crt (max_pathlen=1) -> cert62.crt -> cert63.crt
+```
+
+7. pathlen constraint on the root CA with maximum number of elements and a self signed certificate in the chain (valid) 
+(This situation happens for example when a root of some hierarchy gets integrated into another hierarchy. In this case the certificates issued before the integration will have an intermadiate self signed certificate in their chain)
+```
+cert71.crt (max_pathlen=1) -> cert72.crt -> cert73.crt (self signed) -> cert74.crt -> cert74.crt
+```
+

tests/data_files/dir4/cert11.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC9zCCAd+gAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMBYxFDASBgNV
+BAMTC1Rlc3Qgcm9vdCAyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA
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+iy1H9Z9uCl+M7unbAl8BKQ8leOnno3KO3lQQAPGP2EFRT0XMuUXJnfydPbzMa9FY
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+GfiA42UWN2dKNSqNhBOrP9g5yTcIWXh1Dwpd1Z9vhBCwmBegPqqM5IM1dQ==
+-----END CERTIFICATE-----

tests/data_files/dir4/cert12.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDCjCCAfKgAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMCYxJDAiBgNV
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+sYdYvIpbrFXowjMtBdac+vvhcem7dkCrCdsGylGINWhE2tC9hKmFkFXo4mu/AGDS
+M4/59TlMeK8X+WZ9zBs=
+-----END CERTIFICATE-----

tests/data_files/dir4/cert13.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFzCCAf+gAwIBAgIBATANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDExtUZXN0
+IGludGVybWVkaWF0ZSBtYXhwYXRoIDEwHhcNMDEwMTAxMDAwMDAwWhcNMzAxMjMx
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+GOwl0V/JAslMWwUZlFmvYvoCWSWGrDAkxWVnHq+HoZ7YoM/bdJdsIIJYe3tt7L8D
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+m8pqKNnRYGCtQwppBYVsoBisga2ymtNud7K+
+-----END CERTIFICATE-----

tests/data_files/dir4/cert14.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDDDCCAfSgAwIBAgIBATANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDExtUZXN0
+IGludGVybWVkaWF0ZSBtYXhwYXRoIDIwHhcNMDEwMTAxMDAwMDAwWhcNMzAxMjMx
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+sZfh98BafcaFGjz605V36g==
+-----END CERTIFICATE-----

tests/data_files/dir4/cert21.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC+jCCAeKgAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMBYxFDASBgNV
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+sz940Q4njAJqlpfiJ44aFytjp96uN4YVpViFCvRz//9uyQY9kuA/8kKwJuO3qw==
+-----END CERTIFICATE-----

tests/data_files/dir4/cert22.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDBzCCAe+gAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMCYxJDAiBgNV
+BAMTG1Rlc3QgaW50ZXJtZWRpYXRlIG1heHBhdGggMTCCASIwDQYJKoZIhvcNAQEB
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+cXhf3q50V+M6T2IaQ9BxntTyCT8IIF2eRM/t9Y944s9Rfzm/KQVKRYPudX7YhTt9
+iqCJB4JoqYhs3HEO0wPkJxY4KBTUCN94s+7jUFdRrYxe+8Ya6tIYWqD38i5qdGhY
+xrVey1LatsDJQ2EgNYobM/LjoCLK1WUssEqf0OU2bi0CAwEAAaNQME4wDAYDVR0T
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+FoAUjgXdXx9NGPa+UvHBC4//SE+ARpQwDQYJKoZIhvcNAQELBQADggEBAFwZriTu
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+7XkKWxZovRwczgfDFRP9zM9CylyzQjqxx6kbxJozWnwc5UrVbJMaPIqonXp1nDoZ
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+j3zwng9liCsxurGMnuV0BPWv/IDYRu/syjee1Qv1VFeRto5D4Rldmi2p1f5iWJCk
+5m5YpRsknaICjYs=
+-----END CERTIFICATE-----

tests/data_files/dir4/cert23.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert31.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert32.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert33.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert34.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert41.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert42.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert43.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert44.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/data_files/dir4/cert45.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert51.crt

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tests/data_files/dir4/cert52.crt

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tests/data_files/dir4/cert53.crt

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tests/data_files/dir4/cert54.crt

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tests/data_files/dir4/cert61.crt

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+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert62.crt

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tests/data_files/dir4/cert63.crt

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+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert71.crt

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+-----END CERTIFICATE-----

tests/data_files/dir4/cert72.crt

@@ -0,0 +1,19 @@
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+7XkKWxZovRwczgfDFRP9zM9CylyzQjqxx6kbxJozWnwc5UrVbJMaPIqonXp1nDoZ
+i878+hX4rJUEjgO6Sa9GVZQpmuCrQF0qKsTiUBzZN67hoD3xoTAYi5IXQE2tRD1N
+j3zwng9liCsxurGMnuV0BPWv/IDYRu/syjee1Qv1VFeRto5D4Rldmi2p1f5iWJCk
+5m5YpRsknaICjYs=
+-----END CERTIFICATE-----

tests/data_files/dir4/cert73.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

tests/data_files/dir4/cert74.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

tests/suites/test_suite_x509parse.data

@@ -1128,6 +1128,38 @@ X509 CRT parse path #4 (two certs, one non-cert)
 depends_on:MBEDTLS_SHA1_C:MBEDTLS_RSA_C:MBEDTLS_SHA256_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED
 mbedtls_x509_crt_parse_path:"data_files/dir3":1:2
 
+X509 CRT verify chain #1 (zero pathlen intermediate)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert14.crt data_files/dir4/cert13.crt data_files/dir4/cert12.crt":"data_files/dir4/cert11.crt":MBEDTLS_X509_BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #2 (zero pathlen root)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert23.crt data_files/dir4/cert22.crt":"data_files/dir4/cert21.crt":MBEDTLS_X509_BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #3 (nonzero pathlen root)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert34.crt data_files/dir4/cert33.crt data_files/dir4/cert32.crt":"data_files/dir4/cert31.crt":MBEDTLS_X509_BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #4 (nonzero pathlen intermediate)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert45.crt data_files/dir4/cert44.crt data_files/dir4/cert43.crt data_files/dir4/cert42.crt":"data_files/dir4/cert41.crt":MBEDTLS_X509_BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #5 (nonzero maxpathlen intermediate)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert54.crt data_files/dir4/cert53.crt data_files/dir4/cert52.crt":"data_files/dir4/cert51.crt":0
+
+X509 CRT verify chain #6 (nonzero maxpathlen root)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert63.crt data_files/dir4/cert62.crt":"data_files/dir4/cert61.crt":0
+
+X509 CRT verify chain #7 (maxpathlen root, self signed in path)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert74.crt data_files/dir4/cert73.crt data_files/dir4/cert72.crt":"data_files/dir4/cert71.crt":0
+
+X509 CRT verify chain #8 (self signed maxpathlen root)
+depends_on:MBEDTLS_SHA256_C:MBEDTLS_RSA_C
+mbedtls_x509_crt_verify_chain:"data_files/dir4/cert61.crt data_files/dir4/cert63.crt data_files/dir4/cert62.crt":"data_files/dir4/cert61.crt":0
+
 X509 OID description #1
 x509_oid_desc:"2B06010505070301":"TLS Web Server Authentication"
 

tests/suites/test_suite_x509parse.function

@@ -440,6 +440,34 @@ exit:
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+void mbedtls_x509_crt_verify_chain(  char *chain_paths, char *trusted_ca, int flags_result )
+{
+    char* act;
+    uint32_t flags;
+    int result, res;
+    mbedtls_x509_crt trusted, chain;
+
+    result= flags_result?MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:0;
+
+    mbedtls_x509_crt_init( &chain );
+    mbedtls_x509_crt_init( &trusted );
+
+    while( ( act = strsep( &chain_paths, " " ) ) != NULL )
+        TEST_ASSERT( mbedtls_x509_crt_parse_file( &chain, act ) == 0 );
+    TEST_ASSERT( mbedtls_x509_crt_parse_file( &trusted, trusted_ca ) == 0 );
+
+    res = mbedtls_x509_crt_verify( &chain, &trusted, NULL, NULL, &flags, NULL, NULL );
+
+    TEST_ASSERT( res == ( result ) );
+    TEST_ASSERT( flags == (uint32_t)( flags_result ) );
+
+exit:
+    mbedtls_x509_crt_free( &trusted );
+    mbedtls_x509_crt_free( &chain );
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
 void x509_oid_desc( char *oid_str, char *ref_desc )
 {