Merge branch 'polarssl-1.2' into polarssl-1.2-restricted

* polarssl-1.2:
  Use own implementation of strsep()
  Add Changelog entries for this branch
  Use symbolic constants in test data
  Fixed pathlen contraint enforcement.
  Additional corner cases for testing pathlen constrains
  Added test case for pathlen constrains in intermediate certificates

ChangeLog

@@ -10,8 +10,14 @@ Security
      Cannot be triggered remotely unless you create X.509 certificates based
      on untrusted input or write keys of untrusted origin. Found by Guido
      Vranken, Interlworks.
+   * 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
 
 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 failures in MPI on Sparc(64) due to use of bad assembly code.
      Found by Kurt Danielson. #292
 

library/x509parse.c

@@ -3387,7 +3387,8 @@ static int x509_wildcard_verify( const char *cn, x509_buf *name )
 
 static int x509parse_verify_top(
                 x509_cert *child, x509_cert *trust_ca,
-                x509_crl *ca_crl, int path_cnt, int *flags,
+                x509_crl *ca_crl,
+                int path_cnt, int self_cnt, int *flags,
                 int (*f_vrfy)(void *, x509_cert *, int, int *),
                 void *p_vrfy )
 {
@@ -3428,8 +3429,9 @@ static int x509parse_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 )
         {
             trust_ca = trust_ca->next;
             continue;
@@ -3493,7 +3495,8 @@ static int x509parse_verify_top(
 
 static int x509parse_verify_child(
                 x509_cert *child, x509_cert *parent, x509_cert *trust_ca,
-                x509_crl *ca_crl, int path_cnt, int *flags,
+                x509_crl *ca_crl,
+                int path_cnt, int self_cnt, int *flags,
                 int (*f_vrfy)(void *, x509_cert *, int, int *),
                 void *p_vrfy )
 {
@@ -3502,6 +3505,15 @@ static int x509parse_verify_child(
     unsigned char hash[64];
     x509_cert *grandparent;
 
+    /* Counting intermediate self signed certificates */
+    if( path_cnt != 0 &&
+        child->issuer_raw.len == child->subject_raw.len &&
+        memcmp( child->issuer_raw.p, child->subject_raw.p,
+                child->issuer_raw.len ) == 0 )
+    {
+        self_cnt++;
+    }
+
     /* path_cnt is 0 for the first intermediate CA */
     if( 1 + path_cnt > POLARSSL_X509_MAX_INTERMEDIATE_CA )
     {
@@ -3539,6 +3551,17 @@ static int x509parse_verify_child(
             grandparent = grandparent->next;
             continue;
         }
+
+        /* +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 )
+        {
+            grandparent = grandparent->next;
+            continue;
+        }
+
         break;
     }
 
@@ -3547,13 +3570,13 @@ static int x509parse_verify_child(
         /*
          * Part of the chain
          */
-        ret = x509parse_verify_child( parent, grandparent, trust_ca, ca_crl, path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
+        ret = x509parse_verify_child( parent, grandparent, trust_ca, ca_crl, path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
     else
     {
-        ret = x509parse_verify_top( parent, trust_ca, ca_crl, path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
+        ret = x509parse_verify_top( parent, trust_ca, ca_crl, path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     }
@@ -3581,6 +3604,7 @@ int x509parse_verify( x509_cert *crt,
     size_t cn_len;
     int ret;
     int pathlen = 0;
+    int selfsigned = 0;
     x509_cert *parent;
     x509_name *name;
     x509_sequence *cur = NULL;
@@ -3654,6 +3678,16 @@ int x509parse_verify( x509_cert *crt,
             parent = parent->next;
             continue;
         }
+
+        /* +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 )
+        {
+            parent = parent->next;
+            continue;
+        }
+
         break;
     }
 
@@ -3662,13 +3696,13 @@ int x509parse_verify( x509_cert *crt,
         /*
          * Part of the chain
          */
-        ret = x509parse_verify_child( crt, parent, trust_ca, ca_crl, pathlen, flags, f_vrfy, p_vrfy );
+        ret = x509parse_verify_child( crt, parent, trust_ca, ca_crl, pathlen, selfsigned, flags, f_vrfy, p_vrfy );
         if( ret != 0 )
             return( ret );
     } 
     else
     {
-        ret = x509parse_verify_top( crt, trust_ca, ca_crl, pathlen, flags, f_vrfy, p_vrfy );
+        ret = x509parse_verify_top( crt, trust_ca, ca_crl, 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
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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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+M4/59TlMeK8X+WZ9zBs=
+-----END CERTIFICATE-----

tests/data_files/dir4/cert13.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDFzCCAf+gAwIBAgIBATANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDExtUZXN0
+IGludGVybWVkaWF0ZSBtYXhwYXRoIDEwHhcNMDEwMTAxMDAwMDAwWhcNMzAxMjMx
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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
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+5m5YpRsknaICjYs=
+-----END CERTIFICATE-----

tests/data_files/dir4/cert23.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDDDCCAfSgAwIBAgIBATANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDExtUZXN0
+IGludGVybWVkaWF0ZSBtYXhwYXRoIDEwHhcNMDEwMTAxMDAwMDAwWhcNMzAxMjMx
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+drslrvAR2W0qjHLULAJGk/6WzxFG6xeCgdhkooDPprsflZJ/cN1SuqTYOaVMAj9J
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tests/data_files/dir4/cert31.crt

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tests/data_files/dir4/cert32.crt

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tests/data_files/dir4/cert33.crt

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tests/data_files/dir4/cert34.crt

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tests/data_files/dir4/cert41.crt

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tests/data_files/dir4/cert42.crt

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tests/data_files/dir4/cert43.crt

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tests/data_files/dir4/cert44.crt

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tests/data_files/dir4/cert45.crt

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tests/data_files/dir4/cert51.crt

@@ -0,0 +1,18 @@
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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

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
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tests/data_files/dir4/cert62.crt

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

tests/data_files/dir4/cert72.crt

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

tests/data_files/dir4/cert73.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
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+MjM1OTU5WjAmMSQwIgYDVQQDExtUZXN0IGludGVybWVkaWF0ZSBtYXhwYXRoIDEw
+ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDaRpQTF3aPHDvaKlMP2+jz
+MIjDVfCwnusAfVShz2ujhkNKPF6pLYMJ4da6I4KTIWwgKRO1F3jK+mRqvzbapjtY
+TuWnVeSXoVmcr4O4+BAaRoPIlqNIzaSjCdGMdbgZJJYxHWS0x2uGyv88tjSqgzUt
+slrPfzOfscOVxNnnAIOxU3F4X96udFfjOk9iGkPQcZ7U8gk/CCBdnkTP7fWPeOLP
+UX85vykFSkWD7nV+2IU7fYqgiQeCaKmIbNxxDtMD5CcWOCgU1AjfeLPu41BXUa2M
+XvvGGurSGFqg9/IuanRoWMa1XstS2rbAyUNhIDWKGzPy46AiytVlLLBKn9DlNm4t
+AgMBAAGjUDBOMAwGA1UdEwQFMAMBAQEwHQYDVR0OBBYEFDgZfHnVZvx+cXUthBhH
+i837Wfw1MB8GA1UdIwQYMBaAFDgZfHnVZvx+cXUthBhHi837Wfw1MA0GCSqGSIb3
+DQEBCwUAA4IBAQDPQC9vYJegBgVZHu0StoRT7L6ShWcZc5Z/TeyrqJBdoiguSRq5
+kMiFXZpksxeFlIUYry21MigYqxOXGZ2GZYNqhLpYVh7hzAY8uYvf4U70q88zj7mw
+gIcgEaMd71GHqbb2O5x3fCN7vLeU5DFYBWfqLlkL57Uqr2aRDHlucryyRNordicN
+WbCxPozmqtbNMABEUbjLMCCuzJeNRSZbS0OOod6Xd3N00EK7PqaRhbihbq3L6gUG
+MjUI2keSxW4vXcDfI5Hqem6SHpCc3retx2VUgwIDAoTrw7E4dwmyC4Tp7TDJL/+d
+GU8qhRmoQer7mLUzpb3s8mq/4rZx+alTQ3gu
+-----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

@@ -358,6 +358,38 @@ X509 Certificate verification #31 (domain not matching multi certificate without
 depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO
 x509_verify:"data_files/cert_example_multi_nocn.crt":"data_files/test-ca.crt":"data_files/crl.pem":"www.example.net":POLARSSL_ERR_X509_CERT_VERIFY_FAILED:BADCERT_CN_MISMATCH + BADCERT_NOT_TRUSTED:NULL
 
++X509 CRT verify chain #1 (zero pathlen intermediate)
+depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+x509_crt_verify_chain:"data_files/dir4/cert14.crt data_files/dir4/cert13.crt data_files/dir4/cert12.crt":"data_files/dir4/cert11.crt":BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #2 (zero pathlen root)
+depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+x509_crt_verify_chain:"data_files/dir4/cert23.crt data_files/dir4/cert22.crt":"data_files/dir4/cert21.crt":BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #3 (nonzero pathlen root)
+depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+x509_crt_verify_chain:"data_files/dir4/cert34.crt data_files/dir4/cert33.crt data_files/dir4/cert32.crt":"data_files/dir4/cert31.crt":BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #4 (nonzero pathlen intermediate)
+depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+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":BADCERT_NOT_TRUSTED
+
+X509 CRT verify chain #5 (nonzero maxpathlen intermediate)
+depends_on:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+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:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+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:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+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:POLARSSL_PEM_C:POLARSSL_FS_IO:POLARSSL_SHA2_C
+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 Parse Selftest
 depends_on:POLARSSL_MD5_C:POLARSSL_PEM_C:POLARSSL_SELF_TEST
 x509_selftest:

tests/suites/test_suite_x509parse.function

@@ -22,6 +22,35 @@ int verify_all( void *data, x509_cert *crt, int certificate_depth, int *flags )
     return 0;
 }
 
+/* strsep() not available on Windows */
+char *mystrsep(char **stringp, const char *delim)
+{
+    const char *p;
+    char *ret = *stringp;
+
+    if( *stringp == NULL )
+        return( NULL );
+
+    for( ; ; (*stringp)++ )
+    {
+        if( **stringp == '\0' )
+        {
+            *stringp = NULL;
+            goto done;
+        }
+
+        for( p = delim; *p != '\0'; p++ )
+            if( **stringp == *p )
+            {
+                **stringp = '\0';
+                (*stringp)++;
+                goto done;
+            }
+    }
+
+done:
+    return( ret );
+}
 END_HEADER
 
 BEGIN_DEPENDENCIES
@@ -274,6 +303,36 @@ x509parse_key:key_data:result_str:result
 }
 END_CASE
 
+BEGIN_CASE
+x509_crt_verify_chain:chain_paths_str:trusted_ca:flags_result
+{
+    char *act;
+    int flags;
+    int result, res;
+    x509_cert trusted, chain;
+    char *chain_paths;
+
+    memset( &chain, 0, sizeof( x509_cert ) );
+    memset( &trusted, 0, sizeof( x509_cert ) );
+    chain_paths = strdup( {chain_paths_str} );
+    TEST_ASSERT( chain_paths != NULL );
+
+    while( ( act = mystrsep( &chain_paths, " " ) ) != NULL )
+        TEST_ASSERT( x509parse_crtfile( &chain, act ) == 0 );
+    TEST_ASSERT( x509parse_crtfile( &trusted, {trusted_ca} ) == 0 );
+
+    res = x509parse_verify( &chain, &trusted, NULL, NULL, &flags, NULL, NULL );
+
+    x509_free( &trusted );
+    x509_free( &chain );
+
+    result = ( {flags_result} ) ? POLARSSL_ERR_X509_CERT_VERIFY_FAILED : 0;
+
+    TEST_ASSERT( res == result );
+    TEST_ASSERT( flags == ( {flags_result} ) );
+}
+END_CASE
+
 BEGIN_CASE
 x509_selftest:
 {