Added test case for pathlen constrains in intermediate certificates

tests/data_files/dir4/cert11.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC9zCCAd+gAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMBYxFDASBgNV
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+83ZHe4IdvenkXckDMIjmSsK0GfomZmKvmnfxhg4FnQvZGI48JJUqPA2dHxRhUyr4
+ohBmH5Xi5oLICd85GRi8YqD00agKL99EjGulaKNEdsQkrC4ZvY6QDV0EEnbu8b4R
+GfiA42UWN2dKNSqNhBOrP9g5yTcIWXh1Dwpd1Z9vhBCwmBegPqqM5IM1dQ==
+-----END CERTIFICATE-----

tests/data_files/dir4/cert12.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDCjCCAfKgAwIBAgIBATANBgkqhkiG9w0BAQsFADAWMRQwEgYDVQQDEwtUZXN0
+IHJvb3QgMjAeFw0wMTAxMDEwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMCYxJDAiBgNV
+BAMTG1Rlc3QgaW50ZXJtZWRpYXRlIG1heHBhdGggMTCCASIwDQYJKoZIhvcNAQEB
+BQADggEPADCCAQoCggEBANJrP7/Y+KjupvlgaOmQYArfGuoh3CzcdPe/mlhq+fxD
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+XkZodsrJUQerDh/7VmDVEeKanZog8auvrvs/ENiA8d4p/75lOIER4nLz6SSn5Eqy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+-----END CERTIFICATE-----

tests/data_files/dir4/cert13.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----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+/cO3++uq+CkZhBu8vupaznXD4h0E28GbZgvu/F0edB7f0Q5DpnuDJ6HFMYl3A2mM
+m8pqKNnRYGCtQwppBYVsoBisga2ymtNud7K+
+-----END CERTIFICATE-----

tests/data_files/dir4/cert14.crt

@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDDDCCAfSgAwIBAgIBATANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDExtUZXN0
+IGludGVybWVkaWF0ZSBtYXhwYXRoIDIwHhcNMDEwMTAxMDAwMDAwWhcNMzAxMjMx
+MjM1OTU5WjAeMRwwGgYDVQQDExNUZXN0IGxlYWYgaW52YWxpZCAzMIIBIjANBgkq
+hkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw6Vc/T2GYTWj7nGZcy2voZyeWkFyfDIy
+oexyJe8eyuWX+YqaSCra1JMcww0Jy8e9/6/aI9ezd1d73eZDcW5h61tagCpBki+W
+dYh+FJfCdDdPnSkitWOBLKBK21AQ9dxePvkQBEanDdAk2IwasydCoHEiSCqwXNEz
+jVJPL38ibbLf9sNO3kk6zOFA3QqVSTJ4BddNh9bHL7y106ekfMhrfyTzSpo3Wj0V
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+4aDkjXXOizRxDPxCHp7rLz9xv1pIIBxady0YWp+w9vxLxFF6rYBLtQIDAQABo00w
+SzAJBgNVHRMEAjAAMB0GA1UdDgQWBBQoF/qrn9WnKV3zOnCwMl99Uhmx8DAfBgNV
+HSMEGDAWgBTOruRpI5MW/Dw3UCBigw/LdWb//TANBgkqhkiG9w0BAQsFAAOCAQEA
+VUnlX//h3T5Ajc85WNkyTuirhSZtIr6+X/AxH4kR/QG5NiaDxP9H0FzMs5FcMni8
+3Rs4d2H3CBs+QB7lm/b+xy26vpORwlVFXScHeTEanuXSVsmGPkn7TAQrPoyZgVUN
+uy4TGi8Mlkso4gmgehvgTklIV+Emxy32Abd1lRfI8/vOQ1xTdA7f3X98AfWStTya
+DGRsQLZE/Q4/Gh57xNqF0ftBIRwt9TbGlu8AyZiIilVECGvE/gtTwuqpQPOhJQmi
+NdYTErgD2Wkw9ohifQFo46AMMU1seehtqijW2pC2UjmV5nboPs0eGQmWrfNCjDOr
+sZfh98BafcaFGjz605V36g==
+-----END CERTIFICATE-----

tests/suites/test_suite_x509parse.data

@@ -358,6 +358,10 @@ 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 path (4 certs)
+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":8
+
 X509 Parse Selftest
 depends_on:POLARSSL_MD5_C:POLARSSL_PEM_C:POLARSSL_SELF_TEST
 x509_selftest:

tests/suites/test_suite_x509parse.function

@@ -274,6 +274,33 @@ x509parse_key:key_data:result_str:result
 }
 END_CASE
 
+BEGIN_CASE
+x509_crt_verify_chain:chain_paths_str:trusted_ca:ret
+{
+    char *act;
+    int flags;
+    int 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 = strsep( &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 );
+
+    TEST_ASSERT( ( {ret} ) == res );
+}
+END_CASE
+
 BEGIN_CASE
 x509_selftest:
 {