/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <time.h>
#include <errno.h>

#include "internal/cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include <openssl/asn1.h>
#include <openssl/x509.h>
#include <openssl/objects.h>

const char *X509_verify_cert_error_string(long n)
{
    switch ((int)n) {
    case X509_V_OK:
        return ("ok");
    case X509_V_ERR_UNSPECIFIED:
        return ("unspecified certificate verification error");
    case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
        return ("unable to get issuer certificate");
    case X509_V_ERR_UNABLE_TO_GET_CRL:
        return ("unable to get certificate CRL");
    case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
        return ("unable to decrypt certificate's signature");
    case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
        return ("unable to decrypt CRL's signature");
    case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
        return ("unable to decode issuer public key");
    case X509_V_ERR_CERT_SIGNATURE_FAILURE:
        return ("certificate signature failure");
    case X509_V_ERR_CRL_SIGNATURE_FAILURE:
        return ("CRL signature failure");
    case X509_V_ERR_CERT_NOT_YET_VALID:
        return ("certificate is not yet valid");
    case X509_V_ERR_CERT_HAS_EXPIRED:
        return ("certificate has expired");
    case X509_V_ERR_CRL_NOT_YET_VALID:
        return ("CRL is not yet valid");
    case X509_V_ERR_CRL_HAS_EXPIRED:
        return ("CRL has expired");
    case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
        return ("format error in certificate's notBefore field");
    case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
        return ("format error in certificate's notAfter field");
    case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
        return ("format error in CRL's lastUpdate field");
    case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
        return ("format error in CRL's nextUpdate field");
    case X509_V_ERR_OUT_OF_MEM:
        return ("out of memory");
    case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
        return ("self signed certificate");
    case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
        return ("self signed certificate in certificate chain");
    case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
        return ("unable to get local issuer certificate");
    case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
        return ("unable to verify the first certificate");
    case X509_V_ERR_CERT_CHAIN_TOO_LONG:
        return ("certificate chain too long");
    case X509_V_ERR_CERT_REVOKED:
        return ("certificate revoked");
    case X509_V_ERR_INVALID_CA:
        return ("invalid CA certificate");
    case X509_V_ERR_PATH_LENGTH_EXCEEDED:
        return ("path length constraint exceeded");
    case X509_V_ERR_INVALID_PURPOSE:
        return ("unsupported certificate purpose");
    case X509_V_ERR_CERT_UNTRUSTED:
        return ("certificate not trusted");
    case X509_V_ERR_CERT_REJECTED:
        return ("certificate rejected");
    case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
        return ("subject issuer mismatch");
    case X509_V_ERR_AKID_SKID_MISMATCH:
        return ("authority and subject key identifier mismatch");
    case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
        return ("authority and issuer serial number mismatch");
    case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
        return ("key usage does not include certificate signing");
    case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
        return ("unable to get CRL issuer certificate");
    case X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION:
        return ("unhandled critical extension");
    case X509_V_ERR_KEYUSAGE_NO_CRL_SIGN:
        return ("key usage does not include CRL signing");
    case X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION:
        return ("unhandled critical CRL extension");
    case X509_V_ERR_INVALID_NON_CA:
        return ("invalid non-CA certificate (has CA markings)");
    case X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
        return ("proxy path length constraint exceeded");
    case X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE:
        return ("key usage does not include digital signature");
    case X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
        return
            ("proxy certificates not allowed, please set the appropriate flag");
    case X509_V_ERR_INVALID_EXTENSION:
        return ("invalid or inconsistent certificate extension");
    case X509_V_ERR_INVALID_POLICY_EXTENSION:
        return ("invalid or inconsistent certificate policy extension");
    case X509_V_ERR_NO_EXPLICIT_POLICY:
        return ("no explicit policy");
    case X509_V_ERR_DIFFERENT_CRL_SCOPE:
        return ("Different CRL scope");
    case X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE:
        return ("Unsupported extension feature");
    case X509_V_ERR_UNNESTED_RESOURCE:
        return ("RFC 3779 resource not subset of parent's resources");
    case X509_V_ERR_PERMITTED_VIOLATION:
        return ("permitted subtree violation");
    case X509_V_ERR_EXCLUDED_VIOLATION:
        return ("excluded subtree violation");
    case X509_V_ERR_SUBTREE_MINMAX:
        return ("name constraints minimum and maximum not supported");
    case X509_V_ERR_APPLICATION_VERIFICATION:
        return ("application verification failure");
    case X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:
        return ("unsupported name constraint type");
    case X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX:
        return ("unsupported or invalid name constraint syntax");
    case X509_V_ERR_UNSUPPORTED_NAME_SYNTAX:
        return ("unsupported or invalid name syntax");
    case X509_V_ERR_CRL_PATH_VALIDATION_ERROR:
        return ("CRL path validation error");
    case X509_V_ERR_PATH_LOOP:
        return ("Path Loop");
    case X509_V_ERR_SUITE_B_INVALID_VERSION:
        return ("Suite B: certificate version invalid");
    case X509_V_ERR_SUITE_B_INVALID_ALGORITHM:
        return ("Suite B: invalid public key algorithm");
    case X509_V_ERR_SUITE_B_INVALID_CURVE:
        return ("Suite B: invalid ECC curve");
    case X509_V_ERR_SUITE_B_INVALID_SIGNATURE_ALGORITHM:
        return ("Suite B: invalid signature algorithm");
    case X509_V_ERR_SUITE_B_LOS_NOT_ALLOWED:
        return ("Suite B: curve not allowed for this LOS");
    case X509_V_ERR_SUITE_B_CANNOT_SIGN_P_384_WITH_P_256:
        return ("Suite B: cannot sign P-384 with P-256");
    case X509_V_ERR_HOSTNAME_MISMATCH:
        return ("Hostname mismatch");
    case X509_V_ERR_EMAIL_MISMATCH:
        return ("Email address mismatch");
    case X509_V_ERR_IP_ADDRESS_MISMATCH:
        return ("IP address mismatch");
    case X509_V_ERR_DANE_NO_MATCH:
        return ("No matching DANE TLSA records");
    case X509_V_ERR_EE_KEY_TOO_SMALL:
        return ("EE certificate key too weak");
    case X509_V_ERR_CA_KEY_TOO_SMALL:
        return ("CA certificate key too weak");
    case X509_V_ERR_CA_MD_TOO_WEAK:
        return ("CA signature digest algorithm too weak");
    case X509_V_ERR_INVALID_CALL:
        return ("Invalid certificate verification context");
    case X509_V_ERR_STORE_LOOKUP:
        return ("Issuer certificate lookup error");
    case X509_V_ERR_NO_VALID_SCTS:
        return ("Certificate Transparency required, but no valid SCTs found");
    case X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION:
        return ("proxy subject name violation");

    default:
        /* Printing an error number into a static buffer is not thread-safe */
        return ("unknown certificate verification error");
    }
}