class OpenSSL::Timestamp::Response

Immutable and read-only representation of a timestamp response returned from a timestamp server after receiving an associated Request. Allows access to specific information about the response but also allows to verify the Response.

Constants

GRANTED: Indicates a successful response. Equal to 0.
GRANTED_WITH_MODS: Indicates a successful response that probably contains modifications from the initial request. Equal to 1.
REJECTION: Indicates a failure. No timestamp token was created. Equal to 2.
REVOCATION_NOTIFICATION: Indicates a failure. No timestamp token was created. A certificate has been revoked. Equal to 5.
REVOCATION_WARNING: Indicates a failure. No timestamp token was created. Revocation of a certificate is imminent. Equal to 4.
WAITING: Indicates a failure. No timestamp token was created. Equal to 3.

Public Class Methods

OpenSSL::Timestamp::Response.new(file) → response click to toggle source

OpenSSL::Timestamp::Response.new(string) → response

Creates a Response from a File or string parameter, the corresponding File or string must be DER-encoded. Please note that Response is an immutable read-only class. If you'd like to create timestamps please refer to Factory instead.

static VALUE
ossl_ts_resp_initialize(VALUE self, VALUE der)
{
    TS_RESP *ts_resp = DATA_PTR(self);
    BIO *in;

    der = ossl_to_der_if_possible(der);
    in  = ossl_obj2bio(&der);
    ts_resp = d2i_TS_RESP_bio(in, &ts_resp);
    BIO_free(in);
    if (!ts_resp) {
        DATA_PTR(self) = NULL;
        ossl_raise(eTimestampError, "Error when decoding the timestamp response");
    }
    DATA_PTR(self) = ts_resp;

    return self;
}

Public Instance Methods

failure_info → nil or symbol click to toggle source

In cases no timestamp token has been created, this field contains further info about the reason why response creation failed. The method returns either nil (the request was successful and a timestamp token was created) or one of the following:

:BAD_ALG - Indicates that the timestamp server rejects the message imprint algorithm used in the Request
:BAD_REQUEST - Indicates that the timestamp server was not able to process the Request properly
:BAD_DATA_FORMAT - Indicates that the timestamp server was not able to parse certain data in the Request
:TIME_NOT_AVAILABLE - Indicates that the server could not access its time source
:UNACCEPTED_POLICY - Indicates that the requested policy identifier is not recognized or supported by the timestamp server
:UNACCEPTED_EXTENSIION - Indicates that an extension in the Request is not supported by the timestamp server
:ADD_INFO_NOT_AVAILABLE -Indicates that additional information requested is either not understood or currently not available
:SYSTEM_FAILURE - Timestamp creation failed due to an internal error that occurred on the timestamp server

static VALUE
ossl_ts_resp_get_failure_info(VALUE self)
{
    TS_RESP *resp;
    TS_STATUS_INFO *si;

    /* The ASN1_BIT_STRING_get_bit changed from 1.0.0. to 1.1.0, making this
     * const. */
    #if defined(HAVE_TS_STATUS_INFO_GET0_FAILURE_INFO)
    const ASN1_BIT_STRING *fi;
    #else
    ASN1_BIT_STRING *fi;
    #endif

    GetTSResponse(self, resp);
    si = TS_RESP_get_status_info(resp);
    fi = TS_STATUS_INFO_get0_failure_info(si);
    if (!fi)
        return Qnil;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_BAD_ALG))
        return sBAD_ALG;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_BAD_REQUEST))
        return sBAD_REQUEST;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_BAD_DATA_FORMAT))
        return sBAD_DATA_FORMAT;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_TIME_NOT_AVAILABLE))
        return sTIME_NOT_AVAILABLE;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_UNACCEPTED_POLICY))
        return sUNACCEPTED_POLICY;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_UNACCEPTED_EXTENSION))
        return sUNACCEPTED_EXTENSION;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_ADD_INFO_NOT_AVAILABLE))
        return sADD_INFO_NOT_AVAILABLE;
    if (ASN1_BIT_STRING_get_bit(fi, TS_INFO_SYSTEM_FAILURE))
        return sSYSTEM_FAILURE;

    ossl_raise(eTimestampError, "Unrecognized failure info.");
}

status → BN (never nil) click to toggle source

Returns one of GRANTED, GRANTED_WITH_MODS, REJECTION, WAITING, REVOCATION_WARNING or REVOCATION_NOTIFICATION. A timestamp token has been created only in case status is equal to GRANTED or GRANTED_WITH_MODS.

static VALUE
ossl_ts_resp_get_status(VALUE self)
{
    TS_RESP *resp;
    TS_STATUS_INFO *si;
    const ASN1_INTEGER *st;

    GetTSResponse(self, resp);
    si = TS_RESP_get_status_info(resp);
    st = TS_STATUS_INFO_get0_status(si);

    return asn1integer_to_num(st);
}

status_text → Array of strings or nil click to toggle source

In cases of failure this field may contain an array of strings further describing the origin of the failure.

static VALUE
ossl_ts_resp_get_status_text(VALUE self)
{
    TS_RESP *resp;
    TS_STATUS_INFO *si;
    const STACK_OF(ASN1_UTF8STRING) *text;
    ASN1_UTF8STRING *current;
    int i;
    VALUE ret = rb_ary_new();

    GetTSResponse(self, resp);
    si = TS_RESP_get_status_info(resp);
    if ((text = TS_STATUS_INFO_get0_text(si))) {
        for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
            current = sk_ASN1_UTF8STRING_value(text, i);
            rb_ary_push(ret, asn1str_to_str(current));
        }
    }

    return ret;
}

to_der → string click to toggle source

Returns the Response in DER-encoded form.

static VALUE
ossl_ts_resp_to_der(VALUE self)
{
    TS_RESP *resp;

    GetTSResponse(self, resp);
    return asn1_to_der((void *)resp, (int (*)(void *, unsigned char **))i2d_TS_RESP);
}

token → nil or OpenSSL::PKCS7 click to toggle source

If a timestamp token is present, this returns it in the form of a OpenSSL::PKCS7.

static VALUE
ossl_ts_resp_get_token(VALUE self)
{
    TS_RESP *resp;
    PKCS7 *p7, *copy;
    VALUE obj;

    GetTSResponse(self, resp);
    if (!(p7 = TS_RESP_get_token(resp)))
        return Qnil;

    obj = NewPKCS7(cPKCS7);

    if (!(copy = PKCS7_dup(p7)))
        ossl_raise(eTimestampError, NULL);

    SetPKCS7(obj, copy);

    return obj;
}

token_info → nil or OpenSSL::Timestamp::TokenInfo click to toggle source

Get the response's token info if present.

static VALUE
ossl_ts_resp_get_token_info(VALUE self)
{
    TS_RESP *resp;
    TS_TST_INFO *info, *copy;
    VALUE obj;

    GetTSResponse(self, resp);
    if (!(info = TS_RESP_get_tst_info(resp)))
        return Qnil;

    obj = NewTSTokenInfo(cTimestampTokenInfo);

    if (!(copy = TS_TST_INFO_dup(info)))
        ossl_raise(eTimestampError, NULL);

    SetTSTokenInfo(obj, copy);

    return obj;
}

tsa_certificate → OpenSSL::X509::Certificate or nil click to toggle source

If the Request specified to request the TSA certificate (Request#cert_requested = true), then this field contains the certificate of the timestamp authority.

static VALUE
ossl_ts_resp_get_tsa_certificate(VALUE self)
{
    TS_RESP *resp;
    PKCS7 *p7;
    PKCS7_SIGNER_INFO *ts_info;
    X509 *cert;

    GetTSResponse(self, resp);
    if (!(p7 = TS_RESP_get_token(resp)))
        return Qnil;
    ts_info = sk_PKCS7_SIGNER_INFO_value(p7->d.sign->signer_info, 0);
    cert = PKCS7_cert_from_signer_info(p7, ts_info);
    if (!cert)
        return Qnil;
    return ossl_x509_new(cert);
}

verify(Request, root_store) → Response click to toggle source

verify(Request, root_store, [intermediate_cert]) → Response

Verifies a timestamp token by checking the signature, validating the certificate chain implied by tsa_certificate and by checking conformance to a given Request. Mandatory parameters are the Request associated to this Response, and an OpenSSL::X509::Store of trusted roots.

Intermediate certificates can optionally be supplied for creating the certificate chain. These intermediate certificates must all be instances of OpenSSL::X509::Certificate.

If validation fails, several kinds of exceptions can be raised:

TypeError if types don't fit
TimestampError if something is wrong with the timestamp token itself, if it is not conformant to the Request, or if validation of the timestamp certificate chain fails.

static VALUE
ossl_ts_resp_verify(int argc, VALUE *argv, VALUE self)
{
    VALUE ts_req, store, intermediates;
    TS_RESP *resp;
    TS_REQ *req;
    X509_STORE *x509st;
    TS_VERIFY_CTX *ctx;
    STACK_OF(X509) *x509inter = NULL;
    PKCS7* p7;
    X509 *cert;
    int status, i, ok;

    rb_scan_args(argc, argv, "21", &ts_req, &store, &intermediates);

    GetTSResponse(self, resp);
    GetTSRequest(ts_req, req);
    x509st = GetX509StorePtr(store);

    if (!(ctx = TS_REQ_to_TS_VERIFY_CTX(req, NULL))) {
        ossl_raise(eTimestampError, "Error when creating the verification context.");
    }

    if (!NIL_P(intermediates)) {
        x509inter = ossl_protect_x509_ary2sk(intermediates, &status);
        if (status) {
            TS_VERIFY_CTX_free(ctx);
            rb_jump_tag(status);
        }
    } else if (!(x509inter = sk_X509_new_null())) {
        TS_VERIFY_CTX_free(ctx);
        ossl_raise(eTimestampError, "sk_X509_new_null");
    }

    if (!(p7 = TS_RESP_get_token(resp))) {
        TS_VERIFY_CTX_free(ctx);
        sk_X509_pop_free(x509inter, X509_free);
        ossl_raise(eTimestampError, "TS_RESP_get_token");
    }
    for (i=0; i < sk_X509_num(p7->d.sign->cert); i++) {
        cert = sk_X509_value(p7->d.sign->cert, i);
        if (!sk_X509_push(x509inter, cert)) {
            sk_X509_pop_free(x509inter, X509_free);
            TS_VERIFY_CTX_free(ctx);
            ossl_raise(eTimestampError, "sk_X509_push");
        }
        X509_up_ref(cert);
    }

    TS_VERIFY_CTS_set_certs(ctx, x509inter);
    TS_VERIFY_CTX_add_flags(ctx, TS_VFY_SIGNATURE);
    TS_VERIFY_CTX_set_store(ctx, x509st);

    ok = TS_RESP_verify_response(ctx, resp);

    /* WORKAROUND:
     *   X509_STORE can count references, but X509_STORE_free() doesn't check
     *   this. To prevent our X509_STORE from being freed with our
     *   TS_VERIFY_CTX we set the store to NULL first.
     *   Fixed in OpenSSL 1.0.2; bff9ce4db38b (master), 5b4b9ce976fc (1.0.2)
     */
    TS_VERIFY_CTX_set_store(ctx, NULL);
    TS_VERIFY_CTX_free(ctx);

    if (!ok)
        ossl_raise(eTimestampError, "TS_RESP_verify_response");

    return self;
}