Exemplo n.º 1
0
static krb5_error_code
return_pkinit_kx(krb5_context context, krb5_kdc_req *request,
                 krb5_kdc_rep *reply, krb5_keyblock *encrypting_key,
                 krb5_pa_data **out_padata)
{
    krb5_error_code ret = 0;
    krb5_keyblock *session = reply->ticket->enc_part2->session;
    krb5_keyblock *new_session = NULL;
    krb5_pa_data *pa = NULL;
    krb5_enc_data enc;
    krb5_data *scratch = NULL;

    *out_padata = NULL;
    enc.ciphertext.data = NULL;
    if (!krb5_principal_compare(context, request->client,
                                krb5_anonymous_principal()))
        return 0;
    /*
     * The KDC contribution key needs to be a fresh key of an enctype supported
     * by the client and server. The existing session key meets these
     * requirements so we use it.
     */
    ret = krb5_c_fx_cf2_simple(context, session, "PKINIT",
                               encrypting_key, "KEYEXCHANGE",
                               &new_session);
    if (ret)
        goto cleanup;
    ret = encode_krb5_encryption_key( session, &scratch);
    if (ret)
        goto cleanup;
    ret = krb5_encrypt_helper(context, encrypting_key,
                              KRB5_KEYUSAGE_PA_PKINIT_KX, scratch, &enc);
    if (ret)
        goto cleanup;
    memset(scratch->data, 0, scratch->length);
    krb5_free_data(context, scratch);
    scratch = NULL;
    ret = encode_krb5_enc_data(&enc, &scratch);
    if (ret)
        goto cleanup;
    pa = malloc(sizeof(krb5_pa_data));
    if (pa == NULL) {
        ret = ENOMEM;
        goto cleanup;
    }
    pa->pa_type = KRB5_PADATA_PKINIT_KX;
    pa->length = scratch->length;
    pa->contents = (krb5_octet *) scratch->data;
    *out_padata = pa;
    scratch->data = NULL;
    memset(session->contents, 0, session->length);
    krb5_free_keyblock_contents(context, session);
    *session = *new_session;
    new_session->contents = NULL;
cleanup:
    krb5_free_data_contents(context, &enc.ciphertext);
    krb5_free_keyblock(context, new_session);
    krb5_free_data(context, scratch);
    return ret;
}
Exemplo n.º 2
0
static krb5_error_code
prepare_error_as (struct kdc_request_state *rstate, krb5_kdc_req *request,
                  int error, krb5_pa_data **e_data, krb5_boolean typed_e_data,
                  krb5_principal canon_client, krb5_data **response,
                  const char *status)
{
    krb5_error errpkt;
    krb5_error_code retval;
    krb5_data *scratch = NULL, *e_data_asn1 = NULL, *fast_edata = NULL;
    kdc_realm_t *kdc_active_realm = rstate->realm_data;

    errpkt.ctime = request->nonce;
    errpkt.cusec = 0;

    retval = krb5_us_timeofday(kdc_context, &errpkt.stime, &errpkt.susec);
    if (retval)
        return retval;
    errpkt.error = error;
    errpkt.server = request->server;
    errpkt.client = (error == KRB5KDC_ERR_WRONG_REALM) ? canon_client :
        request->client;
    errpkt.text = string2data((char *)status);

    if (e_data != NULL) {
        if (typed_e_data)
            retval = encode_krb5_typed_data(e_data, &e_data_asn1);
        else
            retval = encode_krb5_padata_sequence(e_data, &e_data_asn1);
        if (retval)
            goto cleanup;
        errpkt.e_data = *e_data_asn1;
    } else
        errpkt.e_data = empty_data();

    retval = kdc_fast_handle_error(kdc_context, rstate, request, e_data,
                                   &errpkt, &fast_edata);
    if (retval)
        goto cleanup;
    if (fast_edata != NULL)
        errpkt.e_data = *fast_edata;

    scratch = k5alloc(sizeof(*scratch), &retval);
    if (scratch == NULL)
        goto cleanup;
    if (kdc_fast_hide_client(rstate) && errpkt.client != NULL)
        errpkt.client = (krb5_principal)krb5_anonymous_principal();
    retval = krb5_mk_error(kdc_context, &errpkt, scratch);
    if (retval)
        goto cleanup;

    *response = scratch;
    scratch = NULL;

cleanup:
    krb5_free_data(kdc_context, fast_edata);
    krb5_free_data(kdc_context, e_data_asn1);
    free(scratch);
    return retval;
}
Exemplo n.º 3
0
static krb5_error_code
pkinit_server_verify_padata(krb5_context context,
                            struct _krb5_db_entry_new * client,
                            krb5_data *req_pkt,
                            krb5_kdc_req * request,
                            krb5_enc_tkt_part * enc_tkt_reply,
                            krb5_pa_data * data,
                            preauth_get_entry_data_proc server_get_entry_data,
                            void *pa_plugin_context,
                            void **pa_request_context,
                            krb5_data **e_data,
                            krb5_authdata ***authz_data)
{
    krb5_error_code retval = 0;
    krb5_octet_data authp_data = {0, 0, NULL}, krb5_authz = {0, 0, NULL};
    krb5_pa_pk_as_req *reqp = NULL;
    krb5_pa_pk_as_req_draft9 *reqp9 = NULL;
    krb5_auth_pack *auth_pack = NULL;
    krb5_auth_pack_draft9 *auth_pack9 = NULL;
    pkinit_kdc_context plgctx = NULL;
    pkinit_kdc_req_context reqctx;
    krb5_preauthtype pa_type;
    krb5_checksum cksum = {0, 0, 0, NULL};
    krb5_data *der_req = NULL;
    int valid_eku = 0, valid_san = 0;
    krb5_kdc_req *tmp_as_req = NULL;
    krb5_data k5data;
    int is_signed = 1;
    krb5_keyblock *armor_key;

    pkiDebug("pkinit_verify_padata: entered!\n");
    if (data == NULL || data->length <= 0 || data->contents == NULL)
        return 0;

    /* Remove (along with armor_key) when FAST PKINIT is settled. */
    retval = fast_kdc_get_armor_key(context, server_get_entry_data, request,
                                    client, &armor_key);
    if (retval == 0 && armor_key != NULL) {
        /* Don't allow PKINIT if the client used FAST. */
        krb5_free_keyblock(context, armor_key);
        return EINVAL;
    }

    if (pa_plugin_context == NULL || e_data == NULL)
        return EINVAL;

    plgctx = pkinit_find_realm_context(context, pa_plugin_context,
                                       request->server);
    if (plgctx == NULL)
        return 0;

#ifdef DEBUG_ASN1
    print_buffer_bin(data->contents, data->length, "/tmp/kdc_as_req");
#endif
    /* create a per-request context */
    retval = pkinit_init_kdc_req_context(context, (void **)&reqctx);
    if (retval)
        goto cleanup;
    reqctx->pa_type = data->pa_type;

    PADATA_TO_KRB5DATA(data, &k5data);

    switch ((int)data->pa_type) {
    case KRB5_PADATA_PK_AS_REQ:
        pkiDebug("processing KRB5_PADATA_PK_AS_REQ\n");
        pa_type = (int)data->pa_type;
        retval = k5int_decode_krb5_pa_pk_as_req(&k5data, &reqp);
        if (retval) {
            pkiDebug("decode_krb5_pa_pk_as_req failed\n");
            goto cleanup;
        }
#ifdef DEBUG_ASN1
        print_buffer_bin(reqp->signedAuthPack.data,
                         reqp->signedAuthPack.length,
                         "/tmp/kdc_signed_data");
#endif
        retval = cms_signeddata_verify(context, plgctx->cryptoctx,
                                       reqctx->cryptoctx, plgctx->idctx, CMS_SIGN_CLIENT,
                                       plgctx->opts->require_crl_checking,
                                       reqp->signedAuthPack.data, reqp->signedAuthPack.length,
                                       &authp_data.data, &authp_data.length, &krb5_authz.data,
                                       &krb5_authz.length, &is_signed);
        break;
    case KRB5_PADATA_PK_AS_REP_OLD:
    case KRB5_PADATA_PK_AS_REQ_OLD:
        pkiDebug("processing KRB5_PADATA_PK_AS_REQ_OLD\n");
        pa_type = KRB5_PADATA_PK_AS_REQ_OLD;
        retval = k5int_decode_krb5_pa_pk_as_req_draft9(&k5data, &reqp9);
        if (retval) {
            pkiDebug("decode_krb5_pa_pk_as_req_draft9 failed\n");
            goto cleanup;
        }
#ifdef DEBUG_ASN1
        print_buffer_bin(reqp9->signedAuthPack.data,
                         reqp9->signedAuthPack.length,
                         "/tmp/kdc_signed_data_draft9");
#endif

        retval = cms_signeddata_verify(context, plgctx->cryptoctx,
                                       reqctx->cryptoctx, plgctx->idctx, CMS_SIGN_DRAFT9,
                                       plgctx->opts->require_crl_checking,
                                       reqp9->signedAuthPack.data, reqp9->signedAuthPack.length,
                                       &authp_data.data, &authp_data.length, &krb5_authz.data,
                                       &krb5_authz.length, NULL);
        break;
    default:
        pkiDebug("unrecognized pa_type = %d\n", data->pa_type);
        retval = EINVAL;
        goto cleanup;
    }
    if (retval) {
        pkiDebug("pkcs7_signeddata_verify failed\n");
        goto cleanup;
    }
    if (is_signed) {

        retval = verify_client_san(context, plgctx, reqctx, request->client,
                                   &valid_san);
        if (retval)
            goto cleanup;
        if (!valid_san) {
            pkiDebug("%s: did not find an acceptable SAN in user "
                     "certificate\n", __FUNCTION__);
            retval = KRB5KDC_ERR_CLIENT_NAME_MISMATCH;
            goto cleanup;
        }
        retval = verify_client_eku(context, plgctx, reqctx, &valid_eku);
        if (retval)
            goto cleanup;

        if (!valid_eku) {
            pkiDebug("%s: did not find an acceptable EKU in user "
                     "certificate\n", __FUNCTION__);
            retval = KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE;
            goto cleanup;
        }
    } else { /* !is_signed */
        if (!krb5_principal_compare(context, request->client,
                                    krb5_anonymous_principal())) {
            retval = KRB5KDC_ERR_PREAUTH_FAILED;
            krb5_set_error_message(context, retval, "Pkinit request not "
                                   "signed, but client not anonymous.");
            goto cleanup;
        }
    }
#ifdef DEBUG_ASN1
    print_buffer_bin(authp_data.data, authp_data.length, "/tmp/kdc_auth_pack");
#endif

    OCTETDATA_TO_KRB5DATA(&authp_data, &k5data);
    switch ((int)data->pa_type) {
    case KRB5_PADATA_PK_AS_REQ:
        retval = k5int_decode_krb5_auth_pack(&k5data, &auth_pack);
        if (retval) {
            pkiDebug("failed to decode krb5_auth_pack\n");
            goto cleanup;
        }

        /* check dh parameters */
        if (auth_pack->clientPublicValue != NULL) {
            retval = server_check_dh(context, plgctx->cryptoctx,
                                     reqctx->cryptoctx, plgctx->idctx,
                                     &auth_pack->clientPublicValue->algorithm.parameters,
                                     plgctx->opts->dh_min_bits);

            if (retval) {
                pkiDebug("bad dh parameters\n");
                goto cleanup;
            }
        } else if (!is_signed) {
            /*Anonymous pkinit requires DH*/
            retval = KRB5KDC_ERR_PREAUTH_FAILED;
            krb5_set_error_message(context, retval, "Anonymous pkinit without DH public value not supported.");
            goto cleanup;
        }
        /*
         * The KDC may have modified the request after decoding it.
         * We need to compute the checksum on the data that
         * came from the client.  Therefore, we use the original
         * packet contents.
         */
        retval = k5int_decode_krb5_as_req(req_pkt, &tmp_as_req);
        if (retval) {
            pkiDebug("decode_krb5_as_req returned %d\n", (int)retval);
            goto cleanup;
        }

        retval = k5int_encode_krb5_kdc_req_body(tmp_as_req, &der_req);
        if (retval) {
            pkiDebug("encode_krb5_kdc_req_body returned %d\n", (int) retval);
            goto cleanup;
        }
        retval = krb5_c_make_checksum(context, CKSUMTYPE_NIST_SHA, NULL,
                                      0, der_req, &cksum);
        if (retval) {
            pkiDebug("unable to calculate AS REQ checksum\n");
            goto cleanup;
        }
        if (cksum.length != auth_pack->pkAuthenticator.paChecksum.length ||
            memcmp(cksum.contents,
                   auth_pack->pkAuthenticator.paChecksum.contents,
                   cksum.length)) {
            pkiDebug("failed to match the checksum\n");
#ifdef DEBUG_CKSUM
            pkiDebug("calculating checksum on buf size (%d)\n",
                     req_pkt->length);
            print_buffer(req_pkt->data, req_pkt->length);
            pkiDebug("received checksum type=%d size=%d ",
                     auth_pack->pkAuthenticator.paChecksum.checksum_type,
                     auth_pack->pkAuthenticator.paChecksum.length);
            print_buffer(auth_pack->pkAuthenticator.paChecksum.contents,
                         auth_pack->pkAuthenticator.paChecksum.length);
            pkiDebug("expected checksum type=%d size=%d ",
                     cksum.checksum_type, cksum.length);
            print_buffer(cksum.contents, cksum.length);
#endif

            retval = KRB5KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED;
            goto cleanup;
        }

        /* check if kdcPkId present and match KDC's subjectIdentifier */
        if (reqp->kdcPkId.data != NULL) {
            int valid_kdcPkId = 0;
            retval = pkinit_check_kdc_pkid(context, plgctx->cryptoctx,
                                           reqctx->cryptoctx, plgctx->idctx,
                                           reqp->kdcPkId.data, reqp->kdcPkId.length, &valid_kdcPkId);
            if (retval)
                goto cleanup;
            if (!valid_kdcPkId)
                pkiDebug("kdcPkId in AS_REQ does not match KDC's cert"
                         "RFC says to ignore and proceed\n");

        }
        /* remember the decoded auth_pack for verify_padata routine */
        reqctx->rcv_auth_pack = auth_pack;
        auth_pack = NULL;
        break;
    case KRB5_PADATA_PK_AS_REP_OLD:
    case KRB5_PADATA_PK_AS_REQ_OLD:
        retval = k5int_decode_krb5_auth_pack_draft9(&k5data, &auth_pack9);
        if (retval) {
            pkiDebug("failed to decode krb5_auth_pack_draft9\n");
            goto cleanup;
        }
        if (auth_pack9->clientPublicValue != NULL) {
            retval = server_check_dh(context, plgctx->cryptoctx,
                                     reqctx->cryptoctx, plgctx->idctx,
                                     &auth_pack9->clientPublicValue->algorithm.parameters,
                                     plgctx->opts->dh_min_bits);

            if (retval) {
                pkiDebug("bad dh parameters\n");
                goto cleanup;
            }
        }
        /* remember the decoded auth_pack for verify_padata routine */
        reqctx->rcv_auth_pack9 = auth_pack9;
        auth_pack9 = NULL;
        break;
    }

    /*
     * This code used to generate ad-initial-verified-cas authorization data.
     * However that has been removed until the ad-kdc-issued discussion can
     * happen in the working group.  Dec 2009
     */
    /* return authorization data to be included in the ticket */
    switch ((int)data->pa_type) {
    default:
        *authz_data = NULL;
    }
    /* remember to set the PREAUTH flag in the reply */
    enc_tkt_reply->flags |= TKT_FLG_PRE_AUTH;
    *pa_request_context = reqctx;
    reqctx = NULL;

cleanup:
    if (retval && data->pa_type == KRB5_PADATA_PK_AS_REQ) {
        pkiDebug("pkinit_verify_padata failed: creating e-data\n");
        if (pkinit_create_edata(context, plgctx->cryptoctx, reqctx->cryptoctx,
                                plgctx->idctx, plgctx->opts, retval, e_data))
            pkiDebug("pkinit_create_edata failed\n");
    }

    switch ((int)data->pa_type) {
    case KRB5_PADATA_PK_AS_REQ:
        free_krb5_pa_pk_as_req(&reqp);
        free(cksum.contents);
        if (der_req != NULL)
            krb5_free_data(context, der_req);
        break;
    case KRB5_PADATA_PK_AS_REP_OLD:
    case KRB5_PADATA_PK_AS_REQ_OLD:
        free_krb5_pa_pk_as_req_draft9(&reqp9);
    }
    if (tmp_as_req != NULL)
        k5int_krb5_free_kdc_req(context, tmp_as_req);
    free(authp_data.data);
    free(krb5_authz.data);
    if (reqctx != NULL)
        pkinit_fini_kdc_req_context(context, reqctx);
    if (auth_pack != NULL)
        free_krb5_auth_pack(&auth_pack);
    if (auth_pack9 != NULL)
        free_krb5_auth_pack_draft9(context, &auth_pack9);

    return retval;
}
Exemplo n.º 4
0
/*ARGSUSED*/
krb5_error_code
process_tgs_req(struct server_handle *handle, krb5_data *pkt,
                const krb5_fulladdr *from, krb5_data **response)
{
    krb5_keyblock * subkey = 0;
    krb5_keyblock *header_key = NULL;
    krb5_kdc_req *request = 0;
    krb5_db_entry *server = NULL;
    krb5_db_entry *stkt_server = NULL;
    krb5_kdc_rep reply;
    krb5_enc_kdc_rep_part reply_encpart;
    krb5_ticket ticket_reply, *header_ticket = 0;
    int st_idx = 0;
    krb5_enc_tkt_part enc_tkt_reply;
    int newtransited = 0;
    krb5_error_code retval = 0;
    krb5_keyblock encrypting_key;
    krb5_timestamp kdc_time, authtime = 0;
    krb5_keyblock session_key;
    krb5_keyblock *reply_key = NULL;
    krb5_key_data  *server_key;
    krb5_principal cprinc = NULL, sprinc = NULL, altcprinc = NULL;
    krb5_last_req_entry *nolrarray[2], nolrentry;
    int errcode;
    const char        *status = 0;
    krb5_enc_tkt_part *header_enc_tkt = NULL; /* TGT */
    krb5_enc_tkt_part *subject_tkt = NULL; /* TGT or evidence ticket */
    krb5_db_entry *client = NULL, *header_server = NULL;
    krb5_db_entry *local_tgt, *local_tgt_storage = NULL;
    krb5_pa_s4u_x509_user *s4u_x509_user = NULL; /* protocol transition request */
    krb5_authdata **kdc_issued_auth_data = NULL; /* auth data issued by KDC */
    unsigned int c_flags = 0, s_flags = 0;       /* client/server KDB flags */
    krb5_boolean is_referral;
    const char *emsg = NULL;
    krb5_kvno ticket_kvno = 0;
    struct kdc_request_state *state = NULL;
    krb5_pa_data *pa_tgs_req; /*points into request*/
    krb5_data scratch;
    krb5_pa_data **e_data = NULL;
    kdc_realm_t *kdc_active_realm = NULL;
    krb5_audit_state *au_state = NULL;
    krb5_data **auth_indicators = NULL;

    memset(&reply, 0, sizeof(reply));
    memset(&reply_encpart, 0, sizeof(reply_encpart));
    memset(&ticket_reply, 0, sizeof(ticket_reply));
    memset(&enc_tkt_reply, 0, sizeof(enc_tkt_reply));
    session_key.contents = NULL;

    retval = decode_krb5_tgs_req(pkt, &request);
    if (retval)
        return retval;
    /* Save pointer to client-requested service principal, in case of
     * errors before a successful call to search_sprinc(). */
    sprinc = request->server;

    if (request->msg_type != KRB5_TGS_REQ) {
        krb5_free_kdc_req(handle->kdc_err_context, request);
        return KRB5_BADMSGTYPE;
    }

    /*
     * setup_server_realm() sets up the global realm-specific data pointer.
     */
    kdc_active_realm = setup_server_realm(handle, request->server);
    if (kdc_active_realm == NULL) {
        krb5_free_kdc_req(handle->kdc_err_context, request);
        return KRB5KDC_ERR_WRONG_REALM;
    }
    errcode = kdc_make_rstate(kdc_active_realm, &state);
    if (errcode !=0) {
        krb5_free_kdc_req(handle->kdc_err_context, request);
        return errcode;
    }

    /* Initialize audit state. */
    errcode = kau_init_kdc_req(kdc_context, request, from, &au_state);
    if (errcode) {
        krb5_free_kdc_req(handle->kdc_err_context, request);
        return errcode;
    }
    /* Seed the audit trail with the request ID and basic information. */
    kau_tgs_req(kdc_context, TRUE, au_state);

    errcode = kdc_process_tgs_req(kdc_active_realm,
                                  request, from, pkt, &header_ticket,
                                  &header_server, &header_key, &subkey,
                                  &pa_tgs_req);
    if (header_ticket && header_ticket->enc_part2)
        cprinc = header_ticket->enc_part2->client;

    if (errcode) {
        status = "PROCESS_TGS";
        goto cleanup;
    }

    if (!header_ticket) {
        errcode = KRB5_NO_TKT_SUPPLIED;        /* XXX? */
        status="UNEXPECTED NULL in header_ticket";
        goto cleanup;
    }
    errcode = kau_make_tkt_id(kdc_context, header_ticket,
                              &au_state->tkt_in_id);
    if (errcode) {
        status = "GENERATE_TICKET_ID";
        goto cleanup;
    }

    scratch.length = pa_tgs_req->length;
    scratch.data = (char *) pa_tgs_req->contents;
    errcode = kdc_find_fast(&request, &scratch, subkey,
                            header_ticket->enc_part2->session, state, NULL);
    /* Reset sprinc because kdc_find_fast() can replace request. */
    sprinc = request->server;
    if (errcode !=0) {
        status = "FIND_FAST";
        goto cleanup;
    }

    errcode = get_local_tgt(kdc_context, &sprinc->realm, header_server,
                            &local_tgt, &local_tgt_storage);
    if (errcode) {
        status = "GET_LOCAL_TGT";
        goto cleanup;
    }

    /* Ignore (for now) the request modification due to FAST processing. */
    au_state->request = request;

    /*
     * Pointer to the encrypted part of the header ticket, which may be
     * replaced to point to the encrypted part of the evidence ticket
     * if constrained delegation is used. This simplifies the number of
     * special cases for constrained delegation.
     */
    header_enc_tkt = header_ticket->enc_part2;

    /*
     * We've already dealt with the AP_REQ authentication, so we can
     * use header_ticket freely.  The encrypted part (if any) has been
     * decrypted with the session key.
     */

    au_state->stage = SRVC_PRINC;

    /* XXX make sure server here has the proper realm...taken from AP_REQ
       header? */

    setflag(s_flags, KRB5_KDB_FLAG_ALIAS_OK);
    if (isflagset(request->kdc_options, KDC_OPT_CANONICALIZE)) {
        setflag(c_flags, KRB5_KDB_FLAG_CANONICALIZE);
        setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
    }

    errcode = search_sprinc(kdc_active_realm, request, s_flags, &server,
                            &status);
    if (errcode != 0)
        goto cleanup;
    sprinc = server->princ;

    /* If we got a cross-realm TGS which is not the requested server, we are
     * issuing a referral (or alternate TGT, which we treat similarly). */
    is_referral = is_cross_tgs_principal(server->princ) &&
        !krb5_principal_compare(kdc_context, request->server, server->princ);

    au_state->stage = VALIDATE_POL;

    if ((errcode = krb5_timeofday(kdc_context, &kdc_time))) {
        status = "TIME_OF_DAY";
        goto cleanup;
    }

    if ((retval = validate_tgs_request(kdc_active_realm,
                                       request, *server, header_ticket,
                                       kdc_time, &status, &e_data))) {
        if (!status)
            status = "UNKNOWN_REASON";
        if (retval == KDC_ERR_POLICY || retval == KDC_ERR_BADOPTION)
            au_state->violation = PROT_CONSTRAINT;
        errcode = retval + ERROR_TABLE_BASE_krb5;
        goto cleanup;
    }

    if (!is_local_principal(kdc_active_realm, header_enc_tkt->client))
        setflag(c_flags, KRB5_KDB_FLAG_CROSS_REALM);

    /* Check for protocol transition */
    errcode = kdc_process_s4u2self_req(kdc_active_realm,
                                       request,
                                       header_enc_tkt->client,
                                       server,
                                       subkey,
                                       header_enc_tkt->session,
                                       kdc_time,
                                       &s4u_x509_user,
                                       &client,
                                       &status);
    if (s4u_x509_user != NULL || errcode != 0) {
        if (s4u_x509_user != NULL)
            au_state->s4u2self_user = s4u_x509_user->user_id.user;
        if (errcode == KDC_ERR_POLICY || errcode == KDC_ERR_BADOPTION)
            au_state->violation = PROT_CONSTRAINT;
        au_state->status = status;
        kau_s4u2self(kdc_context, errcode ? FALSE : TRUE, au_state);
        au_state->s4u2self_user = NULL;
    }

    if (errcode)
        goto cleanup;
    if (s4u_x509_user != NULL) {
        setflag(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION);
        if (is_referral) {
            /* The requesting server appears to no longer exist, and we found
             * a referral instead.  Treat this as a server lookup failure. */
            errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
            status = "LOOKING_UP_SERVER";
            goto cleanup;
        }
    }

    /* Deal with user-to-user and constrained delegation */
    errcode = decrypt_2ndtkt(kdc_active_realm, request, c_flags,
                             &stkt_server, &status);
    if (errcode)
        goto cleanup;

    if (isflagset(request->kdc_options, KDC_OPT_CNAME_IN_ADDL_TKT)) {
        /* Do constrained delegation protocol and authorization checks */
        errcode = kdc_process_s4u2proxy_req(kdc_active_realm,
                                            request,
                                            request->second_ticket[st_idx]->enc_part2,
                                            stkt_server,
                                            header_ticket->enc_part2->client,
                                            request->server,
                                            &status);
        if (errcode == KDC_ERR_POLICY || errcode == KDC_ERR_BADOPTION)
            au_state->violation = PROT_CONSTRAINT;
        else if (errcode)
            au_state->violation = LOCAL_POLICY;
        au_state->status = status;
        retval = kau_make_tkt_id(kdc_context, request->second_ticket[st_idx],
                                  &au_state->evid_tkt_id);
        if (retval) {
            status = "GENERATE_TICKET_ID";
            errcode = retval;
            goto cleanup;
        }
        kau_s4u2proxy(kdc_context, errcode ? FALSE : TRUE, au_state);
        if (errcode)
            goto cleanup;

        setflag(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION);

        assert(krb5_is_tgs_principal(header_ticket->server));

        assert(client == NULL); /* assured by kdc_process_s4u2self_req() */
        client = stkt_server;
        stkt_server = NULL;
    } else if (request->kdc_options & KDC_OPT_ENC_TKT_IN_SKEY) {
        krb5_db_free_principal(kdc_context, stkt_server);
        stkt_server = NULL;
    } else
        assert(stkt_server == NULL);

    au_state->stage = ISSUE_TKT;

    errcode = gen_session_key(kdc_active_realm, request, server, &session_key,
                              &status);
    if (errcode)
        goto cleanup;

    /*
     * subject_tkt will refer to the evidence ticket (for constrained
     * delegation) or the TGT. The distinction from header_enc_tkt is
     * necessary because the TGS signature only protects some fields:
     * the others could be forged by a malicious server.
     */

    if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION))
        subject_tkt = request->second_ticket[st_idx]->enc_part2;
    else
        subject_tkt = header_enc_tkt;
    authtime = subject_tkt->times.authtime;

    /* Extract auth indicators from the subject ticket, except for S4U2Proxy
     * requests (where the client didn't authenticate). */
    if (s4u_x509_user == NULL) {
        errcode = get_auth_indicators(kdc_context, subject_tkt, local_tgt,
                                      &auth_indicators);
        if (errcode) {
            status = "GET_AUTH_INDICATORS";
            goto cleanup;
        }
    }

    errcode = check_indicators(kdc_context, server, auth_indicators);
    if (errcode) {
        status = "HIGHER_AUTHENTICATION_REQUIRED";
        goto cleanup;
    }

    if (is_referral)
        ticket_reply.server = server->princ;
    else
        ticket_reply.server = request->server; /* XXX careful for realm... */

    enc_tkt_reply.flags = OPTS2FLAGS(request->kdc_options);
    enc_tkt_reply.flags |= COPY_TKT_FLAGS(header_enc_tkt->flags);
    enc_tkt_reply.times.starttime = 0;

    if (isflagset(server->attributes, KRB5_KDB_OK_AS_DELEGATE))
        setflag(enc_tkt_reply.flags, TKT_FLG_OK_AS_DELEGATE);

    /* Indicate support for encrypted padata (RFC 6806). */
    setflag(enc_tkt_reply.flags, TKT_FLG_ENC_PA_REP);

    /* don't use new addresses unless forwarded, see below */

    enc_tkt_reply.caddrs = header_enc_tkt->caddrs;
    /* noaddrarray[0] = 0; */
    reply_encpart.caddrs = 0;/* optional...don't put it in */
    reply_encpart.enc_padata = NULL;

    /*
     * It should be noted that local policy may affect the
     * processing of any of these flags.  For example, some
     * realms may refuse to issue renewable tickets
     */

    if (isflagset(request->kdc_options, KDC_OPT_FORWARDABLE)) {

        if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION)) {
            /*
             * If S4U2Self principal is not forwardable, then mark ticket as
             * unforwardable. This behaviour matches Windows, but it is
             * different to the MIT AS-REQ path, which returns an error
             * (KDC_ERR_POLICY) if forwardable tickets cannot be issued.
             *
             * Consider this block the S4U2Self equivalent to
             * validate_forwardable().
             */
            if (client != NULL &&
                isflagset(client->attributes, KRB5_KDB_DISALLOW_FORWARDABLE))
                clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
            /*
             * Forwardable flag is propagated along referral path.
             */
            else if (!isflagset(header_enc_tkt->flags, TKT_FLG_FORWARDABLE))
                clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
            /*
             * OK_TO_AUTH_AS_DELEGATE must be set on the service requesting
             * S4U2Self in order for forwardable tickets to be returned.
             */
            else if (!is_referral &&
                     !isflagset(server->attributes,
                                KRB5_KDB_OK_TO_AUTH_AS_DELEGATE))
                clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
        }
    }

    if (isflagset(request->kdc_options, KDC_OPT_FORWARDED) ||
        isflagset(request->kdc_options, KDC_OPT_PROXY)) {

        /* include new addresses in ticket & reply */

        enc_tkt_reply.caddrs = request->addresses;
        reply_encpart.caddrs = request->addresses;
    }
    /* We don't currently handle issuing anonymous tickets based on
     * non-anonymous ones, so just ignore the option. */
    if (isflagset(request->kdc_options, KDC_OPT_REQUEST_ANONYMOUS) &&
        !isflagset(header_enc_tkt->flags, TKT_FLG_ANONYMOUS))
        clear(enc_tkt_reply.flags, TKT_FLG_ANONYMOUS);

    if (isflagset(request->kdc_options, KDC_OPT_POSTDATED)) {
        setflag(enc_tkt_reply.flags, TKT_FLG_INVALID);
        enc_tkt_reply.times.starttime = request->from;
    } else
        enc_tkt_reply.times.starttime = kdc_time;

    if (isflagset(request->kdc_options, KDC_OPT_VALIDATE)) {
        assert(isflagset(c_flags, KRB5_KDB_FLAGS_S4U) == 0);
        /* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
           to the caller */
        ticket_reply = *(header_ticket);
        enc_tkt_reply = *(header_ticket->enc_part2);
        enc_tkt_reply.authorization_data = NULL;
        clear(enc_tkt_reply.flags, TKT_FLG_INVALID);
    }

    if (isflagset(request->kdc_options, KDC_OPT_RENEW)) {
        krb5_timestamp old_starttime;
        krb5_deltat old_life;

        assert(isflagset(c_flags, KRB5_KDB_FLAGS_S4U) == 0);
        /* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
           to the caller */
        ticket_reply = *(header_ticket);
        enc_tkt_reply = *(header_ticket->enc_part2);
        enc_tkt_reply.authorization_data = NULL;

        old_starttime = enc_tkt_reply.times.starttime ?
            enc_tkt_reply.times.starttime : enc_tkt_reply.times.authtime;
        old_life = enc_tkt_reply.times.endtime - old_starttime;

        enc_tkt_reply.times.starttime = kdc_time;
        enc_tkt_reply.times.endtime =
            min(header_ticket->enc_part2->times.renew_till,
                kdc_time + old_life);
    } else {
        /* not a renew request */
        enc_tkt_reply.times.starttime = kdc_time;

        kdc_get_ticket_endtime(kdc_active_realm, enc_tkt_reply.times.starttime,
                               header_enc_tkt->times.endtime, request->till,
                               client, server, &enc_tkt_reply.times.endtime);
    }

    kdc_get_ticket_renewtime(kdc_active_realm, request, header_enc_tkt, client,
                             server, &enc_tkt_reply);

    /*
     * Set authtime to be the same as header or evidence ticket's
     */
    enc_tkt_reply.times.authtime = authtime;

    /* starttime is optional, and treated as authtime if not present.
       so we can nuke it if it matches */
    if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
        enc_tkt_reply.times.starttime = 0;

    if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION)) {
        altcprinc = s4u_x509_user->user_id.user;
    } else if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION)) {
        altcprinc = subject_tkt->client;
    } else {
        altcprinc = NULL;
    }
    if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY)) {
        krb5_enc_tkt_part *t2enc = request->second_ticket[st_idx]->enc_part2;
        encrypting_key = *(t2enc->session);
    } else {
        /*
         * Find the server key
         */
        if ((errcode = krb5_dbe_find_enctype(kdc_context, server,
                                             -1, /* ignore keytype */
                                             -1, /* Ignore salttype */
                                             0,  /* Get highest kvno */
                                             &server_key))) {
            status = "FINDING_SERVER_KEY";
            goto cleanup;
        }

        /*
         * Convert server.key into a real key
         * (it may be encrypted in the database)
         */
        if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
                                                 server_key, &encrypting_key,
                                                 NULL))) {
            status = "DECRYPT_SERVER_KEY";
            goto cleanup;
        }
    }

    if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION)) {
        /*
         * Don't allow authorization data to be disabled if constrained
         * delegation is requested. We don't want to deny the server
         * the ability to validate that delegation was used.
         */
        clear(server->attributes, KRB5_KDB_NO_AUTH_DATA_REQUIRED);
    }
    if (isflagset(server->attributes, KRB5_KDB_NO_AUTH_DATA_REQUIRED) == 0) {
        /*
         * If we are not doing protocol transition/constrained delegation
         * try to lookup the client principal so plugins can add additional
         * authorization information.
         *
         * Always validate authorization data for constrained delegation
         * because we must validate the KDC signatures.
         */
        if (!isflagset(c_flags, KRB5_KDB_FLAGS_S4U)) {
            /* Generate authorization data so we can include it in ticket */
            setflag(c_flags, KRB5_KDB_FLAG_INCLUDE_PAC);
            /* Map principals from foreign (possibly non-AD) realms */
            setflag(c_flags, KRB5_KDB_FLAG_MAP_PRINCIPALS);

            assert(client == NULL); /* should not have been set already */

            errcode = krb5_db_get_principal(kdc_context, subject_tkt->client,
                                            c_flags, &client);
        }
    }

    if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION) &&
        !isflagset(c_flags, KRB5_KDB_FLAG_CROSS_REALM))
        enc_tkt_reply.client = s4u_x509_user->user_id.user;
    else
        enc_tkt_reply.client = subject_tkt->client;

    enc_tkt_reply.session = &session_key;
    enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
    enc_tkt_reply.transited.tr_contents = empty_string; /* equivalent of "" */

    /*
     * Only add the realm of the presented tgt to the transited list if
     * it is different than the local realm (cross-realm) and it is different
     * than the realm of the client (since the realm of the client is already
     * implicitly part of the transited list and should not be explicitly
     * listed).
     */
    /* realm compare is like strcmp, but knows how to deal with these args */
    if (krb5_realm_compare(kdc_context, header_ticket->server, tgs_server) ||
        krb5_realm_compare(kdc_context, header_ticket->server,
                           enc_tkt_reply.client)) {
        /* tgt issued by local realm or issued by realm of client */
        enc_tkt_reply.transited = header_enc_tkt->transited;
    } else {
        /* tgt issued by some other realm and not the realm of the client */
        /* assemble new transited field into allocated storage */
        if (header_enc_tkt->transited.tr_type !=
            KRB5_DOMAIN_X500_COMPRESS) {
            status = "VALIDATE_TRANSIT_TYPE";
            errcode = KRB5KDC_ERR_TRTYPE_NOSUPP;
            goto cleanup;
        }
        memset(&enc_tkt_reply.transited, 0, sizeof(enc_tkt_reply.transited));
        enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
        if ((errcode =
             add_to_transited(&header_enc_tkt->transited.tr_contents,
                              &enc_tkt_reply.transited.tr_contents,
                              header_ticket->server,
                              enc_tkt_reply.client,
                              request->server))) {
            status = "ADD_TO_TRANSITED_LIST";
            goto cleanup;
        }
        newtransited = 1;
    }
    if (isflagset(c_flags, KRB5_KDB_FLAG_CROSS_REALM)) {
        errcode = validate_transit_path(kdc_context, header_enc_tkt->client,
                                        server, header_server);
        if (errcode) {
            status = "NON_TRANSITIVE";
            goto cleanup;
        }
    }
    if (!isflagset (request->kdc_options, KDC_OPT_DISABLE_TRANSITED_CHECK)) {
        errcode = kdc_check_transited_list (kdc_active_realm,
                                            &enc_tkt_reply.transited.tr_contents,
                                            krb5_princ_realm (kdc_context, header_enc_tkt->client),
                                            krb5_princ_realm (kdc_context, request->server));
        if (errcode == 0) {
            setflag (enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED);
        } else {
            log_tgs_badtrans(kdc_context, cprinc, sprinc,
                             &enc_tkt_reply.transited.tr_contents, errcode);
        }
    } else
        krb5_klog_syslog(LOG_INFO, _("not checking transit path"));
    if (kdc_active_realm->realm_reject_bad_transit &&
        !isflagset(enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED)) {
        errcode = KRB5KDC_ERR_POLICY;
        status = "BAD_TRANSIT";
        au_state->violation = LOCAL_POLICY;
        goto cleanup;
    }

    errcode = handle_authdata(kdc_context, c_flags, client, server,
                              header_server, local_tgt,
                              subkey != NULL ? subkey :
                              header_ticket->enc_part2->session,
                              &encrypting_key, /* U2U or server key */
                              header_key,
                              pkt,
                              request,
                              s4u_x509_user ?
                              s4u_x509_user->user_id.user : NULL,
                              subject_tkt,
                              auth_indicators,
                              &enc_tkt_reply);
    if (errcode) {
        krb5_klog_syslog(LOG_INFO, _("TGS_REQ : handle_authdata (%d)"),
                         errcode);
        status = "HANDLE_AUTHDATA";
        goto cleanup;
    }

    ticket_reply.enc_part2 = &enc_tkt_reply;

    /*
     * If we are doing user-to-user authentication, then make sure
     * that the client for the second ticket matches the request
     * server, and then encrypt the ticket using the session key of
     * the second ticket.
     */
    if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY)) {
        /*
         * Make sure the client for the second ticket matches
         * requested server.
         */
        krb5_enc_tkt_part *t2enc = request->second_ticket[st_idx]->enc_part2;
        krb5_principal client2 = t2enc->client;
        if (!krb5_principal_compare(kdc_context, request->server, client2)) {
            altcprinc = client2;
            errcode = KRB5KDC_ERR_SERVER_NOMATCH;
            status = "2ND_TKT_MISMATCH";
            au_state->status = status;
            kau_u2u(kdc_context, FALSE, au_state);
            goto cleanup;
        }

        ticket_kvno = 0;
        ticket_reply.enc_part.enctype = t2enc->session->enctype;
        kau_u2u(kdc_context, TRUE, au_state);
        st_idx++;
    } else {
        ticket_kvno = server_key->key_data_kvno;
    }

    errcode = krb5_encrypt_tkt_part(kdc_context, &encrypting_key,
                                    &ticket_reply);
    if (!isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY))
        krb5_free_keyblock_contents(kdc_context, &encrypting_key);
    if (errcode) {
        status = "ENCRYPT_TICKET";
        goto cleanup;
    }
    ticket_reply.enc_part.kvno = ticket_kvno;
    /* Start assembling the response */
    au_state->stage = ENCR_REP;
    reply.msg_type = KRB5_TGS_REP;
    if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION) &&
        krb5int_find_pa_data(kdc_context, request->padata,
                             KRB5_PADATA_S4U_X509_USER) != NULL) {
        errcode = kdc_make_s4u2self_rep(kdc_context,
                                        subkey,
                                        header_ticket->enc_part2->session,
                                        s4u_x509_user,
                                        &reply,
                                        &reply_encpart);
        if (errcode) {
            status = "MAKE_S4U2SELF_PADATA";
            au_state->status = status;
        }
        kau_s4u2self(kdc_context, errcode ? FALSE : TRUE, au_state);
        if (errcode)
            goto cleanup;
    }

    reply.client = enc_tkt_reply.client;
    reply.enc_part.kvno = 0;/* We are using the session key */
    reply.ticket = &ticket_reply;

    reply_encpart.session = &session_key;
    reply_encpart.nonce = request->nonce;

    /* copy the time fields */
    reply_encpart.times = enc_tkt_reply.times;

    nolrentry.lr_type = KRB5_LRQ_NONE;
    nolrentry.value = 0;
    nolrentry.magic = 0;
    nolrarray[0] = &nolrentry;
    nolrarray[1] = 0;
    reply_encpart.last_req = nolrarray;        /* not available for TGS reqs */
    reply_encpart.key_exp = 0;/* ditto */
    reply_encpart.flags = enc_tkt_reply.flags;
    reply_encpart.server = ticket_reply.server;

    /* use the session key in the ticket, unless there's a subsession key
       in the AP_REQ */
    reply.enc_part.enctype = subkey ? subkey->enctype :
        header_ticket->enc_part2->session->enctype;
    errcode  = kdc_fast_response_handle_padata(state, request, &reply,
                                               subkey ? subkey->enctype : header_ticket->enc_part2->session->enctype);
    if (errcode !=0 ) {
        status = "MAKE_FAST_RESPONSE";
        goto cleanup;
    }
    errcode =kdc_fast_handle_reply_key(state,
                                       subkey?subkey:header_ticket->enc_part2->session, &reply_key);
    if (errcode) {
        status  = "MAKE_FAST_REPLY_KEY";
        goto cleanup;
    }
    errcode = return_enc_padata(kdc_context, pkt, request,
                                reply_key, server, &reply_encpart,
                                is_referral &&
                                isflagset(s_flags,
                                          KRB5_KDB_FLAG_CANONICALIZE));
    if (errcode) {
        status = "KDC_RETURN_ENC_PADATA";
        goto cleanup;
    }

    errcode = kau_make_tkt_id(kdc_context, &ticket_reply, &au_state->tkt_out_id);
    if (errcode) {
        status = "GENERATE_TICKET_ID";
        goto cleanup;
    }

    if (kdc_fast_hide_client(state))
        reply.client = (krb5_principal)krb5_anonymous_principal();
    errcode = krb5_encode_kdc_rep(kdc_context, KRB5_TGS_REP, &reply_encpart,
                                  subkey ? 1 : 0,
                                  reply_key,
                                  &reply, response);
    if (errcode) {
        status = "ENCODE_KDC_REP";
    } else {
        status = "ISSUE";
    }

    memset(ticket_reply.enc_part.ciphertext.data, 0,
           ticket_reply.enc_part.ciphertext.length);
    free(ticket_reply.enc_part.ciphertext.data);
    /* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
       can use them in raw form if needed.  But, we don't... */
    memset(reply.enc_part.ciphertext.data, 0,
           reply.enc_part.ciphertext.length);
    free(reply.enc_part.ciphertext.data);

cleanup:
    assert(status != NULL);
    if (reply_key)
        krb5_free_keyblock(kdc_context, reply_key);
    if (errcode)
        emsg = krb5_get_error_message (kdc_context, errcode);

    au_state->status = status;
    if (!errcode)
        au_state->reply = &reply;
    kau_tgs_req(kdc_context, errcode ? FALSE : TRUE, au_state);
    kau_free_kdc_req(au_state);

    log_tgs_req(kdc_context, from, request, &reply, cprinc,
                sprinc, altcprinc, authtime,
                c_flags, status, errcode, emsg);
    if (errcode) {
        krb5_free_error_message (kdc_context, emsg);
        emsg = NULL;
    }

    if (errcode) {
        int got_err = 0;
        if (status == 0) {
            status = krb5_get_error_message (kdc_context, errcode);
            got_err = 1;
        }
        errcode -= ERROR_TABLE_BASE_krb5;
        if (errcode < 0 || errcode > KRB_ERR_MAX)
            errcode = KRB_ERR_GENERIC;

        retval = prepare_error_tgs(state, request, header_ticket, errcode,
                                   (server != NULL) ? server->princ : NULL,
                                   response, status, e_data);
        if (got_err) {
            krb5_free_error_message (kdc_context, status);
            status = 0;
        }
    }

    if (header_ticket != NULL)
        krb5_free_ticket(kdc_context, header_ticket);
    if (request != NULL)
        krb5_free_kdc_req(kdc_context, request);
    if (state)
        kdc_free_rstate(state);
    krb5_db_free_principal(kdc_context, server);
    krb5_db_free_principal(kdc_context, header_server);
    krb5_db_free_principal(kdc_context, client);
    krb5_db_free_principal(kdc_context, local_tgt_storage);
    if (session_key.contents != NULL)
        krb5_free_keyblock_contents(kdc_context, &session_key);
    if (newtransited)
        free(enc_tkt_reply.transited.tr_contents.data);
    if (s4u_x509_user != NULL)
        krb5_free_pa_s4u_x509_user(kdc_context, s4u_x509_user);
    if (kdc_issued_auth_data != NULL)
        krb5_free_authdata(kdc_context, kdc_issued_auth_data);
    if (subkey != NULL)
        krb5_free_keyblock(kdc_context, subkey);
    if (header_key != NULL)
        krb5_free_keyblock(kdc_context, header_key);
    if (reply.padata)
        krb5_free_pa_data(kdc_context, reply.padata);
    if (reply_encpart.enc_padata)
        krb5_free_pa_data(kdc_context, reply_encpart.enc_padata);
    if (enc_tkt_reply.authorization_data != NULL)
        krb5_free_authdata(kdc_context, enc_tkt_reply.authorization_data);
    krb5_free_pa_data(kdc_context, e_data);
    k5_free_data_ptr_list(auth_indicators);

    return retval;
}
Exemplo n.º 5
0
static krb5_error_code
prepare_error_tgs (struct kdc_request_state *state,
                   krb5_kdc_req *request, krb5_ticket *ticket, int error,
                   krb5_principal canon_server,
                   krb5_data **response, const char *status,
                   krb5_pa_data **e_data)
{
    krb5_error errpkt;
    krb5_error_code retval = 0;
    krb5_data *scratch, *e_data_asn1 = NULL, *fast_edata = NULL;
    kdc_realm_t *kdc_active_realm = state->realm_data;

    errpkt.ctime = request->nonce;
    errpkt.cusec = 0;

    if ((retval = krb5_us_timeofday(kdc_context, &errpkt.stime,
                                    &errpkt.susec)))
        return(retval);
    errpkt.error = error;
    errpkt.server = request->server;
    if (ticket && ticket->enc_part2)
        errpkt.client = ticket->enc_part2->client;
    else
        errpkt.client = NULL;
    errpkt.text.length = strlen(status);
    if (!(errpkt.text.data = strdup(status)))
        return ENOMEM;

    if (!(scratch = (krb5_data *)malloc(sizeof(*scratch)))) {
        free(errpkt.text.data);
        return ENOMEM;
    }

    if (e_data != NULL) {
        retval = encode_krb5_padata_sequence(e_data, &e_data_asn1);
        if (retval) {
            free(scratch);
            free(errpkt.text.data);
            return retval;
        }
        errpkt.e_data = *e_data_asn1;
    } else
        errpkt.e_data = empty_data();

    retval = kdc_fast_handle_error(kdc_context, state, request, e_data,
                                   &errpkt, &fast_edata);
    if (retval) {
        free(scratch);
        free(errpkt.text.data);
        krb5_free_data(kdc_context, e_data_asn1);
        return retval;
    }
    if (fast_edata)
        errpkt.e_data = *fast_edata;
    if (kdc_fast_hide_client(state) && errpkt.client != NULL)
        errpkt.client = (krb5_principal)krb5_anonymous_principal();
    retval = krb5_mk_error(kdc_context, &errpkt, scratch);
    free(errpkt.text.data);
    krb5_free_data(kdc_context, e_data_asn1);
    krb5_free_data(kdc_context, fast_edata);
    if (retval)
        free(scratch);
    else
        *response = scratch;

    return retval;
}
Exemplo n.º 6
0
/*ARGSUSED*/
void
process_as_req(krb5_kdc_req *request, krb5_data *req_pkt,
               const krb5_fulladdr *from, kdc_realm_t *kdc_active_realm,
               verto_ctx *vctx, loop_respond_fn respond, void *arg)
{
    krb5_error_code errcode;
    krb5_timestamp rtime;
    unsigned int s_flags = 0;
    krb5_data encoded_req_body;
    krb5_enctype useenctype;
    struct as_req_state *state;

    state = k5alloc(sizeof(*state), &errcode);
    if (state == NULL) {
        (*respond)(arg, errcode, NULL);
        return;
    }
    state->respond = respond;
    state->arg = arg;
    state->request = request;
    state->req_pkt = req_pkt;
    state->from = from;
    state->active_realm = kdc_active_realm;

    errcode = kdc_make_rstate(kdc_active_realm, &state->rstate);
    if (errcode != 0) {
        (*respond)(arg, errcode, NULL);
        return;
    }
    if (state->request->msg_type != KRB5_AS_REQ) {
        state->status = "msg_type mismatch";
        errcode = KRB5_BADMSGTYPE;
        goto errout;
    }
    if (fetch_asn1_field((unsigned char *) req_pkt->data,
                         1, 4, &encoded_req_body) != 0) {
        errcode = ASN1_BAD_ID;
        state->status = "Finding req_body";
        goto errout;
    }
    errcode = kdc_find_fast(&state->request, &encoded_req_body, NULL, NULL,
                            state->rstate, &state->inner_body);
    if (errcode) {
        state->status = "error decoding FAST";
        goto errout;
    }
    if (state->inner_body == NULL) {
        /* Not a FAST request; copy the encoded request body. */
        errcode = krb5_copy_data(kdc_context, &encoded_req_body,
                                 &state->inner_body);
        if (errcode) {
            state->status = "storing req body";
            goto errout;
        }
    }
    state->rock.request = state->request;
    state->rock.inner_body = state->inner_body;
    state->rock.rstate = state->rstate;
    state->rock.vctx = vctx;
    if (!state->request->client) {
        state->status = "NULL_CLIENT";
        errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
        goto errout;
    }
    if ((errcode = krb5_unparse_name(kdc_context,
                                     state->request->client,
                                     &state->cname))) {
        state->status = "UNPARSING_CLIENT";
        goto errout;
    }
    limit_string(state->cname);
    if (!state->request->server) {
        state->status = "NULL_SERVER";
        errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
        goto errout;
    }
    if ((errcode = krb5_unparse_name(kdc_context,
                                     state->request->server,
                                     &state->sname))) {
        state->status = "UNPARSING_SERVER";
        goto errout;
    }
    limit_string(state->sname);

    /*
     * We set KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY as a hint
     * to the backend to return naming information in lieu
     * of cross realm TGS entries.
     */
    setflag(state->c_flags, KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY);
    /*
     * Note that according to the referrals draft we should
     * always canonicalize enterprise principal names.
     */
    if (isflagset(state->request->kdc_options, KDC_OPT_CANONICALIZE) ||
        state->request->client->type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
        setflag(state->c_flags, KRB5_KDB_FLAG_CANONICALIZE);
        setflag(state->c_flags, KRB5_KDB_FLAG_ALIAS_OK);
    }
    if (include_pac_p(kdc_context, state->request)) {
        setflag(state->c_flags, KRB5_KDB_FLAG_INCLUDE_PAC);
    }
    errcode = krb5_db_get_principal(kdc_context, state->request->client,
                                    state->c_flags, &state->client);
    if (errcode == KRB5_KDB_CANTLOCK_DB)
        errcode = KRB5KDC_ERR_SVC_UNAVAILABLE;
    if (errcode == KRB5_KDB_NOENTRY) {
        state->status = "CLIENT_NOT_FOUND";
        if (vague_errors)
            errcode = KRB5KRB_ERR_GENERIC;
        else
            errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
        goto errout;
    } else if (errcode) {
        state->status = "LOOKING_UP_CLIENT";
        goto errout;
    }
    state->rock.client = state->client;

    /*
     * If the backend returned a principal that is not in the local
     * realm, then we need to refer the client to that realm.
     */
    if (!is_local_principal(kdc_active_realm, state->client->princ)) {
        /* Entry is a referral to another realm */
        state->status = "REFERRAL";
        errcode = KRB5KDC_ERR_WRONG_REALM;
        goto errout;
    }

    s_flags = 0;
    setflag(s_flags, KRB5_KDB_FLAG_ALIAS_OK);
    if (isflagset(state->request->kdc_options, KDC_OPT_CANONICALIZE)) {
        setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
    }
    errcode = krb5_db_get_principal(kdc_context, state->request->server,
                                    s_flags, &state->server);
    if (errcode == KRB5_KDB_CANTLOCK_DB)
        errcode = KRB5KDC_ERR_SVC_UNAVAILABLE;
    if (errcode == KRB5_KDB_NOENTRY) {
        state->status = "SERVER_NOT_FOUND";
        errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
        goto errout;
    } else if (errcode) {
        state->status = "LOOKING_UP_SERVER";
        goto errout;
    }

    if ((errcode = krb5_timeofday(kdc_context, &state->kdc_time))) {
        state->status = "TIMEOFDAY";
        goto errout;
    }
    state->authtime = state->kdc_time; /* for audit_as_request() */

    if ((errcode = validate_as_request(kdc_active_realm,
                                       state->request, *state->client,
                                       *state->server, state->kdc_time,
                                       &state->status, &state->e_data))) {
        if (!state->status)
            state->status = "UNKNOWN_REASON";
        errcode += ERROR_TABLE_BASE_krb5;
        goto errout;
    }

    /*
     * Select the keytype for the ticket session key.
     */
    if ((useenctype = select_session_keytype(kdc_active_realm, state->server,
                                             state->request->nktypes,
                                             state->request->ktype)) == 0) {
        /* unsupported ktype */
        state->status = "BAD_ENCRYPTION_TYPE";
        errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
        goto errout;
    }

    if ((errcode = krb5_c_make_random_key(kdc_context, useenctype,
                                          &state->session_key))) {
        state->status = "RANDOM_KEY_FAILED";
        goto errout;
    }

    /*
     * Canonicalization is only effective if we are issuing a TGT
     * (the intention is to allow support for Windows "short" realm
     * aliases, nothing more).
     */
    if (isflagset(s_flags, KRB5_KDB_FLAG_CANONICALIZE) &&
        krb5_is_tgs_principal(state->request->server) &&
        krb5_is_tgs_principal(state->server->princ)) {
        state->ticket_reply.server = state->server->princ;
    } else {
        state->ticket_reply.server = state->request->server;
    }

    state->enc_tkt_reply.flags = 0;
    state->enc_tkt_reply.times.authtime = state->authtime;

    setflag(state->enc_tkt_reply.flags, TKT_FLG_INITIAL);
    setflag(state->enc_tkt_reply.flags, TKT_FLG_ENC_PA_REP);

    /*
     * It should be noted that local policy may affect the
     * processing of any of these flags.  For example, some
     * realms may refuse to issue renewable tickets
     */

    if (isflagset(state->request->kdc_options, KDC_OPT_FORWARDABLE))
        setflag(state->enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);

    if (isflagset(state->request->kdc_options, KDC_OPT_PROXIABLE))
        setflag(state->enc_tkt_reply.flags, TKT_FLG_PROXIABLE);

    if (isflagset(state->request->kdc_options, KDC_OPT_ALLOW_POSTDATE))
        setflag(state->enc_tkt_reply.flags, TKT_FLG_MAY_POSTDATE);

    state->enc_tkt_reply.session = &state->session_key;
    if (isflagset(state->c_flags, KRB5_KDB_FLAG_CANONICALIZE)) {
        state->client_princ = *(state->client->princ);
    } else {
        state->client_princ = *(state->request->client);
        /* The realm is always canonicalized */
        state->client_princ.realm = state->client->princ->realm;
    }
    state->enc_tkt_reply.client = &state->client_princ;
    state->enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
    state->enc_tkt_reply.transited.tr_contents = empty_string;

    if (isflagset(state->request->kdc_options, KDC_OPT_POSTDATED)) {
        setflag(state->enc_tkt_reply.flags, TKT_FLG_POSTDATED);
        setflag(state->enc_tkt_reply.flags, TKT_FLG_INVALID);
        state->enc_tkt_reply.times.starttime = state->request->from;
    } else
        state->enc_tkt_reply.times.starttime = state->kdc_time;

    kdc_get_ticket_endtime(kdc_active_realm,
                           state->enc_tkt_reply.times.starttime,
                           kdc_infinity, state->request->till, state->client,
                           state->server, &state->enc_tkt_reply.times.endtime);

    if (isflagset(state->request->kdc_options, KDC_OPT_RENEWABLE_OK) &&
        !isflagset(state->client->attributes, KRB5_KDB_DISALLOW_RENEWABLE) &&
        (state->enc_tkt_reply.times.endtime < state->request->till)) {

        /* we set the RENEWABLE option for later processing */

        setflag(state->request->kdc_options, KDC_OPT_RENEWABLE);
        state->request->rtime = state->request->till;
    }
    rtime = (state->request->rtime == 0) ? kdc_infinity :
        state->request->rtime;

    if (isflagset(state->request->kdc_options, KDC_OPT_RENEWABLE)) {
        /*
         * XXX Should we squelch the output renew_till to be no
         * earlier than the endtime of the ticket?
         */
        setflag(state->enc_tkt_reply.flags, TKT_FLG_RENEWABLE);
        state->enc_tkt_reply.times.renew_till =
            min(rtime, state->enc_tkt_reply.times.starttime +
                min(state->client->max_renewable_life,
                    min(state->server->max_renewable_life,
                        max_renewable_life_for_realm)));
    } else
        state->enc_tkt_reply.times.renew_till = 0; /* XXX */

    /*
     * starttime is optional, and treated as authtime if not present.
     * so we can nuke it if it matches
     */
    if (state->enc_tkt_reply.times.starttime ==
        state->enc_tkt_reply.times.authtime)
        state->enc_tkt_reply.times.starttime = 0;

    state->enc_tkt_reply.caddrs = state->request->addresses;
    state->enc_tkt_reply.authorization_data = 0;

    /* If anonymous requests are being used, adjust the realm of the client
     * principal. */
    if (isflagset(state->request->kdc_options, KDC_OPT_REQUEST_ANONYMOUS)) {
        if (!krb5_principal_compare_any_realm(kdc_context,
                                              state->request->client,
                                              krb5_anonymous_principal())) {
            errcode = KRB5KDC_ERR_BADOPTION;
            state->status = "Anonymous requested but anonymous "
                "principal not used.";
            goto errout;
        }
        setflag(state->enc_tkt_reply.flags, TKT_FLG_ANONYMOUS);
        krb5_free_principal(kdc_context, state->request->client);
        state->request->client = NULL;
        errcode = krb5_copy_principal(kdc_context, krb5_anonymous_principal(),
                                      &state->request->client);
        if (errcode) {
            state->status = "Copying anonymous principal";
            goto errout;
        }
        state->enc_tkt_reply.client = state->request->client;
        setflag(state->client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH);
    }

    /*
     * Check the preauthentication if it is there.
     */
    if (state->request->padata) {
        check_padata(kdc_context, &state->rock, state->req_pkt,
                     state->request, &state->enc_tkt_reply, &state->pa_context,
                     &state->e_data, &state->typed_e_data, finish_preauth,
                     state);
    } else
        finish_preauth(state, 0);
    return;

errout:
    finish_process_as_req(state, errcode);
}
Exemplo n.º 7
0
static void
finish_process_as_req(struct as_req_state *state, krb5_error_code errcode)
{
    krb5_key_data *server_key;
    krb5_key_data *client_key;
    krb5_keyblock *as_encrypting_key = NULL;
    krb5_data *response = NULL;
    const char *emsg = 0;
    int did_log = 0;
    register int i;
    krb5_enctype useenctype;
    loop_respond_fn oldrespond;
    void *oldarg;
    kdc_realm_t *kdc_active_realm = state->active_realm;
    krb5_audit_state *au_state = state->au_state;

    assert(state);
    oldrespond = state->respond;
    oldarg = state->arg;

    if (errcode)
        goto egress;

    au_state->stage = ENCR_REP;

    if ((errcode = validate_forwardable(state->request, *state->client,
                                        *state->server, state->kdc_time,
                                        &state->status))) {
        errcode += ERROR_TABLE_BASE_krb5;
        goto egress;
    }

    state->ticket_reply.enc_part2 = &state->enc_tkt_reply;

    /*
     * Find the server key
     */
    if ((errcode = krb5_dbe_find_enctype(kdc_context, state->server,
                                         -1, /* ignore keytype   */
                                         -1, /* Ignore salttype  */
                                         0,  /* Get highest kvno */
                                         &server_key))) {
        state->status = "FINDING_SERVER_KEY";
        goto egress;
    }

    /*
     * Convert server->key into a real key
     * (it may be encrypted in the database)
     *
     *  server_keyblock is later used to generate auth data signatures
     */
    if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
                                             server_key,
                                             &state->server_keyblock,
                                             NULL))) {
        state->status = "DECRYPT_SERVER_KEY";
        goto egress;
    }

    /*
     * Find the appropriate client key.  We search in the order specified
     * by request keytype list.
     */
    client_key = NULL;
    useenctype = 0;
    for (i = 0; i < state->request->nktypes; i++) {
        useenctype = state->request->ktype[i];
        if (!krb5_c_valid_enctype(useenctype))
            continue;

        if (!krb5_dbe_find_enctype(kdc_context, state->client,
                                   useenctype, -1, 0, &client_key))
            break;
    }

    if (client_key != NULL) {
        /* Decrypt the client key data entry to get the real reply key. */
        errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL, client_key,
                                            &state->client_keyblock, NULL);
        if (errcode) {
            state->status = "DECRYPT_CLIENT_KEY";
            goto egress;
        }
        state->client_keyblock.enctype = useenctype;
        state->rock.client_key = client_key;
    }

    /* Start assembling the response */
    state->reply.msg_type = KRB5_AS_REP;
    state->reply.client = state->enc_tkt_reply.client; /* post canonization */
    state->reply.ticket = &state->ticket_reply;
    state->reply_encpart.session = &state->session_key;
    if ((errcode = fetch_last_req_info(state->client,
                                       &state->reply_encpart.last_req))) {
        state->status = "FETCH_LAST_REQ";
        goto egress;
    }
    state->reply_encpart.nonce = state->request->nonce;
    state->reply_encpart.key_exp = get_key_exp(state->client);
    state->reply_encpart.flags = state->enc_tkt_reply.flags;
    state->reply_encpart.server = state->ticket_reply.server;

    /* copy the time fields EXCEPT for authtime; it's location
     *  is used for ktime
     */
    state->reply_encpart.times = state->enc_tkt_reply.times;
    state->reply_encpart.times.authtime = state->authtime = state->kdc_time;

    state->reply_encpart.caddrs = state->enc_tkt_reply.caddrs;
    state->reply_encpart.enc_padata = NULL;

    /* Fetch the padata info to be returned (do this before
     *  authdata to handle possible replacement of reply key
     */
    errcode = return_padata(kdc_context, &state->rock, state->req_pkt,
                            state->request, &state->reply,
                            &state->client_keyblock, &state->pa_context);
    if (errcode) {
        state->status = "KDC_RETURN_PADATA";
        goto egress;
    }

    /* If we didn't find a client long-term key and no preauth mechanism
     * replaced the reply key, error out now. */
    if (state->client_keyblock.enctype == ENCTYPE_NULL) {
        state->status = "CANT_FIND_CLIENT_KEY";
        errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
        goto egress;
    }

    errcode = handle_authdata(kdc_context,
                              state->c_flags,
                              state->client,
                              state->server,
                              state->server,
                              &state->client_keyblock,
                              &state->server_keyblock,
                              &state->server_keyblock,
                              state->req_pkt,
                              state->request,
                              NULL, /* for_user_princ */
                              NULL, /* enc_tkt_request */
                              &state->enc_tkt_reply);
    if (errcode) {
        krb5_klog_syslog(LOG_INFO, _("AS_REQ : handle_authdata (%d)"),
                         errcode);
        state->status = "HANDLE_AUTHDATA";
        goto egress;
    }

    errcode = krb5_encrypt_tkt_part(kdc_context, &state->server_keyblock,
                                    &state->ticket_reply);
    if (errcode) {
        state->status = "ENCRYPTING_TICKET";
        goto egress;
    }

    errcode = kau_make_tkt_id(kdc_context, &state->ticket_reply,
                              &au_state->tkt_out_id);
    if (errcode) {
        state->status = "GENERATE_TICKET_ID";
        goto egress;
    }

    state->ticket_reply.enc_part.kvno = server_key->key_data_kvno;
    errcode = kdc_fast_response_handle_padata(state->rstate,
                                              state->request,
                                              &state->reply,
                                              state->client_keyblock.enctype);
    if (errcode) {
        state->status = "fast response handling";
        goto egress;
    }

    /* now encode/encrypt the response */

    state->reply.enc_part.enctype = state->client_keyblock.enctype;

    errcode = kdc_fast_handle_reply_key(state->rstate, &state->client_keyblock,
                                        &as_encrypting_key);
    if (errcode) {
        state->status = "generating reply key";
        goto egress;
    }
    errcode = return_enc_padata(kdc_context, state->req_pkt, state->request,
                                as_encrypting_key, state->server,
                                &state->reply_encpart, FALSE);
    if (errcode) {
        state->status = "KDC_RETURN_ENC_PADATA";
        goto egress;
    }

    if (kdc_fast_hide_client(state->rstate))
        state->reply.client = (krb5_principal)krb5_anonymous_principal();
    errcode = krb5_encode_kdc_rep(kdc_context, KRB5_AS_REP,
                                  &state->reply_encpart, 0,
                                  as_encrypting_key,
                                  &state->reply, &response);
    if (client_key != NULL)
        state->reply.enc_part.kvno = client_key->key_data_kvno;
    if (errcode) {
        state->status = "ENCODE_KDC_REP";
        goto egress;
    }

    /* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
       can use them in raw form if needed.  But, we don't... */
    memset(state->reply.enc_part.ciphertext.data, 0,
           state->reply.enc_part.ciphertext.length);
    free(state->reply.enc_part.ciphertext.data);

    log_as_req(kdc_context, state->from, state->request, &state->reply,
               state->client, state->cname, state->server,
               state->sname, state->authtime, 0, 0, 0);
    did_log = 1;

egress:
    if (errcode != 0)
        assert (state->status != 0);

    au_state->status = state->status;
    au_state->reply = &state->reply;
    kau_as_req(kdc_context,
              (errcode || state->preauth_err) ? FALSE : TRUE, au_state);
    kau_free_kdc_req(au_state);

    free_padata_context(kdc_context, state->pa_context);
    if (as_encrypting_key)
        krb5_free_keyblock(kdc_context, as_encrypting_key);
    if (errcode)
        emsg = krb5_get_error_message(kdc_context, errcode);

    if (state->status) {
        log_as_req(kdc_context,
                   state->from, state->request, &state->reply, state->client,
                   state->cname, state->server, state->sname, state->authtime,
                   state->status, errcode, emsg);
        did_log = 1;
    }
    if (errcode) {
        if (state->status == 0) {
            state->status = emsg;
        }
        if (errcode != KRB5KDC_ERR_DISCARD) {
            errcode -= ERROR_TABLE_BASE_krb5;
            if (errcode < 0 || errcode > KRB_ERR_MAX)
                errcode = KRB_ERR_GENERIC;

            errcode = prepare_error_as(state->rstate, state->request,
                                       errcode, state->e_data,
                                       state->typed_e_data,
                                       ((state->client != NULL) ?
                                        state->client->princ : NULL),
                                       &response, state->status);
            state->status = 0;
        }
    }

    if (emsg)
        krb5_free_error_message(kdc_context, emsg);
    if (state->enc_tkt_reply.authorization_data != NULL)
        krb5_free_authdata(kdc_context,
                           state->enc_tkt_reply.authorization_data);
    if (state->server_keyblock.contents != NULL)
        krb5_free_keyblock_contents(kdc_context, &state->server_keyblock);
    if (state->client_keyblock.contents != NULL)
        krb5_free_keyblock_contents(kdc_context, &state->client_keyblock);
    if (state->reply.padata != NULL)
        krb5_free_pa_data(kdc_context, state->reply.padata);
    if (state->reply_encpart.enc_padata)
        krb5_free_pa_data(kdc_context, state->reply_encpart.enc_padata);

    if (state->cname != NULL)
        free(state->cname);
    if (state->sname != NULL)
        free(state->sname);
    krb5_db_free_principal(kdc_context, state->client);
    krb5_db_free_principal(kdc_context, state->server);
    if (state->session_key.contents != NULL)
        krb5_free_keyblock_contents(kdc_context, &state->session_key);
    if (state->ticket_reply.enc_part.ciphertext.data != NULL) {
        memset(state->ticket_reply.enc_part.ciphertext.data , 0,
               state->ticket_reply.enc_part.ciphertext.length);
        free(state->ticket_reply.enc_part.ciphertext.data);
    }

    krb5_free_pa_data(kdc_context, state->e_data);
    krb5_free_data(kdc_context, state->inner_body);
    kdc_free_rstate(state->rstate);
    krb5_free_kdc_req(kdc_context, state->request);
    assert(did_log != 0);

    free(state);
    (*oldrespond)(oldarg, errcode, response);
}
Exemplo n.º 8
0
static krb5_error_code
prepare_error_as(struct kdc_request_state *rstate, krb5_kdc_req *request,
                 krb5_db_entry *local_tgt, int error, krb5_pa_data **e_data_in,
                 krb5_boolean typed_e_data, krb5_principal canon_client,
                 krb5_data **response, const char *status)
{
    krb5_error errpkt;
    krb5_error_code retval;
    krb5_data *scratch = NULL, *e_data_asn1 = NULL, *fast_edata = NULL;
    krb5_pa_data **e_data = NULL, *cookie = NULL;
    kdc_realm_t *kdc_active_realm = rstate->realm_data;
    size_t count;

    if (e_data_in != NULL) {
        /* Add a PA-FX-COOKIE to e_data_in.  e_data is a shallow copy
         * containing aliases. */
        for (count = 0; e_data_in[count] != NULL; count++);
        e_data = calloc(count + 2, sizeof(*e_data));
        if (e_data == NULL)
            return ENOMEM;
        memcpy(e_data, e_data_in, count * sizeof(*e_data));
        retval = kdc_fast_make_cookie(kdc_context, rstate, local_tgt,
                                      request->client, &cookie);
        e_data[count] = cookie;
    }

    errpkt.ctime = request->nonce;
    errpkt.cusec = 0;

    retval = krb5_us_timeofday(kdc_context, &errpkt.stime, &errpkt.susec);
    if (retval)
        goto cleanup;
    errpkt.error = error;
    errpkt.server = request->server;
    errpkt.client = (error == KDC_ERR_WRONG_REALM) ? canon_client :
                    request->client;
    errpkt.text = string2data((char *)status);

    if (e_data != NULL) {
        if (typed_e_data)
            retval = encode_krb5_typed_data(e_data, &e_data_asn1);
        else
            retval = encode_krb5_padata_sequence(e_data, &e_data_asn1);
        if (retval)
            goto cleanup;
        errpkt.e_data = *e_data_asn1;
    } else
        errpkt.e_data = empty_data();

    retval = kdc_fast_handle_error(kdc_context, rstate, request, e_data,
                                   &errpkt, &fast_edata);
    if (retval)
        goto cleanup;
    if (fast_edata != NULL)
        errpkt.e_data = *fast_edata;

    scratch = k5alloc(sizeof(*scratch), &retval);
    if (scratch == NULL)
        goto cleanup;
    if (kdc_fast_hide_client(rstate) && errpkt.client != NULL)
        errpkt.client = (krb5_principal)krb5_anonymous_principal();
    retval = krb5_mk_error(kdc_context, &errpkt, scratch);
    if (retval)
        goto cleanup;

    *response = scratch;
    scratch = NULL;

cleanup:
    krb5_free_data(kdc_context, fast_edata);
    krb5_free_data(kdc_context, e_data_asn1);
    free(scratch);
    free(e_data);
    if (cookie != NULL)
        free(cookie->contents);
    free(cookie);
    return retval;
}
Exemplo n.º 9
0
krb5_error_code
pkinit_identity_initialize(krb5_context context,
                           pkinit_plg_crypto_context plg_cryptoctx,
                           pkinit_req_crypto_context req_cryptoctx,
                           pkinit_identity_opts *idopts,
                           pkinit_identity_crypto_context id_cryptoctx,
                           int do_matching,
                           krb5_principal princ)
{
    krb5_error_code retval = EINVAL;
    int i;

    pkiDebug("%s: %p %p %p\n", __FUNCTION__, context, idopts, id_cryptoctx);
    if (!(princ && krb5_principal_compare_any_realm (context, princ, krb5_anonymous_principal()))) {
        if (idopts == NULL || id_cryptoctx == NULL)
            goto errout;

        /*
         * If identity was specified, use that.  (For the kdc, this
         * is specified as pkinit_identity in the kdc.conf.  For users,
         * this is specified on the command line via X509_user_identity.)
         * If a user did not specify identity on the command line,
         * then we will try alternatives which may have been specified
         * in the config file.
         */
        if (idopts->identity != NULL) {
            retval = process_option_identity(context, plg_cryptoctx,
                                             req_cryptoctx, idopts,
                                             id_cryptoctx, idopts->identity);
        } else if (idopts->identity_alt != NULL) {
            for (i = 0; retval != 0 && idopts->identity_alt[i] != NULL; i++) {
                retval = process_option_identity(context, plg_cryptoctx,
                                                 req_cryptoctx, idopts,
                                                 id_cryptoctx,
                                                 idopts->identity_alt[i]);
            }
        } else {
            pkiDebug("%s: no user identity options specified\n", __FUNCTION__);
            goto errout;
        }
        if (retval)
            goto errout;

        retval = crypto_load_certs(context, plg_cryptoctx, req_cryptoctx,
                                   idopts, id_cryptoctx, princ);
        if (retval)
            goto errout;

        if (do_matching) {
            retval = pkinit_cert_matching(context, plg_cryptoctx,
                                          req_cryptoctx, id_cryptoctx, princ);
            if (retval) {
                pkiDebug("%s: No matching certificate found\n", __FUNCTION__);
                crypto_free_cert_info(context, plg_cryptoctx, req_cryptoctx,
                                      id_cryptoctx);
                goto errout;
            }
        } else {
            /* Tell crypto code to use the "default" */
            retval = crypto_cert_select_default(context, plg_cryptoctx,
                                                req_cryptoctx, id_cryptoctx);
            if (retval) {
                pkiDebug("%s: Failed while selecting default certificate\n",
                         __FUNCTION__);
                crypto_free_cert_info(context, plg_cryptoctx, req_cryptoctx,
                                      id_cryptoctx);
                goto errout;
            }
        }

        retval = crypto_free_cert_info(context, plg_cryptoctx, req_cryptoctx,
                                       id_cryptoctx);
        if (retval)
            goto errout;
    } /* Not anonymous principal */

    for (i = 0; idopts->anchors != NULL && idopts->anchors[i] != NULL; i++) {
        retval = process_option_ca_crl(context, plg_cryptoctx, req_cryptoctx,
                                       idopts, id_cryptoctx,
                                       idopts->anchors[i], CATYPE_ANCHORS);
        if (retval)
            goto errout;
    }
    for (i = 0; idopts->intermediates != NULL
             && idopts->intermediates[i] != NULL; i++) {
        retval = process_option_ca_crl(context, plg_cryptoctx, req_cryptoctx,
                                       idopts, id_cryptoctx,
                                       idopts->intermediates[i],
                                       CATYPE_INTERMEDIATES);
        if (retval)
            goto errout;
    }
    for (i = 0; idopts->crls != NULL && idopts->crls[i] != NULL; i++) {
        retval = process_option_ca_crl(context, plg_cryptoctx, req_cryptoctx,
                                       idopts, id_cryptoctx, idopts->crls[i],
                                       CATYPE_CRLS);
        if (retval)
            goto errout;
    }
    if (idopts->ocsp != NULL) {
        retval = ENOTSUP;
        goto errout;
    }

errout:
    return retval;
}