kerberos5.c

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     * encryption).  Then the best encryption type for the KDC and
     * last the best session key that shared between the client and
     * KDC runtime enctypes.
     */

    ret = _kdc_find_etype(context, client, b->etype.val, b->etype.len,
			  &ckey, &cetype);
    if (ret) {
	kdc_log(context, config, 0, 
		"Client (%s) has no support for etypes", client_name);
	goto out;
    }
	
    ret = _kdc_get_preferred_key(context, config,
				 server, server_name,
				 &setype, &skey);
    if(ret)
	goto out;

    /* 
     * Select a session enctype from the list of the crypto systems
     * supported enctype, is supported by the client and is one of the
     * enctype of the enctype of the krbtgt.
     *
     * The later is used as a hint what enctype all KDC are supporting
     * to make sure a newer version of KDC wont generate a session
     * enctype that and older version of a KDC in the same realm can't
     * decrypt.
     *
     * But if the KDC admin is paranoid and doesn't want to have "no
     * the best" enctypes on the krbtgt, lets save the best pick from
     * the client list and hope that that will work for any other
     * KDCs.
     */
    {
	const krb5_enctype *p;
	krb5_enctype clientbest = ETYPE_NULL;
	int i, j;

	p = krb5_kerberos_enctypes(context);

	sessionetype = ETYPE_NULL;

	for (i = 0; p[i] != ETYPE_NULL && sessionetype == ETYPE_NULL; i++) {
	    if (krb5_enctype_valid(context, p[i]) != 0)
		continue;

	    for (j = 0; j < b->etype.len && sessionetype == ETYPE_NULL; j++) {
		Key *dummy;
		/* check with client */
		if (p[i] != b->etype.val[j])
		    continue; 
		/* save best of union of { client, crypto system } */
		if (clientbest == ETYPE_NULL)
		    clientbest = p[i];
		/* check with krbtgt */
		ret = hdb_enctype2key(context, &server->entry, p[i], &dummy);
		if (ret) 
		    continue;
		sessionetype = p[i];
	    }
	}
	/* if krbtgt had no shared keys with client, pick clients best */
	if (clientbest != ETYPE_NULL && sessionetype == ETYPE_NULL) {
	    sessionetype = clientbest;
	} else if (sessionetype == ETYPE_NULL) {
	    kdc_log(context, config, 0,
		    "Client (%s) from %s has no common enctypes with KDC"
		    "to use for the session key", 
		    client_name, from); 
	    goto out;
	}
    }

    log_as_req(context, config, cetype, setype, b);

    if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey
       || (f.request_anonymous && !config->allow_anonymous)) {
	ret = KRB5KDC_ERR_BADOPTION;
	kdc_log(context, config, 0, "Bad KDC options -- %s", client_name);
	goto out;
    }
    
    rep.pvno = 5;
    rep.msg_type = krb_as_rep;
    copy_Realm(&client->entry.principal->realm, &rep.crealm);
    if (f.request_anonymous)
	_kdc_make_anonymous_principalname (&rep.cname);
    else
	_krb5_principal2principalname(&rep.cname, 
				      client->entry.principal);
    rep.ticket.tkt_vno = 5;
    copy_Realm(&server->entry.principal->realm, &rep.ticket.realm);
    _krb5_principal2principalname(&rep.ticket.sname, 
				  server->entry.principal);
    /* java 1.6 expects the name to be the same type, lets allow that
     * uncomplicated name-types. */
#define CNT(sp,t) (((sp)->sname->name_type) == KRB5_NT_##t)
    if (CNT(b, UNKNOWN) || CNT(b, PRINCIPAL) || CNT(b, SRV_INST) || CNT(b, SRV_HST) || CNT(b, SRV_XHST))
	rep.ticket.sname.name_type = b->sname->name_type;
#undef CNT

    et.flags.initial = 1;
    if(client->entry.flags.forwardable && server->entry.flags.forwardable)
	et.flags.forwardable = f.forwardable;
    else if (f.forwardable) {
	ret = KRB5KDC_ERR_POLICY;
	kdc_log(context, config, 0,
		"Ticket may not be forwardable -- %s", client_name);
	goto out;
    }
    if(client->entry.flags.proxiable && server->entry.flags.proxiable)
	et.flags.proxiable = f.proxiable;
    else if (f.proxiable) {
	ret = KRB5KDC_ERR_POLICY;
	kdc_log(context, config, 0, 
		"Ticket may not be proxiable -- %s", client_name);
	goto out;
    }
    if(client->entry.flags.postdate && server->entry.flags.postdate)
	et.flags.may_postdate = f.allow_postdate;
    else if (f.allow_postdate){
	ret = KRB5KDC_ERR_POLICY;
	kdc_log(context, config, 0,
		"Ticket may not be postdatable -- %s", client_name);
	goto out;
    }

    /* check for valid set of addresses */
    if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) {
	ret = KRB5KRB_AP_ERR_BADADDR;
	kdc_log(context, config, 0,
		"Bad address list requested -- %s", client_name);
	goto out;
    }

    ret = krb5_generate_random_keyblock(context, sessionetype, &et.key);
    if (ret)
	goto out;
    copy_PrincipalName(&rep.cname, &et.cname);
    copy_Realm(&rep.crealm, &et.crealm);
    
    {
	time_t start;
	time_t t;
	
	start = et.authtime = kdc_time;
    
	if(f.postdated && req->req_body.from){
	    ALLOC(et.starttime);
	    start = *et.starttime = *req->req_body.from;
	    et.flags.invalid = 1;
	    et.flags.postdated = 1; /* XXX ??? */
	}
	_kdc_fix_time(&b->till);
	t = *b->till;

	/* be careful not overflowing */

	if(client->entry.max_life)
	    t = start + min(t - start, *client->entry.max_life);
	if(server->entry.max_life)
	    t = start + min(t - start, *server->entry.max_life);
#if 0
	t = min(t, start + realm->max_life);
#endif
	et.endtime = t;
	if(f.renewable_ok && et.endtime < *b->till){
	    f.renewable = 1;
	    if(b->rtime == NULL){
		ALLOC(b->rtime);
		*b->rtime = 0;
	    }
	    if(*b->rtime < *b->till)
		*b->rtime = *b->till;
	}
	if(f.renewable && b->rtime){
	    t = *b->rtime;
	    if(t == 0)
		t = MAX_TIME;
	    if(client->entry.max_renew)
		t = start + min(t - start, *client->entry.max_renew);
	    if(server->entry.max_renew)
		t = start + min(t - start, *server->entry.max_renew);
#if 0
	    t = min(t, start + realm->max_renew);
#endif
	    ALLOC(et.renew_till);
	    *et.renew_till = t;
	    et.flags.renewable = 1;
	}
    }

    if (f.request_anonymous)
	et.flags.anonymous = 1;
    
    if(b->addresses){
	ALLOC(et.caddr);
	copy_HostAddresses(b->addresses, et.caddr);
    }
    
    et.transited.tr_type = DOMAIN_X500_COMPRESS;
    krb5_data_zero(&et.transited.contents); 
     
    copy_EncryptionKey(&et.key, &ek.key);

    /* The MIT ASN.1 library (obviously) doesn't tell lengths encoded
     * as 0 and as 0x80 (meaning indefinite length) apart, and is thus
     * incapable of correctly decoding SEQUENCE OF's of zero length.
     *
     * To fix this, always send at least one no-op last_req
     *
     * If there's a pw_end or valid_end we will use that,
     * otherwise just a dummy lr.
     */
    ek.last_req.val = malloc(2 * sizeof(*ek.last_req.val));
    if (ek.last_req.val == NULL) {
	ret = ENOMEM;
	goto out;
    }
    ek.last_req.len = 0;
    if (client->entry.pw_end
	&& (config->kdc_warn_pwexpire == 0
	    || kdc_time + config->kdc_warn_pwexpire >= *client->entry.pw_end)) {
	ek.last_req.val[ek.last_req.len].lr_type  = LR_PW_EXPTIME;
	ek.last_req.val[ek.last_req.len].lr_value = *client->entry.pw_end;
	++ek.last_req.len;
    }
    if (client->entry.valid_end) {
	ek.last_req.val[ek.last_req.len].lr_type  = LR_ACCT_EXPTIME;
	ek.last_req.val[ek.last_req.len].lr_value = *client->entry.valid_end;
	++ek.last_req.len;
    }
    if (ek.last_req.len == 0) {
	ek.last_req.val[ek.last_req.len].lr_type  = LR_NONE;
	ek.last_req.val[ek.last_req.len].lr_value = 0;
	++ek.last_req.len;
    }
    ek.nonce = b->nonce;
    if (client->entry.valid_end || client->entry.pw_end) {
	ALLOC(ek.key_expiration);
	if (client->entry.valid_end) {
	    if (client->entry.pw_end)
		*ek.key_expiration = min(*client->entry.valid_end, 
					 *client->entry.pw_end);
	    else
		*ek.key_expiration = *client->entry.valid_end;
	} else
	    *ek.key_expiration = *client->entry.pw_end;
    } else
	ek.key_expiration = NULL;
    ek.flags = et.flags;
    ek.authtime = et.authtime;
    if (et.starttime) {
	ALLOC(ek.starttime);
	*ek.starttime = *et.starttime;
    }
    ek.endtime = et.endtime;
    if (et.renew_till) {
	ALLOC(ek.renew_till);
	*ek.renew_till = *et.renew_till;
    }
    copy_Realm(&rep.ticket.realm, &ek.srealm);
    copy_PrincipalName(&rep.ticket.sname, &ek.sname);
    if(et.caddr){
	ALLOC(ek.caddr);
	copy_HostAddresses(et.caddr, ek.caddr);
    }

    ALLOC(rep.padata);
    rep.padata->len = 0;
    rep.padata->val = NULL;

    reply_key = &ckey->key;
#if PKINIT
    if (pkp) {
	ret = _kdc_pk_mk_pa_reply(context, config, pkp, client, 
				  req, req_buffer, 
				  &reply_key, rep.padata);
	if (ret)
	    goto out;
	ret = _kdc_add_inital_verified_cas(context,
					   config,
					   pkp,
					   &et);
	if (ret)
	    goto out;
    }
#endif

    set_salt_padata (rep.padata, ckey->salt);

    /* Add signing of alias referral */
    if (f.canonicalize) {
	PA_ClientCanonicalized canon;
	krb5_data data;
	PA_DATA pa;
	krb5_crypto crypto;
	size_t len;

	memset(&canon, 0, sizeof(canon));

	canon.names.requested_name = *b->cname;
	canon.names.real_name = client->entry.principal->name;

	ASN1_MALLOC_ENCODE(PA_ClientCanonicalizedNames, data.data, data.length,
			   &canon.names, &len, ret);
	if (ret) 
	    goto out;
	if (data.length != len)
	    krb5_abortx(context, "internal asn.1 error");

	/* sign using "returned session key" */
	ret = krb5_crypto_init(context, &et.key, 0, &crypto);
	if (ret) {
	    free(data.data);
	    goto out;
	}

	ret = krb5_create_checksum(context, crypto, 
				   KRB5_KU_CANONICALIZED_NAMES, 0,
				   data.data, data.length,
				   &canon.canon_checksum);
	free(data.data);
	krb5_crypto_destroy(context, crypto);
	if (ret)
	    goto out;
	  
	ASN1_MALLOC_ENCODE(PA_ClientCanonicalized, data.data, data.length,
			   &canon, &len, ret);
	free_Checksum(&canon.canon_checksum);
	if (ret) 
	    goto out;
	if (data.length != len)
	    krb5_abortx(context, "internal asn.1 error");

	pa.padata_type = KRB5_PADATA_CLIENT_CANONICALIZED;
	pa.padata_value = data;
	ret = add_METHOD_DATA(rep.padata, &pa);
	free(data.data);
	if (ret)
	    goto out;
    }

    if (rep.padata->len == 0) {
	free(rep.padata);
	rep.padata = NULL;
    }

    /* Add the PAC */
    if (send_pac_p(context, req)) {
	krb5_pac p = NULL;
	krb5_data data;

	ret = _kdc_pac_generate(context, client, &p);
	if (ret) {
	    kdc_log(context, config, 0, "PAC generation failed for -- %s", 
		    client_name);
	    goto out;
	}
	if (p != NULL) {
	    ret = _krb5_pac_sign(context, p, et.authtime,
				 client->entry.principal,
				 &skey->key, /* Server key */ 
				 &skey->key, /* FIXME: should be krbtgt key */
				 &data);
	    krb5_pac_free(context, p);
	    if (ret) {
		kdc_log(context, config, 0, "PAC signing failed for -- %s", 
			client_name);
		goto out;
	    }

	    ret = _kdc_tkt_add_if_relevant_ad(context, &et,
					      KRB5_AUTHDATA_WIN2K_PAC,
					      &data);
	    krb5_data_free(&data);
	    if (ret)
		goto out;
	}
    }

    _kdc_log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime, 
		       et.endtime, et.renew_till);

    /* do this as the last thing since this signs the EncTicketPart */
    ret = _kdc_add_KRB5SignedPath(context,
				  config,
				  server,
				  setype,
				  NULL,
				  NULL,
				  &et);
    if (ret)
	goto out;

    ret = _kdc_encode_reply(context, config, 
			    &rep, &et, &ek, setype, server->entry.kvno, 
			    &skey->key, client->entry.kvno, 
			    reply_key, &e_text, reply);
    free_EncTicketPart(&et);
    free_EncKDCRepPart(&ek);
    if (ret)
	goto out;

    /* */
    if (datagram_reply && reply->length > config->max_datagram_reply_length) {
	krb5_data_free(reply);
	ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
	e_text = "Reply packet too large";
    }

out:
    free_AS_REP(&rep);
    if(ret){
	krb5_mk_error(context,
		      ret,
		      e_text,
		      (e_data.data ? &e_data : NULL),
		      client_princ,
		      server_princ,
		      NULL,
		      NULL,
		      reply);
	ret = 0;
    }
#ifdef PKINIT
    if (pkp)
	_kdc_pk_free_client_param(context, pkp);
#endif
    if (e_data.data)
        free(e_data.data);
    if (client_princ)
	krb5_free_principal(context, client_princ);
    free(client_name);
    if (server_princ)
	krb5_free_principal(context, server_princ);
    free(server_name);
    if(client)
	_kdc_free_ent(context, client);
    if(server)
	_kdc_free_ent(context, server);
    return ret;
}

/*
 * Add the AuthorizationData `data