diff options
Diffstat (limited to 'crypto/kerberosIV/lib/krb/get_ad_tkt.c')
| -rw-r--r-- | crypto/kerberosIV/lib/krb/get_ad_tkt.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/get_ad_tkt.c b/crypto/kerberosIV/lib/krb/get_ad_tkt.c new file mode 100644 index 0000000..9590760 --- /dev/null +++ b/crypto/kerberosIV/lib/krb/get_ad_tkt.c @@ -0,0 +1,190 @@ +/* + * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Kungliga Tekniska + * Högskolan and its contributors. + * + * 4. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "krb_locl.h" + +RCSID("$Id: get_ad_tkt.c,v 1.16 1997/05/30 17:43:34 bg Exp $"); + +/* + * get_ad_tkt obtains a new service ticket from Kerberos, using + * the ticket-granting ticket which must be in the ticket file. + * It is typically called by krb_mk_req() when the client side + * of an application is creating authentication information to be + * sent to the server side. + * + * get_ad_tkt takes four arguments: three pointers to strings which + * contain the name, instance, and realm of the service for which the + * ticket is to be obtained; and an integer indicating the desired + * lifetime of the ticket. + * + * It returns an error status if the ticket couldn't be obtained, + * or AD_OK if all went well. The ticket is stored in the ticket + * cache. + * + * The request sent to the Kerberos ticket-granting service looks + * like this: + * + * pkt->dat + * + * TEXT original contents of authenticator+ticket + * pkt->dat built in krb_mk_req call + * + * 4 bytes time_ws always 0 (?) + * char lifetime lifetime argument passed + * string service service name argument + * string sinstance service instance arg. + * + * See "prot.h" for the reply packet layout and definitions of the + * extraction macros like pkt_version(), pkt_msg_type(), etc. + */ + +int +get_ad_tkt(char *service, char *sinstance, char *realm, int lifetime) +{ + static KTEXT_ST pkt_st; + KTEXT pkt = & pkt_st; /* Packet to KDC */ + static KTEXT_ST rpkt_st; + KTEXT rpkt = &rpkt_st; /* Returned packet */ + + CREDENTIALS cr; + char lrealm[REALM_SZ]; + u_int32_t time_ws = 0; + int kerror; + unsigned char *p; + + /* + * First check if we have a "real" TGT for the corresponding + * realm, if we don't, use ordinary inter-realm authentication. + */ + + kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET, realm, realm, &cr); + if (kerror == KSUCCESS) + strncpy(lrealm, realm, REALM_SZ); + else + kerror = krb_get_tf_realm(TKT_FILE, lrealm); + + if (kerror != KSUCCESS) + return(kerror); + + /* + * Look for the session key (and other stuff we don't need) + * in the ticket file for krbtgt.realm@lrealm where "realm" + * is the service's realm (passed in "realm" argument) and + * lrealm is the realm of our initial ticket. If we don't + * have this, we will try to get it. + */ + + if ((kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET, + realm, lrealm, &cr)) != KSUCCESS) { + /* + * If realm == lrealm, we have no hope, so let's not even try. + */ + if ((strncmp(realm, lrealm, REALM_SZ)) == 0) + return(AD_NOTGT); + else{ + if ((kerror = + get_ad_tkt(KRB_TICKET_GRANTING_TICKET, + realm, lrealm, lifetime)) != KSUCCESS) + if (kerror == KDC_PR_UNKNOWN) + return(AD_INTR_RLM_NOTGT); + else + return(kerror); + if ((kerror = krb_get_cred(KRB_TICKET_GRANTING_TICKET, + realm, lrealm, &cr)) != KSUCCESS) + return(kerror); + } + } + + /* + * Make up a request packet to the "krbtgt.realm@lrealm". + * Start by calling krb_mk_req() which puts ticket+authenticator + * into "pkt". Then tack other stuff on the end. + */ + + kerror = krb_mk_req(pkt, + KRB_TICKET_GRANTING_TICKET, + realm,lrealm,0L); + + if (kerror) + return(AD_NOTGT); + + p = pkt->dat + pkt->length; + + p += krb_put_int(time_ws, p, 4); + p += krb_put_int(lifetime, p, 1); + p += krb_put_nir(service, sinstance, NULL, p); + + pkt->length = p - pkt->dat; + rpkt->length = 0; + + /* Send the request to the local ticket-granting server */ + if ((kerror = send_to_kdc(pkt, rpkt, realm))) return(kerror); + + /* check packet version of the returned packet */ + + { + KTEXT_ST cip; + CREDENTIALS cred; + struct timeval tv; + + kerror = kdc_reply_cipher(rpkt, &cip); + if(kerror != KSUCCESS) + return kerror; + + encrypt_ktext(&cip, &cr.session, DES_DECRYPT); + + kerror = kdc_reply_cred(&cip, &cred); + if(kerror != KSUCCESS) + return kerror; + + if (strcmp(cred.service, service) || strcmp(cred.instance, sinstance) || + strcmp(cred.realm, realm)) /* not what we asked for */ + return INTK_ERR; /* we need a better code here XXX */ + + gettimeofday(&tv, NULL); + if (abs((int)(tv.tv_sec - cred.issue_date)) > CLOCK_SKEW) { + return RD_AP_TIME; /* XXX should probably be better code */ + } + + + kerror = save_credentials(cred.service, cred.instance, cred.realm, + cred.session, cred.lifetime, cred.kvno, + &cred.ticket_st, tv.tv_sec); + return kerror; + } +} |
