241 lines
7.3 KiB
C
241 lines
7.3 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb_locl.h"
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RCSID("$Id: krb_get_in_tkt.c,v 1.29 1999/06/29 21:18:07 bg Exp $");
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/*
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* decrypt_tkt(): Given user, instance, realm, passwd, key_proc
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* and the cipher text sent from the KDC, decrypt the cipher text
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* using the key returned by key_proc.
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*/
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static int
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decrypt_tkt(const char *user,
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char *instance,
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const char *realm,
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const void *arg,
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key_proc_t key_proc,
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KTEXT *cip)
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{
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des_cblock key; /* Key for decrypting cipher */
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int ret;
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ret = key_proc(user, instance, realm, arg, &key);
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if (ret != 0)
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return ret;
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encrypt_ktext(*cip, &key, DES_DECRYPT);
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memset(&key, 0, sizeof(key));
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return 0;
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}
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/*
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* krb_get_in_tkt() gets a ticket for a given principal to use a given
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* service and stores the returned ticket and session key for future
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* use.
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*
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* The "user", "instance", and "realm" arguments give the identity of
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* the client who will use the ticket. The "service" and "sinstance"
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* arguments give the identity of the server that the client wishes
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* to use. (The realm of the server is the same as the Kerberos server
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* to whom the request is sent.) The "life" argument indicates the
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* desired lifetime of the ticket; the "key_proc" argument is a pointer
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* to the routine used for getting the client's private key to decrypt
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* the reply from Kerberos. The "decrypt_proc" argument is a pointer
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* to the routine used to decrypt the reply from Kerberos; and "arg"
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* is an argument to be passed on to the "key_proc" routine.
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*
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* If all goes well, krb_get_in_tkt() returns INTK_OK, otherwise it
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* returns an error code: If an AUTH_MSG_ERR_REPLY packet is returned
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* by Kerberos, then the error code it contains is returned. Other
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* error codes returned by this routine include INTK_PROT to indicate
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* wrong protocol version, INTK_BADPW to indicate bad password (if
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* decrypted ticket didn't make sense), INTK_ERR if the ticket was for
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* the wrong server or the ticket store couldn't be initialized.
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*
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* The format of the message sent to Kerberos is as follows:
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*
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* Size Variable Field
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* ---- -------- -----
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*
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* 1 byte KRB_PROT_VERSION protocol version number
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* 1 byte AUTH_MSG_KDC_REQUEST | message type
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* HOST_BYTE_ORDER local byte order in lsb
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* string user client's name
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* string instance client's instance
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* string realm client's realm
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* 4 bytes tlocal.tv_sec timestamp in seconds
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* 1 byte life desired lifetime
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* string service service's name
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* string sinstance service's instance
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*/
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int
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krb_mk_as_req(const char *user,
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const char *instance,
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const char *realm,
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const char *service,
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const char *sinstance,
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int life,
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KTEXT cip)
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{
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KTEXT_ST pkt_st;
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KTEXT pkt = &pkt_st; /* Packet to KDC */
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KTEXT_ST rpkt_st;
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KTEXT rpkt = &rpkt_st; /* Reply from KDC */
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int kerror;
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struct timeval tv;
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/* BUILD REQUEST PACKET */
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unsigned char *p = pkt->dat;
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int tmp;
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size_t rem = sizeof(pkt->dat);
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tmp = krb_put_int(KRB_PROT_VERSION, p, rem, 1);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_int(AUTH_MSG_KDC_REQUEST, p, rem, 1);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_nir(user, instance, realm, p, rem);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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gettimeofday(&tv, NULL);
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tmp = krb_put_int(tv.tv_sec, p, rem, 4);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_int(life, p, rem, 1);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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tmp = krb_put_nir(service, sinstance, NULL, p, rem);
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if (tmp < 0)
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return KFAILURE;
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p += tmp;
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rem -= tmp;
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pkt->length = p - pkt->dat;
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rpkt->length = 0;
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/* SEND THE REQUEST AND RECEIVE THE RETURN PACKET */
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kerror = send_to_kdc(pkt, rpkt, realm);
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if(kerror) return kerror;
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kerror = kdc_reply_cipher(rpkt, cip);
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return kerror;
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}
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int
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krb_decode_as_rep(const char *user,
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char *instance,
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const char *realm,
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const char *service,
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const char *sinstance,
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key_proc_t key_proc,
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decrypt_proc_t decrypt_proc,
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const void *arg,
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KTEXT as_rep,
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CREDENTIALS *cred)
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{
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int kerror;
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time_t now;
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if (decrypt_proc == NULL)
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decrypt_tkt(user, instance, realm, arg, key_proc, &as_rep);
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else
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(*decrypt_proc)(user, instance, realm, arg, key_proc, &as_rep);
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kerror = kdc_reply_cred(as_rep, cred);
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if(kerror != KSUCCESS)
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return kerror;
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if (strcmp(cred->service, service) ||
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strcmp(cred->instance, sinstance) ||
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strcmp(cred->realm, realm)) /* not what we asked for */
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return INTK_ERR; /* we need a better code here XXX */
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now = time(NULL);
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if(krb_get_config_bool("kdc_timesync"))
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krb_set_kdc_time_diff(cred->issue_date - now);
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else if (abs((int)(now - cred->issue_date)) > CLOCK_SKEW)
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return RD_AP_TIME; /* XXX should probably be better code */
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return 0;
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}
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int
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krb_get_in_tkt(char *user, char *instance, char *realm,
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char *service, char *sinstance, int life,
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key_proc_t key_proc, decrypt_proc_t decrypt_proc, void *arg)
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{
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KTEXT_ST as_rep;
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CREDENTIALS cred;
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int ret;
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ret = krb_mk_as_req(user, instance, realm,
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service, sinstance, life, &as_rep);
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if(ret)
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return ret;
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ret = krb_decode_as_rep(user, instance, realm, service, sinstance,
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key_proc, decrypt_proc, arg, &as_rep, &cred);
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if(ret)
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return ret;
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return tf_setup(&cred, user, instance);
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}
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