66a2335696
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@24491 ec53bebd-3082-4978-b11e-865c3cabbd6b
954 lines
26 KiB
C
954 lines
26 KiB
C
/*
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* Copyright (c) 1997 - 2005 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. 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 "kdc_locl.h"
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#ifdef KRB4
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#include <krb5-v4compat.h>
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#include <rx.h>
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#define KA_AUTHENTICATION_SERVICE 731
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#define KA_TICKET_GRANTING_SERVICE 732
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#define KA_MAINTENANCE_SERVICE 733
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#define AUTHENTICATE_OLD 1
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#define CHANGEPASSWORD 2
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#define GETTICKET_OLD 3
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#define SETPASSWORD 4
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#define SETFIELDS 5
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#define CREATEUSER 6
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#define DELETEUSER 7
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#define GETENTRY 8
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#define LISTENTRY 9
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#define GETSTATS 10
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#define DEBUG 11
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#define GETPASSWORD 12
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#define GETRANDOMKEY 13
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#define AUTHENTICATE 21
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#define AUTHENTICATE_V2 22
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#define GETTICKET 23
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/* XXX - Where do we get these? */
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#define RXGEN_OPCODE (-455)
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#define KADATABASEINCONSISTENT (180480L)
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#define KAEXIST (180481L)
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#define KAIO (180482L)
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#define KACREATEFAIL (180483L)
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#define KANOENT (180484L)
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#define KAEMPTY (180485L)
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#define KABADNAME (180486L)
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#define KABADINDEX (180487L)
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#define KANOAUTH (180488L)
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#define KAANSWERTOOLONG (180489L)
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#define KABADREQUEST (180490L)
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#define KAOLDINTERFACE (180491L)
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#define KABADARGUMENT (180492L)
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#define KABADCMD (180493L)
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#define KANOKEYS (180494L)
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#define KAREADPW (180495L)
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#define KABADKEY (180496L)
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#define KAUBIKINIT (180497L)
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#define KAUBIKCALL (180498L)
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#define KABADPROTOCOL (180499L)
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#define KANOCELLS (180500L)
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#define KANOCELL (180501L)
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#define KATOOMANYUBIKS (180502L)
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#define KATOOMANYKEYS (180503L)
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#define KABADTICKET (180504L)
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#define KAUNKNOWNKEY (180505L)
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#define KAKEYCACHEINVALID (180506L)
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#define KABADSERVER (180507L)
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#define KABADUSER (180508L)
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#define KABADCPW (180509L)
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#define KABADCREATE (180510L)
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#define KANOTICKET (180511L)
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#define KAASSOCUSER (180512L)
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#define KANOTSPECIAL (180513L)
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#define KACLOCKSKEW (180514L)
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#define KANORECURSE (180515L)
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#define KARXFAIL (180516L)
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#define KANULLPASSWORD (180517L)
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#define KAINTERNALERROR (180518L)
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#define KAPWEXPIRED (180519L)
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#define KAREUSED (180520L)
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#define KATOOSOON (180521L)
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#define KALOCKED (180522L)
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static krb5_error_code
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decode_rx_header (krb5_storage *sp,
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struct rx_header *h)
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{
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krb5_error_code ret;
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ret = krb5_ret_uint32(sp, &h->epoch);
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if (ret) return ret;
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ret = krb5_ret_uint32(sp, &h->connid);
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if (ret) return ret;
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ret = krb5_ret_uint32(sp, &h->callid);
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if (ret) return ret;
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ret = krb5_ret_uint32(sp, &h->seqno);
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if (ret) return ret;
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ret = krb5_ret_uint32(sp, &h->serialno);
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if (ret) return ret;
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ret = krb5_ret_uint8(sp, &h->type);
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if (ret) return ret;
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ret = krb5_ret_uint8(sp, &h->flags);
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if (ret) return ret;
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ret = krb5_ret_uint8(sp, &h->status);
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if (ret) return ret;
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ret = krb5_ret_uint8(sp, &h->secindex);
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if (ret) return ret;
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ret = krb5_ret_uint16(sp, &h->reserved);
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if (ret) return ret;
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ret = krb5_ret_uint16(sp, &h->serviceid);
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if (ret) return ret;
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return 0;
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}
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static krb5_error_code
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encode_rx_header (struct rx_header *h,
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krb5_storage *sp)
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{
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krb5_error_code ret;
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ret = krb5_store_uint32(sp, h->epoch);
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if (ret) return ret;
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ret = krb5_store_uint32(sp, h->connid);
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if (ret) return ret;
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ret = krb5_store_uint32(sp, h->callid);
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if (ret) return ret;
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ret = krb5_store_uint32(sp, h->seqno);
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if (ret) return ret;
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ret = krb5_store_uint32(sp, h->serialno);
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if (ret) return ret;
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ret = krb5_store_uint8(sp, h->type);
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if (ret) return ret;
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ret = krb5_store_uint8(sp, h->flags);
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if (ret) return ret;
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ret = krb5_store_uint8(sp, h->status);
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if (ret) return ret;
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ret = krb5_store_uint8(sp, h->secindex);
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if (ret) return ret;
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ret = krb5_store_uint16(sp, h->reserved);
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if (ret) return ret;
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ret = krb5_store_uint16(sp, h->serviceid);
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if (ret) return ret;
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return 0;
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}
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static void
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init_reply_header (struct rx_header *hdr,
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struct rx_header *reply_hdr,
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u_char type,
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u_char flags)
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{
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reply_hdr->epoch = hdr->epoch;
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reply_hdr->connid = hdr->connid;
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reply_hdr->callid = hdr->callid;
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reply_hdr->seqno = 1;
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reply_hdr->serialno = 1;
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reply_hdr->type = type;
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reply_hdr->flags = flags;
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reply_hdr->status = 0;
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reply_hdr->secindex = 0;
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reply_hdr->reserved = 0;
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reply_hdr->serviceid = hdr->serviceid;
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}
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/*
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* Create an error `reply´ using for the packet `hdr' with the error
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* `error´ code.
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*/
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static void
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make_error_reply (struct rx_header *hdr,
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uint32_t error,
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krb5_data *reply)
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{
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struct rx_header reply_hdr;
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krb5_error_code ret;
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krb5_storage *sp;
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init_reply_header (hdr, &reply_hdr, HT_ABORT, HF_LAST);
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sp = krb5_storage_emem();
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if (sp == NULL)
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return;
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ret = encode_rx_header (&reply_hdr, sp);
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if (ret)
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return;
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krb5_store_int32(sp, error);
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krb5_storage_to_data (sp, reply);
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krb5_storage_free (sp);
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}
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static krb5_error_code
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krb5_ret_xdr_data(krb5_storage *sp,
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krb5_data *data)
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{
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int ret;
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int size;
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ret = krb5_ret_int32(sp, &size);
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if(ret)
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return ret;
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if(size < 0)
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return ERANGE;
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data->length = size;
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if (size) {
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u_char foo[4];
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size_t pad = (4 - size % 4) % 4;
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data->data = malloc(size);
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if (data->data == NULL)
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return ENOMEM;
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ret = krb5_storage_read(sp, data->data, size);
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if(ret != size)
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return (ret < 0)? errno : KRB5_CC_END;
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if (pad) {
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ret = krb5_storage_read(sp, foo, pad);
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if (ret != pad)
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return (ret < 0)? errno : KRB5_CC_END;
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}
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} else
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data->data = NULL;
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return 0;
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}
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static krb5_error_code
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krb5_store_xdr_data(krb5_storage *sp,
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krb5_data data)
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{
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u_char zero[4] = {0, 0, 0, 0};
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int ret;
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size_t pad;
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ret = krb5_store_int32(sp, data.length);
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if(ret < 0)
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return ret;
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ret = krb5_storage_write(sp, data.data, data.length);
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if(ret != data.length){
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if(ret < 0)
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return errno;
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return KRB5_CC_END;
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}
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pad = (4 - data.length % 4) % 4;
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if (pad) {
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ret = krb5_storage_write(sp, zero, pad);
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if (ret != pad) {
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if (ret < 0)
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return errno;
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return KRB5_CC_END;
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}
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}
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return 0;
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}
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static krb5_error_code
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create_reply_ticket (krb5_context context,
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struct rx_header *hdr,
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Key *skey,
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char *name, char *instance, char *realm,
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struct sockaddr_in *addr,
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int life,
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int kvno,
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int32_t max_seq_len,
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const char *sname, const char *sinstance,
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uint32_t challenge,
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const char *label,
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krb5_keyblock *key,
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krb5_data *reply)
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{
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krb5_error_code ret;
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krb5_data ticket;
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krb5_keyblock session;
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krb5_storage *sp;
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krb5_data enc_data;
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struct rx_header reply_hdr;
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char zero[8];
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size_t pad;
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unsigned fyrtiosjuelva;
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/* create the ticket */
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krb5_generate_random_keyblock(context, ETYPE_DES_PCBC_NONE, &session);
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_krb5_krb_create_ticket(context,
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0,
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name,
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instance,
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realm,
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addr->sin_addr.s_addr,
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&session,
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life,
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kdc_time,
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sname,
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sinstance,
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&skey->key,
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&ticket);
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/* create the encrypted part of the reply */
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sp = krb5_storage_emem ();
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krb5_generate_random_block(&fyrtiosjuelva, sizeof(fyrtiosjuelva));
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fyrtiosjuelva &= 0xffffffff;
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krb5_store_int32 (sp, fyrtiosjuelva);
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krb5_store_int32 (sp, challenge);
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krb5_storage_write (sp, session.keyvalue.data, 8);
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krb5_free_keyblock_contents(context, &session);
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krb5_store_int32 (sp, kdc_time);
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krb5_store_int32 (sp, kdc_time + _krb5_krb_life_to_time (0, life));
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krb5_store_int32 (sp, kvno);
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krb5_store_int32 (sp, ticket.length);
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krb5_store_stringz (sp, name);
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krb5_store_stringz (sp, instance);
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#if 1 /* XXX - Why shouldn't the realm go here? */
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krb5_store_stringz (sp, "");
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#else
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krb5_store_stringz (sp, realm);
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#endif
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krb5_store_stringz (sp, sname);
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krb5_store_stringz (sp, sinstance);
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krb5_storage_write (sp, ticket.data, ticket.length);
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krb5_storage_write (sp, label, strlen(label));
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/* pad to DES block */
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memset (zero, 0, sizeof(zero));
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pad = (8 - krb5_storage_seek (sp, 0, SEEK_CUR) % 8) % 8;
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krb5_storage_write (sp, zero, pad);
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krb5_storage_to_data (sp, &enc_data);
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krb5_storage_free (sp);
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if (enc_data.length > max_seq_len) {
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krb5_data_free (&enc_data);
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make_error_reply (hdr, KAANSWERTOOLONG, reply);
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return 0;
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}
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/* encrypt it */
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{
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DES_key_schedule schedule;
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DES_cblock deskey;
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memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
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DES_set_key_unchecked (&deskey, &schedule);
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DES_pcbc_encrypt (enc_data.data,
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enc_data.data,
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enc_data.length,
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&schedule,
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&deskey,
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DES_ENCRYPT);
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memset (&schedule, 0, sizeof(schedule));
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memset (&deskey, 0, sizeof(deskey));
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}
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/* create the reply packet */
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init_reply_header (hdr, &reply_hdr, HT_DATA, HF_LAST);
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sp = krb5_storage_emem ();
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ret = encode_rx_header (&reply_hdr, sp);
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krb5_store_int32 (sp, max_seq_len);
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krb5_store_xdr_data (sp, enc_data);
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krb5_data_free (&enc_data);
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krb5_storage_to_data (sp, reply);
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krb5_storage_free (sp);
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return 0;
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}
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static krb5_error_code
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unparse_auth_args (krb5_storage *sp,
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char **name,
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char **instance,
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time_t *start_time,
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time_t *end_time,
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krb5_data *request,
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int32_t *max_seq_len)
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{
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krb5_data data;
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int32_t tmp;
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krb5_ret_xdr_data (sp, &data);
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*name = malloc(data.length + 1);
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if (*name == NULL)
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return ENOMEM;
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memcpy (*name, data.data, data.length);
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(*name)[data.length] = '\0';
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krb5_data_free (&data);
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krb5_ret_xdr_data (sp, &data);
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*instance = malloc(data.length + 1);
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if (*instance == NULL) {
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free (*name);
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return ENOMEM;
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}
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memcpy (*instance, data.data, data.length);
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(*instance)[data.length] = '\0';
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krb5_data_free (&data);
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krb5_ret_int32 (sp, &tmp);
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*start_time = tmp;
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krb5_ret_int32 (sp, &tmp);
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*end_time = tmp;
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krb5_ret_xdr_data (sp, request);
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krb5_ret_int32 (sp, max_seq_len);
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/* ignore the rest */
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return 0;
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}
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static void
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do_authenticate (krb5_context context,
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krb5_kdc_configuration *config,
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struct rx_header *hdr,
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krb5_storage *sp,
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struct sockaddr_in *addr,
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const char *from,
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krb5_data *reply)
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{
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krb5_error_code ret;
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char *name = NULL;
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char *instance = NULL;
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time_t start_time;
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time_t end_time;
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krb5_data request;
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int32_t max_seq_len;
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hdb_entry_ex *client_entry = NULL;
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hdb_entry_ex *server_entry = NULL;
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Key *ckey = NULL;
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Key *skey = NULL;
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krb5_storage *reply_sp;
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time_t max_life;
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uint8_t life;
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int32_t chal;
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char client_name[256];
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char server_name[256];
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krb5_data_zero (&request);
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ret = unparse_auth_args (sp, &name, &instance, &start_time, &end_time,
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&request, &max_seq_len);
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if (ret != 0 || request.length < 8) {
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make_error_reply (hdr, KABADREQUEST, reply);
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goto out;
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}
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snprintf (client_name, sizeof(client_name), "%s.%s@%s",
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name, instance, config->v4_realm);
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snprintf (server_name, sizeof(server_name), "%s.%s@%s",
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"krbtgt", config->v4_realm, config->v4_realm);
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kdc_log(context, config, 0, "AS-REQ (kaserver) %s from %s for %s",
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client_name, from, server_name);
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ret = _kdc_db_fetch4 (context, config, name, instance,
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config->v4_realm, HDB_F_GET_CLIENT,
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&client_entry);
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if (ret) {
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kdc_log(context, config, 0, "Client not found in database: %s: %s",
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client_name, krb5_get_err_text(context, ret));
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make_error_reply (hdr, KANOENT, reply);
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goto out;
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}
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ret = _kdc_db_fetch4 (context, config, "krbtgt",
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||
config->v4_realm, config->v4_realm,
|
||
HDB_F_GET_KRBTGT, &server_entry);
|
||
if (ret) {
|
||
kdc_log(context, config, 0, "Server not found in database: %s: %s",
|
||
server_name, krb5_get_err_text(context, ret));
|
||
make_error_reply (hdr, KANOENT, reply);
|
||
goto out;
|
||
}
|
||
|
||
ret = _kdc_check_flags (context, config,
|
||
client_entry, client_name,
|
||
server_entry, server_name,
|
||
TRUE);
|
||
if (ret) {
|
||
make_error_reply (hdr, KAPWEXPIRED, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* find a DES key */
|
||
ret = _kdc_get_des_key(context, client_entry, FALSE, TRUE, &ckey);
|
||
if(ret){
|
||
kdc_log(context, config, 0, "no suitable DES key for client");
|
||
make_error_reply (hdr, KANOKEYS, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* find a DES key */
|
||
ret = _kdc_get_des_key(context, server_entry, TRUE, TRUE, &skey);
|
||
if(ret){
|
||
kdc_log(context, config, 0, "no suitable DES key for server");
|
||
make_error_reply (hdr, KANOKEYS, reply);
|
||
goto out;
|
||
}
|
||
|
||
{
|
||
DES_cblock key;
|
||
DES_key_schedule schedule;
|
||
|
||
/* try to decode the `request' */
|
||
memcpy (&key, ckey->key.keyvalue.data, sizeof(key));
|
||
DES_set_key_unchecked (&key, &schedule);
|
||
DES_pcbc_encrypt (request.data,
|
||
request.data,
|
||
request.length,
|
||
&schedule,
|
||
&key,
|
||
DES_DECRYPT);
|
||
memset (&schedule, 0, sizeof(schedule));
|
||
memset (&key, 0, sizeof(key));
|
||
}
|
||
|
||
/* check for the magic label */
|
||
if (memcmp ((char *)request.data + 4, "gTGS", 4) != 0) {
|
||
kdc_log(context, config, 0, "preauth failed for %s", client_name);
|
||
make_error_reply (hdr, KABADREQUEST, reply);
|
||
goto out;
|
||
}
|
||
|
||
reply_sp = krb5_storage_from_mem (request.data, 4);
|
||
krb5_ret_int32 (reply_sp, &chal);
|
||
krb5_storage_free (reply_sp);
|
||
|
||
if (abs(chal - kdc_time) > context->max_skew) {
|
||
make_error_reply (hdr, KACLOCKSKEW, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* life */
|
||
max_life = end_time - kdc_time;
|
||
/* end_time - kdc_time can sometimes be non-positive due to slight
|
||
time skew between client and server. Let's make sure it is postive */
|
||
if(max_life < 1)
|
||
max_life = 1;
|
||
if (client_entry->entry.max_life)
|
||
max_life = min(max_life, *client_entry->entry.max_life);
|
||
if (server_entry->entry.max_life)
|
||
max_life = min(max_life, *server_entry->entry.max_life);
|
||
|
||
life = krb_time_to_life(kdc_time, kdc_time + max_life);
|
||
|
||
create_reply_ticket (context,
|
||
hdr, skey,
|
||
name, instance, config->v4_realm,
|
||
addr, life, server_entry->entry.kvno,
|
||
max_seq_len,
|
||
"krbtgt", config->v4_realm,
|
||
chal + 1, "tgsT",
|
||
&ckey->key, reply);
|
||
|
||
out:
|
||
if (request.length) {
|
||
memset (request.data, 0, request.length);
|
||
krb5_data_free (&request);
|
||
}
|
||
if (name)
|
||
free (name);
|
||
if (instance)
|
||
free (instance);
|
||
if (client_entry)
|
||
_kdc_free_ent (context, client_entry);
|
||
if (server_entry)
|
||
_kdc_free_ent (context, server_entry);
|
||
}
|
||
|
||
static krb5_error_code
|
||
unparse_getticket_args (krb5_storage *sp,
|
||
int *kvno,
|
||
char **auth_domain,
|
||
krb5_data *ticket,
|
||
char **name,
|
||
char **instance,
|
||
krb5_data *times,
|
||
int32_t *max_seq_len)
|
||
{
|
||
krb5_data data;
|
||
int32_t tmp;
|
||
|
||
krb5_ret_int32 (sp, &tmp);
|
||
*kvno = tmp;
|
||
|
||
krb5_ret_xdr_data (sp, &data);
|
||
*auth_domain = malloc(data.length + 1);
|
||
if (*auth_domain == NULL)
|
||
return ENOMEM;
|
||
memcpy (*auth_domain, data.data, data.length);
|
||
(*auth_domain)[data.length] = '\0';
|
||
krb5_data_free (&data);
|
||
|
||
krb5_ret_xdr_data (sp, ticket);
|
||
|
||
krb5_ret_xdr_data (sp, &data);
|
||
*name = malloc(data.length + 1);
|
||
if (*name == NULL) {
|
||
free (*auth_domain);
|
||
return ENOMEM;
|
||
}
|
||
memcpy (*name, data.data, data.length);
|
||
(*name)[data.length] = '\0';
|
||
krb5_data_free (&data);
|
||
|
||
krb5_ret_xdr_data (sp, &data);
|
||
*instance = malloc(data.length + 1);
|
||
if (*instance == NULL) {
|
||
free (*auth_domain);
|
||
free (*name);
|
||
return ENOMEM;
|
||
}
|
||
memcpy (*instance, data.data, data.length);
|
||
(*instance)[data.length] = '\0';
|
||
krb5_data_free (&data);
|
||
|
||
krb5_ret_xdr_data (sp, times);
|
||
|
||
krb5_ret_int32 (sp, max_seq_len);
|
||
/* ignore the rest */
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
do_getticket (krb5_context context,
|
||
krb5_kdc_configuration *config,
|
||
struct rx_header *hdr,
|
||
krb5_storage *sp,
|
||
struct sockaddr_in *addr,
|
||
const char *from,
|
||
krb5_data *reply)
|
||
{
|
||
krb5_error_code ret;
|
||
int kvno;
|
||
char *auth_domain = NULL;
|
||
krb5_data aticket;
|
||
char *name = NULL;
|
||
char *instance = NULL;
|
||
krb5_data times;
|
||
int32_t max_seq_len;
|
||
hdb_entry_ex *server_entry = NULL;
|
||
hdb_entry_ex *client_entry = NULL;
|
||
hdb_entry_ex *krbtgt_entry = NULL;
|
||
Key *kkey = NULL;
|
||
Key *skey = NULL;
|
||
DES_cblock key;
|
||
DES_key_schedule schedule;
|
||
DES_cblock session;
|
||
time_t max_life;
|
||
int8_t life;
|
||
time_t start_time, end_time;
|
||
char server_name[256];
|
||
char client_name[256];
|
||
struct _krb5_krb_auth_data ad;
|
||
|
||
krb5_data_zero (&aticket);
|
||
krb5_data_zero (×);
|
||
|
||
memset(&ad, 0, sizeof(ad));
|
||
|
||
unparse_getticket_args (sp, &kvno, &auth_domain, &aticket,
|
||
&name, &instance, ×, &max_seq_len);
|
||
if (times.length < 8) {
|
||
make_error_reply (hdr, KABADREQUEST, reply);
|
||
goto out;
|
||
|
||
}
|
||
|
||
snprintf (server_name, sizeof(server_name),
|
||
"%s.%s@%s", name, instance, config->v4_realm);
|
||
|
||
ret = _kdc_db_fetch4 (context, config, name, instance,
|
||
config->v4_realm, HDB_F_GET_SERVER, &server_entry);
|
||
if (ret) {
|
||
kdc_log(context, config, 0, "Server not found in database: %s: %s",
|
||
server_name, krb5_get_err_text(context, ret));
|
||
make_error_reply (hdr, KANOENT, reply);
|
||
goto out;
|
||
}
|
||
|
||
ret = _kdc_db_fetch4 (context, config, "krbtgt",
|
||
config->v4_realm, config->v4_realm, HDB_F_GET_KRBTGT, &krbtgt_entry);
|
||
if (ret) {
|
||
kdc_log(context, config, 0,
|
||
"Server not found in database: %s.%s@%s: %s",
|
||
"krbtgt", config->v4_realm, config->v4_realm,
|
||
krb5_get_err_text(context, ret));
|
||
make_error_reply (hdr, KANOENT, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* find a DES key */
|
||
ret = _kdc_get_des_key(context, krbtgt_entry, TRUE, TRUE, &kkey);
|
||
if(ret){
|
||
kdc_log(context, config, 0, "no suitable DES key for krbtgt");
|
||
make_error_reply (hdr, KANOKEYS, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* find a DES key */
|
||
ret = _kdc_get_des_key(context, server_entry, TRUE, TRUE, &skey);
|
||
if(ret){
|
||
kdc_log(context, config, 0, "no suitable DES key for server");
|
||
make_error_reply (hdr, KANOKEYS, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* decrypt the incoming ticket */
|
||
memcpy (&key, kkey->key.keyvalue.data, sizeof(key));
|
||
|
||
/* unpack the ticket */
|
||
{
|
||
char *sname = NULL;
|
||
char *sinstance = NULL;
|
||
|
||
ret = _krb5_krb_decomp_ticket(context, &aticket, &kkey->key,
|
||
config->v4_realm, &sname,
|
||
&sinstance, &ad);
|
||
if (ret) {
|
||
kdc_log(context, config, 0,
|
||
"kaserver: decomp failed for %s.%s with %d",
|
||
sname, sinstance, ret);
|
||
make_error_reply (hdr, KABADTICKET, reply);
|
||
goto out;
|
||
}
|
||
|
||
if (strcmp (sname, "krbtgt") != 0
|
||
|| strcmp (sinstance, config->v4_realm) != 0) {
|
||
kdc_log(context, config, 0, "no TGT: %s.%s for %s.%s@%s",
|
||
sname, sinstance,
|
||
ad.pname, ad.pinst, ad.prealm);
|
||
make_error_reply (hdr, KABADTICKET, reply);
|
||
free(sname);
|
||
free(sinstance);
|
||
goto out;
|
||
}
|
||
free(sname);
|
||
free(sinstance);
|
||
|
||
if (kdc_time > _krb5_krb_life_to_time(ad.time_sec, ad.life)) {
|
||
kdc_log(context, config, 0, "TGT expired: %s.%s@%s",
|
||
ad.pname, ad.pinst, ad.prealm);
|
||
make_error_reply (hdr, KABADTICKET, reply);
|
||
goto out;
|
||
}
|
||
}
|
||
|
||
snprintf (client_name, sizeof(client_name),
|
||
"%s.%s@%s", ad.pname, ad.pinst, ad.prealm);
|
||
|
||
kdc_log(context, config, 0, "TGS-REQ (kaserver) %s from %s for %s",
|
||
client_name, from, server_name);
|
||
|
||
ret = _kdc_db_fetch4 (context, config,
|
||
ad.pname, ad.pinst, ad.prealm, HDB_F_GET_CLIENT,
|
||
&client_entry);
|
||
if(ret && ret != HDB_ERR_NOENTRY) {
|
||
kdc_log(context, config, 0,
|
||
"Client not found in database: (krb4) %s: %s",
|
||
client_name, krb5_get_err_text(context, ret));
|
||
make_error_reply (hdr, KANOENT, reply);
|
||
goto out;
|
||
}
|
||
if (client_entry == NULL && strcmp(ad.prealm, config->v4_realm) == 0) {
|
||
kdc_log(context, config, 0,
|
||
"Local client not found in database: (krb4) "
|
||
"%s", client_name);
|
||
make_error_reply (hdr, KANOENT, reply);
|
||
goto out;
|
||
}
|
||
|
||
ret = _kdc_check_flags (context, config,
|
||
client_entry, client_name,
|
||
server_entry, server_name,
|
||
FALSE);
|
||
if (ret) {
|
||
make_error_reply (hdr, KAPWEXPIRED, reply);
|
||
goto out;
|
||
}
|
||
|
||
/* decrypt the times */
|
||
memcpy(&session, ad.session.keyvalue.data, sizeof(session));
|
||
DES_set_key_unchecked (&session, &schedule);
|
||
DES_ecb_encrypt (times.data,
|
||
times.data,
|
||
&schedule,
|
||
DES_DECRYPT);
|
||
memset (&schedule, 0, sizeof(schedule));
|
||
memset (&session, 0, sizeof(session));
|
||
|
||
/* and extract them */
|
||
{
|
||
krb5_storage *tsp;
|
||
int32_t tmp;
|
||
|
||
tsp = krb5_storage_from_mem (times.data, times.length);
|
||
krb5_ret_int32 (tsp, &tmp);
|
||
start_time = tmp;
|
||
krb5_ret_int32 (tsp, &tmp);
|
||
end_time = tmp;
|
||
krb5_storage_free (tsp);
|
||
}
|
||
|
||
/* life */
|
||
max_life = end_time - kdc_time;
|
||
/* end_time - kdc_time can sometimes be non-positive due to slight
|
||
time skew between client and server. Let's make sure it is postive */
|
||
if(max_life < 1)
|
||
max_life = 1;
|
||
if (krbtgt_entry->entry.max_life)
|
||
max_life = min(max_life, *krbtgt_entry->entry.max_life);
|
||
if (server_entry->entry.max_life)
|
||
max_life = min(max_life, *server_entry->entry.max_life);
|
||
/* if this is a cross realm request, the client_entry will likely
|
||
be NULL */
|
||
if (client_entry && client_entry->entry.max_life)
|
||
max_life = min(max_life, *client_entry->entry.max_life);
|
||
|
||
life = _krb5_krb_time_to_life(kdc_time, kdc_time + max_life);
|
||
|
||
create_reply_ticket (context,
|
||
hdr, skey,
|
||
ad.pname, ad.pinst, ad.prealm,
|
||
addr, life, server_entry->entry.kvno,
|
||
max_seq_len,
|
||
name, instance,
|
||
0, "gtkt",
|
||
&ad.session, reply);
|
||
|
||
out:
|
||
_krb5_krb_free_auth_data(context, &ad);
|
||
if (aticket.length) {
|
||
memset (aticket.data, 0, aticket.length);
|
||
krb5_data_free (&aticket);
|
||
}
|
||
if (times.length) {
|
||
memset (times.data, 0, times.length);
|
||
krb5_data_free (×);
|
||
}
|
||
if (auth_domain)
|
||
free (auth_domain);
|
||
if (name)
|
||
free (name);
|
||
if (instance)
|
||
free (instance);
|
||
if (krbtgt_entry)
|
||
_kdc_free_ent (context, krbtgt_entry);
|
||
if (server_entry)
|
||
_kdc_free_ent (context, server_entry);
|
||
}
|
||
|
||
krb5_error_code
|
||
_kdc_do_kaserver(krb5_context context,
|
||
krb5_kdc_configuration *config,
|
||
unsigned char *buf,
|
||
size_t len,
|
||
krb5_data *reply,
|
||
const char *from,
|
||
struct sockaddr_in *addr)
|
||
{
|
||
krb5_error_code ret = 0;
|
||
struct rx_header hdr;
|
||
uint32_t op;
|
||
krb5_storage *sp;
|
||
|
||
if (len < RX_HEADER_SIZE)
|
||
return -1;
|
||
sp = krb5_storage_from_mem (buf, len);
|
||
|
||
ret = decode_rx_header (sp, &hdr);
|
||
if (ret)
|
||
goto out;
|
||
buf += RX_HEADER_SIZE;
|
||
len -= RX_HEADER_SIZE;
|
||
|
||
switch (hdr.type) {
|
||
case HT_DATA :
|
||
break;
|
||
case HT_ACK :
|
||
case HT_BUSY :
|
||
case HT_ABORT :
|
||
case HT_ACKALL :
|
||
case HT_CHAL :
|
||
case HT_RESP :
|
||
case HT_DEBUG :
|
||
default:
|
||
/* drop */
|
||
goto out;
|
||
}
|
||
|
||
|
||
if (hdr.serviceid != KA_AUTHENTICATION_SERVICE
|
||
&& hdr.serviceid != KA_TICKET_GRANTING_SERVICE) {
|
||
ret = -1;
|
||
goto out;
|
||
}
|
||
|
||
ret = krb5_ret_uint32(sp, &op);
|
||
if (ret)
|
||
goto out;
|
||
switch (op) {
|
||
case AUTHENTICATE :
|
||
case AUTHENTICATE_V2 :
|
||
do_authenticate (context, config, &hdr, sp, addr, from, reply);
|
||
break;
|
||
case GETTICKET :
|
||
do_getticket (context, config, &hdr, sp, addr, from, reply);
|
||
break;
|
||
case AUTHENTICATE_OLD :
|
||
case CHANGEPASSWORD :
|
||
case GETTICKET_OLD :
|
||
case SETPASSWORD :
|
||
case SETFIELDS :
|
||
case CREATEUSER :
|
||
case DELETEUSER :
|
||
case GETENTRY :
|
||
case LISTENTRY :
|
||
case GETSTATS :
|
||
case DEBUG :
|
||
case GETPASSWORD :
|
||
case GETRANDOMKEY :
|
||
default :
|
||
make_error_reply (&hdr, RXGEN_OPCODE, reply);
|
||
break;
|
||
}
|
||
|
||
out:
|
||
krb5_storage_free (sp);
|
||
return ret;
|
||
}
|
||
|
||
#endif /* KRB4 */
|