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author | markm <markm@FreeBSD.org> | 1997-09-04 06:04:33 +0000 |
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committer | markm <markm@FreeBSD.org> | 1997-09-04 06:04:33 +0000 |
commit | a8a89cfaf983bc64f4b42f7c35209a5a36dd0fe8 (patch) | |
tree | 0b84977f19022a965f8c6145f067f951173f6290 /crypto/kerberosIV/lib/krb/mk_req.c | |
download | FreeBSD-src-a8a89cfaf983bc64f4b42f7c35209a5a36dd0fe8.zip FreeBSD-src-a8a89cfaf983bc64f4b42f7c35209a5a36dd0fe8.tar.gz |
Initial import of KTH eBones. This has been cleaned up to only include
the "core" Kerberos functionality. The rest of the userland will get their
own changes later.
Diffstat (limited to 'crypto/kerberosIV/lib/krb/mk_req.c')
-rw-r--r-- | crypto/kerberosIV/lib/krb/mk_req.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/mk_req.c b/crypto/kerberosIV/lib/krb/mk_req.c new file mode 100644 index 0000000..313ea04 --- /dev/null +++ b/crypto/kerberosIV/lib/krb/mk_req.c @@ -0,0 +1,215 @@ +/* + * 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: mk_req.c,v 1.17 1997/05/30 17:42:38 bg Exp $"); + +static int lifetime = 255; /* But no longer than TGT says. */ + + +static void +build_request(KTEXT req, char *name, char *inst, char *realm, + u_int32_t checksum) +{ + struct timeval tv; + unsigned char *p = req->dat; + + p += krb_put_nir(name, inst, realm, p); + + p += krb_put_int(checksum, p, 4); + + + /* Fill in the times on the request id */ + gettimeofday(&tv, NULL); + + *p++ = tv.tv_usec / 5000; /* 5ms */ + + p += krb_put_int(tv.tv_sec, p, 4); + + /* Fill to a multiple of 8 bytes for DES */ + req->length = ((p - req->dat + 7)/8) * 8; +} + + +/* + * krb_mk_req takes a text structure in which an authenticator is to + * be built, the name of a service, an instance, a realm, + * and a checksum. It then retrieves a ticket for + * the desired service and creates an authenticator in the text + * structure passed as the first argument. krb_mk_req returns + * KSUCCESS on success and a Kerberos error code on failure. + * + * The peer procedure on the other end is krb_rd_req. When making + * any changes to this routine it is important to make corresponding + * changes to krb_rd_req. + * + * The authenticator consists of the following: + * + * authent->dat + * + * unsigned char KRB_PROT_VERSION protocol version no. + * unsigned char AUTH_MSG_APPL_REQUEST message type + * (least significant + * bit of above) HOST_BYTE_ORDER local byte ordering + * unsigned char kvno from ticket server's key version + * string realm server's realm + * unsigned char tl ticket length + * unsigned char idl request id length + * text ticket->dat ticket for server + * text req_id->dat request id + * + * The ticket information is retrieved from the ticket cache or + * fetched from Kerberos. The request id (called the "authenticator" + * in the papers on Kerberos) contains the following: + * + * req_id->dat + * + * string cr.pname {name, instance, and + * string cr.pinst realm of principal + * string myrealm making this request} + * 4 bytes checksum checksum argument given + * unsigned char tv_local.tf_usec time (milliseconds) + * 4 bytes tv_local.tv_sec time (seconds) + * + * req_id->length = 3 strings + 3 terminating nulls + 5 bytes for time, + * all rounded up to multiple of 8. + */ + +int +krb_mk_req(KTEXT authent, char *service, char *instance, char *realm, + int32_t checksum) +{ + KTEXT_ST req_st; + KTEXT req_id = &req_st; + + CREDENTIALS cr; /* Credentials used by retr */ + KTEXT ticket = &(cr.ticket_st); /* Pointer to tkt_st */ + int retval; /* Returned by krb_get_cred */ + + char myrealm[REALM_SZ]; + + unsigned char *p = authent->dat; + + p += krb_put_int(KRB_PROT_VERSION, p, 1); + + p += krb_put_int(AUTH_MSG_APPL_REQUEST, p, 1); + + /* Get the ticket and move it into the authenticator */ + if (krb_ap_req_debug) + krb_warning("Realm: %s\n", realm); + + retval = krb_get_cred(service,instance,realm,&cr); + + if (retval == RET_NOTKT) { + retval = get_ad_tkt(service, instance, realm, lifetime); + if (retval == KSUCCESS) + retval = krb_get_cred(service, instance, realm, &cr); + } + + if (retval != KSUCCESS) + return retval; + + + /* + * With multi realm ticket files either find a matching TGT or + * else use the first TGT for inter-realm authentication. + * + * In myrealm hold the realm of the principal "owning" the + * corresponding ticket-granting-ticket. + */ + + retval = krb_get_cred(KRB_TICKET_GRANTING_TICKET, realm, realm, 0); + if (retval == KSUCCESS) + strncpy(myrealm, realm, REALM_SZ); + else + retval = krb_get_tf_realm(TKT_FILE, myrealm); + + if (retval != KSUCCESS) + return retval; + + if (krb_ap_req_debug) + krb_warning("serv=%s.%s@%s princ=%s.%s@%s\n", service, instance, realm, + cr.pname, cr.pinst, myrealm); + + p += krb_put_int(cr.kvno, p, 1); + + p += krb_put_string(realm, p); + + p += krb_put_int(ticket->length, p, 1); + + build_request(req_id, cr.pname, cr.pinst, myrealm, checksum); + + encrypt_ktext(req_id, &cr.session, DES_ENCRYPT); + + p += krb_put_int(req_id->length, p, 1); + + memcpy(p, ticket->dat, ticket->length); + + p += ticket->length; + + memcpy(p, req_id->dat, req_id->length); + + p += req_id->length; + + authent->length = p - authent->dat; + + memset(&cr, 0, sizeof(cr)); + memset(&req_st, 0, sizeof(req_st)); + + if (krb_ap_req_debug) + krb_warning("Authent->length = %d\n", authent->length); + + return KSUCCESS; +} + +/* + * krb_set_lifetime sets the default lifetime for additional tickets + * obtained via krb_mk_req(). + * + * It returns the previous value of the default lifetime. + */ + +int +krb_set_lifetime(int newval) +{ + int olife = lifetime; + + lifetime = newval; + return(olife); +} |