288 lines
7.7 KiB
C
288 lines
7.7 KiB
C
/*
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* Copyright (c) 1997, 1998, 1999 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 <krb5_locl.h>
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RCSID("$Id: get_for_creds.c,v 1.21 1999/12/20 00:57:37 assar Exp $");
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static krb5_error_code
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add_addrs(krb5_context context,
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krb5_addresses *addr,
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struct addrinfo *ai)
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{
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krb5_error_code ret;
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unsigned n, i;
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void *tmp;
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struct addrinfo *a;
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n = 0;
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for (a = ai; a != NULL; a = a->ai_next)
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++n;
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i = addr->len;
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addr->len += n;
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tmp = realloc(addr->val, addr->len * sizeof(*addr->val));
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if (tmp == NULL) {
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ret = ENOMEM;
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goto fail;
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}
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addr->val = tmp;
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for (a = ai; a != NULL; a = a->ai_next) {
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ret = krb5_sockaddr2address (a->ai_addr, &addr->val[i++]);
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if (ret)
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goto fail;
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}
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return 0;
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fail:
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krb5_free_addresses (context, addr);
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return ret;
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}
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/*
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*
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*/
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krb5_error_code
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krb5_fwd_tgt_creds (krb5_context context,
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krb5_auth_context auth_context,
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const char *hostname,
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krb5_principal client,
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krb5_principal server,
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krb5_ccache ccache,
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int forwardable,
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krb5_data *out_data)
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{
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krb5_flags flags = 0;
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krb5_creds creds;
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krb5_error_code ret;
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flags |= KDC_OPT_FORWARDED;
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if (forwardable)
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flags |= KDC_OPT_FORWARDABLE;
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memset (&creds, 0, sizeof(creds));
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creds.client = client;
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creds.server = server;
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ret = krb5_get_forwarded_creds (context,
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auth_context,
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ccache,
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flags,
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hostname,
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&creds,
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out_data);
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return ret;
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}
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/*
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*
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*/
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krb5_error_code
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krb5_get_forwarded_creds (krb5_context context,
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krb5_auth_context auth_context,
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krb5_ccache ccache,
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krb5_flags flags,
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const char *hostname,
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krb5_creds *in_creds,
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krb5_data *out_data)
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{
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krb5_error_code ret;
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krb5_creds *out_creds;
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krb5_addresses addrs;
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KRB_CRED cred;
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KrbCredInfo *krb_cred_info;
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EncKrbCredPart enc_krb_cred_part;
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size_t len;
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u_char buf[1024];
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int32_t sec, usec;
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krb5_kdc_flags kdc_flags;
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krb5_crypto crypto;
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struct addrinfo *ai;
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addrs.len = 0;
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addrs.val = NULL;
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ret = getaddrinfo (hostname, NULL, NULL, &ai);
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if (ret)
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return ret;
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ret = add_addrs (context, &addrs, ai);
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freeaddrinfo (ai);
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if (ret)
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return ret;
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kdc_flags.i = flags;
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ret = krb5_get_kdc_cred (context,
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ccache,
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kdc_flags,
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&addrs,
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NULL,
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in_creds,
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&out_creds);
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krb5_free_addresses (context, &addrs);
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if (ret) {
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return ret;
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}
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memset (&cred, 0, sizeof(cred));
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cred.pvno = 5;
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cred.msg_type = krb_cred;
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ALLOC_SEQ(&cred.tickets, 1);
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if (cred.tickets.val == NULL) {
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ret = ENOMEM;
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goto out2;
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}
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ret = decode_Ticket(out_creds->ticket.data,
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out_creds->ticket.length,
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cred.tickets.val, &len);
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if (ret)
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goto out3;
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memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
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ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
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if (enc_krb_cred_part.ticket_info.val == NULL) {
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ret = ENOMEM;
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goto out4;
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}
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krb5_us_timeofday (context, &sec, &usec);
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ALLOC(enc_krb_cred_part.timestamp, 1);
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if (enc_krb_cred_part.timestamp == NULL) {
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ret = ENOMEM;
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goto out4;
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}
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*enc_krb_cred_part.timestamp = sec;
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ALLOC(enc_krb_cred_part.usec, 1);
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if (enc_krb_cred_part.usec == NULL) {
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ret = ENOMEM;
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goto out4;
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}
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*enc_krb_cred_part.usec = usec;
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ret = krb5_make_addrport (&enc_krb_cred_part.s_address,
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auth_context->local_address,
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auth_context->local_port);
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if (ret)
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goto out4;
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ALLOC(enc_krb_cred_part.r_address, 1);
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if (enc_krb_cred_part.r_address == NULL) {
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ret = ENOMEM;
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goto out4;
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}
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ret = krb5_copy_address (context, auth_context->remote_address,
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enc_krb_cred_part.r_address);
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if (ret)
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goto out4;
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/* fill ticket_info.val[0] */
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enc_krb_cred_part.ticket_info.len = 1;
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krb_cred_info = enc_krb_cred_part.ticket_info.val;
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copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
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ALLOC(krb_cred_info->prealm, 1);
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copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
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ALLOC(krb_cred_info->pname, 1);
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copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
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ALLOC(krb_cred_info->flags, 1);
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*krb_cred_info->flags = out_creds->flags.b;
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ALLOC(krb_cred_info->authtime, 1);
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*krb_cred_info->authtime = out_creds->times.authtime;
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ALLOC(krb_cred_info->starttime, 1);
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*krb_cred_info->starttime = out_creds->times.starttime;
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ALLOC(krb_cred_info->endtime, 1);
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*krb_cred_info->endtime = out_creds->times.endtime;
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ALLOC(krb_cred_info->renew_till, 1);
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*krb_cred_info->renew_till = out_creds->times.renew_till;
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ALLOC(krb_cred_info->srealm, 1);
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copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
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ALLOC(krb_cred_info->sname, 1);
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copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
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ALLOC(krb_cred_info->caddr, 1);
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copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
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krb5_free_creds (context, out_creds);
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/* encode EncKrbCredPart */
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ret = krb5_encode_EncKrbCredPart (context,
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buf + sizeof(buf) - 1, sizeof(buf),
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&enc_krb_cred_part, &len);
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free_EncKrbCredPart (&enc_krb_cred_part);
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if (ret) {
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free_KRB_CRED(&cred);
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return ret;
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}
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krb5_crypto_init(context, auth_context->local_subkey, 0, &crypto);
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ret = krb5_encrypt_EncryptedData (context,
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crypto,
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KRB5_KU_KRB_CRED,
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buf + sizeof(buf) - len,
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len,
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0,
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&cred.enc_part);
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krb5_crypto_destroy(context, crypto);
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if (ret) {
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free_KRB_CRED(&cred);
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return ret;
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}
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ret = encode_KRB_CRED (buf + sizeof(buf) - 1, sizeof(buf),
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&cred, &len);
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free_KRB_CRED (&cred);
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if (ret)
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return ret;
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out_data->length = len;
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out_data->data = malloc(len);
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if (out_data->data == NULL)
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return ENOMEM;
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memcpy (out_data->data, buf + sizeof(buf) - len, len);
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return 0;
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out4:
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free_EncKrbCredPart(&enc_krb_cred_part);
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out3:
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free_KRB_CRED(&cred);
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out2:
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krb5_free_creds (context, out_creds);
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return ret;
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}
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