493 lines
13 KiB
C
493 lines
13 KiB
C
/* modified by Martin Hedenfalk <mhe@stacken.kth.se> for use in Curl
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* last modified 2000-09-18
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*/
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/*
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* Copyright (c) 1995, 1996, 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 "setup.h"
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#ifdef KRB4
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#include "security.h"
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#include "base64.h"
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#include <stdlib.h>
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#include <netdb.h>
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#include <syslog.h>
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#include <string.h>
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#include <krb.h>
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#ifdef FTP_SERVER
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#define LOCAL_ADDR ctrl_addr
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#define REMOTE_ADDR his_addr
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#else
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/*#define LOCAL_ADDR myctladdr***/
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/*#define REMOTE_ADDR hisctladdr***/
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#endif
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/*extern struct sockaddr *LOCAL_ADDR, *REMOTE_ADDR;***/
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#define LOCAL_ADDR (&local_addr)
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#define REMOTE_ADDR (&conn->serv_addr)
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#define myctladdr LOCAL_ADDR
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#define hisctladdr REMOTE_ADDR
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static struct sockaddr_in local_addr;
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struct krb4_data {
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des_cblock key;
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des_key_schedule schedule;
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char name[ANAME_SZ];
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char instance[INST_SZ];
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char realm[REALM_SZ];
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};
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#ifndef HAVE_STRLCPY
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size_t
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strlcpy (char *dst, const char *src, size_t dst_sz)
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{
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size_t n;
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char *p;
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for (p = dst, n = 0;
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n + 1 < dst_sz && *src != '\0';
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++p, ++src, ++n)
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*p = *src;
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*p = '\0';
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if (*src == '\0')
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return n;
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else
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return n + strlen (src);
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}
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#endif
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static int
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krb4_check_prot(void *app_data, int level)
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{
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if(level == prot_confidential)
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return -1;
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return 0;
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}
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static int
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krb4_decode(void *app_data, void *buf, int len, int level,
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struct connectdata *conn)
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{
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MSG_DAT m;
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int e;
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struct krb4_data *d = app_data;
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if(level == prot_safe)
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e = krb_rd_safe(buf, len, &d->key,
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(struct sockaddr_in *)REMOTE_ADDR,
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(struct sockaddr_in *)LOCAL_ADDR, &m);
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else
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e = krb_rd_priv(buf, len, d->schedule, &d->key,
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(struct sockaddr_in *)REMOTE_ADDR,
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(struct sockaddr_in *)LOCAL_ADDR, &m);
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if(e){
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syslog(LOG_ERR, "krb4_decode: %s", krb_get_err_text(e));
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return -1;
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}
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memmove(buf, m.app_data, m.app_length);
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return m.app_length;
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}
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static int
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krb4_overhead(void *app_data, int level, int len)
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{
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return 31;
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}
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static int
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krb4_encode(void *app_data, void *from, int length, int level, void **to,
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struct connectdata *conn)
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{
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struct krb4_data *d = app_data;
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*to = malloc(length + 31);
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if(level == prot_safe)
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return krb_mk_safe(from, *to, length, &d->key,
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(struct sockaddr_in *)LOCAL_ADDR,
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(struct sockaddr_in *)REMOTE_ADDR);
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else if(level == prot_private)
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return krb_mk_priv(from, *to, length, d->schedule, &d->key,
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(struct sockaddr_in *)LOCAL_ADDR,
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(struct sockaddr_in *)REMOTE_ADDR);
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else
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return -1;
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}
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#ifdef FTP_SERVER
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static int
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krb4_adat(void *app_data, void *buf, size_t len)
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{
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KTEXT_ST tkt;
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AUTH_DAT auth_dat;
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char *p;
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int kerror;
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u_int32_t cs;
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char msg[35]; /* size of encrypted block */
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int tmp_len;
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struct krb4_data *d = app_data;
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char inst[INST_SZ];
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struct sockaddr_in *his_addr_sin = (struct sockaddr_in *)his_addr;
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memcpy(tkt.dat, buf, len);
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tkt.length = len;
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k_getsockinst(0, inst, sizeof(inst));
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kerror = krb_rd_req(&tkt, "ftp", inst,
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his_addr_sin->sin_addr.s_addr, &auth_dat, "");
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if(kerror == RD_AP_UNDEC){
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k_getsockinst(0, inst, sizeof(inst));
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kerror = krb_rd_req(&tkt, "rcmd", inst,
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his_addr_sin->sin_addr.s_addr, &auth_dat, "");
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}
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if(kerror){
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reply(535, "Error reading request: %s.", krb_get_err_text(kerror));
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return -1;
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}
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memcpy(d->key, auth_dat.session, sizeof(d->key));
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des_set_key(&d->key, d->schedule);
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strlcpy(d->name, auth_dat.pname, sizeof(d->name));
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strlcpy(d->instance, auth_dat.pinst, sizeof(d->instance));
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strlcpy(d->realm, auth_dat.prealm, sizeof(d->instance));
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cs = auth_dat.checksum + 1;
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{
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unsigned char tmp[4];
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KRB_PUT_INT(cs, tmp, 4, sizeof(tmp));
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tmp_len = krb_mk_safe(tmp, msg, 4, &d->key,
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(struct sockaddr_in *)LOCAL_ADDR,
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(struct sockaddr_in *)REMOTE_ADDR);
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}
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if(tmp_len < 0){
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reply(535, "Error creating reply: %s.", strerror(errno));
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return -1;
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}
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len = tmp_len;
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if(base64_encode(msg, len, &p) < 0) {
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reply(535, "Out of memory base64-encoding.");
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return -1;
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}
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reply(235, "ADAT=%s", p);
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sec_complete = 1;
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free(p);
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return 0;
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}
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static int
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krb4_userok(void *app_data, char *user)
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{
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struct krb4_data *d = app_data;
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return krb_kuserok(d->name, d->instance, d->realm, user);
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}
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struct sec_server_mech krb4_server_mech = {
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"KERBEROS_V4",
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sizeof(struct krb4_data),
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NULL, /* init */
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NULL, /* end */
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krb4_check_prot,
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krb4_overhead,
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krb4_encode,
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krb4_decode,
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/* */
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NULL,
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krb4_adat,
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NULL, /* pbsz */
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NULL, /* ccc */
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krb4_userok
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};
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#else /* FTP_SERVER */
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static int
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mk_auth(struct krb4_data *d, KTEXT adat,
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char *service, char *host, int checksum)
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{
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int ret;
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CREDENTIALS cred;
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char sname[SNAME_SZ], inst[INST_SZ], realm[REALM_SZ];
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strlcpy(sname, service, sizeof(sname));
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strlcpy(inst, krb_get_phost(host), sizeof(inst));
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strlcpy(realm, krb_realmofhost(host), sizeof(realm));
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ret = krb_mk_req(adat, sname, inst, realm, checksum);
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if(ret)
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return ret;
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strlcpy(sname, service, sizeof(sname));
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strlcpy(inst, krb_get_phost(host), sizeof(inst));
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strlcpy(realm, krb_realmofhost(host), sizeof(realm));
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ret = krb_get_cred(sname, inst, realm, &cred);
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memmove(&d->key, &cred.session, sizeof(des_cblock));
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des_key_sched(&d->key, d->schedule);
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memset(&cred, 0, sizeof(cred));
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return ret;
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}
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static int
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krb4_auth(void *app_data, struct connectdata *conn)
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{
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int ret;
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char *p;
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int len;
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KTEXT_ST adat;
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MSG_DAT msg_data;
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int checksum;
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u_int32_t cs;
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struct krb4_data *d = app_data;
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struct sockaddr_in *localaddr = (struct sockaddr_in *)LOCAL_ADDR;
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struct sockaddr_in *remoteaddr = (struct sockaddr_in *)REMOTE_ADDR;
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char *host = conn->hp->h_name;
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size_t nread;
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int l = sizeof(local_addr);
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if(getsockname(conn->data->firstsocket, LOCAL_ADDR, &l) < 0)
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perror("getsockname()");
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checksum = getpid();
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ret = mk_auth(d, &adat, "ftp", host, checksum);
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if(ret == KDC_PR_UNKNOWN)
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ret = mk_auth(d, &adat, "rcmd", host, checksum);
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if(ret){
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printf("%s\n", krb_get_err_text(ret));
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return AUTH_CONTINUE;
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}
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#ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
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if (krb_get_config_bool("nat_in_use")) {
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struct in_addr natAddr;
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if (krb_get_our_ip_for_realm(krb_realmofhost(host),
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&natAddr) != KSUCCESS
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&& krb_get_our_ip_for_realm(NULL, &natAddr) != KSUCCESS)
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printf("Can't get address for realm %s\n",
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krb_realmofhost(host));
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else {
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if (natAddr.s_addr != localaddr->sin_addr.s_addr) {
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printf("Using NAT IP address (%s) for kerberos 4\n",
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inet_ntoa(natAddr));
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localaddr->sin_addr = natAddr;
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/*
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* This not the best place to do this, but it
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* is here we know that (probably) NAT is in
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* use!
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*/
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/*passivemode = 1;***/
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/*printf("Setting: Passive mode on.\n");***/
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}
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}
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}
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#endif
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/*printf("Local address is %s\n", inet_ntoa(localaddr->sin_addr));***/
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/*printf("Remote address is %s\n", inet_ntoa(remoteaddr->sin_addr));***/
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if(base64_encode(adat.dat, adat.length, &p) < 0) {
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printf("Out of memory base64-encoding.\n");
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return AUTH_CONTINUE;
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}
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/*ret = command("ADAT %s", p)*/
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ftpsendf(conn->data->firstsocket, conn, "ADAT %s", p);
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/* wait for feedback */
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nread = GetLastResponse(conn->data->firstsocket,
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conn->data->buffer, conn);
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if(nread < 0)
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return /*CURLE_OPERATION_TIMEOUTED*/-1;
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free(p);
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if(/*ret != COMPLETE*/conn->data->buffer[0] != '2'){
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printf("Server didn't accept auth data.\n");
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return AUTH_ERROR;
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}
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p = strstr(/*reply_string*/conn->data->buffer, "ADAT=");
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if(!p){
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printf("Remote host didn't send adat reply.\n");
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return AUTH_ERROR;
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}
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p += 5;
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len = base64_decode(p, adat.dat);
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if(len < 0){
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printf("Failed to decode base64 from server.\n");
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return AUTH_ERROR;
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}
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adat.length = len;
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ret = krb_rd_safe(adat.dat, adat.length, &d->key,
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(struct sockaddr_in *)hisctladdr,
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(struct sockaddr_in *)myctladdr, &msg_data);
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if(ret){
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printf("Error reading reply from server: %s.\n",
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krb_get_err_text(ret));
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return AUTH_ERROR;
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}
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krb_get_int(msg_data.app_data, &cs, 4, 0);
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if(cs - checksum != 1){
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printf("Bad checksum returned from server.\n");
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return AUTH_ERROR;
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}
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return AUTH_OK;
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}
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struct sec_client_mech krb4_client_mech = {
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"KERBEROS_V4",
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sizeof(struct krb4_data),
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NULL, /* init */
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krb4_auth,
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NULL, /* end */
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krb4_check_prot,
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krb4_overhead,
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krb4_encode,
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krb4_decode
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};
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#endif /* FTP_SERVER */
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void krb_kauth(struct connectdata *conn)
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{
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int ret;
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char buf[1024];
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des_cblock key;
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des_key_schedule schedule;
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KTEXT_ST tkt, tktcopy;
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char *name;
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char *p;
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int overbose;
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char passwd[100];
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int tmp;
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size_t nread;
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int save;
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save = set_command_prot(conn, prot_private);
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/*ret = command("SITE KAUTH %s", name);***/
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ftpsendf(conn->data->firstsocket, conn,
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"SITE KAUTH %s", conn->data->user);
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/* wait for feedback */
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nread = GetLastResponse(conn->data->firstsocket, conn->data->buffer, conn);
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if(nread < 0)
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return /*CURLE_OPERATION_TIMEOUTED*/;
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if(/*ret != CONTINUE*/conn->data->buffer[0] != '3'){
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/*verbose = overbose;***/
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set_command_prot(conn, save);
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/*code = -1;***/
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return;
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}
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/*verbose = overbose;***/
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p = strstr(/*reply_string***/conn->data->buffer, "T=");
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if(!p){
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printf("Bad reply from server.\n");
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set_command_prot(conn, save);
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/*code = -1;***/
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return;
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}
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p += 2;
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tmp = base64_decode(p, &tkt.dat);
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if(tmp < 0){
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printf("Failed to decode base64 in reply.\n");
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set_command_prot(conn, save);
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/*code = -1;***/
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return;
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}
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tkt.length = tmp;
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tktcopy.length = tkt.length;
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p = strstr(/*reply_string***/conn->data->buffer, "P=");
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if(!p){
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printf("Bad reply from server.\n");
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/*verbose = overbose;***/
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set_command_prot(conn, save);
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/*code = -1;***/
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return;
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}
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name = p + 2;
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for(; *p && *p != ' ' && *p != '\r' && *p != '\n'; p++);
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*p = 0;
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#if 0
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snprintf(buf, sizeof(buf), "Password for %s:", name);
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if (des_read_pw_string (passwd, sizeof(passwd)-1, buf, 0))
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*passwd = '\0';
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des_string_to_key (passwd, &key);
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#else
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des_string_to_key (conn->data->passwd, &key);
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#endif
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des_key_sched(&key, schedule);
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des_pcbc_encrypt((des_cblock*)tkt.dat, (des_cblock*)tktcopy.dat,
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tkt.length,
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schedule, &key, DES_DECRYPT);
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if (strcmp ((char*)tktcopy.dat + 8,
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KRB_TICKET_GRANTING_TICKET) != 0) {
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afs_string_to_key (passwd,
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krb_realmofhost(/*hostname***/conn->hp->h_name),
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&key);
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des_key_sched (&key, schedule);
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des_pcbc_encrypt((des_cblock*)tkt.dat, (des_cblock*)tktcopy.dat,
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tkt.length,
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schedule, &key, DES_DECRYPT);
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}
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memset(key, 0, sizeof(key));
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memset(schedule, 0, sizeof(schedule));
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memset(passwd, 0, sizeof(passwd));
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if(base64_encode(tktcopy.dat, tktcopy.length, &p) < 0) {
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failf(conn->data, "Out of memory base64-encoding.\n");
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set_command_prot(conn, save);
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/*code = -1;***/
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return;
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}
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memset (tktcopy.dat, 0, tktcopy.length);
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/*ret = command("SITE KAUTH %s %s", name, p);***/
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ftpsendf(conn->data->firstsocket, conn,
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"SITE KAUTH %s %s", name, p);
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/* wait for feedback */
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nread = GetLastResponse(conn->data->firstsocket, conn->data->buffer, conn);
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if(nread < 0)
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return /*CURLE_OPERATION_TIMEOUTED*/;
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free(p);
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set_command_prot(conn, save);
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}
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#endif /* KRB4 */
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