404 lines
11 KiB
C
404 lines
11 KiB
C
/* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
|
|
* use in Curl. His latest changes were done 2000-09-18.
|
|
*
|
|
* It has since been patched away like a madman by Daniel Stenberg
|
|
* <daniel@haxx.se> to make it better applied to curl conditions, and to make
|
|
* it not use globals, pollute name space and more. This source code awaits a
|
|
* rewrite to work around the paragraph 2 in the BSD licenses as explained
|
|
* below.
|
|
*
|
|
* Copyright (c) 1995, 1996, 1997, 1998, 1999 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. 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 "setup.h"
|
|
|
|
#ifndef CURL_DISABLE_FTP
|
|
#ifdef KRB4
|
|
|
|
#include "security.h"
|
|
#include "base64.h"
|
|
#include <stdlib.h>
|
|
#include <netdb.h>
|
|
#include <syslog.h>
|
|
#include <string.h>
|
|
#include <krb.h>
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h> /* for getpid() */
|
|
#endif
|
|
|
|
#include "ftp.h"
|
|
#include "sendf.h"
|
|
|
|
#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
|
|
#include "inet_ntoa_r.h"
|
|
#endif
|
|
|
|
/* The last #include file should be: */
|
|
#ifdef MALLOCDEBUG
|
|
#include "memdebug.h"
|
|
#endif
|
|
|
|
#define LOCAL_ADDR (&conn->local_addr)
|
|
#define REMOTE_ADDR (&conn->serv_addr)
|
|
#define myctladdr LOCAL_ADDR
|
|
#define hisctladdr REMOTE_ADDR
|
|
|
|
struct krb4_data {
|
|
des_cblock key;
|
|
des_key_schedule schedule;
|
|
char name[ANAME_SZ];
|
|
char instance[INST_SZ];
|
|
char realm[REALM_SZ];
|
|
};
|
|
|
|
#ifndef HAVE_STRLCPY
|
|
/* if it ever goes non-static, make it Curl_ prefixed! */
|
|
static size_t
|
|
strlcpy (char *dst, const char *src, size_t dst_sz)
|
|
{
|
|
size_t n;
|
|
char *p;
|
|
|
|
for (p = dst, n = 0;
|
|
n + 1 < dst_sz && *src != '\0';
|
|
++p, ++src, ++n)
|
|
*p = *src;
|
|
*p = '\0';
|
|
if (*src == '\0')
|
|
return n;
|
|
else
|
|
return n + strlen (src);
|
|
}
|
|
#else
|
|
size_t strlcpy (char *dst, const char *src, size_t dst_sz);
|
|
#endif
|
|
|
|
static int
|
|
krb4_check_prot(void *app_data, int level)
|
|
{
|
|
app_data = NULL; /* prevent compiler warning */
|
|
if(level == prot_confidential)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
krb4_decode(void *app_data, void *buf, int len, int level,
|
|
struct connectdata *conn)
|
|
{
|
|
MSG_DAT m;
|
|
int e;
|
|
struct krb4_data *d = app_data;
|
|
|
|
if(level == prot_safe)
|
|
e = krb_rd_safe(buf, len, &d->key,
|
|
(struct sockaddr_in *)REMOTE_ADDR,
|
|
(struct sockaddr_in *)LOCAL_ADDR, &m);
|
|
else
|
|
e = krb_rd_priv(buf, len, d->schedule, &d->key,
|
|
(struct sockaddr_in *)REMOTE_ADDR,
|
|
(struct sockaddr_in *)LOCAL_ADDR, &m);
|
|
if(e){
|
|
syslog(LOG_ERR, "krb4_decode: %s", krb_get_err_text(e));
|
|
return -1;
|
|
}
|
|
memmove(buf, m.app_data, m.app_length);
|
|
return m.app_length;
|
|
}
|
|
|
|
static int
|
|
krb4_overhead(void *app_data, int level, int len)
|
|
{
|
|
/* no arguments are used, just init them to prevent compiler warnings */
|
|
app_data = NULL;
|
|
level = 0;
|
|
len = 0;
|
|
return 31;
|
|
}
|
|
|
|
static int
|
|
krb4_encode(void *app_data, void *from, int length, int level, void **to,
|
|
struct connectdata *conn)
|
|
{
|
|
struct krb4_data *d = app_data;
|
|
*to = malloc(length + 31);
|
|
if(level == prot_safe)
|
|
return krb_mk_safe(from, *to, length, &d->key,
|
|
(struct sockaddr_in *)LOCAL_ADDR,
|
|
(struct sockaddr_in *)REMOTE_ADDR);
|
|
else if(level == prot_private)
|
|
return krb_mk_priv(from, *to, length, d->schedule, &d->key,
|
|
(struct sockaddr_in *)LOCAL_ADDR,
|
|
(struct sockaddr_in *)REMOTE_ADDR);
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
mk_auth(struct krb4_data *d, KTEXT adat,
|
|
const char *service, char *host, int checksum)
|
|
{
|
|
int ret;
|
|
CREDENTIALS cred;
|
|
char sname[SNAME_SZ], inst[INST_SZ], realm[REALM_SZ];
|
|
|
|
strlcpy(sname, service, sizeof(sname));
|
|
strlcpy(inst, krb_get_phost(host), sizeof(inst));
|
|
strlcpy(realm, krb_realmofhost(host), sizeof(realm));
|
|
ret = krb_mk_req(adat, sname, inst, realm, checksum);
|
|
if(ret)
|
|
return ret;
|
|
strlcpy(sname, service, sizeof(sname));
|
|
strlcpy(inst, krb_get_phost(host), sizeof(inst));
|
|
strlcpy(realm, krb_realmofhost(host), sizeof(realm));
|
|
ret = krb_get_cred(sname, inst, realm, &cred);
|
|
memmove(&d->key, &cred.session, sizeof(des_cblock));
|
|
des_key_sched(&d->key, d->schedule);
|
|
memset(&cred, 0, sizeof(cred));
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
krb4_auth(void *app_data, struct connectdata *conn)
|
|
{
|
|
int ret;
|
|
char *p;
|
|
int len;
|
|
KTEXT_ST adat;
|
|
MSG_DAT msg_data;
|
|
int checksum;
|
|
u_int32_t cs;
|
|
struct krb4_data *d = app_data;
|
|
char *host = conn->hostname;
|
|
ssize_t nread;
|
|
int l = sizeof(conn->local_addr);
|
|
struct SessionHandle *data = conn->data;
|
|
|
|
if(getsockname(conn->firstsocket,
|
|
(struct sockaddr *)LOCAL_ADDR, &l) < 0)
|
|
perror("getsockname()");
|
|
|
|
checksum = getpid();
|
|
ret = mk_auth(d, &adat, "ftp", host, checksum);
|
|
if(ret == KDC_PR_UNKNOWN)
|
|
ret = mk_auth(d, &adat, "rcmd", host, checksum);
|
|
if(ret) {
|
|
Curl_infof(data, "%s\n", krb_get_err_text(ret));
|
|
return AUTH_CONTINUE;
|
|
}
|
|
|
|
#ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
|
|
if (krb_get_config_bool("nat_in_use")) {
|
|
struct sockaddr_in *localaddr = (struct sockaddr_in *)LOCAL_ADDR;
|
|
struct in_addr natAddr;
|
|
|
|
if (krb_get_our_ip_for_realm(krb_realmofhost(host),
|
|
&natAddr) != KSUCCESS
|
|
&& krb_get_our_ip_for_realm(NULL, &natAddr) != KSUCCESS)
|
|
Curl_infof(data, "Can't get address for realm %s\n",
|
|
krb_realmofhost(host));
|
|
else {
|
|
if (natAddr.s_addr != localaddr->sin_addr.s_addr) {
|
|
#ifdef HAVE_INET_NTOA_R
|
|
char ntoa_buf[64];
|
|
char *ip = (char *)inet_ntoa_r(natAddr, ntoa_buf, sizeof(ntoa_buf));
|
|
#else
|
|
char *ip = (char *)inet_ntoa(natAddr);
|
|
#endif
|
|
Curl_infof(data, "Using NAT IP address (%s) for kerberos 4\n", ip);
|
|
localaddr->sin_addr = natAddr;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(Curl_base64_encode(adat.dat, adat.length, &p) < 0) {
|
|
Curl_failf(data, "Out of memory base64-encoding");
|
|
return AUTH_CONTINUE;
|
|
}
|
|
|
|
if(Curl_ftpsendf(conn, "ADAT %s", p))
|
|
return -2;
|
|
|
|
nread = Curl_GetFTPResponse(data->state.buffer, conn, NULL);
|
|
if(nread < 0)
|
|
return -1;
|
|
free(p);
|
|
|
|
if(data->state.buffer[0] != '2'){
|
|
Curl_failf(data, "Server didn't accept auth data");
|
|
return AUTH_ERROR;
|
|
}
|
|
|
|
p = strstr(data->state.buffer, "ADAT=");
|
|
if(!p) {
|
|
Curl_failf(data, "Remote host didn't send adat reply");
|
|
return AUTH_ERROR;
|
|
}
|
|
p += 5;
|
|
len = Curl_base64_decode(p, adat.dat);
|
|
if(len < 0) {
|
|
Curl_failf(data, "Failed to decode base64 from server");
|
|
return AUTH_ERROR;
|
|
}
|
|
adat.length = len;
|
|
ret = krb_rd_safe(adat.dat, adat.length, &d->key,
|
|
(struct sockaddr_in *)hisctladdr,
|
|
(struct sockaddr_in *)myctladdr, &msg_data);
|
|
if(ret) {
|
|
Curl_failf(data, "Error reading reply from server: %s",
|
|
krb_get_err_text(ret));
|
|
return AUTH_ERROR;
|
|
}
|
|
krb_get_int(msg_data.app_data, &cs, 4, 0);
|
|
if(cs - checksum != 1) {
|
|
Curl_failf(data, "Bad checksum returned from server");
|
|
return AUTH_ERROR;
|
|
}
|
|
return AUTH_OK;
|
|
}
|
|
|
|
struct Curl_sec_client_mech Curl_krb4_client_mech = {
|
|
"KERBEROS_V4",
|
|
sizeof(struct krb4_data),
|
|
NULL, /* init */
|
|
krb4_auth,
|
|
NULL, /* end */
|
|
krb4_check_prot,
|
|
krb4_overhead,
|
|
krb4_encode,
|
|
krb4_decode
|
|
};
|
|
|
|
void Curl_krb_kauth(struct connectdata *conn)
|
|
{
|
|
des_cblock key;
|
|
des_key_schedule schedule;
|
|
KTEXT_ST tkt, tktcopy;
|
|
char *name;
|
|
char *p;
|
|
char passwd[100];
|
|
int tmp;
|
|
ssize_t nread;
|
|
|
|
int save;
|
|
|
|
save = Curl_set_command_prot(conn, prot_private);
|
|
|
|
if(Curl_ftpsendf(conn, "SITE KAUTH %s", conn->data->state.user))
|
|
return;
|
|
|
|
nread = Curl_GetFTPResponse(conn->data->state.buffer,
|
|
conn, NULL);
|
|
if(nread < 0)
|
|
return /*CURLE_OPERATION_TIMEOUTED*/;
|
|
|
|
if(conn->data->state.buffer[0] != '3'){
|
|
Curl_set_command_prot(conn, save);
|
|
return;
|
|
}
|
|
|
|
p = strstr(conn->data->state.buffer, "T=");
|
|
if(!p) {
|
|
Curl_failf(conn->data, "Bad reply from server");
|
|
Curl_set_command_prot(conn, save);
|
|
return;
|
|
}
|
|
|
|
p += 2;
|
|
tmp = Curl_base64_decode(p, &tkt.dat);
|
|
if(tmp < 0) {
|
|
Curl_failf(conn->data, "Failed to decode base64 in reply.\n");
|
|
Curl_set_command_prot(conn, save);
|
|
return;
|
|
}
|
|
tkt.length = tmp;
|
|
tktcopy.length = tkt.length;
|
|
|
|
p = strstr(conn->data->state.buffer, "P=");
|
|
if(!p) {
|
|
Curl_failf(conn->data, "Bad reply from server");
|
|
Curl_set_command_prot(conn, save);
|
|
return;
|
|
}
|
|
name = p + 2;
|
|
for(; *p && *p != ' ' && *p != '\r' && *p != '\n'; p++);
|
|
*p = 0;
|
|
|
|
des_string_to_key (conn->data->state.passwd, &key);
|
|
des_key_sched(&key, schedule);
|
|
|
|
des_pcbc_encrypt((des_cblock*)tkt.dat, (des_cblock*)tktcopy.dat,
|
|
tkt.length,
|
|
schedule, &key, DES_DECRYPT);
|
|
if (strcmp ((char*)tktcopy.dat + 8,
|
|
KRB_TICKET_GRANTING_TICKET) != 0) {
|
|
afs_string_to_key (passwd,
|
|
krb_realmofhost(conn->hostname),
|
|
&key);
|
|
des_key_sched (&key, schedule);
|
|
des_pcbc_encrypt((des_cblock*)tkt.dat, (des_cblock*)tktcopy.dat,
|
|
tkt.length,
|
|
schedule, &key, DES_DECRYPT);
|
|
}
|
|
memset(key, 0, sizeof(key));
|
|
memset(schedule, 0, sizeof(schedule));
|
|
memset(passwd, 0, sizeof(passwd));
|
|
if(Curl_base64_encode(tktcopy.dat, tktcopy.length, &p) < 0) {
|
|
failf(conn->data, "Out of memory base64-encoding.");
|
|
Curl_set_command_prot(conn, save);
|
|
return;
|
|
}
|
|
memset (tktcopy.dat, 0, tktcopy.length);
|
|
|
|
if(Curl_ftpsendf(conn, "SITE KAUTH %s %s", name, p))
|
|
return;
|
|
|
|
nread = Curl_GetFTPResponse(conn->data->state.buffer,
|
|
conn, NULL);
|
|
if(nread < 0)
|
|
return /*CURLE_OPERATION_TIMEOUTED*/;
|
|
free(p);
|
|
Curl_set_command_prot(conn, save);
|
|
}
|
|
|
|
#endif /* KRB4 */
|
|
#endif /* CURL_DISABLE_FTP */
|
|
|
|
/*
|
|
* local variables:
|
|
* eval: (load-file "../curl-mode.el")
|
|
* end:
|
|
* vim600: fdm=marker
|
|
* vim: et sw=2 ts=2 sts=2 tw=78
|
|
*/
|