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curl/lib/krb4.c
Daniel Stenberg 62970da675 Removed security.h since it shadows an include file mingw needs when building
for SSPI support. The contents of the file has been moved into the krb4.h file.
2005-03-14 00:00:45 +00:00

423 lines
12 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 HAVE_KRB4
#include <stdlib.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#include <string.h>
#include <krb.h>
#include <des.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for getpid() */
#endif
#include "urldata.h"
#include "base64.h"
#include "ftp.h"
#include "sendf.h"
#include "krb4.h"
#include "memory.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: */
#include "memdebug.h"
#define LOCAL_ADDR (&conn->local_addr)
#define REMOTE_ADDR conn->ip_addr->ai_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) {
struct SessionHandle *data = conn->data;
infof(data, "krb4_decode: %s\n", 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;
}
#ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
int krb_get_our_ip_for_realm(char *, struct in_addr *);
#endif
static int
krb4_auth(void *app_data, struct connectdata *conn)
{
int ret;
char *p;
unsigned char *ptr;
size_t len;
KTEXT_ST adat;
MSG_DAT msg_data;
int checksum;
u_int32_t cs;
struct krb4_data *d = app_data;
char *host = conn->host.name;
ssize_t nread;
int l = sizeof(conn->local_addr);
struct SessionHandle *data = conn->data;
CURLcode result;
if(getsockname(conn->sock[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) {
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)
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
infof(data, "Using NAT IP address (%s) for kerberos 4\n", ip);
localaddr->sin_addr = natAddr;
}
}
}
#endif
if(Curl_base64_encode((char *)adat.dat, adat.length, &p) < 1) {
Curl_failf(data, "Out of memory base64-encoding");
return AUTH_CONTINUE;
}
result = Curl_ftpsendf(conn, "ADAT %s", p);
free(p);
if(result)
return -2;
if(Curl_GetFTPResponse(&nread, conn, NULL))
return -1;
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, &ptr);
if(len > sizeof(adat.dat)-1) {
free(ptr);
len=0;
}
if(!len || !ptr) {
Curl_failf(data, "Failed to decode base64 from server");
return AUTH_ERROR;
}
memcpy((char *)adat.dat, ptr, len);
free(ptr);
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
};
CURLcode Curl_krb_kauth(struct connectdata *conn)
{
des_cblock key;
des_key_schedule schedule;
KTEXT_ST tkt, tktcopy;
char *name;
char *p;
char passwd[100];
size_t tmp;
ssize_t nread;
int save;
CURLcode result;
unsigned char *ptr;
save = Curl_set_command_prot(conn, prot_private);
result = Curl_ftpsendf(conn, "SITE KAUTH %s", conn->user);
if(result)
return result;
result = Curl_GetFTPResponse(&nread, conn, NULL);
if(result)
return result;
if(conn->data->state.buffer[0] != '3'){
Curl_set_command_prot(conn, save);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
p = strstr(conn->data->state.buffer, "T=");
if(!p) {
Curl_failf(conn->data, "Bad reply from server");
Curl_set_command_prot(conn, save);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
p += 2;
tmp = Curl_base64_decode(p, &ptr);
if(tmp >= sizeof(tkt.dat)) {
free(ptr);
tmp=0;
}
if(!tmp || !ptr) {
Curl_failf(conn->data, "Failed to decode base64 in reply.\n");
Curl_set_command_prot(conn, save);
return CURLE_FTP_WEIRD_SERVER_REPLY;
}
memcpy((char *)tkt.dat, ptr, tmp);
free(ptr);
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 CURLE_FTP_WEIRD_SERVER_REPLY;
}
name = p + 2;
for(; *p && *p != ' ' && *p != '\r' && *p != '\n'; p++);
*p = 0;
des_string_to_key (conn->passwd, &key);
des_key_sched(&key, schedule);
des_pcbc_encrypt((void *)tkt.dat, (void *)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->host.name),
&key);
des_key_sched(&key, schedule);
des_pcbc_encrypt((void *)tkt.dat, (void *)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((char *)tktcopy.dat, tktcopy.length, &p) < 1) {
failf(conn->data, "Out of memory base64-encoding.");
Curl_set_command_prot(conn, save);
return CURLE_OUT_OF_MEMORY;
}
memset (tktcopy.dat, 0, tktcopy.length);
result = Curl_ftpsendf(conn, "SITE KAUTH %s %s", name, p);
free(p);
if(result)
return result;
result = Curl_GetFTPResponse(&nread, conn, NULL);
if(result)
return result;
Curl_set_command_prot(conn, save);
return CURLE_OK;
}
#endif /* HAVE_KRB4 */
#endif /* CURL_DISABLE_FTP */