1 /* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
2 * use in Curl. Martin's latest changes were done 2000-09-18.
4 * It has since been patched away like a madman by Daniel Stenberg to make it
5 * better applied to curl conditions, and to make it not use globals, pollute
8 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
9 * (Royal Institute of Technology, Stockholm, Sweden).
10 * Copyright (c) 2004 - 2011 Daniel Stenberg
11 * All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the Institute nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
28 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 #include "curl_setup.h"
44 #ifndef CURL_DISABLE_FTP
54 #include "curl_base64.h"
58 #include "inet_ntop.h"
59 #include "curl_memory.h"
61 /* The last #include file should be: */
64 #define LOCAL_ADDR (&conn->local_addr)
65 #define REMOTE_ADDR conn->ip_addr->ai_addr
66 #define myctladdr LOCAL_ADDR
67 #define hisctladdr REMOTE_ADDR
71 des_key_schedule schedule;
73 char instance[INST_SZ];
78 /* if it ever goes non-static, make it Curl_ prefixed! */
80 strlcpy (char *dst, const char *src, size_t dst_sz)
86 n + 1 < dst_sz && *src != '\0';
93 return n + strlen (src);
96 size_t strlcpy (char *dst, const char *src, size_t dst_sz);
100 krb4_check_prot(void *app_data, int level)
102 app_data = NULL; /* prevent compiler warning */
103 if(level == PROT_CONFIDENTIAL)
109 krb4_decode(void *app_data, void *buf, int len, int level,
110 struct connectdata *conn)
114 struct krb4_data *d = app_data;
116 if(level == PROT_SAFE)
117 e = krb_rd_safe(buf, len, &d->key,
118 (struct sockaddr_in *)REMOTE_ADDR,
119 (struct sockaddr_in *)LOCAL_ADDR, &m);
121 e = krb_rd_priv(buf, len, d->schedule, &d->key,
122 (struct sockaddr_in *)REMOTE_ADDR,
123 (struct sockaddr_in *)LOCAL_ADDR, &m);
125 struct SessionHandle *data = conn->data;
126 infof(data, "krb4_decode: %s\n", krb_get_err_text(e));
129 memmove(buf, m.app_data, m.app_length);
134 krb4_overhead(void *app_data, int level, int len)
136 /* no arguments are used, just init them to prevent compiler warnings */
144 krb4_encode(void *app_data, const void *from, int length, int level, void **to,
145 struct connectdata *conn)
147 struct krb4_data *d = app_data;
148 *to = malloc(length + 31);
151 if(level == PROT_SAFE)
152 /* NOTE that the void* cast is safe, krb_mk_safe/priv don't modify the
155 return krb_mk_safe((void*)from, *to, length, &d->key,
156 (struct sockaddr_in *)LOCAL_ADDR,
157 (struct sockaddr_in *)REMOTE_ADDR);
158 else if(level == PROT_PRIVATE)
159 return krb_mk_priv((void*)from, *to, length, d->schedule, &d->key,
160 (struct sockaddr_in *)LOCAL_ADDR,
161 (struct sockaddr_in *)REMOTE_ADDR);
167 mk_auth(struct krb4_data *d, KTEXT adat,
168 const char *service, char *host, int checksum)
172 char sname[SNAME_SZ], inst[INST_SZ], realm[REALM_SZ];
174 strlcpy(sname, service, sizeof(sname));
175 strlcpy(inst, krb_get_phost(host), sizeof(inst));
176 strlcpy(realm, krb_realmofhost(host), sizeof(realm));
177 ret = krb_mk_req(adat, sname, inst, realm, checksum);
180 strlcpy(sname, service, sizeof(sname));
181 strlcpy(inst, krb_get_phost(host), sizeof(inst));
182 strlcpy(realm, krb_realmofhost(host), sizeof(realm));
183 ret = krb_get_cred(sname, inst, realm, &cred);
184 memmove(&d->key, &cred.session, sizeof(des_cblock));
185 des_key_sched(&d->key, d->schedule);
186 memset(&cred, 0, sizeof(cred));
190 #ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
191 int krb_get_our_ip_for_realm(char *, struct in_addr *);
195 krb4_auth(void *app_data, struct connectdata *conn)
205 struct krb4_data *d = app_data;
206 char *host = conn->host.name;
208 int l = sizeof(conn->local_addr);
209 struct SessionHandle *data = conn->data;
211 size_t base64_sz = 0;
213 if(getsockname(conn->sock[FIRSTSOCKET],
214 (struct sockaddr *)LOCAL_ADDR, &l) < 0)
215 perror("getsockname()");
218 ret = mk_auth(d, &adat, "ftp", host, checksum);
219 if(ret == KDC_PR_UNKNOWN)
220 ret = mk_auth(d, &adat, "rcmd", host, checksum);
222 infof(data, "%s\n", krb_get_err_text(ret));
223 return AUTH_CONTINUE;
226 #ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
227 if(krb_get_config_bool("nat_in_use")) {
228 struct sockaddr_in *localaddr = (struct sockaddr_in *)LOCAL_ADDR;
229 struct in_addr natAddr;
231 if(krb_get_our_ip_for_realm(krb_realmofhost(host),
232 &natAddr) != KSUCCESS
233 && krb_get_our_ip_for_realm(NULL, &natAddr) != KSUCCESS)
234 infof(data, "Can't get address for realm %s\n",
235 krb_realmofhost(host));
237 if(natAddr.s_addr != localaddr->sin_addr.s_addr) {
239 if(Curl_inet_ntop(AF_INET, natAddr, addr_buf, sizeof(addr_buf)))
240 infof(data, "Using NAT IP address (%s) for kerberos 4\n", addr_buf);
241 localaddr->sin_addr = natAddr;
247 result = Curl_base64_encode(conn->data, (char *)adat.dat, adat.length,
250 Curl_failf(data, "base64-encoding: %s", curl_easy_strerror(result));
251 return AUTH_CONTINUE;
254 result = Curl_ftpsendf(conn, "ADAT %s", p);
261 if(Curl_GetFTPResponse(&nread, conn, NULL))
264 if(data->state.buffer[0] != '2') {
265 Curl_failf(data, "Server didn't accept auth data");
269 p = strstr(data->state.buffer, "ADAT=");
271 Curl_failf(data, "Remote host didn't send adat reply");
275 result = Curl_base64_decode(p, &ptr, &len);
277 Curl_failf(data, "base64-decoding: %s", curl_easy_strerror(result));
280 if(len > sizeof(adat.dat)-1) {
286 Curl_failf(data, "Failed to decode base64 from server");
289 memcpy((char *)adat.dat, ptr, len);
292 ret = krb_rd_safe(adat.dat, adat.length, &d->key,
293 (struct sockaddr_in *)hisctladdr,
294 (struct sockaddr_in *)myctladdr, &msg_data);
296 Curl_failf(data, "Error reading reply from server: %s",
297 krb_get_err_text(ret));
300 krb_get_int(msg_data.app_data, &cs, 4, 0);
301 if(cs - checksum != 1) {
302 Curl_failf(data, "Bad checksum returned from server");
308 struct Curl_sec_client_mech Curl_krb4_client_mech = {
310 sizeof(struct krb4_data),
320 static enum protection_level
321 krb4_set_command_prot(struct connectdata *conn, enum protection_level level)
323 enum protection_level old = conn->command_prot;
324 DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
325 conn->command_prot = level;
329 CURLcode Curl_krb_kauth(struct connectdata *conn)
332 des_key_schedule schedule;
333 KTEXT_ST tkt, tktcopy;
339 enum protection_level save;
342 size_t base64_sz = 0;
344 save = krb4_set_command_prot(conn, PROT_PRIVATE);
346 result = Curl_ftpsendf(conn, "SITE KAUTH %s", conn->user);
351 result = Curl_GetFTPResponse(&nread, conn, NULL);
355 if(conn->data->state.buffer[0] != '3') {
356 krb4_set_command_prot(conn, save);
357 return CURLE_FTP_WEIRD_SERVER_REPLY;
360 p = strstr(conn->data->state.buffer, "T=");
362 Curl_failf(conn->data, "Bad reply from server");
363 krb4_set_command_prot(conn, save);
364 return CURLE_FTP_WEIRD_SERVER_REPLY;
368 result = Curl_base64_decode(p, &ptr, &tmp);
370 Curl_failf(conn->data, "base64-decoding: %s", curl_easy_strerror(result));
373 if(tmp >= sizeof(tkt.dat)) {
379 Curl_failf(conn->data, "Failed to decode base64 in reply");
380 krb4_set_command_prot(conn, save);
381 return CURLE_FTP_WEIRD_SERVER_REPLY;
383 memcpy((char *)tkt.dat, ptr, tmp);
386 tktcopy.length = tkt.length;
388 p = strstr(conn->data->state.buffer, "P=");
390 Curl_failf(conn->data, "Bad reply from server");
391 krb4_set_command_prot(conn, save);
392 return CURLE_FTP_WEIRD_SERVER_REPLY;
395 for(; *p && *p != ' ' && *p != '\r' && *p != '\n'; p++);
398 des_string_to_key (conn->passwd, &key);
399 des_key_sched(&key, schedule);
401 des_pcbc_encrypt((void *)tkt.dat, (void *)tktcopy.dat,
403 schedule, &key, DES_DECRYPT);
404 if(strcmp ((char*)tktcopy.dat + 8,
405 KRB_TICKET_GRANTING_TICKET) != 0) {
406 afs_string_to_key(passwd,
407 krb_realmofhost(conn->host.name),
409 des_key_sched(&key, schedule);
410 des_pcbc_encrypt((void *)tkt.dat, (void *)tktcopy.dat,
412 schedule, &key, DES_DECRYPT);
414 memset(key, 0, sizeof(key));
415 memset(schedule, 0, sizeof(schedule));
416 memset(passwd, 0, sizeof(passwd));
417 result = Curl_base64_encode(conn->data, (char *)tktcopy.dat, tktcopy.length,
420 Curl_failf(conn->data, "base64-encoding: %s", curl_easy_strerror(result));
421 krb4_set_command_prot(conn, save);
424 memset (tktcopy.dat, 0, tktcopy.length);
426 result = Curl_ftpsendf(conn, "SITE KAUTH %s %s", name, p);
431 result = Curl_GetFTPResponse(&nread, conn, NULL);
434 krb4_set_command_prot(conn, save);
439 #endif /* HAVE_KRB4 */
440 #endif /* CURL_DISABLE_FTP */