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 - 2010 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
44 #ifndef CURL_DISABLE_FTP
56 #include <unistd.h> /* for getpid() */
60 #include "curl_base64.h"
64 #include "inet_ntop.h"
65 #include "curl_memory.h"
67 /* The last #include file should be: */
70 #define LOCAL_ADDR (&conn->local_addr)
71 #define REMOTE_ADDR conn->ip_addr->ai_addr
72 #define myctladdr LOCAL_ADDR
73 #define hisctladdr REMOTE_ADDR
77 des_key_schedule schedule;
79 char instance[INST_SZ];
84 /* if it ever goes non-static, make it Curl_ prefixed! */
86 strlcpy (char *dst, const char *src, size_t dst_sz)
92 n + 1 < dst_sz && *src != '\0';
99 return n + strlen (src);
102 size_t strlcpy (char *dst, const char *src, size_t dst_sz);
106 krb4_check_prot(void *app_data, int level)
108 app_data = NULL; /* prevent compiler warning */
109 if(level == PROT_CONFIDENTIAL)
115 krb4_decode(void *app_data, void *buf, int len, int level,
116 struct connectdata *conn)
120 struct krb4_data *d = app_data;
122 if(level == PROT_SAFE)
123 e = krb_rd_safe(buf, len, &d->key,
124 (struct sockaddr_in *)REMOTE_ADDR,
125 (struct sockaddr_in *)LOCAL_ADDR, &m);
127 e = krb_rd_priv(buf, len, d->schedule, &d->key,
128 (struct sockaddr_in *)REMOTE_ADDR,
129 (struct sockaddr_in *)LOCAL_ADDR, &m);
131 struct SessionHandle *data = conn->data;
132 infof(data, "krb4_decode: %s\n", krb_get_err_text(e));
135 memmove(buf, m.app_data, m.app_length);
140 krb4_overhead(void *app_data, int level, int len)
142 /* no arguments are used, just init them to prevent compiler warnings */
150 krb4_encode(void *app_data, const void *from, int length, int level, void **to,
151 struct connectdata *conn)
153 struct krb4_data *d = app_data;
154 *to = malloc(length + 31);
157 if(level == PROT_SAFE)
158 /* NOTE that the void* cast is safe, krb_mk_safe/priv don't modify the
161 return krb_mk_safe((void*)from, *to, length, &d->key,
162 (struct sockaddr_in *)LOCAL_ADDR,
163 (struct sockaddr_in *)REMOTE_ADDR);
164 else if(level == PROT_PRIVATE)
165 return krb_mk_priv((void*)from, *to, length, d->schedule, &d->key,
166 (struct sockaddr_in *)LOCAL_ADDR,
167 (struct sockaddr_in *)REMOTE_ADDR);
173 mk_auth(struct krb4_data *d, KTEXT adat,
174 const char *service, char *host, int checksum)
178 char sname[SNAME_SZ], inst[INST_SZ], realm[REALM_SZ];
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_mk_req(adat, sname, inst, realm, checksum);
186 strlcpy(sname, service, sizeof(sname));
187 strlcpy(inst, krb_get_phost(host), sizeof(inst));
188 strlcpy(realm, krb_realmofhost(host), sizeof(realm));
189 ret = krb_get_cred(sname, inst, realm, &cred);
190 memmove(&d->key, &cred.session, sizeof(des_cblock));
191 des_key_sched(&d->key, d->schedule);
192 memset(&cred, 0, sizeof(cred));
196 #ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
197 int krb_get_our_ip_for_realm(char *, struct in_addr *);
201 krb4_auth(void *app_data, struct connectdata *conn)
211 struct krb4_data *d = app_data;
212 char *host = conn->host.name;
214 int l = sizeof(conn->local_addr);
215 struct SessionHandle *data = conn->data;
218 if(getsockname(conn->sock[FIRSTSOCKET],
219 (struct sockaddr *)LOCAL_ADDR, &l) < 0)
220 perror("getsockname()");
223 ret = mk_auth(d, &adat, "ftp", host, checksum);
224 if(ret == KDC_PR_UNKNOWN)
225 ret = mk_auth(d, &adat, "rcmd", host, checksum);
227 infof(data, "%s\n", krb_get_err_text(ret));
228 return AUTH_CONTINUE;
231 #ifdef HAVE_KRB_GET_OUR_IP_FOR_REALM
232 if(krb_get_config_bool("nat_in_use")) {
233 struct sockaddr_in *localaddr = (struct sockaddr_in *)LOCAL_ADDR;
234 struct in_addr natAddr;
236 if(krb_get_our_ip_for_realm(krb_realmofhost(host),
237 &natAddr) != KSUCCESS
238 && krb_get_our_ip_for_realm(NULL, &natAddr) != KSUCCESS)
239 infof(data, "Can't get address for realm %s\n",
240 krb_realmofhost(host));
242 if(natAddr.s_addr != localaddr->sin_addr.s_addr) {
244 if(Curl_inet_ntop(AF_INET, natAddr, addr_buf, sizeof(addr_buf)))
245 infof(data, "Using NAT IP address (%s) for kerberos 4\n", addr_buf);
246 localaddr->sin_addr = natAddr;
252 if(Curl_base64_encode(conn->data, (char *)adat.dat, adat.length, &p) < 1) {
253 Curl_failf(data, "Out of memory base64-encoding");
254 return AUTH_CONTINUE;
257 result = Curl_ftpsendf(conn, "ADAT %s", p);
264 if(Curl_GetFTPResponse(&nread, conn, NULL))
267 if(data->state.buffer[0] != '2'){
268 Curl_failf(data, "Server didn't accept auth data");
272 p = strstr(data->state.buffer, "ADAT=");
274 Curl_failf(data, "Remote host didn't send adat reply");
278 len = Curl_base64_decode(p, &ptr);
279 if(len > sizeof(adat.dat)-1) {
284 Curl_failf(data, "Failed to decode base64 from server");
287 memcpy((char *)adat.dat, ptr, len);
290 ret = krb_rd_safe(adat.dat, adat.length, &d->key,
291 (struct sockaddr_in *)hisctladdr,
292 (struct sockaddr_in *)myctladdr, &msg_data);
294 Curl_failf(data, "Error reading reply from server: %s",
295 krb_get_err_text(ret));
298 krb_get_int(msg_data.app_data, &cs, 4, 0);
299 if(cs - checksum != 1) {
300 Curl_failf(data, "Bad checksum returned from server");
306 struct Curl_sec_client_mech Curl_krb4_client_mech = {
308 sizeof(struct krb4_data),
318 static enum protection_level
319 krb4_set_command_prot(struct connectdata *conn, enum protection_level level)
321 enum protection_level old = conn->command_prot;
322 DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
323 conn->command_prot = level;
327 CURLcode Curl_krb_kauth(struct connectdata *conn)
330 des_key_schedule schedule;
331 KTEXT_ST tkt, tktcopy;
337 enum protection_level save;
341 save = krb4_set_command_prot(conn, PROT_PRIVATE);
343 result = Curl_ftpsendf(conn, "SITE KAUTH %s", conn->user);
348 result = Curl_GetFTPResponse(&nread, conn, NULL);
352 if(conn->data->state.buffer[0] != '3'){
353 krb4_set_command_prot(conn, save);
354 return CURLE_FTP_WEIRD_SERVER_REPLY;
357 p = strstr(conn->data->state.buffer, "T=");
359 Curl_failf(conn->data, "Bad reply from server");
360 krb4_set_command_prot(conn, save);
361 return CURLE_FTP_WEIRD_SERVER_REPLY;
365 tmp = Curl_base64_decode(p, &ptr);
366 if(tmp >= sizeof(tkt.dat)) {
371 Curl_failf(conn->data, "Failed to decode base64 in reply");
372 krb4_set_command_prot(conn, save);
373 return CURLE_FTP_WEIRD_SERVER_REPLY;
375 memcpy((char *)tkt.dat, ptr, tmp);
378 tktcopy.length = tkt.length;
380 p = strstr(conn->data->state.buffer, "P=");
382 Curl_failf(conn->data, "Bad reply from server");
383 krb4_set_command_prot(conn, save);
384 return CURLE_FTP_WEIRD_SERVER_REPLY;
387 for(; *p && *p != ' ' && *p != '\r' && *p != '\n'; p++);
390 des_string_to_key (conn->passwd, &key);
391 des_key_sched(&key, schedule);
393 des_pcbc_encrypt((void *)tkt.dat, (void *)tktcopy.dat,
395 schedule, &key, DES_DECRYPT);
396 if(strcmp ((char*)tktcopy.dat + 8,
397 KRB_TICKET_GRANTING_TICKET) != 0) {
398 afs_string_to_key(passwd,
399 krb_realmofhost(conn->host.name),
401 des_key_sched(&key, schedule);
402 des_pcbc_encrypt((void *)tkt.dat, (void *)tktcopy.dat,
404 schedule, &key, DES_DECRYPT);
406 memset(key, 0, sizeof(key));
407 memset(schedule, 0, sizeof(schedule));
408 memset(passwd, 0, sizeof(passwd));
409 if(Curl_base64_encode(conn->data, (char *)tktcopy.dat, tktcopy.length, &p)
411 failf(conn->data, "Out of memory base64-encoding.");
412 krb4_set_command_prot(conn, save);
413 return CURLE_OUT_OF_MEMORY;
415 memset (tktcopy.dat, 0, tktcopy.length);
417 result = Curl_ftpsendf(conn, "SITE KAUTH %s %s", name, p);
422 result = Curl_GetFTPResponse(&nread, conn, NULL);
425 krb4_set_command_prot(conn, save);
430 #endif /* HAVE_KRB4 */
431 #endif /* CURL_DISABLE_FTP */