1 /* GSSAPI/krb5 support for FTP - loosely based on old krb4.c
3 * Copyright (c) 1995, 1996, 1997, 1998, 1999, 2010 Kungliga Tekniska Högskolan
4 * (Royal Institute of Technology, Stockholm, Sweden).
5 * Copyright (c) 2004 - 2009 Daniel Stenberg
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #ifndef CURL_DISABLE_FTP
40 #ifdef HAVE_OLD_GSSMIT
41 #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
52 #elif defined HAVE_GSSMIT
54 # include <gssapi/gssapi.h>
55 # include <gssapi/gssapi_generic.h>
56 # include <gssapi/gssapi_krb5.h>
63 #include "curl_base64.h"
67 #include "curl_memory.h"
69 #define _MPRINTF_REPLACE /* use our functions only */
70 #include <curl/mprintf.h>
72 /* The last #include file should be: */
75 #define LOCAL_ADDR (&conn->local_addr)
76 #define REMOTE_ADDR conn->ip_addr->ai_addr
79 krb5_check_prot(void *app_data, int level)
81 app_data = NULL; /* prevent compiler warning */
82 if(level == prot_confidential)
88 krb5_decode(void *app_data, void *buf, int len, int level,
89 struct connectdata *conn)
91 gss_ctx_id_t *context = app_data;
93 gss_buffer_desc enc, dec;
101 maj = gss_unseal(&min, *context, &enc, &dec, NULL, NULL);
102 if(maj != GSS_S_COMPLETE) {
108 memcpy(buf, dec.value, dec.length);
110 gss_release_buffer(&min, &dec);
116 krb5_overhead(void *app_data, int level, int len)
118 /* no arguments are used, just init them to prevent compiler warnings */
126 krb5_encode(void *app_data, const void *from, int length, int level, void **to,
127 struct connectdata *conn)
129 gss_ctx_id_t *context = app_data;
130 gss_buffer_desc dec, enc;
138 /* NOTE that the cast is safe, neither of the krb5, gnu gss and heimdal
139 * libraries modify the input buffer in gss_seal()
141 dec.value = (void*)from;
143 maj = gss_seal(&min, *context,
144 level == prot_private,
148 if(maj != GSS_S_COMPLETE)
151 /* malloc a new buffer, in case gss_release_buffer doesn't work as expected */
152 *to = malloc(enc.length);
155 memcpy(*to, enc.value, enc.length);
157 gss_release_buffer(&min, &enc);
162 krb5_auth(void *app_data, struct connectdata *conn)
166 const char *host = conn->host.name;
168 curl_socklen_t l = sizeof(conn->local_addr);
169 struct SessionHandle *data = conn->data;
171 const char *service = "ftp", *srv_host = "host";
172 gss_buffer_desc gssbuf, _gssresp, *gssresp;
175 gss_ctx_id_t *context = app_data;
176 struct gss_channel_bindings_struct chan;
178 if(getsockname(conn->sock[FIRSTSOCKET],
179 (struct sockaddr *)LOCAL_ADDR, &l) < 0)
180 perror("getsockname()");
182 chan.initiator_addrtype = GSS_C_AF_INET;
183 chan.initiator_address.length = l - 4;
184 chan.initiator_address.value =
185 &((struct sockaddr_in *)LOCAL_ADDR)->sin_addr.s_addr;
186 chan.acceptor_addrtype = GSS_C_AF_INET;
187 chan.acceptor_address.length = l - 4;
188 chan.acceptor_address.value =
189 &((struct sockaddr_in *)REMOTE_ADDR)->sin_addr.s_addr;
190 chan.application_data.length = 0;
191 chan.application_data.value = NULL;
193 /* this loop will execute twice (once for service, once for host) */
195 /* this really shouldn't be repeated here, but can't help it */
196 if(service == srv_host) {
197 result = Curl_ftpsendf(conn, "AUTH GSSAPI");
201 if(Curl_GetFTPResponse(&nread, conn, NULL))
204 if(data->state.buffer[0] != '3')
208 gssbuf.value = data->state.buffer;
209 gssbuf.length = snprintf(gssbuf.value, BUFSIZE, "%s@%s", service, host);
210 maj = gss_import_name(&min, &gssbuf, GSS_C_NT_HOSTBASED_SERVICE, &gssname);
211 if(maj != GSS_S_COMPLETE) {
212 gss_release_name(&min, &gssname);
213 if(service == srv_host) {
214 Curl_failf(data, "Error importing service name %s", gssbuf.value);
221 /* We pass NULL as |output_name_type| to avoid a leak. */
222 gss_display_name(&min, gssname, &gssbuf, NULL);
223 Curl_infof(data, "Trying against %s\n", gssbuf.value);
224 gss_release_buffer(&min, &gssbuf);
226 gssresp = GSS_C_NO_BUFFER;
227 *context = GSS_C_NO_CONTEXT;
231 maj = gss_init_sec_context(&min,
236 GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG,
246 free(_gssresp.value);
250 if(maj != GSS_S_COMPLETE && maj != GSS_S_CONTINUE_NEEDED) {
251 Curl_infof(data, "Error creating security context");
256 if(gssbuf.length != 0) {
257 if(Curl_base64_encode(data, (char *)gssbuf.value, gssbuf.length, &p)
259 Curl_infof(data, "Out of memory base64-encoding");
264 result = Curl_ftpsendf(conn, "ADAT %s", p);
273 if(Curl_GetFTPResponse(&nread, conn, NULL)) {
278 if(data->state.buffer[0] != '2' && data->state.buffer[0] != '3'){
279 Curl_infof(data, "Server didn't accept auth data\n");
284 p = data->state.buffer + 4;
285 p = strstr(p, "ADAT=");
287 _gssresp.length = Curl_base64_decode(p + 5, (unsigned char **)
289 if(_gssresp.length < 1) {
290 Curl_failf(data, "Out of memory base64-encoding");
298 } while(maj == GSS_S_CONTINUE_NEEDED);
300 gss_release_name(&min, &gssname);
303 free(_gssresp.value);
305 if(ret == AUTH_OK || service == srv_host)
312 struct Curl_sec_client_mech Curl_krb5_client_mech = {
314 sizeof(gss_ctx_id_t),
324 #endif /* HAVE_GSSAPI */
325 #endif /* CURL_DISABLE_FTP */