2 * Copyright (c) 1998 - 2005 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
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18 * may be used to endorse or promote products derived from this software
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35 #include "ftpd_locl.h"
42 RCSID("$Id: gssapi.c 21513 2007-07-12 12:45:25Z lha $");
44 int ftp_do_gss_bindings = 0;
45 int ftp_do_gss_delegate = 1;
48 gss_ctx_id_t context_hdl;
50 gss_cred_id_t delegated_cred_handle;
55 gss_init(void *app_data)
57 struct gss_data *d = app_data;
58 d->context_hdl = GSS_C_NO_CONTEXT;
59 d->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
60 #if defined(FTP_SERVER)
63 /* XXX Check the gss mechanism; with gss_indicate_mechs() ? */
69 #endif /* FTP_SERVER */
73 gss_check_prot(void *app_data, int level)
75 if(level == prot_confidential)
81 gss_decode(void *app_data, void *buf, int len, int level)
83 OM_uint32 maj_stat, min_stat;
84 gss_buffer_desc input, output;
87 struct gss_data *d = app_data;
92 maj_stat = gss_unwrap (&min_stat,
98 if(GSS_ERROR(maj_stat))
100 memmove(buf, output.value, output.length);
101 ret_len = output.length;
102 gss_release_buffer(&min_stat, &output);
107 gss_overhead(void *app_data, int level, int len)
109 return 100; /* dunno? */
114 gss_encode(void *app_data, void *from, int length, int level, void **to)
116 OM_uint32 maj_stat, min_stat;
117 gss_buffer_desc input, output;
119 struct gss_data *d = app_data;
121 input.length = length;
123 maj_stat = gss_wrap (&min_stat,
125 level == prot_private,
131 return output.length;
135 sockaddr_to_gss_address (struct sockaddr *sa,
136 OM_uint32 *addr_type,
137 gss_buffer_desc *gss_addr)
139 switch (sa->sa_family) {
142 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
144 gss_addr->length = 16;
145 gss_addr->value = &sin6->sin6_addr;
146 *addr_type = GSS_C_AF_INET6;
151 struct sockaddr_in *sin4 = (struct sockaddr_in *)sa;
153 gss_addr->length = 4;
154 gss_addr->value = &sin4->sin_addr;
155 *addr_type = GSS_C_AF_INET;
159 errx (1, "unknown address family %d", sa->sa_family);
164 /* end common stuff */
169 gss_adat(void *app_data, void *buf, size_t len)
172 gss_buffer_desc input_token, output_token;
173 OM_uint32 maj_stat, min_stat;
174 gss_name_t client_name;
175 struct gss_data *d = app_data;
176 gss_channel_bindings_t bindings;
178 if (ftp_do_gss_bindings) {
179 bindings = malloc(sizeof(*bindings));
180 if (bindings == NULL)
181 errx(1, "out of memory");
183 sockaddr_to_gss_address (his_addr,
184 &bindings->initiator_addrtype,
185 &bindings->initiator_address);
186 sockaddr_to_gss_address (ctrl_addr,
187 &bindings->acceptor_addrtype,
188 &bindings->acceptor_address);
190 bindings->application_data.length = 0;
191 bindings->application_data.value = NULL;
193 bindings = GSS_C_NO_CHANNEL_BINDINGS;
195 input_token.value = buf;
196 input_token.length = len;
198 maj_stat = gss_accept_sec_context (&min_stat,
208 &d->delegated_cred_handle);
210 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
213 if(output_token.length) {
214 if(base64_encode(output_token.value, output_token.length, &p) < 0) {
215 reply(535, "Out of memory base64-encoding.");
218 gss_release_buffer(&min_stat, &output_token);
220 if(maj_stat == GSS_S_COMPLETE){
222 gss_buffer_desc export_name;
225 maj_stat = gss_display_name(&min_stat, client_name,
228 reply(500, "Error displaying name");
232 if(oid != GSS_KRB5_NT_PRINCIPAL_NAME) {
233 reply(500, "OID not kerberos principal name");
234 gss_release_buffer(&min_stat, &export_name);
237 name = malloc(export_name.length + 1);
239 reply(500, "Out of memory");
240 gss_release_buffer(&min_stat, &export_name);
243 memcpy(name, export_name.value, export_name.length);
244 name[export_name.length] = '\0';
245 gss_release_buffer(&min_stat, &export_name);
246 d->client_name = name;
248 reply(235, "ADAT=%s", p);
250 reply(235, "ADAT Complete");
253 } else if(maj_stat == GSS_S_CONTINUE_NEEDED) {
255 reply(335, "ADAT=%s", p);
257 reply(335, "OK, need more data");
260 OM_uint32 msg_ctx = 0;
261 gss_buffer_desc status_string;
262 gss_display_status(&new_stat,
268 syslog(LOG_ERR, "gss_accept_sec_context: %s",
269 (char*)status_string.value);
270 gss_release_buffer(&new_stat, &status_string);
271 reply(431, "Security resource unavailable");
275 gss_release_name(&min_stat, &client_name);
280 int gss_userok(void*, char*);
281 int gss_session(void*, char*);
283 struct sec_server_mech gss_server_mech = {
285 sizeof(struct gss_data),
301 #else /* FTP_SERVER */
303 extern struct sockaddr *hisctladdr, *myctladdr;
306 import_name(const char *kname, const char *host, gss_name_t *target_name)
308 OM_uint32 maj_stat, min_stat;
309 gss_buffer_desc name;
312 name.length = asprintf(&str, "%s@%s", kname, host);
314 printf("Out of memory\n");
319 maj_stat = gss_import_name(&min_stat,
321 GSS_C_NT_HOSTBASED_SERVICE,
323 if (GSS_ERROR(maj_stat)) {
325 OM_uint32 msg_ctx = 0;
326 gss_buffer_desc status_string;
328 gss_display_status(&new_stat,
334 printf("Error importing name %s: %s\n",
336 (char *)status_string.value);
338 gss_release_buffer(&new_stat, &status_string);
346 gss_auth(void *app_data, char *host)
349 OM_uint32 maj_stat, min_stat;
350 gss_name_t target_name;
351 gss_buffer_desc input, output_token;
352 int context_established = 0;
355 gss_channel_bindings_t bindings;
356 struct gss_data *d = app_data;
357 OM_uint32 mech_flags = GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG;
359 const char *knames[] = { "ftp", "host", NULL }, **kname = knames;
362 if(import_name(*kname++, host, &target_name))
368 if (ftp_do_gss_bindings) {
369 bindings = malloc(sizeof(*bindings));
370 if (bindings == NULL)
371 errx(1, "out of memory");
373 sockaddr_to_gss_address (myctladdr,
374 &bindings->initiator_addrtype,
375 &bindings->initiator_address);
376 sockaddr_to_gss_address (hisctladdr,
377 &bindings->acceptor_addrtype,
378 &bindings->acceptor_address);
380 bindings->application_data.length = 0;
381 bindings->application_data.value = NULL;
383 bindings = GSS_C_NO_CHANNEL_BINDINGS;
385 if (ftp_do_gss_delegate)
386 mech_flags |= GSS_C_DELEG_FLAG;
388 while(!context_established) {
389 maj_stat = gss_init_sec_context(&min_stat,
402 if (GSS_ERROR(maj_stat)) {
404 OM_uint32 msg_ctx = 0;
405 gss_buffer_desc status_string;
407 d->context_hdl = GSS_C_NO_CONTEXT;
409 gss_release_name(&min_stat, &target_name);
413 if(import_name(*kname++, host, &target_name)) {
414 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
421 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
424 gss_display_status(&new_stat,
430 printf("Error initializing security context: %s\n",
431 (char*)status_string.value);
432 gss_release_buffer(&new_stat, &status_string);
433 return AUTH_CONTINUE;
441 if (output_token.length != 0) {
442 base64_encode(output_token.value, output_token.length, &p);
443 gss_release_buffer(&min_stat, &output_token);
444 n = command("ADAT %s", p);
447 if (GSS_ERROR(maj_stat)) {
448 if (d->context_hdl != GSS_C_NO_CONTEXT)
449 gss_delete_sec_context (&min_stat,
454 if (maj_stat & GSS_S_CONTINUE_NEEDED) {
455 p = strstr(reply_string, "ADAT=");
457 printf("Error: expected ADAT in reply. got: %s\n",
459 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
464 input.value = malloc(strlen(p));
465 input.length = base64_decode(p, input.value);
469 printf("Unrecognized response code: %d\n", code);
470 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
474 context_established = 1;
478 gss_release_name(&min_stat, &target_name);
480 if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
486 gss_name_t targ_name;
488 maj_stat = gss_inquire_context(&min_stat,
497 if (GSS_ERROR(maj_stat) == 0) {
498 gss_buffer_desc name;
499 maj_stat = gss_display_name (&min_stat,
503 if (GSS_ERROR(maj_stat) == 0) {
504 printf("Authenticated to <%s>\n", (char *)name.value);
505 gss_release_buffer(&min_stat, &name);
507 gss_release_name(&min_stat, &targ_name);
509 printf("Failed to get gss name of peer.\n");
516 struct sec_client_mech gss_client_mech = {
518 sizeof(struct gss_data),
528 #endif /* FTP_SERVER */