6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 * Copyright 2002,2006 The FreeRADIUS server project
21 * Copyright 2002 Alan DeKok <aland@ox.org>
24 #include <freeradius-devel/ident.h>
27 #include <freeradius-devel/radiusd.h>
28 #include <freeradius-devel/modules.h>
31 * Define a structure for our module configuration.
33 typedef struct rlm_exec_t {
41 unsigned int packet_code;
46 * A mapping of configuration file names to internal variables.
48 * Note that the string is dynamically allocated, so it MUST
49 * be freed. When the configuration file parse re-reads the string,
50 * it free's the old one, and strdup's the new one, placing the pointer
51 * to the strdup'd string into 'config.string'. This gets around
54 static const CONF_PARSER module_config[] = {
55 { "wait", PW_TYPE_BOOLEAN, offsetof(rlm_exec_t,wait), NULL, "yes" },
56 { "program", PW_TYPE_STRING_PTR,
57 offsetof(rlm_exec_t,program), NULL, NULL },
58 { "input_pairs", PW_TYPE_STRING_PTR,
59 offsetof(rlm_exec_t,input), NULL, "request" },
60 { "output_pairs", PW_TYPE_STRING_PTR,
61 offsetof(rlm_exec_t,output), NULL, NULL },
62 { "packet_type", PW_TYPE_STRING_PTR,
63 offsetof(rlm_exec_t,packet_type), NULL, NULL },
64 { "shell_escape", PW_TYPE_BOOLEAN, offsetof(rlm_exec_t,shell_escape), NULL, "yes" },
65 { NULL, -1, 0, NULL, NULL } /* end the list */
70 * Decode the configuration file string to a pointer to
71 * a value-pair list in the REQUEST data structure.
73 static VALUE_PAIR **decode_string(REQUEST *request, const char *string)
75 if (!string) return NULL;
78 * Yuck. We need a 'switch' over character strings
81 if (strcmp(string, "request") == 0) {
82 return &request->packet->vps;
85 if (strcmp(string, "reply") == 0) {
86 if (!request->reply) return NULL;
88 return &request->reply->vps;
91 if (strcmp(string, "proxy-request") == 0) {
92 if (!request->proxy) return NULL;
94 return &request->proxy->vps;
97 if (strcmp(string, "proxy-reply") == 0) {
98 if (!request->proxy_reply) return NULL;
100 return &request->proxy_reply->vps;
103 if (strcmp(string, "config") == 0) {
104 return &request->config_items;
107 if (strcmp(string, "none") == 0) {
116 * Do xlat of strings.
118 static size_t exec_xlat(void *instance, REQUEST *request,
119 char *fmt, char *out, size_t outlen,
120 UNUSED RADIUS_ESCAPE_STRING func)
123 rlm_exec_t *inst = instance;
124 VALUE_PAIR **input_pairs;
127 input_pairs = decode_string(request, inst->input);
129 radlog(L_ERR, "rlm_exec (%s): Failed to find input pairs for xlat",
136 * FIXME: Do xlat of program name?
138 RDEBUG2("Executing %s", fmt);
139 result = radius_exec_program(fmt, request, inst->wait,
140 out, outlen, *input_pairs, NULL, inst->shell_escape);
141 RDEBUG2("result %d", result);
147 for (p = out; *p != '\0'; p++) {
148 if (*p < ' ') *p = ' ';
156 * Detach an instance and free it's data.
158 static int exec_detach(void *instance)
160 rlm_exec_t *inst = instance;
162 if (inst->xlat_name) {
163 xlat_unregister(inst->xlat_name, exec_xlat);
164 free(inst->xlat_name);
173 * Do any per-module initialization that is separate to each
174 * configured instance of the module. e.g. set up connections
175 * to external databases, read configuration files, set up
176 * dictionary entries, etc.
178 * If configuration information is given in the config section
179 * that must be referenced in later calls, store a handle to it
180 * in *instance otherwise put a null pointer there.
182 static int exec_instantiate(CONF_SECTION *conf, void **instance)
185 const char *xlat_name;
188 * Set up a storage area for instance data
191 inst = rad_malloc(sizeof(rlm_exec_t));
194 memset(inst, 0, sizeof(rlm_exec_t));
197 * If the configuration parameters can't be parsed, then
200 if (cf_section_parse(conf, inst, module_config) < 0) {
201 radlog(L_ERR, "rlm_exec: Failed parsing the configuration");
207 * No input pairs defined. Why are we executing a program?
210 radlog(L_ERR, "rlm_exec: Must define input pairs for external program.");
216 * Sanity check the config. If we're told to NOT wait,
217 * then the output pairs must not be defined.
220 (inst->output != NULL)) {
221 radlog(L_ERR, "rlm_exec: Cannot read output pairs if wait=no");
227 * Get the packet type on which to execute
229 if (!inst->packet_type) {
230 inst->packet_code = 0;
234 dval = dict_valbyname(PW_PACKET_TYPE, 0, inst->packet_type);
236 radlog(L_ERR, "rlm_exec: Unknown packet type %s: See list of VALUEs for Packet-Type in share/dictionary", inst->packet_type);
240 inst->packet_code = dval->value;
243 xlat_name = cf_section_name2(conf);
244 if (xlat_name == NULL) {
245 xlat_name = cf_section_name1(conf);
249 inst->xlat_name = strdup(xlat_name);
250 xlat_register(xlat_name, exec_xlat, inst);
260 * Dispatch an exec method
262 static int exec_dispatch(void *instance, REQUEST *request)
265 VALUE_PAIR **input_pairs, **output_pairs;
267 rlm_exec_t *inst = (rlm_exec_t *) instance;
270 * We need a program to execute.
272 if (!inst->program) {
273 radlog(L_ERR, "rlm_exec (%s): We require a program to execute",
275 return RLM_MODULE_FAIL;
279 * See if we're supposed to execute it now.
281 if (!((inst->packet_code == 0) ||
282 (request->packet->code == inst->packet_code) ||
283 (request->reply->code == inst->packet_code) ||
285 (request->proxy->code == inst->packet_code)) ||
286 (request->proxy_reply &&
287 (request->proxy_reply->code == inst->packet_code)))) {
288 RDEBUG2("Packet type is not %s. Not executing.",
290 return RLM_MODULE_NOOP;
294 * Decide what input/output the program takes.
296 input_pairs = decode_string(request, inst->input);
297 output_pairs = decode_string(request, inst->output);
300 RDEBUG2("WARNING: Possible parse error in %s",
302 return RLM_MODULE_NOOP;
306 * It points to the attribute list, but the attribute
310 RDEBUG2("WARNING! Input pairs are empty. No attributes will be passed to the script");
314 * This function does it's own xlat of the input program
317 * FIXME: if inst->program starts with %{, then
318 * do an xlat ourselves. This will allow us to do
319 * program = %{Exec-Program}, which this module
320 * xlat's into it's string value, and then the
321 * exec program function xlat's it's string value
322 * into something else.
324 result = radius_exec_program(inst->program, request,
326 *input_pairs, &answer, inst->shell_escape);
328 radlog(L_ERR, "rlm_exec (%s): External script failed",
330 return RLM_MODULE_FAIL;
334 * Move the answer over to the output pairs.
336 * If we're not waiting, then there are no output pairs.
338 if (output_pairs) pairmove(output_pairs, &answer);
343 return RLM_MODULE_OK;
345 if (result > RLM_MODULE_NUMCODES) {
346 return RLM_MODULE_FAIL;
353 * First, look for Exec-Program && Exec-Program-Wait.
355 * Then, call exec_dispatch.
357 static int exec_postauth(void *instance, REQUEST *request)
361 VALUE_PAIR *vp, *tmp;
362 rlm_exec_t *inst = (rlm_exec_t *) instance;
364 vp = pairfind(request->reply->vps, PW_EXEC_PROGRAM, 0);
368 } else if ((vp = pairfind(request->reply->vps, PW_EXEC_PROGRAM_WAIT, 0)) != NULL) {
372 if (!inst->program) return RLM_MODULE_NOOP;
374 return exec_dispatch(instance, request);
378 result = radius_exec_program(vp->vp_strvalue, request, exec_wait,
379 NULL, 0, request->packet->vps, &tmp,
383 * Always add the value-pairs to the reply.
385 pairmove(&request->reply->vps, &tmp);
390 * Error. radius_exec_program() returns -1 on
393 tmp = pairmake("Reply-Message", "Access denied (external check failed)", T_OP_SET);
394 pairadd(&request->reply->vps, tmp);
396 RDEBUG2("Login incorrect (external check failed)");
398 request->reply->code = PW_AUTHENTICATION_REJECT;
399 return RLM_MODULE_REJECT;
403 * Reject. radius_exec_program() returns >0
404 * if the exec'ed program had a non-zero
407 request->reply->code = PW_AUTHENTICATION_REJECT;
408 RDEBUG2("Login incorrect (external check said so)");
409 return RLM_MODULE_REJECT;
412 return RLM_MODULE_OK;
416 * First, look for Exec-Program && Exec-Program-Wait.
418 * Then, call exec_dispatch.
420 static int exec_accounting(void *instance, REQUEST *request)
425 rlm_exec_t *inst = (rlm_exec_t *) instance;
428 * The "bare" exec module takes care of handling
429 * Exec-Program and Exec-Program-Wait.
431 if (!inst->bare) return exec_dispatch(instance, request);
433 vp = pairfind(request->reply->vps, PW_EXEC_PROGRAM, 0);
437 } else if ((vp = pairfind(request->reply->vps, PW_EXEC_PROGRAM_WAIT, 0)) != NULL) {
440 if (!vp) return RLM_MODULE_NOOP;
442 result = radius_exec_program(vp->vp_strvalue, request, exec_wait,
443 NULL, 0, request->packet->vps, NULL,
446 return RLM_MODULE_REJECT;
449 return RLM_MODULE_OK;
453 * The module name should be the only globally exported symbol.
454 * That is, everything else should be 'static'.
456 * If the module needs to temporarily modify it's instantiation
457 * data, the type should be changed to RLM_TYPE_THREAD_UNSAFE.
458 * The server will then take care of ensuring that the module
459 * is single-threaded.
461 module_t rlm_exec = {
464 RLM_TYPE_CHECK_CONFIG_SAFE, /* type */
465 exec_instantiate, /* instantiation */
466 exec_detach, /* detach */
468 exec_dispatch, /* authentication */
469 exec_dispatch, /* authorization */
470 exec_dispatch, /* pre-accounting */
471 exec_accounting, /* accounting */
472 NULL, /* check simul */
473 exec_dispatch, /* pre-proxy */
474 exec_dispatch, /* post-proxy */
475 exec_postauth /* post-auth */