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- Committer: Teddy Hogeborn
- Date: 2008-01-18 22:04:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20080118220419-z95418owrporioo5
* Makefile (client_debug): New.
* client.cpp (CERT_ROOT): New.
(Tested)
* client.cpp (CERT_ROOT): New.
(Tested)
- files added:
- client.cpp
- files removed:
- plugbasedclient.c
- plugins.d
- files modified:
- Makefile
added
removed
plugbasedclient.c
1
/* -*- coding: utf-8 -*- */
2
/*
3
* Mandos plugin runner - Run Mandos plugins
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn and Björn Påhlsson.
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* General Public License for more details.
16
*
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* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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* <https://www.fukt.bsnet.se/~teddy/>.
23
*/
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25
#define _FORTIFY_SOURCE 2
26
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
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WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
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#include <unistd.h> /* stat, struct stat, chdir */
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#include <stdlib.h> /* EXIT_FAILURE */
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#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
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FD_ISSET */
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#include <string.h> /* strlen, strcpy, strcat */
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#include <stdbool.h> /* true */
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#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
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#include <errno.h> /* errno */
42
#include <argp.h> /* argp */
43
44
struct process;
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46
typedef struct process{
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pid_t pid;
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int fd;
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char *buffer;
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size_t buffer_size;
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size_t buffer_length;
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struct process *next;
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} process;
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typedef struct plugin{
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char *name; /* can be "global" and any plugin name */
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char **argv;
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int argc;
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bool disable;
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struct plugin *next;
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} plugin;
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plugin *getplugin(char *name, plugin **plugin_list){
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for (plugin *p = *plugin_list; p != NULL; p = p->next){
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if ((p->name == name)
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or (p->name and name and (strcmp(p->name, name) == 0))){
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return p;
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}
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}
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/* Create a new plugin */
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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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new_plugin->name = name;
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new_plugin->argv = malloc(sizeof(char *) * 2);
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if (new_plugin->argv == NULL){
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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new_plugin->argv[0] = name;
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new_plugin->argv[1] = NULL;
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new_plugin->argc = 1;
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new_plugin->disable = false;
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new_plugin->next = *plugin_list;
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/* Append the new plugin to the list */
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*plugin_list = new_plugin;
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return new_plugin;
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}
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void addarguments(plugin *p, char *arg){
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p->argv[p->argc] = arg;
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p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
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if (p->argv == NULL){
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perror("malloc");
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exit(EXIT_FAILURE);
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}
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p->argc++;
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p->argv[p->argc] = NULL;
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}
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#define BUFFER_SIZE 256
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const char *argp_program_version =
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"plugbasedclient 0.9";
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const char *argp_program_bug_address =
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"<mandos@fukt.bsnet.se>";
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static char doc[] =
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"Mandos plugin runner -- Run Mandos plugins";
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/* A description of the arguments we accept. */
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static char args_doc[] = "";
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int main(int argc, char *argv[]){
115
const char *plugindir = "plugins.d";
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size_t d_name_len;
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DIR *dir;
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struct dirent *dirst;
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struct stat st;
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fd_set rfds_orig;
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int ret, maxfd = 0;
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process *process_list = NULL;
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uid_t uid = 65534;
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gid_t gid = 65534;
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/* The options we understand. */
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struct argp_option options[] = {
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{ .name = "global-options", .key = 'g',
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.arg = "option[,option[,...]]", .flags = 0,
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.doc = "Options effecting all plugins" },
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{ .name = "options-for", .key = 'o',
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.arg = "plugin:option[,option[,...]]", .flags = 0,
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.doc = "Options effecting only specified plugins" },
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{ .name = "disable-plugin", .key = 'd',
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.arg = "Plugin[,Plugin[,...]]", .flags = 0,
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.doc = "Option to disable specififed plugins" },
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{ .name = "plugin-dir", .key = 128,
137
.arg = "Directory", .flags = 0,
138
.doc = "Option to change directory to search for plugins" },
139
{ .name = "userid", .key = 129,
140
.arg = "Id", .flags = 0,
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.doc = "Option to change which user id the plugins will run as" },
142
{ .name = "groupid", .key = 130,
143
.arg = "Id", .flags = 0,
144
.doc = "Option to change which group id the plugins will run as" },
145
{ .name = NULL }
146
};
147
148
error_t parse_opt (int key, char *arg, struct argp_state *state) {
149
/* Get the INPUT argument from `argp_parse', which we
150
know is a pointer to our arguments structure. */
151
plugin **plugins = state->input;
152
switch (key) {
153
case 'g':
154
if (arg != NULL){
155
char *p = strtok(arg, ",");
156
do{
157
addarguments(getplugin(NULL, plugins), p);
158
p = strtok(NULL, ",");
159
} while (p);
160
}
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break;
162
case 'o':
163
if (arg != NULL){
164
char *name = strtok(arg, ":");
165
char *p = strtok(NULL, ":");
166
p = strtok(p, ",");
167
do{
168
addarguments(getplugin(name, plugins), p);
169
p = strtok(NULL, ",");
170
} while (p);
171
}
172
break;
173
case 'd':
174
if (arg != NULL){
175
char *p = strtok(arg, ",");
176
do{
177
getplugin(p, plugins)->disable = true;
178
p = strtok(NULL, ",");
179
} while (p);
180
}
181
break;
182
case 128:
183
plugindir = arg;
184
break;
185
case 129:
186
uid = (uid_t)strtol(arg, NULL, 10);
187
break;
188
case 130:
189
gid = (gid_t)strtol(arg, NULL, 10);
190
break;
191
case ARGP_KEY_ARG:
192
argp_usage (state);
193
break;
194
case ARGP_KEY_END:
195
break;
196
default:
197
return ARGP_ERR_UNKNOWN;
198
}
199
return 0;
200
}
201
202
plugin *plugin_list = NULL;
203
204
struct argp argp = { .options = options, .parser = parse_opt,
205
.args_doc = args_doc, .doc = doc };
206
207
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
208
209
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
210
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
211
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
212
/* fprintf(stderr, "\tArg: %s\n", *a); */
213
/* } */
214
/* } */
215
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/* return 0; */
217
218
ret = setuid(uid);
219
if (ret == -1){
220
perror("setuid");
221
}
222
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setgid(gid);
224
if (ret == -1){
225
perror("setuid");
226
}
227
228
dir = opendir(plugindir);
229
230
if(dir == NULL){
231
fprintf(stderr, "Can not open directory\n");
232
return EXIT_FAILURE;
233
}
234
235
FD_ZERO(&rfds_orig);
236
237
while(true){
238
dirst = readdir(dir);
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240
// All directory entries have been processed
241
if(dirst == NULL){
242
break;
243
}
244
245
d_name_len = strlen(dirst->d_name);
246
247
// Ignore dotfiles and backup files
248
if (dirst->d_name[0] == '.'
249
or dirst->d_name[d_name_len - 1] == '~'){
250
continue;
251
}
252
253
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
254
strcpy(filename, plugindir);
255
strcat(filename, "/");
256
strcat(filename, dirst->d_name);
257
258
stat(filename, &st);
259
260
if (S_ISREG(st.st_mode)
261
and (access(filename, X_OK) == 0)
262
and not (getplugin(dirst->d_name, &plugin_list)->disable)){
263
// Starting a new process to be watched
264
process *new_process = malloc(sizeof(process));
265
int pipefd[2];
266
ret = pipe(pipefd);
267
if (ret == -1){
268
perror(argv[0]);
269
goto end;
270
}
271
new_process->pid = fork();
272
if(new_process->pid == 0){
273
/* this is the child process */
274
closedir(dir);
275
close(pipefd[0]); /* close unused read end of pipe */
276
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
277
278
plugin *p = getplugin(dirst->d_name, &plugin_list);
279
plugin *g = getplugin(NULL, &plugin_list);
280
for(char **a = g->argv + 1; *a != NULL; a++){
281
addarguments(p, *a);
282
}
283
if(execv(filename, p->argv) < 0){
284
perror(argv[0]);
285
close(pipefd[1]);
286
exit(EXIT_FAILURE);
287
}
288
/* no return */
289
}
290
close(pipefd[1]); /* close unused write end of pipe */
291
new_process->fd = pipefd[0];
292
new_process->buffer = malloc(BUFFER_SIZE);
293
if (new_process->buffer == NULL){
294
perror(argv[0]);
295
goto end;
296
}
297
new_process->buffer_size = BUFFER_SIZE;
298
new_process->buffer_length = 0;
299
FD_SET(new_process->fd, &rfds_orig);
300
301
if (maxfd < new_process->fd){
302
maxfd = new_process->fd;
303
}
304
305
//List handling
306
new_process->next = process_list;
307
process_list = new_process;
308
}
309
}
310
311
closedir(dir);
312
313
if (process_list != NULL){
314
while(true){
315
fd_set rfds = rfds_orig;
316
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
317
if (select_ret == -1){
318
perror(argv[0]);
319
goto end;
320
}else{
321
for(process *process_itr = process_list; process_itr != NULL;
322
process_itr = process_itr->next){
323
if(FD_ISSET(process_itr->fd, &rfds)){
324
if(process_itr->buffer_length + BUFFER_SIZE
325
> process_itr->buffer_size){
326
process_itr->buffer = realloc(process_itr->buffer,
327
process_itr->buffer_size
328
+ (size_t) BUFFER_SIZE);
329
if (process_itr->buffer == NULL){
330
perror(argv[0]);
331
goto end;
332
}
333
process_itr->buffer_size += BUFFER_SIZE;
334
}
335
ret = read(process_itr->fd, process_itr->buffer
336
+ process_itr->buffer_length, BUFFER_SIZE);
337
if(ret < 0){
338
/* Read error from this process; ignore it */
339
continue;
340
}
341
process_itr->buffer_length += (size_t) ret;
342
if(ret == 0){
343
/* got EOF */
344
/* wait for process exit */
345
int status;
346
waitpid(process_itr->pid, &status, 0);
347
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
348
for(size_t written = 0;
349
written < process_itr->buffer_length;){
350
ret = write(STDOUT_FILENO,
351
process_itr->buffer + written,
352
process_itr->buffer_length - written);
353
if(ret < 0){
354
perror(argv[0]);
355
goto end;
356
}
357
written += (size_t)ret;
358
}
359
goto end;
360
} else {
361
FD_CLR(process_itr->fd, &rfds_orig);
362
}
363
}
364
}
365
}
366
}
367
}
368
}
369
370
end:
371
for(process *process_itr = process_list; process_itr != NULL;
372
process_itr = process_itr->next){
373
close(process_itr->fd);
374
kill(process_itr->pid, SIGTERM);
375
free(process_itr->buffer);
376
}
377
378
while(true){
379
int status;
380
ret = wait(&status);
381
if (ret == -1){
382
if(errno != ECHILD){
383
perror("wait");
384
}
385
break;
386
}
387
}
388
return EXIT_SUCCESS;
389
}
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