To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 132
- compare with another revision
- download diff
- download tarball
- view history from revision 132
- Committer: Teddy Hogeborn
- Date: 2008-08-31 16:04:47 UTC
- mfrom: (24.1.77 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080831160447-2xte5k90onspphki
Merge.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
52
66
53
67
#define BUFFER_SIZE 256
54
68
55
struct process;
56
57
typedef struct process{
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
58
86
pid_t pid;
59
87
int fd;
60
88
char *buffer;
61
89
size_t buffer_size;
62
90
size_t buffer_length;
63
91
bool eof;
64
bool completed;
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
92
volatile bool completed;
93
volatile int status;
74
94
struct plugin *next;
75
95
} plugin;
76
96
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
79
104
if ((p->name == name)
80
105
or (p->name and name and (strcmp(p->name, name) == 0))){
81
106
return p;
84
109
/* Create a new plugin */
85
110
plugin *new_plugin = malloc(sizeof(plugin));
86
111
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
91
127
new_plugin->argv = malloc(sizeof(char *) * 2);
92
128
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
95
132
}
96
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
97
134
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
101
145
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
103
147
return new_plugin;
104
148
}
105
149
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
183
if(p == NULL){
184
return false;
185
}
186
return add_to_char_array(def, &(p->environ), &(p->envc));
115
187
}
116
188
117
189
/*
130
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
203
}
132
204
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
205
206
/* Mark processes as completed when they exit, and save their exit
139
207
status. */
140
208
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
209
while(true){
210
plugin *proc = plugin_list;
211
int status;
212
pid_t pid = waitpid(-1, &status, WNOHANG);
213
if(pid == 0){
214
/* Only still running child processes */
215
break;
216
}
217
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
220
}
221
/* No child processes */
222
break;
223
}
224
225
/* A child exited, find it in process_list */
226
while(proc != NULL and proc->pid != pid){
227
proc = proc->next;
228
}
229
if(proc == NULL){
230
/* Process not found in process list */
231
continue;
232
}
233
proc->status = status;
234
proc->completed = true;
235
}
236
}
237
238
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
for(size_t written = 0; written < length; written += (size_t)ret){
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
length - written));
247
if(ret < 0){
248
return false;
249
}
250
}
251
return true;
252
}
253
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
287
}
153
288
}
154
289
155
290
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
157
294
size_t d_name_len;
158
295
DIR *dir = NULL;
159
296
struct dirent *dirst;
167
304
struct sigaction old_sigchld_action;
168
305
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
306
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
307
char **custom_argv = NULL;
308
int custom_argc = 0;
172
309
173
310
/* Establish a signal handler */
174
311
sigemptyset(&sigchld_action.sa_mask);
175
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
313
if(ret == -1){
177
314
perror("sigaddset");
178
exit(EXIT_FAILURE);
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
179
317
}
180
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
319
if(ret == -1){
182
320
perror("sigaction");
183
exit(EXIT_FAILURE);
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
184
323
}
185
324
186
325
/* The options we understand. */
188
327
{ .name = "global-options", .key = 'g',
189
328
.arg = "OPTION[,OPTION[,...]]",
190
329
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
191
333
{ .name = "options-for", .key = 'o',
192
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
335
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
337
.arg = "PLUGIN:ENV=value",
338
.doc = "Environment variable passed to specified plugin" },
194
339
{ .name = "disable", .key = 'd',
195
340
.arg = "PLUGIN",
196
341
.doc = "Disable a specific plugin", .group = 1 },
197
342
{ .name = "plugin-dir", .key = 128,
198
343
.arg = "DIRECTORY",
199
344
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
345
{ .name = "config-file", .key = 129,
346
.arg = "FILE",
347
.doc = "Specify a different configuration file", .group = 2 },
348
{ .name = "userid", .key = 130,
349
.arg = "ID", .flags = 0,
350
.doc = "User ID the plugins will run as", .group = 3 },
351
{ .name = "groupid", .key = 131,
352
.arg = "ID", .flags = 0,
353
.doc = "Group ID the plugins will run as", .group = 3 },
354
{ .name = "debug", .key = 132,
355
.doc = "Debug mode", .group = 4 },
208
356
{ .name = NULL }
209
357
};
210
358
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
212
360
/* Get the INPUT argument from `argp_parse', which we know is a
213
361
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
215
362
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
363
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
389
}
390
break;
391
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
411
}
412
}
413
}
414
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
419
{
420
char *envdef = strchr(arg, ':');
421
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
428
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
perror("add_environment");
431
}
432
}
433
break;
434
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
p->disabled = true;
441
}
442
break;
443
case 128: /* --plugin-dir */
444
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
case 129: /* --config-file */
450
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
453
}
454
break;
455
case 130: /* --userid */
247
456
uid = (uid_t)strtol(arg, NULL, 10);
248
457
break;
249
case 130:
458
case 131: /* --groupid */
250
459
gid = (gid_t)strtol(arg, NULL, 10);
251
460
break;
252
case 131:
461
case 132: /* --debug */
253
462
debug = true;
254
463
break;
255
464
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
258
}
259
plus_options = arg;
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
260
466
break;
261
467
case ARGP_KEY_END:
262
468
break;
266
472
return 0;
267
473
}
268
474
269
plugin *plugin_list = NULL;
270
271
475
struct argp argp = { .options = options, .parser = parse_opt,
272
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
273
477
.doc = "Mandos plugin runner -- Run plugins" };
274
478
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
485
486
/* Opens the configfile if aviable */
487
if (argfile == NULL){
488
conffp = fopen(AFILE, "r");
489
} else {
490
conffp = fopen(argfile, "r");
491
}
492
if(conffp != NULL){
493
char *org_line = NULL;
494
char *p, *arg, *new_arg, *line;
495
size_t size = 0;
496
ssize_t sret;
497
const char whitespace_delims[] = " \r\t\f\v\n";
498
const char comment_delim[] = "#";
499
500
custom_argc = 1;
501
custom_argv = malloc(sizeof(char*) * 2);
502
if(custom_argv == NULL){
287
503
perror("malloc");
288
504
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
505
goto fallback;
506
}
507
custom_argv[0] = argv[0];
508
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
511
while(true){
512
sret = getline(&org_line, &size, conffp);
513
if(sret == -1){
514
break;
515
}
516
517
line = org_line;
518
arg = strsep(&line, comment_delim);
519
while((p = strsep(&arg, whitespace_delims)) != NULL){
520
if(p[0] == '\0'){
521
continue;
522
}
523
new_arg = strdup(p);
524
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
527
free(org_line);
528
goto fallback;
529
}
530
531
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
goto fallback;
539
}
540
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
542
}
543
}
544
free(org_line);
545
} else{
546
/* Check for harmful errors and go to fallback. Other errors might
547
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
551
goto fallback;
552
}
553
}
554
/* If there was any arguments from configuration file,
555
pass them to parser as command arguments */
556
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
goto fallback;
562
}
308
563
}
309
564
310
565
if(debug){
314
569
for(char **a = p->argv; *a != NULL; a++){
315
570
fprintf(stderr, "\tArg: %s\n", *a);
316
571
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
573
for(char **a = p->environ; *a != NULL; a++){
574
fprintf(stderr, "\t%s\n", *a);
575
}
317
576
}
318
577
}
319
578
579
/* Strip permissions down to nobody */
320
580
ret = setuid(uid);
321
581
if (ret == -1){
322
582
perror("setuid");
323
}
324
583
}
325
584
setgid(gid);
326
585
if (ret == -1){
327
586
perror("setgid");
328
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
329
594
330
dir = opendir(plugindir);
331
595
if(dir == NULL){
332
596
perror("Could not open plugin dir");
333
597
exitstatus = EXIT_FAILURE;
334
goto end;
598
goto fallback;
335
599
}
336
600
337
601
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
606
if(ret < 0){
343
607
perror("set_cloexec_flag");
344
608
exitstatus = EXIT_FAILURE;
345
goto end;
609
goto fallback;
346
610
}
347
611
}
348
612
}
349
613
350
614
FD_ZERO(&rfds_all);
351
615
616
/* Read and execute any executable in the plugin directory*/
352
617
while(true){
353
618
dirst = readdir(dir);
354
619
355
620
// All directory entries have been processed
356
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
357
627
break;
358
628
}
359
629
380
650
break;
381
651
}
382
652
}
383
384
653
if(bad_name){
385
654
continue;
386
655
}
387
388
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
657
size_t suf_len = strlen(*suf);
390
658
if((d_name_len >= suf_len)
403
671
continue;
404
672
}
405
673
}
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
689
/* Ignore non-executable files */
419
690
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
691
if(debug){
421
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
424
695
free(filename);
425
696
continue;
426
697
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
698
699
plugin *p = getplugin(dirst->d_name);
700
if(p == NULL){
701
perror("getplugin");
702
free(filename);
703
continue;
704
}
705
if(p->disabled){
428
706
if(debug){
429
707
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
708
dirst->d_name);
432
710
free(filename);
433
711
continue;
434
712
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
713
{
437
714
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
715
plugin *g = getplugin(NULL);
716
if(g != NULL){
717
for(char **a = g->argv + 1; *a != NULL; a++){
718
if(not add_argument(p, *a)){
719
perror("add_argument");
720
}
721
}
722
/* Add global environment variables */
723
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
726
}
727
}
728
}
729
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
733
if(p->environ[0] != NULL){
734
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
742
}
743
}
744
}
745
746
int pipefd[2];
444
747
ret = pipe(pipefd);
445
748
if (ret == -1){
446
749
perror("pipe");
447
750
exitstatus = EXIT_FAILURE;
448
goto end;
751
goto fallback;
449
752
}
753
/* Ask OS to automatic close the pipe on exec */
450
754
ret = set_cloexec_flag(pipefd[0]);
451
755
if(ret < 0){
452
756
perror("set_cloexec_flag");
453
757
exitstatus = EXIT_FAILURE;
454
goto end;
758
goto fallback;
455
759
}
456
760
ret = set_cloexec_flag(pipefd[1]);
457
761
if(ret < 0){
458
762
perror("set_cloexec_flag");
459
763
exitstatus = EXIT_FAILURE;
460
goto end;
764
goto fallback;
461
765
}
462
766
/* Block SIGCHLD until process is safely in process list */
463
767
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
768
if(ret < 0){
465
769
perror("sigprocmask");
466
770
exitstatus = EXIT_FAILURE;
467
goto end;
771
goto fallback;
468
772
}
469
773
// Starting a new process to be watched
470
774
pid_t pid = fork();
775
if(pid == -1){
776
perror("fork");
777
exitstatus = EXIT_FAILURE;
778
goto fallback;
779
}
471
780
if(pid == 0){
472
781
/* this is the child process */
473
782
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
480
789
perror("sigprocmask");
481
790
_exit(EXIT_FAILURE);
482
791
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
792
793
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
797
}
484
798
485
799
if(dirfd(dir) < 0){
486
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
801
above and must now close it manually here. */
488
802
closedir(dir);
489
803
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
493
814
}
494
815
/* no return */
495
816
}
496
/* parent process */
817
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
497
819
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
502
823
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
824
if(ret < 0){
504
perror("sigprocmask");
825
perror("sigprocmask");
505
826
}
506
827
exitstatus = EXIT_FAILURE;
507
goto end;
828
goto fallback;
508
829
}
509
830
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
831
new_plugin->pid = pid;
832
new_plugin->fd = pipefd[0];
833
515
834
/* Unblock SIGCHLD so signal handler can be run if this process
516
835
has already completed */
517
836
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
837
if(ret < 0){
519
838
perror("sigprocmask");
520
839
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
840
goto fallback;
841
}
842
843
FD_SET(new_plugin->fd, &rfds_all);
844
845
if (maxfd < new_plugin->fd){
846
maxfd = new_plugin->fd;
847
}
848
537
849
}
538
850
539
851
closedir(dir);
540
852
dir = NULL;
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
853
854
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
if(p->pid != 0){
856
break;
857
}
858
if(p->next == NULL){
859
fprintf(stderr, "No plugin processes started. Incorrect plugin"
860
" directory?\n");
861
free_plugin_list();
862
}
546
863
}
547
while(process_list){
864
865
/* Main loop while running plugins exist */
866
while(plugin_list){
548
867
fd_set rfds = rfds_all;
549
868
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
869
if (select_ret == -1){
551
870
perror("select");
552
871
exitstatus = EXIT_FAILURE;
553
goto end;
872
goto fallback;
554
873
}
555
874
/* OK, now either a process completed, or something can be read
556
875
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
558
877
/* Is this process completely done? */
559
878
if(proc->eof and proc->completed){
560
879
/* Only accept the plugin output if it exited cleanly */
561
880
if(not WIFEXITED(proc->status)
562
881
or WEXITSTATUS(proc->status) != 0){
563
882
/* Bad exit by plugin */
883
564
884
if(debug){
565
885
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
888
WEXITSTATUS(proc->status));
568
889
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
571
893
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(unsigned int) (proc->pid));
573
896
}
574
897
}
898
575
899
/* Remove the plugin */
576
900
FD_CLR(proc->fd, &rfds_all);
901
577
902
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
904
if(ret < 0){
580
905
perror("sigprocmask");
581
906
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
907
goto fallback;
908
}
909
free_plugin(proc);
597
910
/* We are done modifying process list, so unblock signal */
598
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
912
NULL);
600
913
if(ret < 0){
601
914
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
915
exitstatus = EXIT_FAILURE;
916
goto fallback;
917
}
918
919
if(plugin_list == NULL){
920
break;
921
}
922
continue;
609
923
}
924
610
925
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
926
927
bool bret = print_out_password(proc->buffer,
928
proc->buffer_length);
929
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
622
932
}
623
goto end;
933
goto fallback;
624
934
}
935
625
936
/* This process has not completed. Does it have any output? */
626
937
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
938
/* This process had nothing to say at this time */
634
945
if (proc->buffer == NULL){
635
946
perror("malloc");
636
947
exitstatus = EXIT_FAILURE;
637
goto end;
948
goto fallback;
638
949
}
639
950
proc->buffer_size += BUFFER_SIZE;
640
951
}
653
964
}
654
965
}
655
966
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
967
968
969
fallback:
970
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
972
/* Fallback if all plugins failed, none are found or an error
973
occured */
974
bool bret;
975
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
char *passwordbuffer = getpass("Password: ");
977
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
978
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
981
}
659
982
}
660
983
661
end:
662
984
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
985
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
989
}
990
991
if(custom_argv != NULL){
992
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
free(*arg);
994
}
995
free(custom_argv);
672
996
}
673
997
674
998
if(dir != NULL){
676
1000
}
677
1001
678
1002
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1003
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
if(p->pid != 0){
1005
close(p->fd);
1006
ret = kill(p->pid, SIGTERM);
1007
if(ret == -1 and errno != ESRCH){
1008
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1010
}
1011
}
685
1012
}
686
1013
687
1014
/* Wait for any remaining child processes to terminate */
691
1018
if(errno != ECHILD){
692
1019
perror("wait");
693
1020
}
1021
1022
free_plugin_list();
1023
1024
free(plugindir);
1025
free(argfile);
694
1026
695
1027
return exitstatus;
696
1028
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0