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 74
- compare with another revision
- download diff
- download tarball
- view history from revision 74
- Committer: Teddy Hogeborn
- Date: 2008-08-14 02:24:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080814022459-rq3jt4q409l3qbj3
* Makefile (PREFIX, CONFDIR): New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
* initramfs-tools-hook: Search for Mandos in /usr/local as well as in
/usr. Also copy plugin-runner. Also chmod
the config dir.
(DESTCONFDIR): Removed.
(MANDOSDIR): New.
(PLUGINDIR): Changed to "${MANDOSDIR}/plugins.d".
* initramfs-tools-script: New.
* mandos-client.c: Renamed to "plugin-runner.c". All references
changed.
(plugindir): Changed to "/lib/mandos/plugins.d".
* plugins.d/usplash: New.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- 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(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
69
const char *argp_program_version = "plugin-runner 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
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*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
94
91
struct plugin *next;
95
92
} plugin;
96
93
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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
if (new_plugin == NULL){
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
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
new_plugin->argv[1] = NULL;
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
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));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
187
132
}
188
133
189
134
/*
202
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
148
}
204
149
150
process *process_list = NULL;
205
151
206
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
207
153
status. */
208
154
void handle_sigchld(__attribute__((unused)) int sig){
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
}
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
236
171
}
237
172
238
/* Prints out a password to stdout */
239
173
bool print_out_password(const char *buffer, size_t length){
240
174
ssize_t ret;
241
175
if(length>0 and buffer[length-1] == '\n'){
251
185
return true;
252
186
}
253
187
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
}
288
}
289
290
188
int main(int argc, char *argv[]){
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
189
const char *plugindir = "/lib/mandos/plugins.d";
294
190
size_t d_name_len;
295
191
DIR *dir = NULL;
296
192
struct dirent *dirst;
304
200
struct sigaction old_sigchld_action;
305
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
306
202
.sa_flags = SA_NOCLDSTOP };
307
char **custom_argv = NULL;
308
int custom_argc = 0;
309
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
310
206
/* Establish a signal handler */
311
207
sigemptyset(&sigchld_action.sa_mask);
312
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
if(ret == -1){
209
if(ret < 0){
314
210
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
211
exit(EXIT_FAILURE);
317
212
}
318
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
if(ret == -1){
214
if(ret < 0){
320
215
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
216
exit(EXIT_FAILURE);
323
217
}
324
218
325
219
/* The options we understand. */
327
221
{ .name = "global-options", .key = 'g',
328
222
.arg = "OPTION[,OPTION[,...]]",
329
223
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
333
224
{ .name = "options-for", .key = 'o',
334
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
226
.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" },
339
227
{ .name = "disable", .key = 'd',
340
228
.arg = "PLUGIN",
341
229
.doc = "Disable a specific plugin", .group = 1 },
342
230
{ .name = "plugin-dir", .key = 128,
343
231
.arg = "DIRECTORY",
344
232
.doc = "Specify a different plugin directory", .group = 2 },
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 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
356
241
{ .name = NULL }
357
242
};
358
243
359
error_t parse_opt (int key, char *arg, __attribute__((unused)) struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
360
245
/* Get the INPUT argument from `argp_parse', which we know is a
361
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
362
248
switch (key) {
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 */
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
456
280
uid = (uid_t)strtol(arg, NULL, 10);
457
281
break;
458
case 131: /* --groupid */
282
case 130:
459
283
gid = (gid_t)strtol(arg, NULL, 10);
460
284
break;
461
case 132: /* --debug */
285
case 131:
462
286
debug = true;
463
287
break;
464
288
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
466
293
break;
467
294
case ARGP_KEY_END:
468
295
break;
472
299
return 0;
473
300
}
474
301
302
plugin *plugin_list = NULL;
303
475
304
struct argp argp = { .options = options, .parser = parse_opt,
476
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
477
306
.doc = "Mandos plugin runner -- Run plugins" };
478
307
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
480
309
if (ret == ARGP_ERR_UNKNOWN){
481
310
fprintf(stderr, "Unknown error while parsing arguments\n");
482
311
exitstatus = EXIT_FAILURE;
483
goto fallback;
312
goto end;
484
313
}
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){
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
503
325
perror("malloc");
504
326
exitstatus = EXIT_FAILURE;
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);
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
558
346
if (ret == ARGP_ERR_UNKNOWN){
559
347
fprintf(stderr, "Unknown error while parsing arguments\n");
560
348
exitstatus = EXIT_FAILURE;
561
goto fallback;
349
goto end;
562
350
}
563
351
}
564
352
569
357
for(char **a = p->argv; *a != NULL; a++){
570
358
fprintf(stderr, "\tArg: %s\n", *a);
571
359
}
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
}
576
360
}
577
361
}
578
579
/* Strip permissions down to nobody */
362
580
363
ret = setuid(uid);
581
364
if (ret == -1){
582
365
perror("setuid");
583
}
366
}
367
584
368
setgid(gid);
585
369
if (ret == -1){
586
370
perror("setgid");
587
371
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
372
373
dir = opendir(plugindir);
595
374
if(dir == NULL){
596
375
perror("Could not open plugin dir");
597
376
exitstatus = EXIT_FAILURE;
598
goto fallback;
377
goto end;
599
378
}
600
379
601
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
606
385
if(ret < 0){
607
386
perror("set_cloexec_flag");
608
387
exitstatus = EXIT_FAILURE;
609
goto fallback;
388
goto end;
610
389
}
611
390
}
612
391
}
613
392
614
393
FD_ZERO(&rfds_all);
615
616
/* Read and execute any executable in the plugin directory*/
394
617
395
while(true){
618
396
dirst = readdir(dir);
619
397
622
400
if (errno == EBADF){
623
401
perror("readdir");
624
402
exitstatus = EXIT_FAILURE;
625
goto fallback;
403
goto end;
626
404
}
627
405
break;
628
406
}
650
428
break;
651
429
}
652
430
}
431
653
432
if(bad_name){
654
433
continue;
655
434
}
435
656
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
437
size_t suf_len = strlen(*suf);
658
438
if((d_name_len >= suf_len)
671
451
continue;
672
452
}
673
453
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
679
458
continue;
680
459
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
681
463
682
464
ret = stat(filename, &st);
683
465
if (ret == -1){
685
467
free(filename);
686
468
continue;
687
469
}
688
689
/* Ignore non-executable files */
470
690
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
691
472
if(debug){
692
473
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
695
476
free(filename);
696
477
continue;
697
478
}
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){
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
706
480
if(debug){
707
481
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
482
dirst->d_name);
710
484
free(filename);
711
485
continue;
712
486
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
713
488
{
714
489
/* Add global arguments to argument list for this plugin */
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];
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
747
496
ret = pipe(pipefd);
748
497
if (ret == -1){
749
498
perror("pipe");
750
499
exitstatus = EXIT_FAILURE;
751
goto fallback;
500
goto end;
752
501
}
753
/* Ask OS to automatic close the pipe on exec */
754
502
ret = set_cloexec_flag(pipefd[0]);
755
503
if(ret < 0){
756
504
perror("set_cloexec_flag");
757
505
exitstatus = EXIT_FAILURE;
758
goto fallback;
506
goto end;
759
507
}
760
508
ret = set_cloexec_flag(pipefd[1]);
761
509
if(ret < 0){
762
510
perror("set_cloexec_flag");
763
511
exitstatus = EXIT_FAILURE;
764
goto fallback;
512
goto end;
765
513
}
766
514
/* Block SIGCHLD until process is safely in process list */
767
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
768
516
if(ret < 0){
769
517
perror("sigprocmask");
770
518
exitstatus = EXIT_FAILURE;
771
goto fallback;
519
goto end;
772
520
}
773
521
// Starting a new process to be watched
774
522
pid_t pid = fork();
775
523
if(pid == -1){
776
524
perror("fork");
777
525
exitstatus = EXIT_FAILURE;
778
goto fallback;
526
goto end;
779
527
}
780
528
if(pid == 0){
781
529
/* this is the child process */
801
549
above and must now close it manually here. */
802
550
closedir(dir);
803
551
}
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
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
814
555
}
815
556
/* no return */
816
557
}
817
/* Parent process */
818
close(pipefd[1]); /* Close unused write end of pipe */
558
/* parent process */
819
559
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
823
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
824
565
if(ret < 0){
825
perror("sigprocmask");
566
perror("sigprocmask");
826
567
}
827
568
exitstatus = EXIT_FAILURE;
828
goto fallback;
569
goto end;
829
570
}
830
571
831
new_plugin->pid = pid;
832
new_plugin->fd = pipefd[0];
833
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
834
577
/* Unblock SIGCHLD so signal handler can be run if this process
835
578
has already completed */
836
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
837
580
if(ret < 0){
838
581
perror("sigprocmask");
839
582
exitstatus = EXIT_FAILURE;
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
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
849
599
}
850
600
851
601
closedir(dir);
852
602
dir = NULL;
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
}
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
863
608
}
864
865
/* Main loop while running plugins exist */
866
while(plugin_list){
609
while(process_list){
867
610
fd_set rfds = rfds_all;
868
611
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
612
if (select_ret == -1){
870
613
perror("select");
871
614
exitstatus = EXIT_FAILURE;
872
goto fallback;
615
goto end;
873
616
}
874
617
/* OK, now either a process completed, or something can be read
875
618
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
619
for(process *proc = process_list; proc ; proc = proc->next){
877
620
/* Is this process completely done? */
878
621
if(proc->eof and proc->completed){
879
622
/* Only accept the plugin output if it exited cleanly */
880
623
if(not WIFEXITED(proc->status)
881
624
or WEXITSTATUS(proc->status) != 0){
882
625
/* Bad exit by plugin */
883
884
626
if(debug){
885
627
if(WIFEXITED(proc->status)){
886
628
fprintf(stderr, "Plugin %u exited with status %d\n",
895
637
(unsigned int) (proc->pid));
896
638
}
897
639
}
898
899
640
/* Remove the plugin */
900
641
FD_CLR(proc->fd, &rfds_all);
901
902
642
/* Block signal while modifying process_list */
903
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
904
644
if(ret < 0){
905
645
perror("sigprocmask");
906
646
exitstatus = EXIT_FAILURE;
907
goto fallback;
908
}
909
free_plugin(proc);
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
910
662
/* We are done modifying process list, so unblock signal */
911
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
664
NULL);
913
665
if(ret < 0){
914
666
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
916
goto fallback;
917
}
918
919
if(plugin_list == NULL){
920
break;
921
}
922
continue;
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
923
674
}
924
925
675
/* This process exited nicely, so print its buffer */
926
676
927
bool bret = print_out_password(proc->buffer,
928
proc->buffer_length);
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
929
678
if(not bret){
930
679
perror("print_out_password");
931
680
exitstatus = EXIT_FAILURE;
932
681
}
933
goto fallback;
682
goto end;
934
683
}
935
936
684
/* This process has not completed. Does it have any output? */
937
685
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
686
/* This process had nothing to say at this time */
945
693
if (proc->buffer == NULL){
946
694
perror("malloc");
947
695
exitstatus = EXIT_FAILURE;
948
goto fallback;
696
goto end;
949
697
}
950
698
proc->buffer_size += BUFFER_SIZE;
951
699
}
966
714
}
967
715
968
716
969
fallback:
717
end:
970
718
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
972
/* Fallback if all plugins failed, none are found or an error
973
occured */
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
974
721
bool bret;
975
722
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
723
char *passwordbuffer = getpass("Password: ");
978
725
if(not bret){
979
726
perror("print_out_password");
980
727
exitstatus = EXIT_FAILURE;
728
goto end;
981
729
}
982
730
}
983
731
984
732
/* Restore old signal handler */
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);
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
996
742
}
997
743
998
744
if(dir != NULL){
1000
746
}
1001
747
1002
748
/* Free the process list and kill the processes */
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
}
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1011
756
}
757
free(process_list->buffer);
758
free(process_list);
1012
759
}
1013
760
1014
761
/* Wait for any remaining child processes to terminate */
1018
765
if(errno != ECHILD){
1019
766
perror("wait");
1020
767
}
1021
1022
free_plugin_list();
1023
1024
free(plugindir);
1025
free(argfile);
1026
768
1027
769
return exitstatus;
1028
770
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0