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- Committer: Teddy Hogeborn
- Date: 2008-09-01 08:29:23 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901082923-i2liq6t7warmu9xe
* mandos.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- 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
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
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> /* strtok, strlen(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
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
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
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*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
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;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
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){
96
104
if ((p->name == name)
97
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
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
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
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
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
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;
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));
132
187
}
133
188
134
189
/*
147
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
203
}
149
204
150
process *process_list = NULL;
151
205
152
/* Mark a process as completed when it exits, and save its exit
206
/* Mark processes as completed when they exit, and save their exit
153
207
status. */
154
208
void handle_sigchld(__attribute__((unused)) int sig){
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;
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
}
171
236
}
172
237
238
/* Prints out a password to stdout */
173
239
bool print_out_password(const char *buffer, size_t length){
174
240
ssize_t ret;
175
241
if(length>0 and buffer[length-1] == '\n'){
185
251
return true;
186
252
}
187
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
}
288
}
289
188
290
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
190
294
size_t d_name_len;
191
295
DIR *dir = NULL;
192
296
struct dirent *dirst;
200
304
struct sigaction old_sigchld_action;
201
305
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
306
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
307
char **custom_argv = NULL;
308
int custom_argc = 0;
309
206
310
/* Establish a signal handler */
207
311
sigemptyset(&sigchld_action.sa_mask);
208
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
313
if(ret == -1){
210
314
perror("sigaddset");
211
exit(EXIT_FAILURE);
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
212
317
}
213
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
319
if(ret == -1){
215
320
perror("sigaction");
216
exit(EXIT_FAILURE);
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
217
323
}
218
324
219
325
/* The options we understand. */
221
327
{ .name = "global-options", .key = 'g',
222
328
.arg = "OPTION[,OPTION[,...]]",
223
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" },
224
333
{ .name = "options-for", .key = 'o',
225
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
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" },
227
339
{ .name = "disable", .key = 'd',
228
340
.arg = "PLUGIN",
229
341
.doc = "Disable a specific plugin", .group = 1 },
230
342
{ .name = "plugin-dir", .key = 128,
231
343
.arg = "DIRECTORY",
232
344
.doc = "Specify a different plugin directory", .group = 2 },
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 },
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 },
241
356
{ .name = NULL }
242
357
};
243
358
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
245
361
/* Get the INPUT argument from `argp_parse', which we know is a
246
362
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
363
switch (key) {
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:
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
390
}
391
break;
392
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
412
}
413
}
414
}
415
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
420
{
421
char *envdef = strchr(arg, ':');
422
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
429
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 128: /* --plugin-dir */
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
case 129: /* --config-file */
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
456
case 130: /* --userid */
280
457
uid = (uid_t)strtol(arg, NULL, 10);
281
458
break;
282
case 130:
459
case 131: /* --groupid */
283
460
gid = (gid_t)strtol(arg, NULL, 10);
284
461
break;
285
case 131:
462
case 132: /* --debug */
286
463
debug = true;
287
464
break;
288
465
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
293
467
break;
294
468
case ARGP_KEY_END:
295
469
break;
299
473
return 0;
300
474
}
301
475
302
plugin *plugin_list = NULL;
303
304
476
struct argp argp = { .options = options, .parser = parse_opt,
305
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
306
478
.doc = "Mandos plugin runner -- Run plugins" };
307
479
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
309
481
if (ret == ARGP_ERR_UNKNOWN){
310
482
fprintf(stderr, "Unknown error while parsing arguments\n");
311
483
exitstatus = EXIT_FAILURE;
312
goto end;
484
goto fallback;
313
485
}
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){
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
493
if(conffp != NULL){
494
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
496
size_t size = 0;
497
ssize_t sret;
498
const char whitespace_delims[] = " \r\t\f\v\n";
499
const char comment_delim[] = "#";
500
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
325
504
perror("malloc");
326
505
exitstatus = EXIT_FAILURE;
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);
506
goto fallback;
507
}
508
custom_argv[0] = argv[0];
509
custom_argv[1] = NULL;
510
511
/* for each line in the config file, strip whitespace and ignore
512
commented text */
513
while(true){
514
sret = getline(&org_line, &size, conffp);
515
if(sret == -1){
516
break;
517
}
518
519
line = org_line;
520
arg = strsep(&line, comment_delim);
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
if(p[0] == '\0'){
523
continue;
524
}
525
new_arg = strdup(p);
526
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
529
free(org_line);
530
goto fallback;
531
}
532
533
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
544
}
545
}
546
free(org_line);
547
} else{
548
/* Check for harmful errors and go to fallback. Other errors might
549
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
553
goto fallback;
554
}
555
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
558
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
346
560
if (ret == ARGP_ERR_UNKNOWN){
347
561
fprintf(stderr, "Unknown error while parsing arguments\n");
348
562
exitstatus = EXIT_FAILURE;
349
goto end;
563
goto fallback;
350
564
}
351
565
}
352
566
357
571
for(char **a = p->argv; *a != NULL; a++){
358
572
fprintf(stderr, "\tArg: %s\n", *a);
359
573
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
575
for(char **a = p->environ; *a != NULL; a++){
576
fprintf(stderr, "\t%s\n", *a);
577
}
360
578
}
361
579
}
362
580
581
/* Strip permissions down to nobody */
363
582
ret = setuid(uid);
364
583
if (ret == -1){
365
584
perror("setuid");
366
}
367
585
}
368
586
setgid(gid);
369
587
if (ret == -1){
370
588
perror("setgid");
371
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
372
596
373
dir = opendir(plugindir);
374
597
if(dir == NULL){
375
598
perror("Could not open plugin dir");
376
599
exitstatus = EXIT_FAILURE;
377
goto end;
600
goto fallback;
378
601
}
379
602
380
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
608
if(ret < 0){
386
609
perror("set_cloexec_flag");
387
610
exitstatus = EXIT_FAILURE;
388
goto end;
611
goto fallback;
389
612
}
390
613
}
391
614
}
392
615
393
616
FD_ZERO(&rfds_all);
394
617
618
/* Read and execute any executable in the plugin directory*/
395
619
while(true){
396
620
dirst = readdir(dir);
397
621
400
624
if (errno == EBADF){
401
625
perror("readdir");
402
626
exitstatus = EXIT_FAILURE;
403
goto end;
627
goto fallback;
404
628
}
405
629
break;
406
630
}
428
652
break;
429
653
}
430
654
}
431
432
655
if(bad_name){
433
656
continue;
434
657
}
435
436
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
659
size_t suf_len = strlen(*suf);
438
660
if((d_name_len >= suf_len)
451
673
continue;
452
674
}
453
675
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
458
681
continue;
459
682
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
683
464
684
ret = stat(filename, &st);
465
685
if (ret == -1){
467
687
free(filename);
468
688
continue;
469
689
}
470
690
691
/* Ignore non-executable files */
471
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
693
if(debug){
473
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
476
697
free(filename);
477
698
continue;
478
699
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
700
701
plugin *p = getplugin(dirst->d_name);
702
if(p == NULL){
703
perror("getplugin");
704
free(filename);
705
continue;
706
}
707
if(p->disabled){
480
708
if(debug){
481
709
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
710
dirst->d_name);
484
712
free(filename);
485
713
continue;
486
714
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
715
{
489
716
/* Add global arguments to argument list for this plugin */
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];
717
plugin *g = getplugin(NULL);
718
if(g != NULL){
719
for(char **a = g->argv + 1; *a != NULL; a++){
720
if(not add_argument(p, *a)){
721
perror("add_argument");
722
}
723
}
724
/* Add global environment variables */
725
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
728
}
729
}
730
}
731
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
735
if(p->environ[0] != NULL){
736
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
744
}
745
}
746
}
747
748
int pipefd[2];
496
749
ret = pipe(pipefd);
497
750
if (ret == -1){
498
751
perror("pipe");
499
752
exitstatus = EXIT_FAILURE;
500
goto end;
753
goto fallback;
501
754
}
755
/* Ask OS to automatic close the pipe on exec */
502
756
ret = set_cloexec_flag(pipefd[0]);
503
757
if(ret < 0){
504
758
perror("set_cloexec_flag");
505
759
exitstatus = EXIT_FAILURE;
506
goto end;
760
goto fallback;
507
761
}
508
762
ret = set_cloexec_flag(pipefd[1]);
509
763
if(ret < 0){
510
764
perror("set_cloexec_flag");
511
765
exitstatus = EXIT_FAILURE;
512
goto end;
766
goto fallback;
513
767
}
514
768
/* Block SIGCHLD until process is safely in process list */
515
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
770
if(ret < 0){
517
771
perror("sigprocmask");
518
772
exitstatus = EXIT_FAILURE;
519
goto end;
773
goto fallback;
520
774
}
521
775
// Starting a new process to be watched
522
776
pid_t pid = fork();
523
777
if(pid == -1){
524
778
perror("fork");
525
779
exitstatus = EXIT_FAILURE;
526
goto end;
780
goto fallback;
527
781
}
528
782
if(pid == 0){
529
783
/* this is the child process */
549
803
above and must now close it manually here. */
550
804
closedir(dir);
551
805
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
555
816
}
556
817
/* no return */
557
818
}
558
/* parent process */
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
559
821
free(filename);
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");
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
564
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
826
if(ret < 0){
566
perror("sigprocmask");
827
perror("sigprocmask");
567
828
}
568
829
exitstatus = EXIT_FAILURE;
569
goto end;
830
goto fallback;
570
831
}
571
832
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
577
836
/* Unblock SIGCHLD so signal handler can be run if this process
578
837
has already completed */
579
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
839
if(ret < 0){
581
840
perror("sigprocmask");
582
841
exitstatus = EXIT_FAILURE;
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);
842
goto fallback;
843
}
844
845
FD_SET(new_plugin->fd, &rfds_all);
846
847
if (maxfd < new_plugin->fd){
848
maxfd = new_plugin->fd;
849
}
850
599
851
}
600
852
601
853
closedir(dir);
602
854
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
855
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
if(p->pid != 0){
858
break;
859
}
860
if(p->next == NULL){
861
fprintf(stderr, "No plugin processes started. Incorrect plugin"
862
" directory?\n");
863
free_plugin_list();
864
}
608
865
}
609
while(process_list){
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
610
869
fd_set rfds = rfds_all;
611
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
871
if (select_ret == -1){
613
872
perror("select");
614
873
exitstatus = EXIT_FAILURE;
615
goto end;
874
goto fallback;
616
875
}
617
876
/* OK, now either a process completed, or something can be read
618
877
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
620
879
/* Is this process completely done? */
621
880
if(proc->eof and proc->completed){
622
881
/* Only accept the plugin output if it exited cleanly */
623
882
if(not WIFEXITED(proc->status)
624
883
or WEXITSTATUS(proc->status) != 0){
625
884
/* Bad exit by plugin */
885
626
886
if(debug){
627
887
if(WIFEXITED(proc->status)){
628
888
fprintf(stderr, "Plugin %u exited with status %d\n",
637
897
(unsigned int) (proc->pid));
638
898
}
639
899
}
900
640
901
/* Remove the plugin */
641
902
FD_CLR(proc->fd, &rfds_all);
903
642
904
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
906
if(ret < 0){
645
907
perror("sigprocmask");
646
908
exitstatus = EXIT_FAILURE;
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
}
909
goto fallback;
910
}
911
free_plugin(proc);
662
912
/* We are done modifying process list, so unblock signal */
663
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
914
NULL);
665
915
if(ret < 0){
666
916
perror("sigprocmask");
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;
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
674
925
}
926
675
927
/* This process exited nicely, so print its buffer */
676
928
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
678
931
if(not bret){
679
932
perror("print_out_password");
680
933
exitstatus = EXIT_FAILURE;
681
934
}
682
goto end;
935
goto fallback;
683
936
}
937
684
938
/* This process has not completed. Does it have any output? */
685
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
940
/* This process had nothing to say at this time */
693
947
if (proc->buffer == NULL){
694
948
perror("malloc");
695
949
exitstatus = EXIT_FAILURE;
696
goto end;
950
goto fallback;
697
951
}
698
952
proc->buffer_size += BUFFER_SIZE;
699
953
}
714
968
}
715
969
716
970
717
end:
971
fallback:
718
972
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
721
976
bool bret;
722
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
978
char *passwordbuffer = getpass("Password: ");
725
980
if(not bret){
726
981
perror("print_out_password");
727
982
exitstatus = EXIT_FAILURE;
728
goto end;
729
983
}
730
984
}
731
985
732
986
/* Restore old signal handler */
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);
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
991
}
992
993
if(custom_argv != NULL){
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
free(*arg);
996
}
997
free(custom_argv);
742
998
}
743
999
744
1000
if(dir != NULL){
746
1002
}
747
1003
748
1004
/* Free the process list and kill the processes */
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");
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
if(p->pid != 0){
1007
close(p->fd);
1008
ret = kill(p->pid, SIGTERM);
1009
if(ret == -1 and errno != ESRCH){
1010
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1012
}
756
1013
}
757
free(process_list->buffer);
758
free(process_list);
759
1014
}
760
1015
761
1016
/* Wait for any remaining child processes to terminate */
765
1020
if(errno != ECHILD){
766
1021
perror("wait");
767
1022
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
768
1028
769
1029
return exitstatus;
770
1030
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0