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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:47:22 UTC
- mfrom: (76 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815204722-yvylhrvub57csggz
merge + minor adjustments
- 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> /* strsep, 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,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
71
69
72
70
const char *argp_program_version = "plugin-runner 1.0";
73
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
72
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*/
73
struct process;
74
75
typedef struct process{
86
76
pid_t pid;
87
77
int fd;
88
78
char *buffer;
89
79
size_t buffer_size;
90
80
size_t buffer_length;
91
81
bool eof;
92
volatile bool completed;
93
volatile int status;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
94
92
struct plugin *next;
95
93
} plugin;
96
94
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){
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
97
if ((p->name == name)
105
98
or (p->name and name and (strcmp(p->name, name) == 0))){
106
99
return p;
109
102
/* Create a new plugin */
110
103
plugin *new_plugin = malloc(sizeof(plugin));
111
104
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
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
127
109
new_plugin->argv = malloc(sizeof(char *) * 2);
128
110
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
111
perror("malloc");
112
exit(EXIT_FAILURE);
132
113
}
133
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
134
115
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
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
145
119
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
147
121
return new_plugin;
148
122
}
149
123
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));
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
187
133
}
188
134
189
135
/*
202
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
149
}
204
150
151
process *process_list = NULL;
205
152
206
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
207
154
status. */
208
155
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
}
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
236
172
}
237
173
238
/* Prints out a password to stdout */
239
174
bool print_out_password(const char *buffer, size_t length){
240
175
ssize_t ret;
241
176
if(length>0 and buffer[length-1] == '\n'){
251
186
return true;
252
187
}
253
188
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);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
266
190
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
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
278
196
}
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
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
288
209
}
289
210
290
211
int main(int argc, char *argv[]){
291
char *plugindir = NULL;
292
char *argfile = NULL;
212
const char *plugindir = "/lib/mandos/plugins.d";
213
const char *argfile = ARGFILE;
293
214
FILE *conffp;
294
215
size_t d_name_len;
295
216
DIR *dir = NULL;
310
231
/* Establish a signal handler */
311
232
sigemptyset(&sigchld_action.sa_mask);
312
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
if(ret == -1){
234
if(ret < 0){
314
235
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
236
exit(EXIT_FAILURE);
317
237
}
318
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
if(ret == -1){
239
if(ret < 0){
320
240
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
241
exit(EXIT_FAILURE);
323
242
}
324
243
325
244
/* The options we understand. */
327
246
{ .name = "global-options", .key = 'g',
328
247
.arg = "OPTION[,OPTION[,...]]",
329
248
.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
249
{ .name = "options-for", .key = 'o',
334
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
251
.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
252
{ .name = "disable", .key = 'd',
340
253
.arg = "PLUGIN",
341
254
.doc = "Disable a specific plugin", .group = 1 },
342
255
{ .name = "plugin-dir", .key = 128,
343
256
.arg = "DIRECTORY",
344
257
.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 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
356
266
{ .name = NULL }
357
267
};
358
268
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
361
270
/* Get the INPUT argument from `argp_parse', which we know is a
362
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
363
273
switch (key) {
364
case 'g': /* --global-options */
274
case 'g':
365
275
if (arg != NULL){
366
276
char *p;
367
277
while((p = strsep(&arg, ",")) != NULL){
368
278
if(p[0] == '\0'){
369
279
continue;
370
280
}
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 */
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
393
286
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
396
289
break;
397
290
}
398
291
char *opt = strsep(&arg, ":");
405
298
if(p[0] == '\0'){
406
299
continue;
407
300
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
301
addargument(getplugin(name, plugins), p);
412
302
}
413
303
}
414
304
}
415
305
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 */
306
case 'd':
436
307
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 */
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
457
315
uid = (uid_t)strtol(arg, NULL, 10);
458
316
break;
459
case 131: /* --groupid */
317
case 130:
460
318
gid = (gid_t)strtol(arg, NULL, 10);
461
319
break;
462
case 132: /* --debug */
320
case 131:
463
321
debug = true;
464
322
break;
465
323
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
325
break;
468
326
case ARGP_KEY_END:
469
327
break;
473
331
return 0;
474
332
}
475
333
334
plugin *plugin_list = NULL;
335
476
336
struct argp argp = { .options = options, .parser = parse_opt,
477
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
478
338
.doc = "Mandos plugin runner -- Run plugins" };
479
339
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
481
341
if (ret == ARGP_ERR_UNKNOWN){
482
342
fprintf(stderr, "Unknown error while parsing arguments\n");
483
343
exitstatus = EXIT_FAILURE;
484
goto fallback;
344
goto end;
485
345
}
486
346
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
347
conffp = fopen(argfile, "r");
493
348
if(conffp != NULL){
494
349
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
496
350
size_t size = 0;
497
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
498
353
const char whitespace_delims[] = " \r\t\f\v\n";
499
354
const char comment_delim[] = "#";
500
355
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
504
perror("malloc");
505
exitstatus = EXIT_FAILURE;
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
356
while(true){
514
357
sret = getline(&org_line, &size, conffp);
515
358
if(sret == -1){
523
366
continue;
524
367
}
525
368
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;
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
544
375
}
545
376
}
546
377
free(org_line);
550
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
382
perror("fopen");
552
383
exitstatus = EXIT_FAILURE;
553
goto fallback;
384
goto end;
554
385
}
555
386
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
387
558
388
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
560
391
if (ret == ARGP_ERR_UNKNOWN){
561
392
fprintf(stderr, "Unknown error while parsing arguments\n");
562
393
exitstatus = EXIT_FAILURE;
563
goto fallback;
394
goto end;
564
395
}
565
396
}
566
397
571
402
for(char **a = p->argv; *a != NULL; a++){
572
403
fprintf(stderr, "\tArg: %s\n", *a);
573
404
}
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
}
578
405
}
579
406
}
580
581
/* Strip permissions down to nobody */
407
582
408
ret = setuid(uid);
583
409
if (ret == -1){
584
410
perror("setuid");
585
}
411
}
412
586
413
setgid(gid);
587
414
if (ret == -1){
588
415
perror("setgid");
589
416
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
417
418
dir = opendir(plugindir);
597
419
if(dir == NULL){
598
420
perror("Could not open plugin dir");
599
421
exitstatus = EXIT_FAILURE;
600
goto fallback;
422
goto end;
601
423
}
602
424
603
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
608
430
if(ret < 0){
609
431
perror("set_cloexec_flag");
610
432
exitstatus = EXIT_FAILURE;
611
goto fallback;
433
goto end;
612
434
}
613
435
}
614
436
}
615
437
616
438
FD_ZERO(&rfds_all);
617
618
/* Read and execute any executable in the plugin directory*/
439
619
440
while(true){
620
441
dirst = readdir(dir);
621
442
624
445
if (errno == EBADF){
625
446
perror("readdir");
626
447
exitstatus = EXIT_FAILURE;
627
goto fallback;
448
goto end;
628
449
}
629
450
break;
630
451
}
652
473
break;
653
474
}
654
475
}
476
655
477
if(bad_name){
656
478
continue;
657
479
}
480
658
481
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
482
size_t suf_len = strlen(*suf);
660
483
if((d_name_len >= suf_len)
673
496
continue;
674
497
}
675
498
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
499
500
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
501
if (filename == NULL){
502
perror("malloc");
681
503
continue;
682
504
}
505
strcpy(filename, plugindir); /* Spurious warning */
506
strcat(filename, "/"); /* Spurious warning */
507
strcat(filename, dirst->d_name); /* Spurious warning */
683
508
684
509
ret = stat(filename, &st);
685
510
if (ret == -1){
687
512
free(filename);
688
513
continue;
689
514
}
690
691
/* Ignore non-executable files */
515
692
516
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
693
517
if(debug){
694
518
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
697
521
free(filename);
698
522
continue;
699
523
}
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){
524
if(getplugin(dirst->d_name, &plugin_list)->disabled){
708
525
if(debug){
709
526
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
710
527
dirst->d_name);
712
529
free(filename);
713
530
continue;
714
531
}
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
715
533
{
716
534
/* Add global arguments to argument list for this plugin */
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];
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
537
addargument(p, *a);
538
}
539
}
540
int pipefd[2];
749
541
ret = pipe(pipefd);
750
542
if (ret == -1){
751
543
perror("pipe");
752
544
exitstatus = EXIT_FAILURE;
753
goto fallback;
545
goto end;
754
546
}
755
/* Ask OS to automatic close the pipe on exec */
756
547
ret = set_cloexec_flag(pipefd[0]);
757
548
if(ret < 0){
758
549
perror("set_cloexec_flag");
759
550
exitstatus = EXIT_FAILURE;
760
goto fallback;
551
goto end;
761
552
}
762
553
ret = set_cloexec_flag(pipefd[1]);
763
554
if(ret < 0){
764
555
perror("set_cloexec_flag");
765
556
exitstatus = EXIT_FAILURE;
766
goto fallback;
557
goto end;
767
558
}
768
559
/* Block SIGCHLD until process is safely in process list */
769
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
770
561
if(ret < 0){
771
562
perror("sigprocmask");
772
563
exitstatus = EXIT_FAILURE;
773
goto fallback;
564
goto end;
774
565
}
775
566
// Starting a new process to be watched
776
567
pid_t pid = fork();
777
568
if(pid == -1){
778
569
perror("fork");
779
570
exitstatus = EXIT_FAILURE;
780
goto fallback;
571
goto end;
781
572
}
782
573
if(pid == 0){
783
574
/* this is the child process */
803
594
above and must now close it manually here. */
804
595
closedir(dir);
805
596
}
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
}
597
if(execv(filename, p->argv) < 0){
598
perror("execv");
599
_exit(EXIT_FAILURE);
816
600
}
817
601
/* no return */
818
602
}
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
603
/* parent process */
821
604
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
608
perror("malloc");
825
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
826
610
if(ret < 0){
827
perror("sigprocmask");
611
perror("sigprocmask");
828
612
}
829
613
exitstatus = EXIT_FAILURE;
830
goto fallback;
614
goto end;
831
615
}
832
616
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
617
*new_process = (struct process){ .pid = pid,
618
.fd = pipefd[0],
619
.next = process_list };
620
// List handling
621
process_list = new_process;
836
622
/* Unblock SIGCHLD so signal handler can be run if this process
837
623
has already completed */
838
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
839
625
if(ret < 0){
840
626
perror("sigprocmask");
841
627
exitstatus = EXIT_FAILURE;
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
628
goto end;
629
}
630
631
FD_SET(new_process->fd, &rfds_all);
632
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
635
}
636
637
}
638
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
643
free(plugin_list);
851
644
}
852
645
853
646
closedir(dir);
854
647
dir = 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
}
648
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
651
" directory?\n");
652
process_list = NULL;
865
653
}
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
654
while(process_list){
869
655
fd_set rfds = rfds_all;
870
656
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
871
657
if (select_ret == -1){
872
658
perror("select");
873
659
exitstatus = EXIT_FAILURE;
874
goto fallback;
660
goto end;
875
661
}
876
662
/* OK, now either a process completed, or something can be read
877
663
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
664
for(process *proc = process_list; proc ; proc = proc->next){
879
665
/* Is this process completely done? */
880
666
if(proc->eof and proc->completed){
881
667
/* Only accept the plugin output if it exited cleanly */
882
668
if(not WIFEXITED(proc->status)
883
669
or WEXITSTATUS(proc->status) != 0){
884
670
/* Bad exit by plugin */
885
886
671
if(debug){
887
672
if(WIFEXITED(proc->status)){
888
673
fprintf(stderr, "Plugin %u exited with status %d\n",
897
682
(unsigned int) (proc->pid));
898
683
}
899
684
}
900
901
685
/* Remove the plugin */
902
686
FD_CLR(proc->fd, &rfds_all);
903
904
687
/* Block signal while modifying process_list */
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
906
689
if(ret < 0){
907
690
perror("sigprocmask");
908
691
exitstatus = EXIT_FAILURE;
909
goto fallback;
910
}
911
free_plugin(proc);
692
goto end;
693
}
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
698
} else {
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
701
if(p->next == proc){
702
p->next = proc->next;
703
break;
704
}
705
}
706
}
912
707
/* We are done modifying process list, so unblock signal */
913
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
709
NULL);
915
710
if(ret < 0){
916
711
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
712
}
713
free(proc->buffer);
714
free(proc);
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
717
the process list */
718
break;
925
719
}
926
927
720
/* This process exited nicely, so print its buffer */
928
721
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
931
723
if(not bret){
932
724
perror("print_out_password");
933
725
exitstatus = EXIT_FAILURE;
934
726
}
935
goto fallback;
727
goto end;
936
728
}
937
938
729
/* This process has not completed. Does it have any output? */
939
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
731
/* This process had nothing to say at this time */
947
738
if (proc->buffer == NULL){
948
739
perror("malloc");
949
740
exitstatus = EXIT_FAILURE;
950
goto fallback;
741
goto end;
951
742
}
952
743
proc->buffer_size += BUFFER_SIZE;
953
744
}
968
759
}
969
760
970
761
971
fallback:
762
end:
972
763
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
976
766
bool bret;
977
767
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
768
char *passwordbuffer = getpass("Password: ");
980
770
if(not bret){
981
771
perror("print_out_password");
982
772
exitstatus = EXIT_FAILURE;
773
goto end;
983
774
}
984
775
}
985
776
986
777
/* Restore old signal handler */
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);
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
779
780
free(custom_argv);
781
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
786
free(plugin_list);
998
787
}
999
788
1000
789
if(dir != NULL){
1002
791
}
1003
792
1004
793
/* Free the process list and kill the processes */
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
}
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
800
perror("kill");
1013
801
}
802
free(process_list->buffer);
803
free(process_list);
1014
804
}
1015
805
1016
806
/* Wait for any remaining child processes to terminate */
1020
810
if(errno != ECHILD){
1021
811
perror("wait");
1022
812
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
1028
813
1029
814
return exitstatus;
1030
815
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0