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- Committer: Björn Påhlsson
- Date: 2008-08-14 01:32:34 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 75.
- Revision ID: belorn@braxen-20080814013234-qs0s608s3gxwb5t7
changed from using strtok to strsep
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- files modified:
- Makefile
added
removed
mandos-client.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,
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
const char *argp_program_version = "plugin-runner 1.0";
69
const char *argp_program_version = "mandos-client 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, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
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;
204
132
}
205
133
206
134
/*
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
154
void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
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;
253
171
}
254
172
255
/* Prints out a password to stdout */
256
173
bool print_out_password(const char *buffer, size_t length){
257
174
ssize_t ret;
258
175
if(length>0 and buffer[length-1] == '\n'){
268
185
return true;
269
186
}
270
187
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
306
307
188
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
190
size_t d_name_len;
312
191
DIR *dir = NULL;
313
192
struct dirent *dirst;
321
200
struct sigaction old_sigchld_action;
322
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
202
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
327
206
/* Establish a signal handler */
328
207
sigemptyset(&sigchld_action.sa_mask);
329
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
209
if(ret < 0){
331
210
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
211
exit(EXIT_FAILURE);
334
212
}
335
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
214
if(ret < 0){
337
215
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
216
exit(EXIT_FAILURE);
340
217
}
341
218
342
219
/* The options we understand. */
344
221
{ .name = "global-options", .key = 'g',
345
222
.arg = "OPTION[,OPTION[,...]]",
346
223
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
224
{ .name = "options-for", .key = 'o',
351
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
226
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
227
{ .name = "disable", .key = 'd',
357
228
.arg = "PLUGIN",
358
229
.doc = "Disable a specific plugin", .group = 1 },
359
230
{ .name = "plugin-dir", .key = 128,
360
231
.arg = "DIRECTORY",
361
232
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.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 },
373
241
{ .name = NULL }
374
242
};
375
243
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
378
245
/* Get the INPUT argument from `argp_parse', which we know is a
379
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
380
248
switch (key) {
381
case 'g': /* --global-options */
249
case 'g':
382
250
if (arg != NULL){
383
251
char *p;
384
252
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
253
if(strcmp(p, "") == 0){
386
254
continue;
387
255
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
407
}
408
break;
409
case 'o': /* --options-for */
256
addargument(getplugin(NULL, plugins), p);
257
}
258
}
259
break;
260
case 'o':
410
261
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
413
264
break;
414
265
}
415
266
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
267
if(strcmp(opt, "") == 0){
417
268
break;
418
269
}
419
270
if(opt != NULL){
420
271
char *p;
421
272
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
273
if(strcmp(p, "") == 0){
423
274
continue;
424
275
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
276
addargument(getplugin(name, plugins), p);
429
277
}
430
278
}
431
279
}
432
280
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
437
{
438
char *envdef = strchr(arg, ':');
439
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
446
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
449
}
450
}
451
break;
452
case 'd': /* --disable */
281
case 'd':
453
282
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
459
}
460
break;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
473
case 130: /* --userid */
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
474
290
uid = (uid_t)strtol(arg, NULL, 10);
475
291
break;
476
case 131: /* --groupid */
292
case 130:
477
293
gid = (gid_t)strtol(arg, NULL, 10);
478
294
break;
479
case 132: /* --debug */
295
case 131:
480
296
debug = true;
481
297
break;
482
298
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
301
}
302
plus_options = arg;
484
303
break;
485
304
case ARGP_KEY_END:
486
305
break;
490
309
return 0;
491
310
}
492
311
312
plugin *plugin_list = NULL;
313
493
314
struct argp argp = { .options = options, .parser = parse_opt,
494
.args_doc = "",
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
495
316
.doc = "Mandos plugin runner -- Run plugins" };
496
317
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
500
} else {
501
conffp = fopen(argfile, "r");
502
}
503
if(conffp != NULL){
504
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
506
size_t size = 0;
507
ssize_t sret;
508
const char whitespace_delims[] = " \r\t\f\v\n";
509
const char comment_delim[] = "#";
510
511
custom_argc = 1;
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
319
if (ret == ARGP_ERR_UNKNOWN){
320
fprintf(stderr, "Unknown error while parsing arguments\n");
321
exitstatus = EXIT_FAILURE;
322
goto end;
323
}
324
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
514
335
perror("malloc");
515
336
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
520
521
/* for each line in the config file, strip whitespace and ignore
522
commented text */
523
while(true){
524
sret = getline(&org_line, &size, conffp);
525
if(sret == -1){
526
break;
527
}
528
529
line = org_line;
530
arg = strsep(&line, comment_delim);
531
while((p = strsep(&arg, whitespace_delims)) != NULL){
532
if(p[0] == '\0'){
533
continue;
534
}
535
new_arg = strdup(p);
536
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
543
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
551
}
552
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
554
}
555
}
556
free(org_line);
557
} else {
558
/* Check for harmful errors and go to fallback. Other errors might
559
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
568
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
571
356
if (ret == ARGP_ERR_UNKNOWN){
572
357
fprintf(stderr, "Unknown error while parsing arguments\n");
573
358
exitstatus = EXIT_FAILURE;
574
goto fallback;
359
goto end;
575
360
}
576
361
}
577
362
578
/* Parse actual command line arguments, to let them override the
579
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
585
}
586
587
363
if(debug){
588
364
for(plugin *p = plugin_list; p != NULL; p=p->next){
589
365
fprintf(stderr, "Plugin: %s has %d arguments\n",
591
367
for(char **a = p->argv; *a != NULL; a++){
592
368
fprintf(stderr, "\tArg: %s\n", *a);
593
369
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
595
for(char **a = p->environ; *a != NULL; a++){
596
fprintf(stderr, "\t%s\n", *a);
597
}
598
370
}
599
371
}
600
372
601
/* Strip permissions down to nobody */
602
373
ret = setuid(uid);
603
374
if (ret == -1){
604
375
perror("setuid");
605
}
376
}
377
606
378
setgid(gid);
607
379
if (ret == -1){
608
380
perror("setgid");
609
381
}
610
382
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
383
dir = opendir(plugindir);
617
384
if(dir == NULL){
618
385
perror("Could not open plugin dir");
619
386
exitstatus = EXIT_FAILURE;
620
goto fallback;
387
goto end;
621
388
}
622
389
623
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
628
395
if(ret < 0){
629
396
perror("set_cloexec_flag");
630
397
exitstatus = EXIT_FAILURE;
631
goto fallback;
398
goto end;
632
399
}
633
400
}
634
401
}
635
402
636
403
FD_ZERO(&rfds_all);
637
404
638
/* Read and execute any executable in the plugin directory*/
639
405
while(true){
640
406
dirst = readdir(dir);
641
407
642
/* All directory entries have been processed */
408
// All directory entries have been processed
643
409
if(dirst == NULL){
644
410
if (errno == EBADF){
645
411
perror("readdir");
646
412
exitstatus = EXIT_FAILURE;
647
goto fallback;
413
goto end;
648
414
}
649
415
break;
650
416
}
651
417
652
418
d_name_len = strlen(dirst->d_name);
653
419
654
/* Ignore dotfiles, backup files and other junk */
420
// Ignore dotfiles, backup files and other junk
655
421
{
656
422
bool bad_name = false;
657
423
672
438
break;
673
439
}
674
440
}
441
675
442
if(bad_name){
676
443
continue;
677
444
}
445
678
446
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
447
size_t suf_len = strlen(*suf);
680
448
if((d_name_len >= suf_len)
693
461
continue;
694
462
}
695
463
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
701
468
continue;
702
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
703
473
704
474
ret = stat(filename, &st);
705
475
if (ret == -1){
707
477
free(filename);
708
478
continue;
709
479
}
710
711
/* Ignore non-executable files */
480
712
481
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
713
482
if(debug){
714
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
717
486
free(filename);
718
487
continue;
719
488
}
720
721
plugin *p = getplugin(dirst->d_name);
722
if(p == NULL){
723
perror("getplugin");
724
free(filename);
725
continue;
726
}
727
if(p->disabled){
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
728
490
if(debug){
729
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
730
492
dirst->d_name);
732
494
free(filename);
733
495
continue;
734
496
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
735
498
{
736
499
/* Add global arguments to argument list for this plugin */
737
plugin *g = getplugin(NULL);
738
if(g != NULL){
739
for(char **a = g->argv + 1; *a != NULL; a++){
740
if(not add_argument(p, *a)){
741
perror("add_argument");
742
}
743
}
744
/* Add global environment variables */
745
for(char **e = g->environ; *e != NULL; e++){
746
if(not add_environment(p, *e, false)){
747
perror("add_environment");
748
}
749
}
750
}
751
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
755
if(p->environ[0] != NULL){
756
for(char **e = environ; *e != NULL; e++){
757
if(not add_environment(p, *e, false)){
758
perror("add_environment");
759
}
760
}
761
}
762
763
int pipefd[2];
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
764
506
ret = pipe(pipefd);
765
507
if (ret == -1){
766
508
perror("pipe");
767
509
exitstatus = EXIT_FAILURE;
768
goto fallback;
510
goto end;
769
511
}
770
/* Ask OS to automatic close the pipe on exec */
771
512
ret = set_cloexec_flag(pipefd[0]);
772
513
if(ret < 0){
773
514
perror("set_cloexec_flag");
774
515
exitstatus = EXIT_FAILURE;
775
goto fallback;
516
goto end;
776
517
}
777
518
ret = set_cloexec_flag(pipefd[1]);
778
519
if(ret < 0){
779
520
perror("set_cloexec_flag");
780
521
exitstatus = EXIT_FAILURE;
781
goto fallback;
522
goto end;
782
523
}
783
524
/* Block SIGCHLD until process is safely in process list */
784
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
785
526
if(ret < 0){
786
527
perror("sigprocmask");
787
528
exitstatus = EXIT_FAILURE;
788
goto fallback;
529
goto end;
789
530
}
790
/* Starting a new process to be watched */
531
// Starting a new process to be watched
791
532
pid_t pid = fork();
792
533
if(pid == -1){
793
534
perror("fork");
794
535
exitstatus = EXIT_FAILURE;
795
goto fallback;
536
goto end;
796
537
}
797
538
if(pid == 0){
798
539
/* this is the child process */
818
559
above and must now close it manually here. */
819
560
closedir(dir);
820
561
}
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
831
565
}
832
566
/* no return */
833
567
}
834
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
568
/* parent process */
836
569
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
840
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
841
575
if(ret < 0){
842
perror("sigprocmask");
576
perror("sigprocmask");
843
577
}
844
578
exitstatus = EXIT_FAILURE;
845
goto fallback;
579
goto end;
846
580
}
847
581
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
850
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
851
587
/* Unblock SIGCHLD so signal handler can be run if this process
852
588
has already completed */
853
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
590
if(ret < 0){
855
591
perror("sigprocmask");
856
592
exitstatus = EXIT_FAILURE;
857
goto fallback;
858
}
859
860
FD_SET(new_plugin->fd, &rfds_all);
861
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
864
}
865
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
866
609
}
867
610
868
611
closedir(dir);
869
612
dir = NULL;
870
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
if(p->pid != 0){
873
break;
874
}
875
if(p->next == NULL){
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
877
" directory?\n");
878
free_plugin_list();
879
}
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
880
618
}
881
882
/* Main loop while running plugins exist */
883
while(plugin_list){
619
while(process_list){
884
620
fd_set rfds = rfds_all;
885
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
622
if (select_ret == -1){
887
623
perror("select");
888
624
exitstatus = EXIT_FAILURE;
889
goto fallback;
625
goto end;
890
626
}
891
627
/* OK, now either a process completed, or something can be read
892
628
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
629
for(process *proc = process_list; proc ; proc = proc->next){
894
630
/* Is this process completely done? */
895
631
if(proc->eof and proc->completed){
896
632
/* Only accept the plugin output if it exited cleanly */
897
633
if(not WIFEXITED(proc->status)
898
634
or WEXITSTATUS(proc->status) != 0){
899
635
/* Bad exit by plugin */
900
901
636
if(debug){
902
637
if(WIFEXITED(proc->status)){
903
638
fprintf(stderr, "Plugin %u exited with status %d\n",
912
647
(unsigned int) (proc->pid));
913
648
}
914
649
}
915
916
650
/* Remove the plugin */
917
651
FD_CLR(proc->fd, &rfds_all);
918
919
652
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
921
654
if(ret < 0){
922
655
perror("sigprocmask");
923
656
exitstatus = EXIT_FAILURE;
924
goto fallback;
925
}
926
free_plugin(proc);
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
927
672
/* We are done modifying process list, so unblock signal */
928
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
674
NULL);
930
675
if(ret < 0){
931
676
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
933
goto fallback;
934
}
935
936
if(plugin_list == NULL){
937
break;
938
}
939
continue;
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
940
684
}
941
942
685
/* This process exited nicely, so print its buffer */
943
686
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
946
688
if(not bret){
947
689
perror("print_out_password");
948
690
exitstatus = EXIT_FAILURE;
949
691
}
950
goto fallback;
692
goto end;
951
693
}
952
953
694
/* This process has not completed. Does it have any output? */
954
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
696
/* This process had nothing to say at this time */
962
703
if (proc->buffer == NULL){
963
704
perror("malloc");
964
705
exitstatus = EXIT_FAILURE;
965
goto fallback;
706
goto end;
966
707
}
967
708
proc->buffer_size += BUFFER_SIZE;
968
709
}
983
724
}
984
725
985
726
986
fallback:
727
end:
987
728
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
990
occured */
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
991
731
bool bret;
992
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
733
char *passwordbuffer = getpass("Password: ");
995
735
if(not bret){
996
736
perror("print_out_password");
997
737
exitstatus = EXIT_FAILURE;
738
goto end;
998
739
}
999
740
}
1000
741
1001
742
/* Restore old signal handler */
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1006
}
1007
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
free(*arg);
1011
}
1012
free(custom_argv);
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
1013
752
}
1014
753
1015
754
if(dir != NULL){
1017
756
}
1018
757
1019
758
/* Free the process list and kill the processes */
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
if(p->pid != 0){
1022
close(p->fd);
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1027
}
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
1028
766
}
767
free(process_list->buffer);
768
free(process_list);
1029
769
}
1030
770
1031
771
/* Wait for any remaining child processes to terminate */
1035
775
if(errno != ECHILD){
1036
776
perror("wait");
1037
777
}
1038
1039
free_plugin_list();
1040
1041
free(plugindir);
1042
free(argfile);
1043
778
1044
779
return exitstatus;
1045
780
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0