To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 232
- compare with another revision
- download diff
- download tarball
- view history from revision 232
- Committer: Teddy Hogeborn
- Date: 2008-10-17 18:56:25 UTC
- Revision ID: teddy@fukt.bsnet.se-20081017185625-xrfv8oevzm7lyvl6
Tags: version-1.0.2-1
* Makefile (version): Changed to "1.0.2".
* NEWS (Version 1.0.2): New entry.
* debian/changelog (1.0.2-1): New entry.
* NEWS (Version 1.0.2): New entry.
* debian/changelog (1.0.2-1): New entry.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
29
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, fileno(), fprintf(),
31
stderr, STDOUT_FILENO */
32
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
33
stat, waitpid(), WIFEXITED(),
34
34
WEXITSTATUS(), wait(), pid_t,
46
46
fcntl(), setuid(), setgid(),
47
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
49
dup2(), STDOUT_FILENO, _exit(),
50
50
execv(), write(), read(),
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
61
#include <signal.h> /* struct sigaction, sigemptyset(),
61
62
sigaddset(), sigaction(),
62
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
#include <errno.h> /* errno, EBADF */
65
66
66
67
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
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 " VERSION;
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
75
typedef struct plugin{
87
76
char *name; /* can be NULL or any plugin name */
88
77
char **argv;
90
79
char **environ;
91
80
int envc;
92
81
bool disabled;
82
83
/* Variables used for running processes*/
84
pid_t pid;
85
int fd;
86
char *buffer;
87
size_t buffer_size;
88
size_t buffer_length;
89
bool eof;
90
volatile bool completed;
91
volatile int status;
93
92
struct plugin *next;
94
93
} plugin;
95
94
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
98
102
if ((p->name == name)
99
103
or (p->name and name and (strcmp(p->name, name) == 0))){
100
104
return p;
105
109
if (new_plugin == NULL){
106
110
return NULL;
107
111
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
112
char *copy_name = NULL;
113
if(name != NULL){
114
copy_name = strdup(name);
115
if(copy_name == NULL){
116
return NULL;
117
}
111
118
}
112
119
113
120
*new_plugin = (plugin) { .name = copy_name,
114
121
.argc = 1,
115
.envc = 0,
116
122
.disabled = false,
117
.next = *plugin_list };
123
.next = plugin_list };
118
124
119
125
new_plugin->argv = malloc(sizeof(char *) * 2);
120
126
if (new_plugin->argv == NULL){
127
free(copy_name);
121
128
free(new_plugin);
122
129
return NULL;
123
130
}
124
131
new_plugin->argv[0] = copy_name;
125
132
new_plugin->argv[1] = NULL;
126
133
127
134
new_plugin->environ = malloc(sizeof(char *));
128
135
if(new_plugin->environ == NULL){
136
free(copy_name);
129
137
free(new_plugin->argv);
130
138
free(new_plugin);
131
139
return NULL;
132
140
}
133
141
new_plugin->environ[0] = NULL;
142
134
143
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
136
145
return new_plugin;
137
146
}
138
147
168
177
}
169
178
170
179
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
172
181
if(p == NULL){
173
182
return false;
174
183
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
175
201
return add_to_char_array(def, &(p->environ), &(p->envc));
176
202
}
177
203
178
179
204
/*
180
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
206
* Descriptor Flags".
182
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
183
208
*/
184
static int set_cloexec_flag(int fd)
185
{
209
static int set_cloexec_flag(int fd){
186
210
int ret = fcntl(fd, F_GETFD, 0);
187
211
/* If reading the flags failed, return error indication now. */
188
212
if(ret < 0){
192
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
217
}
194
218
195
process *process_list = NULL;
196
219
197
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
198
221
status. */
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
222
static void handle_sigchld(__attribute__((unused)) int sig){
223
while(true){
224
plugin *proc = plugin_list;
225
int status;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
227
if(pid == 0){
228
/* Only still running child processes */
229
break;
230
}
231
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
234
}
235
/* No child processes */
236
break;
237
}
238
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
241
proc = proc->next;
242
}
243
if(proc == NULL){
244
/* Process not found in process list */
245
continue;
246
}
247
proc->status = status;
248
proc->completed = true;
249
}
216
250
}
217
251
218
bool print_out_password(const char *buffer, size_t length){
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
219
254
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
255
for(size_t written = 0; written < length; written += (size_t)ret){
224
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
257
length - written));
230
262
return true;
231
263
}
232
264
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
239
289
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
290
}
291
292
free(plugin_node);
252
293
}
253
294
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
298
}
268
299
}
269
300
270
301
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
273
304
FILE *conffp;
274
305
size_t d_name_len;
275
306
DIR *dir = NULL;
298
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
330
if(ret == -1){
300
331
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
332
exitstatus = EXIT_FAILURE;
302
333
goto fallback;
303
334
}
304
335
307
338
{ .name = "global-options", .key = 'g',
308
339
.arg = "OPTION[,OPTION[,...]]",
309
340
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
311
342
.arg = "VAR=value",
312
343
.doc = "Environment variable passed to all plugins" },
313
344
{ .name = "options-for", .key = 'o',
314
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
346
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
317
348
.arg = "PLUGIN:ENV=value",
318
349
.doc = "Environment variable passed to specified plugin" },
319
350
{ .name = "disable", .key = 'd',
320
351
.arg = "PLUGIN",
321
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
322
356
{ .name = "plugin-dir", .key = 128,
323
357
.arg = "DIRECTORY",
324
358
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
333
370
{ .name = NULL }
334
371
};
335
372
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
340
375
switch (key) {
341
case 'g':
376
case 'g': /* --global-options */
342
377
if (arg != NULL){
343
378
char *p;
344
379
while((p = strsep(&arg, ",")) != NULL){
345
380
if(p[0] == '\0'){
346
381
continue;
347
382
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
349
384
perror("add_argument");
350
385
return ARGP_ERR_UNKNOWN;
351
386
}
352
387
}
353
388
}
354
389
break;
355
case 'e':
390
case 'G': /* --global-env */
356
391
if(arg == NULL){
357
392
break;
358
393
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
367
396
}
368
397
break;
369
case 'o':
398
case 'o': /* --options-for */
370
399
if (arg != NULL){
371
400
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
373
402
break;
374
403
}
375
404
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
377
406
break;
378
407
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
389
416
}
390
417
}
391
418
}
392
419
break;
393
case 'f':
420
case 'E': /* --env-for */
394
421
if(arg == NULL){
395
422
break;
396
423
}
399
426
if(envdef == NULL){
400
427
break;
401
428
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
408
431
perror("add_environment");
409
432
}
410
433
}
411
434
break;
412
case 'd':
435
case 'd': /* --disable */
413
436
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
415
438
if(p == NULL){
416
439
return ARGP_ERR_UNKNOWN;
417
440
}
418
441
p->disabled = true;
419
442
}
420
443
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
425
464
uid = (uid_t)strtol(arg, NULL, 10);
426
465
break;
427
case 130:
466
case 131: /* --groupid */
428
467
gid = (gid_t)strtol(arg, NULL, 10);
429
468
break;
430
case 131:
469
case 132: /* --debug */
431
470
debug = true;
432
471
break;
433
472
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
448
524
.doc = "Mandos plugin runner -- Run plugins" };
449
525
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
451
529
if (ret == ARGP_ERR_UNKNOWN){
452
530
fprintf(stderr, "Unknown error while parsing arguments\n");
453
531
exitstatus = EXIT_FAILURE;
454
532
goto fallback;
455
533
}
456
457
conffp = fopen(argfile, "r");
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
458
544
if(conffp != NULL){
459
545
char *org_line = NULL;
460
546
char *p, *arg, *new_arg, *line;
463
549
const char whitespace_delims[] = " \r\t\f\v\n";
464
550
const char comment_delim[] = "#";
465
551
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
466
564
while(true){
467
565
sret = getline(&org_line, &size, conffp);
468
566
if(sret == -1){
476
574
continue;
477
575
}
478
576
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
485
595
}
486
596
}
487
597
free(org_line);
488
} else{
598
} else {
489
599
/* Check for harmful errors and go to fallback. Other errors might
490
600
not affect opening plugins */
491
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
494
604
goto fallback;
495
605
}
496
606
}
497
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
498
609
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
501
612
if (ret == ARGP_ERR_UNKNOWN){
502
613
fprintf(stderr, "Unknown error while parsing arguments\n");
503
614
exitstatus = EXIT_FAILURE;
505
616
}
506
617
}
507
618
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
508
628
if(debug){
509
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
639
}
520
640
}
521
641
642
/* Strip permissions down to nobody */
522
643
ret = setuid(uid);
523
644
if (ret == -1){
524
645
perror("setuid");
525
}
526
646
}
527
647
setgid(gid);
528
648
if (ret == -1){
529
649
perror("setgid");
530
650
}
531
651
532
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
533
658
if(dir == NULL){
534
659
perror("Could not open plugin dir");
535
660
exitstatus = EXIT_FAILURE;
551
676
552
677
FD_ZERO(&rfds_all);
553
678
679
/* Read and execute any executable in the plugin directory*/
554
680
while(true){
555
681
dirst = readdir(dir);
556
682
557
// All directory entries have been processed
683
/* All directory entries have been processed */
558
684
if(dirst == NULL){
559
685
if (errno == EBADF){
560
686
perror("readdir");
566
692
567
693
d_name_len = strlen(dirst->d_name);
568
694
569
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
570
696
{
571
697
bool bad_name = false;
572
698
587
713
break;
588
714
}
589
715
}
590
591
716
if(bad_name){
592
717
continue;
593
718
}
594
595
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
720
size_t suf_len = strlen(*suf);
597
721
if((d_name_len >= suf_len)
612
736
}
613
737
614
738
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
616
744
if(ret < 0){
617
745
perror("asprintf");
618
746
continue;
624
752
free(filename);
625
753
continue;
626
754
}
627
755
756
/* Ignore non-executable files */
628
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
758
if(debug){
630
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
633
762
free(filename);
634
763
continue;
635
764
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
765
766
plugin *p = getplugin(dirst->d_name);
637
767
if(p == NULL){
638
768
perror("getplugin");
639
769
free(filename);
649
779
}
650
780
{
651
781
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
782
plugin *g = getplugin(NULL);
653
783
if(g != NULL){
654
784
for(char **a = g->argv + 1; *a != NULL; a++){
655
785
if(not add_argument(p, *a)){
658
788
}
659
789
/* Add global environment variables */
660
790
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
791
if(not add_environment(p, *e, false)){
662
792
perror("add_environment");
663
793
}
664
794
}
669
799
process, too. */
670
800
if(p->environ[0] != NULL){
671
801
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
802
if(not add_environment(p, *e, false)){
678
803
perror("add_environment");
679
804
}
680
805
}
681
806
}
682
807
683
int pipefd[2];
808
int pipefd[2];
684
809
ret = pipe(pipefd);
685
810
if (ret == -1){
686
811
perror("pipe");
687
812
exitstatus = EXIT_FAILURE;
688
813
goto fallback;
689
814
}
815
/* Ask OS to automatic close the pipe on exec */
690
816
ret = set_cloexec_flag(pipefd[0]);
691
817
if(ret < 0){
692
818
perror("set_cloexec_flag");
706
832
exitstatus = EXIT_FAILURE;
707
833
goto fallback;
708
834
}
709
// Starting a new process to be watched
835
/* Starting a new process to be watched */
710
836
pid_t pid = fork();
711
837
if(pid == -1){
712
838
perror("fork");
720
846
perror("sigaction");
721
847
_exit(EXIT_FAILURE);
722
848
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
850
if(ret < 0){
725
851
perror("sigprocmask");
726
852
_exit(EXIT_FAILURE);
727
853
}
728
854
729
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
856
if(ret == -1){
731
857
perror("dup2");
750
876
}
751
877
/* no return */
752
878
}
753
/* parent process */
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
754
881
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
759
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
886
if(ret < 0){
761
perror("sigprocmask");
887
perror("sigprocmask");
762
888
}
763
889
exitstatus = EXIT_FAILURE;
764
890
goto fallback;
765
891
}
766
892
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
772
896
/* Unblock SIGCHLD so signal handler can be run if this process
773
897
has already completed */
774
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
902
goto fallback;
779
903
}
780
904
781
FD_SET(new_process->fd, &rfds_all);
905
FD_SET(new_plugin->fd, &rfds_all);
782
906
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
785
909
}
786
787
910
}
788
911
789
free_plugin_list(plugin_list);
790
791
912
closedir(dir);
792
913
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
914
915
for(plugin *p = plugin_list; p != NULL; p = p->next){
916
if(p->pid != 0){
917
break;
918
}
919
if(p->next == NULL){
920
fprintf(stderr, "No plugin processes started. Incorrect plugin"
921
" directory?\n");
922
free_plugin_list();
923
}
798
924
}
799
while(process_list){
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
800
928
fd_set rfds = rfds_all;
801
929
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
930
if (select_ret == -1){
806
934
}
807
935
/* OK, now either a process completed, or something can be read
808
936
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
937
for(plugin *proc = plugin_list; proc != NULL;){
810
938
/* Is this process completely done? */
811
939
if(proc->eof and proc->completed){
812
940
/* Only accept the plugin output if it exited cleanly */
813
941
if(not WIFEXITED(proc->status)
814
942
or WEXITSTATUS(proc->status) != 0){
815
943
/* Bad exit by plugin */
944
816
945
if(debug){
817
946
if(WIFEXITED(proc->status)){
818
947
fprintf(stderr, "Plugin %u exited with status %d\n",
827
956
(unsigned int) (proc->pid));
828
957
}
829
958
}
959
830
960
/* Remove the plugin */
831
961
FD_CLR(proc->fd, &rfds_all);
962
832
963
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
965
if(ret < 0){
835
966
perror("sigprocmask");
836
967
exitstatus = EXIT_FAILURE;
837
968
goto fallback;
838
969
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
852
975
/* We are done modifying process list, so unblock signal */
853
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
977
NULL);
855
978
if(ret < 0){
856
979
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
864
989
}
990
865
991
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
992
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
868
995
if(not bret){
869
996
perror("print_out_password");
870
997
exitstatus = EXIT_FAILURE;
871
998
}
872
999
goto fallback;
873
1000
}
1001
874
1002
/* This process has not completed. Does it have any output? */
875
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1004
/* This process had nothing to say at this time */
1005
proc = proc->next;
877
1006
continue;
878
1007
}
879
1008
/* Before reading, make the process' data buffer large enough */
892
1021
BUFFER_SIZE);
893
1022
if(ret < 0){
894
1023
/* Read error from this process; ignore the error */
1024
proc = proc->next;
895
1025
continue;
896
1026
}
897
1027
if(ret == 0){
906
1036
907
1037
fallback:
908
1038
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
911
1042
bool bret;
912
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1044
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
915
1052
if(not bret){
916
1053
perror("print_out_password");
917
1054
exitstatus = EXIT_FAILURE;
924
1061
perror("sigaction");
925
1062
exitstatus = EXIT_FAILURE;
926
1063
}
927
1064
928
1065
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1067
free(*arg);
931
1068
}
932
1069
free(custom_argv);
933
1070
}
934
free_plugin_list(plugin_list);
935
1071
936
1072
if(dir != NULL){
937
1073
closedir(dir);
938
1074
}
939
1075
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1076
/* Kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
948
1085
}
949
free(process_list->buffer);
950
free(process_list);
951
1086
}
952
1087
953
1088
/* Wait for any remaining child processes to terminate */
958
1093
perror("wait");
959
1094
}
960
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
961
1101
return exitstatus;
962
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0