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- Committer: Teddy Hogeborn
- Date: 2008-10-01 15:29:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20081001152901-fh30whl3m4vb7m24
* debian/changelog: New Debian revision.
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
- 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;
115
119
116
120
*new_plugin = (plugin) { .name = copy_name,
117
121
.argc = 1,
118
.envc = 0,
119
122
.disabled = false,
120
.next = *plugin_list };
123
.next = plugin_list };
121
124
122
125
new_plugin->argv = malloc(sizeof(char *) * 2);
123
126
if (new_plugin->argv == NULL){
127
130
}
128
131
new_plugin->argv[0] = copy_name;
129
132
new_plugin->argv[1] = NULL;
130
133
131
134
new_plugin->environ = malloc(sizeof(char *));
132
135
if(new_plugin->environ == NULL){
133
136
free(copy_name);
136
139
return NULL;
137
140
}
138
141
new_plugin->environ[0] = NULL;
142
139
143
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
144
plugin_list = new_plugin;
141
145
return new_plugin;
142
146
}
143
147
173
177
}
174
178
175
179
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
180
static bool add_environment(plugin *p, const char *def, bool replace){
177
181
if(p == NULL){
178
182
return false;
179
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
}
180
201
return add_to_char_array(def, &(p->environ), &(p->envc));
181
202
}
182
203
183
184
204
/*
185
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
206
* Descriptor Flags".
187
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
188
208
*/
189
static int set_cloexec_flag(int fd)
190
{
209
static int set_cloexec_flag(int fd){
191
210
int ret = fcntl(fd, F_GETFD, 0);
192
211
/* If reading the flags failed, return error indication now. */
193
212
if(ret < 0){
197
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
217
}
199
218
200
process *process_list = NULL;
201
219
202
/* Mark a process as completed when it exits, and save its exit
220
/* Mark processes as completed when they exit, and save their exit
203
221
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
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
}
221
250
}
222
251
223
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){
224
254
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
255
for(size_t written = 0; written < length; written += (size_t)ret){
229
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
257
length - written));
235
262
return true;
236
263
}
237
264
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
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
}
244
289
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
290
}
291
292
free(plugin_node);
257
293
}
258
294
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
271
298
}
272
299
}
273
300
274
301
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
302
char *plugindir = NULL;
303
char *argfile = NULL;
277
304
FILE *conffp;
278
305
size_t d_name_len;
279
306
DIR *dir = NULL;
311
338
{ .name = "global-options", .key = 'g',
312
339
.arg = "OPTION[,OPTION[,...]]",
313
340
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
341
{ .name = "global-env", .key = 'G',
315
342
.arg = "VAR=value",
316
343
.doc = "Environment variable passed to all plugins" },
317
344
{ .name = "options-for", .key = 'o',
318
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
346
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
347
{ .name = "env-for", .key = 'E',
321
348
.arg = "PLUGIN:ENV=value",
322
349
.doc = "Environment variable passed to specified plugin" },
323
350
{ .name = "disable", .key = 'd',
324
351
.arg = "PLUGIN",
325
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
326
356
{ .name = "plugin-dir", .key = 128,
327
357
.arg = "DIRECTORY",
328
358
.doc = "Specify a different plugin directory", .group = 2 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.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 },
337
370
{ .name = NULL }
338
371
};
339
372
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
344
375
switch (key) {
345
case 'g':
376
case 'g': /* --global-options */
346
377
if (arg != NULL){
347
378
char *p;
348
379
while((p = strsep(&arg, ",")) != NULL){
349
380
if(p[0] == '\0'){
350
381
continue;
351
382
}
352
if(not add_argument(getplugin(NULL, plugins), p)){
383
if(not add_argument(getplugin(NULL), p)){
353
384
perror("add_argument");
354
385
return ARGP_ERR_UNKNOWN;
355
386
}
356
387
}
357
388
}
358
389
break;
359
case 'e':
390
case 'G': /* --global-env */
360
391
if(arg == NULL){
361
392
break;
362
393
}
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
371
396
}
372
397
break;
373
case 'o':
398
case 'o': /* --options-for */
374
399
if (arg != NULL){
375
400
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
401
if(p_name[0] == '\0' or arg == NULL){
377
402
break;
378
403
}
379
404
char *opt = strsep(&arg, ":");
380
if(opt[0] == '\0'){
405
if(opt[0] == '\0' or opt == NULL){
381
406
break;
382
407
}
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
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;
393
416
}
394
417
}
395
418
}
396
419
break;
397
case 'f':
420
case 'E': /* --env-for */
398
421
if(arg == NULL){
399
422
break;
400
423
}
403
426
if(envdef == NULL){
404
427
break;
405
428
}
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
412
431
perror("add_environment");
413
432
}
414
433
}
415
434
break;
416
case 'd':
435
case 'd': /* --disable */
417
436
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
437
plugin *p = getplugin(arg);
419
438
if(p == NULL){
420
439
return ARGP_ERR_UNKNOWN;
421
440
}
422
441
p->disabled = true;
423
442
}
424
443
break;
425
case 128:
426
plugindir = arg;
427
break;
428
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 */
429
464
uid = (uid_t)strtol(arg, NULL, 10);
430
465
break;
431
case 130:
466
case 131: /* --groupid */
432
467
gid = (gid_t)strtol(arg, NULL, 10);
433
468
break;
434
case 131:
469
case 132: /* --debug */
435
470
debug = true;
436
471
break;
437
472
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.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 = "",
452
524
.doc = "Mandos plugin runner -- Run plugins" };
453
525
454
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);
455
529
if (ret == ARGP_ERR_UNKNOWN){
456
530
fprintf(stderr, "Unknown error while parsing arguments\n");
457
531
exitstatus = EXIT_FAILURE;
458
532
goto fallback;
459
533
}
460
461
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
}
462
544
if(conffp != NULL){
463
545
char *org_line = NULL;
464
546
char *p, *arg, *new_arg, *line;
467
549
const char whitespace_delims[] = " \r\t\f\v\n";
468
550
const char comment_delim[] = "#";
469
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 */
470
564
while(true){
471
565
sret = getline(&org_line, &size, conffp);
472
566
if(sret == -1){
480
574
continue;
481
575
}
482
576
new_arg = strdup(p);
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
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;
489
595
}
490
596
}
491
597
free(org_line);
492
} else{
598
} else {
493
599
/* Check for harmful errors and go to fallback. Other errors might
494
600
not affect opening plugins */
495
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
498
604
goto fallback;
499
605
}
500
606
}
501
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
502
609
if(custom_argv != NULL){
503
custom_argv[0] = argv[0];
504
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);
505
612
if (ret == ARGP_ERR_UNKNOWN){
506
613
fprintf(stderr, "Unknown error while parsing arguments\n");
507
614
exitstatus = EXIT_FAILURE;
509
616
}
510
617
}
511
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
512
628
if(debug){
513
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
514
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
523
639
}
524
640
}
525
641
642
/* Strip permissions down to nobody */
526
643
ret = setuid(uid);
527
644
if (ret == -1){
528
645
perror("setuid");
529
}
530
646
}
531
647
setgid(gid);
532
648
if (ret == -1){
533
649
perror("setgid");
534
650
}
535
651
536
dir = opendir(plugindir);
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
537
658
if(dir == NULL){
538
659
perror("Could not open plugin dir");
539
660
exitstatus = EXIT_FAILURE;
555
676
556
677
FD_ZERO(&rfds_all);
557
678
679
/* Read and execute any executable in the plugin directory*/
558
680
while(true){
559
681
dirst = readdir(dir);
560
682
561
// All directory entries have been processed
683
/* All directory entries have been processed */
562
684
if(dirst == NULL){
563
685
if (errno == EBADF){
564
686
perror("readdir");
570
692
571
693
d_name_len = strlen(dirst->d_name);
572
694
573
// Ignore dotfiles, backup files and other junk
695
/* Ignore dotfiles, backup files and other junk */
574
696
{
575
697
bool bad_name = false;
576
698
591
713
break;
592
714
}
593
715
}
594
595
716
if(bad_name){
596
717
continue;
597
718
}
598
599
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
600
720
size_t suf_len = strlen(*suf);
601
721
if((d_name_len >= suf_len)
616
736
}
617
737
618
738
char *filename;
619
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
}
620
744
if(ret < 0){
621
745
perror("asprintf");
622
746
continue;
628
752
free(filename);
629
753
continue;
630
754
}
631
755
756
/* Ignore non-executable files */
632
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
633
758
if(debug){
634
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
637
762
free(filename);
638
763
continue;
639
764
}
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
765
766
plugin *p = getplugin(dirst->d_name);
641
767
if(p == NULL){
642
768
perror("getplugin");
643
769
free(filename);
653
779
}
654
780
{
655
781
/* Add global arguments to argument list for this plugin */
656
plugin *g = getplugin(NULL, &plugin_list);
782
plugin *g = getplugin(NULL);
657
783
if(g != NULL){
658
784
for(char **a = g->argv + 1; *a != NULL; a++){
659
785
if(not add_argument(p, *a)){
662
788
}
663
789
/* Add global environment variables */
664
790
for(char **e = g->environ; *e != NULL; e++){
665
if(not add_environment(p, *e)){
791
if(not add_environment(p, *e, false)){
666
792
perror("add_environment");
667
793
}
668
794
}
673
799
process, too. */
674
800
if(p->environ[0] != NULL){
675
801
for(char **e = environ; *e != NULL; e++){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
802
if(not add_environment(p, *e, false)){
682
803
perror("add_environment");
683
804
}
684
805
}
691
812
exitstatus = EXIT_FAILURE;
692
813
goto fallback;
693
814
}
815
/* Ask OS to automatic close the pipe on exec */
694
816
ret = set_cloexec_flag(pipefd[0]);
695
817
if(ret < 0){
696
818
perror("set_cloexec_flag");
710
832
exitstatus = EXIT_FAILURE;
711
833
goto fallback;
712
834
}
713
// Starting a new process to be watched
835
/* Starting a new process to be watched */
714
836
pid_t pid = fork();
715
837
if(pid == -1){
716
838
perror("fork");
724
846
perror("sigaction");
725
847
_exit(EXIT_FAILURE);
726
848
}
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
849
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
728
850
if(ret < 0){
729
851
perror("sigprocmask");
730
852
_exit(EXIT_FAILURE);
731
853
}
732
854
733
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
734
856
if(ret == -1){
735
857
perror("dup2");
754
876
}
755
877
/* no return */
756
878
}
757
/* parent process */
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
758
881
free(filename);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
763
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
886
if(ret < 0){
765
perror("sigprocmask");
887
perror("sigprocmask");
766
888
}
767
889
exitstatus = EXIT_FAILURE;
768
890
goto fallback;
769
891
}
770
892
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
776
896
/* Unblock SIGCHLD so signal handler can be run if this process
777
897
has already completed */
778
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
782
902
goto fallback;
783
903
}
784
904
785
FD_SET(new_process->fd, &rfds_all);
905
FD_SET(new_plugin->fd, &rfds_all);
786
906
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
789
909
}
790
791
910
}
792
911
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
912
closedir(dir);
797
913
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
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
}
803
924
}
804
while(process_list){
925
926
/* Main loop while running plugins exist */
927
while(plugin_list){
805
928
fd_set rfds = rfds_all;
806
929
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
930
if (select_ret == -1){
811
934
}
812
935
/* OK, now either a process completed, or something can be read
813
936
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
937
for(plugin *proc = plugin_list; proc != NULL;){
815
938
/* Is this process completely done? */
816
939
if(proc->eof and proc->completed){
817
940
/* Only accept the plugin output if it exited cleanly */
818
941
if(not WIFEXITED(proc->status)
819
942
or WEXITSTATUS(proc->status) != 0){
820
943
/* Bad exit by plugin */
944
821
945
if(debug){
822
946
if(WIFEXITED(proc->status)){
823
947
fprintf(stderr, "Plugin %u exited with status %d\n",
832
956
(unsigned int) (proc->pid));
833
957
}
834
958
}
959
835
960
/* Remove the plugin */
836
961
FD_CLR(proc->fd, &rfds_all);
962
837
963
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
839
965
if(ret < 0){
840
966
perror("sigprocmask");
841
967
exitstatus = EXIT_FAILURE;
842
968
goto fallback;
843
969
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
970
971
plugin *next_plugin = proc->next;
972
free_plugin(proc);
973
proc = next_plugin;
974
857
975
/* We are done modifying process list, so unblock signal */
858
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
977
NULL);
860
978
if(ret < 0){
861
979
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
continue;
869
989
}
990
870
991
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
992
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
873
995
if(not bret){
874
996
perror("print_out_password");
875
997
exitstatus = EXIT_FAILURE;
876
998
}
877
999
goto fallback;
878
1000
}
1001
879
1002
/* This process has not completed. Does it have any output? */
880
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1004
/* This process had nothing to say at this time */
1005
proc = proc->next;
882
1006
continue;
883
1007
}
884
1008
/* Before reading, make the process' data buffer large enough */
897
1021
BUFFER_SIZE);
898
1022
if(ret < 0){
899
1023
/* Read error from this process; ignore the error */
1024
proc = proc->next;
900
1025
continue;
901
1026
}
902
1027
if(ret == 0){
911
1036
912
1037
fallback:
913
1038
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* 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 */
916
1042
bool bret;
917
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1044
char *passwordbuffer = getpass("Password: ");
919
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);
920
1052
if(not bret){
921
1053
perror("print_out_password");
922
1054
exitstatus = EXIT_FAILURE;
929
1061
perror("sigaction");
930
1062
exitstatus = EXIT_FAILURE;
931
1063
}
932
1064
933
1065
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1067
free(*arg);
936
1068
}
937
1069
free(custom_argv);
938
1070
}
939
free_plugin_list(plugin_list);
940
1071
941
1072
if(dir != NULL){
942
1073
closedir(dir);
943
1074
}
944
1075
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
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
}
953
1085
}
954
free(process_list->buffer);
955
free(process_list);
956
1086
}
957
1087
958
1088
/* Wait for any remaining child processes to terminate */
963
1093
perror("wait");
964
1094
}
965
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
966
1101
return exitstatus;
967
1102
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0