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- Committer: Björn Påhlsson
- Date: 2009-02-09 19:34:28 UTC
- mfrom: (309 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090209193428-2u3js3m87ckb84kc
merge
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
67
65
SIG_UNBLOCK, kill(), sig_atomic_t
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
69
76
70
#define BUFFER_SIZE 256
77
71
79
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
74
81
75
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
77
84
78
typedef struct plugin{
85
79
char *name; /* can be NULL or any plugin name */
88
82
char **environ;
89
83
int envc;
90
84
bool disabled;
91
85
92
86
/* Variables used for running processes*/
93
87
pid_t pid;
94
88
int fd;
106
100
/* Gets an existing plugin based on name,
107
101
or if none is found, creates a new one */
108
102
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
103
/* Check for exiting plugin with that name */
110
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
105
if((p->name == name)
112
106
or (p->name and name and (strcmp(p->name, name) == 0))){
114
108
}
115
109
}
116
110
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
111
plugin *new_plugin = malloc(sizeof(plugin));
121
112
if(new_plugin == NULL){
122
113
return NULL;
123
114
}
124
115
char *copy_name = NULL;
125
116
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
129
118
if(copy_name == NULL){
130
int e = errno;
131
119
free(new_plugin);
132
errno = e;
133
120
return NULL;
134
121
}
135
122
}
139
126
.disabled = false,
140
127
.next = plugin_list };
141
128
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
145
130
if(new_plugin->argv == NULL){
146
int e = errno;
147
131
free(copy_name);
148
132
free(new_plugin);
149
errno = e;
150
133
return NULL;
151
134
}
152
135
new_plugin->argv[0] = copy_name;
153
136
new_plugin->argv[1] = NULL;
154
137
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
158
139
if(new_plugin->environ == NULL){
159
int e = errno;
160
140
free(copy_name);
161
141
free(new_plugin->argv);
162
142
free(new_plugin);
163
errno = e;
164
143
return NULL;
165
144
}
166
145
new_plugin->environ[0] = NULL;
171
150
}
172
151
173
152
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
153
static bool add_to_char_array(const char *new, char ***array,
176
154
int *len){
177
155
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
182
158
/* Malloc check */
183
159
if(*array == NULL){
184
160
return false;
185
161
}
186
162
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
191
164
if(copy == NULL){
192
165
return false;
193
166
}
200
173
}
201
174
202
175
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
176
static bool add_argument(plugin *p, const char *arg){
205
177
if(p == NULL){
206
178
return false;
209
181
}
210
182
211
183
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
184
static bool add_environment(plugin *p, const char *def, bool replace){
214
185
if(p == NULL){
215
186
return false;
221
192
if(strncmp(*e, def, namelen + 1) == 0){
222
193
/* It already exists */
223
194
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
195
char *new = realloc(*e, strlen(def) + 1);
228
196
if(new == NULL){
229
197
return false;
230
198
}
240
208
/*
241
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
210
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
212
*/
245
213
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
247
215
/* If reading the flags failed, return error indication now. */
248
216
if(ret < 0){
249
217
return ret;
250
218
}
251
219
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
221
}
255
222
256
223
271
238
/* No child processes */
272
239
break;
273
240
}
274
error(0, errno, "waitpid");
241
perror("waitpid");
275
242
}
276
243
277
244
/* A child exited, find it in process_list */
289
256
}
290
257
291
258
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
259
static bool print_out_password(const char *buffer, size_t length){
294
260
ssize_t ret;
295
261
for(size_t written = 0; written < length; written += (size_t)ret){
303
269
}
304
270
305
271
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
272
static void free_plugin(plugin *plugin_node){
308
273
309
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
280
}
316
281
free(plugin_node->environ);
317
282
free(plugin_node->buffer);
318
283
319
284
/* Removes the plugin from the singly-linked list */
320
285
if(plugin_node == plugin_list){
321
286
/* First one - simple */
348
313
struct dirent *dirst;
349
314
struct stat st;
350
315
fd_set rfds_all;
351
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
352
317
ssize_t sret;
318
intmax_t tmpmax;
353
319
uid_t uid = 65534;
354
320
gid_t gid = 65534;
355
321
bool debug = false;
364
330
sigemptyset(&sigchld_action.sa_mask);
365
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
332
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
369
335
goto fallback;
370
336
}
371
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
338
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
375
341
goto fallback;
376
342
}
377
343
409
375
.doc = "Group ID the plugins will run as", .group = 3 },
410
376
{ .name = "debug", .key = 132,
411
377
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
378
{ .name = NULL }
422
379
};
423
380
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
427
383
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
384
case 'g': /* --global-options */
431
{
385
if(arg != NULL){
432
386
char *plugin_option;
433
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
434
391
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
436
394
}
437
395
}
438
396
}
439
397
break;
440
398
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
442
405
break;
443
406
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
462
417
}
463
418
}
464
419
}
465
420
break;
466
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
467
425
{
468
426
char *envdef = strchr(arg, ':');
469
427
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
428
break;
473
429
}
474
430
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
480
433
}
481
add_environment(getplugin(arg), envdef, true);
482
434
}
483
435
break;
484
436
case 'd': /* --disable */
485
{
437
if(arg != NULL){
486
438
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
489
441
}
442
p->disabled = true;
490
443
}
491
444
break;
492
445
case 'e': /* --enable */
493
{
446
if(arg != NULL){
494
447
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
497
450
}
451
p->disabled = false;
498
452
}
499
453
break;
500
454
case 128: /* --plugin-dir */
501
455
free(plugindir);
502
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
503
460
break;
504
461
case 129: /* --config-file */
505
462
/* This is already done by parse_opt_config_file() */
506
463
break;
507
464
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
514
472
}
515
uid = (uid_t)tmp_id;
516
473
break;
517
474
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
524
482
}
525
gid = (gid_t)tmp_id;
526
483
break;
527
484
case 132: /* --debug */
528
485
debug = true;
529
486
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
487
/*
545
488
* When adding more options before this line, remember to also add a
546
489
* "case" to the "parse_opt_config_file" function below.
549
492
/* Cryptsetup always passes an argument, which is an empty
550
493
string if "none" was specified in /etc/crypttab. So if
551
494
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
555
501
default:
556
502
return ARGP_ERR_UNKNOWN;
557
503
}
558
return errno; /* Set to 0 at start */
504
return 0;
559
505
}
560
506
561
507
/* This option parser is the same as parse_opt() above, except it
563
509
error_t parse_opt_config_file(int key, char *arg,
564
510
__attribute__((unused))
565
511
struct argp_state *state){
566
errno = 0;
567
512
switch(key){
568
513
case 'g': /* --global-options */
569
514
case 'G': /* --global-env */
576
521
case 129: /* --config-file */
577
522
free(argfile);
578
523
argfile = strdup(arg);
579
break;
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
580
528
case 130: /* --userid */
581
529
case 131: /* --groupid */
582
530
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
587
533
break;
588
534
default:
589
535
return ARGP_ERR_UNKNOWN;
590
536
}
591
return errno;
537
return 0;
592
538
}
593
539
594
540
struct argp argp = { .options = options,
598
544
599
545
/* Parse using parse_opt_config_file() in order to get the custom
600
546
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
615
551
goto fallback;
616
552
}
617
553
623
559
conffp = fopen(AFILE, "r");
624
560
} else {
625
561
conffp = fopen(argfile, "r");
626
}
562
}
627
563
if(conffp != NULL){
628
564
char *org_line = NULL;
629
565
char *p, *arg, *new_arg, *line;
630
566
size_t size = 0;
631
567
const char whitespace_delims[] = " \r\t\f\v\n";
632
568
const char comment_delim[] = "#";
633
569
634
570
custom_argc = 1;
635
571
custom_argv = malloc(sizeof(char*) * 2);
636
572
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
639
575
goto fallback;
640
576
}
641
577
custom_argv[0] = argv[0];
642
578
custom_argv[1] = NULL;
643
579
644
580
/* for each line in the config file, strip whitespace and ignore
645
581
commented text */
646
582
while(true){
648
584
if(sret == -1){
649
585
break;
650
586
}
651
587
652
588
line = org_line;
653
589
arg = strsep(&line, comment_delim);
654
590
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
593
}
658
594
new_arg = strdup(p);
659
595
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
662
598
free(org_line);
663
599
goto fallback;
664
600
}
667
603
custom_argv = realloc(custom_argv, sizeof(char *)
668
604
* ((unsigned int) custom_argc + 1));
669
605
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
672
608
free(org_line);
673
609
goto fallback;
674
610
}
675
611
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
612
custom_argv[custom_argc] = NULL;
677
613
}
678
614
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
615
free(org_line);
688
616
} else {
689
617
/* Check for harmful errors and go to fallback. Other errors might
690
618
not affect opening plugins */
691
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
694
622
goto fallback;
695
623
}
696
624
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
699
627
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
714
633
goto fallback;
715
634
}
716
635
}
717
636
718
637
/* Parse actual command line arguments, to let them override the
719
638
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
734
643
goto fallback;
735
644
}
736
645
748
657
}
749
658
}
750
659
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
660
/* Strip permissions down to nobody */
661
setgid(gid);
775
662
if(ret == -1){
776
error(0, errno, "setgid");
663
perror("setgid");
777
664
}
778
665
ret = setuid(uid);
779
666
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
784
683
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
691
}
826
692
}
827
693
}
828
694
830
696
831
697
/* Read and execute any executable in the plugin directory*/
832
698
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
699
dirst = readdir(dir);
836
700
837
701
/* All directory entries have been processed */
838
702
if(dirst == NULL){
839
703
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
842
706
goto fallback;
843
707
}
844
708
break;
874
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
739
size_t suf_len = strlen(*suf);
876
740
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
742
== 0)){
879
743
if(debug){
880
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
753
continue;
890
754
}
891
755
}
892
756
893
757
char *filename;
894
758
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
760
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
762
}
902
763
if(ret < 0){
903
error(0, errno, "asprintf");
764
perror("asprintf");
904
765
continue;
905
766
}
906
767
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
768
ret = stat(filename, &st);
908
769
if(ret == -1){
909
error(0, errno, "stat");
770
perror("stat");
910
771
free(filename);
911
772
continue;
912
773
}
913
774
914
775
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
777
if(debug){
918
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
779
" with bad type or mode\n", filename);
924
784
925
785
plugin *p = getplugin(dirst->d_name);
926
786
if(p == NULL){
927
error(0, errno, "getplugin");
787
perror("getplugin");
928
788
free(filename);
929
789
continue;
930
790
}
942
802
if(g != NULL){
943
803
for(char **a = g->argv + 1; *a != NULL; a++){
944
804
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
805
perror("add_argument");
946
806
}
947
807
}
948
808
/* Add global environment variables */
949
809
for(char **e = g->environ; *e != NULL; e++){
950
810
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
811
perror("add_environment");
952
812
}
953
813
}
954
814
}
959
819
if(p->environ[0] != NULL){
960
820
for(char **e = environ; *e != NULL; e++){
961
821
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
822
perror("add_environment");
963
823
}
964
824
}
965
825
}
966
826
967
827
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
828
ret = pipe(pipefd);
969
829
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
972
832
goto fallback;
973
833
}
974
834
/* Ask OS to automatic close the pipe on exec */
975
835
ret = set_cloexec_flag(pipefd[0]);
976
836
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
979
839
goto fallback;
980
840
}
981
841
ret = set_cloexec_flag(pipefd[1]);
982
842
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
985
845
goto fallback;
986
846
}
987
847
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
849
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
994
852
goto fallback;
995
853
}
996
854
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
855
pid_t pid = fork();
1001
856
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1004
859
goto fallback;
1005
860
}
1006
861
if(pid == 0){
1007
862
/* this is the child process */
1008
863
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
864
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1012
867
}
1013
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
869
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1017
872
}
1018
873
1019
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
875
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1023
878
}
1024
879
1025
880
if(dirfd(dir) < 0){
1029
884
}
1030
885
if(p->environ[0] == NULL){
1031
886
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
887
perror("execv");
888
_exit(EXIT_FAILURE);
1034
889
}
1035
890
} else {
1036
891
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
892
perror("execve");
893
_exit(EXIT_FAILURE);
1039
894
}
1040
895
}
1041
896
/* no return */
1042
897
}
1043
898
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
899
close(pipefd[1]); /* Close unused write end of pipe */
1046
900
free(filename);
1047
901
plugin *new_plugin = getplugin(dirst->d_name);
1048
902
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
905
if(ret < 0){
1054
error(0, errno, "sigprocmask");
906
perror("sigprocmask");
1055
907
}
1056
exitstatus = EX_OSERR;
908
exitstatus = EXIT_FAILURE;
1057
909
goto fallback;
1058
910
}
1059
911
1062
914
1063
915
/* Unblock SIGCHLD so signal handler can be run if this process
1064
916
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
918
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1071
921
goto fallback;
1072
922
}
1073
923
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
924
FD_SET(new_plugin->fd, &rfds_all);
1088
925
1089
926
if(maxfd < new_plugin->fd){
1090
927
maxfd = new_plugin->fd;
1091
928
}
1092
929
}
1093
930
1094
TEMP_FAILURE_RETRY(closedir(dir));
931
closedir(dir);
1095
932
dir = NULL;
1096
933
free_plugin(getplugin(NULL));
1097
934
1110
947
while(plugin_list){
1111
948
fd_set rfds = rfds_all;
1112
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1113
if(select_ret == -1 and errno != EINTR){
1114
error(0, errno, "select");
1115
exitstatus = EX_OSERR;
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1116
953
goto fallback;
1117
954
}
1118
955
/* OK, now either a process completed, or something can be read
1124
961
if(not WIFEXITED(proc->status)
1125
962
or WEXITSTATUS(proc->status) != 0){
1126
963
/* Bad exit by plugin */
1127
964
1128
965
if(debug){
1129
966
if(WIFEXITED(proc->status)){
1130
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
970
WEXITSTATUS(proc->status));
1134
971
} else if(WIFSIGNALED(proc->status)){
1135
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1136
" signal %d: %s\n", proc->name,
973
" signal %d\n", proc->name,
1137
974
(intmax_t) (proc->pid),
1138
WTERMSIG(proc->status),
1139
strsignal(WTERMSIG(proc->status)));
975
WTERMSIG(proc->status));
1140
976
} else if(WCOREDUMP(proc->status)){
1141
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1142
978
" core\n", proc->name, (intmax_t) (proc->pid));
1144
980
}
1145
981
1146
982
/* Remove the plugin */
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1151
#endif
1152
#endif
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1155
before 2.16 */
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1159
#endif
1160
#endif
1161
983
FD_CLR(proc->fd, &rfds_all);
984
1162
985
/* Block signal while modifying process_list */
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1164
(SIG_BLOCK,
1165
&sigchld_action.sa_mask,
1166
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1167
987
if(ret < 0){
1168
error(0, errno, "sigprocmask");
1169
exitstatus = EX_OSERR;
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1170
990
goto fallback;
1171
991
}
1172
992
1175
995
proc = next_plugin;
1176
996
1177
997
/* We are done modifying process list, so unblock signal */
1178
ret = (int)(TEMP_FAILURE_RETRY
1179
(sigprocmask(SIG_UNBLOCK,
1180
&sigchld_action.sa_mask, NULL)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1181
1000
if(ret < 0){
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1184
1003
goto fallback;
1185
1004
}
1186
1005
1196
1015
bool bret = print_out_password(proc->buffer,
1197
1016
proc->buffer_length);
1198
1017
if(not bret){
1199
error(0, errno, "print_out_password");
1200
exitstatus = EX_IOERR;
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1201
1020
}
1202
1021
goto fallback;
1203
1022
}
1204
1023
1205
1024
/* This process has not completed. Does it have any output? */
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1210
#endif
1211
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1213
warning from
1214
-Wconversion
1215
in GNU libc
1216
before
1217
2.16 */
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1221
#endif
1222
#endif
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1223
1026
/* This process had nothing to say at this time */
1224
1027
proc = proc->next;
1225
1028
continue;
1229
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1230
1033
+ (size_t) BUFFER_SIZE);
1231
1034
if(proc->buffer == NULL){
1232
error(0, errno, "malloc");
1233
exitstatus = EX_OSERR;
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1234
1037
goto fallback;
1235
1038
}
1236
1039
proc->buffer_size += BUFFER_SIZE;
1237
1040
}
1238
1041
/* Read from the process */
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1243
1044
if(sret < 0){
1244
1045
/* Read error from this process; ignore the error */
1245
1046
proc = proc->next;
1253
1054
}
1254
1055
}
1255
1056
}
1256
1257
1057
1058
1258
1059
fallback:
1259
1060
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1262
1062
/* Fallback if all plugins failed, none are found or an error
1263
1063
occured */
1264
1064
bool bret;
1272
1072
}
1273
1073
bret = print_out_password(passwordbuffer, len);
1274
1074
if(not bret){
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1277
1077
}
1278
1078
}
1279
1079
1280
1080
/* Restore old signal handler */
1281
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
1082
if(ret == -1){
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1285
1085
}
1286
1086
1287
1087
if(custom_argv != NULL){
1302
1102
ret = kill(p->pid, SIGTERM);
1303
1103
if(ret == -1 and errno != ESRCH){
1304
1104
/* Set-uid proccesses might not get closed */
1305
error(0, errno, "kill");
1105
perror("kill");
1306
1106
}
1307
1107
}
1308
1108
}
1309
1109
1310
1110
/* Wait for any remaining child processes to terminate */
1311
do {
1111
do{
1312
1112
ret = wait(NULL);
1313
1113
} while(ret >= 0);
1314
1114
if(errno != ECHILD){
1315
error(0, errno, "wait");
1115
perror("wait");
1316
1116
}
1317
1117
1318
1118
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0