To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 532
- compare with another revision
- download diff
- download tarball
- view history from revision 532
- Committer: teddy at bsnet
- Date: 2011-12-24 23:07:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20111224230717-yd3c0532w0kaviuc
* plugins.d/mandos-client.c (fprintf_plus): Check format string.
(run_network_hooks): Check for execl() failure.
(run_network_hooks): Check for execl() failure.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), 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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
65
67
SIG_UNBLOCK, kill(), sig_atomic_t
66
68
*/
67
69
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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() */
69
75
70
76
#define BUFFER_SIZE 256
71
77
73
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
80
75
81
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
83
78
84
typedef struct plugin{
79
85
char *name; /* can be NULL or any plugin name */
82
88
char **environ;
83
89
int envc;
84
90
bool disabled;
85
91
86
92
/* Variables used for running processes*/
87
93
pid_t pid;
88
94
int fd;
100
106
/* Gets an existing plugin based on name,
101
107
or if none is found, creates a new one */
102
108
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
104
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
111
if((p->name == name)
106
112
or (p->name and name and (strcmp(p->name, name) == 0))){
108
114
}
109
115
}
110
116
/* Create a new plugin */
111
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
112
121
if(new_plugin == NULL){
113
122
return NULL;
114
123
}
115
124
char *copy_name = NULL;
116
125
if(name != NULL){
117
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
118
129
if(copy_name == NULL){
130
int e = errno;
119
131
free(new_plugin);
132
errno = e;
120
133
return NULL;
121
134
}
122
135
}
126
139
.disabled = false,
127
140
.next = plugin_list };
128
141
129
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
130
145
if(new_plugin->argv == NULL){
146
int e = errno;
131
147
free(copy_name);
132
148
free(new_plugin);
149
errno = e;
133
150
return NULL;
134
151
}
135
152
new_plugin->argv[0] = copy_name;
136
153
new_plugin->argv[1] = NULL;
137
154
138
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
139
158
if(new_plugin->environ == NULL){
159
int e = errno;
140
160
free(copy_name);
141
161
free(new_plugin->argv);
142
162
free(new_plugin);
163
errno = e;
143
164
return NULL;
144
165
}
145
166
new_plugin->environ[0] = NULL;
153
174
static bool add_to_char_array(const char *new, char ***array,
154
175
int *len){
155
176
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
158
181
/* Malloc check */
159
182
if(*array == NULL){
160
183
return false;
161
184
}
162
185
/* Make a copy of the new string */
163
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
164
190
if(copy == NULL){
165
191
return false;
166
192
}
192
218
if(strncmp(*e, def, namelen + 1) == 0){
193
219
/* It already exists */
194
220
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
196
225
if(new == NULL){
197
226
return false;
198
227
}
208
237
/*
209
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
239
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
241
*/
213
242
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
244
/* If reading the flags failed, return error indication now. */
216
245
if(ret < 0){
217
246
return ret;
218
247
}
219
248
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
221
251
}
222
252
223
253
238
268
/* No child processes */
239
269
break;
240
270
}
241
perror("waitpid");
271
error(0, errno, "waitpid");
242
272
}
243
273
244
274
/* A child exited, find it in process_list */
280
310
}
281
311
free(plugin_node->environ);
282
312
free(plugin_node->buffer);
283
313
284
314
/* Removes the plugin from the singly-linked list */
285
315
if(plugin_node == plugin_list){
286
316
/* First one - simple */
313
343
struct dirent *dirst;
314
344
struct stat st;
315
345
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
346
int ret, maxfd = 0;
317
347
ssize_t sret;
318
intmax_t tmpmax;
319
348
uid_t uid = 65534;
320
349
gid_t gid = 65534;
321
350
bool debug = false;
330
359
sigemptyset(&sigchld_action.sa_mask);
331
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
361
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
335
364
goto fallback;
336
365
}
337
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
367
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
341
370
goto fallback;
342
371
}
343
372
375
404
.doc = "Group ID the plugins will run as", .group = 3 },
376
405
{ .name = "debug", .key = 132,
377
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
378
416
{ .name = NULL }
379
417
};
380
418
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
383
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
384
424
case 'g': /* --global-options */
385
if(arg != NULL){
425
{
386
426
char *plugin_option;
387
427
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
428
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
429
break;
394
430
}
395
431
}
396
432
}
397
433
break;
398
434
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
435
add_environment(getplugin(NULL), arg, true);
405
436
break;
406
437
case 'o': /* --options-for */
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;
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
417
456
}
418
457
}
419
458
}
420
459
break;
421
460
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
461
{
426
462
char *envdef = strchr(arg, ':');
427
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
428
466
break;
429
467
}
430
468
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
433
474
}
475
add_environment(getplugin(arg), envdef, true);
434
476
}
435
477
break;
436
478
case 'd': /* --disable */
437
if(arg != NULL){
479
{
438
480
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
441
483
}
442
p->disabled = true;
443
484
}
444
485
break;
445
486
case 'e': /* --enable */
446
if(arg != NULL){
487
{
447
488
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
450
491
}
451
p->disabled = false;
452
492
}
453
493
break;
454
494
case 128: /* --plugin-dir */
455
495
free(plugindir);
456
496
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
497
break;
461
498
case 129: /* --config-file */
462
499
/* This is already done by parse_opt_config_file() */
463
500
break;
464
501
case 130: /* --userid */
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;
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
472
508
}
509
uid = (uid_t)tmpmax;
473
510
break;
474
511
case 131: /* --groupid */
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;
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
482
518
}
519
gid = (gid_t)tmpmax;
483
520
break;
484
521
case 132: /* --debug */
485
522
debug = true;
486
523
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
487
538
/*
488
539
* When adding more options before this line, remember to also add a
489
540
* "case" to the "parse_opt_config_file" function below.
492
543
/* Cryptsetup always passes an argument, which is an empty
493
544
string if "none" was specified in /etc/crypttab. So if
494
545
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
497
548
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
549
default:
502
550
return ARGP_ERR_UNKNOWN;
503
551
}
504
return 0;
552
return errno; /* Set to 0 at start */
505
553
}
506
554
507
555
/* This option parser is the same as parse_opt() above, except it
509
557
error_t parse_opt_config_file(int key, char *arg,
510
558
__attribute__((unused))
511
559
struct argp_state *state){
560
errno = 0;
512
561
switch(key){
513
562
case 'g': /* --global-options */
514
563
case 'G': /* --global-env */
521
570
case 129: /* --config-file */
522
571
free(argfile);
523
572
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
573
break;
528
574
case 130: /* --userid */
529
575
case 131: /* --groupid */
530
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
531
580
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
581
break;
534
582
default:
535
583
return ARGP_ERR_UNKNOWN;
536
584
}
537
return 0;
585
return errno;
538
586
}
539
587
540
588
struct argp argp = { .options = options,
544
592
545
593
/* Parse using parse_opt_config_file() in order to get the custom
546
594
config file location, if any. */
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;
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
551
609
goto fallback;
552
610
}
553
611
559
617
conffp = fopen(AFILE, "r");
560
618
} else {
561
619
conffp = fopen(argfile, "r");
562
}
620
}
563
621
if(conffp != NULL){
564
622
char *org_line = NULL;
565
623
char *p, *arg, *new_arg, *line;
566
624
size_t size = 0;
567
625
const char whitespace_delims[] = " \r\t\f\v\n";
568
626
const char comment_delim[] = "#";
569
627
570
628
custom_argc = 1;
571
629
custom_argv = malloc(sizeof(char*) * 2);
572
630
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
575
633
goto fallback;
576
634
}
577
635
custom_argv[0] = argv[0];
578
636
custom_argv[1] = NULL;
579
637
580
638
/* for each line in the config file, strip whitespace and ignore
581
639
commented text */
582
640
while(true){
584
642
if(sret == -1){
585
643
break;
586
644
}
587
645
588
646
line = org_line;
589
647
arg = strsep(&line, comment_delim);
590
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
651
}
594
652
new_arg = strdup(p);
595
653
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
598
656
free(org_line);
599
657
goto fallback;
600
658
}
603
661
custom_argv = realloc(custom_argv, sizeof(char *)
604
662
* ((unsigned int) custom_argc + 1));
605
663
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
608
666
free(org_line);
609
667
goto fallback;
610
668
}
611
669
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
613
671
}
614
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
615
681
free(org_line);
616
682
} else {
617
683
/* Check for harmful errors and go to fallback. Other errors might
618
684
not affect opening plugins */
619
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
622
688
goto fallback;
623
689
}
624
690
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
627
693
if(custom_argv != NULL){
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;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
633
708
goto fallback;
634
709
}
635
710
}
636
711
637
712
/* Parse actual command line arguments, to let them override the
638
713
config file */
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;
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
643
728
goto fallback;
644
729
}
645
730
657
742
}
658
743
}
659
744
660
/* Strip permissions down to nobody */
745
if(getuid() == 0){
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
661
768
setgid(gid);
662
769
if(ret == -1){
663
perror("setgid");
770
error(0, errno, "setgid");
664
771
}
665
772
ret = setuid(uid);
666
773
if(ret == -1){
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 */
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
683
778
{
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
}
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
692
820
}
693
821
}
694
822
696
824
697
825
/* Read and execute any executable in the plugin directory*/
698
826
while(true){
699
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
700
830
701
831
/* All directory entries have been processed */
702
832
if(dirst == NULL){
703
833
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
706
836
goto fallback;
707
837
}
708
838
break;
738
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
869
size_t suf_len = strlen(*suf);
740
870
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
742
872
== 0)){
743
873
if(debug){
744
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
753
883
continue;
754
884
}
755
885
}
756
886
757
887
char *filename;
758
888
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
760
891
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
762
895
}
763
896
if(ret < 0){
764
perror("asprintf");
897
error(0, errno, "asprintf");
765
898
continue;
766
899
}
767
900
768
ret = stat(filename, &st);
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
769
902
if(ret == -1){
770
perror("stat");
903
error(0, errno, "stat");
771
904
free(filename);
772
905
continue;
773
906
}
774
907
775
908
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
777
911
if(debug){
778
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
913
" with bad type or mode\n", filename);
784
918
785
919
plugin *p = getplugin(dirst->d_name);
786
920
if(p == NULL){
787
perror("getplugin");
921
error(0, errno, "getplugin");
788
922
free(filename);
789
923
continue;
790
924
}
802
936
if(g != NULL){
803
937
for(char **a = g->argv + 1; *a != NULL; a++){
804
938
if(not add_argument(p, *a)){
805
perror("add_argument");
939
error(0, errno, "add_argument");
806
940
}
807
941
}
808
942
/* Add global environment variables */
809
943
for(char **e = g->environ; *e != NULL; e++){
810
944
if(not add_environment(p, *e, false)){
811
perror("add_environment");
945
error(0, errno, "add_environment");
812
946
}
813
947
}
814
948
}
819
953
if(p->environ[0] != NULL){
820
954
for(char **e = environ; *e != NULL; e++){
821
955
if(not add_environment(p, *e, false)){
822
perror("add_environment");
956
error(0, errno, "add_environment");
823
957
}
824
958
}
825
959
}
826
960
827
961
int pipefd[2];
828
ret = pipe(pipefd);
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
829
963
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
832
966
goto fallback;
833
967
}
834
968
/* Ask OS to automatic close the pipe on exec */
835
969
ret = set_cloexec_flag(pipefd[0]);
836
970
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
839
973
goto fallback;
840
974
}
841
975
ret = set_cloexec_flag(pipefd[1]);
842
976
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
845
979
goto fallback;
846
980
}
847
981
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
849
985
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
852
988
goto fallback;
853
989
}
854
990
/* Starting a new process to be watched */
855
pid_t pid = fork();
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
856
995
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
859
998
goto fallback;
860
999
}
861
1000
if(pid == 0){
862
1001
/* this is the child process */
863
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1003
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
867
1006
}
868
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1008
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
872
1011
}
873
1012
874
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1014
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
878
1017
}
879
1018
880
1019
if(dirfd(dir) < 0){
884
1023
}
885
1024
if(p->environ[0] == NULL){
886
1025
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
889
1028
}
890
1029
} else {
891
1030
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
894
1033
}
895
1034
}
896
1035
/* no return */
897
1036
}
898
1037
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
900
1040
free(filename);
901
1041
plugin *new_plugin = getplugin(dirst->d_name);
902
1042
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
905
1047
if(ret < 0){
906
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
907
1049
}
908
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
909
1051
goto fallback;
910
1052
}
911
1053
914
1056
915
1057
/* Unblock SIGCHLD so signal handler can be run if this process
916
1058
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
918
1062
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
921
1065
goto fallback;
922
1066
}
923
1067
924
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
925
1070
926
1071
if(maxfd < new_plugin->fd){
927
1072
maxfd = new_plugin->fd;
928
1073
}
929
1074
}
930
1075
931
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
932
1077
dir = NULL;
933
1078
free_plugin(getplugin(NULL));
934
1079
947
1092
while(plugin_list){
948
1093
fd_set rfds = rfds_all;
949
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
953
1098
goto fallback;
954
1099
}
955
1100
/* OK, now either a process completed, or something can be read
961
1106
if(not WIFEXITED(proc->status)
962
1107
or WEXITSTATUS(proc->status) != 0){
963
1108
/* Bad exit by plugin */
964
1109
965
1110
if(debug){
966
1111
if(WIFEXITED(proc->status)){
967
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1115
WEXITSTATUS(proc->status));
971
1116
} else if(WIFSIGNALED(proc->status)){
972
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1118
" signal %d: %s\n", proc->name,
974
1119
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
976
1122
} else if(WCOREDUMP(proc->status)){
977
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
1124
" core\n", proc->name, (intmax_t) (proc->pid));
980
1126
}
981
1127
982
1128
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
985
1132
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
987
1137
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
990
1140
goto fallback;
991
1141
}
992
1142
995
1145
proc = next_plugin;
996
1146
997
1147
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1000
1151
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1003
1154
goto fallback;
1004
1155
}
1005
1156
1015
1166
bool bret = print_out_password(proc->buffer,
1016
1167
proc->buffer_length);
1017
1168
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1020
1171
}
1021
1172
goto fallback;
1022
1173
}
1023
1174
1024
1175
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1026
1179
/* This process had nothing to say at this time */
1027
1180
proc = proc->next;
1028
1181
continue;
1032
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
1186
+ (size_t) BUFFER_SIZE);
1034
1187
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1037
1190
goto fallback;
1038
1191
}
1039
1192
proc->buffer_size += BUFFER_SIZE;
1040
1193
}
1041
1194
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1044
1199
if(sret < 0){
1045
1200
/* Read error from this process; ignore the error */
1046
1201
proc = proc->next;
1054
1209
}
1055
1210
}
1056
1211
}
1057
1058
1212
1213
1059
1214
fallback:
1060
1215
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1062
1218
/* Fallback if all plugins failed, none are found or an error
1063
1219
occured */
1064
1220
bool bret;
1072
1228
}
1073
1229
bret = print_out_password(passwordbuffer, len);
1074
1230
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1077
1233
}
1078
1234
}
1079
1235
1080
1236
/* Restore old signal handler */
1081
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1238
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1085
1241
}
1086
1242
1087
1243
if(custom_argv != NULL){
1102
1258
ret = kill(p->pid, SIGTERM);
1103
1259
if(ret == -1 and errno != ESRCH){
1104
1260
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1261
error(0, errno, "kill");
1106
1262
}
1107
1263
}
1108
1264
}
1109
1265
1110
1266
/* Wait for any remaining child processes to terminate */
1111
do{
1267
do {
1112
1268
ret = wait(NULL);
1113
1269
} while(ret >= 0);
1114
1270
if(errno != ECHILD){
1115
perror("wait");
1271
error(0, errno, "wait");
1116
1272
}
1117
1273
1118
1274
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0