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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:13:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20090209021358-6nrlc91oi08hn5hb
* initramfs-tools-hook: Whitespace change only.
- files removed:
- dbus-mandos.conf
- files modified:
- INSTALL
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
*
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
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() */
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,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
73
68
74
69
#define BUFFER_SIZE 256
75
70
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
104
99
/* Gets an existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
108
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
104
if((p->name == name)
110
105
or (p->name and name and (strcmp(p->name, name) == 0))){
112
107
}
113
108
}
114
109
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
119
111
if(new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
118
free(new_plugin);
130
errno = e;
131
119
return NULL;
132
120
}
133
121
}
137
125
.disabled = false,
138
126
.next = plugin_list };
139
127
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
143
129
if(new_plugin->argv == NULL){
144
int e = errno;
145
130
free(copy_name);
146
131
free(new_plugin);
147
errno = e;
148
132
return NULL;
149
133
}
150
134
new_plugin->argv[0] = copy_name;
151
135
new_plugin->argv[1] = NULL;
152
136
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
156
138
if(new_plugin->environ == NULL){
157
int e = errno;
158
139
free(copy_name);
159
140
free(new_plugin->argv);
160
141
free(new_plugin);
161
errno = e;
162
142
return NULL;
163
143
}
164
144
new_plugin->environ[0] = NULL;
172
152
static bool add_to_char_array(const char *new, char ***array,
173
153
int *len){
174
154
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
179
157
/* Malloc check */
180
158
if(*array == NULL){
181
159
return false;
182
160
}
183
161
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
188
163
if(copy == NULL){
189
164
return false;
190
165
}
216
191
if(strncmp(*e, def, namelen + 1) == 0){
217
192
/* It already exists */
218
193
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
223
195
if(new == NULL){
224
196
return false;
225
197
}
235
207
/*
236
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
209
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
211
*/
240
212
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
242
214
/* If reading the flags failed, return error indication now. */
243
215
if(ret < 0){
244
216
return ret;
245
217
}
246
218
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
220
}
250
221
251
222
308
279
}
309
280
free(plugin_node->environ);
310
281
free(plugin_node->buffer);
311
282
312
283
/* Removes the plugin from the singly-linked list */
313
284
if(plugin_node == plugin_list){
314
285
/* First one - simple */
341
312
struct dirent *dirst;
342
313
struct stat st;
343
314
fd_set rfds_all;
344
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
345
316
ssize_t sret;
317
intmax_t tmpmax;
346
318
uid_t uid = 65534;
347
319
gid_t gid = 65534;
348
320
bool debug = false;
358
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
331
if(ret == -1){
360
332
perror("sigaddset");
361
exitstatus = EX_OSERR;
333
exitstatus = EXIT_FAILURE;
362
334
goto fallback;
363
335
}
364
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
337
if(ret == -1){
366
338
perror("sigaction");
367
exitstatus = EX_OSERR;
339
exitstatus = EXIT_FAILURE;
368
340
goto fallback;
369
341
}
370
342
402
374
.doc = "Group ID the plugins will run as", .group = 3 },
403
375
{ .name = "debug", .key = 132,
404
376
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
414
377
{ .name = NULL }
415
378
};
416
379
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
419
382
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
383
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
428
393
}
429
394
}
430
395
}
431
396
break;
432
397
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
434
404
break;
435
405
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
454
423
}
455
424
}
456
425
}
457
426
break;
458
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
459
431
{
460
432
char *envdef = strchr(arg, ':');
461
433
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
434
break;
465
435
}
466
436
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
472
439
}
473
add_environment(getplugin(arg), envdef, true);
474
440
}
475
441
break;
476
442
case 'd': /* --disable */
477
{
443
if(arg != NULL){
478
444
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
481
447
}
448
p->disabled = true;
482
449
}
483
450
break;
484
451
case 'e': /* --enable */
485
{
452
if(arg != NULL){
486
453
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
489
456
}
457
p->disabled = false;
490
458
}
491
459
break;
492
460
case 128: /* --plugin-dir */
493
461
free(plugindir);
494
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
495
466
break;
496
467
case 129: /* --config-file */
497
468
/* This is already done by parse_opt_config_file() */
498
469
break;
499
470
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
506
478
}
507
uid = (uid_t)tmpmax;
508
479
break;
509
480
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
516
488
}
517
gid = (gid_t)tmpmax;
518
489
break;
519
490
case 132: /* --debug */
520
491
debug = true;
521
492
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
493
/*
537
494
* When adding more options before this line, remember to also add a
538
495
* "case" to the "parse_opt_config_file" function below.
541
498
/* Cryptsetup always passes an argument, which is an empty
542
499
string if "none" was specified in /etc/crypttab. So if
543
500
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
547
507
default:
548
508
return ARGP_ERR_UNKNOWN;
549
509
}
550
return errno; /* Set to 0 at start */
510
return 0;
551
511
}
552
512
553
513
/* This option parser is the same as parse_opt() above, except it
555
515
error_t parse_opt_config_file(int key, char *arg,
556
516
__attribute__((unused))
557
517
struct argp_state *state){
558
errno = 0;
559
518
switch(key){
560
519
case 'g': /* --global-options */
561
520
case 'G': /* --global-env */
568
527
case 129: /* --config-file */
569
528
free(argfile);
570
529
argfile = strdup(arg);
571
break;
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
572
534
case 130: /* --userid */
573
535
case 131: /* --groupid */
574
536
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
579
539
break;
580
540
default:
581
541
return ARGP_ERR_UNKNOWN;
582
542
}
583
return errno;
543
return 0;
584
544
}
585
545
586
546
struct argp argp = { .options = options,
590
550
591
551
/* Parse using parse_opt_config_file() in order to get the custom
592
552
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
607
557
goto fallback;
608
558
}
609
559
615
565
conffp = fopen(AFILE, "r");
616
566
} else {
617
567
conffp = fopen(argfile, "r");
618
}
568
}
619
569
if(conffp != NULL){
620
570
char *org_line = NULL;
621
571
char *p, *arg, *new_arg, *line;
622
572
size_t size = 0;
623
573
const char whitespace_delims[] = " \r\t\f\v\n";
624
574
const char comment_delim[] = "#";
625
575
626
576
custom_argc = 1;
627
577
custom_argv = malloc(sizeof(char*) * 2);
628
578
if(custom_argv == NULL){
629
579
perror("malloc");
630
exitstatus = EX_OSERR;
580
exitstatus = EXIT_FAILURE;
631
581
goto fallback;
632
582
}
633
583
custom_argv[0] = argv[0];
634
584
custom_argv[1] = NULL;
635
585
636
586
/* for each line in the config file, strip whitespace and ignore
637
587
commented text */
638
588
while(true){
640
590
if(sret == -1){
641
591
break;
642
592
}
643
593
644
594
line = org_line;
645
595
arg = strsep(&line, comment_delim);
646
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
600
new_arg = strdup(p);
651
601
if(new_arg == NULL){
652
602
perror("strdup");
653
exitstatus = EX_OSERR;
603
exitstatus = EXIT_FAILURE;
654
604
free(org_line);
655
605
goto fallback;
656
606
}
660
610
* ((unsigned int) custom_argc + 1));
661
611
if(custom_argv == NULL){
662
612
perror("realloc");
663
exitstatus = EX_OSERR;
613
exitstatus = EXIT_FAILURE;
664
614
free(org_line);
665
615
goto fallback;
666
616
}
667
617
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
669
619
}
670
620
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
621
free(org_line);
680
622
} else {
681
623
/* Check for harmful errors and go to fallback. Other errors might
682
624
not affect opening plugins */
683
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
626
perror("fopen");
685
exitstatus = EX_OSERR;
627
exitstatus = EXIT_FAILURE;
686
628
goto fallback;
687
629
}
688
630
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
691
633
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
706
639
goto fallback;
707
640
}
708
641
}
709
642
710
643
/* Parse actual command line arguments, to let them override the
711
644
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
726
649
goto fallback;
727
650
}
728
651
750
673
perror("setuid");
751
674
}
752
675
753
/* Open plugin directory with close_on_exec flag */
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
689
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
697
}
796
698
}
797
699
}
798
700
800
702
801
703
/* Read and execute any executable in the plugin directory*/
802
704
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
705
dirst = readdir(dir);
806
706
807
707
/* All directory entries have been processed */
808
708
if(dirst == NULL){
809
709
if(errno == EBADF){
810
710
perror("readdir");
811
exitstatus = EX_IOERR;
711
exitstatus = EXIT_FAILURE;
812
712
goto fallback;
813
713
}
814
714
break;
859
759
continue;
860
760
}
861
761
}
862
762
863
763
char *filename;
864
764
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
766
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
768
}
872
769
if(ret < 0){
873
770
perror("asprintf");
874
771
continue;
875
772
}
876
773
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
ret = stat(filename, &st);
878
775
if(ret == -1){
879
776
perror("stat");
880
777
free(filename);
881
778
continue;
882
779
}
883
780
884
781
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
783
if(debug){
888
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
785
" with bad type or mode\n", filename);
935
831
}
936
832
937
833
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
834
ret = pipe(pipefd);
939
835
if(ret == -1){
940
836
perror("pipe");
941
exitstatus = EX_OSERR;
837
exitstatus = EXIT_FAILURE;
942
838
goto fallback;
943
839
}
944
840
/* Ask OS to automatic close the pipe on exec */
945
841
ret = set_cloexec_flag(pipefd[0]);
946
842
if(ret < 0){
947
843
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
844
exitstatus = EXIT_FAILURE;
949
845
goto fallback;
950
846
}
951
847
ret = set_cloexec_flag(pipefd[1]);
952
848
if(ret < 0){
953
849
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
850
exitstatus = EXIT_FAILURE;
955
851
goto fallback;
956
852
}
957
853
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
855
if(ret < 0){
962
856
perror("sigprocmask");
963
exitstatus = EX_OSERR;
857
exitstatus = EXIT_FAILURE;
964
858
goto fallback;
965
859
}
966
860
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
971
862
if(pid == -1){
972
863
perror("fork");
973
exitstatus = EX_OSERR;
864
exitstatus = EXIT_FAILURE;
974
865
goto fallback;
975
866
}
976
867
if(pid == 0){
978
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
870
if(ret < 0){
980
871
perror("sigaction");
981
_exit(EX_OSERR);
872
_exit(EXIT_FAILURE);
982
873
}
983
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
875
if(ret < 0){
985
876
perror("sigprocmask");
986
_exit(EX_OSERR);
877
_exit(EXIT_FAILURE);
987
878
}
988
879
989
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
881
if(ret == -1){
991
882
perror("dup2");
992
_exit(EX_OSERR);
883
_exit(EXIT_FAILURE);
993
884
}
994
885
995
886
if(dirfd(dir) < 0){
1000
891
if(p->environ[0] == NULL){
1001
892
if(execv(filename, p->argv) < 0){
1002
893
perror("execv");
1003
_exit(EX_OSERR);
894
_exit(EXIT_FAILURE);
1004
895
}
1005
896
} else {
1006
897
if(execve(filename, p->argv, p->environ) < 0){
1007
898
perror("execve");
1008
_exit(EX_OSERR);
899
_exit(EXIT_FAILURE);
1009
900
}
1010
901
}
1011
902
/* no return */
1012
903
}
1013
904
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
905
close(pipefd[1]); /* Close unused write end of pipe */
1016
906
free(filename);
1017
907
plugin *new_plugin = getplugin(dirst->d_name);
1018
908
if(new_plugin == NULL){
1019
909
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
911
if(ret < 0){
1024
912
perror("sigprocmask");
1025
913
}
1026
exitstatus = EX_OSERR;
914
exitstatus = EXIT_FAILURE;
1027
915
goto fallback;
1028
916
}
1029
917
1032
920
1033
921
/* Unblock SIGCHLD so signal handler can be run if this process
1034
922
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
924
if(ret < 0){
1039
925
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
926
exitstatus = EXIT_FAILURE;
1041
927
goto fallback;
1042
928
}
1043
929
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
930
FD_SET(new_plugin->fd, &rfds_all);
1046
931
1047
932
if(maxfd < new_plugin->fd){
1048
933
maxfd = new_plugin->fd;
1049
934
}
1050
935
}
1051
936
1052
TEMP_FAILURE_RETRY(closedir(dir));
937
closedir(dir);
1053
938
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
939
1056
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
941
if(p->pid != 0){
1068
952
while(plugin_list){
1069
953
fd_set rfds = rfds_all;
1070
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
955
if(select_ret == -1){
1072
956
perror("select");
1073
exitstatus = EX_OSERR;
957
exitstatus = EXIT_FAILURE;
1074
958
goto fallback;
1075
959
}
1076
960
/* OK, now either a process completed, or something can be read
1082
966
if(not WIFEXITED(proc->status)
1083
967
or WEXITSTATUS(proc->status) != 0){
1084
968
/* Bad exit by plugin */
1085
969
1086
970
if(debug){
1087
971
if(WIFEXITED(proc->status)){
1088
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
975
WEXITSTATUS(proc->status));
1092
976
} else if(WIFSIGNALED(proc->status)){
1093
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
978
" signal %d\n", proc->name,
1095
979
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
980
WTERMSIG(proc->status));
1098
981
} else if(WCOREDUMP(proc->status)){
1099
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
983
" core\n", proc->name, (intmax_t) (proc->pid));
1102
985
}
1103
986
1104
987
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
988
FD_CLR(proc->fd, &rfds_all);
989
1108
990
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
992
if(ret < 0){
1114
993
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
994
exitstatus = EXIT_FAILURE;
1116
995
goto fallback;
1117
996
}
1118
997
1121
1000
proc = next_plugin;
1122
1001
1123
1002
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1127
1005
if(ret < 0){
1128
1006
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1007
exitstatus = EXIT_FAILURE;
1130
1008
goto fallback;
1131
1009
}
1132
1010
1143
1021
proc->buffer_length);
1144
1022
if(not bret){
1145
1023
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1024
exitstatus = EXIT_FAILURE;
1147
1025
}
1148
1026
goto fallback;
1149
1027
}
1150
1028
1151
1029
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1030
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1031
/* This process had nothing to say at this time */
1156
1032
proc = proc->next;
1157
1033
continue;
1162
1038
+ (size_t) BUFFER_SIZE);
1163
1039
if(proc->buffer == NULL){
1164
1040
perror("malloc");
1165
exitstatus = EX_OSERR;
1041
exitstatus = EXIT_FAILURE;
1166
1042
goto fallback;
1167
1043
}
1168
1044
proc->buffer_size += BUFFER_SIZE;
1169
1045
}
1170
1046
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1175
1049
if(sret < 0){
1176
1050
/* Read error from this process; ignore the error */
1177
1051
proc = proc->next;
1185
1059
}
1186
1060
}
1187
1061
}
1188
1189
1062
1063
1190
1064
fallback:
1191
1065
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1067
/* Fallback if all plugins failed, none are found or an error
1195
1068
occured */
1196
1069
bool bret;
1205
1078
bret = print_out_password(passwordbuffer, len);
1206
1079
if(not bret){
1207
1080
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1081
exitstatus = EXIT_FAILURE;
1209
1082
}
1210
1083
}
1211
1084
1213
1086
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1087
if(ret == -1){
1215
1088
perror("sigaction");
1216
exitstatus = EX_OSERR;
1089
exitstatus = EXIT_FAILURE;
1217
1090
}
1218
1091
1219
1092
if(custom_argv != NULL){
1240
1113
}
1241
1114
1242
1115
/* Wait for any remaining child processes to terminate */
1243
do {
1116
do{
1244
1117
ret = wait(NULL);
1245
1118
} while(ret >= 0);
1246
1119
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0