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- Committer: Teddy Hogeborn
- Date: 2009-02-23 11:52:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20090223115242-5930ewin7m4o6zpr
* README (The Plugin System): Improve wording.
- files removed:
- dbus-mandos.conf
- files modified:
- Makefile
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
#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,
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
70
68
#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() */
75
69
76
70
#define BUFFER_SIZE 256
77
71
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;
174
153
static bool add_to_char_array(const char *new, char ***array,
175
154
int *len){
176
155
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
181
158
/* Malloc check */
182
159
if(*array == NULL){
183
160
return false;
184
161
}
185
162
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
190
164
if(copy == NULL){
191
165
return false;
192
166
}
218
192
if(strncmp(*e, def, namelen + 1) == 0){
219
193
/* It already exists */
220
194
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
195
char *new = realloc(*e, strlen(def) + 1);
225
196
if(new == NULL){
226
197
return false;
227
198
}
237
208
/*
238
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
210
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
212
*/
242
213
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
244
215
/* If reading the flags failed, return error indication now. */
245
216
if(ret < 0){
246
217
return ret;
247
218
}
248
219
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
221
}
252
222
253
223
268
238
/* No child processes */
269
239
break;
270
240
}
271
error(0, errno, "waitpid");
241
perror("waitpid");
272
242
}
273
243
274
244
/* A child exited, find it in process_list */
345
315
fd_set rfds_all;
346
316
int ret, maxfd = 0;
347
317
ssize_t sret;
318
intmax_t tmpmax;
348
319
uid_t uid = 65534;
349
320
gid_t gid = 65534;
350
321
bool debug = false;
359
330
sigemptyset(&sigchld_action.sa_mask);
360
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
332
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
364
335
goto fallback;
365
336
}
366
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
338
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
370
341
goto fallback;
371
342
}
372
343
404
375
.doc = "Group ID the plugins will run as", .group = 3 },
405
376
{ .name = "debug", .key = 132,
406
377
.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 },
416
378
{ .name = NULL }
417
379
};
418
380
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
421
384
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
385
case 'g': /* --global-options */
425
{
386
if(arg != NULL){
426
387
char *plugin_option;
427
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
428
392
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
430
395
}
431
396
}
432
397
}
433
398
break;
434
399
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
405
}
436
406
break;
437
407
case 'o': /* --options-for */
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;
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
456
418
}
457
419
}
458
420
}
459
421
break;
460
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
461
426
{
462
427
char *envdef = strchr(arg, ':');
463
428
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
429
break;
467
430
}
468
431
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
474
434
}
475
add_environment(getplugin(arg), envdef, true);
476
435
}
477
436
break;
478
437
case 'd': /* --disable */
479
{
438
if(arg != NULL){
480
439
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
483
442
}
443
p->disabled = true;
484
444
}
485
445
break;
486
446
case 'e': /* --enable */
487
{
447
if(arg != NULL){
488
448
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
491
451
}
452
p->disabled = false;
492
453
}
493
454
break;
494
455
case 128: /* --plugin-dir */
495
456
free(plugindir);
496
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
497
461
break;
498
462
case 129: /* --config-file */
499
463
/* This is already done by parse_opt_config_file() */
500
464
break;
501
465
case 130: /* --userid */
466
errno = 0;
502
467
tmpmax = strtoimax(arg, &tmp, 10);
503
468
if(errno != 0 or tmp == arg or *tmp != '\0'
504
469
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
508
474
}
509
uid = (uid_t)tmpmax;
510
475
break;
511
476
case 131: /* --groupid */
477
errno = 0;
512
478
tmpmax = strtoimax(arg, &tmp, 10);
513
479
if(errno != 0 or tmp == arg or *tmp != '\0'
514
480
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
518
485
}
519
gid = (gid_t)tmpmax;
520
486
break;
521
487
case 132: /* --debug */
522
488
debug = true;
523
489
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;
538
490
/*
539
491
* When adding more options before this line, remember to also add a
540
492
* "case" to the "parse_opt_config_file" function below.
543
495
/* Cryptsetup always passes an argument, which is an empty
544
496
string if "none" was specified in /etc/crypttab. So if
545
497
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
549
504
default:
550
505
return ARGP_ERR_UNKNOWN;
551
506
}
552
return errno; /* Set to 0 at start */
507
return 0;
553
508
}
554
509
555
510
/* This option parser is the same as parse_opt() above, except it
557
512
error_t parse_opt_config_file(int key, char *arg,
558
513
__attribute__((unused))
559
514
struct argp_state *state){
560
errno = 0;
561
515
switch(key){
562
516
case 'g': /* --global-options */
563
517
case 'G': /* --global-env */
570
524
case 129: /* --config-file */
571
525
free(argfile);
572
526
argfile = strdup(arg);
573
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
574
531
case 130: /* --userid */
575
532
case 131: /* --groupid */
576
533
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
581
536
break;
582
537
default:
583
538
return ARGP_ERR_UNKNOWN;
584
539
}
585
return errno;
540
return 0;
586
541
}
587
542
588
543
struct argp argp = { .options = options,
592
547
593
548
/* Parse using parse_opt_config_file() in order to get the custom
594
549
config file location, if any. */
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;
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
609
554
goto fallback;
610
555
}
611
556
617
562
conffp = fopen(AFILE, "r");
618
563
} else {
619
564
conffp = fopen(argfile, "r");
620
}
565
}
621
566
if(conffp != NULL){
622
567
char *org_line = NULL;
623
568
char *p, *arg, *new_arg, *line;
628
573
custom_argc = 1;
629
574
custom_argv = malloc(sizeof(char*) * 2);
630
575
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
633
578
goto fallback;
634
579
}
635
580
custom_argv[0] = argv[0];
651
596
}
652
597
new_arg = strdup(p);
653
598
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
656
601
free(org_line);
657
602
goto fallback;
658
603
}
661
606
custom_argv = realloc(custom_argv, sizeof(char *)
662
607
* ((unsigned int) custom_argc + 1));
663
608
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
666
611
free(org_line);
667
612
goto fallback;
668
613
}
669
614
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
671
616
}
672
617
}
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
}
681
618
free(org_line);
682
619
} else {
683
620
/* Check for harmful errors and go to fallback. Other errors might
684
621
not affect opening plugins */
685
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
688
625
goto fallback;
689
626
}
690
627
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
693
630
if(custom_argv != NULL){
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;
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
708
636
goto fallback;
709
637
}
710
638
}
711
639
712
640
/* Parse actual command line arguments, to let them override the
713
641
config file */
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;
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
728
646
goto fallback;
729
647
}
730
648
745
663
/* Strip permissions down to nobody */
746
664
setgid(gid);
747
665
if(ret == -1){
748
error(0, errno, "setgid");
666
perror("setgid");
749
667
}
750
668
ret = setuid(uid);
751
669
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
686
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
798
695
}
799
696
}
800
697
802
699
803
700
/* Read and execute any executable in the plugin directory*/
804
701
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
808
703
809
704
/* All directory entries have been processed */
810
705
if(dirst == NULL){
811
706
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
814
709
goto fallback;
815
710
}
816
711
break;
846
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
742
size_t suf_len = strlen(*suf);
848
743
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
745
== 0)){
851
746
if(debug){
852
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
864
759
865
760
char *filename;
866
761
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
869
763
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
873
765
}
874
766
if(ret < 0){
875
error(0, errno, "asprintf");
767
perror("asprintf");
876
768
continue;
877
769
}
878
770
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
880
772
if(ret == -1){
881
error(0, errno, "stat");
773
perror("stat");
882
774
free(filename);
883
775
continue;
884
776
}
885
777
886
778
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
780
if(debug){
890
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
782
" with bad type or mode\n", filename);
896
787
897
788
plugin *p = getplugin(dirst->d_name);
898
789
if(p == NULL){
899
error(0, errno, "getplugin");
790
perror("getplugin");
900
791
free(filename);
901
792
continue;
902
793
}
914
805
if(g != NULL){
915
806
for(char **a = g->argv + 1; *a != NULL; a++){
916
807
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
808
perror("add_argument");
918
809
}
919
810
}
920
811
/* Add global environment variables */
921
812
for(char **e = g->environ; *e != NULL; e++){
922
813
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
814
perror("add_environment");
924
815
}
925
816
}
926
817
}
931
822
if(p->environ[0] != NULL){
932
823
for(char **e = environ; *e != NULL; e++){
933
824
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
825
perror("add_environment");
935
826
}
936
827
}
937
828
}
938
829
939
830
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
941
832
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
944
835
goto fallback;
945
836
}
946
837
/* Ask OS to automatic close the pipe on exec */
947
838
ret = set_cloexec_flag(pipefd[0]);
948
839
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
951
842
goto fallback;
952
843
}
953
844
ret = set_cloexec_flag(pipefd[1]);
954
845
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
957
848
goto fallback;
958
849
}
959
850
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
852
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
966
855
goto fallback;
967
856
}
968
857
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
973
859
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
976
862
goto fallback;
977
863
}
978
864
if(pid == 0){
979
865
/* this is the child process */
980
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
867
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
984
870
}
985
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
872
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
989
875
}
990
876
991
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
878
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
879
perror("dup2");
880
_exit(EXIT_FAILURE);
995
881
}
996
882
997
883
if(dirfd(dir) < 0){
1001
887
}
1002
888
if(p->environ[0] == NULL){
1003
889
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
890
perror("execv");
891
_exit(EXIT_FAILURE);
1006
892
}
1007
893
} else {
1008
894
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
895
perror("execve");
896
_exit(EXIT_FAILURE);
1011
897
}
1012
898
}
1013
899
/* no return */
1014
900
}
1015
901
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1018
903
free(filename);
1019
904
plugin *new_plugin = getplugin(dirst->d_name);
1020
905
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
908
if(ret < 0){
1026
error(0, errno, "sigprocmask");
909
perror("sigprocmask");
1027
910
}
1028
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1029
912
goto fallback;
1030
913
}
1031
914
1034
917
1035
918
/* Unblock SIGCHLD so signal handler can be run if this process
1036
919
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
921
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1043
924
goto fallback;
1044
925
}
1045
926
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
927
FD_SET(new_plugin->fd, &rfds_all);
1048
928
1049
929
if(maxfd < new_plugin->fd){
1050
930
maxfd = new_plugin->fd;
1051
931
}
1052
932
}
1053
933
1054
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1055
935
dir = NULL;
1056
936
free_plugin(getplugin(NULL));
1057
937
1070
950
while(plugin_list){
1071
951
fd_set rfds = rfds_all;
1072
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1076
956
goto fallback;
1077
957
}
1078
958
/* OK, now either a process completed, or something can be read
1093
973
WEXITSTATUS(proc->status));
1094
974
} else if(WIFSIGNALED(proc->status)){
1095
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
976
" signal %d\n", proc->name,
1097
977
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
978
WTERMSIG(proc->status));
1100
979
} else if(WCOREDUMP(proc->status)){
1101
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
981
" core\n", proc->name, (intmax_t) (proc->pid));
1104
983
}
1105
984
1106
985
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
986
FD_CLR(proc->fd, &rfds_all);
1109
987
1110
988
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
990
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1118
993
goto fallback;
1119
994
}
1120
995
1123
998
proc = next_plugin;
1124
999
1125
1000
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1129
1003
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1132
1006
goto fallback;
1133
1007
}
1134
1008
1144
1018
bool bret = print_out_password(proc->buffer,
1145
1019
proc->buffer_length);
1146
1020
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1149
1023
}
1150
1024
goto fallback;
1151
1025
}
1152
1026
1153
1027
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1029
/* This process had nothing to say at this time */
1158
1030
proc = proc->next;
1159
1031
continue;
1163
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1036
+ (size_t) BUFFER_SIZE);
1165
1037
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1168
1040
goto fallback;
1169
1041
}
1170
1042
proc->buffer_size += BUFFER_SIZE;
1171
1043
}
1172
1044
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1177
1047
if(sret < 0){
1178
1048
/* Read error from this process; ignore the error */
1179
1049
proc = proc->next;
1191
1061
1192
1062
fallback:
1193
1063
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1065
/* Fallback if all plugins failed, none are found or an error
1197
1066
occured */
1198
1067
bool bret;
1206
1075
}
1207
1076
bret = print_out_password(passwordbuffer, len);
1208
1077
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1211
1080
}
1212
1081
}
1213
1082
1214
1083
/* Restore old signal handler */
1215
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1085
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1219
1088
}
1220
1089
1221
1090
if(custom_argv != NULL){
1236
1105
ret = kill(p->pid, SIGTERM);
1237
1106
if(ret == -1 and errno != ESRCH){
1238
1107
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1108
perror("kill");
1240
1109
}
1241
1110
}
1242
1111
}
1243
1112
1244
1113
/* Wait for any remaining child processes to terminate */
1245
do {
1114
do{
1246
1115
ret = wait(NULL);
1247
1116
} while(ret >= 0);
1248
1117
if(errno != ECHILD){
1249
error(0, errno, "wait");
1118
perror("wait");
1250
1119
}
1251
1120
1252
1121
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0