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- Committer: teddy at bsnet
- Date: 2010-09-27 17:39:03 UTC
- mto: (24.1.168 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100927173903-9s5e6a3hl5iswmp7
* mandos: Fixed "--help" output.
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
added
removed
plugin-runner.c
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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
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(),
42
42
WCOREDUMP() */
43
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
strsignal(), strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
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() */
71
75
72
76
#define BUFFER_SIZE 256
73
77
102
106
/* Gets an existing plugin based on name,
103
107
or if none is found, creates a new one */
104
108
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
106
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
111
if((p->name == name)
108
112
or (p->name and name and (strcmp(p->name, name) == 0))){
123
127
copy_name = strdup(name);
124
128
} while(copy_name == NULL and errno == EINTR);
125
129
if(copy_name == NULL){
130
int e = errno;
126
131
free(new_plugin);
132
errno = e;
127
133
return NULL;
128
134
}
129
135
}
137
143
new_plugin->argv = malloc(sizeof(char *) * 2);
138
144
} while(new_plugin->argv == NULL and errno == EINTR);
139
145
if(new_plugin->argv == NULL){
146
int e = errno;
140
147
free(copy_name);
141
148
free(new_plugin);
149
errno = e;
142
150
return NULL;
143
151
}
144
152
new_plugin->argv[0] = copy_name;
148
156
new_plugin->environ = malloc(sizeof(char *));
149
157
} while(new_plugin->environ == NULL and errno == EINTR);
150
158
if(new_plugin->environ == NULL){
159
int e = errno;
151
160
free(copy_name);
152
161
free(new_plugin->argv);
153
162
free(new_plugin);
163
errno = e;
154
164
return NULL;
155
165
}
156
166
new_plugin->environ[0] = NULL;
230
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
231
241
*/
232
242
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
244
/* If reading the flags failed, return error indication now. */
235
245
if(ret < 0){
236
246
return ret;
237
247
}
238
248
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
240
251
}
241
252
242
253
257
268
/* No child processes */
258
269
break;
259
270
}
260
perror("waitpid");
271
error(0, errno, "waitpid");
261
272
}
262
273
263
274
/* A child exited, find it in process_list */
348
359
sigemptyset(&sigchld_action.sa_mask);
349
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
350
361
if(ret == -1){
351
perror("sigaddset");
352
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
353
364
goto fallback;
354
365
}
355
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
356
367
if(ret == -1){
357
perror("sigaction");
358
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
359
370
goto fallback;
360
371
}
361
372
393
404
.doc = "Group ID the plugins will run as", .group = 3 },
394
405
{ .name = "debug", .key = 132,
395
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 },
396
416
{ .name = NULL }
397
417
};
398
418
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
401
421
switch(key){
402
422
char *tmp;
403
423
intmax_t tmpmax;
404
424
case 'g': /* --global-options */
405
if(arg != NULL){
425
{
406
426
char *plugin_option;
407
427
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
409
continue;
410
}
411
428
if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
429
break;
414
430
}
415
431
}
416
432
}
417
433
break;
418
434
case 'G': /* --global-env */
419
if(arg == NULL){
420
break;
421
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
424
}
435
add_environment(getplugin(NULL), arg, true);
425
436
break;
426
437
case 'o': /* --options-for */
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
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;
437
456
}
438
457
}
439
458
}
440
459
break;
441
460
case 'E': /* --env-for */
442
if(arg == NULL){
443
break;
444
}
445
461
{
446
462
char *envdef = strchr(arg, ':');
447
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
448
466
break;
449
467
}
450
468
*envdef = '\0';
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
453
474
}
475
add_environment(getplugin(arg), envdef, true);
454
476
}
455
477
break;
456
478
case 'd': /* --disable */
457
if(arg != NULL){
479
{
458
480
plugin *p = getplugin(arg);
459
if(p == NULL){
460
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
461
483
}
462
p->disabled = true;
463
484
}
464
485
break;
465
486
case 'e': /* --enable */
466
if(arg != NULL){
487
{
467
488
plugin *p = getplugin(arg);
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
470
491
}
471
p->disabled = false;
472
492
}
473
493
break;
474
494
case 128: /* --plugin-dir */
475
495
free(plugindir);
476
496
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
479
}
480
497
break;
481
498
case 129: /* --config-file */
482
499
/* This is already done by parse_opt_config_file() */
483
500
break;
484
501
case 130: /* --userid */
485
errno = 0;
486
502
tmpmax = strtoimax(arg, &tmp, 10);
487
503
if(errno != 0 or tmp == arg or *tmp != '\0'
488
504
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
493
508
}
509
uid = (uid_t)tmpmax;
494
510
break;
495
511
case 131: /* --groupid */
496
errno = 0;
497
512
tmpmax = strtoimax(arg, &tmp, 10);
498
513
if(errno != 0 or tmp == arg or *tmp != '\0'
499
514
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
504
518
}
519
gid = (gid_t)tmpmax;
505
520
break;
506
521
case 132: /* --debug */
507
522
debug = true;
508
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;
509
538
/*
510
539
* When adding more options before this line, remember to also add a
511
540
* "case" to the "parse_opt_config_file" function below.
514
543
/* Cryptsetup always passes an argument, which is an empty
515
544
string if "none" was specified in /etc/crypttab. So if
516
545
argument was empty, we ignore it silently. */
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
519
548
}
520
break;
521
case ARGP_KEY_END:
522
break;
523
549
default:
524
550
return ARGP_ERR_UNKNOWN;
525
551
}
526
return 0;
552
return errno; /* Set to 0 at start */
527
553
}
528
554
529
555
/* This option parser is the same as parse_opt() above, except it
531
557
error_t parse_opt_config_file(int key, char *arg,
532
558
__attribute__((unused))
533
559
struct argp_state *state){
560
errno = 0;
534
561
switch(key){
535
562
case 'g': /* --global-options */
536
563
case 'G': /* --global-env */
543
570
case 129: /* --config-file */
544
571
free(argfile);
545
572
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
548
}
549
573
break;
550
574
case 130: /* --userid */
551
575
case 131: /* --groupid */
552
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
553
580
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
555
581
break;
556
582
default:
557
583
return ARGP_ERR_UNKNOWN;
558
584
}
559
return 0;
585
return errno;
560
586
}
561
587
562
588
struct argp argp = { .options = options,
566
592
567
593
/* Parse using parse_opt_config_file() in order to get the custom
568
594
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
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;
573
609
goto fallback;
574
610
}
575
611
592
628
custom_argc = 1;
593
629
custom_argv = malloc(sizeof(char*) * 2);
594
630
if(custom_argv == NULL){
595
perror("malloc");
596
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
597
633
goto fallback;
598
634
}
599
635
custom_argv[0] = argv[0];
615
651
}
616
652
new_arg = strdup(p);
617
653
if(new_arg == NULL){
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
620
656
free(org_line);
621
657
goto fallback;
622
658
}
625
661
custom_argv = realloc(custom_argv, sizeof(char *)
626
662
* ((unsigned int) custom_argc + 1));
627
663
if(custom_argv == NULL){
628
perror("realloc");
629
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
630
666
free(org_line);
631
667
goto fallback;
632
668
}
638
674
ret = fclose(conffp);
639
675
} while(ret == EOF and errno == EINTR);
640
676
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
643
679
goto fallback;
644
680
}
645
681
free(org_line);
647
683
/* Check for harmful errors and go to fallback. Other errors might
648
684
not affect opening plugins */
649
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
perror("fopen");
651
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
652
688
goto fallback;
653
689
}
654
690
}
655
/* If there was any arguments from configuration file,
656
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 */
657
693
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
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;
663
708
goto fallback;
664
709
}
665
710
}
666
711
667
712
/* Parse actual command line arguments, to let them override the
668
713
config file */
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
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;
673
728
goto fallback;
674
729
}
675
730
690
745
/* Strip permissions down to nobody */
691
746
setgid(gid);
692
747
if(ret == -1){
693
perror("setgid");
748
error(0, errno, "setgid");
694
749
}
695
750
ret = setuid(uid);
696
751
if(ret == -1){
697
perror("setuid");
698
}
699
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
704
}
705
706
if(dir == NULL){
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
713
756
{
714
int dir_fd = dirfd(dir);
715
if(dir_fd >= 0){
716
ret = set_cloexec_flag(dir_fd);
717
if(ret < 0){
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
720
goto fallback;
721
}
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;
722
798
}
723
799
}
724
800
733
809
/* All directory entries have been processed */
734
810
if(dirst == NULL){
735
811
if(errno == EBADF){
736
perror("readdir");
737
exitstatus = EXIT_FAILURE;
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
738
814
goto fallback;
739
815
}
740
816
break;
770
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
847
size_t suf_len = strlen(*suf);
772
848
if((d_name_len >= suf_len)
773
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
774
850
== 0)){
775
851
if(debug){
776
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
788
864
789
865
char *filename;
790
866
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
793
869
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
796
873
}
797
874
if(ret < 0){
798
perror("asprintf");
875
error(0, errno, "asprintf");
799
876
continue;
800
877
}
801
878
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
803
880
if(ret == -1){
804
perror("stat");
881
error(0, errno, "stat");
805
882
free(filename);
806
883
continue;
807
884
}
819
896
820
897
plugin *p = getplugin(dirst->d_name);
821
898
if(p == NULL){
822
perror("getplugin");
899
error(0, errno, "getplugin");
823
900
free(filename);
824
901
continue;
825
902
}
837
914
if(g != NULL){
838
915
for(char **a = g->argv + 1; *a != NULL; a++){
839
916
if(not add_argument(p, *a)){
840
perror("add_argument");
917
error(0, errno, "add_argument");
841
918
}
842
919
}
843
920
/* Add global environment variables */
844
921
for(char **e = g->environ; *e != NULL; e++){
845
922
if(not add_environment(p, *e, false)){
846
perror("add_environment");
923
error(0, errno, "add_environment");
847
924
}
848
925
}
849
926
}
854
931
if(p->environ[0] != NULL){
855
932
for(char **e = environ; *e != NULL; e++){
856
933
if(not add_environment(p, *e, false)){
857
perror("add_environment");
934
error(0, errno, "add_environment");
858
935
}
859
936
}
860
937
}
861
938
862
939
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
864
941
if(ret == -1){
865
perror("pipe");
866
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
867
944
goto fallback;
868
945
}
869
946
/* Ask OS to automatic close the pipe on exec */
870
947
ret = set_cloexec_flag(pipefd[0]);
871
948
if(ret < 0){
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
874
951
goto fallback;
875
952
}
876
953
ret = set_cloexec_flag(pipefd[1]);
877
954
if(ret < 0){
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
880
957
goto fallback;
881
958
}
882
959
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
886
963
if(ret < 0){
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
889
966
goto fallback;
890
967
}
891
968
/* Starting a new process to be watched */
894
971
pid = fork();
895
972
} while(pid == -1 and errno == EINTR);
896
973
if(pid == -1){
897
perror("fork");
898
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
899
976
goto fallback;
900
977
}
901
978
if(pid == 0){
902
979
/* this is the child process */
903
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
904
981
if(ret < 0){
905
perror("sigaction");
906
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
907
984
}
908
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
986
if(ret < 0){
910
perror("sigprocmask");
911
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
912
989
}
913
990
914
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
915
992
if(ret == -1){
916
perror("dup2");
917
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
918
995
}
919
996
920
997
if(dirfd(dir) < 0){
924
1001
}
925
1002
if(p->environ[0] == NULL){
926
1003
if(execv(filename, p->argv) < 0){
927
perror("execv");
928
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
929
1006
}
930
1007
} else {
931
1008
if(execve(filename, p->argv, p->environ) < 0){
932
perror("execve");
933
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
934
1011
}
935
1012
}
936
1013
/* no return */
941
1018
free(filename);
942
1019
plugin *new_plugin = getplugin(dirst->d_name);
943
1020
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
948
1025
if(ret < 0){
949
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
950
1027
}
951
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
952
1029
goto fallback;
953
1030
}
954
1031
957
1034
958
1035
/* Unblock SIGCHLD so signal handler can be run if this process
959
1036
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
963
1040
if(ret < 0){
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
966
1043
goto fallback;
967
1044
}
968
1045
969
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
970
1048
971
1049
if(maxfd < new_plugin->fd){
972
1050
maxfd = new_plugin->fd;
993
1071
fd_set rfds = rfds_all;
994
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
1073
if(select_ret == -1 and errno != EINTR){
996
perror("select");
997
exitstatus = EXIT_FAILURE;
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
998
1076
goto fallback;
999
1077
}
1000
1078
/* OK, now either a process completed, or something can be read
1026
1104
}
1027
1105
1028
1106
/* Remove the plugin */
1029
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1030
1109
1031
1110
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
1035
1115
if(ret < 0){
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1038
1118
goto fallback;
1039
1119
}
1040
1120
1043
1123
proc = next_plugin;
1044
1124
1045
1125
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1049
1129
if(ret < 0){
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1052
1132
goto fallback;
1053
1133
}
1054
1134
1064
1144
bool bret = print_out_password(proc->buffer,
1065
1145
proc->buffer_length);
1066
1146
if(not bret){
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1069
1149
}
1070
1150
goto fallback;
1071
1151
}
1072
1152
1073
1153
/* This process has not completed. Does it have any output? */
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1075
1157
/* This process had nothing to say at this time */
1076
1158
proc = proc->next;
1077
1159
continue;
1081
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
1164
+ (size_t) BUFFER_SIZE);
1083
1165
if(proc->buffer == NULL){
1084
perror("malloc");
1085
exitstatus = EXIT_FAILURE;
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1086
1168
goto fallback;
1087
1169
}
1088
1170
proc->buffer_size += BUFFER_SIZE;
1109
1191
1110
1192
fallback:
1111
1193
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1113
1196
/* Fallback if all plugins failed, none are found or an error
1114
1197
occured */
1115
1198
bool bret;
1123
1206
}
1124
1207
bret = print_out_password(passwordbuffer, len);
1125
1208
if(not bret){
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1128
1211
}
1129
1212
}
1130
1213
1131
1214
/* Restore old signal handler */
1132
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1133
1216
if(ret == -1){
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1136
1219
}
1137
1220
1138
1221
if(custom_argv != NULL){
1153
1236
ret = kill(p->pid, SIGTERM);
1154
1237
if(ret == -1 and errno != ESRCH){
1155
1238
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1239
error(0, errno, "kill");
1157
1240
}
1158
1241
}
1159
1242
}
1163
1246
ret = wait(NULL);
1164
1247
} while(ret >= 0);
1165
1248
if(errno != ECHILD){
1166
perror("wait");
1249
error(0, errno, "wait");
1167
1250
}
1168
1251
1169
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0