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- Committer: Björn Påhlsson
- Date: 2011-10-02 19:18:24 UTC
- mto: This revision was merged to the branch mainline in revision 505.
- Revision ID: belorn@fukt.bsnet.se-20111002191824-eweh4pvneeg3qzia
transitional stuff actually working
documented change to D-Bus API
documented change to D-Bus API
- files added:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
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
687
742
}
688
743
}
689
744
690
/* Strip permissions down to nobody */
745
{
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 */
691
768
setgid(gid);
692
769
if(ret == -1){
693
perror("setgid");
770
error(0, errno, "setgid");
694
771
}
695
772
ret = setuid(uid);
696
773
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 */
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
713
778
{
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
}
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;
722
820
}
723
821
}
724
822
733
831
/* All directory entries have been processed */
734
832
if(dirst == NULL){
735
833
if(errno == EBADF){
736
perror("readdir");
737
exitstatus = EXIT_FAILURE;
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
738
836
goto fallback;
739
837
}
740
838
break;
770
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
869
size_t suf_len = strlen(*suf);
772
870
if((d_name_len >= suf_len)
773
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
774
872
== 0)){
775
873
if(debug){
776
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
788
886
789
887
char *filename;
790
888
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
793
891
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
796
895
}
797
896
if(ret < 0){
798
perror("asprintf");
897
error(0, errno, "asprintf");
799
898
continue;
800
899
}
801
900
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
803
902
if(ret == -1){
804
perror("stat");
903
error(0, errno, "stat");
805
904
free(filename);
806
905
continue;
807
906
}
819
918
820
919
plugin *p = getplugin(dirst->d_name);
821
920
if(p == NULL){
822
perror("getplugin");
921
error(0, errno, "getplugin");
823
922
free(filename);
824
923
continue;
825
924
}
837
936
if(g != NULL){
838
937
for(char **a = g->argv + 1; *a != NULL; a++){
839
938
if(not add_argument(p, *a)){
840
perror("add_argument");
939
error(0, errno, "add_argument");
841
940
}
842
941
}
843
942
/* Add global environment variables */
844
943
for(char **e = g->environ; *e != NULL; e++){
845
944
if(not add_environment(p, *e, false)){
846
perror("add_environment");
945
error(0, errno, "add_environment");
847
946
}
848
947
}
849
948
}
854
953
if(p->environ[0] != NULL){
855
954
for(char **e = environ; *e != NULL; e++){
856
955
if(not add_environment(p, *e, false)){
857
perror("add_environment");
956
error(0, errno, "add_environment");
858
957
}
859
958
}
860
959
}
861
960
862
961
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
864
963
if(ret == -1){
865
perror("pipe");
866
exitstatus = EXIT_FAILURE;
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
867
966
goto fallback;
868
967
}
869
968
/* Ask OS to automatic close the pipe on exec */
870
969
ret = set_cloexec_flag(pipefd[0]);
871
970
if(ret < 0){
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
874
973
goto fallback;
875
974
}
876
975
ret = set_cloexec_flag(pipefd[1]);
877
976
if(ret < 0){
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
880
979
goto fallback;
881
980
}
882
981
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
886
985
if(ret < 0){
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
889
988
goto fallback;
890
989
}
891
990
/* Starting a new process to be watched */
894
993
pid = fork();
895
994
} while(pid == -1 and errno == EINTR);
896
995
if(pid == -1){
897
perror("fork");
898
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
899
998
goto fallback;
900
999
}
901
1000
if(pid == 0){
902
1001
/* this is the child process */
903
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
904
1003
if(ret < 0){
905
perror("sigaction");
906
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
907
1006
}
908
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
1008
if(ret < 0){
910
perror("sigprocmask");
911
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
912
1011
}
913
1012
914
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
915
1014
if(ret == -1){
916
perror("dup2");
917
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
918
1017
}
919
1018
920
1019
if(dirfd(dir) < 0){
924
1023
}
925
1024
if(p->environ[0] == NULL){
926
1025
if(execv(filename, p->argv) < 0){
927
perror("execv");
928
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
929
1028
}
930
1029
} else {
931
1030
if(execve(filename, p->argv, p->environ) < 0){
932
perror("execve");
933
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
934
1033
}
935
1034
}
936
1035
/* no return */
941
1040
free(filename);
942
1041
plugin *new_plugin = getplugin(dirst->d_name);
943
1042
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
948
1047
if(ret < 0){
949
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
950
1049
}
951
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
952
1051
goto fallback;
953
1052
}
954
1053
957
1056
958
1057
/* Unblock SIGCHLD so signal handler can be run if this process
959
1058
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
963
1062
if(ret < 0){
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
966
1065
goto fallback;
967
1066
}
968
1067
969
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
970
1070
971
1071
if(maxfd < new_plugin->fd){
972
1072
maxfd = new_plugin->fd;
993
1093
fd_set rfds = rfds_all;
994
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
1095
if(select_ret == -1 and errno != EINTR){
996
perror("select");
997
exitstatus = EXIT_FAILURE;
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
998
1098
goto fallback;
999
1099
}
1000
1100
/* OK, now either a process completed, or something can be read
1026
1126
}
1027
1127
1028
1128
/* Remove the plugin */
1029
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1030
1131
1031
1132
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
1035
1137
if(ret < 0){
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
1038
1140
goto fallback;
1039
1141
}
1040
1142
1043
1145
proc = next_plugin;
1044
1146
1045
1147
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1049
1151
if(ret < 0){
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1052
1154
goto fallback;
1053
1155
}
1054
1156
1064
1166
bool bret = print_out_password(proc->buffer,
1065
1167
proc->buffer_length);
1066
1168
if(not bret){
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1069
1171
}
1070
1172
goto fallback;
1071
1173
}
1072
1174
1073
1175
/* This process has not completed. Does it have any output? */
1074
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 */
1075
1179
/* This process had nothing to say at this time */
1076
1180
proc = proc->next;
1077
1181
continue;
1081
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
1186
+ (size_t) BUFFER_SIZE);
1083
1187
if(proc->buffer == NULL){
1084
perror("malloc");
1085
exitstatus = EXIT_FAILURE;
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1086
1190
goto fallback;
1087
1191
}
1088
1192
proc->buffer_size += BUFFER_SIZE;
1109
1213
1110
1214
fallback:
1111
1215
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1113
1218
/* Fallback if all plugins failed, none are found or an error
1114
1219
occured */
1115
1220
bool bret;
1123
1228
}
1124
1229
bret = print_out_password(passwordbuffer, len);
1125
1230
if(not bret){
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1128
1233
}
1129
1234
}
1130
1235
1131
1236
/* Restore old signal handler */
1132
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1133
1238
if(ret == -1){
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1136
1241
}
1137
1242
1138
1243
if(custom_argv != NULL){
1153
1258
ret = kill(p->pid, SIGTERM);
1154
1259
if(ret == -1 and errno != ESRCH){
1155
1260
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1261
error(0, errno, "kill");
1157
1262
}
1158
1263
}
1159
1264
}
1163
1268
ret = wait(NULL);
1164
1269
} while(ret >= 0);
1165
1270
if(errno != ECHILD){
1166
perror("wait");
1271
error(0, errno, "wait");
1167
1272
}
1168
1273
1169
1274
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0