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- Committer: Björn Påhlsson
- Date: 2009-09-07 22:21:35 UTC
- mfrom: (358 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 415.
- Revision ID: belorn@braxen-20090907222135-pk7qmvsg3bmqqo5i
merge
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(),
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, fdopendir(),
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
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(), strcmp(), strncmp() */
57
strsignal() */
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() */
75
71
76
72
#define BUFFER_SIZE 256
77
73
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
104
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
110
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
107
if((p->name == name)
112
108
or (p->name and name and (strcmp(p->name, name) == 0))){
114
110
}
115
111
}
116
112
/* 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);
113
plugin *new_plugin = malloc(sizeof(plugin));
121
114
if(new_plugin == NULL){
122
115
return NULL;
123
116
}
124
117
char *copy_name = NULL;
125
118
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
119
copy_name = strdup(name);
129
120
if(copy_name == NULL){
130
int e = errno;
131
121
free(new_plugin);
132
errno = e;
133
122
return NULL;
134
123
}
135
124
}
139
128
.disabled = false,
140
129
.next = plugin_list };
141
130
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
131
new_plugin->argv = malloc(sizeof(char *) * 2);
145
132
if(new_plugin->argv == NULL){
146
int e = errno;
147
133
free(copy_name);
148
134
free(new_plugin);
149
errno = e;
150
135
return NULL;
151
136
}
152
137
new_plugin->argv[0] = copy_name;
153
138
new_plugin->argv[1] = NULL;
154
139
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
140
new_plugin->environ = malloc(sizeof(char *));
158
141
if(new_plugin->environ == NULL){
159
int e = errno;
160
142
free(copy_name);
161
143
free(new_plugin->argv);
162
144
free(new_plugin);
163
errno = e;
164
145
return NULL;
165
146
}
166
147
new_plugin->environ[0] = NULL;
174
155
static bool add_to_char_array(const char *new, char ***array,
175
156
int *len){
176
157
/* 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);
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
181
160
/* Malloc check */
182
161
if(*array == NULL){
183
162
return false;
184
163
}
185
164
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
165
char *copy = strdup(new);
190
166
if(copy == NULL){
191
167
return false;
192
168
}
218
194
if(strncmp(*e, def, namelen + 1) == 0){
219
195
/* It already exists */
220
196
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
197
char *new = realloc(*e, strlen(def) + 1);
225
198
if(new == NULL){
226
199
return false;
227
200
}
237
210
/*
238
211
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
212
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
213
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
214
*/
242
215
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
216
int ret = fcntl(fd, F_GETFD, 0);
244
217
/* If reading the flags failed, return error indication now. */
245
218
if(ret < 0){
246
219
return ret;
247
220
}
248
221
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
223
}
252
224
253
225
268
240
/* No child processes */
269
241
break;
270
242
}
271
error(0, errno, "waitpid");
243
perror("waitpid");
272
244
}
273
245
274
246
/* A child exited, find it in process_list */
345
317
fd_set rfds_all;
346
318
int ret, maxfd = 0;
347
319
ssize_t sret;
320
intmax_t tmpmax;
348
321
uid_t uid = 65534;
349
322
gid_t gid = 65534;
350
323
bool debug = false;
359
332
sigemptyset(&sigchld_action.sa_mask);
360
333
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
334
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
364
337
goto fallback;
365
338
}
366
339
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
340
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
370
343
goto fallback;
371
344
}
372
345
404
377
.doc = "Group ID the plugins will run as", .group = 3 },
405
378
{ .name = "debug", .key = 132,
406
379
.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
380
{ .name = NULL }
417
381
};
418
382
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
421
386
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
387
case 'g': /* --global-options */
425
{
388
if(arg != NULL){
426
389
char *plugin_option;
427
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
428
394
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
430
397
}
431
398
}
432
399
}
433
400
break;
434
401
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
436
408
break;
437
409
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;
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
456
420
}
457
421
}
458
422
}
459
423
break;
460
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
461
428
{
462
429
char *envdef = strchr(arg, ':');
463
430
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
431
break;
467
432
}
468
433
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
474
436
}
475
add_environment(getplugin(arg), envdef, true);
476
437
}
477
438
break;
478
439
case 'd': /* --disable */
479
{
440
if(arg != NULL){
480
441
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
483
444
}
445
p->disabled = true;
484
446
}
485
447
break;
486
448
case 'e': /* --enable */
487
{
449
if(arg != NULL){
488
450
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
491
453
}
454
p->disabled = false;
492
455
}
493
456
break;
494
457
case 128: /* --plugin-dir */
495
458
free(plugindir);
496
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
497
463
break;
498
464
case 129: /* --config-file */
499
465
/* This is already done by parse_opt_config_file() */
500
466
break;
501
467
case 130: /* --userid */
468
errno = 0;
502
469
tmpmax = strtoimax(arg, &tmp, 10);
503
470
if(errno != 0 or tmp == arg or *tmp != '\0'
504
471
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
508
476
}
509
uid = (uid_t)tmpmax;
510
477
break;
511
478
case 131: /* --groupid */
479
errno = 0;
512
480
tmpmax = strtoimax(arg, &tmp, 10);
513
481
if(errno != 0 or tmp == arg or *tmp != '\0'
514
482
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
518
487
}
519
gid = (gid_t)tmpmax;
520
488
break;
521
489
case 132: /* --debug */
522
490
debug = true;
523
491
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
492
/*
539
493
* When adding more options before this line, remember to also add a
540
494
* "case" to the "parse_opt_config_file" function below.
543
497
/* Cryptsetup always passes an argument, which is an empty
544
498
string if "none" was specified in /etc/crypttab. So if
545
499
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
502
}
503
break;
504
case ARGP_KEY_END:
505
break;
549
506
default:
550
507
return ARGP_ERR_UNKNOWN;
551
508
}
552
return errno; /* Set to 0 at start */
509
return 0;
553
510
}
554
511
555
512
/* This option parser is the same as parse_opt() above, except it
557
514
error_t parse_opt_config_file(int key, char *arg,
558
515
__attribute__((unused))
559
516
struct argp_state *state){
560
errno = 0;
561
517
switch(key){
562
518
case 'g': /* --global-options */
563
519
case 'G': /* --global-env */
570
526
case 129: /* --config-file */
571
527
free(argfile);
572
528
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
573
532
break;
574
533
case 130: /* --userid */
575
534
case 131: /* --groupid */
576
535
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
536
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
581
538
break;
582
539
default:
583
540
return ARGP_ERR_UNKNOWN;
584
541
}
585
return errno;
542
return 0;
586
543
}
587
544
588
545
struct argp argp = { .options = options,
592
549
593
550
/* Parse using parse_opt_config_file() in order to get the custom
594
551
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;
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
609
556
goto fallback;
610
557
}
611
558
628
575
custom_argc = 1;
629
576
custom_argv = malloc(sizeof(char*) * 2);
630
577
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
633
580
goto fallback;
634
581
}
635
582
custom_argv[0] = argv[0];
651
598
}
652
599
new_arg = strdup(p);
653
600
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
656
603
free(org_line);
657
604
goto fallback;
658
605
}
661
608
custom_argv = realloc(custom_argv, sizeof(char *)
662
609
* ((unsigned int) custom_argc + 1));
663
610
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
666
613
free(org_line);
667
614
goto fallback;
668
615
}
670
617
custom_argv[custom_argc] = NULL;
671
618
}
672
619
}
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
620
free(org_line);
682
621
} else {
683
622
/* Check for harmful errors and go to fallback. Other errors might
684
623
not affect opening plugins */
685
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
625
perror("fopen");
626
exitstatus = EXIT_FAILURE;
688
627
goto fallback;
689
628
}
690
629
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
693
632
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;
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
634
0, NULL);
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
708
638
goto fallback;
709
639
}
710
640
}
711
641
712
642
/* Parse actual command line arguments, to let them override the
713
643
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;
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
728
648
goto fallback;
729
649
}
730
650
745
665
/* Strip permissions down to nobody */
746
666
setgid(gid);
747
667
if(ret == -1){
748
error(0, errno, "setgid");
668
perror("setgid");
749
669
}
750
670
ret = setuid(uid);
751
671
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
672
perror("setuid");
673
}
674
675
if(plugindir == NULL){
676
dir = opendir(PDIR);
677
} else {
678
dir = opendir(plugindir);
679
}
680
681
if(dir == NULL){
682
perror("Could not open plugin dir");
683
exitstatus = EXIT_FAILURE;
684
goto fallback;
685
}
686
687
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
688
{
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;
689
int dir_fd = dirfd(dir);
690
if(dir_fd >= 0){
691
ret = set_cloexec_flag(dir_fd);
692
if(ret < 0){
693
perror("set_cloexec_flag");
694
exitstatus = EXIT_FAILURE;
695
goto fallback;
696
}
798
697
}
799
698
}
800
699
802
701
803
702
/* Read and execute any executable in the plugin directory*/
804
703
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
704
dirst = readdir(dir);
808
705
809
706
/* All directory entries have been processed */
810
707
if(dirst == NULL){
811
708
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
709
perror("readdir");
710
exitstatus = EXIT_FAILURE;
814
711
goto fallback;
815
712
}
816
713
break;
846
743
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
744
size_t suf_len = strlen(*suf);
848
745
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
746
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
747
== 0)){
851
748
if(debug){
852
749
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
864
761
865
762
char *filename;
866
763
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
869
765
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
873
767
}
874
768
if(ret < 0){
875
error(0, errno, "asprintf");
769
perror("asprintf");
876
770
continue;
877
771
}
878
772
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
773
ret = stat(filename, &st);
880
774
if(ret == -1){
881
error(0, errno, "stat");
775
perror("stat");
882
776
free(filename);
883
777
continue;
884
778
}
885
779
886
780
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
782
if(debug){
890
783
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
784
" with bad type or mode\n", filename);
896
789
897
790
plugin *p = getplugin(dirst->d_name);
898
791
if(p == NULL){
899
error(0, errno, "getplugin");
792
perror("getplugin");
900
793
free(filename);
901
794
continue;
902
795
}
914
807
if(g != NULL){
915
808
for(char **a = g->argv + 1; *a != NULL; a++){
916
809
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
810
perror("add_argument");
918
811
}
919
812
}
920
813
/* Add global environment variables */
921
814
for(char **e = g->environ; *e != NULL; e++){
922
815
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
816
perror("add_environment");
924
817
}
925
818
}
926
819
}
931
824
if(p->environ[0] != NULL){
932
825
for(char **e = environ; *e != NULL; e++){
933
826
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
827
perror("add_environment");
935
828
}
936
829
}
937
830
}
938
831
939
832
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
833
ret = pipe(pipefd);
941
834
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
835
perror("pipe");
836
exitstatus = EXIT_FAILURE;
944
837
goto fallback;
945
838
}
946
839
/* Ask OS to automatic close the pipe on exec */
947
840
ret = set_cloexec_flag(pipefd[0]);
948
841
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
951
844
goto fallback;
952
845
}
953
846
ret = set_cloexec_flag(pipefd[1]);
954
847
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
848
perror("set_cloexec_flag");
849
exitstatus = EXIT_FAILURE;
957
850
goto fallback;
958
851
}
959
852
/* 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));
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
854
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
966
857
goto fallback;
967
858
}
968
859
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
860
pid_t pid = fork();
973
861
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
862
perror("fork");
863
exitstatus = EXIT_FAILURE;
976
864
goto fallback;
977
865
}
978
866
if(pid == 0){
979
867
/* this is the child process */
980
868
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
869
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
870
perror("sigaction");
871
_exit(EXIT_FAILURE);
984
872
}
985
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
874
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
875
perror("sigprocmask");
876
_exit(EXIT_FAILURE);
989
877
}
990
878
991
879
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
880
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
881
perror("dup2");
882
_exit(EXIT_FAILURE);
995
883
}
996
884
997
885
if(dirfd(dir) < 0){
1001
889
}
1002
890
if(p->environ[0] == NULL){
1003
891
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
892
perror("execv");
893
_exit(EXIT_FAILURE);
1006
894
}
1007
895
} else {
1008
896
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
897
perror("execve");
898
_exit(EXIT_FAILURE);
1011
899
}
1012
900
}
1013
901
/* no return */
1014
902
}
1015
903
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
904
close(pipefd[1]); /* Close unused write end of pipe */
1018
905
free(filename);
1019
906
plugin *new_plugin = getplugin(dirst->d_name);
1020
907
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)));
908
perror("getplugin");
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
910
if(ret < 0){
1026
error(0, errno, "sigprocmask");
911
perror("sigprocmask");
1027
912
}
1028
exitstatus = EX_OSERR;
913
exitstatus = EXIT_FAILURE;
1029
914
goto fallback;
1030
915
}
1031
916
1034
919
1035
920
/* Unblock SIGCHLD so signal handler can be run if this process
1036
921
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
922
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
923
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
924
perror("sigprocmask");
925
exitstatus = EXIT_FAILURE;
1043
926
goto fallback;
1044
927
}
1045
928
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
929
FD_SET(new_plugin->fd, &rfds_all);
1048
930
1049
931
if(maxfd < new_plugin->fd){
1050
932
maxfd = new_plugin->fd;
1051
933
}
1052
934
}
1053
935
1054
TEMP_FAILURE_RETRY(closedir(dir));
936
closedir(dir);
1055
937
dir = NULL;
1056
938
free_plugin(getplugin(NULL));
1057
939
1070
952
while(plugin_list){
1071
953
fd_set rfds = rfds_all;
1072
954
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;
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1076
958
goto fallback;
1077
959
}
1078
960
/* OK, now either a process completed, or something can be read
1104
986
}
1105
987
1106
988
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
989
FD_CLR(proc->fd, &rfds_all);
1109
990
1110
991
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
993
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1118
996
goto fallback;
1119
997
}
1120
998
1123
1001
proc = next_plugin;
1124
1002
1125
1003
/* 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)));
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1129
1006
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1132
1009
goto fallback;
1133
1010
}
1134
1011
1144
1021
bool bret = print_out_password(proc->buffer,
1145
1022
proc->buffer_length);
1146
1023
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1149
1026
}
1150
1027
goto fallback;
1151
1028
}
1152
1029
1153
1030
/* 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 */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1032
/* This process had nothing to say at this time */
1158
1033
proc = proc->next;
1159
1034
continue;
1163
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1039
+ (size_t) BUFFER_SIZE);
1165
1040
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1168
1043
goto fallback;
1169
1044
}
1170
1045
proc->buffer_size += BUFFER_SIZE;
1171
1046
}
1172
1047
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1177
1050
if(sret < 0){
1178
1051
/* Read error from this process; ignore the error */
1179
1052
proc = proc->next;
1191
1064
1192
1065
fallback:
1193
1066
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1068
/* Fallback if all plugins failed, none are found or an error
1197
1069
occured */
1198
1070
bool bret;
1206
1078
}
1207
1079
bret = print_out_password(passwordbuffer, len);
1208
1080
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1211
1083
}
1212
1084
}
1213
1085
1214
1086
/* Restore old signal handler */
1215
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1088
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1219
1091
}
1220
1092
1221
1093
if(custom_argv != NULL){
1236
1108
ret = kill(p->pid, SIGTERM);
1237
1109
if(ret == -1 and errno != ESRCH){
1238
1110
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1111
perror("kill");
1240
1112
}
1241
1113
}
1242
1114
}
1243
1115
1244
1116
/* Wait for any remaining child processes to terminate */
1245
do {
1117
do{
1246
1118
ret = wait(NULL);
1247
1119
} while(ret >= 0);
1248
1120
if(errno != ECHILD){
1249
error(0, errno, "wait");
1121
perror("wait");
1250
1122
}
1251
1123
1252
1124
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0