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- Committer: teddy at bsnet
- Date: 2010-09-27 18:57:12 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-20100927185712-d4t34t3y002xr44x
* mandos-clients.conf.xml (EXPANSION/RUNTIME EXPANSION): List possible
keys.
keys.
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))){
110
114
}
111
115
}
112
116
/* Create a new plugin */
113
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
114
121
if(new_plugin == NULL){
115
122
return NULL;
116
123
}
117
124
char *copy_name = NULL;
118
125
if(name != NULL){
119
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
120
129
if(copy_name == NULL){
130
int e = errno;
121
131
free(new_plugin);
132
errno = e;
122
133
return NULL;
123
134
}
124
135
}
128
139
.disabled = false,
129
140
.next = plugin_list };
130
141
131
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
132
145
if(new_plugin->argv == NULL){
146
int e = errno;
133
147
free(copy_name);
134
148
free(new_plugin);
149
errno = e;
135
150
return NULL;
136
151
}
137
152
new_plugin->argv[0] = copy_name;
138
153
new_plugin->argv[1] = NULL;
139
154
140
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
141
158
if(new_plugin->environ == NULL){
159
int e = errno;
142
160
free(copy_name);
143
161
free(new_plugin->argv);
144
162
free(new_plugin);
163
errno = e;
145
164
return NULL;
146
165
}
147
166
new_plugin->environ[0] = NULL;
155
174
static bool add_to_char_array(const char *new, char ***array,
156
175
int *len){
157
176
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
160
181
/* Malloc check */
161
182
if(*array == NULL){
162
183
return false;
163
184
}
164
185
/* Make a copy of the new string */
165
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
166
190
if(copy == NULL){
167
191
return false;
168
192
}
194
218
if(strncmp(*e, def, namelen + 1) == 0){
195
219
/* It already exists */
196
220
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
198
225
if(new == NULL){
199
226
return false;
200
227
}
213
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
214
241
*/
215
242
static int set_cloexec_flag(int fd){
216
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
217
244
/* If reading the flags failed, return error indication now. */
218
245
if(ret < 0){
219
246
return ret;
220
247
}
221
248
/* Store modified flag word in the descriptor. */
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
223
251
}
224
252
225
253
240
268
/* No child processes */
241
269
break;
242
270
}
243
perror("waitpid");
271
error(0, errno, "waitpid");
244
272
}
245
273
246
274
/* A child exited, find it in process_list */
317
345
fd_set rfds_all;
318
346
int ret, maxfd = 0;
319
347
ssize_t sret;
320
intmax_t tmpmax;
321
348
uid_t uid = 65534;
322
349
gid_t gid = 65534;
323
350
bool debug = false;
332
359
sigemptyset(&sigchld_action.sa_mask);
333
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
361
if(ret == -1){
335
perror("sigaddset");
336
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
337
364
goto fallback;
338
365
}
339
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
367
if(ret == -1){
341
perror("sigaction");
342
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
343
370
goto fallback;
344
371
}
345
372
377
404
.doc = "Group ID the plugins will run as", .group = 3 },
378
405
{ .name = "debug", .key = 132,
379
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 },
380
416
{ .name = NULL }
381
417
};
382
418
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
385
char *tmp;
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
386
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
387
424
case 'g': /* --global-options */
388
if(arg != NULL){
425
{
389
426
char *plugin_option;
390
427
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
428
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
429
break;
397
430
}
398
431
}
399
432
}
400
433
break;
401
434
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
407
}
435
add_environment(getplugin(NULL), arg, true);
408
436
break;
409
437
case 'o': /* --options-for */
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;
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;
420
456
}
421
457
}
422
458
}
423
459
break;
424
460
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
461
{
429
462
char *envdef = strchr(arg, ':');
430
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
431
466
break;
432
467
}
433
468
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
436
474
}
475
add_environment(getplugin(arg), envdef, true);
437
476
}
438
477
break;
439
478
case 'd': /* --disable */
440
if(arg != NULL){
479
{
441
480
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
444
483
}
445
p->disabled = true;
446
484
}
447
485
break;
448
486
case 'e': /* --enable */
449
if(arg != NULL){
487
{
450
488
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
453
491
}
454
p->disabled = false;
455
492
}
456
493
break;
457
494
case 128: /* --plugin-dir */
458
495
free(plugindir);
459
496
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
497
break;
464
498
case 129: /* --config-file */
465
499
/* This is already done by parse_opt_config_file() */
466
500
break;
467
501
case 130: /* --userid */
468
errno = 0;
469
502
tmpmax = strtoimax(arg, &tmp, 10);
470
503
if(errno != 0 or tmp == arg or *tmp != '\0'
471
504
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
476
508
}
509
uid = (uid_t)tmpmax;
477
510
break;
478
511
case 131: /* --groupid */
479
errno = 0;
480
512
tmpmax = strtoimax(arg, &tmp, 10);
481
513
if(errno != 0 or tmp == arg or *tmp != '\0'
482
514
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
487
518
}
519
gid = (gid_t)tmpmax;
488
520
break;
489
521
case 132: /* --debug */
490
522
debug = true;
491
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;
492
538
/*
493
539
* When adding more options before this line, remember to also add a
494
540
* "case" to the "parse_opt_config_file" function below.
497
543
/* Cryptsetup always passes an argument, which is an empty
498
544
string if "none" was specified in /etc/crypttab. So if
499
545
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
502
548
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
549
default:
507
550
return ARGP_ERR_UNKNOWN;
508
551
}
509
return 0;
552
return errno; /* Set to 0 at start */
510
553
}
511
554
512
555
/* This option parser is the same as parse_opt() above, except it
514
557
error_t parse_opt_config_file(int key, char *arg,
515
558
__attribute__((unused))
516
559
struct argp_state *state){
560
errno = 0;
517
561
switch(key){
518
562
case 'g': /* --global-options */
519
563
case 'G': /* --global-env */
526
570
case 129: /* --config-file */
527
571
free(argfile);
528
572
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
531
}
532
573
break;
533
574
case 130: /* --userid */
534
575
case 131: /* --groupid */
535
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
536
580
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
581
break;
539
582
default:
540
583
return ARGP_ERR_UNKNOWN;
541
584
}
542
return 0;
585
return errno;
543
586
}
544
587
545
588
struct argp argp = { .options = options,
549
592
550
593
/* Parse using parse_opt_config_file() in order to get the custom
551
594
config file location, if any. */
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;
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;
556
609
goto fallback;
557
610
}
558
611
575
628
custom_argc = 1;
576
629
custom_argv = malloc(sizeof(char*) * 2);
577
630
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
580
633
goto fallback;
581
634
}
582
635
custom_argv[0] = argv[0];
598
651
}
599
652
new_arg = strdup(p);
600
653
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
603
656
free(org_line);
604
657
goto fallback;
605
658
}
608
661
custom_argv = realloc(custom_argv, sizeof(char *)
609
662
* ((unsigned int) custom_argc + 1));
610
663
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
613
666
free(org_line);
614
667
goto fallback;
615
668
}
617
670
custom_argv[custom_argc] = NULL;
618
671
}
619
672
}
620
do{
673
do {
621
674
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
675
} while(ret == EOF and errno == EINTR);
623
676
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
626
679
goto fallback;
627
680
}
628
681
free(org_line);
630
683
/* Check for harmful errors and go to fallback. Other errors might
631
684
not affect opening plugins */
632
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
635
688
goto fallback;
636
689
}
637
690
}
638
/* If there was any arguments from configuration file,
639
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 */
640
693
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
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;
646
708
goto fallback;
647
709
}
648
710
}
649
711
650
712
/* Parse actual command line arguments, to let them override the
651
713
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
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;
656
728
goto fallback;
657
729
}
658
730
673
745
/* Strip permissions down to nobody */
674
746
setgid(gid);
675
747
if(ret == -1){
676
perror("setgid");
748
error(0, errno, "setgid");
677
749
}
678
750
ret = setuid(uid);
679
751
if(ret == -1){
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
689
if(dir == NULL){
690
perror("Could not open plugin dir");
691
exitstatus = EXIT_FAILURE;
692
goto fallback;
693
}
694
695
/* 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 */
696
756
{
697
int dir_fd = dirfd(dir);
698
if(dir_fd >= 0){
699
ret = set_cloexec_flag(dir_fd);
700
if(ret < 0){
701
perror("set_cloexec_flag");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
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;
705
798
}
706
799
}
707
800
709
802
710
803
/* Read and execute any executable in the plugin directory*/
711
804
while(true){
712
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
713
808
714
809
/* All directory entries have been processed */
715
810
if(dirst == NULL){
716
811
if(errno == EBADF){
717
perror("readdir");
718
exitstatus = EXIT_FAILURE;
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
719
814
goto fallback;
720
815
}
721
816
break;
751
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
752
847
size_t suf_len = strlen(*suf);
753
848
if((d_name_len >= suf_len)
754
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
755
850
== 0)){
756
851
if(debug){
757
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
769
864
770
865
char *filename;
771
866
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
773
869
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
775
873
}
776
874
if(ret < 0){
777
perror("asprintf");
875
error(0, errno, "asprintf");
778
876
continue;
779
877
}
780
878
781
ret = stat(filename, &st);
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
782
880
if(ret == -1){
783
perror("stat");
881
error(0, errno, "stat");
784
882
free(filename);
785
883
continue;
786
884
}
787
885
788
886
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
790
889
if(debug){
791
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
891
" with bad type or mode\n", filename);
797
896
798
897
plugin *p = getplugin(dirst->d_name);
799
898
if(p == NULL){
800
perror("getplugin");
899
error(0, errno, "getplugin");
801
900
free(filename);
802
901
continue;
803
902
}
815
914
if(g != NULL){
816
915
for(char **a = g->argv + 1; *a != NULL; a++){
817
916
if(not add_argument(p, *a)){
818
perror("add_argument");
917
error(0, errno, "add_argument");
819
918
}
820
919
}
821
920
/* Add global environment variables */
822
921
for(char **e = g->environ; *e != NULL; e++){
823
922
if(not add_environment(p, *e, false)){
824
perror("add_environment");
923
error(0, errno, "add_environment");
825
924
}
826
925
}
827
926
}
832
931
if(p->environ[0] != NULL){
833
932
for(char **e = environ; *e != NULL; e++){
834
933
if(not add_environment(p, *e, false)){
835
perror("add_environment");
934
error(0, errno, "add_environment");
836
935
}
837
936
}
838
937
}
839
938
840
939
int pipefd[2];
841
ret = pipe(pipefd);
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
842
941
if(ret == -1){
843
perror("pipe");
844
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
845
944
goto fallback;
846
945
}
847
946
/* Ask OS to automatic close the pipe on exec */
848
947
ret = set_cloexec_flag(pipefd[0]);
849
948
if(ret < 0){
850
perror("set_cloexec_flag");
851
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
852
951
goto fallback;
853
952
}
854
953
ret = set_cloexec_flag(pipefd[1]);
855
954
if(ret < 0){
856
perror("set_cloexec_flag");
857
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
858
957
goto fallback;
859
958
}
860
959
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
862
963
if(ret < 0){
863
perror("sigprocmask");
864
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
865
966
goto fallback;
866
967
}
867
968
/* Starting a new process to be watched */
868
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
869
973
if(pid == -1){
870
perror("fork");
871
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
872
976
goto fallback;
873
977
}
874
978
if(pid == 0){
875
979
/* this is the child process */
876
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
877
981
if(ret < 0){
878
perror("sigaction");
879
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
880
984
}
881
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
986
if(ret < 0){
883
perror("sigprocmask");
884
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
885
989
}
886
990
887
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
888
992
if(ret == -1){
889
perror("dup2");
890
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
891
995
}
892
996
893
997
if(dirfd(dir) < 0){
897
1001
}
898
1002
if(p->environ[0] == NULL){
899
1003
if(execv(filename, p->argv) < 0){
900
perror("execv");
901
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
902
1006
}
903
1007
} else {
904
1008
if(execve(filename, p->argv, p->environ) < 0){
905
perror("execve");
906
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
907
1011
}
908
1012
}
909
1013
/* no return */
910
1014
}
911
1015
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
913
1018
free(filename);
914
1019
plugin *new_plugin = getplugin(dirst->d_name);
915
1020
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
918
1025
if(ret < 0){
919
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
920
1027
}
921
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
922
1029
goto fallback;
923
1030
}
924
1031
927
1034
928
1035
/* Unblock SIGCHLD so signal handler can be run if this process
929
1036
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
931
1040
if(ret < 0){
932
perror("sigprocmask");
933
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
934
1043
goto fallback;
935
1044
}
936
1045
937
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
938
1048
939
1049
if(maxfd < new_plugin->fd){
940
1050
maxfd = new_plugin->fd;
941
1051
}
942
1052
}
943
1053
944
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
945
1055
dir = NULL;
946
1056
free_plugin(getplugin(NULL));
947
1057
960
1070
while(plugin_list){
961
1071
fd_set rfds = rfds_all;
962
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
964
perror("select");
965
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
966
1076
goto fallback;
967
1077
}
968
1078
/* OK, now either a process completed, or something can be read
994
1104
}
995
1105
996
1106
/* Remove the plugin */
997
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
998
1109
999
1110
/* Block signal while modifying process_list */
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
1001
1115
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1004
1118
goto fallback;
1005
1119
}
1006
1120
1009
1123
proc = next_plugin;
1010
1124
1011
1125
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1014
1129
if(ret < 0){
1015
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1017
1132
goto fallback;
1018
1133
}
1019
1134
1029
1144
bool bret = print_out_password(proc->buffer,
1030
1145
proc->buffer_length);
1031
1146
if(not bret){
1032
perror("print_out_password");
1033
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1034
1149
}
1035
1150
goto fallback;
1036
1151
}
1037
1152
1038
1153
/* This process has not completed. Does it have any output? */
1039
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 */
1040
1157
/* This process had nothing to say at this time */
1041
1158
proc = proc->next;
1042
1159
continue;
1046
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
1164
+ (size_t) BUFFER_SIZE);
1048
1165
if(proc->buffer == NULL){
1049
perror("malloc");
1050
exitstatus = EXIT_FAILURE;
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1051
1168
goto fallback;
1052
1169
}
1053
1170
proc->buffer_size += BUFFER_SIZE;
1054
1171
}
1055
1172
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1058
1177
if(sret < 0){
1059
1178
/* Read error from this process; ignore the error */
1060
1179
proc = proc->next;
1072
1191
1073
1192
fallback:
1074
1193
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1076
1196
/* Fallback if all plugins failed, none are found or an error
1077
1197
occured */
1078
1198
bool bret;
1086
1206
}
1087
1207
bret = print_out_password(passwordbuffer, len);
1088
1208
if(not bret){
1089
perror("print_out_password");
1090
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1091
1211
}
1092
1212
}
1093
1213
1094
1214
/* Restore old signal handler */
1095
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1096
1216
if(ret == -1){
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1099
1219
}
1100
1220
1101
1221
if(custom_argv != NULL){
1116
1236
ret = kill(p->pid, SIGTERM);
1117
1237
if(ret == -1 and errno != ESRCH){
1118
1238
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1239
error(0, errno, "kill");
1120
1240
}
1121
1241
}
1122
1242
}
1123
1243
1124
1244
/* Wait for any remaining child processes to terminate */
1125
do{
1245
do {
1126
1246
ret = wait(NULL);
1127
1247
} while(ret >= 0);
1128
1248
if(errno != ECHILD){
1129
perror("wait");
1249
error(0, errno, "wait");
1130
1250
}
1131
1251
1132
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0