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- Committer: Teddy Hogeborn
- Date: 2009-02-12 06:09:24 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090212060924-vwxgitxnwr14w9e4
* mandos (Client.start_checker): Bug fix: Add extra check in case the
checker process completed quickly.
checker process completed quickly.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
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
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
67
65
SIG_UNBLOCK, kill(), sig_atomic_t
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
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() */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
69
76
70
#define BUFFER_SIZE 256
77
71
88
82
char **environ;
89
83
int envc;
90
84
bool disabled;
91
85
92
86
/* Variables used for running processes*/
93
87
pid_t pid;
94
88
int fd;
106
100
/* Gets an existing plugin based on name,
107
101
or if none is found, creates a new one */
108
102
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
103
/* Check for exiting plugin with that name */
110
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
105
if((p->name == name)
112
106
or (p->name and name and (strcmp(p->name, name) == 0))){
114
108
}
115
109
}
116
110
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
111
plugin *new_plugin = malloc(sizeof(plugin));
121
112
if(new_plugin == NULL){
122
113
return NULL;
123
114
}
124
115
char *copy_name = NULL;
125
116
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
129
118
if(copy_name == NULL){
130
int e = errno;
131
119
free(new_plugin);
132
errno = e;
133
120
return NULL;
134
121
}
135
122
}
139
126
.disabled = false,
140
127
.next = plugin_list };
141
128
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
145
130
if(new_plugin->argv == NULL){
146
int e = errno;
147
131
free(copy_name);
148
132
free(new_plugin);
149
errno = e;
150
133
return NULL;
151
134
}
152
135
new_plugin->argv[0] = copy_name;
153
136
new_plugin->argv[1] = NULL;
154
137
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
158
139
if(new_plugin->environ == NULL){
159
int e = errno;
160
140
free(copy_name);
161
141
free(new_plugin->argv);
162
142
free(new_plugin);
163
errno = e;
164
143
return NULL;
165
144
}
166
145
new_plugin->environ[0] = NULL;
174
153
static bool add_to_char_array(const char *new, char ***array,
175
154
int *len){
176
155
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
181
158
/* Malloc check */
182
159
if(*array == NULL){
183
160
return false;
184
161
}
185
162
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
190
164
if(copy == NULL){
191
165
return false;
192
166
}
218
192
if(strncmp(*e, def, namelen + 1) == 0){
219
193
/* It already exists */
220
194
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
195
char *new = realloc(*e, strlen(def) + 1);
225
196
if(new == NULL){
226
197
return false;
227
198
}
237
208
/*
238
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
210
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
212
*/
242
213
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
244
215
/* If reading the flags failed, return error indication now. */
245
216
if(ret < 0){
246
217
return ret;
247
218
}
248
219
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
221
}
252
222
253
223
268
238
/* No child processes */
269
239
break;
270
240
}
271
error(0, errno, "waitpid");
241
perror("waitpid");
272
242
}
273
243
274
244
/* A child exited, find it in process_list */
310
280
}
311
281
free(plugin_node->environ);
312
282
free(plugin_node->buffer);
313
283
314
284
/* Removes the plugin from the singly-linked list */
315
285
if(plugin_node == plugin_list){
316
286
/* First one - simple */
343
313
struct dirent *dirst;
344
314
struct stat st;
345
315
fd_set rfds_all;
346
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
347
317
ssize_t sret;
318
intmax_t tmpmax;
348
319
uid_t uid = 65534;
349
320
gid_t gid = 65534;
350
321
bool debug = false;
359
330
sigemptyset(&sigchld_action.sa_mask);
360
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
332
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
364
335
goto fallback;
365
336
}
366
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
338
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
370
341
goto fallback;
371
342
}
372
343
404
375
.doc = "Group ID the plugins will run as", .group = 3 },
405
376
{ .name = "debug", .key = 132,
406
377
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
378
{ .name = NULL }
417
379
};
418
380
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
421
383
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
384
case 'g': /* --global-options */
425
{
385
if(arg != NULL){
426
386
char *plugin_option;
427
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
428
391
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
430
394
}
431
395
}
432
396
}
433
397
break;
434
398
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
436
405
break;
437
406
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;
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
456
417
}
457
418
}
458
419
}
459
420
break;
460
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
461
425
{
462
426
char *envdef = strchr(arg, ':');
463
427
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
428
break;
467
429
}
468
430
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
474
433
}
475
add_environment(getplugin(arg), envdef, true);
476
434
}
477
435
break;
478
436
case 'd': /* --disable */
479
{
437
if(arg != NULL){
480
438
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
483
441
}
442
p->disabled = true;
484
443
}
485
444
break;
486
445
case 'e': /* --enable */
487
{
446
if(arg != NULL){
488
447
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
491
450
}
451
p->disabled = false;
492
452
}
493
453
break;
494
454
case 128: /* --plugin-dir */
495
455
free(plugindir);
496
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
497
460
break;
498
461
case 129: /* --config-file */
499
462
/* This is already done by parse_opt_config_file() */
500
463
break;
501
464
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
508
472
}
509
uid = (uid_t)tmpmax;
510
473
break;
511
474
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
518
482
}
519
gid = (gid_t)tmpmax;
520
483
break;
521
484
case 132: /* --debug */
522
485
debug = true;
523
486
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
487
/*
539
488
* When adding more options before this line, remember to also add a
540
489
* "case" to the "parse_opt_config_file" function below.
543
492
/* Cryptsetup always passes an argument, which is an empty
544
493
string if "none" was specified in /etc/crypttab. So if
545
494
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
549
501
default:
550
502
return ARGP_ERR_UNKNOWN;
551
503
}
552
return errno; /* Set to 0 at start */
504
return 0;
553
505
}
554
506
555
507
/* This option parser is the same as parse_opt() above, except it
557
509
error_t parse_opt_config_file(int key, char *arg,
558
510
__attribute__((unused))
559
511
struct argp_state *state){
560
errno = 0;
561
512
switch(key){
562
513
case 'g': /* --global-options */
563
514
case 'G': /* --global-env */
570
521
case 129: /* --config-file */
571
522
free(argfile);
572
523
argfile = strdup(arg);
573
break;
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
574
528
case 130: /* --userid */
575
529
case 131: /* --groupid */
576
530
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
581
533
break;
582
534
default:
583
535
return ARGP_ERR_UNKNOWN;
584
536
}
585
return errno;
537
return 0;
586
538
}
587
539
588
540
struct argp argp = { .options = options,
592
544
593
545
/* Parse using parse_opt_config_file() in order to get the custom
594
546
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;
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
609
551
goto fallback;
610
552
}
611
553
617
559
conffp = fopen(AFILE, "r");
618
560
} else {
619
561
conffp = fopen(argfile, "r");
620
}
562
}
621
563
if(conffp != NULL){
622
564
char *org_line = NULL;
623
565
char *p, *arg, *new_arg, *line;
624
566
size_t size = 0;
625
567
const char whitespace_delims[] = " \r\t\f\v\n";
626
568
const char comment_delim[] = "#";
627
569
628
570
custom_argc = 1;
629
571
custom_argv = malloc(sizeof(char*) * 2);
630
572
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
633
575
goto fallback;
634
576
}
635
577
custom_argv[0] = argv[0];
636
578
custom_argv[1] = NULL;
637
579
638
580
/* for each line in the config file, strip whitespace and ignore
639
581
commented text */
640
582
while(true){
642
584
if(sret == -1){
643
585
break;
644
586
}
645
587
646
588
line = org_line;
647
589
arg = strsep(&line, comment_delim);
648
590
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
593
}
652
594
new_arg = strdup(p);
653
595
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
656
598
free(org_line);
657
599
goto fallback;
658
600
}
661
603
custom_argv = realloc(custom_argv, sizeof(char *)
662
604
* ((unsigned int) custom_argc + 1));
663
605
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
666
608
free(org_line);
667
609
goto fallback;
668
610
}
669
611
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
612
custom_argv[custom_argc] = NULL;
671
613
}
672
614
}
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
615
free(org_line);
682
616
} else {
683
617
/* Check for harmful errors and go to fallback. Other errors might
684
618
not affect opening plugins */
685
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
688
622
goto fallback;
689
623
}
690
624
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
693
627
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;
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
708
633
goto fallback;
709
634
}
710
635
}
711
636
712
637
/* Parse actual command line arguments, to let them override the
713
638
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;
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
728
643
goto fallback;
729
644
}
730
645
742
657
}
743
658
}
744
659
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 */
660
/* Strip permissions down to nobody */
768
661
setgid(gid);
769
662
if(ret == -1){
770
error(0, errno, "setgid");
663
perror("setgid");
771
664
}
772
665
ret = setuid(uid);
773
666
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
683
{
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;
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
691
}
820
692
}
821
693
}
822
694
824
696
825
697
/* Read and execute any executable in the plugin directory*/
826
698
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
699
dirst = readdir(dir);
830
700
831
701
/* All directory entries have been processed */
832
702
if(dirst == NULL){
833
703
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
836
706
goto fallback;
837
707
}
838
708
break;
868
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
739
size_t suf_len = strlen(*suf);
870
740
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
742
== 0)){
873
743
if(debug){
874
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
753
continue;
884
754
}
885
755
}
886
756
887
757
char *filename;
888
758
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
760
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
762
}
896
763
if(ret < 0){
897
error(0, errno, "asprintf");
764
perror("asprintf");
898
765
continue;
899
766
}
900
767
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
768
ret = stat(filename, &st);
902
769
if(ret == -1){
903
error(0, errno, "stat");
770
perror("stat");
904
771
free(filename);
905
772
continue;
906
773
}
907
774
908
775
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
777
if(debug){
912
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
779
" with bad type or mode\n", filename);
918
784
919
785
plugin *p = getplugin(dirst->d_name);
920
786
if(p == NULL){
921
error(0, errno, "getplugin");
787
perror("getplugin");
922
788
free(filename);
923
789
continue;
924
790
}
936
802
if(g != NULL){
937
803
for(char **a = g->argv + 1; *a != NULL; a++){
938
804
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
805
perror("add_argument");
940
806
}
941
807
}
942
808
/* Add global environment variables */
943
809
for(char **e = g->environ; *e != NULL; e++){
944
810
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
811
perror("add_environment");
946
812
}
947
813
}
948
814
}
953
819
if(p->environ[0] != NULL){
954
820
for(char **e = environ; *e != NULL; e++){
955
821
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
822
perror("add_environment");
957
823
}
958
824
}
959
825
}
960
826
961
827
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
828
ret = pipe(pipefd);
963
829
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
966
832
goto fallback;
967
833
}
968
834
/* Ask OS to automatic close the pipe on exec */
969
835
ret = set_cloexec_flag(pipefd[0]);
970
836
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
973
839
goto fallback;
974
840
}
975
841
ret = set_cloexec_flag(pipefd[1]);
976
842
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
979
845
goto fallback;
980
846
}
981
847
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
849
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
988
852
goto fallback;
989
853
}
990
854
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
855
pid_t pid = fork();
995
856
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
998
859
goto fallback;
999
860
}
1000
861
if(pid == 0){
1001
862
/* this is the child process */
1002
863
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
864
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1006
867
}
1007
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
869
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1011
872
}
1012
873
1013
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
875
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1017
878
}
1018
879
1019
880
if(dirfd(dir) < 0){
1023
884
}
1024
885
if(p->environ[0] == NULL){
1025
886
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
887
perror("execv");
888
_exit(EXIT_FAILURE);
1028
889
}
1029
890
} else {
1030
891
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
892
perror("execve");
893
_exit(EXIT_FAILURE);
1033
894
}
1034
895
}
1035
896
/* no return */
1036
897
}
1037
898
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
899
close(pipefd[1]); /* Close unused write end of pipe */
1040
900
free(filename);
1041
901
plugin *new_plugin = getplugin(dirst->d_name);
1042
902
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
905
if(ret < 0){
1048
error(0, errno, "sigprocmask");
906
perror("sigprocmask");
1049
907
}
1050
exitstatus = EX_OSERR;
908
exitstatus = EXIT_FAILURE;
1051
909
goto fallback;
1052
910
}
1053
911
1056
914
1057
915
/* Unblock SIGCHLD so signal handler can be run if this process
1058
916
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
918
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1065
921
goto fallback;
1066
922
}
1067
923
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
924
FD_SET(new_plugin->fd, &rfds_all);
1070
925
1071
926
if(maxfd < new_plugin->fd){
1072
927
maxfd = new_plugin->fd;
1073
928
}
1074
929
}
1075
930
1076
TEMP_FAILURE_RETRY(closedir(dir));
931
closedir(dir);
1077
932
dir = NULL;
1078
933
free_plugin(getplugin(NULL));
1079
934
1092
947
while(plugin_list){
1093
948
fd_set rfds = rfds_all;
1094
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1098
953
goto fallback;
1099
954
}
1100
955
/* OK, now either a process completed, or something can be read
1106
961
if(not WIFEXITED(proc->status)
1107
962
or WEXITSTATUS(proc->status) != 0){
1108
963
/* Bad exit by plugin */
1109
964
1110
965
if(debug){
1111
966
if(WIFEXITED(proc->status)){
1112
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1115
970
WEXITSTATUS(proc->status));
1116
971
} else if(WIFSIGNALED(proc->status)){
1117
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
973
" signal %d\n", proc->name,
1119
974
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
975
WTERMSIG(proc->status));
1122
976
} else if(WCOREDUMP(proc->status)){
1123
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
978
" core\n", proc->name, (intmax_t) (proc->pid));
1126
980
}
1127
981
1128
982
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
983
FD_CLR(proc->fd, &rfds_all);
984
1132
985
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
987
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1140
990
goto fallback;
1141
991
}
1142
992
1145
995
proc = next_plugin;
1146
996
1147
997
/* We are done modifying process list, so unblock signal */
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1151
1000
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1154
1003
goto fallback;
1155
1004
}
1156
1005
1166
1015
bool bret = print_out_password(proc->buffer,
1167
1016
proc->buffer_length);
1168
1017
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1171
1020
}
1172
1021
goto fallback;
1173
1022
}
1174
1023
1175
1024
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1026
/* This process had nothing to say at this time */
1180
1027
proc = proc->next;
1181
1028
continue;
1185
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1033
+ (size_t) BUFFER_SIZE);
1187
1034
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1190
1037
goto fallback;
1191
1038
}
1192
1039
proc->buffer_size += BUFFER_SIZE;
1193
1040
}
1194
1041
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1199
1044
if(sret < 0){
1200
1045
/* Read error from this process; ignore the error */
1201
1046
proc = proc->next;
1209
1054
}
1210
1055
}
1211
1056
}
1212
1213
1057
1058
1214
1059
fallback:
1215
1060
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1062
/* Fallback if all plugins failed, none are found or an error
1219
1063
occured */
1220
1064
bool bret;
1228
1072
}
1229
1073
bret = print_out_password(passwordbuffer, len);
1230
1074
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1233
1077
}
1234
1078
}
1235
1079
1236
1080
/* Restore old signal handler */
1237
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1082
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1241
1085
}
1242
1086
1243
1087
if(custom_argv != NULL){
1258
1102
ret = kill(p->pid, SIGTERM);
1259
1103
if(ret == -1 and errno != ESRCH){
1260
1104
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1105
perror("kill");
1262
1106
}
1263
1107
}
1264
1108
}
1265
1109
1266
1110
/* Wait for any remaining child processes to terminate */
1267
do {
1111
do{
1268
1112
ret = wait(NULL);
1269
1113
} while(ret >= 0);
1270
1114
if(errno != ECHILD){
1271
error(0, errno, "wait");
1115
perror("wait");
1272
1116
}
1273
1117
1274
1118
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0