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- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
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,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#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() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
79
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
73
81
74
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
101
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
110
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
104
if((p->name == name)
112
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
107
}
115
108
}
116
109
/* 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);
110
plugin *new_plugin = malloc(sizeof(plugin));
121
111
if(new_plugin == NULL){
122
112
return NULL;
123
113
}
124
114
char *copy_name = NULL;
125
115
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
129
117
if(copy_name == NULL){
130
int e = errno;
131
118
free(new_plugin);
132
errno = e;
133
119
return NULL;
134
120
}
135
121
}
139
125
.disabled = false,
140
126
.next = plugin_list };
141
127
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
145
129
if(new_plugin->argv == NULL){
146
int e = errno;
147
130
free(copy_name);
148
131
free(new_plugin);
149
errno = e;
150
132
return NULL;
151
133
}
152
134
new_plugin->argv[0] = copy_name;
153
135
new_plugin->argv[1] = NULL;
154
136
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
158
138
if(new_plugin->environ == NULL){
159
int e = errno;
160
139
free(copy_name);
161
140
free(new_plugin->argv);
162
141
free(new_plugin);
163
errno = e;
164
142
return NULL;
165
143
}
166
144
new_plugin->environ[0] = NULL;
174
152
static bool add_to_char_array(const char *new, char ***array,
175
153
int *len){
176
154
/* 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);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
181
157
/* Malloc check */
182
158
if(*array == NULL){
183
159
return false;
184
160
}
185
161
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
190
163
if(copy == NULL){
191
164
return false;
192
165
}
218
191
if(strncmp(*e, def, namelen + 1) == 0){
219
192
/* It already exists */
220
193
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
225
195
if(new == NULL){
226
196
return false;
227
197
}
237
207
/*
238
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
209
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
211
*/
242
212
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
244
214
/* If reading the flags failed, return error indication now. */
245
215
if(ret < 0){
246
216
return ret;
247
217
}
248
218
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
220
}
252
221
253
222
268
237
/* No child processes */
269
238
break;
270
239
}
271
error(0, errno, "waitpid");
240
perror("waitpid");
272
241
}
273
242
274
243
/* A child exited, find it in process_list */
310
279
}
311
280
free(plugin_node->environ);
312
281
free(plugin_node->buffer);
313
282
314
283
/* Removes the plugin from the singly-linked list */
315
284
if(plugin_node == plugin_list){
316
285
/* First one - simple */
343
312
struct dirent *dirst;
344
313
struct stat st;
345
314
fd_set rfds_all;
346
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
347
316
ssize_t sret;
317
intmax_t tmpmax;
348
318
uid_t uid = 65534;
349
319
gid_t gid = 65534;
350
320
bool debug = false;
359
329
sigemptyset(&sigchld_action.sa_mask);
360
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
331
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
364
334
goto fallback;
365
335
}
366
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
337
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
370
340
goto fallback;
371
341
}
372
342
404
374
.doc = "Group ID the plugins will run as", .group = 3 },
405
375
{ .name = "debug", .key = 132,
406
376
.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
377
{ .name = NULL }
417
378
};
418
379
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
421
382
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
383
case 'g': /* --global-options */
425
{
384
if(arg != NULL){
426
385
char *plugin_option;
427
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
388
continue;
389
}
428
390
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
430
393
}
431
394
}
432
395
}
433
396
break;
434
397
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
436
404
break;
437
405
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;
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
456
416
}
457
417
}
458
418
}
459
419
break;
460
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
461
424
{
462
425
char *envdef = strchr(arg, ':');
463
426
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
427
break;
467
428
}
468
429
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
474
432
}
475
add_environment(getplugin(arg), envdef, true);
476
433
}
477
434
break;
478
435
case 'd': /* --disable */
479
{
436
if(arg != NULL){
480
437
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
483
440
}
441
p->disabled = true;
484
442
}
485
443
break;
486
444
case 'e': /* --enable */
487
{
445
if(arg != NULL){
488
446
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
491
449
}
450
p->disabled = false;
492
451
}
493
452
break;
494
453
case 128: /* --plugin-dir */
495
454
free(plugindir);
496
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
497
459
break;
498
460
case 129: /* --config-file */
499
461
/* This is already done by parse_opt_config_file() */
500
462
break;
501
463
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;
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
508
471
}
509
uid = (uid_t)tmpmax;
510
472
break;
511
473
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;
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
518
481
}
519
gid = (gid_t)tmpmax;
520
482
break;
521
483
case 132: /* --debug */
522
484
debug = true;
523
485
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
486
/*
539
487
* When adding more options before this line, remember to also add a
540
488
* "case" to the "parse_opt_config_file" function below.
543
491
/* Cryptsetup always passes an argument, which is an empty
544
492
string if "none" was specified in /etc/crypttab. So if
545
493
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
549
500
default:
550
501
return ARGP_ERR_UNKNOWN;
551
502
}
552
return errno; /* Set to 0 at start */
503
return 0;
553
504
}
554
505
555
506
/* This option parser is the same as parse_opt() above, except it
557
508
error_t parse_opt_config_file(int key, char *arg,
558
509
__attribute__((unused))
559
510
struct argp_state *state){
560
errno = 0;
561
511
switch(key){
562
512
case 'g': /* --global-options */
563
513
case 'G': /* --global-env */
570
520
case 129: /* --config-file */
571
521
free(argfile);
572
522
argfile = strdup(arg);
573
break;
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
574
527
case 130: /* --userid */
575
528
case 131: /* --groupid */
576
529
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
530
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
581
532
break;
582
533
default:
583
534
return ARGP_ERR_UNKNOWN;
584
535
}
585
return errno;
536
return 0;
586
537
}
587
538
588
539
struct argp argp = { .options = options,
592
543
593
544
/* Parse using parse_opt_config_file() in order to get the custom
594
545
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;
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
548
fprintf(stderr, "Unknown error while parsing arguments\n");
549
exitstatus = EXIT_FAILURE;
609
550
goto fallback;
610
551
}
611
552
617
558
conffp = fopen(AFILE, "r");
618
559
} else {
619
560
conffp = fopen(argfile, "r");
620
}
561
}
621
562
if(conffp != NULL){
622
563
char *org_line = NULL;
623
564
char *p, *arg, *new_arg, *line;
624
565
size_t size = 0;
625
566
const char whitespace_delims[] = " \r\t\f\v\n";
626
567
const char comment_delim[] = "#";
627
568
628
569
custom_argc = 1;
629
570
custom_argv = malloc(sizeof(char*) * 2);
630
571
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
572
perror("malloc");
573
exitstatus = EXIT_FAILURE;
633
574
goto fallback;
634
575
}
635
576
custom_argv[0] = argv[0];
636
577
custom_argv[1] = NULL;
637
578
638
579
/* for each line in the config file, strip whitespace and ignore
639
580
commented text */
640
581
while(true){
642
583
if(sret == -1){
643
584
break;
644
585
}
645
586
646
587
line = org_line;
647
588
arg = strsep(&line, comment_delim);
648
589
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
592
}
652
593
new_arg = strdup(p);
653
594
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
595
perror("strdup");
596
exitstatus = EXIT_FAILURE;
656
597
free(org_line);
657
598
goto fallback;
658
599
}
661
602
custom_argv = realloc(custom_argv, sizeof(char *)
662
603
* ((unsigned int) custom_argc + 1));
663
604
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
605
perror("realloc");
606
exitstatus = EXIT_FAILURE;
666
607
free(org_line);
667
608
goto fallback;
668
609
}
669
610
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
611
custom_argv[custom_argc] = NULL;
671
612
}
672
613
}
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
614
free(org_line);
682
615
} else {
683
616
/* Check for harmful errors and go to fallback. Other errors might
684
617
not affect opening plugins */
685
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
619
perror("fopen");
620
exitstatus = EXIT_FAILURE;
688
621
goto fallback;
689
622
}
690
623
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
693
626
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;
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
630
fprintf(stderr, "Unknown error while parsing arguments\n");
631
exitstatus = EXIT_FAILURE;
708
632
goto fallback;
709
633
}
710
634
}
711
635
712
636
/* Parse actual command line arguments, to let them override the
713
637
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;
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
728
642
goto fallback;
729
643
}
730
644
742
656
}
743
657
}
744
658
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 */
659
/* Strip permissions down to nobody */
768
660
setgid(gid);
769
661
if(ret == -1){
770
error(0, errno, "setgid");
662
perror("setgid");
771
663
}
772
664
ret = setuid(uid);
773
665
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
666
perror("setuid");
667
}
668
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
673
}
674
675
if(dir == NULL){
676
perror("Could not open plugin dir");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
680
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
778
682
{
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;
683
int dir_fd = dirfd(dir);
684
if(dir_fd >= 0){
685
ret = set_cloexec_flag(dir_fd);
686
if(ret < 0){
687
perror("set_cloexec_flag");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
820
691
}
821
692
}
822
693
824
695
825
696
/* Read and execute any executable in the plugin directory*/
826
697
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
698
dirst = readdir(dir);
830
699
831
700
/* All directory entries have been processed */
832
701
if(dirst == NULL){
833
702
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
703
perror("readdir");
704
exitstatus = EXIT_FAILURE;
836
705
goto fallback;
837
706
}
838
707
break;
868
737
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
738
size_t suf_len = strlen(*suf);
870
739
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
740
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
872
741
== 0)){
873
742
if(debug){
874
743
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
883
752
continue;
884
753
}
885
754
}
886
755
887
756
char *filename;
888
757
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
891
759
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
895
761
}
896
762
if(ret < 0){
897
error(0, errno, "asprintf");
763
perror("asprintf");
898
764
continue;
899
765
}
900
766
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
767
ret = stat(filename, &st);
902
768
if(ret == -1){
903
error(0, errno, "stat");
769
perror("stat");
904
770
free(filename);
905
771
continue;
906
772
}
907
773
908
774
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
911
776
if(debug){
912
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
778
" with bad type or mode\n", filename);
918
783
919
784
plugin *p = getplugin(dirst->d_name);
920
785
if(p == NULL){
921
error(0, errno, "getplugin");
786
perror("getplugin");
922
787
free(filename);
923
788
continue;
924
789
}
936
801
if(g != NULL){
937
802
for(char **a = g->argv + 1; *a != NULL; a++){
938
803
if(not add_argument(p, *a)){
939
error(0, errno, "add_argument");
804
perror("add_argument");
940
805
}
941
806
}
942
807
/* Add global environment variables */
943
808
for(char **e = g->environ; *e != NULL; e++){
944
809
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
810
perror("add_environment");
946
811
}
947
812
}
948
813
}
953
818
if(p->environ[0] != NULL){
954
819
for(char **e = environ; *e != NULL; e++){
955
820
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
821
perror("add_environment");
957
822
}
958
823
}
959
824
}
960
825
961
826
int pipefd[2];
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
827
ret = pipe(pipefd);
963
828
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
829
perror("pipe");
830
exitstatus = EXIT_FAILURE;
966
831
goto fallback;
967
832
}
968
833
/* Ask OS to automatic close the pipe on exec */
969
834
ret = set_cloexec_flag(pipefd[0]);
970
835
if(ret < 0){
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
836
perror("set_cloexec_flag");
837
exitstatus = EXIT_FAILURE;
973
838
goto fallback;
974
839
}
975
840
ret = set_cloexec_flag(pipefd[1]);
976
841
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
979
844
goto fallback;
980
845
}
981
846
/* 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));
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
985
848
if(ret < 0){
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
988
851
goto fallback;
989
852
}
990
853
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
854
pid_t pid = fork();
995
855
if(pid == -1){
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
856
perror("fork");
857
exitstatus = EXIT_FAILURE;
998
858
goto fallback;
999
859
}
1000
860
if(pid == 0){
1001
861
/* this is the child process */
1002
862
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
863
if(ret < 0){
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
864
perror("sigaction");
865
_exit(EXIT_FAILURE);
1006
866
}
1007
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1008
868
if(ret < 0){
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
869
perror("sigprocmask");
870
_exit(EXIT_FAILURE);
1011
871
}
1012
872
1013
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1014
874
if(ret == -1){
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
875
perror("dup2");
876
_exit(EXIT_FAILURE);
1017
877
}
1018
878
1019
879
if(dirfd(dir) < 0){
1023
883
}
1024
884
if(p->environ[0] == NULL){
1025
885
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
886
perror("execv");
887
_exit(EXIT_FAILURE);
1028
888
}
1029
889
} else {
1030
890
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
891
perror("execve");
892
_exit(EXIT_FAILURE);
1033
893
}
1034
894
}
1035
895
/* no return */
1036
896
}
1037
897
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
898
close(pipefd[1]); /* Close unused write end of pipe */
1040
899
free(filename);
1041
900
plugin *new_plugin = getplugin(dirst->d_name);
1042
901
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)));
902
perror("getplugin");
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1047
904
if(ret < 0){
1048
error(0, errno, "sigprocmask");
905
perror("sigprocmask");
1049
906
}
1050
exitstatus = EX_OSERR;
907
exitstatus = EXIT_FAILURE;
1051
908
goto fallback;
1052
909
}
1053
910
1056
913
1057
914
/* Unblock SIGCHLD so signal handler can be run if this process
1058
915
has already completed */
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
917
if(ret < 0){
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
918
perror("sigprocmask");
919
exitstatus = EXIT_FAILURE;
1065
920
goto fallback;
1066
921
}
1067
922
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
923
FD_SET(new_plugin->fd, &rfds_all);
1070
924
1071
925
if(maxfd < new_plugin->fd){
1072
926
maxfd = new_plugin->fd;
1073
927
}
1074
928
}
1075
929
1076
TEMP_FAILURE_RETRY(closedir(dir));
930
closedir(dir);
1077
931
dir = NULL;
1078
932
free_plugin(getplugin(NULL));
1079
933
1092
946
while(plugin_list){
1093
947
fd_set rfds = rfds_all;
1094
948
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;
949
if(select_ret == -1){
950
perror("select");
951
exitstatus = EXIT_FAILURE;
1098
952
goto fallback;
1099
953
}
1100
954
/* OK, now either a process completed, or something can be read
1106
960
if(not WIFEXITED(proc->status)
1107
961
or WEXITSTATUS(proc->status) != 0){
1108
962
/* Bad exit by plugin */
1109
963
1110
964
if(debug){
1111
965
if(WIFEXITED(proc->status)){
1112
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1115
969
WEXITSTATUS(proc->status));
1116
970
} else if(WIFSIGNALED(proc->status)){
1117
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
972
" signal %d\n", proc->name,
1119
973
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
974
WTERMSIG(proc->status));
1122
975
} else if(WCOREDUMP(proc->status)){
1123
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
977
" core\n", proc->name, (intmax_t) (proc->pid));
1126
979
}
1127
980
1128
981
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
982
FD_CLR(proc->fd, &rfds_all);
983
1132
984
/* Block signal while modifying process_list */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1137
986
if(ret < 0){
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
987
perror("sigprocmask");
988
exitstatus = EXIT_FAILURE;
1140
989
goto fallback;
1141
990
}
1142
991
1145
994
proc = next_plugin;
1146
995
1147
996
/* 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)));
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
1151
999
if(ret < 0){
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1000
perror("sigprocmask");
1001
exitstatus = EXIT_FAILURE;
1154
1002
goto fallback;
1155
1003
}
1156
1004
1166
1014
bool bret = print_out_password(proc->buffer,
1167
1015
proc->buffer_length);
1168
1016
if(not bret){
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1017
perror("print_out_password");
1018
exitstatus = EXIT_FAILURE;
1171
1019
}
1172
1020
goto fallback;
1173
1021
}
1174
1022
1175
1023
/* 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 */
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1025
/* This process had nothing to say at this time */
1180
1026
proc = proc->next;
1181
1027
continue;
1185
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
1032
+ (size_t) BUFFER_SIZE);
1187
1033
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1034
perror("malloc");
1035
exitstatus = EXIT_FAILURE;
1190
1036
goto fallback;
1191
1037
}
1192
1038
proc->buffer_size += BUFFER_SIZE;
1193
1039
}
1194
1040
/* Read from the process */
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1199
1043
if(sret < 0){
1200
1044
/* Read error from this process; ignore the error */
1201
1045
proc = proc->next;
1209
1053
}
1210
1054
}
1211
1055
}
1212
1213
1056
1057
1214
1058
fallback:
1215
1059
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1218
1061
/* Fallback if all plugins failed, none are found or an error
1219
1062
occured */
1220
1063
bool bret;
1228
1071
}
1229
1072
bret = print_out_password(passwordbuffer, len);
1230
1073
if(not bret){
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1074
perror("print_out_password");
1075
exitstatus = EXIT_FAILURE;
1233
1076
}
1234
1077
}
1235
1078
1236
1079
/* Restore old signal handler */
1237
1080
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1238
1081
if(ret == -1){
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1082
perror("sigaction");
1083
exitstatus = EXIT_FAILURE;
1241
1084
}
1242
1085
1243
1086
if(custom_argv != NULL){
1258
1101
ret = kill(p->pid, SIGTERM);
1259
1102
if(ret == -1 and errno != ESRCH){
1260
1103
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1104
perror("kill");
1262
1105
}
1263
1106
}
1264
1107
}
1265
1108
1266
1109
/* Wait for any remaining child processes to terminate */
1267
do {
1110
do{
1268
1111
ret = wait(NULL);
1269
1112
} while(ret >= 0);
1270
1113
if(errno != ECHILD){
1271
error(0, errno, "wait");
1114
perror("wait");
1272
1115
}
1273
1116
1274
1117
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0