To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 472
- compare with another revision
- download diff
- download tarball
- view history from revision 472
- Committer: Teddy Hogeborn
- Date: 2011-03-08 19:09:03 UTC
- Revision ID: teddy@fukt.bsnet.se-20110308190903-j499ebtb9bpk31ar
* INSTALL: Updated.
- files added:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
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(),
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() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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
75
69
76
#define BUFFER_SIZE 256
70
77
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
103
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
111
if((p->name == name)
105
112
or (p->name and name and (strcmp(p->name, name) == 0))){
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
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);
111
121
if(new_plugin == NULL){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
118
131
free(new_plugin);
132
errno = e;
119
133
return NULL;
120
134
}
121
135
}
125
139
.disabled = false,
126
140
.next = plugin_list };
127
141
128
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);
129
145
if(new_plugin->argv == NULL){
146
int e = errno;
130
147
free(copy_name);
131
148
free(new_plugin);
149
errno = e;
132
150
return NULL;
133
151
}
134
152
new_plugin->argv[0] = copy_name;
135
153
new_plugin->argv[1] = NULL;
136
154
137
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
158
if(new_plugin->environ == NULL){
159
int e = errno;
139
160
free(copy_name);
140
161
free(new_plugin->argv);
141
162
free(new_plugin);
163
errno = e;
142
164
return NULL;
143
165
}
144
166
new_plugin->environ[0] = NULL;
152
174
static bool add_to_char_array(const char *new, char ***array,
153
175
int *len){
154
176
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
157
181
/* Malloc check */
158
182
if(*array == NULL){
159
183
return false;
160
184
}
161
185
/* Make a copy of the new string */
162
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
163
190
if(copy == NULL){
164
191
return false;
165
192
}
191
218
if(strncmp(*e, def, namelen + 1) == 0){
192
219
/* It already exists */
193
220
if(replace){
194
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);
195
225
if(new == NULL){
196
226
return false;
197
227
}
207
237
/*
208
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
239
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
241
*/
212
242
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
244
/* If reading the flags failed, return error indication now. */
215
245
if(ret < 0){
216
246
return ret;
217
247
}
218
248
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
251
}
221
252
222
253
237
268
/* No child processes */
238
269
break;
239
270
}
240
perror("waitpid");
271
error(0, errno, "waitpid");
241
272
}
242
273
243
274
/* A child exited, find it in process_list */
279
310
}
280
311
free(plugin_node->environ);
281
312
free(plugin_node->buffer);
282
313
283
314
/* Removes the plugin from the singly-linked list */
284
315
if(plugin_node == plugin_list){
285
316
/* First one - simple */
312
343
struct dirent *dirst;
313
344
struct stat st;
314
345
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
346
int ret, maxfd = 0;
316
347
ssize_t sret;
317
intmax_t tmpmax;
318
348
uid_t uid = 65534;
319
349
gid_t gid = 65534;
320
350
bool debug = false;
329
359
sigemptyset(&sigchld_action.sa_mask);
330
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
361
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
334
364
goto fallback;
335
365
}
336
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
367
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
340
370
goto fallback;
341
371
}
342
372
374
404
.doc = "Group ID the plugins will run as", .group = 3 },
375
405
{ .name = "debug", .key = 132,
376
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 },
377
416
{ .name = NULL }
378
417
};
379
418
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
382
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
383
424
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
393
430
}
394
431
}
395
432
}
396
433
break;
397
434
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
435
add_environment(getplugin(NULL), arg, true);
404
436
break;
405
437
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
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;
423
456
}
424
457
}
425
458
}
426
459
break;
427
460
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
461
{
432
462
char *envdef = strchr(arg, ':');
433
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
434
466
break;
435
467
}
436
468
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
439
474
}
475
add_environment(getplugin(arg), envdef, true);
440
476
}
441
477
break;
442
478
case 'd': /* --disable */
443
if(arg != NULL){
479
{
444
480
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
447
483
}
448
p->disabled = true;
449
484
}
450
485
break;
451
486
case 'e': /* --enable */
452
if(arg != NULL){
487
{
453
488
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
456
491
}
457
p->disabled = false;
458
492
}
459
493
break;
460
494
case 128: /* --plugin-dir */
461
495
free(plugindir);
462
496
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
497
break;
467
498
case 129: /* --config-file */
468
499
/* This is already done by parse_opt_config_file() */
469
500
break;
470
501
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
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;
478
508
}
509
uid = (uid_t)tmpmax;
479
510
break;
480
511
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
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;
488
518
}
519
gid = (gid_t)tmpmax;
489
520
break;
490
521
case 132: /* --debug */
491
522
debug = true;
492
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;
493
538
/*
494
539
* When adding more options before this line, remember to also add a
495
540
* "case" to the "parse_opt_config_file" function below.
498
543
/* Cryptsetup always passes an argument, which is an empty
499
544
string if "none" was specified in /etc/crypttab. So if
500
545
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
503
548
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
549
default:
508
550
return ARGP_ERR_UNKNOWN;
509
551
}
510
return 0;
552
return errno; /* Set to 0 at start */
511
553
}
512
554
513
555
/* This option parser is the same as parse_opt() above, except it
515
557
error_t parse_opt_config_file(int key, char *arg,
516
558
__attribute__((unused))
517
559
struct argp_state *state){
560
errno = 0;
518
561
switch(key){
519
562
case 'g': /* --global-options */
520
563
case 'G': /* --global-env */
527
570
case 129: /* --config-file */
528
571
free(argfile);
529
572
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
573
break;
534
574
case 130: /* --userid */
535
575
case 131: /* --groupid */
536
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
537
580
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
581
break;
540
582
default:
541
583
return ARGP_ERR_UNKNOWN;
542
584
}
543
return 0;
585
return errno;
544
586
}
545
587
546
588
struct argp argp = { .options = options,
550
592
551
593
/* Parse using parse_opt_config_file() in order to get the custom
552
594
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
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;
557
609
goto fallback;
558
610
}
559
611
565
617
conffp = fopen(AFILE, "r");
566
618
} else {
567
619
conffp = fopen(argfile, "r");
568
}
620
}
569
621
if(conffp != NULL){
570
622
char *org_line = NULL;
571
623
char *p, *arg, *new_arg, *line;
572
624
size_t size = 0;
573
625
const char whitespace_delims[] = " \r\t\f\v\n";
574
626
const char comment_delim[] = "#";
575
627
576
628
custom_argc = 1;
577
629
custom_argv = malloc(sizeof(char*) * 2);
578
630
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
581
633
goto fallback;
582
634
}
583
635
custom_argv[0] = argv[0];
584
636
custom_argv[1] = NULL;
585
637
586
638
/* for each line in the config file, strip whitespace and ignore
587
639
commented text */
588
640
while(true){
590
642
if(sret == -1){
591
643
break;
592
644
}
593
645
594
646
line = org_line;
595
647
arg = strsep(&line, comment_delim);
596
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
651
}
600
652
new_arg = strdup(p);
601
653
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
604
656
free(org_line);
605
657
goto fallback;
606
658
}
609
661
custom_argv = realloc(custom_argv, sizeof(char *)
610
662
* ((unsigned int) custom_argc + 1));
611
663
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
614
666
free(org_line);
615
667
goto fallback;
616
668
}
617
669
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
619
671
}
620
672
}
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
}
621
681
free(org_line);
622
682
} else {
623
683
/* Check for harmful errors and go to fallback. Other errors might
624
684
not affect opening plugins */
625
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
628
688
goto fallback;
629
689
}
630
690
}
631
/* If there was any arguments from configuration file,
632
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 */
633
693
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
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;
639
708
goto fallback;
640
709
}
641
710
}
642
711
643
712
/* Parse actual command line arguments, to let them override the
644
713
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
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;
649
728
goto fallback;
650
729
}
651
730
666
745
/* Strip permissions down to nobody */
667
746
setgid(gid);
668
747
if(ret == -1){
669
perror("setgid");
748
error(0, errno, "setgid");
670
749
}
671
750
ret = setuid(uid);
672
751
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* 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 */
689
756
{
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
697
}
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;
698
798
}
699
799
}
700
800
702
802
703
803
/* Read and execute any executable in the plugin directory*/
704
804
while(true){
705
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
706
808
707
809
/* All directory entries have been processed */
708
810
if(dirst == NULL){
709
811
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
712
814
goto fallback;
713
815
}
714
816
break;
744
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
847
size_t suf_len = strlen(*suf);
746
848
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
748
850
== 0)){
749
851
if(debug){
750
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
861
continue;
760
862
}
761
863
}
762
864
763
865
char *filename;
764
866
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
766
869
} else {
767
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));
768
873
}
769
874
if(ret < 0){
770
perror("asprintf");
875
error(0, errno, "asprintf");
771
876
continue;
772
877
}
773
878
774
ret = stat(filename, &st);
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
775
880
if(ret == -1){
776
perror("stat");
881
error(0, errno, "stat");
777
882
free(filename);
778
883
continue;
779
884
}
780
885
781
886
/* Ignore non-executable files */
782
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)){
783
889
if(debug){
784
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
891
" with bad type or mode\n", filename);
790
896
791
897
plugin *p = getplugin(dirst->d_name);
792
898
if(p == NULL){
793
perror("getplugin");
899
error(0, errno, "getplugin");
794
900
free(filename);
795
901
continue;
796
902
}
808
914
if(g != NULL){
809
915
for(char **a = g->argv + 1; *a != NULL; a++){
810
916
if(not add_argument(p, *a)){
811
perror("add_argument");
917
error(0, errno, "add_argument");
812
918
}
813
919
}
814
920
/* Add global environment variables */
815
921
for(char **e = g->environ; *e != NULL; e++){
816
922
if(not add_environment(p, *e, false)){
817
perror("add_environment");
923
error(0, errno, "add_environment");
818
924
}
819
925
}
820
926
}
825
931
if(p->environ[0] != NULL){
826
932
for(char **e = environ; *e != NULL; e++){
827
933
if(not add_environment(p, *e, false)){
828
perror("add_environment");
934
error(0, errno, "add_environment");
829
935
}
830
936
}
831
937
}
832
938
833
939
int pipefd[2];
834
ret = pipe(pipefd);
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
835
941
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
838
944
goto fallback;
839
945
}
840
946
/* Ask OS to automatic close the pipe on exec */
841
947
ret = set_cloexec_flag(pipefd[0]);
842
948
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
845
951
goto fallback;
846
952
}
847
953
ret = set_cloexec_flag(pipefd[1]);
848
954
if(ret < 0){
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
851
957
goto fallback;
852
958
}
853
959
/* Block SIGCHLD until process is safely in process list */
854
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));
855
963
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
858
966
goto fallback;
859
967
}
860
968
/* Starting a new process to be watched */
861
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
862
973
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
865
976
goto fallback;
866
977
}
867
978
if(pid == 0){
868
979
/* this is the child process */
869
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
981
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
873
984
}
874
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
986
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
878
989
}
879
990
880
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
992
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
884
995
}
885
996
886
997
if(dirfd(dir) < 0){
890
1001
}
891
1002
if(p->environ[0] == NULL){
892
1003
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
895
1006
}
896
1007
} else {
897
1008
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
900
1011
}
901
1012
}
902
1013
/* no return */
903
1014
}
904
1015
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
906
1018
free(filename);
907
1019
plugin *new_plugin = getplugin(dirst->d_name);
908
1020
if(new_plugin == NULL){
909
perror("getplugin");
910
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)));
911
1025
if(ret < 0){
912
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
913
1027
}
914
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
915
1029
goto fallback;
916
1030
}
917
1031
920
1034
921
1035
/* Unblock SIGCHLD so signal handler can be run if this process
922
1036
has already completed */
923
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));
924
1040
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
927
1043
goto fallback;
928
1044
}
929
1045
930
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
931
1048
932
1049
if(maxfd < new_plugin->fd){
933
1050
maxfd = new_plugin->fd;
934
1051
}
935
1052
}
936
1053
937
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
938
1055
dir = NULL;
1056
free_plugin(getplugin(NULL));
939
1057
940
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1059
if(p->pid != 0){
952
1070
while(plugin_list){
953
1071
fd_set rfds = rfds_all;
954
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
958
1076
goto fallback;
959
1077
}
960
1078
/* OK, now either a process completed, or something can be read
966
1084
if(not WIFEXITED(proc->status)
967
1085
or WEXITSTATUS(proc->status) != 0){
968
1086
/* Bad exit by plugin */
969
1087
970
1088
if(debug){
971
1089
if(WIFEXITED(proc->status)){
972
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
975
1093
WEXITSTATUS(proc->status));
976
1094
} else if(WIFSIGNALED(proc->status)){
977
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
1096
" signal %d: %s\n", proc->name,
979
1097
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status));
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
981
1100
} else if(WCOREDUMP(proc->status)){
982
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
1102
" core\n", proc->name, (intmax_t) (proc->pid));
985
1104
}
986
1105
987
1106
/* Remove the plugin */
988
FD_CLR(proc->fd, &rfds_all);
989
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
990
1110
/* Block signal while modifying process_list */
991
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));
992
1115
if(ret < 0){
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
995
1118
goto fallback;
996
1119
}
997
1120
1000
1123
proc = next_plugin;
1001
1124
1002
1125
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1005
1129
if(ret < 0){
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1008
1132
goto fallback;
1009
1133
}
1010
1134
1020
1144
bool bret = print_out_password(proc->buffer,
1021
1145
proc->buffer_length);
1022
1146
if(not bret){
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1025
1149
}
1026
1150
goto fallback;
1027
1151
}
1028
1152
1029
1153
/* This process has not completed. Does it have any output? */
1030
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 */
1031
1157
/* This process had nothing to say at this time */
1032
1158
proc = proc->next;
1033
1159
continue;
1037
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
1164
+ (size_t) BUFFER_SIZE);
1039
1165
if(proc->buffer == NULL){
1040
perror("malloc");
1041
exitstatus = EXIT_FAILURE;
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1042
1168
goto fallback;
1043
1169
}
1044
1170
proc->buffer_size += BUFFER_SIZE;
1045
1171
}
1046
1172
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1049
1177
if(sret < 0){
1050
1178
/* Read error from this process; ignore the error */
1051
1179
proc = proc->next;
1059
1187
}
1060
1188
}
1061
1189
}
1062
1063
1190
1191
1064
1192
fallback:
1065
1193
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1067
1196
/* Fallback if all plugins failed, none are found or an error
1068
1197
occured */
1069
1198
bool bret;
1077
1206
}
1078
1207
bret = print_out_password(passwordbuffer, len);
1079
1208
if(not bret){
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1082
1211
}
1083
1212
}
1084
1213
1085
1214
/* Restore old signal handler */
1086
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1087
1216
if(ret == -1){
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1090
1219
}
1091
1220
1092
1221
if(custom_argv != NULL){
1107
1236
ret = kill(p->pid, SIGTERM);
1108
1237
if(ret == -1 and errno != ESRCH){
1109
1238
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1239
error(0, errno, "kill");
1111
1240
}
1112
1241
}
1113
1242
}
1114
1243
1115
1244
/* Wait for any remaining child processes to terminate */
1116
do{
1245
do {
1117
1246
ret = wait(NULL);
1118
1247
} while(ret >= 0);
1119
1248
if(errno != ECHILD){
1120
perror("wait");
1249
error(0, errno, "wait");
1121
1250
}
1122
1251
1123
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0