To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.133
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.133
- Committer: Björn Påhlsson
- Date: 2009-02-09 02:05:15 UTC
- mfrom: (237.2.67 mandos)
- 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-20090209020515-t3s2syhptlm0doda
merge
- files removed:
- DBUS-API
- 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,
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
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
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
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;
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 *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;
456
423
}
457
424
}
458
425
}
459
426
break;
460
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
461
431
{
462
432
char *envdef = strchr(arg, ':');
463
433
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
434
break;
467
435
}
468
436
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
474
439
}
475
add_environment(getplugin(arg), envdef, true);
476
440
}
477
441
break;
478
442
case 'd': /* --disable */
479
{
443
if(arg != NULL){
480
444
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
483
447
}
448
p->disabled = true;
484
449
}
485
450
break;
486
451
case 'e': /* --enable */
487
{
452
if(arg != NULL){
488
453
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
491
456
}
457
p->disabled = false;
492
458
}
493
459
break;
494
460
case 128: /* --plugin-dir */
495
461
free(plugindir);
496
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
497
466
break;
498
467
case 129: /* --config-file */
499
468
/* This is already done by parse_opt_config_file() */
500
469
break;
501
470
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;
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;
508
478
}
509
uid = (uid_t)tmpmax;
510
479
break;
511
480
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;
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;
518
488
}
519
gid = (gid_t)tmpmax;
520
489
break;
521
490
case 132: /* --debug */
522
491
debug = true;
523
492
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
493
/*
539
494
* When adding more options before this line, remember to also add a
540
495
* "case" to the "parse_opt_config_file" function below.
543
498
/* Cryptsetup always passes an argument, which is an empty
544
499
string if "none" was specified in /etc/crypttab. So if
545
500
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
549
507
default:
550
508
return ARGP_ERR_UNKNOWN;
551
509
}
552
return errno; /* Set to 0 at start */
510
return 0;
553
511
}
554
512
555
513
/* This option parser is the same as parse_opt() above, except it
557
515
error_t parse_opt_config_file(int key, char *arg,
558
516
__attribute__((unused))
559
517
struct argp_state *state){
560
errno = 0;
561
518
switch(key){
562
519
case 'g': /* --global-options */
563
520
case 'G': /* --global-env */
570
527
case 129: /* --config-file */
571
528
free(argfile);
572
529
argfile = strdup(arg);
573
break;
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
574
534
case 130: /* --userid */
575
535
case 131: /* --groupid */
576
536
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
581
539
break;
582
540
default:
583
541
return ARGP_ERR_UNKNOWN;
584
542
}
585
return errno;
543
return 0;
586
544
}
587
545
588
546
struct argp argp = { .options = options,
592
550
593
551
/* Parse using parse_opt_config_file() in order to get the custom
594
552
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;
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;
609
557
goto fallback;
610
558
}
611
559
617
565
conffp = fopen(AFILE, "r");
618
566
} else {
619
567
conffp = fopen(argfile, "r");
620
}
568
}
621
569
if(conffp != NULL){
622
570
char *org_line = NULL;
623
571
char *p, *arg, *new_arg, *line;
624
572
size_t size = 0;
625
573
const char whitespace_delims[] = " \r\t\f\v\n";
626
574
const char comment_delim[] = "#";
627
575
628
576
custom_argc = 1;
629
577
custom_argv = malloc(sizeof(char*) * 2);
630
578
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
633
581
goto fallback;
634
582
}
635
583
custom_argv[0] = argv[0];
636
584
custom_argv[1] = NULL;
637
585
638
586
/* for each line in the config file, strip whitespace and ignore
639
587
commented text */
640
588
while(true){
642
590
if(sret == -1){
643
591
break;
644
592
}
645
593
646
594
line = org_line;
647
595
arg = strsep(&line, comment_delim);
648
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
599
}
652
600
new_arg = strdup(p);
653
601
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
656
604
free(org_line);
657
605
goto fallback;
658
606
}
661
609
custom_argv = realloc(custom_argv, sizeof(char *)
662
610
* ((unsigned int) custom_argc + 1));
663
611
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
666
614
free(org_line);
667
615
goto fallback;
668
616
}
669
617
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
671
619
}
672
620
}
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
621
free(org_line);
682
622
} else {
683
623
/* Check for harmful errors and go to fallback. Other errors might
684
624
not affect opening plugins */
685
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
688
628
goto fallback;
689
629
}
690
630
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
693
633
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;
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;
708
639
goto fallback;
709
640
}
710
641
}
711
642
712
643
/* Parse actual command line arguments, to let them override the
713
644
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;
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;
728
649
goto fallback;
729
650
}
730
651
745
666
/* Strip permissions down to nobody */
746
667
setgid(gid);
747
668
if(ret == -1){
748
error(0, errno, "setgid");
669
perror("setgid");
749
670
}
750
671
ret = setuid(uid);
751
672
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
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 */
756
689
{
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;
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
}
798
698
}
799
699
}
800
700
802
702
803
703
/* Read and execute any executable in the plugin directory*/
804
704
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
705
dirst = readdir(dir);
808
706
809
707
/* All directory entries have been processed */
810
708
if(dirst == NULL){
811
709
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
814
712
goto fallback;
815
713
}
816
714
break;
846
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
745
size_t suf_len = strlen(*suf);
848
746
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
748
== 0)){
851
749
if(debug){
852
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
861
759
continue;
862
760
}
863
761
}
864
762
865
763
char *filename;
866
764
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
869
766
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
873
768
}
874
769
if(ret < 0){
875
error(0, errno, "asprintf");
770
perror("asprintf");
876
771
continue;
877
772
}
878
773
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
ret = stat(filename, &st);
880
775
if(ret == -1){
881
error(0, errno, "stat");
776
perror("stat");
882
777
free(filename);
883
778
continue;
884
779
}
885
780
886
781
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
783
if(debug){
890
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
785
" with bad type or mode\n", filename);
896
790
897
791
plugin *p = getplugin(dirst->d_name);
898
792
if(p == NULL){
899
error(0, errno, "getplugin");
793
perror("getplugin");
900
794
free(filename);
901
795
continue;
902
796
}
914
808
if(g != NULL){
915
809
for(char **a = g->argv + 1; *a != NULL; a++){
916
810
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
811
perror("add_argument");
918
812
}
919
813
}
920
814
/* Add global environment variables */
921
815
for(char **e = g->environ; *e != NULL; e++){
922
816
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
817
perror("add_environment");
924
818
}
925
819
}
926
820
}
931
825
if(p->environ[0] != NULL){
932
826
for(char **e = environ; *e != NULL; e++){
933
827
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
828
perror("add_environment");
935
829
}
936
830
}
937
831
}
938
832
939
833
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
834
ret = pipe(pipefd);
941
835
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
944
838
goto fallback;
945
839
}
946
840
/* Ask OS to automatic close the pipe on exec */
947
841
ret = set_cloexec_flag(pipefd[0]);
948
842
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
951
845
goto fallback;
952
846
}
953
847
ret = set_cloexec_flag(pipefd[1]);
954
848
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
957
851
goto fallback;
958
852
}
959
853
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
855
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
966
858
goto fallback;
967
859
}
968
860
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
973
862
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
976
865
goto fallback;
977
866
}
978
867
if(pid == 0){
979
868
/* this is the child process */
980
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
870
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
984
873
}
985
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
875
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
989
878
}
990
879
991
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
881
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
882
perror("dup2");
883
_exit(EXIT_FAILURE);
995
884
}
996
885
997
886
if(dirfd(dir) < 0){
1001
890
}
1002
891
if(p->environ[0] == NULL){
1003
892
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
893
perror("execv");
894
_exit(EXIT_FAILURE);
1006
895
}
1007
896
} else {
1008
897
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
898
perror("execve");
899
_exit(EXIT_FAILURE);
1011
900
}
1012
901
}
1013
902
/* no return */
1014
903
}
1015
904
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
905
close(pipefd[1]); /* Close unused write end of pipe */
1018
906
free(filename);
1019
907
plugin *new_plugin = getplugin(dirst->d_name);
1020
908
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
911
if(ret < 0){
1026
error(0, errno, "sigprocmask");
912
perror("sigprocmask");
1027
913
}
1028
exitstatus = EX_OSERR;
914
exitstatus = EXIT_FAILURE;
1029
915
goto fallback;
1030
916
}
1031
917
1034
920
1035
921
/* Unblock SIGCHLD so signal handler can be run if this process
1036
922
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
924
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1043
927
goto fallback;
1044
928
}
1045
929
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
930
FD_SET(new_plugin->fd, &rfds_all);
1048
931
1049
932
if(maxfd < new_plugin->fd){
1050
933
maxfd = new_plugin->fd;
1051
934
}
1052
935
}
1053
936
1054
TEMP_FAILURE_RETRY(closedir(dir));
937
closedir(dir);
1055
938
dir = NULL;
1056
939
free_plugin(getplugin(NULL));
1057
940
1070
953
while(plugin_list){
1071
954
fd_set rfds = rfds_all;
1072
955
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
956
if(select_ret == -1){
957
perror("select");
958
exitstatus = EXIT_FAILURE;
1076
959
goto fallback;
1077
960
}
1078
961
/* OK, now either a process completed, or something can be read
1084
967
if(not WIFEXITED(proc->status)
1085
968
or WEXITSTATUS(proc->status) != 0){
1086
969
/* Bad exit by plugin */
1087
970
1088
971
if(debug){
1089
972
if(WIFEXITED(proc->status)){
1090
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1093
976
WEXITSTATUS(proc->status));
1094
977
} else if(WIFSIGNALED(proc->status)){
1095
978
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
979
" signal %d\n", proc->name,
1097
980
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
981
WTERMSIG(proc->status));
1100
982
} else if(WCOREDUMP(proc->status)){
1101
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
984
" core\n", proc->name, (intmax_t) (proc->pid));
1104
986
}
1105
987
1106
988
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
989
FD_CLR(proc->fd, &rfds_all);
990
1110
991
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
993
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
994
perror("sigprocmask");
995
exitstatus = EXIT_FAILURE;
1118
996
goto fallback;
1119
997
}
1120
998
1123
1001
proc = next_plugin;
1124
1002
1125
1003
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1129
1006
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1007
perror("sigprocmask");
1008
exitstatus = EXIT_FAILURE;
1132
1009
goto fallback;
1133
1010
}
1134
1011
1144
1021
bool bret = print_out_password(proc->buffer,
1145
1022
proc->buffer_length);
1146
1023
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1024
perror("print_out_password");
1025
exitstatus = EXIT_FAILURE;
1149
1026
}
1150
1027
goto fallback;
1151
1028
}
1152
1029
1153
1030
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1032
/* This process had nothing to say at this time */
1158
1033
proc = proc->next;
1159
1034
continue;
1163
1038
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1039
+ (size_t) BUFFER_SIZE);
1165
1040
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1041
perror("malloc");
1042
exitstatus = EXIT_FAILURE;
1168
1043
goto fallback;
1169
1044
}
1170
1045
proc->buffer_size += BUFFER_SIZE;
1171
1046
}
1172
1047
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1177
1050
if(sret < 0){
1178
1051
/* Read error from this process; ignore the error */
1179
1052
proc = proc->next;
1187
1060
}
1188
1061
}
1189
1062
}
1190
1191
1063
1064
1192
1065
fallback:
1193
1066
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1068
/* Fallback if all plugins failed, none are found or an error
1197
1069
occured */
1198
1070
bool bret;
1206
1078
}
1207
1079
bret = print_out_password(passwordbuffer, len);
1208
1080
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1081
perror("print_out_password");
1082
exitstatus = EXIT_FAILURE;
1211
1083
}
1212
1084
}
1213
1085
1214
1086
/* Restore old signal handler */
1215
1087
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1088
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1089
perror("sigaction");
1090
exitstatus = EXIT_FAILURE;
1219
1091
}
1220
1092
1221
1093
if(custom_argv != NULL){
1236
1108
ret = kill(p->pid, SIGTERM);
1237
1109
if(ret == -1 and errno != ESRCH){
1238
1110
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1111
perror("kill");
1240
1112
}
1241
1113
}
1242
1114
}
1243
1115
1244
1116
/* Wait for any remaining child processes to terminate */
1245
do {
1117
do{
1246
1118
ret = wait(NULL);
1247
1119
} while(ret >= 0);
1248
1120
if(errno != ECHILD){
1249
error(0, errno, "wait");
1121
perror("wait");
1250
1122
}
1251
1123
1252
1124
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0