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- Committer: Teddy Hogeborn
- Date: 2014-01-21 21:37:44 UTC
- mfrom: (237.4.39 release)
- Revision ID: teddy@recompile.se-20140121213744-xu4odolayuxn78wi
Merge from release branch.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
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,
65
67
SIG_UNBLOCK, kill(), sig_atomic_t
66
68
*/
67
69
#include <errno.h> /* errno, EBADF */
68
#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() */
69
75
70
76
#define BUFFER_SIZE 256
71
77
73
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
80
75
81
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
83
78
84
typedef struct plugin{
79
85
char *name; /* can be NULL or any plugin name */
82
88
char **environ;
83
89
int envc;
84
90
bool disabled;
85
91
86
92
/* Variables used for running processes*/
87
93
pid_t pid;
88
94
int fd;
100
106
/* Gets an existing plugin based on name,
101
107
or if none is found, creates a new one */
102
108
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
104
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
111
if((p->name == name)
106
112
or (p->name and name and (strcmp(p->name, name) == 0))){
108
114
}
109
115
}
110
116
/* Create a new plugin */
111
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);
112
121
if(new_plugin == NULL){
113
122
return NULL;
114
123
}
115
124
char *copy_name = NULL;
116
125
if(name != NULL){
117
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
118
129
if(copy_name == NULL){
130
int e = errno;
119
131
free(new_plugin);
132
errno = e;
120
133
return NULL;
121
134
}
122
135
}
126
139
.disabled = false,
127
140
.next = plugin_list };
128
141
129
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);
130
145
if(new_plugin->argv == NULL){
146
int e = errno;
131
147
free(copy_name);
132
148
free(new_plugin);
149
errno = e;
133
150
return NULL;
134
151
}
135
152
new_plugin->argv[0] = copy_name;
136
153
new_plugin->argv[1] = NULL;
137
154
138
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
139
158
if(new_plugin->environ == NULL){
159
int e = errno;
140
160
free(copy_name);
141
161
free(new_plugin->argv);
142
162
free(new_plugin);
163
errno = e;
143
164
return NULL;
144
165
}
145
166
new_plugin->environ[0] = NULL;
150
171
}
151
172
152
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
153
175
static bool add_to_char_array(const char *new, char ***array,
154
176
int *len){
155
177
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
158
182
/* Malloc check */
159
183
if(*array == NULL){
160
184
return false;
161
185
}
162
186
/* Make a copy of the new string */
163
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
164
191
if(copy == NULL){
165
192
return false;
166
193
}
173
200
}
174
201
175
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
176
204
static bool add_argument(plugin *p, const char *arg){
177
205
if(p == NULL){
178
206
return false;
181
209
}
182
210
183
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
184
213
static bool add_environment(plugin *p, const char *def, bool replace){
185
214
if(p == NULL){
186
215
return false;
192
221
if(strncmp(*e, def, namelen + 1) == 0){
193
222
/* It already exists */
194
223
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
196
228
if(new == NULL){
197
229
return false;
198
230
}
208
240
/*
209
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
242
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
244
*/
213
245
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
247
/* If reading the flags failed, return error indication now. */
216
248
if(ret < 0){
217
249
return ret;
218
250
}
219
251
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
221
254
}
222
255
223
256
238
271
/* No child processes */
239
272
break;
240
273
}
241
perror("waitpid");
274
error(0, errno, "waitpid");
242
275
}
243
276
244
277
/* A child exited, find it in process_list */
256
289
}
257
290
258
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
259
293
static bool print_out_password(const char *buffer, size_t length){
260
294
ssize_t ret;
261
295
for(size_t written = 0; written < length; written += (size_t)ret){
269
303
}
270
304
271
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
272
307
static void free_plugin(plugin *plugin_node){
273
308
274
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
280
315
}
281
316
free(plugin_node->environ);
282
317
free(plugin_node->buffer);
283
318
284
319
/* Removes the plugin from the singly-linked list */
285
320
if(plugin_node == plugin_list){
286
321
/* First one - simple */
313
348
struct dirent *dirst;
314
349
struct stat st;
315
350
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
351
int ret, maxfd = 0;
317
352
ssize_t sret;
318
intmax_t tmpmax;
319
353
uid_t uid = 65534;
320
354
gid_t gid = 65534;
321
355
bool debug = false;
330
364
sigemptyset(&sigchld_action.sa_mask);
331
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
366
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
335
369
goto fallback;
336
370
}
337
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
372
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
341
375
goto fallback;
342
376
}
343
377
375
409
.doc = "Group ID the plugins will run as", .group = 3 },
376
410
{ .name = "debug", .key = 132,
377
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
378
421
{ .name = NULL }
379
422
};
380
423
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
383
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
384
430
case 'g': /* --global-options */
385
if(arg != NULL){
431
{
386
432
char *plugin_option;
387
433
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
434
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
435
break;
394
436
}
395
437
}
396
438
}
397
439
break;
398
440
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
441
add_environment(getplugin(NULL), arg, true);
405
442
break;
406
443
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
417
462
}
418
463
}
419
464
}
420
465
break;
421
466
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
467
{
426
468
char *envdef = strchr(arg, ':');
427
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
428
472
break;
429
473
}
430
474
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
433
480
}
481
add_environment(getplugin(arg), envdef, true);
434
482
}
435
483
break;
436
484
case 'd': /* --disable */
437
if(arg != NULL){
485
{
438
486
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
441
489
}
442
p->disabled = true;
443
490
}
444
491
break;
445
492
case 'e': /* --enable */
446
if(arg != NULL){
493
{
447
494
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
450
497
}
451
p->disabled = false;
452
498
}
453
499
break;
454
500
case 128: /* --plugin-dir */
455
501
free(plugindir);
456
502
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
503
break;
461
504
case 129: /* --config-file */
462
505
/* This is already done by parse_opt_config_file() */
463
506
break;
464
507
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
472
514
}
515
uid = (uid_t)tmp_id;
473
516
break;
474
517
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
482
524
}
525
gid = (gid_t)tmp_id;
483
526
break;
484
527
case 132: /* --debug */
485
528
debug = true;
486
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
487
544
/*
488
545
* When adding more options before this line, remember to also add a
489
546
* "case" to the "parse_opt_config_file" function below.
492
549
/* Cryptsetup always passes an argument, which is an empty
493
550
string if "none" was specified in /etc/crypttab. So if
494
551
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
497
554
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
555
default:
502
556
return ARGP_ERR_UNKNOWN;
503
557
}
504
return 0;
558
return errno; /* Set to 0 at start */
505
559
}
506
560
507
561
/* This option parser is the same as parse_opt() above, except it
509
563
error_t parse_opt_config_file(int key, char *arg,
510
564
__attribute__((unused))
511
565
struct argp_state *state){
566
errno = 0;
512
567
switch(key){
513
568
case 'g': /* --global-options */
514
569
case 'G': /* --global-env */
521
576
case 129: /* --config-file */
522
577
free(argfile);
523
578
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
579
break;
528
580
case 130: /* --userid */
529
581
case 131: /* --groupid */
530
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
531
586
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
587
break;
534
588
default:
535
589
return ARGP_ERR_UNKNOWN;
536
590
}
537
return 0;
591
return errno;
538
592
}
539
593
540
594
struct argp argp = { .options = options,
544
598
545
599
/* Parse using parse_opt_config_file() in order to get the custom
546
600
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
551
615
goto fallback;
552
616
}
553
617
559
623
conffp = fopen(AFILE, "r");
560
624
} else {
561
625
conffp = fopen(argfile, "r");
562
}
626
}
563
627
if(conffp != NULL){
564
628
char *org_line = NULL;
565
629
char *p, *arg, *new_arg, *line;
566
630
size_t size = 0;
567
631
const char whitespace_delims[] = " \r\t\f\v\n";
568
632
const char comment_delim[] = "#";
569
633
570
634
custom_argc = 1;
571
635
custom_argv = malloc(sizeof(char*) * 2);
572
636
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
575
639
goto fallback;
576
640
}
577
641
custom_argv[0] = argv[0];
578
642
custom_argv[1] = NULL;
579
643
580
644
/* for each line in the config file, strip whitespace and ignore
581
645
commented text */
582
646
while(true){
584
648
if(sret == -1){
585
649
break;
586
650
}
587
651
588
652
line = org_line;
589
653
arg = strsep(&line, comment_delim);
590
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
657
}
594
658
new_arg = strdup(p);
595
659
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
598
662
free(org_line);
599
663
goto fallback;
600
664
}
603
667
custom_argv = realloc(custom_argv, sizeof(char *)
604
668
* ((unsigned int) custom_argc + 1));
605
669
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
608
672
free(org_line);
609
673
goto fallback;
610
674
}
611
675
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
613
677
}
614
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
615
687
free(org_line);
616
688
} else {
617
689
/* Check for harmful errors and go to fallback. Other errors might
618
690
not affect opening plugins */
619
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
622
694
goto fallback;
623
695
}
624
696
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
627
699
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
633
714
goto fallback;
634
715
}
635
716
}
636
717
637
718
/* Parse actual command line arguments, to let them override the
638
719
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
643
734
goto fallback;
644
735
}
645
736
657
748
}
658
749
}
659
750
660
/* Strip permissions down to nobody */
661
setgid(gid);
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
ret = setgid(gid);
662
775
if(ret == -1){
663
perror("setgid");
776
error(0, errno, "setgid");
664
777
}
665
778
ret = setuid(uid);
666
779
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
683
784
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
691
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
692
826
}
693
827
}
694
828
696
830
697
831
/* Read and execute any executable in the plugin directory*/
698
832
while(true){
699
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
700
836
701
837
/* All directory entries have been processed */
702
838
if(dirst == NULL){
703
839
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
706
842
goto fallback;
707
843
}
708
844
break;
738
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
875
size_t suf_len = strlen(*suf);
740
876
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
742
878
== 0)){
743
879
if(debug){
744
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
753
889
continue;
754
890
}
755
891
}
756
892
757
893
char *filename;
758
894
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
760
897
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
762
901
}
763
902
if(ret < 0){
764
perror("asprintf");
903
error(0, errno, "asprintf");
765
904
continue;
766
905
}
767
906
768
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
769
908
if(ret == -1){
770
perror("stat");
909
error(0, errno, "stat");
771
910
free(filename);
772
911
continue;
773
912
}
774
913
775
914
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
777
917
if(debug){
778
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
919
" with bad type or mode\n", filename);
784
924
785
925
plugin *p = getplugin(dirst->d_name);
786
926
if(p == NULL){
787
perror("getplugin");
927
error(0, errno, "getplugin");
788
928
free(filename);
789
929
continue;
790
930
}
802
942
if(g != NULL){
803
943
for(char **a = g->argv + 1; *a != NULL; a++){
804
944
if(not add_argument(p, *a)){
805
perror("add_argument");
945
error(0, errno, "add_argument");
806
946
}
807
947
}
808
948
/* Add global environment variables */
809
949
for(char **e = g->environ; *e != NULL; e++){
810
950
if(not add_environment(p, *e, false)){
811
perror("add_environment");
951
error(0, errno, "add_environment");
812
952
}
813
953
}
814
954
}
819
959
if(p->environ[0] != NULL){
820
960
for(char **e = environ; *e != NULL; e++){
821
961
if(not add_environment(p, *e, false)){
822
perror("add_environment");
962
error(0, errno, "add_environment");
823
963
}
824
964
}
825
965
}
826
966
827
967
int pipefd[2];
828
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
829
969
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
832
972
goto fallback;
833
973
}
834
974
/* Ask OS to automatic close the pipe on exec */
835
975
ret = set_cloexec_flag(pipefd[0]);
836
976
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
839
979
goto fallback;
840
980
}
841
981
ret = set_cloexec_flag(pipefd[1]);
842
982
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
845
985
goto fallback;
846
986
}
847
987
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
849
991
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
852
994
goto fallback;
853
995
}
854
996
/* Starting a new process to be watched */
855
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
856
1001
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
859
1004
goto fallback;
860
1005
}
861
1006
if(pid == 0){
862
1007
/* this is the child process */
863
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1009
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
867
1012
}
868
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1014
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
872
1017
}
873
1018
874
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1020
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
878
1023
}
879
1024
880
1025
if(dirfd(dir) < 0){
884
1029
}
885
1030
if(p->environ[0] == NULL){
886
1031
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
889
1034
}
890
1035
} else {
891
1036
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
894
1039
}
895
1040
}
896
1041
/* no return */
897
1042
}
898
1043
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
900
1046
free(filename);
901
1047
plugin *new_plugin = getplugin(dirst->d_name);
902
1048
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
905
1053
if(ret < 0){
906
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
907
1055
}
908
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
909
1057
goto fallback;
910
1058
}
911
1059
914
1062
915
1063
/* Unblock SIGCHLD so signal handler can be run if this process
916
1064
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
918
1068
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
921
1071
goto fallback;
922
1072
}
923
1073
924
FD_SET(new_plugin->fd, &rfds_all);
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
925
1088
926
1089
if(maxfd < new_plugin->fd){
927
1090
maxfd = new_plugin->fd;
928
1091
}
929
1092
}
930
1093
931
closedir(dir);
1094
TEMP_FAILURE_RETRY(closedir(dir));
932
1095
dir = NULL;
933
1096
free_plugin(getplugin(NULL));
934
1097
947
1110
while(plugin_list){
948
1111
fd_set rfds = rfds_all;
949
1112
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1113
if(select_ret == -1 and errno != EINTR){
1114
error(0, errno, "select");
1115
exitstatus = EX_OSERR;
953
1116
goto fallback;
954
1117
}
955
1118
/* OK, now either a process completed, or something can be read
961
1124
if(not WIFEXITED(proc->status)
962
1125
or WEXITSTATUS(proc->status) != 0){
963
1126
/* Bad exit by plugin */
964
1127
965
1128
if(debug){
966
1129
if(WIFEXITED(proc->status)){
967
1130
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1133
WEXITSTATUS(proc->status));
971
1134
} else if(WIFSIGNALED(proc->status)){
972
1135
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1136
" signal %d: %s\n", proc->name,
974
1137
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1138
WTERMSIG(proc->status),
1139
strsignal(WTERMSIG(proc->status)));
976
1140
} else if(WCOREDUMP(proc->status)){
977
1141
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
1142
" core\n", proc->name, (intmax_t) (proc->pid));
980
1144
}
981
1145
982
1146
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1147
#if defined (__GNUC__) and defined (__GLIBC__)
1148
#if not __GLIBC_PREREQ(2, 16)
1149
#pragma GCC diagnostic push
1150
#pragma GCC diagnostic ignored "-Wsign-conversion"
1151
#endif
1152
#endif
1153
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1154
-Wconversion in GNU libc
1155
before 2.16 */
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic pop
1159
#endif
1160
#endif
1161
985
1162
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1163
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1164
(SIG_BLOCK,
1165
&sigchld_action.sa_mask,
1166
NULL));
987
1167
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1168
error(0, errno, "sigprocmask");
1169
exitstatus = EX_OSERR;
990
1170
goto fallback;
991
1171
}
992
1172
995
1175
proc = next_plugin;
996
1176
997
1177
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1178
ret = (int)(TEMP_FAILURE_RETRY
1179
(sigprocmask(SIG_UNBLOCK,
1180
&sigchld_action.sa_mask, NULL)));
1000
1181
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
1003
1184
goto fallback;
1004
1185
}
1005
1186
1015
1196
bool bret = print_out_password(proc->buffer,
1016
1197
proc->buffer_length);
1017
1198
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1199
error(0, errno, "print_out_password");
1200
exitstatus = EX_IOERR;
1020
1201
}
1021
1202
goto fallback;
1022
1203
}
1023
1204
1024
1205
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1206
#if defined (__GNUC__) and defined (__GLIBC__)
1207
#if not __GLIBC_PREREQ(2, 16)
1208
#pragma GCC diagnostic push
1209
#pragma GCC diagnostic ignored "-Wsign-conversion"
1210
#endif
1211
#endif
1212
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1213
warning from
1214
-Wconversion
1215
in GNU libc
1216
before
1217
2.16 */
1218
#if defined (__GNUC__) and defined (__GLIBC__)
1219
#if not __GLIBC_PREREQ(2, 16)
1220
#pragma GCC diagnostic pop
1221
#endif
1222
#endif
1026
1223
/* This process had nothing to say at this time */
1027
1224
proc = proc->next;
1028
1225
continue;
1032
1229
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
1230
+ (size_t) BUFFER_SIZE);
1034
1231
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "malloc");
1233
exitstatus = EX_OSERR;
1037
1234
goto fallback;
1038
1235
}
1039
1236
proc->buffer_size += BUFFER_SIZE;
1040
1237
}
1041
1238
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1044
1243
if(sret < 0){
1045
1244
/* Read error from this process; ignore the error */
1046
1245
proc = proc->next;
1054
1253
}
1055
1254
}
1056
1255
}
1057
1058
1256
1257
1059
1258
fallback:
1060
1259
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1062
1262
/* Fallback if all plugins failed, none are found or an error
1063
1263
occured */
1064
1264
bool bret;
1072
1272
}
1073
1273
bret = print_out_password(passwordbuffer, len);
1074
1274
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1077
1277
}
1078
1278
}
1079
1279
1080
1280
/* Restore old signal handler */
1081
1281
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1282
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1085
1285
}
1086
1286
1087
1287
if(custom_argv != NULL){
1102
1302
ret = kill(p->pid, SIGTERM);
1103
1303
if(ret == -1 and errno != ESRCH){
1104
1304
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1305
error(0, errno, "kill");
1106
1306
}
1107
1307
}
1108
1308
}
1109
1309
1110
1310
/* Wait for any remaining child processes to terminate */
1111
do{
1311
do {
1112
1312
ret = wait(NULL);
1113
1313
} while(ret >= 0);
1114
1314
if(errno != ECHILD){
1115
perror("wait");
1315
error(0, errno, "wait");
1116
1316
}
1117
1317
1118
1318
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0