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- Committer: Teddy Hogeborn
- Date: 2013-10-22 19:46:35 UTC
- Revision ID: teddy@recompile.se-20131022194635-ll6jyg1snrxwe94o
* TODO
- 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,
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
72
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
80
74
81
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
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;
149
171
}
150
172
151
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
152
175
static bool add_to_char_array(const char *new, char ***array,
153
176
int *len){
154
177
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
157
182
/* Malloc check */
158
183
if(*array == NULL){
159
184
return false;
160
185
}
161
186
/* Make a copy of the new string */
162
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
163
191
if(copy == NULL){
164
192
return false;
165
193
}
172
200
}
173
201
174
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
175
204
static bool add_argument(plugin *p, const char *arg){
176
205
if(p == NULL){
177
206
return false;
180
209
}
181
210
182
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
183
213
static bool add_environment(plugin *p, const char *def, bool replace){
184
214
if(p == NULL){
185
215
return false;
191
221
if(strncmp(*e, def, namelen + 1) == 0){
192
222
/* It already exists */
193
223
if(replace){
194
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);
195
228
if(new == NULL){
196
229
return false;
197
230
}
207
240
/*
208
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
242
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
244
*/
212
245
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
247
/* If reading the flags failed, return error indication now. */
215
248
if(ret < 0){
216
249
return ret;
217
250
}
218
251
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
220
254
}
221
255
222
256
237
271
/* No child processes */
238
272
break;
239
273
}
240
perror("waitpid");
274
error(0, errno, "waitpid");
241
275
}
242
276
243
277
/* A child exited, find it in process_list */
255
289
}
256
290
257
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
258
293
static bool print_out_password(const char *buffer, size_t length){
259
294
ssize_t ret;
260
295
for(size_t written = 0; written < length; written += (size_t)ret){
268
303
}
269
304
270
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
271
307
static void free_plugin(plugin *plugin_node){
272
308
273
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
279
315
}
280
316
free(plugin_node->environ);
281
317
free(plugin_node->buffer);
282
318
283
319
/* Removes the plugin from the singly-linked list */
284
320
if(plugin_node == plugin_list){
285
321
/* First one - simple */
312
348
struct dirent *dirst;
313
349
struct stat st;
314
350
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
351
int ret, maxfd = 0;
316
352
ssize_t sret;
317
intmax_t tmpmax;
318
353
uid_t uid = 65534;
319
354
gid_t gid = 65534;
320
355
bool debug = false;
329
364
sigemptyset(&sigchld_action.sa_mask);
330
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
331
366
if(ret == -1){
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
334
369
goto fallback;
335
370
}
336
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
372
if(ret == -1){
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
340
375
goto fallback;
341
376
}
342
377
374
409
.doc = "Group ID the plugins will run as", .group = 3 },
375
410
{ .name = "debug", .key = 132,
376
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 },
377
421
{ .name = NULL }
378
422
};
379
423
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
382
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
383
430
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;
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
393
436
}
394
437
}
395
438
}
396
439
break;
397
440
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
}
441
add_environment(getplugin(NULL), arg, true);
404
442
break;
405
443
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;
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;
423
462
}
424
463
}
425
464
}
426
465
break;
427
466
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
467
{
432
468
char *envdef = strchr(arg, ':');
433
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
434
472
break;
435
473
}
436
474
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
439
480
}
481
add_environment(getplugin(arg), envdef, true);
440
482
}
441
483
break;
442
484
case 'd': /* --disable */
443
if(arg != NULL){
485
{
444
486
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
447
489
}
448
p->disabled = true;
449
490
}
450
491
break;
451
492
case 'e': /* --enable */
452
if(arg != NULL){
493
{
453
494
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
456
497
}
457
p->disabled = false;
458
498
}
459
499
break;
460
500
case 128: /* --plugin-dir */
461
501
free(plugindir);
462
502
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
503
break;
467
504
case 129: /* --config-file */
468
505
/* This is already done by parse_opt_config_file() */
469
506
break;
470
507
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;
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;
478
514
}
515
uid = (uid_t)tmp_id;
479
516
break;
480
517
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;
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;
488
524
}
525
gid = (gid_t)tmp_id;
489
526
break;
490
527
case 132: /* --debug */
491
528
debug = true;
492
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;
493
544
/*
494
545
* When adding more options before this line, remember to also add a
495
546
* "case" to the "parse_opt_config_file" function below.
498
549
/* Cryptsetup always passes an argument, which is an empty
499
550
string if "none" was specified in /etc/crypttab. So if
500
551
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
503
554
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
555
default:
508
556
return ARGP_ERR_UNKNOWN;
509
557
}
510
return 0;
558
return errno; /* Set to 0 at start */
511
559
}
512
560
513
561
/* This option parser is the same as parse_opt() above, except it
515
563
error_t parse_opt_config_file(int key, char *arg,
516
564
__attribute__((unused))
517
565
struct argp_state *state){
566
errno = 0;
518
567
switch(key){
519
568
case 'g': /* --global-options */
520
569
case 'G': /* --global-env */
527
576
case 129: /* --config-file */
528
577
free(argfile);
529
578
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
579
break;
534
580
case 130: /* --userid */
535
581
case 131: /* --groupid */
536
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
537
586
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
587
break;
540
588
default:
541
589
return ARGP_ERR_UNKNOWN;
542
590
}
543
return 0;
591
return errno;
544
592
}
545
593
546
594
struct argp argp = { .options = options,
550
598
551
599
/* Parse using parse_opt_config_file() in order to get the custom
552
600
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;
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;
557
615
goto fallback;
558
616
}
559
617
565
623
conffp = fopen(AFILE, "r");
566
624
} else {
567
625
conffp = fopen(argfile, "r");
568
}
626
}
569
627
if(conffp != NULL){
570
628
char *org_line = NULL;
571
629
char *p, *arg, *new_arg, *line;
572
630
size_t size = 0;
573
631
const char whitespace_delims[] = " \r\t\f\v\n";
574
632
const char comment_delim[] = "#";
575
633
576
634
custom_argc = 1;
577
635
custom_argv = malloc(sizeof(char*) * 2);
578
636
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
581
639
goto fallback;
582
640
}
583
641
custom_argv[0] = argv[0];
584
642
custom_argv[1] = NULL;
585
643
586
644
/* for each line in the config file, strip whitespace and ignore
587
645
commented text */
588
646
while(true){
590
648
if(sret == -1){
591
649
break;
592
650
}
593
651
594
652
line = org_line;
595
653
arg = strsep(&line, comment_delim);
596
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
599
657
}
600
658
new_arg = strdup(p);
601
659
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
604
662
free(org_line);
605
663
goto fallback;
606
664
}
609
667
custom_argv = realloc(custom_argv, sizeof(char *)
610
668
* ((unsigned int) custom_argc + 1));
611
669
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
614
672
free(org_line);
615
673
goto fallback;
616
674
}
617
675
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
619
677
}
620
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
}
621
687
free(org_line);
622
688
} else {
623
689
/* Check for harmful errors and go to fallback. Other errors might
624
690
not affect opening plugins */
625
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
628
694
goto fallback;
629
695
}
630
696
}
631
/* If there was any arguments from configuration file,
632
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 */
633
699
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;
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;
639
714
goto fallback;
640
715
}
641
716
}
642
717
643
718
/* Parse actual command line arguments, to let them override the
644
719
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;
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;
649
734
goto fallback;
650
735
}
651
736
663
748
}
664
749
}
665
750
666
/* Strip permissions down to nobody */
667
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);
668
775
if(ret == -1){
669
perror("setgid");
776
error(0, errno, "setgid");
670
777
}
671
778
ret = setuid(uid);
672
779
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 */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
689
784
{
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
}
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;
698
826
}
699
827
}
700
828
702
830
703
831
/* Read and execute any executable in the plugin directory*/
704
832
while(true){
705
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
706
836
707
837
/* All directory entries have been processed */
708
838
if(dirst == NULL){
709
839
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
712
842
goto fallback;
713
843
}
714
844
break;
744
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
875
size_t suf_len = strlen(*suf);
746
876
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
748
878
== 0)){
749
879
if(debug){
750
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
889
continue;
760
890
}
761
891
}
762
892
763
893
char *filename;
764
894
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
766
897
} else {
767
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));
768
901
}
769
902
if(ret < 0){
770
perror("asprintf");
903
error(0, errno, "asprintf");
771
904
continue;
772
905
}
773
906
774
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
775
908
if(ret == -1){
776
perror("stat");
909
error(0, errno, "stat");
777
910
free(filename);
778
911
continue;
779
912
}
780
913
781
914
/* Ignore non-executable files */
782
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)){
783
917
if(debug){
784
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
919
" with bad type or mode\n", filename);
790
924
791
925
plugin *p = getplugin(dirst->d_name);
792
926
if(p == NULL){
793
perror("getplugin");
927
error(0, errno, "getplugin");
794
928
free(filename);
795
929
continue;
796
930
}
808
942
if(g != NULL){
809
943
for(char **a = g->argv + 1; *a != NULL; a++){
810
944
if(not add_argument(p, *a)){
811
perror("add_argument");
945
error(0, errno, "add_argument");
812
946
}
813
947
}
814
948
/* Add global environment variables */
815
949
for(char **e = g->environ; *e != NULL; e++){
816
950
if(not add_environment(p, *e, false)){
817
perror("add_environment");
951
error(0, errno, "add_environment");
818
952
}
819
953
}
820
954
}
825
959
if(p->environ[0] != NULL){
826
960
for(char **e = environ; *e != NULL; e++){
827
961
if(not add_environment(p, *e, false)){
828
perror("add_environment");
962
error(0, errno, "add_environment");
829
963
}
830
964
}
831
965
}
832
966
833
967
int pipefd[2];
834
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
835
969
if(ret == -1){
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
838
972
goto fallback;
839
973
}
840
974
/* Ask OS to automatic close the pipe on exec */
841
975
ret = set_cloexec_flag(pipefd[0]);
842
976
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
845
979
goto fallback;
846
980
}
847
981
ret = set_cloexec_flag(pipefd[1]);
848
982
if(ret < 0){
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
851
985
goto fallback;
852
986
}
853
987
/* Block SIGCHLD until process is safely in process list */
854
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));
855
991
if(ret < 0){
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
858
994
goto fallback;
859
995
}
860
996
/* Starting a new process to be watched */
861
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
862
1001
if(pid == -1){
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
865
1004
goto fallback;
866
1005
}
867
1006
if(pid == 0){
868
1007
/* this is the child process */
869
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
870
1009
if(ret < 0){
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
873
1012
}
874
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
1014
if(ret < 0){
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
878
1017
}
879
1018
880
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
1020
if(ret == -1){
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
884
1023
}
885
1024
886
1025
if(dirfd(dir) < 0){
890
1029
}
891
1030
if(p->environ[0] == NULL){
892
1031
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
895
1034
}
896
1035
} else {
897
1036
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
900
1039
}
901
1040
}
902
1041
/* no return */
903
1042
}
904
1043
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
906
1046
free(filename);
907
1047
plugin *new_plugin = getplugin(dirst->d_name);
908
1048
if(new_plugin == NULL){
909
perror("getplugin");
910
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)));
911
1053
if(ret < 0){
912
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
913
1055
}
914
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
915
1057
goto fallback;
916
1058
}
917
1059
920
1062
921
1063
/* Unblock SIGCHLD so signal handler can be run if this process
922
1064
has already completed */
923
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));
924
1068
if(ret < 0){
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
927
1071
goto fallback;
928
1072
}
929
1073
930
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
931
1076
932
1077
if(maxfd < new_plugin->fd){
933
1078
maxfd = new_plugin->fd;
934
1079
}
935
1080
}
936
1081
937
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
938
1083
dir = NULL;
1084
free_plugin(getplugin(NULL));
939
1085
940
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
1087
if(p->pid != 0){
952
1098
while(plugin_list){
953
1099
fd_set rfds = rfds_all;
954
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
958
1104
goto fallback;
959
1105
}
960
1106
/* OK, now either a process completed, or something can be read
966
1112
if(not WIFEXITED(proc->status)
967
1113
or WEXITSTATUS(proc->status) != 0){
968
1114
/* Bad exit by plugin */
969
1115
970
1116
if(debug){
971
1117
if(WIFEXITED(proc->status)){
972
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
975
1121
WEXITSTATUS(proc->status));
976
1122
} else if(WIFSIGNALED(proc->status)){
977
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
1124
" signal %d: %s\n", proc->name,
979
1125
(intmax_t) (proc->pid),
980
WTERMSIG(proc->status));
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
981
1128
} else if(WCOREDUMP(proc->status)){
982
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
1130
" core\n", proc->name, (intmax_t) (proc->pid));
985
1132
}
986
1133
987
1134
/* Remove the plugin */
988
FD_CLR(proc->fd, &rfds_all);
989
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
990
1138
/* Block signal while modifying process_list */
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
992
1143
if(ret < 0){
993
perror("sigprocmask");
994
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
995
1146
goto fallback;
996
1147
}
997
1148
1000
1151
proc = next_plugin;
1001
1152
1002
1153
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
1005
1157
if(ret < 0){
1006
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1008
1160
goto fallback;
1009
1161
}
1010
1162
1020
1172
bool bret = print_out_password(proc->buffer,
1021
1173
proc->buffer_length);
1022
1174
if(not bret){
1023
perror("print_out_password");
1024
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1025
1177
}
1026
1178
goto fallback;
1027
1179
}
1028
1180
1029
1181
/* This process has not completed. Does it have any output? */
1030
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1031
1185
/* This process had nothing to say at this time */
1032
1186
proc = proc->next;
1033
1187
continue;
1037
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
1192
+ (size_t) BUFFER_SIZE);
1039
1193
if(proc->buffer == NULL){
1040
perror("malloc");
1041
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1042
1196
goto fallback;
1043
1197
}
1044
1198
proc->buffer_size += BUFFER_SIZE;
1045
1199
}
1046
1200
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1049
1205
if(sret < 0){
1050
1206
/* Read error from this process; ignore the error */
1051
1207
proc = proc->next;
1059
1215
}
1060
1216
}
1061
1217
}
1062
1063
1218
1219
1064
1220
fallback:
1065
1221
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1067
1224
/* Fallback if all plugins failed, none are found or an error
1068
1225
occured */
1069
1226
bool bret;
1077
1234
}
1078
1235
bret = print_out_password(passwordbuffer, len);
1079
1236
if(not bret){
1080
perror("print_out_password");
1081
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1082
1239
}
1083
1240
}
1084
1241
1085
1242
/* Restore old signal handler */
1086
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1087
1244
if(ret == -1){
1088
perror("sigaction");
1089
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1090
1247
}
1091
1248
1092
1249
if(custom_argv != NULL){
1107
1264
ret = kill(p->pid, SIGTERM);
1108
1265
if(ret == -1 and errno != ESRCH){
1109
1266
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1267
error(0, errno, "kill");
1111
1268
}
1112
1269
}
1113
1270
}
1114
1271
1115
1272
/* Wait for any remaining child processes to terminate */
1116
do{
1273
do {
1117
1274
ret = wait(NULL);
1118
1275
} while(ret >= 0);
1119
1276
if(errno != ECHILD){
1120
perror("wait");
1277
error(0, errno, "wait");
1121
1278
}
1122
1279
1123
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0