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- Committer: Teddy Hogeborn
- Date: 2012-05-17 01:55:58 UTC
- mto: (299.1.1 release) (237.7.139 trunk) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 300.
- Revision ID: teddy@recompile.se-20120517015558-5703p8nkquc2rhgd
* .bzrignore (statedir): Added.
- 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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){
431
{
385
432
char *plugin_option;
386
433
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
388
continue;
389
}
390
434
if(not add_argument(getplugin(NULL), plugin_option)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
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 *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
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;
416
462
}
417
463
}
418
464
}
419
465
break;
420
466
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
424
467
{
425
468
char *envdef = strchr(arg, ':');
426
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
427
472
break;
428
473
}
429
474
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
432
480
}
481
add_environment(getplugin(arg), envdef, true);
433
482
}
434
483
break;
435
484
case 'd': /* --disable */
436
if(arg != NULL){
485
{
437
486
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
440
489
}
441
p->disabled = true;
442
490
}
443
491
break;
444
492
case 'e': /* --enable */
445
if(arg != NULL){
493
{
446
494
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
449
497
}
450
p->disabled = false;
451
498
}
452
499
break;
453
500
case 128: /* --plugin-dir */
454
501
free(plugindir);
455
502
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
503
break;
460
504
case 129: /* --config-file */
461
505
/* This is already done by parse_opt_config_file() */
462
506
break;
463
507
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
508
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;
471
514
}
515
uid = (uid_t)tmp_id;
472
516
break;
473
517
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
518
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;
481
524
}
525
gid = (gid_t)tmp_id;
482
526
break;
483
527
case 132: /* --debug */
484
528
debug = true;
485
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;
486
544
/*
487
545
* When adding more options before this line, remember to also add a
488
546
* "case" to the "parse_opt_config_file" function below.
491
549
/* Cryptsetup always passes an argument, which is an empty
492
550
string if "none" was specified in /etc/crypttab. So if
493
551
argument was empty, we ignore it silently. */
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
496
554
}
497
break;
498
case ARGP_KEY_END:
499
break;
500
555
default:
501
556
return ARGP_ERR_UNKNOWN;
502
557
}
503
return 0;
558
return errno; /* Set to 0 at start */
504
559
}
505
560
506
561
/* This option parser is the same as parse_opt() above, except it
508
563
error_t parse_opt_config_file(int key, char *arg,
509
564
__attribute__((unused))
510
565
struct argp_state *state){
566
errno = 0;
511
567
switch(key){
512
568
case 'g': /* --global-options */
513
569
case 'G': /* --global-env */
520
576
case 129: /* --config-file */
521
577
free(argfile);
522
578
argfile = strdup(arg);
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
579
break;
527
580
case 130: /* --userid */
528
581
case 131: /* --groupid */
529
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
530
586
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
532
587
break;
533
588
default:
534
589
return ARGP_ERR_UNKNOWN;
535
590
}
536
return 0;
591
return errno;
537
592
}
538
593
539
594
struct argp argp = { .options = options,
543
598
544
599
/* Parse using parse_opt_config_file() in order to get the custom
545
600
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
548
fprintf(stderr, "Unknown error while parsing arguments\n");
549
exitstatus = EXIT_FAILURE;
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;
550
615
goto fallback;
551
616
}
552
617
558
623
conffp = fopen(AFILE, "r");
559
624
} else {
560
625
conffp = fopen(argfile, "r");
561
}
626
}
562
627
if(conffp != NULL){
563
628
char *org_line = NULL;
564
629
char *p, *arg, *new_arg, *line;
565
630
size_t size = 0;
566
631
const char whitespace_delims[] = " \r\t\f\v\n";
567
632
const char comment_delim[] = "#";
568
633
569
634
custom_argc = 1;
570
635
custom_argv = malloc(sizeof(char*) * 2);
571
636
if(custom_argv == NULL){
572
perror("malloc");
573
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
574
639
goto fallback;
575
640
}
576
641
custom_argv[0] = argv[0];
577
642
custom_argv[1] = NULL;
578
643
579
644
/* for each line in the config file, strip whitespace and ignore
580
645
commented text */
581
646
while(true){
583
648
if(sret == -1){
584
649
break;
585
650
}
586
651
587
652
line = org_line;
588
653
arg = strsep(&line, comment_delim);
589
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
592
657
}
593
658
new_arg = strdup(p);
594
659
if(new_arg == NULL){
595
perror("strdup");
596
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
597
662
free(org_line);
598
663
goto fallback;
599
664
}
602
667
custom_argv = realloc(custom_argv, sizeof(char *)
603
668
* ((unsigned int) custom_argc + 1));
604
669
if(custom_argv == NULL){
605
perror("realloc");
606
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
607
672
free(org_line);
608
673
goto fallback;
609
674
}
610
675
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
612
677
}
613
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
}
614
687
free(org_line);
615
688
} else {
616
689
/* Check for harmful errors and go to fallback. Other errors might
617
690
not affect opening plugins */
618
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
619
perror("fopen");
620
exitstatus = EXIT_FAILURE;
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
621
694
goto fallback;
622
695
}
623
696
}
624
/* If there was any arguments from configuration file,
625
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 */
626
699
if(custom_argv != NULL){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
630
fprintf(stderr, "Unknown error while parsing arguments\n");
631
exitstatus = EXIT_FAILURE;
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;
632
714
goto fallback;
633
715
}
634
716
}
635
717
636
718
/* Parse actual command line arguments, to let them override the
637
719
config file */
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
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;
642
734
goto fallback;
643
735
}
644
736
656
748
}
657
749
}
658
750
659
/* Strip permissions down to nobody */
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 */
660
774
setgid(gid);
661
775
if(ret == -1){
662
perror("setgid");
776
error(0, errno, "setgid");
663
777
}
664
778
ret = setuid(uid);
665
779
if(ret == -1){
666
perror("setuid");
667
}
668
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
673
}
674
675
if(dir == NULL){
676
perror("Could not open plugin dir");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
680
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
682
784
{
683
int dir_fd = dirfd(dir);
684
if(dir_fd >= 0){
685
ret = set_cloexec_flag(dir_fd);
686
if(ret < 0){
687
perror("set_cloexec_flag");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
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;
691
826
}
692
827
}
693
828
695
830
696
831
/* Read and execute any executable in the plugin directory*/
697
832
while(true){
698
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
699
836
700
837
/* All directory entries have been processed */
701
838
if(dirst == NULL){
702
839
if(errno == EBADF){
703
perror("readdir");
704
exitstatus = EXIT_FAILURE;
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
705
842
goto fallback;
706
843
}
707
844
break;
737
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
738
875
size_t suf_len = strlen(*suf);
739
876
if((d_name_len >= suf_len)
740
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
741
878
== 0)){
742
879
if(debug){
743
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
752
889
continue;
753
890
}
754
891
}
755
892
756
893
char *filename;
757
894
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
759
897
} else {
760
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));
761
901
}
762
902
if(ret < 0){
763
perror("asprintf");
903
error(0, errno, "asprintf");
764
904
continue;
765
905
}
766
906
767
ret = stat(filename, &st);
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
768
908
if(ret == -1){
769
perror("stat");
909
error(0, errno, "stat");
770
910
free(filename);
771
911
continue;
772
912
}
773
913
774
914
/* Ignore non-executable files */
775
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)){
776
917
if(debug){
777
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
919
" with bad type or mode\n", filename);
783
924
784
925
plugin *p = getplugin(dirst->d_name);
785
926
if(p == NULL){
786
perror("getplugin");
927
error(0, errno, "getplugin");
787
928
free(filename);
788
929
continue;
789
930
}
801
942
if(g != NULL){
802
943
for(char **a = g->argv + 1; *a != NULL; a++){
803
944
if(not add_argument(p, *a)){
804
perror("add_argument");
945
error(0, errno, "add_argument");
805
946
}
806
947
}
807
948
/* Add global environment variables */
808
949
for(char **e = g->environ; *e != NULL; e++){
809
950
if(not add_environment(p, *e, false)){
810
perror("add_environment");
951
error(0, errno, "add_environment");
811
952
}
812
953
}
813
954
}
818
959
if(p->environ[0] != NULL){
819
960
for(char **e = environ; *e != NULL; e++){
820
961
if(not add_environment(p, *e, false)){
821
perror("add_environment");
962
error(0, errno, "add_environment");
822
963
}
823
964
}
824
965
}
825
966
826
967
int pipefd[2];
827
ret = pipe(pipefd);
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
828
969
if(ret == -1){
829
perror("pipe");
830
exitstatus = EXIT_FAILURE;
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
831
972
goto fallback;
832
973
}
833
974
/* Ask OS to automatic close the pipe on exec */
834
975
ret = set_cloexec_flag(pipefd[0]);
835
976
if(ret < 0){
836
perror("set_cloexec_flag");
837
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
838
979
goto fallback;
839
980
}
840
981
ret = set_cloexec_flag(pipefd[1]);
841
982
if(ret < 0){
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
844
985
goto fallback;
845
986
}
846
987
/* Block SIGCHLD until process is safely in process list */
847
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));
848
991
if(ret < 0){
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
851
994
goto fallback;
852
995
}
853
996
/* Starting a new process to be watched */
854
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
855
1001
if(pid == -1){
856
perror("fork");
857
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
858
1004
goto fallback;
859
1005
}
860
1006
if(pid == 0){
861
1007
/* this is the child process */
862
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
863
1009
if(ret < 0){
864
perror("sigaction");
865
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
866
1012
}
867
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
868
1014
if(ret < 0){
869
perror("sigprocmask");
870
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
871
1017
}
872
1018
873
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
874
1020
if(ret == -1){
875
perror("dup2");
876
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
877
1023
}
878
1024
879
1025
if(dirfd(dir) < 0){
883
1029
}
884
1030
if(p->environ[0] == NULL){
885
1031
if(execv(filename, p->argv) < 0){
886
perror("execv");
887
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
888
1034
}
889
1035
} else {
890
1036
if(execve(filename, p->argv, p->environ) < 0){
891
perror("execve");
892
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
893
1039
}
894
1040
}
895
1041
/* no return */
896
1042
}
897
1043
/* Parent process */
898
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
899
1046
free(filename);
900
1047
plugin *new_plugin = getplugin(dirst->d_name);
901
1048
if(new_plugin == NULL){
902
perror("getplugin");
903
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)));
904
1053
if(ret < 0){
905
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
906
1055
}
907
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
908
1057
goto fallback;
909
1058
}
910
1059
913
1062
914
1063
/* Unblock SIGCHLD so signal handler can be run if this process
915
1064
has already completed */
916
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));
917
1068
if(ret < 0){
918
perror("sigprocmask");
919
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
920
1071
goto fallback;
921
1072
}
922
1073
923
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
924
1076
925
1077
if(maxfd < new_plugin->fd){
926
1078
maxfd = new_plugin->fd;
927
1079
}
928
1080
}
929
1081
930
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
931
1083
dir = NULL;
932
1084
free_plugin(getplugin(NULL));
933
1085
946
1098
while(plugin_list){
947
1099
fd_set rfds = rfds_all;
948
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
949
if(select_ret == -1){
950
perror("select");
951
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
952
1104
goto fallback;
953
1105
}
954
1106
/* OK, now either a process completed, or something can be read
960
1112
if(not WIFEXITED(proc->status)
961
1113
or WEXITSTATUS(proc->status) != 0){
962
1114
/* Bad exit by plugin */
963
1115
964
1116
if(debug){
965
1117
if(WIFEXITED(proc->status)){
966
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
969
1121
WEXITSTATUS(proc->status));
970
1122
} else if(WIFSIGNALED(proc->status)){
971
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
1124
" signal %d: %s\n", proc->name,
973
1125
(intmax_t) (proc->pid),
974
WTERMSIG(proc->status));
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
975
1128
} else if(WCOREDUMP(proc->status)){
976
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
1130
" core\n", proc->name, (intmax_t) (proc->pid));
979
1132
}
980
1133
981
1134
/* Remove the plugin */
982
FD_CLR(proc->fd, &rfds_all);
983
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
984
1138
/* Block signal while modifying process_list */
985
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));
986
1143
if(ret < 0){
987
perror("sigprocmask");
988
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
989
1146
goto fallback;
990
1147
}
991
1148
994
1151
proc = next_plugin;
995
1152
996
1153
/* We are done modifying process list, so unblock signal */
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
999
1157
if(ret < 0){
1000
perror("sigprocmask");
1001
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1002
1160
goto fallback;
1003
1161
}
1004
1162
1014
1172
bool bret = print_out_password(proc->buffer,
1015
1173
proc->buffer_length);
1016
1174
if(not bret){
1017
perror("print_out_password");
1018
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1019
1177
}
1020
1178
goto fallback;
1021
1179
}
1022
1180
1023
1181
/* This process has not completed. Does it have any output? */
1024
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 */
1025
1185
/* This process had nothing to say at this time */
1026
1186
proc = proc->next;
1027
1187
continue;
1031
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1032
1192
+ (size_t) BUFFER_SIZE);
1033
1193
if(proc->buffer == NULL){
1034
perror("malloc");
1035
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1036
1196
goto fallback;
1037
1197
}
1038
1198
proc->buffer_size += BUFFER_SIZE;
1039
1199
}
1040
1200
/* Read from the process */
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1043
1205
if(sret < 0){
1044
1206
/* Read error from this process; ignore the error */
1045
1207
proc = proc->next;
1053
1215
}
1054
1216
}
1055
1217
}
1056
1057
1218
1219
1058
1220
fallback:
1059
1221
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1061
1224
/* Fallback if all plugins failed, none are found or an error
1062
1225
occured */
1063
1226
bool bret;
1071
1234
}
1072
1235
bret = print_out_password(passwordbuffer, len);
1073
1236
if(not bret){
1074
perror("print_out_password");
1075
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1076
1239
}
1077
1240
}
1078
1241
1079
1242
/* Restore old signal handler */
1080
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1081
1244
if(ret == -1){
1082
perror("sigaction");
1083
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1084
1247
}
1085
1248
1086
1249
if(custom_argv != NULL){
1101
1264
ret = kill(p->pid, SIGTERM);
1102
1265
if(ret == -1 and errno != ESRCH){
1103
1266
/* Set-uid proccesses might not get closed */
1104
perror("kill");
1267
error(0, errno, "kill");
1105
1268
}
1106
1269
}
1107
1270
}
1108
1271
1109
1272
/* Wait for any remaining child processes to terminate */
1110
do{
1273
do {
1111
1274
ret = wait(NULL);
1112
1275
} while(ret >= 0);
1113
1276
if(errno != ECHILD){
1114
perror("wait");
1277
error(0, errno, "wait");
1115
1278
}
1116
1279
1117
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0