To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 505.3.10
- compare with another revision
- download diff
- download tarball
- view history from revision 505.3.10
- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (505.2.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111124201524-5w9ovzpuw3drdlgf
* network-hooks.d: New directory.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
* network-hooks.d/bridge: New example hook.
* network-hooks.d/bridge.conf: Config file for bridge example hook.
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
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;
131
free(new_plugin);
132
errno = e;
118
133
return NULL;
119
134
}
120
135
}
121
136
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
126
141
127
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);
128
145
if(new_plugin->argv == NULL){
146
int e = errno;
129
147
free(copy_name);
130
148
free(new_plugin);
149
errno = e;
131
150
return NULL;
132
151
}
133
152
new_plugin->argv[0] = copy_name;
134
153
new_plugin->argv[1] = NULL;
135
154
136
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
137
158
if(new_plugin->environ == NULL){
159
int e = errno;
138
160
free(copy_name);
139
161
free(new_plugin->argv);
140
162
free(new_plugin);
163
errno = e;
141
164
return NULL;
142
165
}
143
166
new_plugin->environ[0] = NULL;
151
174
static bool add_to_char_array(const char *new, char ***array,
152
175
int *len){
153
176
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
156
181
/* Malloc check */
157
182
if(*array == NULL){
158
183
return false;
159
184
}
160
185
/* Make a copy of the new string */
161
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
162
190
if(copy == NULL){
163
191
return false;
164
192
}
190
218
if(strncmp(*e, def, namelen + 1) == 0){
191
219
/* It already exists */
192
220
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
194
225
if(new == NULL){
195
226
return false;
196
227
}
206
237
/*
207
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
239
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
241
*/
211
242
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
244
/* If reading the flags failed, return error indication now. */
214
245
if(ret < 0){
215
246
return ret;
216
247
}
217
248
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
219
251
}
220
252
221
253
222
254
/* Mark processes as completed when they exit, and save their exit
223
255
status. */
224
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
225
258
while(true){
226
259
plugin *proc = plugin_list;
227
260
int status;
231
264
break;
232
265
}
233
266
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
236
270
}
237
/* No child processes */
238
break;
271
error(0, errno, "waitpid");
239
272
}
240
273
241
274
/* A child exited, find it in process_list */
247
280
continue;
248
281
}
249
282
proc->status = status;
250
proc->completed = true;
283
proc->completed = 1;
251
284
}
285
errno = old_errno;
252
286
}
253
287
254
288
/* Prints out a password to stdout */
276
310
}
277
311
free(plugin_node->environ);
278
312
free(plugin_node->buffer);
279
313
280
314
/* Removes the plugin from the singly-linked list */
281
315
if(plugin_node == plugin_list){
282
316
/* First one - simple */
309
343
struct dirent *dirst;
310
344
struct stat st;
311
345
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
346
int ret, maxfd = 0;
313
347
ssize_t sret;
314
intmax_t tmpmax;
315
348
uid_t uid = 65534;
316
349
gid_t gid = 65534;
317
350
bool debug = false;
326
359
sigemptyset(&sigchld_action.sa_mask);
327
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
361
if(ret == -1){
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
331
364
goto fallback;
332
365
}
333
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
367
if(ret == -1){
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
337
370
goto fallback;
338
371
}
339
372
371
404
.doc = "Group ID the plugins will run as", .group = 3 },
372
405
{ .name = "debug", .key = 132,
373
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
374
416
{ .name = NULL }
375
417
};
376
418
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
380
424
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
390
430
}
391
431
}
392
432
}
393
433
break;
394
434
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
435
add_environment(getplugin(NULL), arg, true);
401
436
break;
402
437
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
420
456
}
421
457
}
422
458
}
423
459
break;
424
460
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
461
{
429
462
char *envdef = strchr(arg, ':');
430
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
431
466
break;
432
467
}
433
468
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
436
474
}
475
add_environment(getplugin(arg), envdef, true);
437
476
}
438
477
break;
439
478
case 'd': /* --disable */
440
if(arg != NULL){
479
{
441
480
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
444
483
}
445
p->disabled = true;
446
484
}
447
485
break;
448
486
case 'e': /* --enable */
449
if(arg != NULL){
487
{
450
488
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
453
491
}
454
p->disabled = false;
455
492
}
456
493
break;
457
494
case 128: /* --plugin-dir */
458
495
free(plugindir);
459
496
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
497
break;
464
498
case 129: /* --config-file */
465
499
/* This is already done by parse_opt_config_file() */
466
500
break;
467
501
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
475
508
}
509
uid = (uid_t)tmpmax;
476
510
break;
477
511
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
485
518
}
519
gid = (gid_t)tmpmax;
486
520
break;
487
521
case 132: /* --debug */
488
522
debug = true;
489
523
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
490
538
/*
491
539
* When adding more options before this line, remember to also add a
492
540
* "case" to the "parse_opt_config_file" function below.
495
543
/* Cryptsetup always passes an argument, which is an empty
496
544
string if "none" was specified in /etc/crypttab. So if
497
545
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
500
548
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
549
default:
505
550
return ARGP_ERR_UNKNOWN;
506
551
}
507
return 0;
552
return errno; /* Set to 0 at start */
508
553
}
509
554
510
555
/* This option parser is the same as parse_opt() above, except it
511
556
ignores everything but the --config-file option. */
512
557
error_t parse_opt_config_file(int key, char *arg,
513
558
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
516
562
case 'g': /* --global-options */
517
563
case 'G': /* --global-env */
518
564
case 'o': /* --options-for */
524
570
case 129: /* --config-file */
525
571
free(argfile);
526
572
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
573
break;
531
574
case 130: /* --userid */
532
575
case 131: /* --groupid */
533
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
534
580
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
581
break;
537
582
default:
538
583
return ARGP_ERR_UNKNOWN;
539
584
}
540
return 0;
585
return errno;
541
586
}
542
587
543
588
struct argp argp = { .options = options,
547
592
548
593
/* Parse using parse_opt_config_file() in order to get the custom
549
594
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
554
609
goto fallback;
555
610
}
556
611
562
617
conffp = fopen(AFILE, "r");
563
618
} else {
564
619
conffp = fopen(argfile, "r");
565
}
620
}
566
621
if(conffp != NULL){
567
622
char *org_line = NULL;
568
623
char *p, *arg, *new_arg, *line;
569
624
size_t size = 0;
570
625
const char whitespace_delims[] = " \r\t\f\v\n";
571
626
const char comment_delim[] = "#";
572
627
573
628
custom_argc = 1;
574
629
custom_argv = malloc(sizeof(char*) * 2);
575
630
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
578
633
goto fallback;
579
634
}
580
635
custom_argv[0] = argv[0];
581
636
custom_argv[1] = NULL;
582
637
583
638
/* for each line in the config file, strip whitespace and ignore
584
639
commented text */
585
640
while(true){
587
642
if(sret == -1){
588
643
break;
589
644
}
590
645
591
646
line = org_line;
592
647
arg = strsep(&line, comment_delim);
593
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
651
}
597
652
new_arg = strdup(p);
598
653
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
601
656
free(org_line);
602
657
goto fallback;
603
658
}
606
661
custom_argv = realloc(custom_argv, sizeof(char *)
607
662
* ((unsigned int) custom_argc + 1));
608
663
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
611
666
free(org_line);
612
667
goto fallback;
613
668
}
614
669
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
616
671
}
617
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
618
681
free(org_line);
619
682
} else {
620
683
/* Check for harmful errors and go to fallback. Other errors might
621
684
not affect opening plugins */
622
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
625
688
goto fallback;
626
689
}
627
690
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
630
693
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
636
708
goto fallback;
637
709
}
638
710
}
639
711
640
712
/* Parse actual command line arguments, to let them override the
641
713
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
646
728
goto fallback;
647
729
}
648
730
660
742
}
661
743
}
662
744
663
/* Strip permissions down to nobody */
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
768
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
664
772
ret = setuid(uid);
665
773
if(ret == -1){
666
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
686
778
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
695
820
}
696
821
}
697
822
699
824
700
825
/* Read and execute any executable in the plugin directory*/
701
826
while(true){
702
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
703
830
704
831
/* All directory entries have been processed */
705
832
if(dirst == NULL){
706
833
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
709
836
goto fallback;
710
837
}
711
838
break;
741
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
869
size_t suf_len = strlen(*suf);
743
870
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
745
872
== 0)){
746
873
if(debug){
747
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
756
883
continue;
757
884
}
758
885
}
759
886
760
887
char *filename;
761
888
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
763
891
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
765
895
}
766
896
if(ret < 0){
767
perror("asprintf");
897
error(0, errno, "asprintf");
768
898
continue;
769
899
}
770
900
771
ret = stat(filename, &st);
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
902
if(ret == -1){
773
perror("stat");
903
error(0, errno, "stat");
774
904
free(filename);
775
905
continue;
776
906
}
777
907
778
908
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
780
911
if(debug){
781
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
913
" with bad type or mode\n", filename);
787
918
788
919
plugin *p = getplugin(dirst->d_name);
789
920
if(p == NULL){
790
perror("getplugin");
921
error(0, errno, "getplugin");
791
922
free(filename);
792
923
continue;
793
924
}
805
936
if(g != NULL){
806
937
for(char **a = g->argv + 1; *a != NULL; a++){
807
938
if(not add_argument(p, *a)){
808
perror("add_argument");
939
error(0, errno, "add_argument");
809
940
}
810
941
}
811
942
/* Add global environment variables */
812
943
for(char **e = g->environ; *e != NULL; e++){
813
944
if(not add_environment(p, *e, false)){
814
perror("add_environment");
945
error(0, errno, "add_environment");
815
946
}
816
947
}
817
948
}
822
953
if(p->environ[0] != NULL){
823
954
for(char **e = environ; *e != NULL; e++){
824
955
if(not add_environment(p, *e, false)){
825
perror("add_environment");
956
error(0, errno, "add_environment");
826
957
}
827
958
}
828
959
}
829
960
830
961
int pipefd[2];
831
ret = pipe(pipefd);
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
963
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
835
966
goto fallback;
836
967
}
837
968
/* Ask OS to automatic close the pipe on exec */
838
969
ret = set_cloexec_flag(pipefd[0]);
839
970
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
842
973
goto fallback;
843
974
}
844
975
ret = set_cloexec_flag(pipefd[1]);
845
976
if(ret < 0){
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
848
979
goto fallback;
849
980
}
850
981
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
852
985
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
855
988
goto fallback;
856
989
}
857
990
/* Starting a new process to be watched */
858
pid_t pid = fork();
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
859
995
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
862
998
goto fallback;
863
999
}
864
1000
if(pid == 0){
865
1001
/* this is the child process */
866
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1003
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
870
1006
}
871
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1008
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
875
1011
}
876
1012
877
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1014
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
881
1017
}
882
1018
883
1019
if(dirfd(dir) < 0){
887
1023
}
888
1024
if(p->environ[0] == NULL){
889
1025
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
892
1028
}
893
1029
} else {
894
1030
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
897
1033
}
898
1034
}
899
1035
/* no return */
900
1036
}
901
1037
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
903
1040
free(filename);
904
1041
plugin *new_plugin = getplugin(dirst->d_name);
905
1042
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
908
1047
if(ret < 0){
909
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
910
1049
}
911
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
912
1051
goto fallback;
913
1052
}
914
1053
917
1056
918
1057
/* Unblock SIGCHLD so signal handler can be run if this process
919
1058
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
921
1062
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
924
1065
goto fallback;
925
1066
}
926
1067
927
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
928
1070
929
1071
if(maxfd < new_plugin->fd){
930
1072
maxfd = new_plugin->fd;
931
1073
}
932
1074
}
933
1075
934
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
935
1077
dir = NULL;
1078
free_plugin(getplugin(NULL));
936
1079
937
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1081
if(p->pid != 0){
949
1092
while(plugin_list){
950
1093
fd_set rfds = rfds_all;
951
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
955
1098
goto fallback;
956
1099
}
957
1100
/* OK, now either a process completed, or something can be read
958
1101
from one of them */
959
1102
for(plugin *proc = plugin_list; proc != NULL;){
960
1103
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
962
1105
/* Only accept the plugin output if it exited cleanly */
963
1106
if(not WIFEXITED(proc->status)
964
1107
or WEXITSTATUS(proc->status) != 0){
965
1108
/* Bad exit by plugin */
966
1109
967
1110
if(debug){
968
1111
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
971
1115
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
976
1122
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
979
1125
}
980
1126
}
981
1127
982
1128
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
985
1132
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
987
1137
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
990
1140
goto fallback;
991
1141
}
992
1142
995
1145
proc = next_plugin;
996
1146
997
1147
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
1000
1151
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1003
1154
goto fallback;
1004
1155
}
1005
1156
1015
1166
bool bret = print_out_password(proc->buffer,
1016
1167
proc->buffer_length);
1017
1168
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1020
1171
}
1021
1172
goto fallback;
1022
1173
}
1023
1174
1024
1175
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1026
1179
/* This process had nothing to say at this time */
1027
1180
proc = proc->next;
1028
1181
continue;
1032
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
1186
+ (size_t) BUFFER_SIZE);
1034
1187
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1037
1190
goto fallback;
1038
1191
}
1039
1192
proc->buffer_size += BUFFER_SIZE;
1040
1193
}
1041
1194
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1044
1199
if(sret < 0){
1045
1200
/* Read error from this process; ignore the error */
1046
1201
proc = proc->next;
1054
1209
}
1055
1210
}
1056
1211
}
1057
1058
1212
1213
1059
1214
fallback:
1060
1215
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1062
1218
/* Fallback if all plugins failed, none are found or an error
1063
1219
occured */
1064
1220
bool bret;
1072
1228
}
1073
1229
bret = print_out_password(passwordbuffer, len);
1074
1230
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1077
1233
}
1078
1234
}
1079
1235
1080
1236
/* Restore old signal handler */
1081
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1238
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1085
1241
}
1086
1242
1087
1243
if(custom_argv != NULL){
1102
1258
ret = kill(p->pid, SIGTERM);
1103
1259
if(ret == -1 and errno != ESRCH){
1104
1260
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1261
error(0, errno, "kill");
1106
1262
}
1107
1263
}
1108
1264
}
1109
1265
1110
1266
/* Wait for any remaining child processes to terminate */
1111
do{
1267
do {
1112
1268
ret = wait(NULL);
1113
1269
} while(ret >= 0);
1114
1270
if(errno != ECHILD){
1115
perror("wait");
1271
error(0, errno, "wait");
1116
1272
}
1117
1273
1118
1274
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0