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- Committer: Teddy Hogeborn
- Date: 2011-11-24 20:15:24 UTC
- mto: (237.15.8 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- 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 renamed:
- mandos-list => mandos-ctl
- 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 */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
67
75
68
76
#define BUFFER_SIZE 256
69
77
71
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
80
73
81
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
83
76
84
typedef struct plugin{
77
85
char *name; /* can be NULL or any plugin name */
80
88
char **environ;
81
89
int envc;
82
90
bool disabled;
83
91
84
92
/* Variables used for running processes*/
85
93
pid_t pid;
86
94
int fd;
88
96
size_t buffer_size;
89
97
size_t buffer_length;
90
98
bool eof;
91
volatile bool completed;
92
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
98
106
/* Gets an existing plugin based on name,
99
107
or if none is found, creates a new one */
100
108
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
105
113
return p;
106
114
}
107
115
}
108
116
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
111
122
return NULL;
112
123
}
113
124
char *copy_name = NULL;
114
125
if(name != NULL){
115
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
117
133
return NULL;
118
134
}
119
135
}
120
136
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
125
141
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
128
147
free(copy_name);
129
148
free(new_plugin);
149
errno = e;
130
150
return NULL;
131
151
}
132
152
new_plugin->argv[0] = copy_name;
133
153
new_plugin->argv[1] = NULL;
134
154
135
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
158
if(new_plugin->environ == NULL){
159
int e = errno;
137
160
free(copy_name);
138
161
free(new_plugin->argv);
139
162
free(new_plugin);
163
errno = e;
140
164
return NULL;
141
165
}
142
166
new_plugin->environ[0] = NULL;
150
174
static bool add_to_char_array(const char *new, char ***array,
151
175
int *len){
152
176
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
155
181
/* Malloc check */
156
182
if(*array == NULL){
157
183
return false;
158
184
}
159
185
/* Make a copy of the new string */
160
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
161
190
if(copy == NULL){
162
191
return false;
163
192
}
189
218
if(strncmp(*e, def, namelen + 1) == 0){
190
219
/* It already exists */
191
220
if(replace){
192
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);
193
225
if(new == NULL){
194
226
return false;
195
227
}
205
237
/*
206
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
239
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
241
*/
210
242
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
244
/* If reading the flags failed, return error indication now. */
213
245
if(ret < 0){
214
246
return ret;
215
247
}
216
248
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
218
251
}
219
252
220
253
221
254
/* Mark processes as completed when they exit, and save their exit
222
255
status. */
223
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
224
258
while(true){
225
259
plugin *proc = plugin_list;
226
260
int status;
230
264
break;
231
265
}
232
266
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
235
270
}
236
/* No child processes */
237
break;
271
error(0, errno, "waitpid");
238
272
}
239
273
240
274
/* A child exited, find it in process_list */
246
280
continue;
247
281
}
248
282
proc->status = status;
249
proc->completed = true;
283
proc->completed = 1;
250
284
}
285
errno = old_errno;
251
286
}
252
287
253
288
/* Prints out a password to stdout */
275
310
}
276
311
free(plugin_node->environ);
277
312
free(plugin_node->buffer);
278
313
279
314
/* Removes the plugin from the singly-linked list */
280
315
if(plugin_node == plugin_list){
281
316
/* First one - simple */
309
344
struct stat st;
310
345
fd_set rfds_all;
311
346
int ret, maxfd = 0;
347
ssize_t sret;
312
348
uid_t uid = 65534;
313
349
gid_t gid = 65534;
314
350
bool debug = false;
323
359
sigemptyset(&sigchld_action.sa_mask);
324
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
325
361
if(ret == -1){
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
328
364
goto fallback;
329
365
}
330
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
331
367
if(ret == -1){
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
334
370
goto fallback;
335
371
}
336
372
368
404
.doc = "Group ID the plugins will run as", .group = 3 },
369
405
{ .name = "debug", .key = 132,
370
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 },
371
416
{ .name = NULL }
372
417
};
373
418
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
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;
377
424
case 'g': /* --global-options */
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
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;
387
430
}
388
431
}
389
432
}
390
433
break;
391
434
case 'G': /* --global-env */
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
397
}
435
add_environment(getplugin(NULL), arg, true);
398
436
break;
399
437
case 'o': /* --options-for */
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
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;
417
456
}
418
457
}
419
458
}
420
459
break;
421
460
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
461
{
426
462
char *envdef = strchr(arg, ':');
427
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
428
466
break;
429
467
}
430
468
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
433
474
}
475
add_environment(getplugin(arg), envdef, true);
434
476
}
435
477
break;
436
478
case 'd': /* --disable */
437
if (arg != NULL){
479
{
438
480
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
441
483
}
442
p->disabled = true;
443
484
}
444
485
break;
445
486
case 'e': /* --enable */
446
if (arg != NULL){
487
{
447
488
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
450
491
}
451
p->disabled = false;
452
492
}
453
493
break;
454
494
case 128: /* --plugin-dir */
455
495
free(plugindir);
456
496
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
497
break;
461
498
case 129: /* --config-file */
462
499
/* This is already done by parse_opt_config_file() */
463
500
break;
464
501
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
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;
508
}
509
uid = (uid_t)tmpmax;
466
510
break;
467
511
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
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;
518
}
519
gid = (gid_t)tmpmax;
469
520
break;
470
521
case 132: /* --debug */
471
522
debug = true;
472
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;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
473
542
case ARGP_KEY_ARG:
474
543
/* Cryptsetup always passes an argument, which is an empty
475
544
string if "none" was specified in /etc/crypttab. So if
476
545
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
479
548
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
549
default:
484
550
return ARGP_ERR_UNKNOWN;
485
551
}
486
return 0;
552
return errno; /* Set to 0 at start */
487
553
}
488
554
489
555
/* This option parser is the same as parse_opt() above, except it
490
556
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
495
562
case 'g': /* --global-options */
496
563
case 'G': /* --global-env */
497
564
case 'o': /* --options-for */
503
570
case 129: /* --config-file */
504
571
free(argfile);
505
572
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
573
break;
510
574
case 130: /* --userid */
511
575
case 131: /* --groupid */
512
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
513
580
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
581
break;
516
582
default:
517
583
return ARGP_ERR_UNKNOWN;
518
584
}
519
return 0;
585
return errno;
520
586
}
521
587
522
588
struct argp argp = { .options = options,
524
590
.args_doc = "",
525
591
.doc = "Mandos plugin runner -- Run plugins" };
526
592
527
/* Parse using the parse_opt_config_file in order to get the custom
593
/* Parse using parse_opt_config_file() in order to get the custom
528
594
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
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;
533
609
goto fallback;
534
610
}
535
611
537
613
argp.parser = parse_opt;
538
614
539
615
/* Open the configfile if available */
540
if (argfile == NULL){
616
if(argfile == NULL){
541
617
conffp = fopen(AFILE, "r");
542
618
} else {
543
619
conffp = fopen(argfile, "r");
544
}
620
}
545
621
if(conffp != NULL){
546
622
char *org_line = NULL;
547
623
char *p, *arg, *new_arg, *line;
548
624
size_t size = 0;
549
ssize_t sret;
550
625
const char whitespace_delims[] = " \r\t\f\v\n";
551
626
const char comment_delim[] = "#";
552
627
553
628
custom_argc = 1;
554
629
custom_argv = malloc(sizeof(char*) * 2);
555
630
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
558
633
goto fallback;
559
634
}
560
635
custom_argv[0] = argv[0];
561
636
custom_argv[1] = NULL;
562
637
563
638
/* for each line in the config file, strip whitespace and ignore
564
639
commented text */
565
640
while(true){
567
642
if(sret == -1){
568
643
break;
569
644
}
570
645
571
646
line = org_line;
572
647
arg = strsep(&line, comment_delim);
573
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
651
}
577
652
new_arg = strdup(p);
578
653
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
581
656
free(org_line);
582
657
goto fallback;
583
658
}
586
661
custom_argv = realloc(custom_argv, sizeof(char *)
587
662
* ((unsigned int) custom_argc + 1));
588
663
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
591
666
free(org_line);
592
667
goto fallback;
593
668
}
594
669
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
596
671
}
597
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
}
598
681
free(org_line);
599
682
} else {
600
683
/* Check for harmful errors and go to fallback. Other errors might
601
684
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
605
688
goto fallback;
606
689
}
607
690
}
608
/* If there was any arguments from configuration file,
609
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 */
610
693
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
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;
616
708
goto fallback;
617
709
}
618
710
}
619
711
620
712
/* Parse actual command line arguments, to let them override the
621
713
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
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;
626
728
goto fallback;
627
729
}
628
730
633
735
for(char **a = p->argv; *a != NULL; a++){
634
736
fprintf(stderr, "\tArg: %s\n", *a);
635
737
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
739
for(char **a = p->environ; *a != NULL; a++){
638
740
fprintf(stderr, "\t%s\n", *a);
639
741
}
640
742
}
641
743
}
642
744
643
/* 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
}
644
772
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
666
778
{
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
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;
675
820
}
676
821
}
677
822
679
824
680
825
/* Read and execute any executable in the plugin directory*/
681
826
while(true){
682
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
683
830
684
831
/* All directory entries have been processed */
685
832
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
689
836
goto fallback;
690
837
}
691
838
break;
721
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
869
size_t suf_len = strlen(*suf);
723
870
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
872
== 0)){
726
873
if(debug){
727
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
736
883
continue;
737
884
}
738
885
}
739
886
740
887
char *filename;
741
888
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
743
891
} else {
744
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));
745
895
}
746
896
if(ret < 0){
747
perror("asprintf");
897
error(0, errno, "asprintf");
748
898
continue;
749
899
}
750
900
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
754
904
free(filename);
755
905
continue;
756
906
}
757
907
758
908
/* Ignore non-executable files */
759
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)){
760
911
if(debug){
761
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
913
" with bad type or mode\n", filename);
767
918
768
919
plugin *p = getplugin(dirst->d_name);
769
920
if(p == NULL){
770
perror("getplugin");
921
error(0, errno, "getplugin");
771
922
free(filename);
772
923
continue;
773
924
}
785
936
if(g != NULL){
786
937
for(char **a = g->argv + 1; *a != NULL; a++){
787
938
if(not add_argument(p, *a)){
788
perror("add_argument");
939
error(0, errno, "add_argument");
789
940
}
790
941
}
791
942
/* Add global environment variables */
792
943
for(char **e = g->environ; *e != NULL; e++){
793
944
if(not add_environment(p, *e, false)){
794
perror("add_environment");
945
error(0, errno, "add_environment");
795
946
}
796
947
}
797
948
}
802
953
if(p->environ[0] != NULL){
803
954
for(char **e = environ; *e != NULL; e++){
804
955
if(not add_environment(p, *e, false)){
805
perror("add_environment");
956
error(0, errno, "add_environment");
806
957
}
807
958
}
808
959
}
809
960
810
961
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
815
966
goto fallback;
816
967
}
817
968
/* Ask OS to automatic close the pipe on exec */
818
969
ret = set_cloexec_flag(pipefd[0]);
819
970
if(ret < 0){
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
822
973
goto fallback;
823
974
}
824
975
ret = set_cloexec_flag(pipefd[1]);
825
976
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
828
979
goto fallback;
829
980
}
830
981
/* Block SIGCHLD until process is safely in process list */
831
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));
832
985
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
835
988
goto fallback;
836
989
}
837
990
/* Starting a new process to be watched */
838
pid_t pid = fork();
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
839
995
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
842
998
goto fallback;
843
999
}
844
1000
if(pid == 0){
845
1001
/* this is the child process */
846
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
1003
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
850
1006
}
851
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
1008
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
855
1011
}
856
1012
857
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
1014
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
861
1017
}
862
1018
863
1019
if(dirfd(dir) < 0){
867
1023
}
868
1024
if(p->environ[0] == NULL){
869
1025
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
872
1028
}
873
1029
} else {
874
1030
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
877
1033
}
878
1034
}
879
1035
/* no return */
880
1036
}
881
1037
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
883
1040
free(filename);
884
1041
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
888
1047
if(ret < 0){
889
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
890
1049
}
891
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
892
1051
goto fallback;
893
1052
}
894
1053
897
1056
898
1057
/* Unblock SIGCHLD so signal handler can be run if this process
899
1058
has already completed */
900
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));
901
1062
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
904
1065
goto fallback;
905
1066
}
906
1067
907
FD_SET(new_plugin->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
908
1070
909
if (maxfd < new_plugin->fd){
1071
if(maxfd < new_plugin->fd){
910
1072
maxfd = new_plugin->fd;
911
1073
}
912
1074
}
913
1075
914
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
915
1077
dir = NULL;
1078
free_plugin(getplugin(NULL));
916
1079
917
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
1081
if(p->pid != 0){
929
1092
while(plugin_list){
930
1093
fd_set rfds = rfds_all;
931
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
935
1098
goto fallback;
936
1099
}
937
1100
/* OK, now either a process completed, or something can be read
938
1101
from one of them */
939
1102
for(plugin *proc = plugin_list; proc != NULL;){
940
1103
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
942
1105
/* Only accept the plugin output if it exited cleanly */
943
1106
if(not WIFEXITED(proc->status)
944
1107
or WEXITSTATUS(proc->status) != 0){
945
1108
/* Bad exit by plugin */
946
1109
947
1110
if(debug){
948
1111
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
951
1115
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
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)));
956
1122
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
959
1125
}
960
1126
}
961
1127
962
1128
/* Remove the plugin */
963
FD_CLR(proc->fd, &rfds_all);
964
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
965
1132
/* Block signal while modifying process_list */
966
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));
967
1137
if(ret < 0){
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
970
1140
goto fallback;
971
1141
}
972
1142
975
1145
proc = next_plugin;
976
1146
977
1147
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
980
1151
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
983
1154
goto fallback;
984
1155
}
985
1156
995
1166
bool bret = print_out_password(proc->buffer,
996
1167
proc->buffer_length);
997
1168
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
1000
1171
}
1001
1172
goto fallback;
1002
1173
}
1003
1174
1004
1175
/* This process has not completed. Does it have any output? */
1005
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 */
1006
1179
/* This process had nothing to say at this time */
1007
1180
proc = proc->next;
1008
1181
continue;
1011
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
1186
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
1017
1190
goto fallback;
1018
1191
}
1019
1192
proc->buffer_size += BUFFER_SIZE;
1020
1193
}
1021
1194
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
1025
1200
/* Read error from this process; ignore the error */
1026
1201
proc = proc->next;
1027
1202
continue;
1028
1203
}
1029
if(ret == 0){
1204
if(sret == 0){
1030
1205
/* got EOF */
1031
1206
proc->eof = true;
1032
1207
} else {
1033
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
1034
1209
}
1035
1210
}
1036
1211
}
1037
1038
1212
1213
1039
1214
fallback:
1040
1215
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1042
1218
/* Fallback if all plugins failed, none are found or an error
1043
1219
occured */
1044
1220
bool bret;
1052
1228
}
1053
1229
bret = print_out_password(passwordbuffer, len);
1054
1230
if(not bret){
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
1057
1233
}
1058
1234
}
1059
1235
1060
1236
/* Restore old signal handler */
1061
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
1238
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
1065
1241
}
1066
1242
1067
1243
if(custom_argv != NULL){
1082
1258
ret = kill(p->pid, SIGTERM);
1083
1259
if(ret == -1 and errno != ESRCH){
1084
1260
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1261
error(0, errno, "kill");
1086
1262
}
1087
1263
}
1088
1264
}
1089
1265
1090
1266
/* Wait for any remaining child processes to terminate */
1091
do{
1267
do {
1092
1268
ret = wait(NULL);
1093
1269
} while(ret >= 0);
1094
1270
if(errno != ECHILD){
1095
perror("wait");
1271
error(0, errno, "wait");
1096
1272
}
1097
1273
1098
1274
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0