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- Committer: Teddy Hogeborn
- Date: 2009-02-12 06:09:24 UTC
- Revision ID: teddy@fukt.bsnet.se-20090212060924-vwxgitxnwr14w9e4
* mandos (Client.start_checker): Bug fix: Add extra check in case the
checker process completed quickly.
checker process completed quickly.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), 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(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
67
65
SIG_UNBLOCK, kill(), sig_atomic_t
68
66
*/
69
67
#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() */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
69
76
70
#define BUFFER_SIZE 256
77
71
79
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
74
81
75
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
77
84
78
typedef struct plugin{
85
79
char *name; /* can be NULL or any plugin name */
88
82
char **environ;
89
83
int envc;
90
84
bool disabled;
91
85
92
86
/* Variables used for running processes*/
93
87
pid_t pid;
94
88
int fd;
106
100
/* Gets an existing plugin based on name,
107
101
or if none is found, creates a new one */
108
102
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
103
/* Check for exiting plugin with that name */
110
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
105
if((p->name == name)
112
106
or (p->name and name and (strcmp(p->name, name) == 0))){
114
108
}
115
109
}
116
110
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
111
plugin *new_plugin = malloc(sizeof(plugin));
121
112
if(new_plugin == NULL){
122
113
return NULL;
123
114
}
124
115
char *copy_name = NULL;
125
116
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
129
118
if(copy_name == NULL){
130
int e = errno;
131
119
free(new_plugin);
132
errno = e;
133
120
return NULL;
134
121
}
135
122
}
139
126
.disabled = false,
140
127
.next = plugin_list };
141
128
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
145
130
if(new_plugin->argv == NULL){
146
int e = errno;
147
131
free(copy_name);
148
132
free(new_plugin);
149
errno = e;
150
133
return NULL;
151
134
}
152
135
new_plugin->argv[0] = copy_name;
153
136
new_plugin->argv[1] = NULL;
154
137
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
158
139
if(new_plugin->environ == NULL){
159
int e = errno;
160
140
free(copy_name);
161
141
free(new_plugin->argv);
162
142
free(new_plugin);
163
errno = e;
164
143
return NULL;
165
144
}
166
145
new_plugin->environ[0] = NULL;
171
150
}
172
151
173
152
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
153
static bool add_to_char_array(const char *new, char ***array,
176
154
int *len){
177
155
/* Resize the pointed-to array to hold one more pointer */
178
char **new_array = NULL;
179
do {
180
new_array = realloc(*array, sizeof(char *)
181
* (size_t) ((*len) + 2));
182
} while(new_array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
183
158
/* Malloc check */
184
if(new_array == NULL){
159
if(*array == NULL){
185
160
return false;
186
161
}
187
*array = new_array;
188
162
/* Make a copy of the new string */
189
char *copy;
190
do {
191
copy = strdup(new);
192
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
193
164
if(copy == NULL){
194
165
return false;
195
166
}
202
173
}
203
174
204
175
/* Add to a plugin's argument vector */
205
__attribute__((nonnull(2)))
206
176
static bool add_argument(plugin *p, const char *arg){
207
177
if(p == NULL){
208
178
return false;
211
181
}
212
182
213
183
/* Add to a plugin's environment */
214
__attribute__((nonnull(2)))
215
184
static bool add_environment(plugin *p, const char *def, bool replace){
216
185
if(p == NULL){
217
186
return false;
219
188
/* namelen = length of name of environment variable */
220
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
221
190
/* Search for this environment variable */
222
for(char **envdef = p->environ; *envdef != NULL; envdef++){
223
if(strncmp(*envdef, def, namelen + 1) == 0){
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
224
193
/* It already exists */
225
194
if(replace){
226
char *new_envdef;
227
do {
228
new_envdef = realloc(*envdef, strlen(def) + 1);
229
} while(new_envdef == NULL and errno == EINTR);
230
if(new_envdef == NULL){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
231
197
return false;
232
198
}
233
*envdef = new_envdef;
234
strcpy(*envdef, def);
199
*e = new;
200
strcpy(*e, def);
235
201
}
236
202
return true;
237
203
}
242
208
/*
243
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
244
210
* Descriptor Flags".
245
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
212
*/
247
213
static int set_cloexec_flag(int fd){
248
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
249
215
/* If reading the flags failed, return error indication now. */
250
216
if(ret < 0){
251
217
return ret;
252
218
}
253
219
/* Store modified flag word in the descriptor. */
254
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
255
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
221
}
257
222
258
223
273
238
/* No child processes */
274
239
break;
275
240
}
276
error(0, errno, "waitpid");
241
perror("waitpid");
277
242
}
278
243
279
244
/* A child exited, find it in process_list */
291
256
}
292
257
293
258
/* Prints out a password to stdout */
294
__attribute__((nonnull))
295
259
static bool print_out_password(const char *buffer, size_t length){
296
260
ssize_t ret;
297
261
for(size_t written = 0; written < length; written += (size_t)ret){
305
269
}
306
270
307
271
/* Removes and free a plugin from the plugin list */
308
__attribute__((nonnull))
309
272
static void free_plugin(plugin *plugin_node){
310
273
311
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
280
}
318
281
free(plugin_node->environ);
319
282
free(plugin_node->buffer);
320
283
321
284
/* Removes the plugin from the singly-linked list */
322
285
if(plugin_node == plugin_list){
323
286
/* First one - simple */
350
313
struct dirent *dirst;
351
314
struct stat st;
352
315
fd_set rfds_all;
353
int ret, maxfd = 0;
316
int ret, numchars, maxfd = 0;
354
317
ssize_t sret;
318
intmax_t tmpmax;
355
319
uid_t uid = 65534;
356
320
gid_t gid = 65534;
357
321
bool debug = false;
366
330
sigemptyset(&sigchld_action.sa_mask);
367
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
368
332
if(ret == -1){
369
error(0, errno, "sigaddset");
370
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
371
335
goto fallback;
372
336
}
373
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
374
338
if(ret == -1){
375
error(0, errno, "sigaction");
376
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
377
341
goto fallback;
378
342
}
379
343
411
375
.doc = "Group ID the plugins will run as", .group = 3 },
412
376
{ .name = "debug", .key = 132,
413
377
.doc = "Debug mode", .group = 4 },
414
/*
415
* These reproduce what we would get without ARGP_NO_HELP
416
*/
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
423
378
{ .name = NULL }
424
379
};
425
380
426
__attribute__((nonnull(3)))
427
error_t parse_opt(int key, char *arg, struct argp_state *state){
428
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
429
383
switch(key){
430
char *tmp;
431
intmax_t tmp_id;
432
384
case 'g': /* --global-options */
433
{
385
if(arg != NULL){
434
386
char *plugin_option;
435
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
436
391
if(not add_argument(getplugin(NULL), plugin_option)){
437
break;
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
438
394
}
439
395
}
440
396
}
441
397
break;
442
398
case 'G': /* --global-env */
443
add_environment(getplugin(NULL), arg, true);
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
444
405
break;
445
406
case 'o': /* --options-for */
446
{
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
450
errno = EINVAL;
451
break;
452
}
453
*option_list = '\0';
454
option_list++;
455
if(arg[0] == '\0'){
456
argp_error(state, "Empty plugin name");
457
errno = EINVAL;
458
break;
459
}
460
char *option;
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
463
break;
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
464
417
}
465
418
}
466
419
}
467
420
break;
468
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
469
425
{
470
426
char *envdef = strchr(arg, ':');
471
427
if(envdef == NULL){
472
argp_error(state, "No colon in \"%s\"", arg);
473
errno = EINVAL;
474
428
break;
475
429
}
476
430
*envdef = '\0';
477
envdef++;
478
if(arg[0] == '\0'){
479
argp_error(state, "Empty plugin name");
480
errno = EINVAL;
481
break;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
482
433
}
483
add_environment(getplugin(arg), envdef, true);
484
434
}
485
435
break;
486
436
case 'd': /* --disable */
487
{
437
if(arg != NULL){
488
438
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = true;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
491
441
}
442
p->disabled = true;
492
443
}
493
444
break;
494
445
case 'e': /* --enable */
495
{
446
if(arg != NULL){
496
447
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = false;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
499
450
}
451
p->disabled = false;
500
452
}
501
453
break;
502
454
case 128: /* --plugin-dir */
503
455
free(plugindir);
504
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
505
460
break;
506
461
case 129: /* --config-file */
507
462
/* This is already done by parse_opt_config_file() */
508
463
break;
509
464
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
515
break;
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
516
472
}
517
uid = (uid_t)tmp_id;
518
473
break;
519
474
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
521
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
525
break;
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
526
482
}
527
gid = (gid_t)tmp_id;
528
483
break;
529
484
case 132: /* --debug */
530
485
debug = true;
531
486
break;
532
/*
533
* These reproduce what we would get without ARGP_NO_HELP
534
*/
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
544
exit(EXIT_SUCCESS);
545
break;
546
487
/*
547
488
* When adding more options before this line, remember to also add a
548
489
* "case" to the "parse_opt_config_file" function below.
551
492
/* Cryptsetup always passes an argument, which is an empty
552
493
string if "none" was specified in /etc/crypttab. So if
553
494
argument was empty, we ignore it silently. */
554
if(arg[0] == '\0'){
555
break;
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
556
497
}
498
break;
499
case ARGP_KEY_END:
500
break;
557
501
default:
558
502
return ARGP_ERR_UNKNOWN;
559
503
}
560
return errno; /* Set to 0 at start */
504
return 0;
561
505
}
562
506
563
507
/* This option parser is the same as parse_opt() above, except it
565
509
error_t parse_opt_config_file(int key, char *arg,
566
510
__attribute__((unused))
567
511
struct argp_state *state){
568
errno = 0;
569
512
switch(key){
570
513
case 'g': /* --global-options */
571
514
case 'G': /* --global-env */
578
521
case 129: /* --config-file */
579
522
free(argfile);
580
523
argfile = strdup(arg);
581
break;
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
582
528
case 130: /* --userid */
583
529
case 131: /* --groupid */
584
530
case 132: /* --debug */
585
case '?': /* --help */
586
case -3: /* --usage */
587
case 'V': /* --version */
588
531
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
589
533
break;
590
534
default:
591
535
return ARGP_ERR_UNKNOWN;
592
536
}
593
return errno;
537
return 0;
594
538
}
595
539
596
540
struct argp argp = { .options = options,
600
544
601
545
/* Parse using parse_opt_config_file() in order to get the custom
602
546
config file location, if any. */
603
ret = argp_parse(&argp, argc, argv,
604
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
605
NULL, NULL);
606
switch(ret){
607
case 0:
608
break;
609
case ENOMEM:
610
default:
611
errno = ret;
612
error(0, errno, "argp_parse");
613
exitstatus = EX_OSERR;
614
goto fallback;
615
case EINVAL:
616
exitstatus = EX_USAGE;
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
617
551
goto fallback;
618
552
}
619
553
625
559
conffp = fopen(AFILE, "r");
626
560
} else {
627
561
conffp = fopen(argfile, "r");
628
}
562
}
629
563
if(conffp != NULL){
630
564
char *org_line = NULL;
631
565
char *p, *arg, *new_arg, *line;
632
566
size_t size = 0;
633
567
const char whitespace_delims[] = " \r\t\f\v\n";
634
568
const char comment_delim[] = "#";
635
569
636
570
custom_argc = 1;
637
571
custom_argv = malloc(sizeof(char*) * 2);
638
572
if(custom_argv == NULL){
639
error(0, errno, "malloc");
640
exitstatus = EX_OSERR;
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
641
575
goto fallback;
642
576
}
643
577
custom_argv[0] = argv[0];
644
578
custom_argv[1] = NULL;
645
579
646
580
/* for each line in the config file, strip whitespace and ignore
647
581
commented text */
648
582
while(true){
650
584
if(sret == -1){
651
585
break;
652
586
}
653
587
654
588
line = org_line;
655
589
arg = strsep(&line, comment_delim);
656
590
while((p = strsep(&arg, whitespace_delims)) != NULL){
659
593
}
660
594
new_arg = strdup(p);
661
595
if(new_arg == NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
664
598
free(org_line);
665
599
goto fallback;
666
600
}
667
601
668
602
custom_argc += 1;
669
{
670
char **new_argv = realloc(custom_argv, sizeof(char *)
671
* ((unsigned int)
672
custom_argc + 1));
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
676
free(new_arg);
677
free(org_line);
678
goto fallback;
679
} else {
680
custom_argv = new_argv;
681
}
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
682
610
}
683
611
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
612
custom_argv[custom_argc] = NULL;
685
613
}
686
614
}
687
do {
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
690
if(ret == EOF){
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
693
goto fallback;
694
}
695
615
free(org_line);
696
616
} else {
697
617
/* Check for harmful errors and go to fallback. Other errors might
698
618
not affect opening plugins */
699
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
702
622
goto fallback;
703
623
}
704
624
}
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
707
627
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
710
NULL, NULL);
711
switch(ret){
712
case 0:
713
break;
714
case ENOMEM:
715
default:
716
errno = ret;
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
719
goto fallback;
720
case EINVAL:
721
exitstatus = EX_CONFIG;
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
722
633
goto fallback;
723
634
}
724
635
}
725
636
726
637
/* Parse actual command line arguments, to let them override the
727
638
config file */
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
730
NULL, NULL);
731
switch(ret){
732
case 0:
733
break;
734
case ENOMEM:
735
default:
736
errno = ret;
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
739
goto fallback;
740
case EINVAL:
741
exitstatus = EX_USAGE;
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
742
643
goto fallback;
743
644
}
744
645
756
657
}
757
658
}
758
659
759
if(getuid() == 0){
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
765
} else {
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
767
if(ret == -1){
768
error(0, errno, "fstat");
769
} else {
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
772
if(ret == -1){
773
error(0, errno, "fchown");
774
}
775
}
776
}
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
778
}
779
}
780
781
/* Lower permissions */
782
ret = setgid(gid);
660
/* Strip permissions down to nobody */
661
setgid(gid);
783
662
if(ret == -1){
784
error(0, errno, "setgid");
663
perror("setgid");
785
664
}
786
665
ret = setuid(uid);
787
666
if(ret == -1){
788
error(0, errno, "setuid");
789
}
790
791
/* Open plugin directory with close_on_exec flag */
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
792
683
{
793
int dir_fd = -1;
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
} else {
803
dir_fd = open(plugindir, O_RDONLY |
804
#ifdef O_CLOEXEC
805
O_CLOEXEC
806
#else /* not O_CLOEXEC */
807
0
808
#endif /* not O_CLOEXEC */
809
);
810
}
811
if(dir_fd == -1){
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
814
goto fallback;
815
}
816
817
#ifndef O_CLOEXEC
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
820
if(ret < 0){
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
824
goto fallback;
825
}
826
#endif /* O_CLOEXEC */
827
828
dir = fdopendir(dir_fd);
829
if(dir == NULL){
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
833
goto fallback;
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
691
}
834
692
}
835
693
}
836
694
838
696
839
697
/* Read and execute any executable in the plugin directory*/
840
698
while(true){
841
do {
842
dirst = readdir(dir);
843
} while(dirst == NULL and errno == EINTR);
699
dirst = readdir(dir);
844
700
845
701
/* All directory entries have been processed */
846
702
if(dirst == NULL){
847
703
if(errno == EBADF){
848
error(0, errno, "readdir");
849
exitstatus = EX_IOERR;
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
850
706
goto fallback;
851
707
}
852
708
break;
858
714
{
859
715
bool bad_name = false;
860
716
861
const char * const bad_prefixes[] = { ".", "#", NULL };
717
const char const *bad_prefixes[] = { ".", "#", NULL };
862
718
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
864
720
".dpkg-old",
865
721
".dpkg-bak",
866
722
".dpkg-divert", NULL };
867
#ifdef __GNUC__
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
870
#endif
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
873
#ifdef __GNUC__
874
#pragma GCC diagnostic pop
875
#endif
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
876
724
size_t pre_len = strlen(*pre);
877
725
if((d_name_len >= pre_len)
878
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
887
735
if(bad_name){
888
736
continue;
889
737
}
890
#ifdef __GNUC__
891
#pragma GCC diagnostic push
892
#pragma GCC diagnostic ignored "-Wcast-qual"
893
#endif
894
for(const char **suf = (const char **)bad_suffixes;
895
*suf != NULL; suf++){
896
#ifdef __GNUC__
897
#pragma GCC diagnostic pop
898
#endif
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
899
739
size_t suf_len = strlen(*suf);
900
740
if((d_name_len >= suf_len)
901
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
902
742
== 0)){
903
743
if(debug){
904
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
753
continue;
914
754
}
915
755
}
916
756
917
757
char *filename;
918
758
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
920
dirst->d_name));
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
921
760
} else {
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
923
plugindir,
924
dirst->d_name));
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
925
762
}
926
763
if(ret < 0){
927
error(0, errno, "asprintf");
764
perror("asprintf");
928
765
continue;
929
766
}
930
767
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
768
ret = stat(filename, &st);
932
769
if(ret == -1){
933
error(0, errno, "stat");
770
perror("stat");
934
771
free(filename);
935
772
continue;
936
773
}
937
774
938
775
/* Ignore non-executable files */
939
if(not S_ISREG(st.st_mode)
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
941
777
if(debug){
942
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
779
" with bad type or mode\n", filename);
948
784
949
785
plugin *p = getplugin(dirst->d_name);
950
786
if(p == NULL){
951
error(0, errno, "getplugin");
787
perror("getplugin");
952
788
free(filename);
953
789
continue;
954
790
}
966
802
if(g != NULL){
967
803
for(char **a = g->argv + 1; *a != NULL; a++){
968
804
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
805
perror("add_argument");
970
806
}
971
807
}
972
808
/* Add global environment variables */
973
809
for(char **e = g->environ; *e != NULL; e++){
974
810
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
811
perror("add_environment");
976
812
}
977
813
}
978
814
}
983
819
if(p->environ[0] != NULL){
984
820
for(char **e = environ; *e != NULL; e++){
985
821
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
822
perror("add_environment");
987
823
}
988
824
}
989
825
}
990
826
991
827
int pipefd[2];
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
828
ret = pipe(pipefd);
993
829
if(ret == -1){
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
996
832
goto fallback;
997
833
}
998
834
/* Ask OS to automatic close the pipe on exec */
999
835
ret = set_cloexec_flag(pipefd[0]);
1000
836
if(ret < 0){
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
1003
839
goto fallback;
1004
840
}
1005
841
ret = set_cloexec_flag(pipefd[1]);
1006
842
if(ret < 0){
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1009
845
goto fallback;
1010
846
}
1011
847
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
1014
NULL));
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1015
849
if(ret < 0){
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
1018
852
goto fallback;
1019
853
}
1020
854
/* Starting a new process to be watched */
1021
pid_t pid;
1022
do {
1023
pid = fork();
1024
} while(pid == -1 and errno == EINTR);
855
pid_t pid = fork();
1025
856
if(pid == -1){
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1028
859
goto fallback;
1029
860
}
1030
861
if(pid == 0){
1031
862
/* this is the child process */
1032
863
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1033
864
if(ret < 0){
1034
error(0, errno, "sigaction");
1035
_exit(EX_OSERR);
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1036
867
}
1037
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
869
if(ret < 0){
1039
error(0, errno, "sigprocmask");
1040
_exit(EX_OSERR);
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1041
872
}
1042
873
1043
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1044
875
if(ret == -1){
1045
error(0, errno, "dup2");
1046
_exit(EX_OSERR);
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1047
878
}
1048
879
1049
880
if(dirfd(dir) < 0){
1053
884
}
1054
885
if(p->environ[0] == NULL){
1055
886
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1057
_exit(EX_OSERR);
887
perror("execv");
888
_exit(EXIT_FAILURE);
1058
889
}
1059
890
} else {
1060
891
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1062
_exit(EX_OSERR);
892
perror("execve");
893
_exit(EXIT_FAILURE);
1063
894
}
1064
895
}
1065
896
/* no return */
1066
897
}
1067
898
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1069
pipe */
899
close(pipefd[1]); /* Close unused write end of pipe */
1070
900
free(filename);
1071
901
plugin *new_plugin = getplugin(dirst->d_name);
1072
902
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
NULL)));
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
905
if(ret < 0){
1078
error(0, errno, "sigprocmask");
906
perror("sigprocmask");
1079
907
}
1080
exitstatus = EX_OSERR;
908
exitstatus = EXIT_FAILURE;
1081
909
goto fallback;
1082
910
}
1083
911
1086
914
1087
915
/* Unblock SIGCHLD so signal handler can be run if this process
1088
916
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
1091
NULL));
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
918
if(ret < 0){
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1095
921
goto fallback;
1096
922
}
1097
923
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1102
#endif
1103
#endif
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1106
before 2.16 */
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
1110
#endif
1111
#endif
924
FD_SET(new_plugin->fd, &rfds_all);
1112
925
1113
926
if(maxfd < new_plugin->fd){
1114
927
maxfd = new_plugin->fd;
1115
928
}
1116
929
}
1117
930
1118
TEMP_FAILURE_RETRY(closedir(dir));
931
closedir(dir);
1119
932
dir = NULL;
1120
933
free_plugin(getplugin(NULL));
1121
934
1134
947
while(plugin_list){
1135
948
fd_set rfds = rfds_all;
1136
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1137
if(select_ret == -1 and errno != EINTR){
1138
error(0, errno, "select");
1139
exitstatus = EX_OSERR;
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1140
953
goto fallback;
1141
954
}
1142
955
/* OK, now either a process completed, or something can be read
1148
961
if(not WIFEXITED(proc->status)
1149
962
or WEXITSTATUS(proc->status) != 0){
1150
963
/* Bad exit by plugin */
1151
964
1152
965
if(debug){
1153
966
if(WIFEXITED(proc->status)){
1154
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1157
970
WEXITSTATUS(proc->status));
1158
971
} else if(WIFSIGNALED(proc->status)){
1159
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1160
" signal %d: %s\n", proc->name,
973
" signal %d\n", proc->name,
1161
974
(intmax_t) (proc->pid),
1162
WTERMSIG(proc->status),
1163
strsignal(WTERMSIG(proc->status)));
975
WTERMSIG(proc->status));
1164
976
} else if(WCOREDUMP(proc->status)){
1165
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1166
978
" core\n", proc->name, (intmax_t) (proc->pid));
1168
980
}
1169
981
1170
982
/* Remove the plugin */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic push
1174
#pragma GCC diagnostic ignored "-Wsign-conversion"
1175
#endif
1176
#endif
1177
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1178
-Wconversion in GNU libc
1179
before 2.16 */
1180
#if defined (__GNUC__) and defined (__GLIBC__)
1181
#if not __GLIBC_PREREQ(2, 16)
1182
#pragma GCC diagnostic pop
1183
#endif
1184
#endif
1185
983
FD_CLR(proc->fd, &rfds_all);
984
1186
985
/* Block signal while modifying process_list */
1187
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1188
(SIG_BLOCK,
1189
&sigchld_action.sa_mask,
1190
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1191
987
if(ret < 0){
1192
error(0, errno, "sigprocmask");
1193
exitstatus = EX_OSERR;
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1194
990
goto fallback;
1195
991
}
1196
992
1199
995
proc = next_plugin;
1200
996
1201
997
/* We are done modifying process list, so unblock signal */
1202
ret = (int)(TEMP_FAILURE_RETRY
1203
(sigprocmask(SIG_UNBLOCK,
1204
&sigchld_action.sa_mask, NULL)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1205
1000
if(ret < 0){
1206
error(0, errno, "sigprocmask");
1207
exitstatus = EX_OSERR;
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1208
1003
goto fallback;
1209
1004
}
1210
1005
1220
1015
bool bret = print_out_password(proc->buffer,
1221
1016
proc->buffer_length);
1222
1017
if(not bret){
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1225
1020
}
1226
1021
goto fallback;
1227
1022
}
1228
1023
1229
1024
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1234
#endif
1235
#endif
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1237
warning from
1238
-Wconversion
1239
in GNU libc
1240
before
1241
2.16 */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
1245
#endif
1246
#endif
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
1026
/* This process had nothing to say at this time */
1248
1027
proc = proc->next;
1249
1028
continue;
1250
1029
}
1251
1030
/* Before reading, make the process' data buffer large enough */
1252
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1258
1037
goto fallback;
1259
1038
}
1260
proc->buffer = new_buffer;
1261
1039
proc->buffer_size += BUFFER_SIZE;
1262
1040
}
1263
1041
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1265
proc->buffer
1266
+ proc->buffer_length,
1267
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1268
1044
if(sret < 0){
1269
1045
/* Read error from this process; ignore the error */
1270
1046
proc = proc->next;
1278
1054
}
1279
1055
}
1280
1056
}
1281
1282
1057
1058
1283
1059
fallback:
1284
1060
1285
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1286
and exitstatus != EX_OK)){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1287
1062
/* Fallback if all plugins failed, none are found or an error
1288
1063
occured */
1289
1064
bool bret;
1297
1072
}
1298
1073
bret = print_out_password(passwordbuffer, len);
1299
1074
if(not bret){
1300
error(0, errno, "print_out_password");
1301
exitstatus = EX_IOERR;
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1302
1077
}
1303
1078
}
1304
1079
1305
1080
/* Restore old signal handler */
1306
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1307
1082
if(ret == -1){
1308
error(0, errno, "sigaction");
1309
exitstatus = EX_OSERR;
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1310
1085
}
1311
1086
1312
1087
if(custom_argv != NULL){
1327
1102
ret = kill(p->pid, SIGTERM);
1328
1103
if(ret == -1 and errno != ESRCH){
1329
1104
/* Set-uid proccesses might not get closed */
1330
error(0, errno, "kill");
1105
perror("kill");
1331
1106
}
1332
1107
}
1333
1108
}
1334
1109
1335
1110
/* Wait for any remaining child processes to terminate */
1336
do {
1111
do{
1337
1112
ret = wait(NULL);
1338
1113
} while(ret >= 0);
1339
1114
if(errno != ECHILD){
1340
error(0, errno, "wait");
1115
perror("wait");
1341
1116
}
1342
1117
1343
1118
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0