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- Committer: Teddy Hogeborn
- Date: 2014-05-11 20:10:08 UTC
- mfrom: (681 trunk)
- mto: This revision was merged to the branch mainline in revision 682.
- Revision ID: teddy@recompile.se-20140511201008-sriicp4qxr03uhln
Merge from trunk.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
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(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
42
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
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() */
75
#include <fnmatch.h> /* fnmatch() */
71
76
72
77
#define BUFFER_SIZE 256
73
78
75
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
81
77
82
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
84
80
85
typedef struct plugin{
81
86
char *name; /* can be NULL or any plugin name */
101
106
102
107
/* Gets an existing plugin based on name,
103
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
104
110
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
106
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
113
if((p->name == name)
108
114
or (p->name and name and (strcmp(p->name, name) == 0))){
123
129
copy_name = strdup(name);
124
130
} while(copy_name == NULL and errno == EINTR);
125
131
if(copy_name == NULL){
132
int e = errno;
126
133
free(new_plugin);
134
errno = e;
127
135
return NULL;
128
136
}
129
137
}
137
145
new_plugin->argv = malloc(sizeof(char *) * 2);
138
146
} while(new_plugin->argv == NULL and errno == EINTR);
139
147
if(new_plugin->argv == NULL){
148
int e = errno;
140
149
free(copy_name);
141
150
free(new_plugin);
151
errno = e;
142
152
return NULL;
143
153
}
144
154
new_plugin->argv[0] = copy_name;
148
158
new_plugin->environ = malloc(sizeof(char *));
149
159
} while(new_plugin->environ == NULL and errno == EINTR);
150
160
if(new_plugin->environ == NULL){
161
int e = errno;
151
162
free(copy_name);
152
163
free(new_plugin->argv);
153
164
free(new_plugin);
165
errno = e;
154
166
return NULL;
155
167
}
156
168
new_plugin->environ[0] = NULL;
161
173
}
162
174
163
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
164
177
static bool add_to_char_array(const char *new, char ***array,
165
178
int *len){
166
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
167
181
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
171
185
/* Malloc check */
172
if(*array == NULL){
186
if(new_array == NULL){
173
187
return false;
174
188
}
189
*array = new_array;
175
190
/* Make a copy of the new string */
176
191
char *copy;
177
192
do {
189
204
}
190
205
191
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
192
208
static bool add_argument(plugin *p, const char *arg){
193
209
if(p == NULL){
194
210
return false;
197
213
}
198
214
199
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
200
217
static bool add_environment(plugin *p, const char *def, bool replace){
201
218
if(p == NULL){
202
219
return false;
204
221
/* namelen = length of name of environment variable */
205
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
223
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
209
226
/* It already exists */
210
227
if(replace){
211
char *new;
228
char *new_envdef;
212
229
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
216
233
return false;
217
234
}
218
*e = new;
219
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
220
237
}
221
238
return true;
222
239
}
229
246
* Descriptor Flags".
230
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
231
248
*/
249
__attribute__((warn_unused_result))
232
250
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
252
/* If reading the flags failed, return error indication now. */
235
253
if(ret < 0){
236
254
return ret;
237
255
}
238
256
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
240
259
}
241
260
242
261
257
276
/* No child processes */
258
277
break;
259
278
}
260
perror("waitpid");
279
error(0, errno, "waitpid");
261
280
}
262
281
263
282
/* A child exited, find it in process_list */
275
294
}
276
295
277
296
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
278
298
static bool print_out_password(const char *buffer, size_t length){
279
299
ssize_t ret;
280
300
for(size_t written = 0; written < length; written += (size_t)ret){
288
308
}
289
309
290
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
291
312
static void free_plugin(plugin *plugin_node){
292
313
293
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
348
char *plugindir = NULL;
328
349
char *argfile = NULL;
329
350
FILE *conffp;
330
size_t d_name_len;
331
351
DIR *dir = NULL;
332
352
struct dirent *dirst;
333
353
struct stat st;
343
363
.sa_flags = SA_NOCLDSTOP };
344
364
char **custom_argv = NULL;
345
365
int custom_argc = 0;
366
int dir_fd;
346
367
347
368
/* Establish a signal handler */
348
369
sigemptyset(&sigchld_action.sa_mask);
349
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
350
371
if(ret == -1){
351
perror("sigaddset");
352
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
353
374
goto fallback;
354
375
}
355
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
356
377
if(ret == -1){
357
perror("sigaction");
358
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
359
380
goto fallback;
360
381
}
361
382
393
414
.doc = "Group ID the plugins will run as", .group = 3 },
394
415
{ .name = "debug", .key = 132,
395
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
396
426
{ .name = NULL }
397
427
};
398
428
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
401
432
switch(key){
402
433
char *tmp;
403
intmax_t tmpmax;
434
intmax_t tmp_id;
404
435
case 'g': /* --global-options */
405
if(arg != NULL){
436
{
406
437
char *plugin_option;
407
438
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
409
continue;
410
}
411
439
if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
440
break;
414
441
}
415
442
}
443
errno = 0;
416
444
}
417
445
break;
418
446
case 'G': /* --global-env */
419
if(arg == NULL){
420
break;
421
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
424
449
}
425
450
break;
426
451
case 'o': /* --options-for */
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
437
470
}
438
471
}
472
errno = 0;
439
473
}
440
474
break;
441
475
case 'E': /* --env-for */
442
if(arg == NULL){
443
break;
444
}
445
476
{
446
477
char *envdef = strchr(arg, ':');
447
478
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
448
481
break;
449
482
}
450
483
*envdef = '\0';
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
453
492
}
454
493
}
455
494
break;
456
495
case 'd': /* --disable */
457
if(arg != NULL){
496
{
458
497
plugin *p = getplugin(arg);
459
if(p == NULL){
460
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
461
501
}
462
p->disabled = true;
463
502
}
464
503
break;
465
504
case 'e': /* --enable */
466
if(arg != NULL){
505
{
467
506
plugin *p = getplugin(arg);
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
470
510
}
471
p->disabled = false;
472
511
}
473
512
break;
474
513
case 128: /* --plugin-dir */
475
514
free(plugindir);
476
515
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
516
if(plugindir != NULL){
517
errno = 0;
479
518
}
480
519
break;
481
520
case 129: /* --config-file */
482
521
/* This is already done by parse_opt_config_file() */
483
522
break;
484
523
case 130: /* --userid */
485
errno = 0;
486
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
487
525
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
493
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
494
533
break;
495
534
case 131: /* --groupid */
496
errno = 0;
497
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
498
536
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
504
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
505
544
break;
506
545
case 132: /* --debug */
507
546
debug = true;
508
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
509
562
/*
510
563
* When adding more options before this line, remember to also add a
511
564
* "case" to the "parse_opt_config_file" function below.
514
567
/* Cryptsetup always passes an argument, which is an empty
515
568
string if "none" was specified in /etc/crypttab. So if
516
569
argument was empty, we ignore it silently. */
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
570
if(arg[0] == '\0'){
571
break;
519
572
}
520
break;
521
case ARGP_KEY_END:
522
break;
523
573
default:
524
574
return ARGP_ERR_UNKNOWN;
525
575
}
526
return 0;
576
return errno; /* Set to 0 at start */
527
577
}
528
578
529
579
/* This option parser is the same as parse_opt() above, except it
531
581
error_t parse_opt_config_file(int key, char *arg,
532
582
__attribute__((unused))
533
583
struct argp_state *state){
584
errno = 0;
534
585
switch(key){
535
586
case 'g': /* --global-options */
536
587
case 'G': /* --global-env */
543
594
case 129: /* --config-file */
544
595
free(argfile);
545
596
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
548
599
}
549
600
break;
550
601
case 130: /* --userid */
551
602
case 131: /* --groupid */
552
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
553
607
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
555
608
break;
556
609
default:
557
610
return ARGP_ERR_UNKNOWN;
558
611
}
559
return 0;
612
return errno;
560
613
}
561
614
562
615
struct argp argp = { .options = options,
566
619
567
620
/* Parse using parse_opt_config_file() in order to get the custom
568
621
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
573
636
goto fallback;
574
637
}
575
638
592
655
custom_argc = 1;
593
656
custom_argv = malloc(sizeof(char*) * 2);
594
657
if(custom_argv == NULL){
595
perror("malloc");
596
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
597
660
goto fallback;
598
661
}
599
662
custom_argv[0] = argv[0];
615
678
}
616
679
new_arg = strdup(p);
617
680
if(new_arg == NULL){
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
620
683
free(org_line);
621
684
goto fallback;
622
685
}
623
686
624
687
custom_argc += 1;
625
custom_argv = realloc(custom_argv, sizeof(char *)
626
* ((unsigned int) custom_argc + 1));
627
if(custom_argv == NULL){
628
perror("realloc");
629
exitstatus = EXIT_FAILURE;
630
free(org_line);
631
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
632
701
}
633
702
custom_argv[custom_argc-1] = new_arg;
634
703
custom_argv[custom_argc] = NULL;
638
707
ret = fclose(conffp);
639
708
} while(ret == EOF and errno == EINTR);
640
709
if(ret == EOF){
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
643
712
goto fallback;
644
713
}
645
714
free(org_line);
647
716
/* Check for harmful errors and go to fallback. Other errors might
648
717
not affect opening plugins */
649
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
perror("fopen");
651
exitstatus = EXIT_FAILURE;
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
652
721
goto fallback;
653
722
}
654
723
}
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
657
726
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
663
741
goto fallback;
664
742
}
665
743
}
666
744
667
745
/* Parse actual command line arguments, to let them override the
668
746
config file */
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
673
761
goto fallback;
674
762
}
675
763
687
775
}
688
776
}
689
777
690
/* Strip permissions down to nobody */
691
setgid(gid);
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
692
804
if(ret == -1){
693
perror("setgid");
805
error(0, errno, "setgid");
694
806
}
695
807
ret = setuid(uid);
696
808
if(ret == -1){
697
perror("setuid");
698
}
699
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
704
}
705
706
if(dir == NULL){
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
713
813
{
714
int dir_fd = dirfd(dir);
715
if(dir_fd >= 0){
716
ret = set_cloexec_flag(dir_fd);
717
if(ret < 0){
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
720
goto fallback;
721
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
722
844
}
723
845
}
724
846
733
855
/* All directory entries have been processed */
734
856
if(dirst == NULL){
735
857
if(errno == EBADF){
736
perror("readdir");
737
exitstatus = EXIT_FAILURE;
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
738
860
goto fallback;
739
861
}
740
862
break;
741
863
}
742
864
743
d_name_len = strlen(dirst->d_name);
744
745
865
/* Ignore dotfiles, backup files and other junk */
746
866
{
747
867
bool bad_name = false;
748
749
const char const *bad_prefixes[] = { ".", "#", NULL };
750
751
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
752
".dpkg-old",
753
".dpkg-bak",
754
".dpkg-divert", NULL };
755
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
756
size_t pre_len = strlen(*pre);
757
if((d_name_len >= pre_len)
758
and strncmp((dirst->d_name), *pre, pre_len) == 0){
759
if(debug){
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
" with bad prefix %s\n", dirst->d_name, *pre);
762
}
763
bad_name = true;
764
break;
765
}
766
}
767
if(bad_name){
768
continue;
769
}
770
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
size_t suf_len = strlen(*suf);
772
if((d_name_len >= suf_len)
773
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
774
== 0)){
775
if(debug){
776
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
777
" with bad suffix %s\n", dirst->d_name, *suf);
778
}
779
bad_name = true;
780
break;
781
}
782
}
783
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
784
891
if(bad_name){
785
892
continue;
786
893
}
787
894
}
788
895
789
char *filename;
790
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
793
} else {
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
796
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
797
910
if(ret < 0){
798
perror("asprintf");
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
799
913
continue;
800
914
}
801
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
803
917
if(ret == -1){
804
perror("stat");
805
free(filename);
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
806
920
continue;
807
921
}
808
922
809
923
/* Ignore non-executable files */
810
924
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
812
927
if(debug){
813
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
815
931
}
816
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
817
933
continue;
818
934
}
819
935
820
936
plugin *p = getplugin(dirst->d_name);
821
937
if(p == NULL){
822
perror("getplugin");
823
free(filename);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
824
940
continue;
825
941
}
826
942
if(p->disabled){
828
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
829
945
dirst->d_name);
830
946
}
831
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
832
948
continue;
833
949
}
834
950
{
837
953
if(g != NULL){
838
954
for(char **a = g->argv + 1; *a != NULL; a++){
839
955
if(not add_argument(p, *a)){
840
perror("add_argument");
956
error(0, errno, "add_argument");
841
957
}
842
958
}
843
959
/* Add global environment variables */
844
960
for(char **e = g->environ; *e != NULL; e++){
845
961
if(not add_environment(p, *e, false)){
846
perror("add_environment");
962
error(0, errno, "add_environment");
847
963
}
848
964
}
849
965
}
850
966
}
851
/* If this plugin has any environment variables, we will call
852
using execve and need to duplicate the environment from this
853
process, too. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
854
969
if(p->environ[0] != NULL){
855
970
for(char **e = environ; *e != NULL; e++){
856
971
if(not add_environment(p, *e, false)){
857
perror("add_environment");
972
error(0, errno, "add_environment");
858
973
}
859
974
}
860
975
}
861
976
862
977
int pipefd[2];
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
864
979
if(ret == -1){
865
perror("pipe");
866
exitstatus = EXIT_FAILURE;
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
867
982
goto fallback;
868
983
}
869
984
/* Ask OS to automatic close the pipe on exec */
870
985
ret = set_cloexec_flag(pipefd[0]);
871
986
if(ret < 0){
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
987
error(0, errno, "set_cloexec_flag");
988
exitstatus = EX_OSERR;
874
989
goto fallback;
875
990
}
876
991
ret = set_cloexec_flag(pipefd[1]);
877
992
if(ret < 0){
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
993
error(0, errno, "set_cloexec_flag");
994
exitstatus = EX_OSERR;
880
995
goto fallback;
881
996
}
882
997
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
998
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
999
&sigchld_action.sa_mask,
1000
NULL));
886
1001
if(ret < 0){
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "sigprocmask");
1003
exitstatus = EX_OSERR;
889
1004
goto fallback;
890
1005
}
891
1006
/* Starting a new process to be watched */
894
1009
pid = fork();
895
1010
} while(pid == -1 and errno == EINTR);
896
1011
if(pid == -1){
897
perror("fork");
898
exitstatus = EXIT_FAILURE;
1012
error(0, errno, "fork");
1013
exitstatus = EX_OSERR;
899
1014
goto fallback;
900
1015
}
901
1016
if(pid == 0){
902
1017
/* this is the child process */
903
1018
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
904
1019
if(ret < 0){
905
perror("sigaction");
906
_exit(EXIT_FAILURE);
1020
error(0, errno, "sigaction");
1021
_exit(EX_OSERR);
907
1022
}
908
1023
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
1024
if(ret < 0){
910
perror("sigprocmask");
911
_exit(EXIT_FAILURE);
1025
error(0, errno, "sigprocmask");
1026
_exit(EX_OSERR);
912
1027
}
913
1028
914
1029
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
915
1030
if(ret == -1){
916
perror("dup2");
917
_exit(EXIT_FAILURE);
1031
error(0, errno, "dup2");
1032
_exit(EX_OSERR);
918
1033
}
919
1034
920
1035
if(dirfd(dir) < 0){
922
1037
above and must now close it manually here. */
923
1038
closedir(dir);
924
1039
}
925
if(p->environ[0] == NULL){
926
if(execv(filename, p->argv) < 0){
927
perror("execv");
928
_exit(EXIT_FAILURE);
929
}
930
} else {
931
if(execve(filename, p->argv, p->environ) < 0){
932
perror("execve");
933
_exit(EXIT_FAILURE);
934
}
1040
if(fexecve(plugin_fd, p->argv,
1041
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1042
error(0, errno, "fexecve for %s/%s",
1043
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1044
_exit(EX_OSERR);
935
1045
}
936
1046
/* no return */
937
1047
}
938
1048
/* Parent process */
939
1049
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
940
1050
pipe */
941
free(filename);
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
942
1052
plugin *new_plugin = getplugin(dirst->d_name);
943
1053
if(new_plugin == NULL){
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
1054
error(0, errno, "getplugin");
1055
ret = (int)(TEMP_FAILURE_RETRY
1056
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1057
NULL)));
948
1058
if(ret < 0){
949
perror("sigprocmask");
1059
error(0, errno, "sigprocmask");
950
1060
}
951
exitstatus = EXIT_FAILURE;
1061
exitstatus = EX_OSERR;
952
1062
goto fallback;
953
1063
}
954
1064
957
1067
958
1068
/* Unblock SIGCHLD so signal handler can be run if this process
959
1069
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
1070
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1071
&sigchld_action.sa_mask,
1072
NULL));
963
1073
if(ret < 0){
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
1074
error(0, errno, "sigprocmask");
1075
exitstatus = EX_OSERR;
966
1076
goto fallback;
967
1077
}
968
1078
969
FD_SET(new_plugin->fd, &rfds_all);
1079
#if defined (__GNUC__) and defined (__GLIBC__)
1080
#if not __GLIBC_PREREQ(2, 16)
1081
#pragma GCC diagnostic push
1082
#pragma GCC diagnostic ignored "-Wsign-conversion"
1083
#endif
1084
#endif
1085
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1086
-Wconversion in GNU libc
1087
before 2.16 */
1088
#if defined (__GNUC__) and defined (__GLIBC__)
1089
#if not __GLIBC_PREREQ(2, 16)
1090
#pragma GCC diagnostic pop
1091
#endif
1092
#endif
970
1093
971
1094
if(maxfd < new_plugin->fd){
972
1095
maxfd = new_plugin->fd;
993
1116
fd_set rfds = rfds_all;
994
1117
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
1118
if(select_ret == -1 and errno != EINTR){
996
perror("select");
997
exitstatus = EXIT_FAILURE;
1119
error(0, errno, "select");
1120
exitstatus = EX_OSERR;
998
1121
goto fallback;
999
1122
}
1000
1123
/* OK, now either a process completed, or something can be read
1026
1149
}
1027
1150
1028
1151
/* Remove the plugin */
1029
FD_CLR(proc->fd, &rfds_all);
1152
#if defined (__GNUC__) and defined (__GLIBC__)
1153
#if not __GLIBC_PREREQ(2, 16)
1154
#pragma GCC diagnostic push
1155
#pragma GCC diagnostic ignored "-Wsign-conversion"
1156
#endif
1157
#endif
1158
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1159
-Wconversion in GNU libc
1160
before 2.16 */
1161
#if defined (__GNUC__) and defined (__GLIBC__)
1162
#if not __GLIBC_PREREQ(2, 16)
1163
#pragma GCC diagnostic pop
1164
#endif
1165
#endif
1030
1166
1031
1167
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
1035
1172
if(ret < 0){
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1038
1175
goto fallback;
1039
1176
}
1040
1177
1043
1180
proc = next_plugin;
1044
1181
1045
1182
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
1049
1186
if(ret < 0){
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1052
1189
goto fallback;
1053
1190
}
1054
1191
1064
1201
bool bret = print_out_password(proc->buffer,
1065
1202
proc->buffer_length);
1066
1203
if(not bret){
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1069
1206
}
1070
1207
goto fallback;
1071
1208
}
1072
1209
1073
1210
/* This process has not completed. Does it have any output? */
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1211
#if defined (__GNUC__) and defined (__GLIBC__)
1212
#if not __GLIBC_PREREQ(2, 16)
1213
#pragma GCC diagnostic push
1214
#pragma GCC diagnostic ignored "-Wsign-conversion"
1215
#endif
1216
#endif
1217
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
warning from
1219
-Wconversion
1220
in GNU libc
1221
before
1222
2.16 */
1223
#if defined (__GNUC__) and defined (__GLIBC__)
1224
#if not __GLIBC_PREREQ(2, 16)
1225
#pragma GCC diagnostic pop
1226
#endif
1227
#endif
1075
1228
/* This process had nothing to say at this time */
1076
1229
proc = proc->next;
1077
1230
continue;
1078
1231
}
1079
1232
/* Before reading, make the process' data buffer large enough */
1080
1233
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
+ (size_t) BUFFER_SIZE);
1083
if(proc->buffer == NULL){
1084
perror("malloc");
1085
exitstatus = EXIT_FAILURE;
1234
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1235
+ (size_t) BUFFER_SIZE);
1236
if(new_buffer == NULL){
1237
error(0, errno, "malloc");
1238
exitstatus = EX_OSERR;
1086
1239
goto fallback;
1087
1240
}
1241
proc->buffer = new_buffer;
1088
1242
proc->buffer_size += BUFFER_SIZE;
1089
1243
}
1090
1244
/* Read from the process */
1109
1263
1110
1264
fallback:
1111
1265
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1266
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1267
and exitstatus != EX_OK)){
1113
1268
/* Fallback if all plugins failed, none are found or an error
1114
1269
occured */
1115
1270
bool bret;
1123
1278
}
1124
1279
bret = print_out_password(passwordbuffer, len);
1125
1280
if(not bret){
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1281
error(0, errno, "print_out_password");
1282
exitstatus = EX_IOERR;
1128
1283
}
1129
1284
}
1130
1285
1131
1286
/* Restore old signal handler */
1132
1287
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1133
1288
if(ret == -1){
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1289
error(0, errno, "sigaction");
1290
exitstatus = EX_OSERR;
1136
1291
}
1137
1292
1138
1293
if(custom_argv != NULL){
1153
1308
ret = kill(p->pid, SIGTERM);
1154
1309
if(ret == -1 and errno != ESRCH){
1155
1310
/* Set-uid proccesses might not get closed */
1156
perror("kill");
1311
error(0, errno, "kill");
1157
1312
}
1158
1313
}
1159
1314
}
1163
1318
ret = wait(NULL);
1164
1319
} while(ret >= 0);
1165
1320
if(errno != ECHILD){
1166
perror("wait");
1321
error(0, errno, "wait");
1167
1322
}
1168
1323
1169
1324
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0