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- Committer: Teddy Hogeborn
- Date: 2009-10-22 00:05:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20091022000501-g792e99q5g1wkyet
Merge from release branch.
- files removed:
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
O_CLOEXEC */
26
asprintf(), O_CLOEXEC */
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(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
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(),
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
41
WEXITSTATUS(), WTERMSIG(),
42
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
46
readdir(), closedir(), dirfd() */
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
*/
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() */
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
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() */
76
71
77
72
#define BUFFER_SIZE 256
78
73
80
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
76
82
77
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
79
85
80
typedef struct plugin{
86
81
char *name; /* can be NULL or any plugin name */
106
101
107
102
/* Gets an existing plugin based on name,
108
103
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
104
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
112
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
107
if((p->name == name)
114
108
or (p->name and name and (strcmp(p->name, name) == 0))){
129
123
copy_name = strdup(name);
130
124
} while(copy_name == NULL and errno == EINTR);
131
125
if(copy_name == NULL){
132
int e = errno;
133
126
free(new_plugin);
134
errno = e;
135
127
return NULL;
136
128
}
137
129
}
145
137
new_plugin->argv = malloc(sizeof(char *) * 2);
146
138
} while(new_plugin->argv == NULL and errno == EINTR);
147
139
if(new_plugin->argv == NULL){
148
int e = errno;
149
140
free(copy_name);
150
141
free(new_plugin);
151
errno = e;
152
142
return NULL;
153
143
}
154
144
new_plugin->argv[0] = copy_name;
158
148
new_plugin->environ = malloc(sizeof(char *));
159
149
} while(new_plugin->environ == NULL and errno == EINTR);
160
150
if(new_plugin->environ == NULL){
161
int e = errno;
162
151
free(copy_name);
163
152
free(new_plugin->argv);
164
153
free(new_plugin);
165
errno = e;
166
154
return NULL;
167
155
}
168
156
new_plugin->environ[0] = NULL;
173
161
}
174
162
175
163
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
164
static bool add_to_char_array(const char *new, char ***array,
178
165
int *len){
179
166
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
167
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
185
171
/* Malloc check */
186
if(new_array == NULL){
172
if(*array == NULL){
187
173
return false;
188
174
}
189
*array = new_array;
190
175
/* Make a copy of the new string */
191
176
char *copy;
192
177
do {
204
189
}
205
190
206
191
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
192
static bool add_argument(plugin *p, const char *arg){
209
193
if(p == NULL){
210
194
return false;
213
197
}
214
198
215
199
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
200
static bool add_environment(plugin *p, const char *def, bool replace){
218
201
if(p == NULL){
219
202
return false;
221
204
/* namelen = length of name of environment variable */
222
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
206
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
226
209
/* It already exists */
227
210
if(replace){
228
char *new_envdef;
211
char *new;
229
212
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
233
216
return false;
234
217
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
218
*e = new;
219
strcpy(*e, def);
237
220
}
238
221
return true;
239
222
}
246
229
* Descriptor Flags".
247
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
248
231
*/
249
__attribute__((warn_unused_result))
250
232
static int set_cloexec_flag(int fd){
251
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
252
234
/* If reading the flags failed, return error indication now. */
276
258
/* No child processes */
277
259
break;
278
260
}
279
error(0, errno, "waitpid");
261
perror("waitpid");
280
262
}
281
263
282
264
/* A child exited, find it in process_list */
294
276
}
295
277
296
278
/* Prints out a password to stdout */
297
__attribute__((nonnull, warn_unused_result))
298
279
static bool print_out_password(const char *buffer, size_t length){
299
280
ssize_t ret;
300
281
for(size_t written = 0; written < length; written += (size_t)ret){
308
289
}
309
290
310
291
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
312
292
static void free_plugin(plugin *plugin_node){
313
293
314
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
348
328
char *plugindir = NULL;
349
329
char *argfile = NULL;
350
330
FILE *conffp;
331
size_t d_name_len;
351
332
DIR *dir = NULL;
352
333
struct dirent *dirst;
353
334
struct stat st;
363
344
.sa_flags = SA_NOCLDSTOP };
364
345
char **custom_argv = NULL;
365
346
int custom_argc = 0;
366
int dir_fd;
367
347
368
348
/* Establish a signal handler */
369
349
sigemptyset(&sigchld_action.sa_mask);
370
350
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
351
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
352
perror("sigaddset");
353
exitstatus = EXIT_FAILURE;
374
354
goto fallback;
375
355
}
376
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
357
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
358
perror("sigaction");
359
exitstatus = EXIT_FAILURE;
380
360
goto fallback;
381
361
}
382
362
414
394
.doc = "Group ID the plugins will run as", .group = 3 },
415
395
{ .name = "debug", .key = 132,
416
396
.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 },
426
397
{ .name = NULL }
427
398
};
428
399
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
432
402
switch(key){
433
403
char *tmp;
434
intmax_t tmp_id;
404
intmax_t tmpmax;
435
405
case 'g': /* --global-options */
436
{
406
if(arg != NULL){
437
407
char *plugin_option;
438
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
410
continue;
411
}
439
412
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
441
415
}
442
416
}
443
errno = 0;
444
417
}
445
418
break;
446
419
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
420
if(arg == NULL){
421
break;
422
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
449
425
}
450
426
break;
451
427
case 'o': /* --options-for */
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;
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
470
438
}
471
439
}
472
errno = 0;
473
440
}
474
441
break;
475
442
case 'E': /* --env-for */
443
if(arg == NULL){
444
break;
445
}
476
446
{
477
447
char *envdef = strchr(arg, ':');
478
448
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
449
break;
482
450
}
483
451
*envdef = '\0';
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;
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
492
454
}
493
455
}
494
456
break;
495
457
case 'd': /* --disable */
496
{
458
if(arg != NULL){
497
459
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
501
462
}
463
p->disabled = true;
502
464
}
503
465
break;
504
466
case 'e': /* --enable */
505
{
467
if(arg != NULL){
506
468
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
510
471
}
472
p->disabled = false;
511
473
}
512
474
break;
513
475
case 128: /* --plugin-dir */
514
476
free(plugindir);
515
477
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
478
if(plugindir == NULL){
479
perror("strdup");
518
480
}
519
481
break;
520
482
case 129: /* --config-file */
521
483
/* This is already done by parse_opt_config_file() */
522
484
break;
523
485
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
525
488
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
530
494
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
495
break;
534
496
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
536
499
if(errno != 0 or tmp == arg or *tmp != '\0'
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;
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
541
505
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
506
break;
545
507
case 132: /* --debug */
546
508
debug = true;
547
509
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;
562
510
/*
563
511
* When adding more options before this line, remember to also add a
564
512
* "case" to the "parse_opt_config_file" function below.
567
515
/* Cryptsetup always passes an argument, which is an empty
568
516
string if "none" was specified in /etc/crypttab. So if
569
517
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
572
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
573
524
default:
574
525
return ARGP_ERR_UNKNOWN;
575
526
}
576
return errno; /* Set to 0 at start */
527
return 0;
577
528
}
578
529
579
530
/* This option parser is the same as parse_opt() above, except it
581
532
error_t parse_opt_config_file(int key, char *arg,
582
533
__attribute__((unused))
583
534
struct argp_state *state){
584
errno = 0;
585
535
switch(key){
586
536
case 'g': /* --global-options */
587
537
case 'G': /* --global-env */
594
544
case 129: /* --config-file */
595
545
free(argfile);
596
546
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
547
if(argfile == NULL){
548
perror("strdup");
599
549
}
600
550
break;
601
551
case 130: /* --userid */
602
552
case 131: /* --groupid */
603
553
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
554
case ARGP_KEY_ARG:
555
case ARGP_KEY_END:
608
556
break;
609
557
default:
610
558
return ARGP_ERR_UNKNOWN;
611
559
}
612
return errno;
560
return 0;
613
561
}
614
562
615
563
struct argp argp = { .options = options,
619
567
620
568
/* Parse using parse_opt_config_file() in order to get the custom
621
569
config file location, if any. */
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;
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
636
574
goto fallback;
637
575
}
638
576
655
593
custom_argc = 1;
656
594
custom_argv = malloc(sizeof(char*) * 2);
657
595
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
596
perror("malloc");
597
exitstatus = EXIT_FAILURE;
660
598
goto fallback;
661
599
}
662
600
custom_argv[0] = argv[0];
678
616
}
679
617
new_arg = strdup(p);
680
618
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
619
perror("strdup");
620
exitstatus = EXIT_FAILURE;
683
621
free(org_line);
684
622
goto fallback;
685
623
}
686
624
687
625
custom_argc += 1;
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
}
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
629
perror("realloc");
630
exitstatus = EXIT_FAILURE;
631
free(org_line);
632
goto fallback;
701
633
}
702
634
custom_argv[custom_argc-1] = new_arg;
703
635
custom_argv[custom_argc] = NULL;
707
639
ret = fclose(conffp);
708
640
} while(ret == EOF and errno == EINTR);
709
641
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
712
644
goto fallback;
713
645
}
714
646
free(org_line);
716
648
/* Check for harmful errors and go to fallback. Other errors might
717
649
not affect opening plugins */
718
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
651
perror("fopen");
652
exitstatus = EXIT_FAILURE;
721
653
goto fallback;
722
654
}
723
655
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
726
658
if(custom_argv != NULL){
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;
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
741
664
goto fallback;
742
665
}
743
666
}
744
667
745
668
/* Parse actual command line arguments, to let them override the
746
669
config file */
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;
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
761
674
goto fallback;
762
675
}
763
676
775
688
}
776
689
}
777
690
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);
691
/* Strip permissions down to nobody */
692
setgid(gid);
804
693
if(ret == -1){
805
error(0, errno, "setgid");
694
perror("setgid");
806
695
}
807
696
ret = setuid(uid);
808
697
if(ret == -1){
809
error(0, errno, "setuid");
698
perror("setuid");
810
699
}
811
700
812
701
/* Open plugin directory with close_on_exec flag */
813
702
{
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
);
703
int dir_fd = -1;
704
if(plugindir == NULL){
705
dir_fd = open(PDIR, O_RDONLY |
706
#ifdef O_CLOEXEC
707
O_CLOEXEC
708
#else /* not O_CLOEXEC */
709
0
710
#endif /* not O_CLOEXEC */
711
);
712
} else {
713
dir_fd = open(plugindir, O_RDONLY |
714
#ifdef O_CLOEXEC
715
O_CLOEXEC
716
#else /* not O_CLOEXEC */
717
0
718
#endif /* not O_CLOEXEC */
719
);
720
}
821
721
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
722
perror("Could not open plugin dir");
723
exitstatus = EXIT_FAILURE;
824
724
goto fallback;
825
725
}
826
726
828
728
/* Set the FD_CLOEXEC flag on the directory */
829
729
ret = set_cloexec_flag(dir_fd);
830
730
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
731
perror("set_cloexec_flag");
832
732
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
733
exitstatus = EXIT_FAILURE;
834
734
goto fallback;
835
735
}
836
736
#endif /* O_CLOEXEC */
837
737
838
738
dir = fdopendir(dir_fd);
839
739
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
740
perror("Could not open plugin dir");
841
741
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
742
exitstatus = EXIT_FAILURE;
843
743
goto fallback;
844
744
}
845
745
}
855
755
/* All directory entries have been processed */
856
756
if(dirst == NULL){
857
757
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
758
perror("readdir");
759
exitstatus = EXIT_FAILURE;
860
760
goto fallback;
861
761
}
862
762
break;
863
763
}
864
764
765
d_name_len = strlen(dirst->d_name);
766
865
767
/* Ignore dotfiles, backup files and other junk */
866
768
{
867
769
bool bad_name = false;
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
}
770
771
const char const *bad_prefixes[] = { ".", "#", NULL };
772
773
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
774
".dpkg-old",
775
".dpkg-bak",
776
".dpkg-divert", NULL };
777
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
778
size_t pre_len = strlen(*pre);
779
if((d_name_len >= pre_len)
780
and strncmp((dirst->d_name), *pre, pre_len) == 0){
781
if(debug){
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" with bad prefix %s\n", dirst->d_name, *pre);
784
}
785
bad_name = true;
786
break;
787
}
788
}
789
if(bad_name){
790
continue;
791
}
792
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
793
size_t suf_len = strlen(*suf);
794
if((d_name_len >= suf_len)
795
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
796
== 0)){
797
if(debug){
798
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
799
" with bad suffix %s\n", dirst->d_name, *suf);
800
}
801
bad_name = true;
802
break;
803
}
804
}
805
891
806
if(bad_name){
892
807
continue;
893
808
}
894
809
}
895
810
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;
811
char *filename;
812
if(plugindir == NULL){
813
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
814
dirst->d_name));
815
} else {
816
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
817
plugindir,
818
dirst->d_name));
906
819
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
910
820
if(ret < 0){
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
821
perror("asprintf");
913
822
continue;
914
823
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
824
825
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
917
826
if(ret == -1){
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
827
perror("stat");
828
free(filename);
920
829
continue;
921
830
}
922
831
923
832
/* Ignore non-executable files */
924
833
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
834
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
927
835
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
836
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
" with bad type or mode\n", filename);
931
838
}
932
TEMP_FAILURE_RETRY(close(plugin_fd));
839
free(filename);
933
840
continue;
934
841
}
935
842
936
843
plugin *p = getplugin(dirst->d_name);
937
844
if(p == NULL){
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
845
perror("getplugin");
846
free(filename);
940
847
continue;
941
848
}
942
849
if(p->disabled){
944
851
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
945
852
dirst->d_name);
946
853
}
947
TEMP_FAILURE_RETRY(close(plugin_fd));
854
free(filename);
948
855
continue;
949
856
}
950
857
{
953
860
if(g != NULL){
954
861
for(char **a = g->argv + 1; *a != NULL; a++){
955
862
if(not add_argument(p, *a)){
956
error(0, errno, "add_argument");
863
perror("add_argument");
957
864
}
958
865
}
959
866
/* Add global environment variables */
960
867
for(char **e = g->environ; *e != NULL; e++){
961
868
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
869
perror("add_environment");
963
870
}
964
871
}
965
872
}
966
873
}
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
874
/* If this plugin has any environment variables, we will call
875
using execve and need to duplicate the environment from this
876
process, too. */
969
877
if(p->environ[0] != NULL){
970
878
for(char **e = environ; *e != NULL; e++){
971
879
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
880
perror("add_environment");
973
881
}
974
882
}
975
883
}
977
885
int pipefd[2];
978
886
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
979
887
if(ret == -1){
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
888
perror("pipe");
889
exitstatus = EXIT_FAILURE;
982
890
goto fallback;
983
891
}
984
892
/* Ask OS to automatic close the pipe on exec */
985
893
ret = set_cloexec_flag(pipefd[0]);
986
894
if(ret < 0){
987
error(0, errno, "set_cloexec_flag");
988
exitstatus = EX_OSERR;
895
perror("set_cloexec_flag");
896
exitstatus = EXIT_FAILURE;
989
897
goto fallback;
990
898
}
991
899
ret = set_cloexec_flag(pipefd[1]);
992
900
if(ret < 0){
993
error(0, errno, "set_cloexec_flag");
994
exitstatus = EX_OSERR;
901
perror("set_cloexec_flag");
902
exitstatus = EXIT_FAILURE;
995
903
goto fallback;
996
904
}
997
905
/* Block SIGCHLD until process is safely in process list */
999
907
&sigchld_action.sa_mask,
1000
908
NULL));
1001
909
if(ret < 0){
1002
error(0, errno, "sigprocmask");
1003
exitstatus = EX_OSERR;
910
perror("sigprocmask");
911
exitstatus = EXIT_FAILURE;
1004
912
goto fallback;
1005
913
}
1006
914
/* Starting a new process to be watched */
1009
917
pid = fork();
1010
918
} while(pid == -1 and errno == EINTR);
1011
919
if(pid == -1){
1012
error(0, errno, "fork");
1013
exitstatus = EX_OSERR;
920
perror("fork");
921
exitstatus = EXIT_FAILURE;
1014
922
goto fallback;
1015
923
}
1016
924
if(pid == 0){
1017
925
/* this is the child process */
1018
926
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1019
927
if(ret < 0){
1020
error(0, errno, "sigaction");
1021
_exit(EX_OSERR);
928
perror("sigaction");
929
_exit(EXIT_FAILURE);
1022
930
}
1023
931
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1024
932
if(ret < 0){
1025
error(0, errno, "sigprocmask");
1026
_exit(EX_OSERR);
933
perror("sigprocmask");
934
_exit(EXIT_FAILURE);
1027
935
}
1028
936
1029
937
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1030
938
if(ret == -1){
1031
error(0, errno, "dup2");
1032
_exit(EX_OSERR);
939
perror("dup2");
940
_exit(EXIT_FAILURE);
1033
941
}
1034
942
1035
943
if(dirfd(dir) < 0){
1037
945
above and must now close it manually here. */
1038
946
closedir(dir);
1039
947
}
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);
948
if(p->environ[0] == NULL){
949
if(execv(filename, p->argv) < 0){
950
perror("execv");
951
_exit(EXIT_FAILURE);
952
}
953
} else {
954
if(execve(filename, p->argv, p->environ) < 0){
955
perror("execve");
956
_exit(EXIT_FAILURE);
957
}
1045
958
}
1046
959
/* no return */
1047
960
}
1048
961
/* Parent process */
1049
962
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1050
963
pipe */
1051
TEMP_FAILURE_RETRY(close(plugin_fd));
964
free(filename);
1052
965
plugin *new_plugin = getplugin(dirst->d_name);
1053
966
if(new_plugin == NULL){
1054
error(0, errno, "getplugin");
967
perror("getplugin");
1055
968
ret = (int)(TEMP_FAILURE_RETRY
1056
969
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1057
970
NULL)));
1058
971
if(ret < 0){
1059
error(0, errno, "sigprocmask");
972
perror("sigprocmask");
1060
973
}
1061
exitstatus = EX_OSERR;
974
exitstatus = EXIT_FAILURE;
1062
975
goto fallback;
1063
976
}
1064
977
1071
984
&sigchld_action.sa_mask,
1072
985
NULL));
1073
986
if(ret < 0){
1074
error(0, errno, "sigprocmask");
1075
exitstatus = EX_OSERR;
987
perror("sigprocmask");
988
exitstatus = EXIT_FAILURE;
1076
989
goto fallback;
1077
990
}
1078
991
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
992
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
993
-Wconversion */
1093
994
1094
995
if(maxfd < new_plugin->fd){
1095
996
maxfd = new_plugin->fd;
1116
1017
fd_set rfds = rfds_all;
1117
1018
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1118
1019
if(select_ret == -1 and errno != EINTR){
1119
error(0, errno, "select");
1120
exitstatus = EX_OSERR;
1020
perror("select");
1021
exitstatus = EXIT_FAILURE;
1121
1022
goto fallback;
1122
1023
}
1123
1024
/* OK, now either a process completed, or something can be read
1149
1050
}
1150
1051
1151
1052
/* Remove the plugin */
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
1053
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
1054
-Wconversion */
1166
1055
1167
1056
/* Block signal while modifying process_list */
1168
1057
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1170
1059
&sigchld_action.sa_mask,
1171
1060
NULL));
1172
1061
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
1062
perror("sigprocmask");
1063
exitstatus = EXIT_FAILURE;
1175
1064
goto fallback;
1176
1065
}
1177
1066
1184
1073
(sigprocmask(SIG_UNBLOCK,
1185
1074
&sigchld_action.sa_mask, NULL)));
1186
1075
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1076
perror("sigprocmask");
1077
exitstatus = EXIT_FAILURE;
1189
1078
goto fallback;
1190
1079
}
1191
1080
1201
1090
bool bret = print_out_password(proc->buffer,
1202
1091
proc->buffer_length);
1203
1092
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1093
perror("print_out_password");
1094
exitstatus = EXIT_FAILURE;
1206
1095
}
1207
1096
goto fallback;
1208
1097
}
1209
1098
1210
1099
/* This process has not completed. Does it have any output? */
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
1100
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1218
1101
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
1102
-Wconversion */
1228
1103
/* This process had nothing to say at this time */
1229
1104
proc = proc->next;
1230
1105
continue;
1231
1106
}
1232
1107
/* Before reading, make the process' data buffer large enough */
1233
1108
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
1109
proc->buffer = realloc(proc->buffer, proc->buffer_size
1110
+ (size_t) BUFFER_SIZE);
1111
if(proc->buffer == NULL){
1112
perror("malloc");
1113
exitstatus = EXIT_FAILURE;
1239
1114
goto fallback;
1240
1115
}
1241
proc->buffer = new_buffer;
1242
1116
proc->buffer_size += BUFFER_SIZE;
1243
1117
}
1244
1118
/* Read from the process */
1263
1137
1264
1138
fallback:
1265
1139
1266
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1267
and exitstatus != EX_OK)){
1140
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1268
1141
/* Fallback if all plugins failed, none are found or an error
1269
1142
occured */
1270
1143
bool bret;
1278
1151
}
1279
1152
bret = print_out_password(passwordbuffer, len);
1280
1153
if(not bret){
1281
error(0, errno, "print_out_password");
1282
exitstatus = EX_IOERR;
1154
perror("print_out_password");
1155
exitstatus = EXIT_FAILURE;
1283
1156
}
1284
1157
}
1285
1158
1286
1159
/* Restore old signal handler */
1287
1160
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1288
1161
if(ret == -1){
1289
error(0, errno, "sigaction");
1290
exitstatus = EX_OSERR;
1162
perror("sigaction");
1163
exitstatus = EXIT_FAILURE;
1291
1164
}
1292
1165
1293
1166
if(custom_argv != NULL){
1308
1181
ret = kill(p->pid, SIGTERM);
1309
1182
if(ret == -1 and errno != ESRCH){
1310
1183
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1184
perror("kill");
1312
1185
}
1313
1186
}
1314
1187
}
1318
1191
ret = wait(NULL);
1319
1192
} while(ret >= 0);
1320
1193
if(errno != ECHILD){
1321
error(0, errno, "wait");
1194
perror("wait");
1322
1195
}
1323
1196
1324
1197
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0