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- Committer: Teddy Hogeborn
- Date: 2014-03-23 19:55:18 UTC
- Revision ID: teddy@recompile.se-20140323195518-amvoytwi12iheypo
Make mandos-client prefer /run/tmp over /tmp.
* plugins.d/mandos-client.c (init_gpgme): Add more const.
(main): Make "tempdir" a pointer to the temporary directory, if one
has been created, or NULL. This also eliminates the need
for the "tempdir_created" variable.
* plugins.d/mandos-client.c (init_gpgme): Add more const.
(main): Make "tempdir" a pointer to the temporary directory, if one
has been created, or NULL. This also eliminates the need
for the "tempdir_created" variable.
- files added:
- DBUS-API
- debian/source
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
42
42
WCOREDUMP() */
43
43
#include <sys/stat.h> /* struct stat, stat(), 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
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
54
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
55
FD_CLOEXEC */
56
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
strsignal(), 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() */
71
75
72
76
#define BUFFER_SIZE 256
73
77
75
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
80
77
81
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
79
83
80
84
typedef struct plugin{
81
85
char *name; /* can be NULL or any plugin name */
101
105
102
106
/* Gets an existing plugin based on name,
103
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
104
109
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
110
/* Check for existing plugin with that name */
106
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
112
if((p->name == name)
108
113
or (p->name and name and (strcmp(p->name, name) == 0))){
110
115
}
111
116
}
112
117
/* Create a new plugin */
113
plugin *new_plugin = malloc(sizeof(plugin));
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
114
122
if(new_plugin == NULL){
115
123
return NULL;
116
124
}
117
125
char *copy_name = NULL;
118
126
if(name != NULL){
119
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
120
130
if(copy_name == NULL){
131
int e = errno;
121
132
free(new_plugin);
133
errno = e;
122
134
return NULL;
123
135
}
124
136
}
128
140
.disabled = false,
129
141
.next = plugin_list };
130
142
131
new_plugin->argv = malloc(sizeof(char *) * 2);
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
132
146
if(new_plugin->argv == NULL){
147
int e = errno;
133
148
free(copy_name);
134
149
free(new_plugin);
150
errno = e;
135
151
return NULL;
136
152
}
137
153
new_plugin->argv[0] = copy_name;
138
154
new_plugin->argv[1] = NULL;
139
155
140
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
141
159
if(new_plugin->environ == NULL){
160
int e = errno;
142
161
free(copy_name);
143
162
free(new_plugin->argv);
144
163
free(new_plugin);
164
errno = e;
145
165
return NULL;
146
166
}
147
167
new_plugin->environ[0] = NULL;
152
172
}
153
173
154
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
155
176
static bool add_to_char_array(const char *new, char ***array,
156
177
int *len){
157
178
/* Resize the pointed-to array to hold one more pointer */
158
*array = realloc(*array, sizeof(char *)
159
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
160
184
/* Malloc check */
161
if(*array == NULL){
185
if(new_array == NULL){
162
186
return false;
163
187
}
188
*array = new_array;
164
189
/* Make a copy of the new string */
165
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
166
194
if(copy == NULL){
167
195
return false;
168
196
}
175
203
}
176
204
177
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
178
207
static bool add_argument(plugin *p, const char *arg){
179
208
if(p == NULL){
180
209
return false;
183
212
}
184
213
185
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
186
216
static bool add_environment(plugin *p, const char *def, bool replace){
187
217
if(p == NULL){
188
218
return false;
190
220
/* namelen = length of name of environment variable */
191
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
192
222
/* Search for this environment variable */
193
for(char **e = p->environ; *e != NULL; e++){
194
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
195
225
/* It already exists */
196
226
if(replace){
197
char *new = realloc(*e, strlen(def) + 1);
198
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
199
232
return false;
200
233
}
201
*e = new;
202
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
203
236
}
204
237
return true;
205
238
}
212
245
* Descriptor Flags".
213
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
214
247
*/
248
__attribute__((warn_unused_result))
215
249
static int set_cloexec_flag(int fd){
216
int ret = fcntl(fd, F_GETFD, 0);
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
217
251
/* If reading the flags failed, return error indication now. */
218
252
if(ret < 0){
219
253
return ret;
220
254
}
221
255
/* Store modified flag word in the descriptor. */
222
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
223
258
}
224
259
225
260
240
275
/* No child processes */
241
276
break;
242
277
}
243
perror("waitpid");
278
error(0, errno, "waitpid");
244
279
}
245
280
246
281
/* A child exited, find it in process_list */
258
293
}
259
294
260
295
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
261
297
static bool print_out_password(const char *buffer, size_t length){
262
298
ssize_t ret;
263
299
for(size_t written = 0; written < length; written += (size_t)ret){
271
307
}
272
308
273
309
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
274
311
static void free_plugin(plugin *plugin_node){
275
312
276
313
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
331
368
sigemptyset(&sigchld_action.sa_mask);
332
369
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
333
370
if(ret == -1){
334
perror("sigaddset");
335
exitstatus = EXIT_FAILURE;
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
336
373
goto fallback;
337
374
}
338
375
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
339
376
if(ret == -1){
340
perror("sigaction");
341
exitstatus = EXIT_FAILURE;
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
342
379
goto fallback;
343
380
}
344
381
376
413
.doc = "Group ID the plugins will run as", .group = 3 },
377
414
{ .name = "debug", .key = 132,
378
415
.doc = "Debug mode", .group = 4 },
416
/*
417
* These reproduce what we would get without ARGP_NO_HELP
418
*/
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
379
425
{ .name = NULL }
380
426
};
381
427
382
error_t parse_opt(int key, char *arg, __attribute__((unused))
383
struct argp_state *state){
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
errno = 0;
384
431
switch(key){
385
432
char *tmp;
386
intmax_t tmpmax;
433
intmax_t tmp_id;
387
434
case 'g': /* --global-options */
388
if(arg != NULL){
435
{
389
436
char *plugin_option;
390
437
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
392
continue;
393
}
394
438
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
439
break;
397
440
}
398
441
}
442
errno = 0;
399
443
}
400
444
break;
401
445
case 'G': /* --global-env */
402
if(arg == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
446
if(add_environment(getplugin(NULL), arg, true)){
447
errno = 0;
407
448
}
408
449
break;
409
450
case 'o': /* --options-for */
410
if(arg != NULL){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
413
break;
414
}
415
char *plugin_option;
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
451
{
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
455
errno = EINVAL;
456
break;
457
}
458
*option_list = '\0';
459
option_list++;
460
if(arg[0] == '\0'){
461
argp_error(state, "Empty plugin name");
462
errno = EINVAL;
463
break;
464
}
465
char *option;
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
468
break;
420
469
}
421
470
}
471
errno = 0;
422
472
}
423
473
break;
424
474
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
475
{
429
476
char *envdef = strchr(arg, ':');
430
477
if(envdef == NULL){
478
argp_error(state, "No colon in \"%s\"", arg);
479
errno = EINVAL;
431
480
break;
432
481
}
433
482
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
483
envdef++;
484
if(arg[0] == '\0'){
485
argp_error(state, "Empty plugin name");
486
errno = EINVAL;
487
break;
488
}
489
if(add_environment(getplugin(arg), envdef, true)){
490
errno = 0;
436
491
}
437
492
}
438
493
break;
439
494
case 'd': /* --disable */
440
if(arg != NULL){
495
{
441
496
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
497
if(p != NULL){
498
p->disabled = true;
499
errno = 0;
444
500
}
445
p->disabled = true;
446
501
}
447
502
break;
448
503
case 'e': /* --enable */
449
if(arg != NULL){
504
{
450
505
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
506
if(p != NULL){
507
p->disabled = false;
508
errno = 0;
453
509
}
454
p->disabled = false;
455
510
}
456
511
break;
457
512
case 128: /* --plugin-dir */
458
513
free(plugindir);
459
514
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
515
if(plugindir != NULL){
516
errno = 0;
462
517
}
463
518
break;
464
519
case 129: /* --config-file */
465
520
/* This is already done by parse_opt_config_file() */
466
521
break;
467
522
case 130: /* --userid */
468
errno = 0;
469
tmpmax = strtoimax(arg, &tmp, 10);
523
tmp_id = strtoimax(arg, &tmp, 10);
470
524
if(errno != 0 or tmp == arg or *tmp != '\0'
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
528
break;
476
529
}
530
uid = (uid_t)tmp_id;
531
errno = 0;
477
532
break;
478
533
case 131: /* --groupid */
479
errno = 0;
480
tmpmax = strtoimax(arg, &tmp, 10);
534
tmp_id = strtoimax(arg, &tmp, 10);
481
535
if(errno != 0 or tmp == arg or *tmp != '\0'
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
485
} else {
486
gid = (gid_t)tmpmax;
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
539
break;
487
540
}
541
gid = (gid_t)tmp_id;
542
errno = 0;
488
543
break;
489
544
case 132: /* --debug */
490
545
debug = true;
491
546
break;
547
/*
548
* These reproduce what we would get without ARGP_NO_HELP
549
*/
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
559
exit(EXIT_SUCCESS);
560
break;
492
561
/*
493
562
* When adding more options before this line, remember to also add a
494
563
* "case" to the "parse_opt_config_file" function below.
497
566
/* Cryptsetup always passes an argument, which is an empty
498
567
string if "none" was specified in /etc/crypttab. So if
499
568
argument was empty, we ignore it silently. */
500
if(arg[0] != '\0'){
501
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
569
if(arg[0] == '\0'){
570
break;
502
571
}
503
break;
504
case ARGP_KEY_END:
505
break;
506
572
default:
507
573
return ARGP_ERR_UNKNOWN;
508
574
}
509
return 0;
575
return errno; /* Set to 0 at start */
510
576
}
511
577
512
578
/* This option parser is the same as parse_opt() above, except it
514
580
error_t parse_opt_config_file(int key, char *arg,
515
581
__attribute__((unused))
516
582
struct argp_state *state){
583
errno = 0;
517
584
switch(key){
518
585
case 'g': /* --global-options */
519
586
case 'G': /* --global-env */
526
593
case 129: /* --config-file */
527
594
free(argfile);
528
595
argfile = strdup(arg);
529
if(argfile == NULL){
530
perror("strdup");
596
if(argfile != NULL){
597
errno = 0;
531
598
}
532
599
break;
533
600
case 130: /* --userid */
534
601
case 131: /* --groupid */
535
602
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
536
606
case ARGP_KEY_ARG:
537
case ARGP_KEY_END:
538
607
break;
539
608
default:
540
609
return ARGP_ERR_UNKNOWN;
541
610
}
542
return 0;
611
return errno;
543
612
}
544
613
545
614
struct argp argp = { .options = options,
549
618
550
619
/* Parse using parse_opt_config_file() in order to get the custom
551
620
config file location, if any. */
552
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
553
if(ret == ARGP_ERR_UNKNOWN){
554
fprintf(stderr, "Unknown error while parsing arguments\n");
555
exitstatus = EXIT_FAILURE;
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
623
NULL, NULL);
624
switch(ret){
625
case 0:
626
break;
627
case ENOMEM:
628
default:
629
errno = ret;
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
632
goto fallback;
633
case EINVAL:
634
exitstatus = EX_USAGE;
556
635
goto fallback;
557
636
}
558
637
575
654
custom_argc = 1;
576
655
custom_argv = malloc(sizeof(char*) * 2);
577
656
if(custom_argv == NULL){
578
perror("malloc");
579
exitstatus = EXIT_FAILURE;
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
580
659
goto fallback;
581
660
}
582
661
custom_argv[0] = argv[0];
598
677
}
599
678
new_arg = strdup(p);
600
679
if(new_arg == NULL){
601
perror("strdup");
602
exitstatus = EXIT_FAILURE;
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
603
682
free(org_line);
604
683
goto fallback;
605
684
}
606
685
607
686
custom_argc += 1;
608
custom_argv = realloc(custom_argv, sizeof(char *)
609
* ((unsigned int) custom_argc + 1));
610
if(custom_argv == NULL){
611
perror("realloc");
612
exitstatus = EXIT_FAILURE;
613
free(org_line);
614
goto fallback;
687
{
688
char **new_argv = realloc(custom_argv, sizeof(char *)
689
* ((unsigned int)
690
custom_argc + 1));
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
694
free(new_arg);
695
free(org_line);
696
goto fallback;
697
} else {
698
custom_argv = new_argv;
699
}
615
700
}
616
701
custom_argv[custom_argc-1] = new_arg;
617
702
custom_argv[custom_argc] = NULL;
618
703
}
619
704
}
620
do{
705
do {
621
706
ret = fclose(conffp);
622
}while(ret == EOF and errno == EINTR);
707
} while(ret == EOF and errno == EINTR);
623
708
if(ret == EOF){
624
perror("fclose");
625
exitstatus = EXIT_FAILURE;
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
626
711
goto fallback;
627
712
}
628
713
free(org_line);
630
715
/* Check for harmful errors and go to fallback. Other errors might
631
716
not affect opening plugins */
632
717
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
633
perror("fopen");
634
exitstatus = EXIT_FAILURE;
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
635
720
goto fallback;
636
721
}
637
722
}
638
/* If there was any arguments from configuration file,
639
pass them to parser as command arguments */
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
640
725
if(custom_argv != NULL){
641
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
642
0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
728
NULL, NULL);
729
switch(ret){
730
case 0:
731
break;
732
case ENOMEM:
733
default:
734
errno = ret;
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
737
goto fallback;
738
case EINVAL:
739
exitstatus = EX_CONFIG;
646
740
goto fallback;
647
741
}
648
742
}
649
743
650
744
/* Parse actual command line arguments, to let them override the
651
745
config file */
652
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
653
if(ret == ARGP_ERR_UNKNOWN){
654
fprintf(stderr, "Unknown error while parsing arguments\n");
655
exitstatus = EXIT_FAILURE;
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
NULL, NULL);
749
switch(ret){
750
case 0:
751
break;
752
case ENOMEM:
753
default:
754
errno = ret;
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
757
goto fallback;
758
case EINVAL:
759
exitstatus = EX_USAGE;
656
760
goto fallback;
657
761
}
658
762
670
774
}
671
775
}
672
776
673
/* Strip permissions down to nobody */
674
setgid(gid);
777
if(getuid() == 0){
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open");
783
} else {
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
785
if(ret == -1){
786
error(0, errno, "fstat");
787
} else {
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
790
if(ret == -1){
791
error(0, errno, "fchown");
792
}
793
}
794
}
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
796
}
797
}
798
799
/* Lower permissions */
800
ret = setgid(gid);
675
801
if(ret == -1){
676
perror("setgid");
802
error(0, errno, "setgid");
677
803
}
678
804
ret = setuid(uid);
679
805
if(ret == -1){
680
perror("setuid");
681
}
682
683
if(plugindir == NULL){
684
dir = opendir(PDIR);
685
} else {
686
dir = opendir(plugindir);
687
}
688
689
if(dir == NULL){
690
perror("Could not open plugin dir");
691
exitstatus = EXIT_FAILURE;
692
goto fallback;
693
}
694
695
/* Set the FD_CLOEXEC flag on the directory, if possible */
806
error(0, errno, "setuid");
807
}
808
809
/* Open plugin directory with close_on_exec flag */
696
810
{
697
int dir_fd = dirfd(dir);
698
if(dir_fd >= 0){
699
ret = set_cloexec_flag(dir_fd);
700
if(ret < 0){
701
perror("set_cloexec_flag");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
811
int dir_fd = -1;
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
814
#ifdef O_CLOEXEC
815
O_CLOEXEC
816
#else /* not O_CLOEXEC */
817
0
818
#endif /* not O_CLOEXEC */
819
);
820
} else {
821
dir_fd = open(plugindir, O_RDONLY |
822
#ifdef O_CLOEXEC
823
O_CLOEXEC
824
#else /* not O_CLOEXEC */
825
0
826
#endif /* not O_CLOEXEC */
827
);
828
}
829
if(dir_fd == -1){
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
832
goto fallback;
833
}
834
835
#ifndef O_CLOEXEC
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
838
if(ret < 0){
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
842
goto fallback;
843
}
844
#endif /* O_CLOEXEC */
845
846
dir = fdopendir(dir_fd);
847
if(dir == NULL){
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
851
goto fallback;
705
852
}
706
853
}
707
854
709
856
710
857
/* Read and execute any executable in the plugin directory*/
711
858
while(true){
712
dirst = readdir(dir);
859
do {
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
713
862
714
863
/* All directory entries have been processed */
715
864
if(dirst == NULL){
716
865
if(errno == EBADF){
717
perror("readdir");
718
exitstatus = EXIT_FAILURE;
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
719
868
goto fallback;
720
869
}
721
870
break;
727
876
{
728
877
bool bad_name = false;
729
878
730
const char const *bad_prefixes[] = { ".", "#", NULL };
879
const char * const bad_prefixes[] = { ".", "#", NULL };
731
880
732
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
733
882
".dpkg-old",
734
883
".dpkg-bak",
735
884
".dpkg-divert", NULL };
736
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
885
#ifdef __GNUC__
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
888
#endif
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
891
#ifdef __GNUC__
892
#pragma GCC diagnostic pop
893
#endif
737
894
size_t pre_len = strlen(*pre);
738
895
if((d_name_len >= pre_len)
739
896
and strncmp((dirst->d_name), *pre, pre_len) == 0){
748
905
if(bad_name){
749
906
continue;
750
907
}
751
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
908
#ifdef __GNUC__
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
911
#endif
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
914
#ifdef __GNUC__
915
#pragma GCC diagnostic pop
916
#endif
752
917
size_t suf_len = strlen(*suf);
753
918
if((d_name_len >= suf_len)
754
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
755
920
== 0)){
756
921
if(debug){
757
922
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
769
934
770
935
char *filename;
771
936
if(plugindir == NULL){
772
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
938
dirst->d_name));
773
939
} else {
774
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
941
plugindir,
942
dirst->d_name));
775
943
}
776
944
if(ret < 0){
777
perror("asprintf");
945
error(0, errno, "asprintf");
778
946
continue;
779
947
}
780
948
781
ret = stat(filename, &st);
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
782
950
if(ret == -1){
783
perror("stat");
951
error(0, errno, "stat");
784
952
free(filename);
785
953
continue;
786
954
}
787
955
788
956
/* Ignore non-executable files */
789
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
957
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
790
959
if(debug){
791
960
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
792
961
" with bad type or mode\n", filename);
797
966
798
967
plugin *p = getplugin(dirst->d_name);
799
968
if(p == NULL){
800
perror("getplugin");
969
error(0, errno, "getplugin");
801
970
free(filename);
802
971
continue;
803
972
}
815
984
if(g != NULL){
816
985
for(char **a = g->argv + 1; *a != NULL; a++){
817
986
if(not add_argument(p, *a)){
818
perror("add_argument");
987
error(0, errno, "add_argument");
819
988
}
820
989
}
821
990
/* Add global environment variables */
822
991
for(char **e = g->environ; *e != NULL; e++){
823
992
if(not add_environment(p, *e, false)){
824
perror("add_environment");
993
error(0, errno, "add_environment");
825
994
}
826
995
}
827
996
}
832
1001
if(p->environ[0] != NULL){
833
1002
for(char **e = environ; *e != NULL; e++){
834
1003
if(not add_environment(p, *e, false)){
835
perror("add_environment");
1004
error(0, errno, "add_environment");
836
1005
}
837
1006
}
838
1007
}
839
1008
840
1009
int pipefd[2];
841
ret = pipe(pipefd);
1010
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
842
1011
if(ret == -1){
843
perror("pipe");
844
exitstatus = EXIT_FAILURE;
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
845
1014
goto fallback;
846
1015
}
847
1016
/* Ask OS to automatic close the pipe on exec */
848
1017
ret = set_cloexec_flag(pipefd[0]);
849
1018
if(ret < 0){
850
perror("set_cloexec_flag");
851
exitstatus = EXIT_FAILURE;
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
852
1021
goto fallback;
853
1022
}
854
1023
ret = set_cloexec_flag(pipefd[1]);
855
1024
if(ret < 0){
856
perror("set_cloexec_flag");
857
exitstatus = EXIT_FAILURE;
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
858
1027
goto fallback;
859
1028
}
860
1029
/* Block SIGCHLD until process is safely in process list */
861
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1030
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
&sigchld_action.sa_mask,
1032
NULL));
862
1033
if(ret < 0){
863
perror("sigprocmask");
864
exitstatus = EXIT_FAILURE;
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
865
1036
goto fallback;
866
1037
}
867
1038
/* Starting a new process to be watched */
868
pid_t pid = fork();
1039
pid_t pid;
1040
do {
1041
pid = fork();
1042
} while(pid == -1 and errno == EINTR);
869
1043
if(pid == -1){
870
perror("fork");
871
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
872
1046
goto fallback;
873
1047
}
874
1048
if(pid == 0){
875
1049
/* this is the child process */
876
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
877
1051
if(ret < 0){
878
perror("sigaction");
879
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
880
1054
}
881
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
882
1056
if(ret < 0){
883
perror("sigprocmask");
884
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
885
1059
}
886
1060
887
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
888
1062
if(ret == -1){
889
perror("dup2");
890
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
891
1065
}
892
1066
893
1067
if(dirfd(dir) < 0){
897
1071
}
898
1072
if(p->environ[0] == NULL){
899
1073
if(execv(filename, p->argv) < 0){
900
perror("execv");
901
_exit(EXIT_FAILURE);
1074
error(0, errno, "execv for %s", filename);
1075
_exit(EX_OSERR);
902
1076
}
903
1077
} else {
904
1078
if(execve(filename, p->argv, p->environ) < 0){
905
perror("execve");
906
_exit(EXIT_FAILURE);
1079
error(0, errno, "execve for %s", filename);
1080
_exit(EX_OSERR);
907
1081
}
908
1082
}
909
1083
/* no return */
910
1084
}
911
1085
/* Parent process */
912
close(pipefd[1]); /* Close unused write end of pipe */
1086
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1087
pipe */
913
1088
free(filename);
914
1089
plugin *new_plugin = getplugin(dirst->d_name);
915
1090
if(new_plugin == NULL){
916
perror("getplugin");
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1094
NULL)));
918
1095
if(ret < 0){
919
perror("sigprocmask");
1096
error(0, errno, "sigprocmask");
920
1097
}
921
exitstatus = EXIT_FAILURE;
1098
exitstatus = EX_OSERR;
922
1099
goto fallback;
923
1100
}
924
1101
927
1104
928
1105
/* Unblock SIGCHLD so signal handler can be run if this process
929
1106
has already completed */
930
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
931
1110
if(ret < 0){
932
perror("sigprocmask");
933
exitstatus = EXIT_FAILURE;
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
934
1113
goto fallback;
935
1114
}
936
1115
937
FD_SET(new_plugin->fd, &rfds_all);
1116
#if defined (__GNUC__) and defined (__GLIBC__)
1117
#if not __GLIBC_PREREQ(2, 16)
1118
#pragma GCC diagnostic push
1119
#pragma GCC diagnostic ignored "-Wsign-conversion"
1120
#endif
1121
#endif
1122
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1123
-Wconversion in GNU libc
1124
before 2.16 */
1125
#if defined (__GNUC__) and defined (__GLIBC__)
1126
#if not __GLIBC_PREREQ(2, 16)
1127
#pragma GCC diagnostic pop
1128
#endif
1129
#endif
938
1130
939
1131
if(maxfd < new_plugin->fd){
940
1132
maxfd = new_plugin->fd;
941
1133
}
942
1134
}
943
1135
944
closedir(dir);
1136
TEMP_FAILURE_RETRY(closedir(dir));
945
1137
dir = NULL;
946
1138
free_plugin(getplugin(NULL));
947
1139
960
1152
while(plugin_list){
961
1153
fd_set rfds = rfds_all;
962
1154
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
963
if(select_ret == -1){
964
perror("select");
965
exitstatus = EXIT_FAILURE;
1155
if(select_ret == -1 and errno != EINTR){
1156
error(0, errno, "select");
1157
exitstatus = EX_OSERR;
966
1158
goto fallback;
967
1159
}
968
1160
/* OK, now either a process completed, or something can be read
994
1186
}
995
1187
996
1188
/* Remove the plugin */
997
FD_CLR(proc->fd, &rfds_all);
1189
#if defined (__GNUC__) and defined (__GLIBC__)
1190
#if not __GLIBC_PREREQ(2, 16)
1191
#pragma GCC diagnostic push
1192
#pragma GCC diagnostic ignored "-Wsign-conversion"
1193
#endif
1194
#endif
1195
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1196
-Wconversion in GNU libc
1197
before 2.16 */
1198
#if defined (__GNUC__) and defined (__GLIBC__)
1199
#if not __GLIBC_PREREQ(2, 16)
1200
#pragma GCC diagnostic pop
1201
#endif
1202
#endif
998
1203
999
1204
/* Block signal while modifying process_list */
1000
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1205
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1206
(SIG_BLOCK,
1207
&sigchld_action.sa_mask,
1208
NULL));
1001
1209
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1210
error(0, errno, "sigprocmask");
1211
exitstatus = EX_OSERR;
1004
1212
goto fallback;
1005
1213
}
1006
1214
1009
1217
proc = next_plugin;
1010
1218
1011
1219
/* We are done modifying process list, so unblock signal */
1012
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1013
NULL);
1220
ret = (int)(TEMP_FAILURE_RETRY
1221
(sigprocmask(SIG_UNBLOCK,
1222
&sigchld_action.sa_mask, NULL)));
1014
1223
if(ret < 0){
1015
perror("sigprocmask");
1016
exitstatus = EXIT_FAILURE;
1224
error(0, errno, "sigprocmask");
1225
exitstatus = EX_OSERR;
1017
1226
goto fallback;
1018
1227
}
1019
1228
1029
1238
bool bret = print_out_password(proc->buffer,
1030
1239
proc->buffer_length);
1031
1240
if(not bret){
1032
perror("print_out_password");
1033
exitstatus = EXIT_FAILURE;
1241
error(0, errno, "print_out_password");
1242
exitstatus = EX_IOERR;
1034
1243
}
1035
1244
goto fallback;
1036
1245
}
1037
1246
1038
1247
/* This process has not completed. Does it have any output? */
1039
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1248
#if defined (__GNUC__) and defined (__GLIBC__)
1249
#if not __GLIBC_PREREQ(2, 16)
1250
#pragma GCC diagnostic push
1251
#pragma GCC diagnostic ignored "-Wsign-conversion"
1252
#endif
1253
#endif
1254
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1255
warning from
1256
-Wconversion
1257
in GNU libc
1258
before
1259
2.16 */
1260
#if defined (__GNUC__) and defined (__GLIBC__)
1261
#if not __GLIBC_PREREQ(2, 16)
1262
#pragma GCC diagnostic pop
1263
#endif
1264
#endif
1040
1265
/* This process had nothing to say at this time */
1041
1266
proc = proc->next;
1042
1267
continue;
1043
1268
}
1044
1269
/* Before reading, make the process' data buffer large enough */
1045
1270
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1046
proc->buffer = realloc(proc->buffer, proc->buffer_size
1047
+ (size_t) BUFFER_SIZE);
1048
if(proc->buffer == NULL){
1049
perror("malloc");
1050
exitstatus = EXIT_FAILURE;
1271
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1272
+ (size_t) BUFFER_SIZE);
1273
if(new_buffer == NULL){
1274
error(0, errno, "malloc");
1275
exitstatus = EX_OSERR;
1051
1276
goto fallback;
1052
1277
}
1278
proc->buffer = new_buffer;
1053
1279
proc->buffer_size += BUFFER_SIZE;
1054
1280
}
1055
1281
/* Read from the process */
1056
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1057
BUFFER_SIZE);
1282
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1283
proc->buffer
1284
+ proc->buffer_length,
1285
BUFFER_SIZE));
1058
1286
if(sret < 0){
1059
1287
/* Read error from this process; ignore the error */
1060
1288
proc = proc->next;
1072
1300
1073
1301
fallback:
1074
1302
1075
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1303
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1304
and exitstatus != EX_OK)){
1076
1305
/* Fallback if all plugins failed, none are found or an error
1077
1306
occured */
1078
1307
bool bret;
1086
1315
}
1087
1316
bret = print_out_password(passwordbuffer, len);
1088
1317
if(not bret){
1089
perror("print_out_password");
1090
exitstatus = EXIT_FAILURE;
1318
error(0, errno, "print_out_password");
1319
exitstatus = EX_IOERR;
1091
1320
}
1092
1321
}
1093
1322
1094
1323
/* Restore old signal handler */
1095
1324
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1096
1325
if(ret == -1){
1097
perror("sigaction");
1098
exitstatus = EXIT_FAILURE;
1326
error(0, errno, "sigaction");
1327
exitstatus = EX_OSERR;
1099
1328
}
1100
1329
1101
1330
if(custom_argv != NULL){
1116
1345
ret = kill(p->pid, SIGTERM);
1117
1346
if(ret == -1 and errno != ESRCH){
1118
1347
/* Set-uid proccesses might not get closed */
1119
perror("kill");
1348
error(0, errno, "kill");
1120
1349
}
1121
1350
}
1122
1351
}
1123
1352
1124
1353
/* Wait for any remaining child processes to terminate */
1125
do{
1354
do {
1126
1355
ret = wait(NULL);
1127
1356
} while(ret >= 0);
1128
1357
if(errno != ECHILD){
1129
perror("wait");
1358
error(0, errno, "wait");
1130
1359
}
1131
1360
1132
1361
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0