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- Committer: teddy at bsnet
- Date: 2010-09-08 19:25:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20100908192513-ccso0jpam3qg4yze
* TODO: Clarifications.
- files added:
- dbus-mandos.conf
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
67
73
68
74
#define BUFFER_SIZE 256
69
75
80
86
char **environ;
81
87
int envc;
82
88
bool disabled;
83
89
84
90
/* Variables used for running processes*/
85
91
pid_t pid;
86
92
int fd;
88
94
size_t buffer_size;
89
95
size_t buffer_length;
90
96
bool eof;
91
volatile bool completed;
92
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
93
99
struct plugin *next;
94
100
} plugin;
95
101
98
104
/* Gets an existing plugin based on name,
99
105
or if none is found, creates a new one */
100
106
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
105
111
return p;
106
112
}
107
113
}
108
114
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
111
120
return NULL;
112
121
}
113
122
char *copy_name = NULL;
114
123
if(name != NULL){
115
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
117
131
return NULL;
118
132
}
119
133
}
120
134
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
125
139
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
128
145
free(copy_name);
129
146
free(new_plugin);
147
errno = e;
130
148
return NULL;
131
149
}
132
150
new_plugin->argv[0] = copy_name;
133
151
new_plugin->argv[1] = NULL;
134
152
135
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
136
156
if(new_plugin->environ == NULL){
157
int e = errno;
137
158
free(copy_name);
138
159
free(new_plugin->argv);
139
160
free(new_plugin);
161
errno = e;
140
162
return NULL;
141
163
}
142
164
new_plugin->environ[0] = NULL;
150
172
static bool add_to_char_array(const char *new, char ***array,
151
173
int *len){
152
174
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
155
179
/* Malloc check */
156
180
if(*array == NULL){
157
181
return false;
158
182
}
159
183
/* Make a copy of the new string */
160
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
188
if(copy == NULL){
162
189
return false;
163
190
}
189
216
if(strncmp(*e, def, namelen + 1) == 0){
190
217
/* It already exists */
191
218
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
193
223
if(new == NULL){
194
224
return false;
195
225
}
205
235
/*
206
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
237
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
239
*/
210
240
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
242
/* If reading the flags failed, return error indication now. */
213
243
if(ret < 0){
214
244
return ret;
215
245
}
216
246
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
218
249
}
219
250
220
251
221
252
/* Mark processes as completed when they exit, and save their exit
222
253
status. */
223
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
224
256
while(true){
225
257
plugin *proc = plugin_list;
226
258
int status;
230
262
break;
231
263
}
232
264
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
235
268
}
236
/* No child processes */
237
break;
269
perror("waitpid");
238
270
}
239
271
240
272
/* A child exited, find it in process_list */
246
278
continue;
247
279
}
248
280
proc->status = status;
249
proc->completed = true;
281
proc->completed = 1;
250
282
}
283
errno = old_errno;
251
284
}
252
285
253
286
/* Prints out a password to stdout */
275
308
}
276
309
free(plugin_node->environ);
277
310
free(plugin_node->buffer);
278
311
279
312
/* Removes the plugin from the singly-linked list */
280
313
if(plugin_node == plugin_list){
281
314
/* First one - simple */
325
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
359
if(ret == -1){
327
360
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
329
362
goto fallback;
330
363
}
331
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
365
if(ret == -1){
333
366
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
335
368
goto fallback;
336
369
}
337
370
369
402
.doc = "Group ID the plugins will run as", .group = 3 },
370
403
{ .name = "debug", .key = 132,
371
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
372
414
{ .name = NULL }
373
415
};
374
416
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
378
422
case 'g': /* --global-options */
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
388
428
}
389
429
}
390
430
}
391
431
break;
392
432
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
433
add_environment(getplugin(NULL), arg, true);
399
434
break;
400
435
case 'o': /* --options-for */
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
418
454
}
419
455
}
420
456
}
421
457
break;
422
458
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
459
{
427
460
char *envdef = strchr(arg, ':');
428
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
429
464
break;
430
465
}
431
466
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
434
472
}
473
add_environment(getplugin(arg), envdef, true);
435
474
}
436
475
break;
437
476
case 'd': /* --disable */
438
if (arg != NULL){
477
{
439
478
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
442
481
}
443
p->disabled = true;
444
482
}
445
483
break;
446
484
case 'e': /* --enable */
447
if (arg != NULL){
485
{
448
486
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
451
489
}
452
p->disabled = false;
453
490
}
454
491
break;
455
492
case 128: /* --plugin-dir */
456
493
free(plugindir);
457
494
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
495
break;
462
496
case 129: /* --config-file */
463
497
/* This is already done by parse_opt_config_file() */
464
498
break;
465
499
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
467
508
break;
468
509
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
470
518
break;
471
519
case 132: /* --debug */
472
520
debug = true;
473
521
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
474
540
case ARGP_KEY_ARG:
475
541
/* Cryptsetup always passes an argument, which is an empty
476
542
string if "none" was specified in /etc/crypttab. So if
477
543
argument was empty, we ignore it silently. */
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
544
if(arg[0] == '\0'){
545
break;
480
546
}
481
break;
482
case ARGP_KEY_END:
483
break;
484
547
default:
485
548
return ARGP_ERR_UNKNOWN;
486
549
}
487
return 0;
550
return errno; /* Set to 0 at start */
488
551
}
489
552
490
553
/* This option parser is the same as parse_opt() above, except it
491
554
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
496
560
case 'g': /* --global-options */
497
561
case 'G': /* --global-env */
498
562
case 'o': /* --options-for */
504
568
case 129: /* --config-file */
505
569
free(argfile);
506
570
argfile = strdup(arg);
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
571
break;
511
572
case 130: /* --userid */
512
573
case 131: /* --groupid */
513
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
514
578
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
516
579
break;
517
580
default:
518
581
return ARGP_ERR_UNKNOWN;
519
582
}
520
return 0;
583
return errno;
521
584
}
522
585
523
586
struct argp argp = { .options = options,
525
588
.args_doc = "",
526
589
.doc = "Mandos plugin runner -- Run plugins" };
527
590
528
/* Parse using the parse_opt_config_file in order to get the custom
591
/* Parse using parse_opt_config_file() in order to get the custom
529
592
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
534
607
goto fallback;
535
608
}
536
609
538
611
argp.parser = parse_opt;
539
612
540
613
/* Open the configfile if available */
541
if (argfile == NULL){
614
if(argfile == NULL){
542
615
conffp = fopen(AFILE, "r");
543
616
} else {
544
617
conffp = fopen(argfile, "r");
545
}
618
}
546
619
if(conffp != NULL){
547
620
char *org_line = NULL;
548
621
char *p, *arg, *new_arg, *line;
549
622
size_t size = 0;
550
623
const char whitespace_delims[] = " \r\t\f\v\n";
551
624
const char comment_delim[] = "#";
552
625
553
626
custom_argc = 1;
554
627
custom_argv = malloc(sizeof(char*) * 2);
555
628
if(custom_argv == NULL){
556
629
perror("malloc");
557
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
558
631
goto fallback;
559
632
}
560
633
custom_argv[0] = argv[0];
561
634
custom_argv[1] = NULL;
562
635
563
636
/* for each line in the config file, strip whitespace and ignore
564
637
commented text */
565
638
while(true){
567
640
if(sret == -1){
568
641
break;
569
642
}
570
643
571
644
line = org_line;
572
645
arg = strsep(&line, comment_delim);
573
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
577
650
new_arg = strdup(p);
578
651
if(new_arg == NULL){
579
652
perror("strdup");
580
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
581
654
free(org_line);
582
655
goto fallback;
583
656
}
587
660
* ((unsigned int) custom_argc + 1));
588
661
if(custom_argv == NULL){
589
662
perror("realloc");
590
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
591
664
free(org_line);
592
665
goto fallback;
593
666
}
594
667
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
596
669
}
597
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
598
679
free(org_line);
599
680
} else {
600
681
/* Check for harmful errors and go to fallback. Other errors might
601
682
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
684
perror("fopen");
604
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
605
686
goto fallback;
606
687
}
607
688
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
610
691
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
616
706
goto fallback;
617
707
}
618
708
}
619
709
620
710
/* Parse actual command line arguments, to let them override the
621
711
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
626
726
goto fallback;
627
727
}
628
728
633
733
for(char **a = p->argv; *a != NULL; a++){
634
734
fprintf(stderr, "\tArg: %s\n", *a);
635
735
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
737
for(char **a = p->environ; *a != NULL; a++){
638
738
fprintf(stderr, "\t%s\n", *a);
639
739
}
641
741
}
642
742
643
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
644
748
ret = setuid(uid);
645
if (ret == -1){
749
if(ret == -1){
646
750
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
666
754
{
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
675
796
}
676
797
}
677
798
679
800
680
801
/* Read and execute any executable in the plugin directory*/
681
802
while(true){
682
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
683
806
684
807
/* All directory entries have been processed */
685
808
if(dirst == NULL){
686
if (errno == EBADF){
809
if(errno == EBADF){
687
810
perror("readdir");
688
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
689
812
goto fallback;
690
813
}
691
814
break;
721
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
845
size_t suf_len = strlen(*suf);
723
846
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
848
== 0)){
726
849
if(debug){
727
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
736
859
continue;
737
860
}
738
861
}
739
862
740
863
char *filename;
741
864
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
743
867
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
745
871
}
746
872
if(ret < 0){
747
873
perror("asprintf");
748
874
continue;
749
875
}
750
876
751
ret = stat(filename, &st);
752
if (ret == -1){
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
753
879
perror("stat");
754
880
free(filename);
755
881
continue;
756
882
}
757
883
758
884
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
887
if(debug){
761
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
889
" with bad type or mode\n", filename);
808
935
}
809
936
810
937
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
813
940
perror("pipe");
814
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
815
942
goto fallback;
816
943
}
817
944
/* Ask OS to automatic close the pipe on exec */
818
945
ret = set_cloexec_flag(pipefd[0]);
819
946
if(ret < 0){
820
947
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
822
949
goto fallback;
823
950
}
824
951
ret = set_cloexec_flag(pipefd[1]);
825
952
if(ret < 0){
826
953
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
828
955
goto fallback;
829
956
}
830
957
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
832
961
if(ret < 0){
833
962
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
835
964
goto fallback;
836
965
}
837
966
/* Starting a new process to be watched */
838
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
839
971
if(pid == -1){
840
972
perror("fork");
841
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
842
974
goto fallback;
843
975
}
844
976
if(pid == 0){
846
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
979
if(ret < 0){
848
980
perror("sigaction");
849
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
850
982
}
851
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
984
if(ret < 0){
853
985
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
855
987
}
856
988
857
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
990
if(ret == -1){
859
991
perror("dup2");
860
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
861
993
}
862
994
863
995
if(dirfd(dir) < 0){
868
1000
if(p->environ[0] == NULL){
869
1001
if(execv(filename, p->argv) < 0){
870
1002
perror("execv");
871
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
872
1004
}
873
1005
} else {
874
1006
if(execve(filename, p->argv, p->environ) < 0){
875
1007
perror("execve");
876
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
877
1009
}
878
1010
}
879
1011
/* no return */
880
1012
}
881
1013
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
883
1016
free(filename);
884
1017
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
1018
if(new_plugin == NULL){
886
1019
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
888
1023
if(ret < 0){
889
1024
perror("sigprocmask");
890
1025
}
891
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
892
1027
goto fallback;
893
1028
}
894
1029
897
1032
898
1033
/* Unblock SIGCHLD so signal handler can be run if this process
899
1034
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
901
1038
if(ret < 0){
902
1039
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
904
1041
goto fallback;
905
1042
}
906
1043
907
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
908
1046
909
if (maxfd < new_plugin->fd){
1047
if(maxfd < new_plugin->fd){
910
1048
maxfd = new_plugin->fd;
911
1049
}
912
1050
}
913
1051
914
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
915
1053
dir = NULL;
1054
free_plugin(getplugin(NULL));
916
1055
917
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
1057
if(p->pid != 0){
929
1068
while(plugin_list){
930
1069
fd_set rfds = rfds_all;
931
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
933
1072
perror("select");
934
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
935
1074
goto fallback;
936
1075
}
937
1076
/* OK, now either a process completed, or something can be read
938
1077
from one of them */
939
1078
for(plugin *proc = plugin_list; proc != NULL;){
940
1079
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
942
1081
/* Only accept the plugin output if it exited cleanly */
943
1082
if(not WIFEXITED(proc->status)
944
1083
or WEXITSTATUS(proc->status) != 0){
945
1084
/* Bad exit by plugin */
946
1085
947
1086
if(debug){
948
1087
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
951
1091
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
956
1098
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
959
1101
}
960
1102
}
961
1103
962
1104
/* Remove the plugin */
963
FD_CLR(proc->fd, &rfds_all);
964
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
965
1108
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
967
1113
if(ret < 0){
968
1114
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
970
1116
goto fallback;
971
1117
}
972
1118
975
1121
proc = next_plugin;
976
1122
977
1123
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
980
1127
if(ret < 0){
981
1128
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
983
1130
goto fallback;
984
1131
}
985
1132
996
1143
proc->buffer_length);
997
1144
if(not bret){
998
1145
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1000
1147
}
1001
1148
goto fallback;
1002
1149
}
1003
1150
1004
1151
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1006
1155
/* This process had nothing to say at this time */
1007
1156
proc = proc->next;
1008
1157
continue;
1011
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
1162
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1163
if(proc->buffer == NULL){
1015
1164
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1017
1166
goto fallback;
1018
1167
}
1019
1168
proc->buffer_size += BUFFER_SIZE;
1020
1169
}
1021
1170
/* Read from the process */
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1024
1175
if(sret < 0){
1025
1176
/* Read error from this process; ignore the error */
1026
1177
proc = proc->next;
1034
1185
}
1035
1186
}
1036
1187
}
1037
1038
1188
1189
1039
1190
fallback:
1040
1191
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1042
1194
/* Fallback if all plugins failed, none are found or an error
1043
1195
occured */
1044
1196
bool bret;
1053
1205
bret = print_out_password(passwordbuffer, len);
1054
1206
if(not bret){
1055
1207
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1057
1209
}
1058
1210
}
1059
1211
1061
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
1214
if(ret == -1){
1063
1215
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1065
1217
}
1066
1218
1067
1219
if(custom_argv != NULL){
1088
1240
}
1089
1241
1090
1242
/* Wait for any remaining child processes to terminate */
1091
do{
1243
do {
1092
1244
ret = wait(NULL);
1093
1245
} while(ret >= 0);
1094
1246
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0