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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:35:19 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113043519-0yr39snphoegq8l1
* plugin-runner.c: Only space changes.
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/password-prompt.c: - '' -
- files removed:
- dbus-mandos.conf
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
67
74
68
#define BUFFER_SIZE 256
75
69
86
80
char **environ;
87
81
int envc;
88
82
bool disabled;
89
83
90
84
/* Variables used for running processes*/
91
85
pid_t pid;
92
86
int fd;
94
88
size_t buffer_size;
95
89
size_t buffer_length;
96
90
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
91
volatile bool completed;
92
volatile int status;
99
93
struct plugin *next;
100
94
} plugin;
101
95
104
98
/* Gets an existing plugin based on name,
105
99
or if none is found, creates a new one */
106
100
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
101
/* Check for exiting plugin with that name */
108
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
103
if((p->name == name)
110
104
or (p->name and name and (strcmp(p->name, name) == 0))){
112
106
}
113
107
}
114
108
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
109
plugin *new_plugin = malloc(sizeof(plugin));
119
110
if(new_plugin == NULL){
120
111
return NULL;
121
112
}
122
113
char *copy_name = NULL;
123
114
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
127
116
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
117
return NULL;
132
118
}
133
119
}
134
120
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
139
125
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
126
new_plugin->argv = malloc(sizeof(char *) * 2);
143
127
if(new_plugin->argv == NULL){
144
int e = errno;
145
128
free(copy_name);
146
129
free(new_plugin);
147
errno = e;
148
130
return NULL;
149
131
}
150
132
new_plugin->argv[0] = copy_name;
151
133
new_plugin->argv[1] = NULL;
152
134
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
156
136
if(new_plugin->environ == NULL){
157
int e = errno;
158
137
free(copy_name);
159
138
free(new_plugin->argv);
160
139
free(new_plugin);
161
errno = e;
162
140
return NULL;
163
141
}
164
142
new_plugin->environ[0] = NULL;
172
150
static bool add_to_char_array(const char *new, char ***array,
173
151
int *len){
174
152
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
179
155
/* Malloc check */
180
156
if(*array == NULL){
181
157
return false;
182
158
}
183
159
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
188
161
if(copy == NULL){
189
162
return false;
190
163
}
216
189
if(strncmp(*e, def, namelen + 1) == 0){
217
190
/* It already exists */
218
191
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
223
193
if(new == NULL){
224
194
return false;
225
195
}
235
205
/*
236
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
207
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
209
*/
240
210
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
242
212
/* If reading the flags failed, return error indication now. */
243
213
if(ret < 0){
244
214
return ret;
245
215
}
246
216
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
218
}
250
219
251
220
252
221
/* Mark processes as completed when they exit, and save their exit
253
222
status. */
254
223
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
224
while(true){
257
225
plugin *proc = plugin_list;
258
226
int status;
262
230
break;
263
231
}
264
232
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
233
if(errno != ECHILD){
234
perror("waitpid");
268
235
}
269
perror("waitpid");
236
/* No child processes */
237
break;
270
238
}
271
239
272
240
/* A child exited, find it in process_list */
278
246
continue;
279
247
}
280
248
proc->status = status;
281
proc->completed = 1;
249
proc->completed = true;
282
250
}
283
errno = old_errno;
284
251
}
285
252
286
253
/* Prints out a password to stdout */
308
275
}
309
276
free(plugin_node->environ);
310
277
free(plugin_node->buffer);
311
278
312
279
/* Removes the plugin from the singly-linked list */
313
280
if(plugin_node == plugin_list){
314
281
/* First one - simple */
358
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
326
if(ret == -1){
360
327
perror("sigaddset");
361
exitstatus = EX_OSERR;
328
exitstatus = EXIT_FAILURE;
362
329
goto fallback;
363
330
}
364
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
332
if(ret == -1){
366
333
perror("sigaction");
367
exitstatus = EX_OSERR;
334
exitstatus = EXIT_FAILURE;
368
335
goto fallback;
369
336
}
370
337
402
369
.doc = "Group ID the plugins will run as", .group = 3 },
403
370
{ .name = "debug", .key = 132,
404
371
.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 },
414
372
{ .name = NULL }
415
373
};
416
374
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;
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
422
378
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
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;
428
388
}
429
389
}
430
390
}
431
391
break;
432
392
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
434
399
break;
435
400
case 'o': /* --options-for */
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;
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;
454
418
}
455
419
}
456
420
}
457
421
break;
458
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
459
426
{
460
427
char *envdef = strchr(arg, ':');
461
428
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
429
break;
465
430
}
466
431
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
472
434
}
473
add_environment(getplugin(arg), envdef, true);
474
435
}
475
436
break;
476
437
case 'd': /* --disable */
477
{
438
if(arg != NULL){
478
439
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
481
442
}
443
p->disabled = true;
482
444
}
483
445
break;
484
446
case 'e': /* --enable */
485
{
447
if(arg != NULL){
486
448
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
489
451
}
452
p->disabled = false;
490
453
}
491
454
break;
492
455
case 128: /* --plugin-dir */
493
456
free(plugindir);
494
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
495
461
break;
496
462
case 129: /* --config-file */
497
463
/* This is already done by parse_opt_config_file() */
498
464
break;
499
465
case 130: /* --userid */
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;
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
506
471
}
507
uid = (uid_t)tmpmax;
508
472
break;
509
473
case 131: /* --groupid */
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;
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
516
479
}
517
gid = (gid_t)tmpmax;
518
480
break;
519
481
case 132: /* --debug */
520
482
debug = true;
521
483
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
484
/*
537
485
* When adding more options before this line, remember to also add a
538
486
* "case" to the "parse_opt_config_file" function below.
541
489
/* Cryptsetup always passes an argument, which is an empty
542
490
string if "none" was specified in /etc/crypttab. So if
543
491
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
547
498
default:
548
499
return ARGP_ERR_UNKNOWN;
549
500
}
550
return errno; /* Set to 0 at start */
501
return 0;
551
502
}
552
503
553
504
/* This option parser is the same as parse_opt() above, except it
554
505
ignores everything but the --config-file option. */
555
506
error_t parse_opt_config_file(int key, char *arg,
556
507
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
508
struct argp_state *state) {
509
switch(key) {
560
510
case 'g': /* --global-options */
561
511
case 'G': /* --global-env */
562
512
case 'o': /* --options-for */
568
518
case 129: /* --config-file */
569
519
free(argfile);
570
520
argfile = strdup(arg);
571
break;
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
572
525
case 130: /* --userid */
573
526
case 131: /* --groupid */
574
527
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
579
530
break;
580
531
default:
581
532
return ARGP_ERR_UNKNOWN;
582
533
}
583
return errno;
534
return 0;
584
535
}
585
536
586
537
struct argp argp = { .options = options,
590
541
591
542
/* Parse using parse_opt_config_file() in order to get the custom
592
543
config file location, if any. */
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;
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
607
548
goto fallback;
608
549
}
609
550
615
556
conffp = fopen(AFILE, "r");
616
557
} else {
617
558
conffp = fopen(argfile, "r");
618
}
559
}
619
560
if(conffp != NULL){
620
561
char *org_line = NULL;
621
562
char *p, *arg, *new_arg, *line;
622
563
size_t size = 0;
623
564
const char whitespace_delims[] = " \r\t\f\v\n";
624
565
const char comment_delim[] = "#";
625
566
626
567
custom_argc = 1;
627
568
custom_argv = malloc(sizeof(char*) * 2);
628
569
if(custom_argv == NULL){
629
570
perror("malloc");
630
exitstatus = EX_OSERR;
571
exitstatus = EXIT_FAILURE;
631
572
goto fallback;
632
573
}
633
574
custom_argv[0] = argv[0];
634
575
custom_argv[1] = NULL;
635
576
636
577
/* for each line in the config file, strip whitespace and ignore
637
578
commented text */
638
579
while(true){
640
581
if(sret == -1){
641
582
break;
642
583
}
643
584
644
585
line = org_line;
645
586
arg = strsep(&line, comment_delim);
646
587
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
591
new_arg = strdup(p);
651
592
if(new_arg == NULL){
652
593
perror("strdup");
653
exitstatus = EX_OSERR;
594
exitstatus = EXIT_FAILURE;
654
595
free(org_line);
655
596
goto fallback;
656
597
}
660
601
* ((unsigned int) custom_argc + 1));
661
602
if(custom_argv == NULL){
662
603
perror("realloc");
663
exitstatus = EX_OSERR;
604
exitstatus = EXIT_FAILURE;
664
605
free(org_line);
665
606
goto fallback;
666
607
}
667
608
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
669
610
}
670
611
}
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
}
679
612
free(org_line);
680
613
} else {
681
614
/* Check for harmful errors and go to fallback. Other errors might
682
615
not affect opening plugins */
683
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
617
perror("fopen");
685
exitstatus = EX_OSERR;
618
exitstatus = EXIT_FAILURE;
686
619
goto fallback;
687
620
}
688
621
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
691
624
if(custom_argv != NULL){
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;
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
706
630
goto fallback;
707
631
}
708
632
}
709
633
710
634
/* Parse actual command line arguments, to let them override the
711
635
config file */
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;
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
726
640
goto fallback;
727
641
}
728
642
733
647
for(char **a = p->argv; *a != NULL; a++){
734
648
fprintf(stderr, "\tArg: %s\n", *a);
735
649
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
651
for(char **a = p->environ; *a != NULL; a++){
738
652
fprintf(stderr, "\t%s\n", *a);
739
653
}
741
655
}
742
656
743
657
/* Strip permissions down to nobody */
658
ret = setuid(uid);
659
if(ret == -1){
660
perror("setuid");
661
}
744
662
setgid(gid);
745
663
if(ret == -1){
746
664
perror("setgid");
747
665
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
666
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
680
{
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;
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
688
}
796
689
}
797
690
}
798
691
800
693
801
694
/* Read and execute any executable in the plugin directory*/
802
695
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
696
dirst = readdir(dir);
806
697
807
698
/* All directory entries have been processed */
808
699
if(dirst == NULL){
809
700
if(errno == EBADF){
810
701
perror("readdir");
811
exitstatus = EX_IOERR;
702
exitstatus = EXIT_FAILURE;
812
703
goto fallback;
813
704
}
814
705
break;
859
750
continue;
860
751
}
861
752
}
862
753
863
754
char *filename;
864
755
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
757
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
759
}
872
760
if(ret < 0){
873
761
perror("asprintf");
874
762
continue;
875
763
}
876
764
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
765
ret = stat(filename, &st);
878
766
if(ret == -1){
879
767
perror("stat");
880
768
free(filename);
881
769
continue;
882
770
}
883
771
884
772
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
774
if(debug){
888
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
776
" with bad type or mode\n", filename);
935
822
}
936
823
937
824
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
825
ret = pipe(pipefd);
939
826
if(ret == -1){
940
827
perror("pipe");
941
exitstatus = EX_OSERR;
828
exitstatus = EXIT_FAILURE;
942
829
goto fallback;
943
830
}
944
831
/* Ask OS to automatic close the pipe on exec */
945
832
ret = set_cloexec_flag(pipefd[0]);
946
833
if(ret < 0){
947
834
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
835
exitstatus = EXIT_FAILURE;
949
836
goto fallback;
950
837
}
951
838
ret = set_cloexec_flag(pipefd[1]);
952
839
if(ret < 0){
953
840
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
841
exitstatus = EXIT_FAILURE;
955
842
goto fallback;
956
843
}
957
844
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
846
if(ret < 0){
962
847
perror("sigprocmask");
963
exitstatus = EX_OSERR;
848
exitstatus = EXIT_FAILURE;
964
849
goto fallback;
965
850
}
966
851
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
852
pid_t pid = fork();
971
853
if(pid == -1){
972
854
perror("fork");
973
exitstatus = EX_OSERR;
855
exitstatus = EXIT_FAILURE;
974
856
goto fallback;
975
857
}
976
858
if(pid == 0){
978
860
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
861
if(ret < 0){
980
862
perror("sigaction");
981
_exit(EX_OSERR);
863
_exit(EXIT_FAILURE);
982
864
}
983
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
866
if(ret < 0){
985
867
perror("sigprocmask");
986
_exit(EX_OSERR);
868
_exit(EXIT_FAILURE);
987
869
}
988
870
989
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
872
if(ret == -1){
991
873
perror("dup2");
992
_exit(EX_OSERR);
874
_exit(EXIT_FAILURE);
993
875
}
994
876
995
877
if(dirfd(dir) < 0){
1000
882
if(p->environ[0] == NULL){
1001
883
if(execv(filename, p->argv) < 0){
1002
884
perror("execv");
1003
_exit(EX_OSERR);
885
_exit(EXIT_FAILURE);
1004
886
}
1005
887
} else {
1006
888
if(execve(filename, p->argv, p->environ) < 0){
1007
889
perror("execve");
1008
_exit(EX_OSERR);
890
_exit(EXIT_FAILURE);
1009
891
}
1010
892
}
1011
893
/* no return */
1012
894
}
1013
895
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
896
close(pipefd[1]); /* Close unused write end of pipe */
1016
897
free(filename);
1017
898
plugin *new_plugin = getplugin(dirst->d_name);
1018
899
if(new_plugin == NULL){
1019
900
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
902
if(ret < 0){
1024
903
perror("sigprocmask");
1025
904
}
1026
exitstatus = EX_OSERR;
905
exitstatus = EXIT_FAILURE;
1027
906
goto fallback;
1028
907
}
1029
908
1032
911
1033
912
/* Unblock SIGCHLD so signal handler can be run if this process
1034
913
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
915
if(ret < 0){
1039
916
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
917
exitstatus = EXIT_FAILURE;
1041
918
goto fallback;
1042
919
}
1043
920
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
921
FD_SET(new_plugin->fd, &rfds_all);
1046
922
1047
923
if(maxfd < new_plugin->fd){
1048
924
maxfd = new_plugin->fd;
1049
925
}
1050
926
}
1051
927
1052
TEMP_FAILURE_RETRY(closedir(dir));
928
closedir(dir);
1053
929
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
930
1056
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
932
if(p->pid != 0){
1068
943
while(plugin_list){
1069
944
fd_set rfds = rfds_all;
1070
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
946
if(select_ret == -1){
1072
947
perror("select");
1073
exitstatus = EX_OSERR;
948
exitstatus = EXIT_FAILURE;
1074
949
goto fallback;
1075
950
}
1076
951
/* OK, now either a process completed, or something can be read
1077
952
from one of them */
1078
953
for(plugin *proc = plugin_list; proc != NULL;){
1079
954
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1081
956
/* Only accept the plugin output if it exited cleanly */
1082
957
if(not WIFEXITED(proc->status)
1083
958
or WEXITSTATUS(proc->status) != 0){
1084
959
/* Bad exit by plugin */
1085
960
1086
961
if(debug){
1087
962
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1091
965
WEXITSTATUS(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)));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1098
970
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1101
973
}
1102
974
}
1103
975
1104
976
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
977
FD_CLR(proc->fd, &rfds_all);
978
1108
979
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
981
if(ret < 0){
1114
982
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
983
exitstatus = EXIT_FAILURE;
1116
984
goto fallback;
1117
985
}
1118
986
1121
989
proc = next_plugin;
1122
990
1123
991
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1127
994
if(ret < 0){
1128
995
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
996
exitstatus = EXIT_FAILURE;
1130
997
goto fallback;
1131
998
}
1132
999
1143
1010
proc->buffer_length);
1144
1011
if(not bret){
1145
1012
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1013
exitstatus = EXIT_FAILURE;
1147
1014
}
1148
1015
goto fallback;
1149
1016
}
1150
1017
1151
1018
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1020
/* This process had nothing to say at this time */
1156
1021
proc = proc->next;
1157
1022
continue;
1162
1027
+ (size_t) BUFFER_SIZE);
1163
1028
if(proc->buffer == NULL){
1164
1029
perror("malloc");
1165
exitstatus = EX_OSERR;
1030
exitstatus = EXIT_FAILURE;
1166
1031
goto fallback;
1167
1032
}
1168
1033
proc->buffer_size += BUFFER_SIZE;
1169
1034
}
1170
1035
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1175
1038
if(sret < 0){
1176
1039
/* Read error from this process; ignore the error */
1177
1040
proc = proc->next;
1185
1048
}
1186
1049
}
1187
1050
}
1188
1189
1051
1052
1190
1053
fallback:
1191
1054
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1056
/* Fallback if all plugins failed, none are found or an error
1195
1057
occured */
1196
1058
bool bret;
1205
1067
bret = print_out_password(passwordbuffer, len);
1206
1068
if(not bret){
1207
1069
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1070
exitstatus = EXIT_FAILURE;
1209
1071
}
1210
1072
}
1211
1073
1213
1075
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1076
if(ret == -1){
1215
1077
perror("sigaction");
1216
exitstatus = EX_OSERR;
1078
exitstatus = EXIT_FAILURE;
1217
1079
}
1218
1080
1219
1081
if(custom_argv != NULL){
1240
1102
}
1241
1103
1242
1104
/* Wait for any remaining child processes to terminate */
1243
do {
1105
do{
1244
1106
ret = wait(NULL);
1245
1107
} while(ret >= 0);
1246
1108
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0