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- Committer: Björn Påhlsson
- Date: 2009-01-16 23:19:44 UTC
- mfrom: (271 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 291.
- Revision ID: belorn@braxen-20090116231944-qw97sandjaohrywo
merge
- files removed:
- dbus-mandos.conf
- 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(), strcmp(), strncmp() */
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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
73
68
74
69
#define BUFFER_SIZE 256
75
70
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
94
89
size_t buffer_size;
95
90
size_t buffer_length;
96
91
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
92
volatile bool completed;
93
volatile int status;
99
94
struct plugin *next;
100
95
} plugin;
101
96
104
99
/* Gets an existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
108
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
104
if((p->name == name)
110
105
or (p->name and name and (strcmp(p->name, name) == 0))){
112
107
}
113
108
}
114
109
/* 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);
110
plugin *new_plugin = malloc(sizeof(plugin));
119
111
if(new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
118
return NULL;
132
119
}
133
120
}
134
121
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
126
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
127
new_plugin->argv = malloc(sizeof(char *) * 2);
143
128
if(new_plugin->argv == NULL){
144
int e = errno;
145
129
free(copy_name);
146
130
free(new_plugin);
147
errno = e;
148
131
return NULL;
149
132
}
150
133
new_plugin->argv[0] = copy_name;
151
134
new_plugin->argv[1] = NULL;
152
135
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
156
137
if(new_plugin->environ == NULL){
157
int e = errno;
158
138
free(copy_name);
159
139
free(new_plugin->argv);
160
140
free(new_plugin);
161
errno = e;
162
141
return NULL;
163
142
}
164
143
new_plugin->environ[0] = NULL;
172
151
static bool add_to_char_array(const char *new, char ***array,
173
152
int *len){
174
153
/* 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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
156
/* Malloc check */
180
157
if(*array == NULL){
181
158
return false;
182
159
}
183
160
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
188
162
if(copy == NULL){
189
163
return false;
190
164
}
216
190
if(strncmp(*e, def, namelen + 1) == 0){
217
191
/* It already exists */
218
192
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
223
194
if(new == NULL){
224
195
return false;
225
196
}
235
206
/*
236
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
208
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
210
*/
240
211
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
int ret = fcntl(fd, F_GETFD, 0);
242
213
/* If reading the flags failed, return error indication now. */
243
214
if(ret < 0){
244
215
return ret;
245
216
}
246
217
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
219
}
250
220
251
221
252
222
/* Mark processes as completed when they exit, and save their exit
253
223
status. */
254
224
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
225
while(true){
257
226
plugin *proc = plugin_list;
258
227
int status;
262
231
break;
263
232
}
264
233
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
234
if(errno != ECHILD){
235
perror("waitpid");
268
236
}
269
perror("waitpid");
237
/* No child processes */
238
break;
270
239
}
271
240
272
241
/* A child exited, find it in process_list */
278
247
continue;
279
248
}
280
249
proc->status = status;
281
proc->completed = 1;
250
proc->completed = true;
282
251
}
283
errno = old_errno;
284
252
}
285
253
286
254
/* Prints out a password to stdout */
308
276
}
309
277
free(plugin_node->environ);
310
278
free(plugin_node->buffer);
311
279
312
280
/* Removes the plugin from the singly-linked list */
313
281
if(plugin_node == plugin_list){
314
282
/* First one - simple */
341
309
struct dirent *dirst;
342
310
struct stat st;
343
311
fd_set rfds_all;
344
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
345
313
ssize_t sret;
314
intmax_t tmpmax;
346
315
uid_t uid = 65534;
347
316
gid_t gid = 65534;
348
317
bool debug = false;
358
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
328
if(ret == -1){
360
329
perror("sigaddset");
361
exitstatus = EX_OSERR;
330
exitstatus = EXIT_FAILURE;
362
331
goto fallback;
363
332
}
364
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
334
if(ret == -1){
366
335
perror("sigaction");
367
exitstatus = EX_OSERR;
336
exitstatus = EXIT_FAILURE;
368
337
goto fallback;
369
338
}
370
339
402
371
.doc = "Group ID the plugins will run as", .group = 3 },
403
372
{ .name = "debug", .key = 132,
404
373
.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
374
{ .name = NULL }
415
375
};
416
376
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;
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
422
380
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;
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
428
390
}
429
391
}
430
392
}
431
393
break;
432
394
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
434
401
break;
435
402
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;
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
454
420
}
455
421
}
456
422
}
457
423
break;
458
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
459
428
{
460
429
char *envdef = strchr(arg, ':');
461
430
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
431
break;
465
432
}
466
433
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
472
436
}
473
add_environment(getplugin(arg), envdef, true);
474
437
}
475
438
break;
476
439
case 'd': /* --disable */
477
{
440
if(arg != NULL){
478
441
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
481
444
}
445
p->disabled = true;
482
446
}
483
447
break;
484
448
case 'e': /* --enable */
485
{
449
if(arg != NULL){
486
450
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
489
453
}
454
p->disabled = false;
490
455
}
491
456
break;
492
457
case 128: /* --plugin-dir */
493
458
free(plugindir);
494
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
495
463
break;
496
464
case 129: /* --config-file */
497
465
/* This is already done by parse_opt_config_file() */
498
466
break;
499
467
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;
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
506
475
}
507
uid = (uid_t)tmpmax;
508
476
break;
509
477
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;
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
516
485
}
517
gid = (gid_t)tmpmax;
518
486
break;
519
487
case 132: /* --debug */
520
488
debug = true;
521
489
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
490
/*
537
491
* When adding more options before this line, remember to also add a
538
492
* "case" to the "parse_opt_config_file" function below.
541
495
/* Cryptsetup always passes an argument, which is an empty
542
496
string if "none" was specified in /etc/crypttab. So if
543
497
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
547
504
default:
548
505
return ARGP_ERR_UNKNOWN;
549
506
}
550
return errno; /* Set to 0 at start */
507
return 0;
551
508
}
552
509
553
510
/* This option parser is the same as parse_opt() above, except it
554
511
ignores everything but the --config-file option. */
555
512
error_t parse_opt_config_file(int key, char *arg,
556
513
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
514
struct argp_state *state) {
515
switch(key) {
560
516
case 'g': /* --global-options */
561
517
case 'G': /* --global-env */
562
518
case 'o': /* --options-for */
568
524
case 129: /* --config-file */
569
525
free(argfile);
570
526
argfile = strdup(arg);
571
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
572
531
case 130: /* --userid */
573
532
case 131: /* --groupid */
574
533
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
579
536
break;
580
537
default:
581
538
return ARGP_ERR_UNKNOWN;
582
539
}
583
return errno;
540
return 0;
584
541
}
585
542
586
543
struct argp argp = { .options = options,
590
547
591
548
/* Parse using parse_opt_config_file() in order to get the custom
592
549
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;
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
607
554
goto fallback;
608
555
}
609
556
615
562
conffp = fopen(AFILE, "r");
616
563
} else {
617
564
conffp = fopen(argfile, "r");
618
}
565
}
619
566
if(conffp != NULL){
620
567
char *org_line = NULL;
621
568
char *p, *arg, *new_arg, *line;
622
569
size_t size = 0;
623
570
const char whitespace_delims[] = " \r\t\f\v\n";
624
571
const char comment_delim[] = "#";
625
572
626
573
custom_argc = 1;
627
574
custom_argv = malloc(sizeof(char*) * 2);
628
575
if(custom_argv == NULL){
629
576
perror("malloc");
630
exitstatus = EX_OSERR;
577
exitstatus = EXIT_FAILURE;
631
578
goto fallback;
632
579
}
633
580
custom_argv[0] = argv[0];
634
581
custom_argv[1] = NULL;
635
582
636
583
/* for each line in the config file, strip whitespace and ignore
637
584
commented text */
638
585
while(true){
640
587
if(sret == -1){
641
588
break;
642
589
}
643
590
644
591
line = org_line;
645
592
arg = strsep(&line, comment_delim);
646
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
597
new_arg = strdup(p);
651
598
if(new_arg == NULL){
652
599
perror("strdup");
653
exitstatus = EX_OSERR;
600
exitstatus = EXIT_FAILURE;
654
601
free(org_line);
655
602
goto fallback;
656
603
}
660
607
* ((unsigned int) custom_argc + 1));
661
608
if(custom_argv == NULL){
662
609
perror("realloc");
663
exitstatus = EX_OSERR;
610
exitstatus = EXIT_FAILURE;
664
611
free(org_line);
665
612
goto fallback;
666
613
}
667
614
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
669
616
}
670
617
}
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
618
free(org_line);
680
619
} else {
681
620
/* Check for harmful errors and go to fallback. Other errors might
682
621
not affect opening plugins */
683
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
623
perror("fopen");
685
exitstatus = EX_OSERR;
624
exitstatus = EXIT_FAILURE;
686
625
goto fallback;
687
626
}
688
627
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
691
630
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;
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
706
636
goto fallback;
707
637
}
708
638
}
709
639
710
640
/* Parse actual command line arguments, to let them override the
711
641
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;
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
726
646
goto fallback;
727
647
}
728
648
741
661
}
742
662
743
663
/* Strip permissions down to nobody */
664
ret = setuid(uid);
665
if(ret == -1){
666
perror("setuid");
667
}
744
668
setgid(gid);
745
669
if(ret == -1){
746
670
perror("setgid");
747
671
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
686
{
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;
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
796
695
}
797
696
}
798
697
800
699
801
700
/* Read and execute any executable in the plugin directory*/
802
701
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
806
703
807
704
/* All directory entries have been processed */
808
705
if(dirst == NULL){
809
706
if(errno == EBADF){
810
707
perror("readdir");
811
exitstatus = EX_IOERR;
708
exitstatus = EXIT_FAILURE;
812
709
goto fallback;
813
710
}
814
711
break;
844
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
742
size_t suf_len = strlen(*suf);
846
743
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
745
== 0)){
849
746
if(debug){
850
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
756
continue;
860
757
}
861
758
}
862
759
863
760
char *filename;
864
761
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
763
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
765
}
872
766
if(ret < 0){
873
767
perror("asprintf");
874
768
continue;
875
769
}
876
770
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
878
772
if(ret == -1){
879
773
perror("stat");
880
774
free(filename);
881
775
continue;
882
776
}
883
777
884
778
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
780
if(debug){
888
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
782
" with bad type or mode\n", filename);
935
828
}
936
829
937
830
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
939
832
if(ret == -1){
940
833
perror("pipe");
941
exitstatus = EX_OSERR;
834
exitstatus = EXIT_FAILURE;
942
835
goto fallback;
943
836
}
944
837
/* Ask OS to automatic close the pipe on exec */
945
838
ret = set_cloexec_flag(pipefd[0]);
946
839
if(ret < 0){
947
840
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
841
exitstatus = EXIT_FAILURE;
949
842
goto fallback;
950
843
}
951
844
ret = set_cloexec_flag(pipefd[1]);
952
845
if(ret < 0){
953
846
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
847
exitstatus = EXIT_FAILURE;
955
848
goto fallback;
956
849
}
957
850
/* 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));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
852
if(ret < 0){
962
853
perror("sigprocmask");
963
exitstatus = EX_OSERR;
854
exitstatus = EXIT_FAILURE;
964
855
goto fallback;
965
856
}
966
857
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
971
859
if(pid == -1){
972
860
perror("fork");
973
exitstatus = EX_OSERR;
861
exitstatus = EXIT_FAILURE;
974
862
goto fallback;
975
863
}
976
864
if(pid == 0){
978
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
867
if(ret < 0){
980
868
perror("sigaction");
981
_exit(EX_OSERR);
869
_exit(EXIT_FAILURE);
982
870
}
983
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
872
if(ret < 0){
985
873
perror("sigprocmask");
986
_exit(EX_OSERR);
874
_exit(EXIT_FAILURE);
987
875
}
988
876
989
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
878
if(ret == -1){
991
879
perror("dup2");
992
_exit(EX_OSERR);
880
_exit(EXIT_FAILURE);
993
881
}
994
882
995
883
if(dirfd(dir) < 0){
1000
888
if(p->environ[0] == NULL){
1001
889
if(execv(filename, p->argv) < 0){
1002
890
perror("execv");
1003
_exit(EX_OSERR);
891
_exit(EXIT_FAILURE);
1004
892
}
1005
893
} else {
1006
894
if(execve(filename, p->argv, p->environ) < 0){
1007
895
perror("execve");
1008
_exit(EX_OSERR);
896
_exit(EXIT_FAILURE);
1009
897
}
1010
898
}
1011
899
/* no return */
1012
900
}
1013
901
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1016
903
free(filename);
1017
904
plugin *new_plugin = getplugin(dirst->d_name);
1018
905
if(new_plugin == NULL){
1019
906
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
908
if(ret < 0){
1024
909
perror("sigprocmask");
1025
910
}
1026
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1027
912
goto fallback;
1028
913
}
1029
914
1032
917
1033
918
/* Unblock SIGCHLD so signal handler can be run if this process
1034
919
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
921
if(ret < 0){
1039
922
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
923
exitstatus = EXIT_FAILURE;
1041
924
goto fallback;
1042
925
}
1043
926
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
927
FD_SET(new_plugin->fd, &rfds_all);
1046
928
1047
929
if(maxfd < new_plugin->fd){
1048
930
maxfd = new_plugin->fd;
1049
931
}
1050
932
}
1051
933
1052
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1053
935
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
936
1056
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
938
if(p->pid != 0){
1068
949
while(plugin_list){
1069
950
fd_set rfds = rfds_all;
1070
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
952
if(select_ret == -1){
1072
953
perror("select");
1073
exitstatus = EX_OSERR;
954
exitstatus = EXIT_FAILURE;
1074
955
goto fallback;
1075
956
}
1076
957
/* OK, now either a process completed, or something can be read
1077
958
from one of them */
1078
959
for(plugin *proc = plugin_list; proc != NULL;){
1079
960
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
961
if(proc->eof and proc->completed){
1081
962
/* Only accept the plugin output if it exited cleanly */
1082
963
if(not WIFEXITED(proc->status)
1083
964
or WEXITSTATUS(proc->status) != 0){
1084
965
/* Bad exit by plugin */
1085
966
1086
967
if(debug){
1087
968
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1091
971
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)));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1098
976
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1101
979
}
1102
980
}
1103
981
1104
982
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
983
FD_CLR(proc->fd, &rfds_all);
984
1108
985
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
987
if(ret < 0){
1114
988
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
989
exitstatus = EXIT_FAILURE;
1116
990
goto fallback;
1117
991
}
1118
992
1121
995
proc = next_plugin;
1122
996
1123
997
/* 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)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1127
1000
if(ret < 0){
1128
1001
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1002
exitstatus = EXIT_FAILURE;
1130
1003
goto fallback;
1131
1004
}
1132
1005
1143
1016
proc->buffer_length);
1144
1017
if(not bret){
1145
1018
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1019
exitstatus = EXIT_FAILURE;
1147
1020
}
1148
1021
goto fallback;
1149
1022
}
1150
1023
1151
1024
/* 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 */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1026
/* This process had nothing to say at this time */
1156
1027
proc = proc->next;
1157
1028
continue;
1162
1033
+ (size_t) BUFFER_SIZE);
1163
1034
if(proc->buffer == NULL){
1164
1035
perror("malloc");
1165
exitstatus = EX_OSERR;
1036
exitstatus = EXIT_FAILURE;
1166
1037
goto fallback;
1167
1038
}
1168
1039
proc->buffer_size += BUFFER_SIZE;
1169
1040
}
1170
1041
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1175
1044
if(sret < 0){
1176
1045
/* Read error from this process; ignore the error */
1177
1046
proc = proc->next;
1185
1054
}
1186
1055
}
1187
1056
}
1188
1189
1057
1058
1190
1059
fallback:
1191
1060
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1062
/* Fallback if all plugins failed, none are found or an error
1195
1063
occured */
1196
1064
bool bret;
1205
1073
bret = print_out_password(passwordbuffer, len);
1206
1074
if(not bret){
1207
1075
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1076
exitstatus = EXIT_FAILURE;
1209
1077
}
1210
1078
}
1211
1079
1213
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1082
if(ret == -1){
1215
1083
perror("sigaction");
1216
exitstatus = EX_OSERR;
1084
exitstatus = EXIT_FAILURE;
1217
1085
}
1218
1086
1219
1087
if(custom_argv != NULL){
1240
1108
}
1241
1109
1242
1110
/* Wait for any remaining child processes to terminate */
1243
do {
1111
do{
1244
1112
ret = wait(NULL);
1245
1113
} while(ret >= 0);
1246
1114
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0