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- Committer: Björn Påhlsson
- Date: 2010-09-01 18:03:03 UTC
- mto: (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 421.
- Revision ID: belorn@fukt.bsnet.se-20100901180303-u47edb73fczu56ob
bug fixes that prevent problems when runing server as root
- files added:
- dbus-mandos.conf
- 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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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 */
68
73
69
74
#define BUFFER_SIZE 256
70
75
81
86
char **environ;
82
87
int envc;
83
88
bool disabled;
84
89
85
90
/* Variables used for running processes*/
86
91
pid_t pid;
87
92
int fd;
89
94
size_t buffer_size;
90
95
size_t buffer_length;
91
96
bool eof;
92
volatile bool completed;
93
volatile int status;
97
volatile sig_atomic_t completed;
98
int status;
94
99
struct plugin *next;
95
100
} plugin;
96
101
99
104
/* Gets an existing plugin based on name,
100
105
or if none is found, creates a new one */
101
106
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
107
/* Check for existing plugin with that name */
103
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
109
if((p->name == name)
105
110
or (p->name and name and (strcmp(p->name, name) == 0))){
107
112
}
108
113
}
109
114
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
111
119
if(new_plugin == NULL){
112
120
return NULL;
113
121
}
114
122
char *copy_name = NULL;
115
123
if(name != NULL){
116
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
117
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
118
131
return NULL;
119
132
}
120
133
}
121
134
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
126
139
127
new_plugin->argv = malloc(sizeof(char *) * 2);
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
128
143
if(new_plugin->argv == NULL){
144
int e = errno;
129
145
free(copy_name);
130
146
free(new_plugin);
147
errno = e;
131
148
return NULL;
132
149
}
133
150
new_plugin->argv[0] = copy_name;
134
151
new_plugin->argv[1] = NULL;
135
152
136
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
156
if(new_plugin->environ == NULL){
157
int e = errno;
138
158
free(copy_name);
139
159
free(new_plugin->argv);
140
160
free(new_plugin);
161
errno = e;
141
162
return NULL;
142
163
}
143
164
new_plugin->environ[0] = NULL;
151
172
static bool add_to_char_array(const char *new, char ***array,
152
173
int *len){
153
174
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
156
179
/* Malloc check */
157
180
if(*array == NULL){
158
181
return false;
159
182
}
160
183
/* Make a copy of the new string */
161
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
188
if(copy == NULL){
163
189
return false;
164
190
}
190
216
if(strncmp(*e, def, namelen + 1) == 0){
191
217
/* It already exists */
192
218
if(replace){
193
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);
194
223
if(new == NULL){
195
224
return false;
196
225
}
206
235
/*
207
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
237
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
239
*/
211
240
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
242
/* If reading the flags failed, return error indication now. */
214
243
if(ret < 0){
215
244
return ret;
216
245
}
217
246
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
249
}
220
250
221
251
222
252
/* Mark processes as completed when they exit, and save their exit
223
253
status. */
224
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
225
256
while(true){
226
257
plugin *proc = plugin_list;
227
258
int status;
231
262
break;
232
263
}
233
264
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
236
268
}
237
/* No child processes */
238
break;
269
perror("waitpid");
239
270
}
240
271
241
272
/* A child exited, find it in process_list */
247
278
continue;
248
279
}
249
280
proc->status = status;
250
proc->completed = true;
281
proc->completed = 1;
251
282
}
283
errno = old_errno;
252
284
}
253
285
254
286
/* Prints out a password to stdout */
276
308
}
277
309
free(plugin_node->environ);
278
310
free(plugin_node->buffer);
279
311
280
312
/* Removes the plugin from the singly-linked list */
281
313
if(plugin_node == plugin_list){
282
314
/* First one - simple */
309
341
struct dirent *dirst;
310
342
struct stat st;
311
343
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
344
int ret, maxfd = 0;
313
345
ssize_t sret;
314
intmax_t tmpmax;
315
346
uid_t uid = 65534;
316
347
gid_t gid = 65534;
317
348
bool debug = false;
327
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
359
if(ret == -1){
329
360
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
331
362
goto fallback;
332
363
}
333
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
365
if(ret == -1){
335
366
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
337
368
goto fallback;
338
369
}
339
370
371
402
.doc = "Group ID the plugins will run as", .group = 3 },
372
403
{ .name = "debug", .key = 132,
373
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 },
374
414
{ .name = NULL }
375
415
};
376
416
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
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;
380
422
case 'g': /* --global-options */
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;
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
390
428
}
391
429
}
392
430
}
393
431
break;
394
432
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
433
add_environment(getplugin(NULL), arg, true);
401
434
break;
402
435
case 'o': /* --options-for */
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;
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;
420
454
}
421
455
}
422
456
}
423
457
break;
424
458
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
459
{
429
460
char *envdef = strchr(arg, ':');
430
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
431
464
break;
432
465
}
433
466
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
436
472
}
473
add_environment(getplugin(arg), envdef, true);
437
474
}
438
475
break;
439
476
case 'd': /* --disable */
440
if(arg != NULL){
477
{
441
478
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
444
481
}
445
p->disabled = true;
446
482
}
447
483
break;
448
484
case 'e': /* --enable */
449
if(arg != NULL){
485
{
450
486
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
453
489
}
454
p->disabled = false;
455
490
}
456
491
break;
457
492
case 128: /* --plugin-dir */
458
493
free(plugindir);
459
494
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
495
break;
464
496
case 129: /* --config-file */
465
497
/* This is already done by parse_opt_config_file() */
466
498
break;
467
499
case 130: /* --userid */
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;
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;
475
506
}
507
uid = (uid_t)tmpmax;
476
508
break;
477
509
case 131: /* --groupid */
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;
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;
485
516
}
517
gid = (gid_t)tmpmax;
486
518
break;
487
519
case 132: /* --debug */
488
520
debug = true;
489
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;
490
536
/*
491
537
* When adding more options before this line, remember to also add a
492
538
* "case" to the "parse_opt_config_file" function below.
495
541
/* Cryptsetup always passes an argument, which is an empty
496
542
string if "none" was specified in /etc/crypttab. So if
497
543
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
544
if(arg[0] == '\0'){
545
break;
500
546
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
547
default:
505
548
return ARGP_ERR_UNKNOWN;
506
549
}
507
return 0;
550
return errno; /* Set to 0 at start */
508
551
}
509
552
510
553
/* This option parser is the same as parse_opt() above, except it
511
554
ignores everything but the --config-file option. */
512
555
error_t parse_opt_config_file(int key, char *arg,
513
556
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
516
560
case 'g': /* --global-options */
517
561
case 'G': /* --global-env */
518
562
case 'o': /* --options-for */
524
568
case 129: /* --config-file */
525
569
free(argfile);
526
570
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
571
break;
531
572
case 130: /* --userid */
532
573
case 131: /* --groupid */
533
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
534
578
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
579
break;
537
580
default:
538
581
return ARGP_ERR_UNKNOWN;
539
582
}
540
return 0;
583
return errno;
541
584
}
542
585
543
586
struct argp argp = { .options = options,
547
590
548
591
/* Parse using parse_opt_config_file() in order to get the custom
549
592
config file location, if any. */
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;
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;
554
607
goto fallback;
555
608
}
556
609
562
615
conffp = fopen(AFILE, "r");
563
616
} else {
564
617
conffp = fopen(argfile, "r");
565
}
618
}
566
619
if(conffp != NULL){
567
620
char *org_line = NULL;
568
621
char *p, *arg, *new_arg, *line;
569
622
size_t size = 0;
570
623
const char whitespace_delims[] = " \r\t\f\v\n";
571
624
const char comment_delim[] = "#";
572
625
573
626
custom_argc = 1;
574
627
custom_argv = malloc(sizeof(char*) * 2);
575
628
if(custom_argv == NULL){
576
629
perror("malloc");
577
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
578
631
goto fallback;
579
632
}
580
633
custom_argv[0] = argv[0];
581
634
custom_argv[1] = NULL;
582
635
583
636
/* for each line in the config file, strip whitespace and ignore
584
637
commented text */
585
638
while(true){
587
640
if(sret == -1){
588
641
break;
589
642
}
590
643
591
644
line = org_line;
592
645
arg = strsep(&line, comment_delim);
593
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
650
new_arg = strdup(p);
598
651
if(new_arg == NULL){
599
652
perror("strdup");
600
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
601
654
free(org_line);
602
655
goto fallback;
603
656
}
607
660
* ((unsigned int) custom_argc + 1));
608
661
if(custom_argv == NULL){
609
662
perror("realloc");
610
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
611
664
free(org_line);
612
665
goto fallback;
613
666
}
614
667
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
616
669
}
617
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
}
618
679
free(org_line);
619
680
} else {
620
681
/* Check for harmful errors and go to fallback. Other errors might
621
682
not affect opening plugins */
622
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
684
perror("fopen");
624
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_OSERR;
625
686
goto fallback;
626
687
}
627
688
}
628
/* If there was any arguments from configuration file,
629
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 */
630
691
if(custom_argv != NULL){
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;
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;
636
706
goto fallback;
637
707
}
638
708
}
639
709
640
710
/* Parse actual command line arguments, to let them override the
641
711
config file */
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;
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;
646
726
goto fallback;
647
727
}
648
728
661
741
}
662
742
663
743
/* Strip permissions down to nobody */
744
setgid(gid);
745
if(ret == -1){
746
perror("setgid");
747
}
664
748
ret = setuid(uid);
665
749
if(ret == -1){
666
750
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
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 */
751
}
752
753
/* Open plugin directory with close_on_exec flag */
686
754
{
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
}
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;
695
796
}
696
797
}
697
798
699
800
700
801
/* Read and execute any executable in the plugin directory*/
701
802
while(true){
702
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
703
806
704
807
/* All directory entries have been processed */
705
808
if(dirst == NULL){
706
809
if(errno == EBADF){
707
810
perror("readdir");
708
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
709
812
goto fallback;
710
813
}
711
814
break;
741
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
845
size_t suf_len = strlen(*suf);
743
846
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
745
848
== 0)){
746
849
if(debug){
747
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
756
859
continue;
757
860
}
758
861
}
759
862
760
863
char *filename;
761
864
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
763
867
} else {
764
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));
765
871
}
766
872
if(ret < 0){
767
873
perror("asprintf");
768
874
continue;
769
875
}
770
876
771
ret = stat(filename, &st);
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
878
if(ret == -1){
773
879
perror("stat");
774
880
free(filename);
775
881
continue;
776
882
}
777
883
778
884
/* Ignore non-executable files */
779
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)){
780
887
if(debug){
781
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
889
" with bad type or mode\n", filename);
828
935
}
829
936
830
937
int pipefd[2];
831
ret = pipe(pipefd);
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
939
if(ret == -1){
833
940
perror("pipe");
834
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
835
942
goto fallback;
836
943
}
837
944
/* Ask OS to automatic close the pipe on exec */
838
945
ret = set_cloexec_flag(pipefd[0]);
839
946
if(ret < 0){
840
947
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
842
949
goto fallback;
843
950
}
844
951
ret = set_cloexec_flag(pipefd[1]);
845
952
if(ret < 0){
846
953
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
848
955
goto fallback;
849
956
}
850
957
/* Block SIGCHLD until process is safely in process list */
851
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));
852
961
if(ret < 0){
853
962
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
855
964
goto fallback;
856
965
}
857
966
/* Starting a new process to be watched */
858
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
859
971
if(pid == -1){
860
972
perror("fork");
861
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
862
974
goto fallback;
863
975
}
864
976
if(pid == 0){
866
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
979
if(ret < 0){
868
980
perror("sigaction");
869
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
870
982
}
871
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
984
if(ret < 0){
873
985
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
875
987
}
876
988
877
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
990
if(ret == -1){
879
991
perror("dup2");
880
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
881
993
}
882
994
883
995
if(dirfd(dir) < 0){
888
1000
if(p->environ[0] == NULL){
889
1001
if(execv(filename, p->argv) < 0){
890
1002
perror("execv");
891
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
892
1004
}
893
1005
} else {
894
1006
if(execve(filename, p->argv, p->environ) < 0){
895
1007
perror("execve");
896
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
897
1009
}
898
1010
}
899
1011
/* no return */
900
1012
}
901
1013
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
903
1016
free(filename);
904
1017
plugin *new_plugin = getplugin(dirst->d_name);
905
1018
if(new_plugin == NULL){
906
1019
perror("getplugin");
907
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)));
908
1023
if(ret < 0){
909
1024
perror("sigprocmask");
910
1025
}
911
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
912
1027
goto fallback;
913
1028
}
914
1029
917
1032
918
1033
/* Unblock SIGCHLD so signal handler can be run if this process
919
1034
has already completed */
920
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));
921
1038
if(ret < 0){
922
1039
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
924
1041
goto fallback;
925
1042
}
926
1043
927
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
928
1046
929
1047
if(maxfd < new_plugin->fd){
930
1048
maxfd = new_plugin->fd;
931
1049
}
932
1050
}
933
1051
934
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
935
1053
dir = NULL;
1054
free_plugin(getplugin(NULL));
936
1055
937
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1057
if(p->pid != 0){
949
1068
while(plugin_list){
950
1069
fd_set rfds = rfds_all;
951
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
953
1072
perror("select");
954
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
955
1074
goto fallback;
956
1075
}
957
1076
/* OK, now either a process completed, or something can be read
958
1077
from one of them */
959
1078
for(plugin *proc = plugin_list; proc != NULL;){
960
1079
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1080
if(proc->completed and proc->eof){
962
1081
/* Only accept the plugin output if it exited cleanly */
963
1082
if(not WIFEXITED(proc->status)
964
1083
or WEXITSTATUS(proc->status) != 0){
965
1084
/* Bad exit by plugin */
966
1085
967
1086
if(debug){
968
1087
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
971
1091
WEXITSTATUS(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));
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)));
976
1098
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
979
1101
}
980
1102
}
981
1103
982
1104
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
985
1108
/* Block signal while modifying process_list */
986
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));
987
1113
if(ret < 0){
988
1114
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
990
1116
goto fallback;
991
1117
}
992
1118
995
1121
proc = next_plugin;
996
1122
997
1123
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1000
1127
if(ret < 0){
1001
1128
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
1003
1130
goto fallback;
1004
1131
}
1005
1132
1016
1143
proc->buffer_length);
1017
1144
if(not bret){
1018
1145
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1020
1147
}
1021
1148
goto fallback;
1022
1149
}
1023
1150
1024
1151
/* This process has not completed. Does it have any output? */
1025
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 */
1026
1155
/* This process had nothing to say at this time */
1027
1156
proc = proc->next;
1028
1157
continue;
1033
1162
+ (size_t) BUFFER_SIZE);
1034
1163
if(proc->buffer == NULL){
1035
1164
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1037
1166
goto fallback;
1038
1167
}
1039
1168
proc->buffer_size += BUFFER_SIZE;
1040
1169
}
1041
1170
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1044
1175
if(sret < 0){
1045
1176
/* Read error from this process; ignore the error */
1046
1177
proc = proc->next;
1054
1185
}
1055
1186
}
1056
1187
}
1057
1058
1188
1189
1059
1190
fallback:
1060
1191
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1062
1194
/* Fallback if all plugins failed, none are found or an error
1063
1195
occured */
1064
1196
bool bret;
1073
1205
bret = print_out_password(passwordbuffer, len);
1074
1206
if(not bret){
1075
1207
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1077
1209
}
1078
1210
}
1079
1211
1081
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1214
if(ret == -1){
1083
1215
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1085
1217
}
1086
1218
1087
1219
if(custom_argv != NULL){
1108
1240
}
1109
1241
1110
1242
/* Wait for any remaining child processes to terminate */
1111
do{
1243
do {
1112
1244
ret = wait(NULL);
1113
1245
} while(ret >= 0);
1114
1246
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0