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- Committer: Björn Påhlsson
- Date: 2009-01-17 12:16:21 UTC
- mfrom: (274 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-20090117121621-06637yub6r1p1t6c
merge
- 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 */
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
118
free(new_plugin);
130
errno = e;
131
119
return NULL;
132
120
}
133
121
}
134
122
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
139
127
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
143
129
if(new_plugin->argv == NULL){
144
int e = errno;
145
130
free(copy_name);
146
131
free(new_plugin);
147
errno = e;
148
132
return NULL;
149
133
}
150
134
new_plugin->argv[0] = copy_name;
151
135
new_plugin->argv[1] = NULL;
152
136
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
156
138
if(new_plugin->environ == NULL){
157
int e = errno;
158
139
free(copy_name);
159
140
free(new_plugin->argv);
160
141
free(new_plugin);
161
errno = e;
162
142
return NULL;
163
143
}
164
144
new_plugin->environ[0] = NULL;
172
152
static bool add_to_char_array(const char *new, char ***array,
173
153
int *len){
174
154
/* 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);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
179
157
/* Malloc check */
180
158
if(*array == NULL){
181
159
return false;
182
160
}
183
161
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
188
163
if(copy == NULL){
189
164
return false;
190
165
}
216
191
if(strncmp(*e, def, namelen + 1) == 0){
217
192
/* It already exists */
218
193
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
223
195
if(new == NULL){
224
196
return false;
225
197
}
235
207
/*
236
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
209
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
211
*/
240
212
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
242
214
/* If reading the flags failed, return error indication now. */
243
215
if(ret < 0){
244
216
return ret;
245
217
}
246
218
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
220
}
250
221
251
222
252
223
/* Mark processes as completed when they exit, and save their exit
253
224
status. */
254
225
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
226
while(true){
257
227
plugin *proc = plugin_list;
258
228
int status;
262
232
break;
263
233
}
264
234
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
235
if(errno != ECHILD){
236
perror("waitpid");
268
237
}
269
perror("waitpid");
238
/* No child processes */
239
break;
270
240
}
271
241
272
242
/* A child exited, find it in process_list */
278
248
continue;
279
249
}
280
250
proc->status = status;
281
proc->completed = 1;
251
proc->completed = true;
282
252
}
283
errno = old_errno;
284
253
}
285
254
286
255
/* Prints out a password to stdout */
308
277
}
309
278
free(plugin_node->environ);
310
279
free(plugin_node->buffer);
311
280
312
281
/* Removes the plugin from the singly-linked list */
313
282
if(plugin_node == plugin_list){
314
283
/* First one - simple */
341
310
struct dirent *dirst;
342
311
struct stat st;
343
312
fd_set rfds_all;
344
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
345
314
ssize_t sret;
315
intmax_t tmpmax;
346
316
uid_t uid = 65534;
347
317
gid_t gid = 65534;
348
318
bool debug = false;
358
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
329
if(ret == -1){
360
330
perror("sigaddset");
361
exitstatus = EX_OSERR;
331
exitstatus = EXIT_FAILURE;
362
332
goto fallback;
363
333
}
364
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
335
if(ret == -1){
366
336
perror("sigaction");
367
exitstatus = EX_OSERR;
337
exitstatus = EXIT_FAILURE;
368
338
goto fallback;
369
339
}
370
340
402
372
.doc = "Group ID the plugins will run as", .group = 3 },
403
373
{ .name = "debug", .key = 132,
404
374
.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
375
{ .name = NULL }
415
376
};
416
377
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
422
381
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;
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
428
391
}
429
392
}
430
393
}
431
394
break;
432
395
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
434
402
break;
435
403
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;
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
454
421
}
455
422
}
456
423
}
457
424
break;
458
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
459
429
{
460
430
char *envdef = strchr(arg, ':');
461
431
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
432
break;
465
433
}
466
434
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
472
437
}
473
add_environment(getplugin(arg), envdef, true);
474
438
}
475
439
break;
476
440
case 'd': /* --disable */
477
{
441
if(arg != NULL){
478
442
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
481
445
}
446
p->disabled = true;
482
447
}
483
448
break;
484
449
case 'e': /* --enable */
485
{
450
if(arg != NULL){
486
451
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
489
454
}
455
p->disabled = false;
490
456
}
491
457
break;
492
458
case 128: /* --plugin-dir */
493
459
free(plugindir);
494
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
495
464
break;
496
465
case 129: /* --config-file */
497
466
/* This is already done by parse_opt_config_file() */
498
467
break;
499
468
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;
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
506
476
}
507
uid = (uid_t)tmpmax;
508
477
break;
509
478
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;
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
516
486
}
517
gid = (gid_t)tmpmax;
518
487
break;
519
488
case 132: /* --debug */
520
489
debug = true;
521
490
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
491
/*
537
492
* When adding more options before this line, remember to also add a
538
493
* "case" to the "parse_opt_config_file" function below.
541
496
/* Cryptsetup always passes an argument, which is an empty
542
497
string if "none" was specified in /etc/crypttab. So if
543
498
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
547
505
default:
548
506
return ARGP_ERR_UNKNOWN;
549
507
}
550
return errno; /* Set to 0 at start */
508
return 0;
551
509
}
552
510
553
511
/* This option parser is the same as parse_opt() above, except it
554
512
ignores everything but the --config-file option. */
555
513
error_t parse_opt_config_file(int key, char *arg,
556
514
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
515
struct argp_state *state) {
516
switch(key) {
560
517
case 'g': /* --global-options */
561
518
case 'G': /* --global-env */
562
519
case 'o': /* --options-for */
568
525
case 129: /* --config-file */
569
526
free(argfile);
570
527
argfile = strdup(arg);
571
break;
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
572
532
case 130: /* --userid */
573
533
case 131: /* --groupid */
574
534
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
579
537
break;
580
538
default:
581
539
return ARGP_ERR_UNKNOWN;
582
540
}
583
return errno;
541
return 0;
584
542
}
585
543
586
544
struct argp argp = { .options = options,
590
548
591
549
/* Parse using parse_opt_config_file() in order to get the custom
592
550
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;
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
607
555
goto fallback;
608
556
}
609
557
615
563
conffp = fopen(AFILE, "r");
616
564
} else {
617
565
conffp = fopen(argfile, "r");
618
}
566
}
619
567
if(conffp != NULL){
620
568
char *org_line = NULL;
621
569
char *p, *arg, *new_arg, *line;
622
570
size_t size = 0;
623
571
const char whitespace_delims[] = " \r\t\f\v\n";
624
572
const char comment_delim[] = "#";
625
573
626
574
custom_argc = 1;
627
575
custom_argv = malloc(sizeof(char*) * 2);
628
576
if(custom_argv == NULL){
629
577
perror("malloc");
630
exitstatus = EX_OSERR;
578
exitstatus = EXIT_FAILURE;
631
579
goto fallback;
632
580
}
633
581
custom_argv[0] = argv[0];
634
582
custom_argv[1] = NULL;
635
583
636
584
/* for each line in the config file, strip whitespace and ignore
637
585
commented text */
638
586
while(true){
640
588
if(sret == -1){
641
589
break;
642
590
}
643
591
644
592
line = org_line;
645
593
arg = strsep(&line, comment_delim);
646
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
598
new_arg = strdup(p);
651
599
if(new_arg == NULL){
652
600
perror("strdup");
653
exitstatus = EX_OSERR;
601
exitstatus = EXIT_FAILURE;
654
602
free(org_line);
655
603
goto fallback;
656
604
}
660
608
* ((unsigned int) custom_argc + 1));
661
609
if(custom_argv == NULL){
662
610
perror("realloc");
663
exitstatus = EX_OSERR;
611
exitstatus = EXIT_FAILURE;
664
612
free(org_line);
665
613
goto fallback;
666
614
}
667
615
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
616
custom_argv[custom_argc] = NULL;
669
617
}
670
618
}
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
619
free(org_line);
680
620
} else {
681
621
/* Check for harmful errors and go to fallback. Other errors might
682
622
not affect opening plugins */
683
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
624
perror("fopen");
685
exitstatus = EX_IOERR;
625
exitstatus = EXIT_FAILURE;
686
626
goto fallback;
687
627
}
688
628
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
691
631
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;
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
706
637
goto fallback;
707
638
}
708
639
}
709
640
710
641
/* Parse actual command line arguments, to let them override the
711
642
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;
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
726
647
goto fallback;
727
648
}
728
649
741
662
}
742
663
743
664
/* Strip permissions down to nobody */
665
ret = setuid(uid);
666
if(ret == -1){
667
perror("setuid");
668
}
744
669
setgid(gid);
745
670
if(ret == -1){
746
671
perror("setgid");
747
672
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
673
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
680
if(dir == NULL){
681
perror("Could not open plugin dir");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
685
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
687
{
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;
688
int dir_fd = dirfd(dir);
689
if(dir_fd >= 0){
690
ret = set_cloexec_flag(dir_fd);
691
if(ret < 0){
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
695
}
796
696
}
797
697
}
798
698
800
700
801
701
/* Read and execute any executable in the plugin directory*/
802
702
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
703
dirst = readdir(dir);
806
704
807
705
/* All directory entries have been processed */
808
706
if(dirst == NULL){
809
707
if(errno == EBADF){
810
708
perror("readdir");
811
exitstatus = EX_IOERR;
709
exitstatus = EXIT_FAILURE;
812
710
goto fallback;
813
711
}
814
712
break;
859
757
continue;
860
758
}
861
759
}
862
760
863
761
char *filename;
864
762
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
764
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
766
}
872
767
if(ret < 0){
873
768
perror("asprintf");
874
769
continue;
875
770
}
876
771
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
ret = stat(filename, &st);
878
773
if(ret == -1){
879
774
perror("stat");
880
775
free(filename);
881
776
continue;
882
777
}
883
778
884
779
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
781
if(debug){
888
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
783
" with bad type or mode\n", filename);
935
829
}
936
830
937
831
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
ret = pipe(pipefd);
939
833
if(ret == -1){
940
834
perror("pipe");
941
exitstatus = EX_OSERR;
835
exitstatus = EXIT_FAILURE;
942
836
goto fallback;
943
837
}
944
838
/* Ask OS to automatic close the pipe on exec */
945
839
ret = set_cloexec_flag(pipefd[0]);
946
840
if(ret < 0){
947
841
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
842
exitstatus = EXIT_FAILURE;
949
843
goto fallback;
950
844
}
951
845
ret = set_cloexec_flag(pipefd[1]);
952
846
if(ret < 0){
953
847
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
848
exitstatus = EXIT_FAILURE;
955
849
goto fallback;
956
850
}
957
851
/* 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));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
853
if(ret < 0){
962
854
perror("sigprocmask");
963
exitstatus = EX_OSERR;
855
exitstatus = EXIT_FAILURE;
964
856
goto fallback;
965
857
}
966
858
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
859
pid_t pid = fork();
971
860
if(pid == -1){
972
861
perror("fork");
973
exitstatus = EX_OSERR;
862
exitstatus = EXIT_FAILURE;
974
863
goto fallback;
975
864
}
976
865
if(pid == 0){
978
867
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
868
if(ret < 0){
980
869
perror("sigaction");
981
_exit(EX_OSERR);
870
_exit(EXIT_FAILURE);
982
871
}
983
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
873
if(ret < 0){
985
874
perror("sigprocmask");
986
_exit(EX_OSERR);
875
_exit(EXIT_FAILURE);
987
876
}
988
877
989
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
879
if(ret == -1){
991
880
perror("dup2");
992
_exit(EX_OSERR);
881
_exit(EXIT_FAILURE);
993
882
}
994
883
995
884
if(dirfd(dir) < 0){
1000
889
if(p->environ[0] == NULL){
1001
890
if(execv(filename, p->argv) < 0){
1002
891
perror("execv");
1003
_exit(EX_OSERR);
892
_exit(EXIT_FAILURE);
1004
893
}
1005
894
} else {
1006
895
if(execve(filename, p->argv, p->environ) < 0){
1007
896
perror("execve");
1008
_exit(EX_OSERR);
897
_exit(EXIT_FAILURE);
1009
898
}
1010
899
}
1011
900
/* no return */
1012
901
}
1013
902
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
903
close(pipefd[1]); /* Close unused write end of pipe */
1016
904
free(filename);
1017
905
plugin *new_plugin = getplugin(dirst->d_name);
1018
906
if(new_plugin == NULL){
1019
907
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
909
if(ret < 0){
1024
910
perror("sigprocmask");
1025
911
}
1026
exitstatus = EX_OSERR;
912
exitstatus = EXIT_FAILURE;
1027
913
goto fallback;
1028
914
}
1029
915
1032
918
1033
919
/* Unblock SIGCHLD so signal handler can be run if this process
1034
920
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
922
if(ret < 0){
1039
923
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
924
exitstatus = EXIT_FAILURE;
1041
925
goto fallback;
1042
926
}
1043
927
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
928
FD_SET(new_plugin->fd, &rfds_all);
1046
929
1047
930
if(maxfd < new_plugin->fd){
1048
931
maxfd = new_plugin->fd;
1049
932
}
1050
933
}
1051
934
1052
TEMP_FAILURE_RETRY(closedir(dir));
935
closedir(dir);
1053
936
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
937
1056
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
939
if(p->pid != 0){
1068
950
while(plugin_list){
1069
951
fd_set rfds = rfds_all;
1070
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
953
if(select_ret == -1){
1072
954
perror("select");
1073
exitstatus = EX_OSERR;
955
exitstatus = EXIT_FAILURE;
1074
956
goto fallback;
1075
957
}
1076
958
/* OK, now either a process completed, or something can be read
1077
959
from one of them */
1078
960
for(plugin *proc = plugin_list; proc != NULL;){
1079
961
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
962
if(proc->eof and proc->completed){
1081
963
/* Only accept the plugin output if it exited cleanly */
1082
964
if(not WIFEXITED(proc->status)
1083
965
or WEXITSTATUS(proc->status) != 0){
1084
966
/* Bad exit by plugin */
1085
967
1086
968
if(debug){
1087
969
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1091
972
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)));
973
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
1098
977
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1101
980
}
1102
981
}
1103
982
1104
983
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
984
FD_CLR(proc->fd, &rfds_all);
985
1108
986
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
988
if(ret < 0){
1114
989
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
990
exitstatus = EXIT_FAILURE;
1116
991
goto fallback;
1117
992
}
1118
993
1121
996
proc = next_plugin;
1122
997
1123
998
/* 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)));
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1127
1001
if(ret < 0){
1128
1002
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1003
exitstatus = EXIT_FAILURE;
1130
1004
goto fallback;
1131
1005
}
1132
1006
1143
1017
proc->buffer_length);
1144
1018
if(not bret){
1145
1019
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1020
exitstatus = EXIT_FAILURE;
1147
1021
}
1148
1022
goto fallback;
1149
1023
}
1150
1024
1151
1025
/* 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 */
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1027
/* This process had nothing to say at this time */
1156
1028
proc = proc->next;
1157
1029
continue;
1162
1034
+ (size_t) BUFFER_SIZE);
1163
1035
if(proc->buffer == NULL){
1164
1036
perror("malloc");
1165
exitstatus = EX_OSERR;
1037
exitstatus = EXIT_FAILURE;
1166
1038
goto fallback;
1167
1039
}
1168
1040
proc->buffer_size += BUFFER_SIZE;
1169
1041
}
1170
1042
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1175
1045
if(sret < 0){
1176
1046
/* Read error from this process; ignore the error */
1177
1047
proc = proc->next;
1185
1055
}
1186
1056
}
1187
1057
}
1188
1189
1058
1059
1190
1060
fallback:
1191
1061
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1063
/* Fallback if all plugins failed, none are found or an error
1195
1064
occured */
1196
1065
bool bret;
1205
1074
bret = print_out_password(passwordbuffer, len);
1206
1075
if(not bret){
1207
1076
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1077
exitstatus = EXIT_FAILURE;
1209
1078
}
1210
1079
}
1211
1080
1213
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1083
if(ret == -1){
1215
1084
perror("sigaction");
1216
exitstatus = EX_OSERR;
1085
exitstatus = EXIT_FAILURE;
1217
1086
}
1218
1087
1219
1088
if(custom_argv != NULL){
1240
1109
}
1241
1110
1242
1111
/* Wait for any remaining child processes to terminate */
1243
do {
1112
do{
1244
1113
ret = wait(NULL);
1245
1114
} while(ret >= 0);
1246
1115
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0