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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:21:53 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106222153-3b43cfdjyvz1032y
Tags: version-1.0.3-2
* debian/changelog (1.0.3-2): New entry.
- 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() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
67
74
68
#define BUFFER_SIZE 256
75
69
86
80
char **environ;
87
81
int envc;
88
82
bool disabled;
89
83
90
84
/* Variables used for running processes*/
91
85
pid_t pid;
92
86
int fd;
94
88
size_t buffer_size;
95
89
size_t buffer_length;
96
90
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
91
volatile bool completed;
92
volatile int status;
99
93
struct plugin *next;
100
94
} plugin;
101
95
104
98
/* Gets an existing plugin based on name,
105
99
or if none is found, creates a new one */
106
100
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
111
105
return p;
112
106
}
113
107
}
114
108
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
120
111
return NULL;
121
112
}
122
113
char *copy_name = NULL;
123
114
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
127
116
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
117
return NULL;
132
118
}
133
119
}
134
120
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
139
125
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
145
128
free(copy_name);
146
129
free(new_plugin);
147
errno = e;
148
130
return NULL;
149
131
}
150
132
new_plugin->argv[0] = copy_name;
151
133
new_plugin->argv[1] = NULL;
152
134
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
156
136
if(new_plugin->environ == NULL){
157
int e = errno;
158
137
free(copy_name);
159
138
free(new_plugin->argv);
160
139
free(new_plugin);
161
errno = e;
162
140
return NULL;
163
141
}
164
142
new_plugin->environ[0] = NULL;
172
150
static bool add_to_char_array(const char *new, char ***array,
173
151
int *len){
174
152
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
179
155
/* Malloc check */
180
156
if(*array == NULL){
181
157
return false;
182
158
}
183
159
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
188
161
if(copy == NULL){
189
162
return false;
190
163
}
216
189
if(strncmp(*e, def, namelen + 1) == 0){
217
190
/* It already exists */
218
191
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
223
193
if(new == NULL){
224
194
return false;
225
195
}
235
205
/*
236
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
207
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
209
*/
240
210
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
242
212
/* If reading the flags failed, return error indication now. */
243
213
if(ret < 0){
244
214
return ret;
245
215
}
246
216
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
218
}
250
219
251
220
252
221
/* Mark processes as completed when they exit, and save their exit
253
222
status. */
254
223
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
224
while(true){
257
225
plugin *proc = plugin_list;
258
226
int status;
262
230
break;
263
231
}
264
232
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
233
if (errno != ECHILD){
234
perror("waitpid");
268
235
}
269
perror("waitpid");
236
/* No child processes */
237
break;
270
238
}
271
239
272
240
/* A child exited, find it in process_list */
278
246
continue;
279
247
}
280
248
proc->status = status;
281
proc->completed = 1;
249
proc->completed = true;
282
250
}
283
errno = old_errno;
284
251
}
285
252
286
253
/* Prints out a password to stdout */
308
275
}
309
276
free(plugin_node->environ);
310
277
free(plugin_node->buffer);
311
278
312
279
/* Removes the plugin from the singly-linked list */
313
280
if(plugin_node == plugin_list){
314
281
/* First one - simple */
342
309
struct stat st;
343
310
fd_set rfds_all;
344
311
int ret, maxfd = 0;
345
ssize_t sret;
346
312
uid_t uid = 65534;
347
313
gid_t gid = 65534;
348
314
bool debug = false;
358
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
325
if(ret == -1){
360
326
perror("sigaddset");
361
exitstatus = EX_OSERR;
327
exitstatus = EXIT_FAILURE;
362
328
goto fallback;
363
329
}
364
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
331
if(ret == -1){
366
332
perror("sigaction");
367
exitstatus = EX_OSERR;
333
exitstatus = EXIT_FAILURE;
368
334
goto fallback;
369
335
}
370
336
402
368
.doc = "Group ID the plugins will run as", .group = 3 },
403
369
{ .name = "debug", .key = 132,
404
370
.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
371
{ .name = NULL }
415
372
};
416
373
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;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
422
377
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;
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
428
387
}
429
388
}
430
389
}
431
390
break;
432
391
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
397
}
434
398
break;
435
399
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;
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
454
417
}
455
418
}
456
419
}
457
420
break;
458
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
459
425
{
460
426
char *envdef = strchr(arg, ':');
461
427
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
428
break;
465
429
}
466
430
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
472
433
}
473
add_environment(getplugin(arg), envdef, true);
474
434
}
475
435
break;
476
436
case 'd': /* --disable */
477
{
437
if (arg != NULL){
478
438
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
481
441
}
442
p->disabled = true;
482
443
}
483
444
break;
484
445
case 'e': /* --enable */
485
{
446
if (arg != NULL){
486
447
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
489
450
}
451
p->disabled = false;
490
452
}
491
453
break;
492
454
case 128: /* --plugin-dir */
493
455
free(plugindir);
494
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
495
460
break;
496
461
case 129: /* --config-file */
497
462
/* This is already done by parse_opt_config_file() */
498
463
break;
499
464
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;
506
}
507
uid = (uid_t)tmpmax;
465
uid = (uid_t)strtol(arg, NULL, 10);
508
466
break;
509
467
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;
516
}
517
gid = (gid_t)tmpmax;
468
gid = (gid_t)strtol(arg, NULL, 10);
518
469
break;
519
470
case 132: /* --debug */
520
471
debug = true;
521
472
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
473
case ARGP_KEY_ARG:
541
474
/* Cryptsetup always passes an argument, which is an empty
542
475
string if "none" was specified in /etc/crypttab. So if
543
476
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
547
483
default:
548
484
return ARGP_ERR_UNKNOWN;
549
485
}
550
return errno; /* Set to 0 at start */
486
return 0;
551
487
}
552
488
553
489
/* This option parser is the same as parse_opt() above, except it
554
490
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
560
495
case 'g': /* --global-options */
561
496
case 'G': /* --global-env */
562
497
case 'o': /* --options-for */
568
503
case 129: /* --config-file */
569
504
free(argfile);
570
505
argfile = strdup(arg);
571
break;
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
572
510
case 130: /* --userid */
573
511
case 131: /* --groupid */
574
512
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
579
515
break;
580
516
default:
581
517
return ARGP_ERR_UNKNOWN;
582
518
}
583
return errno;
519
return 0;
584
520
}
585
521
586
522
struct argp argp = { .options = options,
588
524
.args_doc = "",
589
525
.doc = "Mandos plugin runner -- Run plugins" };
590
526
591
/* Parse using parse_opt_config_file() in order to get the custom
527
/* Parse using the parse_opt_config_file in order to get the custom
592
528
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;
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
607
533
goto fallback;
608
534
}
609
535
611
537
argp.parser = parse_opt;
612
538
613
539
/* Open the configfile if available */
614
if(argfile == NULL){
540
if (argfile == NULL){
615
541
conffp = fopen(AFILE, "r");
616
542
} else {
617
543
conffp = fopen(argfile, "r");
618
}
544
}
619
545
if(conffp != NULL){
620
546
char *org_line = NULL;
621
547
char *p, *arg, *new_arg, *line;
622
548
size_t size = 0;
549
ssize_t sret;
623
550
const char whitespace_delims[] = " \r\t\f\v\n";
624
551
const char comment_delim[] = "#";
625
552
626
553
custom_argc = 1;
627
554
custom_argv = malloc(sizeof(char*) * 2);
628
555
if(custom_argv == NULL){
629
556
perror("malloc");
630
exitstatus = EX_OSERR;
557
exitstatus = EXIT_FAILURE;
631
558
goto fallback;
632
559
}
633
560
custom_argv[0] = argv[0];
634
561
custom_argv[1] = NULL;
635
562
636
563
/* for each line in the config file, strip whitespace and ignore
637
564
commented text */
638
565
while(true){
640
567
if(sret == -1){
641
568
break;
642
569
}
643
570
644
571
line = org_line;
645
572
arg = strsep(&line, comment_delim);
646
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
577
new_arg = strdup(p);
651
578
if(new_arg == NULL){
652
579
perror("strdup");
653
exitstatus = EX_OSERR;
580
exitstatus = EXIT_FAILURE;
654
581
free(org_line);
655
582
goto fallback;
656
583
}
660
587
* ((unsigned int) custom_argc + 1));
661
588
if(custom_argv == NULL){
662
589
perror("realloc");
663
exitstatus = EX_OSERR;
590
exitstatus = EXIT_FAILURE;
664
591
free(org_line);
665
592
goto fallback;
666
593
}
667
594
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
669
596
}
670
597
}
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
598
free(org_line);
680
599
} else {
681
600
/* Check for harmful errors and go to fallback. Other errors might
682
601
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
603
perror("fopen");
685
exitstatus = EX_OSERR;
604
exitstatus = EXIT_FAILURE;
686
605
goto fallback;
687
606
}
688
607
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
691
610
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;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
706
616
goto fallback;
707
617
}
708
618
}
709
619
710
620
/* Parse actual command line arguments, to let them override the
711
621
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;
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
726
626
goto fallback;
727
627
}
728
628
733
633
for(char **a = p->argv; *a != NULL; a++){
734
634
fprintf(stderr, "\tArg: %s\n", *a);
735
635
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
637
for(char **a = p->environ; *a != NULL; a++){
738
638
fprintf(stderr, "\t%s\n", *a);
739
639
}
741
641
}
742
642
743
643
/* Strip permissions down to nobody */
644
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
744
648
setgid(gid);
745
if(ret == -1){
649
if (ret == -1){
746
650
perror("setgid");
747
651
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
751
}
752
753
/* Open plugin directory with close_on_exec flag */
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
666
{
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;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
674
}
796
675
}
797
676
}
798
677
800
679
801
680
/* Read and execute any executable in the plugin directory*/
802
681
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
682
dirst = readdir(dir);
806
683
807
684
/* All directory entries have been processed */
808
685
if(dirst == NULL){
809
if(errno == EBADF){
686
if (errno == EBADF){
810
687
perror("readdir");
811
exitstatus = EX_IOERR;
688
exitstatus = EXIT_FAILURE;
812
689
goto fallback;
813
690
}
814
691
break;
859
736
continue;
860
737
}
861
738
}
862
739
863
740
char *filename;
864
741
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
743
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
745
}
872
746
if(ret < 0){
873
747
perror("asprintf");
874
748
continue;
875
749
}
876
750
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
751
ret = stat(filename, &st);
752
if (ret == -1){
879
753
perror("stat");
880
754
free(filename);
881
755
continue;
882
756
}
883
757
884
758
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
760
if(debug){
888
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
762
" with bad type or mode\n", filename);
935
808
}
936
809
937
810
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
811
ret = pipe(pipefd);
812
if (ret == -1){
940
813
perror("pipe");
941
exitstatus = EX_OSERR;
814
exitstatus = EXIT_FAILURE;
942
815
goto fallback;
943
816
}
944
817
/* Ask OS to automatic close the pipe on exec */
945
818
ret = set_cloexec_flag(pipefd[0]);
946
819
if(ret < 0){
947
820
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
821
exitstatus = EXIT_FAILURE;
949
822
goto fallback;
950
823
}
951
824
ret = set_cloexec_flag(pipefd[1]);
952
825
if(ret < 0){
953
826
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
827
exitstatus = EXIT_FAILURE;
955
828
goto fallback;
956
829
}
957
830
/* 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));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
832
if(ret < 0){
962
833
perror("sigprocmask");
963
exitstatus = EX_OSERR;
834
exitstatus = EXIT_FAILURE;
964
835
goto fallback;
965
836
}
966
837
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
971
839
if(pid == -1){
972
840
perror("fork");
973
exitstatus = EX_OSERR;
841
exitstatus = EXIT_FAILURE;
974
842
goto fallback;
975
843
}
976
844
if(pid == 0){
978
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
847
if(ret < 0){
980
848
perror("sigaction");
981
_exit(EX_OSERR);
849
_exit(EXIT_FAILURE);
982
850
}
983
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
852
if(ret < 0){
985
853
perror("sigprocmask");
986
_exit(EX_OSERR);
854
_exit(EXIT_FAILURE);
987
855
}
988
856
989
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
858
if(ret == -1){
991
859
perror("dup2");
992
_exit(EX_OSERR);
860
_exit(EXIT_FAILURE);
993
861
}
994
862
995
863
if(dirfd(dir) < 0){
1000
868
if(p->environ[0] == NULL){
1001
869
if(execv(filename, p->argv) < 0){
1002
870
perror("execv");
1003
_exit(EX_OSERR);
871
_exit(EXIT_FAILURE);
1004
872
}
1005
873
} else {
1006
874
if(execve(filename, p->argv, p->environ) < 0){
1007
875
perror("execve");
1008
_exit(EX_OSERR);
876
_exit(EXIT_FAILURE);
1009
877
}
1010
878
}
1011
879
/* no return */
1012
880
}
1013
881
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
882
close(pipefd[1]); /* Close unused write end of pipe */
1016
883
free(filename);
1017
884
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
885
if (new_plugin == NULL){
1019
886
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
888
if(ret < 0){
1024
889
perror("sigprocmask");
1025
890
}
1026
exitstatus = EX_OSERR;
891
exitstatus = EXIT_FAILURE;
1027
892
goto fallback;
1028
893
}
1029
894
1032
897
1033
898
/* Unblock SIGCHLD so signal handler can be run if this process
1034
899
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
901
if(ret < 0){
1039
902
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
903
exitstatus = EXIT_FAILURE;
1041
904
goto fallback;
1042
905
}
1043
906
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
907
FD_SET(new_plugin->fd, &rfds_all);
1046
908
1047
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1048
910
maxfd = new_plugin->fd;
1049
911
}
1050
912
}
1051
913
1052
TEMP_FAILURE_RETRY(closedir(dir));
914
closedir(dir);
1053
915
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
916
1056
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
918
if(p->pid != 0){
1068
929
while(plugin_list){
1069
930
fd_set rfds = rfds_all;
1070
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
932
if (select_ret == -1){
1072
933
perror("select");
1073
exitstatus = EX_OSERR;
934
exitstatus = EXIT_FAILURE;
1074
935
goto fallback;
1075
936
}
1076
937
/* OK, now either a process completed, or something can be read
1077
938
from one of them */
1078
939
for(plugin *proc = plugin_list; proc != NULL;){
1079
940
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1081
942
/* Only accept the plugin output if it exited cleanly */
1082
943
if(not WIFEXITED(proc->status)
1083
944
or WEXITSTATUS(proc->status) != 0){
1084
945
/* Bad exit by plugin */
1085
946
1086
947
if(debug){
1087
948
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1091
951
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)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
1098
956
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1101
959
}
1102
960
}
1103
961
1104
962
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
963
FD_CLR(proc->fd, &rfds_all);
964
1108
965
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
967
if(ret < 0){
1114
968
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
969
exitstatus = EXIT_FAILURE;
1116
970
goto fallback;
1117
971
}
1118
972
1121
975
proc = next_plugin;
1122
976
1123
977
/* 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)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1127
980
if(ret < 0){
1128
981
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
982
exitstatus = EXIT_FAILURE;
1130
983
goto fallback;
1131
984
}
1132
985
1143
996
proc->buffer_length);
1144
997
if(not bret){
1145
998
perror("print_out_password");
1146
exitstatus = EX_IOERR;
999
exitstatus = EXIT_FAILURE;
1147
1000
}
1148
1001
goto fallback;
1149
1002
}
1150
1003
1151
1004
/* 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 */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1006
/* This process had nothing to say at this time */
1156
1007
proc = proc->next;
1157
1008
continue;
1160
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
1013
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1164
1015
perror("malloc");
1165
exitstatus = EX_OSERR;
1016
exitstatus = EXIT_FAILURE;
1166
1017
goto fallback;
1167
1018
}
1168
1019
proc->buffer_size += BUFFER_SIZE;
1169
1020
}
1170
1021
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1176
1025
/* Read error from this process; ignore the error */
1177
1026
proc = proc->next;
1178
1027
continue;
1179
1028
}
1180
if(sret == 0){
1029
if(ret == 0){
1181
1030
/* got EOF */
1182
1031
proc->eof = true;
1183
1032
} else {
1184
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1185
1034
}
1186
1035
}
1187
1036
}
1188
1189
1037
1038
1190
1039
fallback:
1191
1040
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1042
/* Fallback if all plugins failed, none are found or an error
1195
1043
occured */
1196
1044
bool bret;
1205
1053
bret = print_out_password(passwordbuffer, len);
1206
1054
if(not bret){
1207
1055
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1056
exitstatus = EXIT_FAILURE;
1209
1057
}
1210
1058
}
1211
1059
1213
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1062
if(ret == -1){
1215
1063
perror("sigaction");
1216
exitstatus = EX_OSERR;
1064
exitstatus = EXIT_FAILURE;
1217
1065
}
1218
1066
1219
1067
if(custom_argv != NULL){
1240
1088
}
1241
1089
1242
1090
/* Wait for any remaining child processes to terminate */
1243
do {
1091
do{
1244
1092
ret = wait(NULL);
1245
1093
} while(ret >= 0);
1246
1094
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0