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- Committer: Teddy Hogeborn
- Date: 2010-10-03 01:38:05 UTC
- mfrom: (24.1.170 mandos)
- Revision ID: teddy@fukt.bsnet.se-20101003013805-ojt18455zatp2ewh
Merge from Björn.
- files added:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
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
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
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
#include <stdio.h> /* perror, fileno(), fprintf(),
31
#include <stdio.h> /* 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 */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
68
75
69
76
#define BUFFER_SIZE 256
70
77
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
101
108
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
109
/* Check for existing plugin with that name */
103
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
111
if((p->name == name)
105
112
or (p->name and name and (strcmp(p->name, name) == 0))){
107
114
}
108
115
}
109
116
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
111
121
if(new_plugin == NULL){
112
122
return NULL;
113
123
}
114
124
char *copy_name = NULL;
115
125
if(name != NULL){
116
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
117
129
if(copy_name == NULL){
130
int e = errno;
118
131
free(new_plugin);
132
errno = e;
119
133
return NULL;
120
134
}
121
135
}
125
139
.disabled = false,
126
140
.next = plugin_list };
127
141
128
new_plugin->argv = malloc(sizeof(char *) * 2);
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
129
145
if(new_plugin->argv == NULL){
146
int e = errno;
130
147
free(copy_name);
131
148
free(new_plugin);
149
errno = e;
132
150
return NULL;
133
151
}
134
152
new_plugin->argv[0] = copy_name;
135
153
new_plugin->argv[1] = NULL;
136
154
137
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
138
158
if(new_plugin->environ == NULL){
159
int e = errno;
139
160
free(copy_name);
140
161
free(new_plugin->argv);
141
162
free(new_plugin);
163
errno = e;
142
164
return NULL;
143
165
}
144
166
new_plugin->environ[0] = NULL;
152
174
static bool add_to_char_array(const char *new, char ***array,
153
175
int *len){
154
176
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
157
181
/* Malloc check */
158
182
if(*array == NULL){
159
183
return false;
160
184
}
161
185
/* Make a copy of the new string */
162
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
163
190
if(copy == NULL){
164
191
return false;
165
192
}
191
218
if(strncmp(*e, def, namelen + 1) == 0){
192
219
/* It already exists */
193
220
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
195
225
if(new == NULL){
196
226
return false;
197
227
}
207
237
/*
208
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
239
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
241
*/
212
242
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
244
/* If reading the flags failed, return error indication now. */
215
245
if(ret < 0){
216
246
return ret;
217
247
}
218
248
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
220
251
}
221
252
222
253
223
254
/* Mark processes as completed when they exit, and save their exit
224
255
status. */
225
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
226
258
while(true){
227
259
plugin *proc = plugin_list;
228
260
int status;
236
268
/* No child processes */
237
269
break;
238
270
}
239
perror("waitpid");
271
error(0, errno, "waitpid");
240
272
}
241
273
242
274
/* A child exited, find it in process_list */
250
282
proc->status = status;
251
283
proc->completed = 1;
252
284
}
285
errno = old_errno;
253
286
}
254
287
255
288
/* Prints out a password to stdout */
277
310
}
278
311
free(plugin_node->environ);
279
312
free(plugin_node->buffer);
280
313
281
314
/* Removes the plugin from the singly-linked list */
282
315
if(plugin_node == plugin_list){
283
316
/* First one - simple */
310
343
struct dirent *dirst;
311
344
struct stat st;
312
345
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
346
int ret, maxfd = 0;
314
347
ssize_t sret;
315
intmax_t tmpmax;
316
348
uid_t uid = 65534;
317
349
gid_t gid = 65534;
318
350
bool debug = false;
327
359
sigemptyset(&sigchld_action.sa_mask);
328
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
361
if(ret == -1){
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
332
364
goto fallback;
333
365
}
334
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
367
if(ret == -1){
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
338
370
goto fallback;
339
371
}
340
372
372
404
.doc = "Group ID the plugins will run as", .group = 3 },
373
405
{ .name = "debug", .key = 132,
374
406
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
375
416
{ .name = NULL }
376
417
};
377
418
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state){
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
380
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
381
424
case 'g': /* --global-options */
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;
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
391
430
}
392
431
}
393
432
}
394
433
break;
395
434
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
401
}
435
add_environment(getplugin(NULL), arg, true);
402
436
break;
403
437
case 'o': /* --options-for */
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;
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
421
456
}
422
457
}
423
458
}
424
459
break;
425
460
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
461
{
430
462
char *envdef = strchr(arg, ':');
431
463
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
432
466
break;
433
467
}
434
468
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
437
474
}
475
add_environment(getplugin(arg), envdef, true);
438
476
}
439
477
break;
440
478
case 'd': /* --disable */
441
if(arg != NULL){
479
{
442
480
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
481
if(p != NULL){
482
p->disabled = true;
445
483
}
446
p->disabled = true;
447
484
}
448
485
break;
449
486
case 'e': /* --enable */
450
if(arg != NULL){
487
{
451
488
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
489
if(p != NULL){
490
p->disabled = false;
454
491
}
455
p->disabled = false;
456
492
}
457
493
break;
458
494
case 128: /* --plugin-dir */
459
495
free(plugindir);
460
496
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
497
break;
465
498
case 129: /* --config-file */
466
499
/* This is already done by parse_opt_config_file() */
467
500
break;
468
501
case 130: /* --userid */
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;
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
476
508
}
509
uid = (uid_t)tmpmax;
477
510
break;
478
511
case 131: /* --groupid */
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;
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
486
518
}
519
gid = (gid_t)tmpmax;
487
520
break;
488
521
case 132: /* --debug */
489
522
debug = true;
490
523
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
491
538
/*
492
539
* When adding more options before this line, remember to also add a
493
540
* "case" to the "parse_opt_config_file" function below.
496
543
/* Cryptsetup always passes an argument, which is an empty
497
544
string if "none" was specified in /etc/crypttab. So if
498
545
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
if(arg[0] == '\0'){
547
break;
501
548
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
549
default:
506
550
return ARGP_ERR_UNKNOWN;
507
551
}
508
return 0;
552
return errno; /* Set to 0 at start */
509
553
}
510
554
511
555
/* This option parser is the same as parse_opt() above, except it
513
557
error_t parse_opt_config_file(int key, char *arg,
514
558
__attribute__((unused))
515
559
struct argp_state *state){
560
errno = 0;
516
561
switch(key){
517
562
case 'g': /* --global-options */
518
563
case 'G': /* --global-env */
525
570
case 129: /* --config-file */
526
571
free(argfile);
527
572
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
573
break;
532
574
case 130: /* --userid */
533
575
case 131: /* --groupid */
534
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
535
580
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
581
break;
538
582
default:
539
583
return ARGP_ERR_UNKNOWN;
540
584
}
541
return 0;
585
return errno;
542
586
}
543
587
544
588
struct argp argp = { .options = options,
548
592
549
593
/* Parse using parse_opt_config_file() in order to get the custom
550
594
config file location, if any. */
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;
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
555
609
goto fallback;
556
610
}
557
611
563
617
conffp = fopen(AFILE, "r");
564
618
} else {
565
619
conffp = fopen(argfile, "r");
566
}
620
}
567
621
if(conffp != NULL){
568
622
char *org_line = NULL;
569
623
char *p, *arg, *new_arg, *line;
570
624
size_t size = 0;
571
625
const char whitespace_delims[] = " \r\t\f\v\n";
572
626
const char comment_delim[] = "#";
573
627
574
628
custom_argc = 1;
575
629
custom_argv = malloc(sizeof(char*) * 2);
576
630
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
579
633
goto fallback;
580
634
}
581
635
custom_argv[0] = argv[0];
582
636
custom_argv[1] = NULL;
583
637
584
638
/* for each line in the config file, strip whitespace and ignore
585
639
commented text */
586
640
while(true){
588
642
if(sret == -1){
589
643
break;
590
644
}
591
645
592
646
line = org_line;
593
647
arg = strsep(&line, comment_delim);
594
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
651
}
598
652
new_arg = strdup(p);
599
653
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
602
656
free(org_line);
603
657
goto fallback;
604
658
}
607
661
custom_argv = realloc(custom_argv, sizeof(char *)
608
662
* ((unsigned int) custom_argc + 1));
609
663
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
612
666
free(org_line);
613
667
goto fallback;
614
668
}
615
669
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
617
671
}
618
672
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
619
681
free(org_line);
620
682
} else {
621
683
/* Check for harmful errors and go to fallback. Other errors might
622
684
not affect opening plugins */
623
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
626
688
goto fallback;
627
689
}
628
690
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
631
693
if(custom_argv != NULL){
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;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
637
708
goto fallback;
638
709
}
639
710
}
640
711
641
712
/* Parse actual command line arguments, to let them override the
642
713
config file */
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;
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
647
728
goto fallback;
648
729
}
649
730
662
743
}
663
744
664
745
/* Strip permissions down to nobody */
746
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
665
750
ret = setuid(uid);
666
751
if(ret == -1){
667
perror("setuid");
668
}
669
setgid(gid);
670
if(ret == -1){
671
perror("setgid");
672
}
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 */
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
687
756
{
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
}
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
696
798
}
697
799
}
698
800
700
802
701
803
/* Read and execute any executable in the plugin directory*/
702
804
while(true){
703
dirst = readdir(dir);
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
704
808
705
809
/* All directory entries have been processed */
706
810
if(dirst == NULL){
707
811
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
710
814
goto fallback;
711
815
}
712
816
break;
742
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
847
size_t suf_len = strlen(*suf);
744
848
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
746
850
== 0)){
747
851
if(debug){
748
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
757
861
continue;
758
862
}
759
863
}
760
864
761
865
char *filename;
762
866
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
764
869
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
766
873
}
767
874
if(ret < 0){
768
perror("asprintf");
875
error(0, errno, "asprintf");
769
876
continue;
770
877
}
771
878
772
ret = stat(filename, &st);
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
773
880
if(ret == -1){
774
perror("stat");
881
error(0, errno, "stat");
775
882
free(filename);
776
883
continue;
777
884
}
778
885
779
886
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
781
889
if(debug){
782
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
891
" with bad type or mode\n", filename);
788
896
789
897
plugin *p = getplugin(dirst->d_name);
790
898
if(p == NULL){
791
perror("getplugin");
899
error(0, errno, "getplugin");
792
900
free(filename);
793
901
continue;
794
902
}
806
914
if(g != NULL){
807
915
for(char **a = g->argv + 1; *a != NULL; a++){
808
916
if(not add_argument(p, *a)){
809
perror("add_argument");
917
error(0, errno, "add_argument");
810
918
}
811
919
}
812
920
/* Add global environment variables */
813
921
for(char **e = g->environ; *e != NULL; e++){
814
922
if(not add_environment(p, *e, false)){
815
perror("add_environment");
923
error(0, errno, "add_environment");
816
924
}
817
925
}
818
926
}
823
931
if(p->environ[0] != NULL){
824
932
for(char **e = environ; *e != NULL; e++){
825
933
if(not add_environment(p, *e, false)){
826
perror("add_environment");
934
error(0, errno, "add_environment");
827
935
}
828
936
}
829
937
}
830
938
831
939
int pipefd[2];
832
ret = pipe(pipefd);
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
833
941
if(ret == -1){
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
836
944
goto fallback;
837
945
}
838
946
/* Ask OS to automatic close the pipe on exec */
839
947
ret = set_cloexec_flag(pipefd[0]);
840
948
if(ret < 0){
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
843
951
goto fallback;
844
952
}
845
953
ret = set_cloexec_flag(pipefd[1]);
846
954
if(ret < 0){
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
849
957
goto fallback;
850
958
}
851
959
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
853
963
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
856
966
goto fallback;
857
967
}
858
968
/* Starting a new process to be watched */
859
pid_t pid = fork();
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
860
973
if(pid == -1){
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
863
976
goto fallback;
864
977
}
865
978
if(pid == 0){
866
979
/* this is the child process */
867
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
868
981
if(ret < 0){
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
871
984
}
872
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
986
if(ret < 0){
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
876
989
}
877
990
878
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
992
if(ret == -1){
880
perror("dup2");
881
_exit(EXIT_FAILURE);
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
882
995
}
883
996
884
997
if(dirfd(dir) < 0){
888
1001
}
889
1002
if(p->environ[0] == NULL){
890
1003
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
893
1006
}
894
1007
} else {
895
1008
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
898
1011
}
899
1012
}
900
1013
/* no return */
901
1014
}
902
1015
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
904
1018
free(filename);
905
1019
plugin *new_plugin = getplugin(dirst->d_name);
906
1020
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
909
1025
if(ret < 0){
910
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
911
1027
}
912
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
913
1029
goto fallback;
914
1030
}
915
1031
918
1034
919
1035
/* Unblock SIGCHLD so signal handler can be run if this process
920
1036
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
922
1040
if(ret < 0){
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
925
1043
goto fallback;
926
1044
}
927
1045
928
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
929
1048
930
1049
if(maxfd < new_plugin->fd){
931
1050
maxfd = new_plugin->fd;
932
1051
}
933
1052
}
934
1053
935
closedir(dir);
1054
TEMP_FAILURE_RETRY(closedir(dir));
936
1055
dir = NULL;
1056
free_plugin(getplugin(NULL));
937
1057
938
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
1059
if(p->pid != 0){
950
1070
while(plugin_list){
951
1071
fd_set rfds = rfds_all;
952
1072
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
956
1076
goto fallback;
957
1077
}
958
1078
/* OK, now either a process completed, or something can be read
964
1084
if(not WIFEXITED(proc->status)
965
1085
or WEXITSTATUS(proc->status) != 0){
966
1086
/* Bad exit by plugin */
967
1087
968
1088
if(debug){
969
1089
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
972
1093
WEXITSTATUS(proc->status));
973
1094
} else if(WIFSIGNALED(proc->status)){
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
977
1100
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
980
1103
}
981
1104
}
982
1105
983
1106
/* Remove the plugin */
984
FD_CLR(proc->fd, &rfds_all);
985
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
986
1110
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
988
1115
if(ret < 0){
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
991
1118
goto fallback;
992
1119
}
993
1120
996
1123
proc = next_plugin;
997
1124
998
1125
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1001
1129
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1004
1132
goto fallback;
1005
1133
}
1006
1134
1016
1144
bool bret = print_out_password(proc->buffer,
1017
1145
proc->buffer_length);
1018
1146
if(not bret){
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1021
1149
}
1022
1150
goto fallback;
1023
1151
}
1024
1152
1025
1153
/* This process has not completed. Does it have any output? */
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1027
1157
/* This process had nothing to say at this time */
1028
1158
proc = proc->next;
1029
1159
continue;
1033
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
1164
+ (size_t) BUFFER_SIZE);
1035
1165
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1038
1168
goto fallback;
1039
1169
}
1040
1170
proc->buffer_size += BUFFER_SIZE;
1041
1171
}
1042
1172
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1045
1177
if(sret < 0){
1046
1178
/* Read error from this process; ignore the error */
1047
1179
proc = proc->next;
1055
1187
}
1056
1188
}
1057
1189
}
1058
1059
1190
1191
1060
1192
fallback:
1061
1193
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1063
1196
/* Fallback if all plugins failed, none are found or an error
1064
1197
occured */
1065
1198
bool bret;
1073
1206
}
1074
1207
bret = print_out_password(passwordbuffer, len);
1075
1208
if(not bret){
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1078
1211
}
1079
1212
}
1080
1213
1081
1214
/* Restore old signal handler */
1082
1215
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
1216
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1086
1219
}
1087
1220
1088
1221
if(custom_argv != NULL){
1103
1236
ret = kill(p->pid, SIGTERM);
1104
1237
if(ret == -1 and errno != ESRCH){
1105
1238
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1239
error(0, errno, "kill");
1107
1240
}
1108
1241
}
1109
1242
}
1110
1243
1111
1244
/* Wait for any remaining child processes to terminate */
1112
do{
1245
do {
1113
1246
ret = wait(NULL);
1114
1247
} while(ret >= 0);
1115
1248
if(errno != ECHILD){
1116
perror("wait");
1249
error(0, errno, "wait");
1117
1250
}
1118
1251
1119
1252
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0