To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.2.19
- compare with another revision
- download diff
- download tarball
- view history from revision 237.2.19
- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:54:01 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.122 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 244.
- Revision ID: teddy@fukt.bsnet.se-20090106225401-7l9f7s3hw9eissra
* mandos (main): Try to find non-privileged user+group in pairs, so
that mismatched pairs are never used.
that mismatched pairs are never used.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- .bzrignore
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
*
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
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
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
67
76
68
#define BUFFER_SIZE 256
77
69
79
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
72
81
73
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
75
84
76
typedef struct plugin{
85
77
char *name; /* can be NULL or any plugin name */
88
80
char **environ;
89
81
int envc;
90
82
bool disabled;
91
83
92
84
/* Variables used for running processes*/
93
85
pid_t pid;
94
86
int fd;
96
88
size_t buffer_size;
97
89
size_t buffer_length;
98
90
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
91
volatile bool completed;
92
volatile int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
100
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
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))){
113
105
return p;
114
106
}
115
107
}
116
108
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
122
111
return NULL;
123
112
}
124
113
char *copy_name = NULL;
125
114
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
129
116
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
117
return NULL;
134
118
}
135
119
}
136
120
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
141
125
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
147
128
free(copy_name);
148
129
free(new_plugin);
149
errno = e;
150
130
return NULL;
151
131
}
152
132
new_plugin->argv[0] = copy_name;
153
133
new_plugin->argv[1] = NULL;
154
134
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
158
136
if(new_plugin->environ == NULL){
159
int e = errno;
160
137
free(copy_name);
161
138
free(new_plugin->argv);
162
139
free(new_plugin);
163
errno = e;
164
140
return NULL;
165
141
}
166
142
new_plugin->environ[0] = NULL;
171
147
}
172
148
173
149
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
150
static bool add_to_char_array(const char *new, char ***array,
176
151
int *len){
177
152
/* Resize the pointed-to array to hold one more pointer */
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
182
155
/* Malloc check */
183
156
if(*array == NULL){
184
157
return false;
185
158
}
186
159
/* Make a copy of the new string */
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
191
161
if(copy == NULL){
192
162
return false;
193
163
}
200
170
}
201
171
202
172
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
173
static bool add_argument(plugin *p, const char *arg){
205
174
if(p == NULL){
206
175
return false;
209
178
}
210
179
211
180
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
181
static bool add_environment(plugin *p, const char *def, bool replace){
214
182
if(p == NULL){
215
183
return false;
221
189
if(strncmp(*e, def, namelen + 1) == 0){
222
190
/* It already exists */
223
191
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
228
193
if(new == NULL){
229
194
return false;
230
195
}
240
205
/*
241
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
207
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
244
209
*/
245
210
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
247
212
/* If reading the flags failed, return error indication now. */
248
213
if(ret < 0){
249
214
return ret;
250
215
}
251
216
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
254
218
}
255
219
256
220
257
221
/* Mark processes as completed when they exit, and save their exit
258
222
status. */
259
223
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
261
224
while(true){
262
225
plugin *proc = plugin_list;
263
226
int status;
267
230
break;
268
231
}
269
232
if(pid == -1){
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
233
if (errno != ECHILD){
234
perror("waitpid");
273
235
}
274
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
275
238
}
276
239
277
240
/* A child exited, find it in process_list */
283
246
continue;
284
247
}
285
248
proc->status = status;
286
proc->completed = 1;
249
proc->completed = true;
287
250
}
288
errno = old_errno;
289
251
}
290
252
291
253
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
254
static bool print_out_password(const char *buffer, size_t length){
294
255
ssize_t ret;
295
256
for(size_t written = 0; written < length; written += (size_t)ret){
303
264
}
304
265
305
266
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
267
static void free_plugin(plugin *plugin_node){
308
268
309
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
315
275
}
316
276
free(plugin_node->environ);
317
277
free(plugin_node->buffer);
318
278
319
279
/* Removes the plugin from the singly-linked list */
320
280
if(plugin_node == plugin_list){
321
281
/* First one - simple */
364
324
sigemptyset(&sigchld_action.sa_mask);
365
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
366
326
if(ret == -1){
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
369
329
goto fallback;
370
330
}
371
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
372
332
if(ret == -1){
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
375
335
goto fallback;
376
336
}
377
337
409
369
.doc = "Group ID the plugins will run as", .group = 3 },
410
370
{ .name = "debug", .key = 132,
411
371
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
421
372
{ .name = NULL }
422
373
};
423
374
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
430
378
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
436
388
}
437
389
}
438
390
}
439
391
break;
440
392
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
442
399
break;
443
400
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
462
418
}
463
419
}
464
420
}
465
421
break;
466
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
467
426
{
468
427
char *envdef = strchr(arg, ':');
469
428
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
429
break;
473
430
}
474
431
*envdef = '\0';
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
480
434
}
481
add_environment(getplugin(arg), envdef, true);
482
435
}
483
436
break;
484
437
case 'd': /* --disable */
485
{
438
if (arg != NULL){
486
439
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
489
442
}
443
p->disabled = true;
490
444
}
491
445
break;
492
446
case 'e': /* --enable */
493
{
447
if (arg != NULL){
494
448
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
497
451
}
452
p->disabled = false;
498
453
}
499
454
break;
500
455
case 128: /* --plugin-dir */
501
456
free(plugindir);
502
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
503
461
break;
504
462
case 129: /* --config-file */
505
463
/* This is already done by parse_opt_config_file() */
506
464
break;
507
465
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
466
uid = (uid_t)strtol(arg, NULL, 10);
516
467
break;
517
468
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
469
gid = (gid_t)strtol(arg, NULL, 10);
526
470
break;
527
471
case 132: /* --debug */
528
472
debug = true;
529
473
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
474
case ARGP_KEY_ARG:
549
475
/* Cryptsetup always passes an argument, which is an empty
550
476
string if "none" was specified in /etc/crypttab. So if
551
477
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
554
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
555
484
default:
556
485
return ARGP_ERR_UNKNOWN;
557
486
}
558
return errno; /* Set to 0 at start */
487
return 0;
559
488
}
560
489
561
490
/* This option parser is the same as parse_opt() above, except it
562
491
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
568
496
case 'g': /* --global-options */
569
497
case 'G': /* --global-env */
570
498
case 'o': /* --options-for */
576
504
case 129: /* --config-file */
577
505
free(argfile);
578
506
argfile = strdup(arg);
579
break;
507
if(argfile == NULL){
508
perror("strdup");
509
}
510
break;
580
511
case 130: /* --userid */
581
512
case 131: /* --groupid */
582
513
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
586
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
587
516
break;
588
517
default:
589
518
return ARGP_ERR_UNKNOWN;
590
519
}
591
return errno;
520
return 0;
592
521
}
593
522
594
523
struct argp argp = { .options = options,
596
525
.args_doc = "",
597
526
.doc = "Mandos plugin runner -- Run plugins" };
598
527
599
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
600
529
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
615
534
goto fallback;
616
535
}
617
536
619
538
argp.parser = parse_opt;
620
539
621
540
/* Open the configfile if available */
622
if(argfile == NULL){
541
if (argfile == NULL){
623
542
conffp = fopen(AFILE, "r");
624
543
} else {
625
544
conffp = fopen(argfile, "r");
626
}
545
}
627
546
if(conffp != NULL){
628
547
char *org_line = NULL;
629
548
char *p, *arg, *new_arg, *line;
630
549
size_t size = 0;
631
550
const char whitespace_delims[] = " \r\t\f\v\n";
632
551
const char comment_delim[] = "#";
633
552
634
553
custom_argc = 1;
635
554
custom_argv = malloc(sizeof(char*) * 2);
636
555
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
639
558
goto fallback;
640
559
}
641
560
custom_argv[0] = argv[0];
642
561
custom_argv[1] = NULL;
643
562
644
563
/* for each line in the config file, strip whitespace and ignore
645
564
commented text */
646
565
while(true){
648
567
if(sret == -1){
649
568
break;
650
569
}
651
570
652
571
line = org_line;
653
572
arg = strsep(&line, comment_delim);
654
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
657
576
}
658
577
new_arg = strdup(p);
659
578
if(new_arg == NULL){
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
662
581
free(org_line);
663
582
goto fallback;
664
583
}
667
586
custom_argv = realloc(custom_argv, sizeof(char *)
668
587
* ((unsigned int) custom_argc + 1));
669
588
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
672
591
free(org_line);
673
592
goto fallback;
674
593
}
675
594
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
677
596
}
678
597
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
687
598
free(org_line);
688
599
} else {
689
600
/* Check for harmful errors and go to fallback. Other errors might
690
601
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
694
605
goto fallback;
695
606
}
696
607
}
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
699
610
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
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;
714
616
goto fallback;
715
617
}
716
618
}
717
619
718
620
/* Parse actual command line arguments, to let them override the
719
621
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
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;
734
626
goto fallback;
735
627
}
736
628
741
633
for(char **a = p->argv; *a != NULL; a++){
742
634
fprintf(stderr, "\tArg: %s\n", *a);
743
635
}
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
745
637
for(char **a = p->environ; *a != NULL; a++){
746
638
fprintf(stderr, "\t%s\n", *a);
747
639
}
748
640
}
749
641
}
750
642
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
643
/* Strip permissions down to nobody */
644
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
774
648
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
778
ret = setuid(uid);
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
649
if (ret == -1){
650
perror("setgid");
651
}
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 */
784
666
{
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
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
}
826
675
}
827
676
}
828
677
830
679
831
680
/* Read and execute any executable in the plugin directory*/
832
681
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
682
dirst = readdir(dir);
836
683
837
684
/* All directory entries have been processed */
838
685
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
842
689
goto fallback;
843
690
}
844
691
break;
874
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
722
size_t suf_len = strlen(*suf);
876
723
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
878
725
== 0)){
879
726
if(debug){
880
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
736
continue;
890
737
}
891
738
}
892
739
893
740
char *filename;
894
741
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
897
743
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
901
745
}
902
746
if(ret < 0){
903
error(0, errno, "asprintf");
747
perror("asprintf");
904
748
continue;
905
749
}
906
750
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
910
754
free(filename);
911
755
continue;
912
756
}
913
757
914
758
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
917
760
if(debug){
918
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
762
" with bad type or mode\n", filename);
924
767
925
768
plugin *p = getplugin(dirst->d_name);
926
769
if(p == NULL){
927
error(0, errno, "getplugin");
770
perror("getplugin");
928
771
free(filename);
929
772
continue;
930
773
}
942
785
if(g != NULL){
943
786
for(char **a = g->argv + 1; *a != NULL; a++){
944
787
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
788
perror("add_argument");
946
789
}
947
790
}
948
791
/* Add global environment variables */
949
792
for(char **e = g->environ; *e != NULL; e++){
950
793
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
794
perror("add_environment");
952
795
}
953
796
}
954
797
}
959
802
if(p->environ[0] != NULL){
960
803
for(char **e = environ; *e != NULL; e++){
961
804
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
805
perror("add_environment");
963
806
}
964
807
}
965
808
}
966
809
967
810
int pipefd[2];
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
972
815
goto fallback;
973
816
}
974
817
/* Ask OS to automatic close the pipe on exec */
975
818
ret = set_cloexec_flag(pipefd[0]);
976
819
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
979
822
goto fallback;
980
823
}
981
824
ret = set_cloexec_flag(pipefd[1]);
982
825
if(ret < 0){
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
985
828
goto fallback;
986
829
}
987
830
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
832
if(ret < 0){
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
994
835
goto fallback;
995
836
}
996
837
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1001
839
if(pid == -1){
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1004
842
goto fallback;
1005
843
}
1006
844
if(pid == 0){
1007
845
/* this is the child process */
1008
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1009
847
if(ret < 0){
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1012
850
}
1013
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1014
852
if(ret < 0){
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1017
855
}
1018
856
1019
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1020
858
if(ret == -1){
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1023
861
}
1024
862
1025
863
if(dirfd(dir) < 0){
1029
867
}
1030
868
if(p->environ[0] == NULL){
1031
869
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
870
perror("execv");
871
_exit(EXIT_FAILURE);
1034
872
}
1035
873
} else {
1036
874
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
875
perror("execve");
876
_exit(EXIT_FAILURE);
1039
877
}
1040
878
}
1041
879
/* no return */
1042
880
}
1043
881
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
882
close(pipefd[1]); /* Close unused write end of pipe */
1046
883
free(filename);
1047
884
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
888
if(ret < 0){
1054
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1055
890
}
1056
exitstatus = EX_OSERR;
891
exitstatus = EXIT_FAILURE;
1057
892
goto fallback;
1058
893
}
1059
894
1062
897
1063
898
/* Unblock SIGCHLD so signal handler can be run if this process
1064
899
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
901
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1071
904
goto fallback;
1072
905
}
1073
906
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
907
FD_SET(new_plugin->fd, &rfds_all);
1076
908
1077
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1078
910
maxfd = new_plugin->fd;
1079
911
}
1080
912
}
1081
913
1082
TEMP_FAILURE_RETRY(closedir(dir));
914
closedir(dir);
1083
915
dir = NULL;
1084
free_plugin(getplugin(NULL));
1085
916
1086
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
918
if(p->pid != 0){
1098
929
while(plugin_list){
1099
930
fd_set rfds = rfds_all;
1100
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1104
935
goto fallback;
1105
936
}
1106
937
/* OK, now either a process completed, or something can be read
1107
938
from one of them */
1108
939
for(plugin *proc = plugin_list; proc != NULL;){
1109
940
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1111
942
/* Only accept the plugin output if it exited cleanly */
1112
943
if(not WIFEXITED(proc->status)
1113
944
or WEXITSTATUS(proc->status) != 0){
1114
945
/* Bad exit by plugin */
1115
946
1116
947
if(debug){
1117
948
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1121
951
WEXITSTATUS(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
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));
1128
956
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1131
959
}
1132
960
}
1133
961
1134
962
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
963
FD_CLR(proc->fd, &rfds_all);
964
1138
965
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1143
967
if(ret < 0){
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1146
970
goto fallback;
1147
971
}
1148
972
1151
975
proc = next_plugin;
1152
976
1153
977
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1157
980
if(ret < 0){
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1160
983
goto fallback;
1161
984
}
1162
985
1172
995
bool bret = print_out_password(proc->buffer,
1173
996
proc->buffer_length);
1174
997
if(not bret){
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1177
1000
}
1178
1001
goto fallback;
1179
1002
}
1180
1003
1181
1004
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
1006
/* This process had nothing to say at this time */
1186
1007
proc = proc->next;
1187
1008
continue;
1190
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
1013
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1196
1017
goto fallback;
1197
1018
}
1198
1019
proc->buffer_size += BUFFER_SIZE;
1199
1020
}
1200
1021
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1205
1024
if(sret < 0){
1206
1025
/* Read error from this process; ignore the error */
1207
1026
proc = proc->next;
1215
1034
}
1216
1035
}
1217
1036
}
1218
1219
1037
1038
1220
1039
fallback:
1221
1040
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1224
1042
/* Fallback if all plugins failed, none are found or an error
1225
1043
occured */
1226
1044
bool bret;
1234
1052
}
1235
1053
bret = print_out_password(passwordbuffer, len);
1236
1054
if(not bret){
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1239
1057
}
1240
1058
}
1241
1059
1242
1060
/* Restore old signal handler */
1243
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1244
1062
if(ret == -1){
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1247
1065
}
1248
1066
1249
1067
if(custom_argv != NULL){
1264
1082
ret = kill(p->pid, SIGTERM);
1265
1083
if(ret == -1 and errno != ESRCH){
1266
1084
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1085
perror("kill");
1268
1086
}
1269
1087
}
1270
1088
}
1271
1089
1272
1090
/* Wait for any remaining child processes to terminate */
1273
do {
1091
do{
1274
1092
ret = wait(NULL);
1275
1093
} while(ret >= 0);
1276
1094
if(errno != ECHILD){
1277
error(0, errno, "wait");
1095
perror("wait");
1278
1096
}
1279
1097
1280
1098
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0