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 237.7.98
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.98
- Committer: Teddy Hogeborn
- Date: 2012-01-01 20:45:53 UTC
- mto: (237.7.109 trunk) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 292.
- Revision ID: teddy@recompile.se-20120101204553-f1zlty873gswtf5n
* README: Hint that the intro(8mandos) manual page is in the server
package.
package.
- files added:
- DBUS-API
- debian/source
- network-hooks.d
- files removed:
- debian/mandos-client.config
- 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 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
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 */
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() */
67
75
68
76
#define BUFFER_SIZE 256
69
77
71
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
80
73
81
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
83
76
84
typedef struct plugin{
77
85
char *name; /* can be NULL or any plugin name */
80
88
char **environ;
81
89
int envc;
82
90
bool disabled;
83
91
84
92
/* Variables used for running processes*/
85
93
pid_t pid;
86
94
int fd;
88
96
size_t buffer_size;
89
97
size_t buffer_length;
90
98
bool eof;
91
volatile bool completed;
92
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
93
101
struct plugin *next;
94
102
} plugin;
95
103
98
106
/* Gets an existing plugin based on name,
99
107
or if none is found, creates a new one */
100
108
static plugin *getplugin(char *name){
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))){
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))){
105
113
return p;
106
114
}
107
115
}
108
116
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
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){
111
122
return NULL;
112
123
}
113
124
char *copy_name = NULL;
114
125
if(name != NULL){
115
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
117
133
return NULL;
118
134
}
119
135
}
120
136
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
125
141
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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;
128
147
free(copy_name);
129
148
free(new_plugin);
149
errno = e;
130
150
return NULL;
131
151
}
132
152
new_plugin->argv[0] = copy_name;
133
153
new_plugin->argv[1] = NULL;
134
154
135
new_plugin->environ = malloc(sizeof(char *));
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
158
if(new_plugin->environ == NULL){
159
int e = errno;
137
160
free(copy_name);
138
161
free(new_plugin->argv);
139
162
free(new_plugin);
163
errno = e;
140
164
return NULL;
141
165
}
142
166
new_plugin->environ[0] = NULL;
147
171
}
148
172
149
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
150
175
static bool add_to_char_array(const char *new, char ***array,
151
176
int *len){
152
177
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
155
182
/* Malloc check */
156
183
if(*array == NULL){
157
184
return false;
158
185
}
159
186
/* Make a copy of the new string */
160
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
161
191
if(copy == NULL){
162
192
return false;
163
193
}
170
200
}
171
201
172
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
173
204
static bool add_argument(plugin *p, const char *arg){
174
205
if(p == NULL){
175
206
return false;
178
209
}
179
210
180
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
181
213
static bool add_environment(plugin *p, const char *def, bool replace){
182
214
if(p == NULL){
183
215
return false;
189
221
if(strncmp(*e, def, namelen + 1) == 0){
190
222
/* It already exists */
191
223
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
193
228
if(new == NULL){
194
229
return false;
195
230
}
205
240
/*
206
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
242
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
244
*/
210
245
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
247
/* If reading the flags failed, return error indication now. */
213
248
if(ret < 0){
214
249
return ret;
215
250
}
216
251
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
218
254
}
219
255
220
256
221
257
/* Mark processes as completed when they exit, and save their exit
222
258
status. */
223
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
224
261
while(true){
225
262
plugin *proc = plugin_list;
226
263
int status;
230
267
break;
231
268
}
232
269
if(pid == -1){
233
if (errno != ECHILD){
234
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
235
273
}
236
/* No child processes */
237
break;
274
error(0, errno, "waitpid");
238
275
}
239
276
240
277
/* A child exited, find it in process_list */
246
283
continue;
247
284
}
248
285
proc->status = status;
249
proc->completed = true;
286
proc->completed = 1;
250
287
}
288
errno = old_errno;
251
289
}
252
290
253
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
254
293
static bool print_out_password(const char *buffer, size_t length){
255
294
ssize_t ret;
256
295
for(size_t written = 0; written < length; written += (size_t)ret){
264
303
}
265
304
266
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
267
307
static void free_plugin(plugin *plugin_node){
268
308
269
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
315
}
276
316
free(plugin_node->environ);
277
317
free(plugin_node->buffer);
278
318
279
319
/* Removes the plugin from the singly-linked list */
280
320
if(plugin_node == plugin_list){
281
321
/* First one - simple */
309
349
struct stat st;
310
350
fd_set rfds_all;
311
351
int ret, maxfd = 0;
352
ssize_t sret;
312
353
uid_t uid = 65534;
313
354
gid_t gid = 65534;
314
355
bool debug = false;
323
364
sigemptyset(&sigchld_action.sa_mask);
324
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
325
366
if(ret == -1){
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
328
369
goto fallback;
329
370
}
330
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
331
372
if(ret == -1){
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
334
375
goto fallback;
335
376
}
336
377
368
409
.doc = "Group ID the plugins will run as", .group = 3 },
369
410
{ .name = "debug", .key = 132,
370
411
.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 },
371
421
{ .name = NULL }
372
422
};
373
423
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
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;
377
430
case 'g': /* --global-options */
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;
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
387
436
}
388
437
}
389
438
}
390
439
break;
391
440
case 'G': /* --global-env */
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
397
}
441
add_environment(getplugin(NULL), arg, true);
398
442
break;
399
443
case 'o': /* --options-for */
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;
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;
417
462
}
418
463
}
419
464
}
420
465
break;
421
466
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
467
{
426
468
char *envdef = strchr(arg, ':');
427
469
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
428
472
break;
429
473
}
430
474
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
475
envdef++;
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
433
480
}
481
add_environment(getplugin(arg), envdef, true);
434
482
}
435
483
break;
436
484
case 'd': /* --disable */
437
if (arg != NULL){
485
{
438
486
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = true;
441
489
}
442
p->disabled = true;
443
490
}
444
491
break;
445
492
case 'e': /* --enable */
446
if (arg != NULL){
493
{
447
494
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
495
if(p != NULL){
496
p->disabled = false;
450
497
}
451
p->disabled = false;
452
498
}
453
499
break;
454
500
case 128: /* --plugin-dir */
455
501
free(plugindir);
456
502
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
503
break;
461
504
case 129: /* --config-file */
462
505
/* This is already done by parse_opt_config_file() */
463
506
break;
464
507
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
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
516
break;
467
517
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
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
526
break;
470
527
case 132: /* --debug */
471
528
debug = true;
472
529
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
*/
473
548
case ARGP_KEY_ARG:
474
549
/* Cryptsetup always passes an argument, which is an empty
475
550
string if "none" was specified in /etc/crypttab. So if
476
551
argument was empty, we ignore it silently. */
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
552
if(arg[0] == '\0'){
553
break;
479
554
}
480
break;
481
case ARGP_KEY_END:
482
break;
483
555
default:
484
556
return ARGP_ERR_UNKNOWN;
485
557
}
486
return 0;
558
return errno; /* Set to 0 at start */
487
559
}
488
560
489
561
/* This option parser is the same as parse_opt() above, except it
490
562
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
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){
495
568
case 'g': /* --global-options */
496
569
case 'G': /* --global-env */
497
570
case 'o': /* --options-for */
503
576
case 129: /* --config-file */
504
577
free(argfile);
505
578
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
579
break;
510
580
case 130: /* --userid */
511
581
case 131: /* --groupid */
512
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
513
586
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
587
break;
516
588
default:
517
589
return ARGP_ERR_UNKNOWN;
518
590
}
519
return 0;
591
return errno;
520
592
}
521
593
522
594
struct argp argp = { .options = options,
524
596
.args_doc = "",
525
597
.doc = "Mandos plugin runner -- Run plugins" };
526
598
527
/* Parse using the parse_opt_config_file in order to get the custom
599
/* Parse using parse_opt_config_file() in order to get the custom
528
600
config file location, if any. */
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;
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;
533
615
goto fallback;
534
616
}
535
617
537
619
argp.parser = parse_opt;
538
620
539
621
/* Open the configfile if available */
540
if (argfile == NULL){
622
if(argfile == NULL){
541
623
conffp = fopen(AFILE, "r");
542
624
} else {
543
625
conffp = fopen(argfile, "r");
544
}
626
}
545
627
if(conffp != NULL){
546
628
char *org_line = NULL;
547
629
char *p, *arg, *new_arg, *line;
548
630
size_t size = 0;
549
ssize_t sret;
550
631
const char whitespace_delims[] = " \r\t\f\v\n";
551
632
const char comment_delim[] = "#";
552
633
553
634
custom_argc = 1;
554
635
custom_argv = malloc(sizeof(char*) * 2);
555
636
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
558
639
goto fallback;
559
640
}
560
641
custom_argv[0] = argv[0];
561
642
custom_argv[1] = NULL;
562
643
563
644
/* for each line in the config file, strip whitespace and ignore
564
645
commented text */
565
646
while(true){
567
648
if(sret == -1){
568
649
break;
569
650
}
570
651
571
652
line = org_line;
572
653
arg = strsep(&line, comment_delim);
573
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
576
657
}
577
658
new_arg = strdup(p);
578
659
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
581
662
free(org_line);
582
663
goto fallback;
583
664
}
586
667
custom_argv = realloc(custom_argv, sizeof(char *)
587
668
* ((unsigned int) custom_argc + 1));
588
669
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
591
672
free(org_line);
592
673
goto fallback;
593
674
}
594
675
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
596
677
}
597
678
}
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
}
598
687
free(org_line);
599
688
} else {
600
689
/* Check for harmful errors and go to fallback. Other errors might
601
690
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
605
694
goto fallback;
606
695
}
607
696
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
610
699
if(custom_argv != NULL){
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;
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;
616
714
goto fallback;
617
715
}
618
716
}
619
717
620
718
/* Parse actual command line arguments, to let them override the
621
719
config file */
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;
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;
626
734
goto fallback;
627
735
}
628
736
633
741
for(char **a = p->argv; *a != NULL; a++){
634
742
fprintf(stderr, "\tArg: %s\n", *a);
635
743
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
637
745
for(char **a = p->environ; *a != NULL; a++){
638
746
fprintf(stderr, "\t%s\n", *a);
639
747
}
640
748
}
641
749
}
642
750
643
/* Strip permissions down to nobody */
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 */
774
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
644
778
ret = setuid(uid);
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
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 */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
666
784
{
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
}
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;
675
826
}
676
827
}
677
828
679
830
680
831
/* Read and execute any executable in the plugin directory*/
681
832
while(true){
682
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
683
836
684
837
/* All directory entries have been processed */
685
838
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
689
842
goto fallback;
690
843
}
691
844
break;
721
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
875
size_t suf_len = strlen(*suf);
723
876
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
878
== 0)){
726
879
if(debug){
727
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
736
889
continue;
737
890
}
738
891
}
739
892
740
893
char *filename;
741
894
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
743
897
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
745
901
}
746
902
if(ret < 0){
747
perror("asprintf");
903
error(0, errno, "asprintf");
748
904
continue;
749
905
}
750
906
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
754
910
free(filename);
755
911
continue;
756
912
}
757
913
758
914
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
917
if(debug){
761
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
919
" with bad type or mode\n", filename);
767
924
768
925
plugin *p = getplugin(dirst->d_name);
769
926
if(p == NULL){
770
perror("getplugin");
927
error(0, errno, "getplugin");
771
928
free(filename);
772
929
continue;
773
930
}
785
942
if(g != NULL){
786
943
for(char **a = g->argv + 1; *a != NULL; a++){
787
944
if(not add_argument(p, *a)){
788
perror("add_argument");
945
error(0, errno, "add_argument");
789
946
}
790
947
}
791
948
/* Add global environment variables */
792
949
for(char **e = g->environ; *e != NULL; e++){
793
950
if(not add_environment(p, *e, false)){
794
perror("add_environment");
951
error(0, errno, "add_environment");
795
952
}
796
953
}
797
954
}
802
959
if(p->environ[0] != NULL){
803
960
for(char **e = environ; *e != NULL; e++){
804
961
if(not add_environment(p, *e, false)){
805
perror("add_environment");
962
error(0, errno, "add_environment");
806
963
}
807
964
}
808
965
}
809
966
810
967
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
815
972
goto fallback;
816
973
}
817
974
/* Ask OS to automatic close the pipe on exec */
818
975
ret = set_cloexec_flag(pipefd[0]);
819
976
if(ret < 0){
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
822
979
goto fallback;
823
980
}
824
981
ret = set_cloexec_flag(pipefd[1]);
825
982
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
828
985
goto fallback;
829
986
}
830
987
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
832
991
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
835
994
goto fallback;
836
995
}
837
996
/* Starting a new process to be watched */
838
pid_t pid = fork();
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
839
1001
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
842
1004
goto fallback;
843
1005
}
844
1006
if(pid == 0){
845
1007
/* this is the child process */
846
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
1009
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
850
1012
}
851
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
1014
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
855
1017
}
856
1018
857
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
1020
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
861
1023
}
862
1024
863
1025
if(dirfd(dir) < 0){
867
1029
}
868
1030
if(p->environ[0] == NULL){
869
1031
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
872
1034
}
873
1035
} else {
874
1036
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
877
1039
}
878
1040
}
879
1041
/* no return */
880
1042
}
881
1043
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
883
1046
free(filename);
884
1047
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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)));
888
1053
if(ret < 0){
889
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
890
1055
}
891
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
892
1057
goto fallback;
893
1058
}
894
1059
897
1062
898
1063
/* Unblock SIGCHLD so signal handler can be run if this process
899
1064
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
901
1068
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
904
1071
goto fallback;
905
1072
}
906
1073
907
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
908
1076
909
if (maxfd < new_plugin->fd){
1077
if(maxfd < new_plugin->fd){
910
1078
maxfd = new_plugin->fd;
911
1079
}
912
1080
}
913
1081
914
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
915
1083
dir = NULL;
1084
free_plugin(getplugin(NULL));
916
1085
917
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
918
1087
if(p->pid != 0){
929
1098
while(plugin_list){
930
1099
fd_set rfds = rfds_all;
931
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
935
1104
goto fallback;
936
1105
}
937
1106
/* OK, now either a process completed, or something can be read
938
1107
from one of them */
939
1108
for(plugin *proc = plugin_list; proc != NULL;){
940
1109
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
942
1111
/* Only accept the plugin output if it exited cleanly */
943
1112
if(not WIFEXITED(proc->status)
944
1113
or WEXITSTATUS(proc->status) != 0){
945
1114
/* Bad exit by plugin */
946
1115
947
1116
if(debug){
948
1117
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
951
1121
WEXITSTATUS(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));
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)));
956
1128
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
959
1131
}
960
1132
}
961
1133
962
1134
/* Remove the plugin */
963
FD_CLR(proc->fd, &rfds_all);
964
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
965
1138
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
967
1143
if(ret < 0){
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
970
1146
goto fallback;
971
1147
}
972
1148
975
1151
proc = next_plugin;
976
1152
977
1153
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
980
1157
if(ret < 0){
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
983
1160
goto fallback;
984
1161
}
985
1162
995
1172
bool bret = print_out_password(proc->buffer,
996
1173
proc->buffer_length);
997
1174
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
1000
1177
}
1001
1178
goto fallback;
1002
1179
}
1003
1180
1004
1181
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1006
1185
/* This process had nothing to say at this time */
1007
1186
proc = proc->next;
1008
1187
continue;
1011
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
1192
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
1017
1196
goto fallback;
1018
1197
}
1019
1198
proc->buffer_size += BUFFER_SIZE;
1020
1199
}
1021
1200
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
1025
1206
/* Read error from this process; ignore the error */
1026
1207
proc = proc->next;
1027
1208
continue;
1028
1209
}
1029
if(ret == 0){
1210
if(sret == 0){
1030
1211
/* got EOF */
1031
1212
proc->eof = true;
1032
1213
} else {
1033
proc->buffer_length += (size_t) ret;
1214
proc->buffer_length += (size_t) sret;
1034
1215
}
1035
1216
}
1036
1217
}
1037
1038
1218
1219
1039
1220
fallback:
1040
1221
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1042
1224
/* Fallback if all plugins failed, none are found or an error
1043
1225
occured */
1044
1226
bool bret;
1052
1234
}
1053
1235
bret = print_out_password(passwordbuffer, len);
1054
1236
if(not bret){
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
1057
1239
}
1058
1240
}
1059
1241
1060
1242
/* Restore old signal handler */
1061
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1062
1244
if(ret == -1){
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1065
1247
}
1066
1248
1067
1249
if(custom_argv != NULL){
1082
1264
ret = kill(p->pid, SIGTERM);
1083
1265
if(ret == -1 and errno != ESRCH){
1084
1266
/* Set-uid proccesses might not get closed */
1085
perror("kill");
1267
error(0, errno, "kill");
1086
1268
}
1087
1269
}
1088
1270
}
1089
1271
1090
1272
/* Wait for any remaining child processes to terminate */
1091
do{
1273
do {
1092
1274
ret = wait(NULL);
1093
1275
} while(ret >= 0);
1094
1276
if(errno != ECHILD){
1095
perror("wait");
1277
error(0, errno, "wait");
1096
1278
}
1097
1279
1098
1280
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0