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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:04:47 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090205030447-k1039txjutilj00d
* plugin-runner.c (struct plugin.completed): Changed type to "volatile
sig_atomic_t"; all uses
changed.
sig_atomic_t"; all uses
changed.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2015 Teddy Hogeborn
6
* Copyright © 2008-2015 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
O_CLOEXEC, pipe2() */
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(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
75
68
76
69
#define BUFFER_SIZE 256
77
70
78
71
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
73
82
74
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
98
90
size_t buffer_length;
99
91
bool eof;
100
92
volatile sig_atomic_t completed;
101
int status;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
106
98
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
112
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
104
if((p->name == name)
114
105
or (p->name and name and (strcmp(p->name, name) == 0))){
116
107
}
117
108
}
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
123
111
if(new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
118
free(new_plugin);
134
errno = e;
135
119
return NULL;
136
120
}
137
121
}
141
125
.disabled = false,
142
126
.next = plugin_list };
143
127
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
147
129
if(new_plugin->argv == NULL){
148
int e = errno;
149
130
free(copy_name);
150
131
free(new_plugin);
151
errno = e;
152
132
return NULL;
153
133
}
154
134
new_plugin->argv[0] = copy_name;
155
135
new_plugin->argv[1] = NULL;
156
136
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
160
138
if(new_plugin->environ == NULL){
161
int e = errno;
162
139
free(copy_name);
163
140
free(new_plugin->argv);
164
141
free(new_plugin);
165
errno = e;
166
142
return NULL;
167
143
}
168
144
new_plugin->environ[0] = NULL;
173
149
}
174
150
175
151
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
152
static bool add_to_char_array(const char *new, char ***array,
178
153
int *len){
179
154
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
185
157
/* Malloc check */
186
if(new_array == NULL){
158
if(*array == NULL){
187
159
return false;
188
160
}
189
*array = new_array;
190
161
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
195
163
if(copy == NULL){
196
164
return false;
197
165
}
204
172
}
205
173
206
174
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
175
static bool add_argument(plugin *p, const char *arg){
209
176
if(p == NULL){
210
177
return false;
213
180
}
214
181
215
182
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
183
static bool add_environment(plugin *p, const char *def, bool replace){
218
184
if(p == NULL){
219
185
return false;
221
187
/* namelen = length of name of environment variable */
222
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
189
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
226
192
/* It already exists */
227
193
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
233
196
return false;
234
197
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
237
200
}
238
201
return true;
239
202
}
241
204
return add_to_char_array(def, &(p->environ), &(p->envc));
242
205
}
243
206
244
#ifndef O_CLOEXEC
245
207
/*
246
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
209
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
211
*/
250
__attribute__((warn_unused_result))
251
212
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
253
214
/* If reading the flags failed, return error indication now. */
254
215
if(ret < 0){
255
216
return ret;
256
217
}
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
220
}
261
#endif /* not O_CLOEXEC */
262
221
263
222
264
223
/* Mark processes as completed when they exit, and save their exit
265
224
status. */
266
225
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
226
while(true){
269
227
plugin *proc = plugin_list;
270
228
int status;
278
236
/* No child processes */
279
237
break;
280
238
}
281
error(0, errno, "waitpid");
239
perror("waitpid");
282
240
}
283
241
284
242
/* A child exited, find it in process_list */
292
250
proc->status = status;
293
251
proc->completed = 1;
294
252
}
295
errno = old_errno;
296
253
}
297
254
298
255
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
256
static bool print_out_password(const char *buffer, size_t length){
301
257
ssize_t ret;
302
258
for(size_t written = 0; written < length; written += (size_t)ret){
310
266
}
311
267
312
268
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
269
static void free_plugin(plugin *plugin_node){
315
270
316
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
277
}
323
278
free(plugin_node->environ);
324
279
free(plugin_node->buffer);
325
280
326
281
/* Removes the plugin from the singly-linked list */
327
282
if(plugin_node == plugin_list){
328
283
/* First one - simple */
348
303
349
304
int main(int argc, char *argv[]){
350
305
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
306
char *argfile = NULL;
353
307
FILE *conffp;
354
struct dirent **direntries = NULL;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
355
311
struct stat st;
356
312
fd_set rfds_all;
357
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
358
314
ssize_t sret;
315
intmax_t tmpmax;
359
316
uid_t uid = 65534;
360
317
gid_t gid = 65534;
361
318
bool debug = false;
365
322
.sa_flags = SA_NOCLDSTOP };
366
323
char **custom_argv = NULL;
367
324
int custom_argc = 0;
368
int dir_fd = -1;
369
325
370
326
/* Establish a signal handler */
371
327
sigemptyset(&sigchld_action.sa_mask);
372
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
329
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
376
332
goto fallback;
377
333
}
378
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
335
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
382
338
goto fallback;
383
339
}
384
340
416
372
.doc = "Group ID the plugins will run as", .group = 3 },
417
373
{ .name = "debug", .key = 132,
418
374
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
432
375
{ .name = NULL }
433
376
};
434
377
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state){
438
380
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
381
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
447
391
}
448
392
}
449
errno = 0;
450
393
}
451
394
break;
452
395
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
455
401
}
456
402
break;
457
403
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
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;
421
}
422
}
479
423
}
480
424
break;
481
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
482
429
{
483
430
char *envdef = strchr(arg, ':');
484
431
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
432
break;
488
433
}
489
434
*envdef = '\0';
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
498
437
}
499
438
}
500
439
break;
501
440
case 'd': /* --disable */
502
{
441
if(arg != NULL){
503
442
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
507
445
}
446
p->disabled = true;
508
447
}
509
448
break;
510
449
case 'e': /* --enable */
511
{
450
if(arg != NULL){
512
451
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
516
454
}
455
p->disabled = false;
517
456
}
518
457
break;
519
458
case 128: /* --plugin-dir */
520
459
free(plugindir);
521
460
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
461
if(plugindir == NULL){
462
perror("strdup");
463
}
525
464
break;
526
465
case 129: /* --config-file */
527
466
/* This is already done by parse_opt_config_file() */
528
467
break;
529
468
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
536
476
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
477
break;
540
478
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
547
486
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
487
break;
551
488
case 132: /* --debug */
552
489
debug = true;
553
490
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
491
/*
576
492
* When adding more options before this line, remember to also add a
577
493
* "case" to the "parse_opt_config_file" function below.
580
496
/* Cryptsetup always passes an argument, which is an empty
581
497
string if "none" was specified in /etc/crypttab. So if
582
498
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
585
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
586
505
default:
587
506
return ARGP_ERR_UNKNOWN;
588
507
}
589
return errno; /* Set to 0 at start */
508
return 0;
590
509
}
591
510
592
511
/* This option parser is the same as parse_opt() above, except it
594
513
error_t parse_opt_config_file(int key, char *arg,
595
514
__attribute__((unused))
596
515
struct argp_state *state){
597
errno = 0;
598
516
switch(key){
599
517
case 'g': /* --global-options */
600
518
case 'G': /* --global-env */
607
525
case 129: /* --config-file */
608
526
free(argfile);
609
527
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
528
if(argfile == NULL){
529
perror("strdup");
612
530
}
613
break;
531
break;
614
532
case 130: /* --userid */
615
533
case 131: /* --groupid */
616
534
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
622
537
break;
623
538
default:
624
539
return ARGP_ERR_UNKNOWN;
625
540
}
626
return errno;
541
return 0;
627
542
}
628
543
629
544
struct argp argp = { .options = options,
633
548
634
549
/* Parse using parse_opt_config_file() in order to get the custom
635
550
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
650
555
goto fallback;
651
556
}
652
557
658
563
conffp = fopen(AFILE, "r");
659
564
} else {
660
565
conffp = fopen(argfile, "r");
661
}
566
}
662
567
if(conffp != NULL){
663
568
char *org_line = NULL;
664
569
char *p, *arg, *new_arg, *line;
665
570
size_t size = 0;
666
571
const char whitespace_delims[] = " \r\t\f\v\n";
667
572
const char comment_delim[] = "#";
668
573
669
574
custom_argc = 1;
670
575
custom_argv = malloc(sizeof(char*) * 2);
671
576
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
674
579
goto fallback;
675
580
}
676
581
custom_argv[0] = argv[0];
677
582
custom_argv[1] = NULL;
678
583
679
584
/* for each line in the config file, strip whitespace and ignore
680
585
commented text */
681
586
while(true){
683
588
if(sret == -1){
684
589
break;
685
590
}
686
591
687
592
line = org_line;
688
593
arg = strsep(&line, comment_delim);
689
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
692
597
}
693
598
new_arg = strdup(p);
694
599
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
697
602
free(org_line);
698
603
goto fallback;
699
604
}
700
605
701
606
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
714
614
}
715
615
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
616
custom_argv[custom_argc] = NULL;
717
617
}
718
618
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
727
619
free(org_line);
728
620
} else {
729
621
/* Check for harmful errors and go to fallback. Other errors might
730
622
not affect opening plugins */
731
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
734
626
goto fallback;
735
627
}
736
628
}
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
739
631
if(custom_argv != NULL){
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
754
637
goto fallback;
755
638
}
756
639
}
757
640
758
641
/* Parse actual command line arguments, to let them override the
759
642
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
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;
647
goto fallback;
793
648
}
794
649
795
650
if(debug){
806
661
}
807
662
}
808
663
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
664
/* Strip permissions down to nobody */
838
665
ret = setuid(uid);
839
666
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
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 */
844
687
{
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
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;
889
695
}
890
696
}
891
return 1;
892
}
893
894
#ifdef __GLIBC__
895
#if __GLIBC_PREREQ(2, 15)
896
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
897
alphasort);
898
#else /* not __GLIBC_PREREQ(2, 15) */
899
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
900
&direntries, good_name, alphasort);
901
#endif /* not __GLIBC_PREREQ(2, 15) */
902
#else /* not __GLIBC__ */
903
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
904
&direntries, good_name, alphasort);
905
#endif /* not __GLIBC__ */
906
if(numplugins == -1){
907
error(0, errno, "Could not scan plugin dir");
908
direntries = NULL;
909
exitstatus = EX_OSERR;
910
goto fallback;
911
697
}
912
698
913
699
FD_ZERO(&rfds_all);
914
700
915
701
/* Read and execute any executable in the plugin directory*/
916
for(int i = 0; i < numplugins; i++){
917
918
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
919
if(plugin_fd == -1){
920
error(0, errno, "Could not open plugin");
921
free(direntries[i]);
702
while(true){
703
dirst = readdir(dir);
704
705
/* All directory entries have been processed */
706
if(dirst == NULL){
707
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
break;
713
}
714
715
d_name_len = strlen(dirst->d_name);
716
717
/* Ignore dotfiles, backup files and other junk */
718
{
719
bool bad_name = false;
720
721
const char const *bad_prefixes[] = { ".", "#", NULL };
722
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
".dpkg-old",
725
".dpkg-bak",
726
".dpkg-divert", NULL };
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
size_t pre_len = strlen(*pre);
729
if((d_name_len >= pre_len)
730
and strncmp((dirst->d_name), *pre, pre_len) == 0){
731
if(debug){
732
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
733
" with bad prefix %s\n", dirst->d_name, *pre);
734
}
735
bad_name = true;
736
break;
737
}
738
}
739
if(bad_name){
740
continue;
741
}
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
size_t suf_len = strlen(*suf);
744
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
746
== 0)){
747
if(debug){
748
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
749
" with bad suffix %s\n", dirst->d_name, *suf);
750
}
751
bad_name = true;
752
break;
753
}
754
}
755
756
if(bad_name){
757
continue;
758
}
759
}
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
922
769
continue;
923
770
}
924
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
771
772
ret = stat(filename, &st);
925
773
if(ret == -1){
926
error(0, errno, "stat");
927
close(plugin_fd);
928
free(direntries[i]);
774
perror("stat");
775
free(filename);
929
776
continue;
930
777
}
931
778
932
779
/* Ignore non-executable files */
933
if(not S_ISREG(st.st_mode)
934
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
935
X_OK, 0)) != 0)){
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
936
781
if(debug){
937
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
938
" with bad type or mode\n",
939
plugindir != NULL ? plugindir : PDIR,
940
direntries[i]->d_name);
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" with bad type or mode\n", filename);
941
784
}
942
close(plugin_fd);
943
free(direntries[i]);
785
free(filename);
944
786
continue;
945
787
}
946
788
947
plugin *p = getplugin(direntries[i]->d_name);
789
plugin *p = getplugin(dirst->d_name);
948
790
if(p == NULL){
949
error(0, errno, "getplugin");
950
close(plugin_fd);
951
free(direntries[i]);
791
perror("getplugin");
792
free(filename);
952
793
continue;
953
794
}
954
795
if(p->disabled){
955
796
if(debug){
956
797
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
957
direntries[i]->d_name);
798
dirst->d_name);
958
799
}
959
close(plugin_fd);
960
free(direntries[i]);
800
free(filename);
961
801
continue;
962
802
}
963
803
{
966
806
if(g != NULL){
967
807
for(char **a = g->argv + 1; *a != NULL; a++){
968
808
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
809
perror("add_argument");
970
810
}
971
811
}
972
812
/* Add global environment variables */
973
813
for(char **e = g->environ; *e != NULL; e++){
974
814
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
815
perror("add_environment");
976
816
}
977
817
}
978
818
}
979
819
}
980
/* If this plugin has any environment variables, we need to
981
duplicate the environment from this process, too. */
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
982
823
if(p->environ[0] != NULL){
983
824
for(char **e = environ; *e != NULL; e++){
984
825
if(not add_environment(p, *e, false)){
985
error(0, errno, "add_environment");
826
perror("add_environment");
986
827
}
987
828
}
988
829
}
989
830
990
831
int pipefd[2];
991
#ifndef O_CLOEXEC
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
993
#else /* O_CLOEXEC */
994
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
995
#endif /* O_CLOEXEC */
832
ret = pipe(pipefd);
996
833
if(ret == -1){
997
error(0, errno, "pipe");
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
if(pipefd[0] >= FD_SETSIZE){
1003
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1004
FD_SETSIZE);
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
1009
goto fallback;
1010
}
1011
#ifndef O_CLOEXEC
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
836
goto fallback;
837
}
1012
838
/* Ask OS to automatic close the pipe on exec */
1013
839
ret = set_cloexec_flag(pipefd[0]);
1014
840
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
1020
843
goto fallback;
1021
844
}
1022
845
ret = set_cloexec_flag(pipefd[1]);
1023
846
if(ret < 0){
1024
error(0, errno, "set_cloexec_flag");
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
1029
849
goto fallback;
1030
850
}
1031
#endif /* not O_CLOEXEC */
1032
851
/* Block SIGCHLD until process is safely in process list */
1033
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1034
&sigchld_action.sa_mask,
1035
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1036
853
if(ret < 0){
1037
error(0, errno, "sigprocmask");
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1040
856
goto fallback;
1041
857
}
1042
858
/* Starting a new process to be watched */
1043
pid_t pid;
1044
do {
1045
pid = fork();
1046
} while(pid == -1 and errno == EINTR);
859
pid_t pid = fork();
1047
860
if(pid == -1){
1048
error(0, errno, "fork");
1049
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1050
&sigchld_action.sa_mask, NULL));
1051
close(pipefd[0]);
1052
close(pipefd[1]);
1053
exitstatus = EX_OSERR;
1054
free(direntries[i]);
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
1055
863
goto fallback;
1056
864
}
1057
865
if(pid == 0){
1058
866
/* this is the child process */
1059
867
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
868
if(ret < 0){
1061
error(0, errno, "sigaction");
1062
_exit(EX_OSERR);
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1063
871
}
1064
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
873
if(ret < 0){
1066
error(0, errno, "sigprocmask");
1067
_exit(EX_OSERR);
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1068
876
}
1069
877
1070
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1071
879
if(ret == -1){
1072
error(0, errno, "dup2");
1073
_exit(EX_OSERR);
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1074
882
}
1075
883
1076
if(fexecve(plugin_fd, p->argv,
1077
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1078
error(0, errno, "fexecve for %s/%s",
1079
plugindir != NULL ? plugindir : PDIR,
1080
direntries[i]->d_name);
1081
_exit(EX_OSERR);
884
if(dirfd(dir) < 0){
885
/* If dir has no file descriptor, we could not set FD_CLOEXEC
886
above and must now close it manually here. */
887
closedir(dir);
888
}
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
1082
899
}
1083
900
/* no return */
1084
901
}
1085
902
/* Parent process */
1086
903
close(pipefd[1]); /* Close unused write end of pipe */
1087
close(plugin_fd);
1088
plugin *new_plugin = getplugin(direntries[i]->d_name);
904
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
1089
906
if(new_plugin == NULL){
1090
error(0, errno, "getplugin");
1091
ret = (int)(TEMP_FAILURE_RETRY
1092
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1093
NULL)));
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1094
909
if(ret < 0){
1095
error(0, errno, "sigprocmask");
910
perror("sigprocmask");
1096
911
}
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
912
exitstatus = EXIT_FAILURE;
1099
913
goto fallback;
1100
914
}
1101
free(direntries[i]);
1102
915
1103
916
new_plugin->pid = pid;
1104
917
new_plugin->fd = pipefd[0];
1105
918
1106
919
/* Unblock SIGCHLD so signal handler can be run if this process
1107
920
has already completed */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1109
&sigchld_action.sa_mask,
1110
NULL));
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
922
if(ret < 0){
1112
error(0, errno, "sigprocmask");
1113
exitstatus = EX_OSERR;
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1114
925
goto fallback;
1115
926
}
1116
927
1117
#if defined (__GNUC__) and defined (__GLIBC__)
1118
#if not __GLIBC_PREREQ(2, 16)
1119
#pragma GCC diagnostic push
1120
#pragma GCC diagnostic ignored "-Wsign-conversion"
1121
#endif
1122
#endif
1123
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1124
-Wconversion in GNU libc
1125
before 2.16 */
1126
#if defined (__GNUC__) and defined (__GLIBC__)
1127
#if not __GLIBC_PREREQ(2, 16)
1128
#pragma GCC diagnostic pop
1129
#endif
1130
#endif
928
FD_SET(new_plugin->fd, &rfds_all);
1131
929
1132
930
if(maxfd < new_plugin->fd){
1133
931
maxfd = new_plugin->fd;
1134
932
}
1135
933
}
1136
934
1137
free(direntries);
1138
direntries = NULL;
1139
close(dir_fd);
1140
dir_fd = -1;
1141
free_plugin(getplugin(NULL));
935
closedir(dir);
936
dir = NULL;
1142
937
1143
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
1144
939
if(p->pid != 0){
1155
950
while(plugin_list){
1156
951
fd_set rfds = rfds_all;
1157
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1158
if(select_ret == -1 and errno != EINTR){
1159
error(0, errno, "select");
1160
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1161
956
goto fallback;
1162
957
}
1163
958
/* OK, now either a process completed, or something can be read
1164
959
from one of them */
1165
960
for(plugin *proc = plugin_list; proc != NULL;){
1166
961
/* Is this process completely done? */
1167
if(proc->completed and proc->eof){
962
if(proc->eof and proc->completed){
1168
963
/* Only accept the plugin output if it exited cleanly */
1169
964
if(not WIFEXITED(proc->status)
1170
965
or WEXITSTATUS(proc->status) != 0){
1171
966
/* Bad exit by plugin */
1172
967
1173
968
if(debug){
1174
969
if(WIFEXITED(proc->status)){
1175
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1176
" status %d\n", proc->name,
1177
(intmax_t) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1178
972
WEXITSTATUS(proc->status));
1179
973
} else if(WIFSIGNALED(proc->status)){
1180
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1181
" signal %d: %s\n", proc->name,
1182
(intmax_t) (proc->pid),
1183
WTERMSIG(proc->status),
1184
strsignal(WTERMSIG(proc->status)));
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
1185
977
} else if(WCOREDUMP(proc->status)){
1186
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1187
" core\n", proc->name, (intmax_t) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1188
980
}
1189
981
}
1190
982
1191
983
/* Remove the plugin */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic push
1195
#pragma GCC diagnostic ignored "-Wsign-conversion"
1196
#endif
1197
#endif
1198
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1199
-Wconversion in GNU libc
1200
before 2.16 */
1201
#if defined (__GNUC__) and defined (__GLIBC__)
1202
#if not __GLIBC_PREREQ(2, 16)
1203
#pragma GCC diagnostic pop
1204
#endif
1205
#endif
1206
984
FD_CLR(proc->fd, &rfds_all);
985
1207
986
/* Block signal while modifying process_list */
1208
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1209
(SIG_BLOCK,
1210
&sigchld_action.sa_mask,
1211
NULL));
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1212
988
if(ret < 0){
1213
error(0, errno, "sigprocmask");
1214
exitstatus = EX_OSERR;
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1215
991
goto fallback;
1216
992
}
1217
993
1220
996
proc = next_plugin;
1221
997
1222
998
/* We are done modifying process list, so unblock signal */
1223
ret = (int)(TEMP_FAILURE_RETRY
1224
(sigprocmask(SIG_UNBLOCK,
1225
&sigchld_action.sa_mask, NULL)));
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1226
1001
if(ret < 0){
1227
error(0, errno, "sigprocmask");
1228
exitstatus = EX_OSERR;
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1229
1004
goto fallback;
1230
1005
}
1231
1006
1241
1016
bool bret = print_out_password(proc->buffer,
1242
1017
proc->buffer_length);
1243
1018
if(not bret){
1244
error(0, errno, "print_out_password");
1245
exitstatus = EX_IOERR;
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1246
1021
}
1247
1022
goto fallback;
1248
1023
}
1249
1024
1250
1025
/* This process has not completed. Does it have any output? */
1251
#if defined (__GNUC__) and defined (__GLIBC__)
1252
#if not __GLIBC_PREREQ(2, 16)
1253
#pragma GCC diagnostic push
1254
#pragma GCC diagnostic ignored "-Wsign-conversion"
1255
#endif
1256
#endif
1257
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1258
warning from
1259
-Wconversion
1260
in GNU libc
1261
before
1262
2.16 */
1263
#if defined (__GNUC__) and defined (__GLIBC__)
1264
#if not __GLIBC_PREREQ(2, 16)
1265
#pragma GCC diagnostic pop
1266
#endif
1267
#endif
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1268
1027
/* This process had nothing to say at this time */
1269
1028
proc = proc->next;
1270
1029
continue;
1271
1030
}
1272
1031
/* Before reading, make the process' data buffer large enough */
1273
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1274
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1275
+ (size_t) BUFFER_SIZE);
1276
if(new_buffer == NULL){
1277
error(0, errno, "malloc");
1278
exitstatus = EX_OSERR;
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1279
1038
goto fallback;
1280
1039
}
1281
proc->buffer = new_buffer;
1282
1040
proc->buffer_size += BUFFER_SIZE;
1283
1041
}
1284
1042
/* Read from the process */
1285
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1286
proc->buffer
1287
+ proc->buffer_length,
1288
BUFFER_SIZE));
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1289
1045
if(sret < 0){
1290
1046
/* Read error from this process; ignore the error */
1291
1047
proc = proc->next;
1299
1055
}
1300
1056
}
1301
1057
}
1302
1303
1058
1059
1304
1060
fallback:
1305
1061
1306
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1307
and exitstatus != EX_OK)){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1308
1063
/* Fallback if all plugins failed, none are found or an error
1309
1064
occured */
1310
1065
bool bret;
1318
1073
}
1319
1074
bret = print_out_password(passwordbuffer, len);
1320
1075
if(not bret){
1321
error(0, errno, "print_out_password");
1322
exitstatus = EX_IOERR;
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1323
1078
}
1324
1079
}
1325
1080
1326
1081
/* Restore old signal handler */
1327
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1328
1083
if(ret == -1){
1329
error(0, errno, "sigaction");
1330
exitstatus = EX_OSERR;
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1331
1086
}
1332
1087
1333
1088
if(custom_argv != NULL){
1337
1092
free(custom_argv);
1338
1093
}
1339
1094
1340
free(direntries);
1341
1342
if(dir_fd != -1){
1343
close(dir_fd);
1095
if(dir != NULL){
1096
closedir(dir);
1344
1097
}
1345
1098
1346
1099
/* Kill the processes */
1350
1103
ret = kill(p->pid, SIGTERM);
1351
1104
if(ret == -1 and errno != ESRCH){
1352
1105
/* Set-uid proccesses might not get closed */
1353
error(0, errno, "kill");
1106
perror("kill");
1354
1107
}
1355
1108
}
1356
1109
}
1357
1110
1358
1111
/* Wait for any remaining child processes to terminate */
1359
do {
1112
do{
1360
1113
ret = wait(NULL);
1361
1114
} while(ret >= 0);
1362
1115
if(errno != ECHILD){
1363
error(0, errno, "wait");
1116
perror("wait");
1364
1117
}
1365
1118
1366
1119
free_plugin_list();
1367
1120
1368
1121
free(plugindir);
1369
free(pluginhelperdir);
1370
1122
free(argfile);
1371
1123
1372
1124
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0