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 237.7.248
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.248
- Committer: Teddy Hogeborn
- Date: 2014-06-14 02:52:31 UTC
- mto: (237.7.272 trunk)
- mto: This revision was merged to the branch mainline in revision 317.
- Revision ID: teddy@recompile.se-20140614025231-xpairrn1olkfgsek
plugin-runner: Do not leak file descriptors on certain errors.
* plugin-runner.c (main): If set_cloexec_flag fails, close pipe FD's.
* plugin-runner.c (main): If set_cloexec_flag fails, close pipe FD's.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
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() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
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() */
75
#include <fnmatch.h> /* fnmatch() */
66
76
67
77
#define BUFFER_SIZE 256
68
78
69
79
#define PDIR "/lib/mandos/plugins.d"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
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);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
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){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
206
244
/*
207
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
246
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
248
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
252
/* If reading the flags failed, return error indication now. */
215
253
if(ret < 0){
216
254
return ret;
217
255
}
218
256
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
220
259
}
221
260
222
261
223
262
/* Mark processes as completed when they exit, and save their exit
224
263
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
226
266
while(true){
227
267
plugin *proc = plugin_list;
228
268
int status;
232
272
break;
233
273
}
234
274
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
275
if(errno == ECHILD){
276
/* No child processes */
277
break;
237
278
}
238
/* No child processes */
239
break;
279
error(0, errno, "waitpid");
240
280
}
241
281
242
282
/* A child exited, find it in process_list */
248
288
continue;
249
289
}
250
290
proc->status = status;
251
proc->completed = true;
291
proc->completed = 1;
252
292
}
293
errno = old_errno;
253
294
}
254
295
255
296
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
297
__attribute__((nonnull, warn_unused_result))
298
static bool print_out_password(const char *buffer, size_t length){
257
299
ssize_t ret;
258
300
for(size_t written = 0; written < length; written += (size_t)ret){
259
301
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
308
}
267
309
268
310
/* Removes and free a plugin from the plugin list */
311
__attribute__((nonnull))
269
312
static void free_plugin(plugin *plugin_node){
270
313
271
314
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
320
}
278
321
free(plugin_node->environ);
279
322
free(plugin_node->buffer);
280
323
281
324
/* Removes the plugin from the singly-linked list */
282
325
if(plugin_node == plugin_list){
283
326
/* First one - simple */
305
348
char *plugindir = NULL;
306
349
char *argfile = NULL;
307
350
FILE *conffp;
308
size_t d_name_len;
309
351
DIR *dir = NULL;
310
352
struct dirent *dirst;
311
353
struct stat st;
312
354
fd_set rfds_all;
313
355
int ret, maxfd = 0;
356
ssize_t sret;
314
357
uid_t uid = 65534;
315
358
gid_t gid = 65534;
316
359
bool debug = false;
320
363
.sa_flags = SA_NOCLDSTOP };
321
364
char **custom_argv = NULL;
322
365
int custom_argc = 0;
366
int dir_fd;
323
367
324
368
/* Establish a signal handler */
325
369
sigemptyset(&sigchld_action.sa_mask);
326
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
371
if(ret == -1){
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
330
374
goto fallback;
331
375
}
332
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
377
if(ret == -1){
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
336
380
goto fallback;
337
381
}
338
382
370
414
.doc = "Group ID the plugins will run as", .group = 3 },
371
415
{ .name = "debug", .key = 132,
372
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
373
426
{ .name = NULL }
374
427
};
375
428
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
379
435
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
389
441
}
390
442
}
443
errno = 0;
391
444
}
392
445
break;
393
446
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
405
449
}
406
450
break;
407
451
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
415
break;
416
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
425
}
426
}
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
427
473
}
428
474
break;
429
475
case 'E': /* --env-for */
430
if(arg == NULL){
431
break;
432
}
433
476
{
434
477
char *envdef = strchr(arg, ':');
435
478
if(envdef == NULL){
436
break;
437
}
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
439
if(p_name == NULL){
440
break;
441
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
442
484
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
445
492
}
446
493
}
447
494
break;
448
495
case 'd': /* --disable */
449
if (arg != NULL){
496
{
450
497
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
453
501
}
454
p->disabled = true;
455
502
}
456
503
break;
457
504
case 'e': /* --enable */
458
if (arg != NULL){
505
{
459
506
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
462
510
}
463
p->disabled = false;
464
511
}
465
512
break;
466
513
case 128: /* --plugin-dir */
514
free(plugindir);
467
515
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
516
if(plugindir != NULL){
517
errno = 0;
518
}
471
519
break;
472
520
case 129: /* --config-file */
473
521
/* This is already done by parse_opt_config_file() */
474
522
break;
475
523
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
477
533
break;
478
534
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
480
544
break;
481
545
case 132: /* --debug */
482
546
debug = true;
483
547
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
484
566
case ARGP_KEY_ARG:
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
486
break;
487
case ARGP_KEY_END:
488
break;
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
489
573
default:
490
574
return ARGP_ERR_UNKNOWN;
491
575
}
492
return 0;
576
return errno; /* Set to 0 at start */
493
577
}
494
578
495
579
/* This option parser is the same as parse_opt() above, except it
496
580
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
501
586
case 'g': /* --global-options */
502
587
case 'G': /* --global-env */
503
588
case 'o': /* --options-for */
507
592
case 128: /* --plugin-dir */
508
593
break;
509
594
case 129: /* --config-file */
595
free(argfile);
510
596
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
597
if(argfile != NULL){
598
errno = 0;
513
599
}
514
break;
600
break;
515
601
case 130: /* --userid */
516
602
case 131: /* --groupid */
517
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
518
607
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
608
break;
521
609
default:
522
610
return ARGP_ERR_UNKNOWN;
523
611
}
524
return 0;
612
return errno;
525
613
}
526
614
527
615
struct argp argp = { .options = options,
529
617
.args_doc = "",
530
618
.doc = "Mandos plugin runner -- Run plugins" };
531
619
532
/* Parse using the parse_opt_config_file in order to get the custom
620
/* Parse using parse_opt_config_file() in order to get the custom
533
621
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
538
636
goto fallback;
539
637
}
540
638
542
640
argp.parser = parse_opt;
543
641
544
642
/* Open the configfile if available */
545
if (argfile == NULL){
643
if(argfile == NULL){
546
644
conffp = fopen(AFILE, "r");
547
645
} else {
548
646
conffp = fopen(argfile, "r");
549
}
647
}
550
648
if(conffp != NULL){
551
649
char *org_line = NULL;
552
650
char *p, *arg, *new_arg, *line;
553
651
size_t size = 0;
554
ssize_t sret;
555
652
const char whitespace_delims[] = " \r\t\f\v\n";
556
653
const char comment_delim[] = "#";
557
654
558
655
custom_argc = 1;
559
656
custom_argv = malloc(sizeof(char*) * 2);
560
657
if(custom_argv == NULL){
561
perror("malloc");
562
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
563
660
goto fallback;
564
661
}
565
662
custom_argv[0] = argv[0];
566
663
custom_argv[1] = NULL;
567
664
568
665
/* for each line in the config file, strip whitespace and ignore
569
666
commented text */
570
667
while(true){
572
669
if(sret == -1){
573
670
break;
574
671
}
575
672
576
673
line = org_line;
577
674
arg = strsep(&line, comment_delim);
578
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
581
678
}
582
679
new_arg = strdup(p);
583
680
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
586
683
free(org_line);
587
684
goto fallback;
588
685
}
589
686
590
687
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
598
701
}
599
702
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
703
custom_argv[custom_argc] = NULL;
601
704
}
602
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
603
714
free(org_line);
604
715
} else {
605
716
/* Check for harmful errors and go to fallback. Other errors might
606
717
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
608
perror("fopen");
609
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
610
721
goto fallback;
611
722
}
612
723
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
615
726
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
621
741
goto fallback;
622
742
}
623
743
}
624
744
625
745
/* Parse actual command line arguments, to let them override the
626
746
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
631
761
goto fallback;
632
762
}
633
763
638
768
for(char **a = p->argv; *a != NULL; a++){
639
769
fprintf(stderr, "\tArg: %s\n", *a);
640
770
}
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
642
772
for(char **a = p->environ; *a != NULL; a++){
643
773
fprintf(stderr, "\t%s\n", *a);
644
774
}
645
775
}
646
776
}
647
777
648
/* Strip permissions down to nobody */
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
649
807
ret = setuid(uid);
650
if (ret == -1){
651
perror("setuid");
652
}
653
setgid(gid);
654
if (ret == -1){
655
perror("setgid");
656
}
657
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
664
if(dir == NULL){
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
667
goto fallback;
668
}
669
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
671
813
{
672
int dir_fd = dirfd(dir);
673
if(dir_fd >= 0){
674
ret = set_cloexec_flag(dir_fd);
675
if(ret < 0){
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
680
844
}
681
845
}
682
846
684
848
685
849
/* Read and execute any executable in the plugin directory*/
686
850
while(true){
687
dirst = readdir(dir);
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
688
854
689
855
/* All directory entries have been processed */
690
856
if(dirst == NULL){
691
if (errno == EBADF){
692
perror("readdir");
693
exitstatus = EXIT_FAILURE;
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
694
860
goto fallback;
695
861
}
696
862
break;
697
863
}
698
864
699
d_name_len = strlen(dirst->d_name);
700
701
865
/* Ignore dotfiles, backup files and other junk */
702
866
{
703
867
bool bad_name = false;
704
705
const char const *bad_prefixes[] = { ".", "#", NULL };
706
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
708
".dpkg-old",
709
".dpkg-divert", NULL };
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
size_t pre_len = strlen(*pre);
712
if((d_name_len >= pre_len)
713
and strncmp((dirst->d_name), *pre, pre_len) == 0){
714
if(debug){
715
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
716
" with bad prefix %s\n", dirst->d_name, *pre);
717
}
718
bad_name = true;
719
break;
720
}
721
}
722
if(bad_name){
723
continue;
724
}
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
size_t suf_len = strlen(*suf);
727
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
729
== 0)){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad suffix %s\n", dirst->d_name, *suf);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
739
if(bad_name){
740
continue;
741
}
742
}
743
744
char *filename;
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
871
NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
886
}
887
bad_name = true;
888
break;
889
}
890
}
891
if(bad_name){
892
continue;
893
}
894
}
895
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
897
#ifdef O_CLOEXEC
898
O_CLOEXEC
899
#else /* not O_CLOEXEC */
900
0
901
#endif /* not O_CLOEXEC */
902
);
903
if(plugin_fd == -1){
904
error(0, errno, "Could not open plugin");
905
continue;
906
}
907
#ifndef O_CLOEXEC
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
746
910
if(ret < 0){
747
perror("asprintf");
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
913
continue;
914
}
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
917
if(ret == -1){
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
748
920
continue;
749
921
}
750
922
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
758
923
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
926
0)) != 0)){
760
927
if(debug){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
763
931
}
764
free(filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
765
933
continue;
766
934
}
767
935
768
936
plugin *p = getplugin(dirst->d_name);
769
937
if(p == NULL){
770
perror("getplugin");
771
free(filename);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
772
940
continue;
773
941
}
774
942
if(p->disabled){
776
944
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
777
945
dirst->d_name);
778
946
}
779
free(filename);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
780
948
continue;
781
949
}
782
950
{
785
953
if(g != NULL){
786
954
for(char **a = g->argv + 1; *a != NULL; a++){
787
955
if(not add_argument(p, *a)){
788
perror("add_argument");
956
error(0, errno, "add_argument");
789
957
}
790
958
}
791
959
/* Add global environment variables */
792
960
for(char **e = g->environ; *e != NULL; e++){
793
961
if(not add_environment(p, *e, false)){
794
perror("add_environment");
962
error(0, errno, "add_environment");
795
963
}
796
964
}
797
965
}
798
966
}
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
802
969
if(p->environ[0] != NULL){
803
970
for(char **e = environ; *e != NULL; e++){
804
971
if(not add_environment(p, *e, false)){
805
perror("add_environment");
972
error(0, errno, "add_environment");
806
973
}
807
974
}
808
975
}
809
976
810
977
int pipefd[2];
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
979
if(ret == -1){
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
815
982
goto fallback;
816
983
}
817
984
/* Ask OS to automatic close the pipe on exec */
818
985
ret = set_cloexec_flag(pipefd[0]);
819
986
if(ret < 0){
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
987
error(0, errno, "set_cloexec_flag");
988
TEMP_FAILURE_RETRY(close(pipefd[0]));
989
TEMP_FAILURE_RETRY(close(pipefd[1]));
990
exitstatus = EX_OSERR;
822
991
goto fallback;
823
992
}
824
993
ret = set_cloexec_flag(pipefd[1]);
825
994
if(ret < 0){
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
828
999
goto fallback;
829
1000
}
830
1001
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
832
1005
if(ret < 0){
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
835
1008
goto fallback;
836
1009
}
837
1010
/* Starting a new process to be watched */
838
pid_t pid = fork();
1011
pid_t pid;
1012
do {
1013
pid = fork();
1014
} while(pid == -1 and errno == EINTR);
839
1015
if(pid == -1){
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1016
error(0, errno, "fork");
1017
exitstatus = EX_OSERR;
842
1018
goto fallback;
843
1019
}
844
1020
if(pid == 0){
845
1021
/* this is the child process */
846
1022
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
847
1023
if(ret < 0){
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1024
error(0, errno, "sigaction");
1025
_exit(EX_OSERR);
850
1026
}
851
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1027
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
1028
if(ret < 0){
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1029
error(0, errno, "sigprocmask");
1030
_exit(EX_OSERR);
855
1031
}
856
1032
857
1033
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
858
1034
if(ret == -1){
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1035
error(0, errno, "dup2");
1036
_exit(EX_OSERR);
861
1037
}
862
1038
863
1039
if(dirfd(dir) < 0){
865
1041
above and must now close it manually here. */
866
1042
closedir(dir);
867
1043
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1044
if(fexecve(plugin_fd, p->argv,
1045
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1046
error(0, errno, "fexecve for %s/%s",
1047
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1048
_exit(EX_OSERR);
878
1049
}
879
1050
/* no return */
880
1051
}
881
1052
/* Parent process */
882
close(pipefd[1]); /* Close unused write end of pipe */
883
free(filename);
1053
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1054
pipe */
1055
TEMP_FAILURE_RETRY(close(plugin_fd));
884
1056
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);
1057
if(new_plugin == NULL){
1058
error(0, errno, "getplugin");
1059
ret = (int)(TEMP_FAILURE_RETRY
1060
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1061
NULL)));
888
1062
if(ret < 0){
889
perror("sigprocmask");
1063
error(0, errno, "sigprocmask");
890
1064
}
891
exitstatus = EXIT_FAILURE;
1065
exitstatus = EX_OSERR;
892
1066
goto fallback;
893
1067
}
894
1068
897
1071
898
1072
/* Unblock SIGCHLD so signal handler can be run if this process
899
1073
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1074
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1075
&sigchld_action.sa_mask,
1076
NULL));
901
1077
if(ret < 0){
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1078
error(0, errno, "sigprocmask");
1079
exitstatus = EX_OSERR;
904
1080
goto fallback;
905
1081
}
906
1082
907
FD_SET(new_plugin->fd, &rfds_all);
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic push
1086
#pragma GCC diagnostic ignored "-Wsign-conversion"
1087
#endif
1088
#endif
1089
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1090
-Wconversion in GNU libc
1091
before 2.16 */
1092
#if defined (__GNUC__) and defined (__GLIBC__)
1093
#if not __GLIBC_PREREQ(2, 16)
1094
#pragma GCC diagnostic pop
1095
#endif
1096
#endif
908
1097
909
if (maxfd < new_plugin->fd){
1098
if(maxfd < new_plugin->fd){
910
1099
maxfd = new_plugin->fd;
911
1100
}
912
913
1101
}
914
1102
915
closedir(dir);
1103
TEMP_FAILURE_RETRY(closedir(dir));
916
1104
dir = NULL;
917
1105
free_plugin(getplugin(NULL));
1106
918
1107
for(plugin *p = plugin_list; p != NULL; p = p->next){
919
1108
if(p->pid != 0){
920
1109
break;
925
1114
free_plugin_list();
926
1115
}
927
1116
}
928
1117
929
1118
/* Main loop while running plugins exist */
930
1119
while(plugin_list){
931
1120
fd_set rfds = rfds_all;
932
1121
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
933
if (select_ret == -1){
934
perror("select");
935
exitstatus = EXIT_FAILURE;
1122
if(select_ret == -1 and errno != EINTR){
1123
error(0, errno, "select");
1124
exitstatus = EX_OSERR;
936
1125
goto fallback;
937
1126
}
938
1127
/* OK, now either a process completed, or something can be read
939
1128
from one of them */
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1129
for(plugin *proc = plugin_list; proc != NULL;){
941
1130
/* Is this process completely done? */
942
if(proc->eof and proc->completed){
1131
if(proc->completed and proc->eof){
943
1132
/* Only accept the plugin output if it exited cleanly */
944
1133
if(not WIFEXITED(proc->status)
945
1134
or WEXITSTATUS(proc->status) != 0){
946
1135
/* Bad exit by plugin */
947
1136
948
1137
if(debug){
949
1138
if(WIFEXITED(proc->status)){
950
fprintf(stderr, "Plugin %u exited with status %d\n",
951
(unsigned int) (proc->pid),
1139
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1140
" status %d\n", proc->name,
1141
(intmax_t) (proc->pid),
952
1142
WEXITSTATUS(proc->status));
953
} else if(WIFSIGNALED(proc->status)) {
954
fprintf(stderr, "Plugin %u killed by signal %d\n",
955
(unsigned int) (proc->pid),
956
WTERMSIG(proc->status));
1143
} else if(WIFSIGNALED(proc->status)){
1144
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1145
" signal %d: %s\n", proc->name,
1146
(intmax_t) (proc->pid),
1147
WTERMSIG(proc->status),
1148
strsignal(WTERMSIG(proc->status)));
957
1149
} else if(WCOREDUMP(proc->status)){
958
fprintf(stderr, "Plugin %d dumped core\n",
959
(unsigned int) (proc->pid));
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1151
" core\n", proc->name, (intmax_t) (proc->pid));
960
1152
}
961
1153
}
962
1154
963
1155
/* Remove the plugin */
964
FD_CLR(proc->fd, &rfds_all);
965
1156
#if defined (__GNUC__) and defined (__GLIBC__)
1157
#if not __GLIBC_PREREQ(2, 16)
1158
#pragma GCC diagnostic push
1159
#pragma GCC diagnostic ignored "-Wsign-conversion"
1160
#endif
1161
#endif
1162
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1163
-Wconversion in GNU libc
1164
before 2.16 */
1165
#if defined (__GNUC__) and defined (__GLIBC__)
1166
#if not __GLIBC_PREREQ(2, 16)
1167
#pragma GCC diagnostic pop
1168
#endif
1169
#endif
1170
966
1171
/* Block signal while modifying process_list */
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
968
1176
if(ret < 0){
969
perror("sigprocmask");
970
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
971
1179
goto fallback;
972
1180
}
1181
1182
plugin *next_plugin = proc->next;
973
1183
free_plugin(proc);
1184
proc = next_plugin;
1185
974
1186
/* We are done modifying process list, so unblock signal */
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
976
NULL);
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
977
1190
if(ret < 0){
978
perror("sigprocmask");
979
exitstatus = EXIT_FAILURE;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
980
1193
goto fallback;
981
1194
}
982
1195
983
1196
if(plugin_list == NULL){
984
1197
break;
985
1198
}
1199
986
1200
continue;
987
1201
}
988
1202
989
1203
/* This process exited nicely, so print its buffer */
990
1204
991
1205
bool bret = print_out_password(proc->buffer,
992
1206
proc->buffer_length);
993
1207
if(not bret){
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
996
1210
}
997
1211
goto fallback;
998
1212
}
999
1213
1000
1214
/* This process has not completed. Does it have any output? */
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1215
#if defined (__GNUC__) and defined (__GLIBC__)
1216
#if not __GLIBC_PREREQ(2, 16)
1217
#pragma GCC diagnostic push
1218
#pragma GCC diagnostic ignored "-Wsign-conversion"
1219
#endif
1220
#endif
1221
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1222
warning from
1223
-Wconversion
1224
in GNU libc
1225
before
1226
2.16 */
1227
#if defined (__GNUC__) and defined (__GLIBC__)
1228
#if not __GLIBC_PREREQ(2, 16)
1229
#pragma GCC diagnostic pop
1230
#endif
1231
#endif
1002
1232
/* This process had nothing to say at this time */
1233
proc = proc->next;
1003
1234
continue;
1004
1235
}
1005
1236
/* Before reading, make the process' data buffer large enough */
1006
1237
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1007
proc->buffer = realloc(proc->buffer, proc->buffer_size
1008
+ (size_t) BUFFER_SIZE);
1009
if (proc->buffer == NULL){
1010
perror("malloc");
1011
exitstatus = EXIT_FAILURE;
1238
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1239
+ (size_t) BUFFER_SIZE);
1240
if(new_buffer == NULL){
1241
error(0, errno, "malloc");
1242
exitstatus = EX_OSERR;
1012
1243
goto fallback;
1013
1244
}
1245
proc->buffer = new_buffer;
1014
1246
proc->buffer_size += BUFFER_SIZE;
1015
1247
}
1016
1248
/* Read from the process */
1017
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1018
BUFFER_SIZE);
1019
if(ret < 0){
1249
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1250
proc->buffer
1251
+ proc->buffer_length,
1252
BUFFER_SIZE));
1253
if(sret < 0){
1020
1254
/* Read error from this process; ignore the error */
1255
proc = proc->next;
1021
1256
continue;
1022
1257
}
1023
if(ret == 0){
1258
if(sret == 0){
1024
1259
/* got EOF */
1025
1260
proc->eof = true;
1026
1261
} else {
1027
proc->buffer_length += (size_t) ret;
1262
proc->buffer_length += (size_t) sret;
1028
1263
}
1029
1264
}
1030
1265
}
1031
1032
1266
1267
1033
1268
fallback:
1034
1269
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1270
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1271
and exitstatus != EX_OK)){
1036
1272
/* Fallback if all plugins failed, none are found or an error
1037
1273
occured */
1038
1274
bool bret;
1046
1282
}
1047
1283
bret = print_out_password(passwordbuffer, len);
1048
1284
if(not bret){
1049
perror("print_out_password");
1050
exitstatus = EXIT_FAILURE;
1285
error(0, errno, "print_out_password");
1286
exitstatus = EX_IOERR;
1051
1287
}
1052
1288
}
1053
1289
1054
1290
/* Restore old signal handler */
1055
1291
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1056
1292
if(ret == -1){
1057
perror("sigaction");
1058
exitstatus = EXIT_FAILURE;
1293
error(0, errno, "sigaction");
1294
exitstatus = EX_OSERR;
1059
1295
}
1060
1296
1061
1297
if(custom_argv != NULL){
1062
1298
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1063
1299
free(*arg);
1069
1305
closedir(dir);
1070
1306
}
1071
1307
1072
/* Free the process list and kill the processes */
1308
/* Kill the processes */
1073
1309
for(plugin *p = plugin_list; p != NULL; p = p->next){
1074
1310
if(p->pid != 0){
1075
1311
close(p->fd);
1076
1312
ret = kill(p->pid, SIGTERM);
1077
1313
if(ret == -1 and errno != ESRCH){
1078
1314
/* Set-uid proccesses might not get closed */
1079
perror("kill");
1315
error(0, errno, "kill");
1080
1316
}
1081
1317
}
1082
1318
}
1083
1319
1084
1320
/* Wait for any remaining child processes to terminate */
1085
do{
1321
do {
1086
1322
ret = wait(NULL);
1087
1323
} while(ret >= 0);
1088
1324
if(errno != ECHILD){
1089
perror("wait");
1325
error(0, errno, "wait");
1090
1326
}
1091
1327
1092
1328
free_plugin_list();
1093
1329
1094
1330
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0