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- Committer: Teddy Hogeborn
- Date: 2015-06-02 17:43:53 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150602174353-tvqw31mgxfapl985
mandos.service ([Service]/KillMode): Changed to "mixed".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files removed:
- etc-plugins.d-README
- 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, pipe2() */
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
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
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() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
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() */
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
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#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() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
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;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
83
77
84
typedef struct plugin{
78
85
char *name; /* can be NULL or any plugin name */
81
88
char **environ;
82
89
int envc;
83
90
bool disabled;
84
91
85
92
/* Variables used for running processes*/
86
93
pid_t pid;
87
94
int fd;
89
96
size_t buffer_size;
90
97
size_t buffer_length;
91
98
bool eof;
92
volatile bool completed;
93
volatile int status;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
98
105
99
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
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))){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
106
114
return p;
107
115
}
108
116
}
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
112
123
return NULL;
113
124
}
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
118
134
return NULL;
119
135
}
120
136
}
121
137
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
126
142
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
129
148
free(copy_name);
130
149
free(new_plugin);
150
errno = e;
131
151
return NULL;
132
152
}
133
153
new_plugin->argv[0] = copy_name;
134
154
new_plugin->argv[1] = NULL;
135
155
136
new_plugin->environ = malloc(sizeof(char *));
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
159
if(new_plugin->environ == NULL){
160
int e = errno;
138
161
free(copy_name);
139
162
free(new_plugin->argv);
140
163
free(new_plugin);
164
errno = e;
141
165
return NULL;
142
166
}
143
167
new_plugin->environ[0] = NULL;
148
172
}
149
173
150
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
151
176
static bool add_to_char_array(const char *new, char ***array,
152
177
int *len){
153
178
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
156
184
/* Malloc check */
157
if(*array == NULL){
185
if(new_array == NULL){
158
186
return false;
159
187
}
188
*array = new_array;
160
189
/* Make a copy of the new string */
161
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
162
194
if(copy == NULL){
163
195
return false;
164
196
}
171
203
}
172
204
173
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
174
207
static bool add_argument(plugin *p, const char *arg){
175
208
if(p == NULL){
176
209
return false;
179
212
}
180
213
181
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
182
216
static bool add_environment(plugin *p, const char *def, bool replace){
183
217
if(p == NULL){
184
218
return false;
186
220
/* namelen = length of name of environment variable */
187
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
222
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
191
225
/* It already exists */
192
226
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
195
232
return false;
196
233
}
197
*e = new;
198
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
199
236
}
200
237
return true;
201
238
}
203
240
return add_to_char_array(def, &(p->environ), &(p->envc));
204
241
}
205
242
243
#ifndef O_CLOEXEC
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
}
260
#endif /* not O_CLOEXEC */
221
261
222
262
223
263
/* Mark processes as completed when they exit, and save their exit
224
264
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
265
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
226
267
while(true){
227
268
plugin *proc = plugin_list;
228
269
int status;
232
273
break;
233
274
}
234
275
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
237
279
}
238
/* No child processes */
239
break;
280
error(0, errno, "waitpid");
240
281
}
241
282
242
283
/* A child exited, find it in process_list */
248
289
continue;
249
290
}
250
291
proc->status = status;
251
proc->completed = true;
292
proc->completed = 1;
252
293
}
294
errno = old_errno;
253
295
}
254
296
255
297
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
298
__attribute__((nonnull, warn_unused_result))
299
static bool print_out_password(const char *buffer, size_t length){
257
300
ssize_t ret;
258
301
for(size_t written = 0; written < length; written += (size_t)ret){
259
302
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
309
}
267
310
268
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
269
313
static void free_plugin(plugin *plugin_node){
270
314
271
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
321
}
278
322
free(plugin_node->environ);
279
323
free(plugin_node->buffer);
280
324
281
325
/* Removes the plugin from the singly-linked list */
282
326
if(plugin_node == plugin_list){
283
327
/* First one - simple */
305
349
char *plugindir = NULL;
306
350
char *argfile = NULL;
307
351
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
352
struct dirent **direntries = NULL;
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 = -1;
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;
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
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
679
858
}
680
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
681
880
}
682
881
683
882
FD_ZERO(&rfds_all);
684
883
685
884
/* Read and execute any executable in the plugin directory*/
686
while(true){
687
dirst = readdir(dir);
688
689
/* All directory entries have been processed */
690
if(dirst == NULL){
691
if (errno == EBADF){
692
perror("readdir");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
695
}
696
break;
697
}
698
699
d_name_len = strlen(dirst->d_name);
700
701
/* Ignore dotfiles, backup files and other junk */
702
{
703
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
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
750
if(ret < 0){
751
perror("asprintf");
752
continue;
753
}
754
755
ret = stat(filename, &st);
756
if (ret == -1){
757
perror("stat");
758
free(filename);
759
continue;
760
}
761
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
898
continue;
899
}
900
762
901
/* Ignore non-executable files */
763
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
902
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
764
905
if(debug){
765
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
766
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
767
910
}
768
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
769
913
continue;
770
914
}
771
915
772
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
773
917
if(p == NULL){
774
perror("getplugin");
775
free(filename);
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
776
921
continue;
777
922
}
778
923
if(p->disabled){
779
924
if(debug){
780
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
781
dirst->d_name);
926
direntries[i]->d_name);
782
927
}
783
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
784
930
continue;
785
931
}
786
932
{
789
935
if(g != NULL){
790
936
for(char **a = g->argv + 1; *a != NULL; a++){
791
937
if(not add_argument(p, *a)){
792
perror("add_argument");
938
error(0, errno, "add_argument");
793
939
}
794
940
}
795
941
/* Add global environment variables */
796
942
for(char **e = g->environ; *e != NULL; e++){
797
943
if(not add_environment(p, *e, false)){
798
perror("add_environment");
944
error(0, errno, "add_environment");
799
945
}
800
946
}
801
947
}
802
948
}
803
/* If this plugin has any environment variables, we will call
804
using execve and need to duplicate the environment from this
805
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
806
951
if(p->environ[0] != NULL){
807
952
for(char **e = environ; *e != NULL; e++){
808
953
if(not add_environment(p, *e, false)){
809
perror("add_environment");
954
error(0, errno, "add_environment");
810
955
}
811
956
}
812
957
}
813
958
814
959
int pipefd[2];
815
ret = pipe(pipefd);
816
if (ret == -1){
817
perror("pipe");
818
exitstatus = EXIT_FAILURE;
819
goto fallback;
820
}
960
#ifndef O_CLOEXEC
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
965
if(ret == -1){
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
821
981
/* Ask OS to automatic close the pipe on exec */
822
982
ret = set_cloexec_flag(pipefd[0]);
823
983
if(ret < 0){
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
826
989
goto fallback;
827
990
}
828
991
ret = set_cloexec_flag(pipefd[1]);
829
992
if(ret < 0){
830
perror("set_cloexec_flag");
831
exitstatus = EXIT_FAILURE;
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
832
998
goto fallback;
833
999
}
1000
#endif /* not O_CLOEXEC */
834
1001
/* Block SIGCHLD until process is safely in process list */
835
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));
836
1005
if(ret < 0){
837
perror("sigprocmask");
838
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
839
1009
goto fallback;
840
1010
}
841
1011
/* Starting a new process to be watched */
842
pid_t pid = fork();
1012
pid_t pid;
1013
do {
1014
pid = fork();
1015
} while(pid == -1 and errno == EINTR);
843
1016
if(pid == -1){
844
perror("fork");
845
exitstatus = EXIT_FAILURE;
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
846
1024
goto fallback;
847
1025
}
848
1026
if(pid == 0){
849
1027
/* this is the child process */
850
1028
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
851
1029
if(ret < 0){
852
perror("sigaction");
853
_exit(EXIT_FAILURE);
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
854
1032
}
855
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1033
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
1034
if(ret < 0){
857
perror("sigprocmask");
858
_exit(EXIT_FAILURE);
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
859
1037
}
860
1038
861
1039
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
1040
if(ret == -1){
863
perror("dup2");
864
_exit(EXIT_FAILURE);
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
865
1043
}
866
1044
867
if(dirfd(dir) < 0){
868
/* If dir has no file descriptor, we could not set FD_CLOEXEC
869
above and must now close it manually here. */
870
closedir(dir);
871
}
872
if(p->environ[0] == NULL){
873
if(execv(filename, p->argv) < 0){
874
perror("execv");
875
_exit(EXIT_FAILURE);
876
}
877
} else {
878
if(execve(filename, p->argv, p->environ) < 0){
879
perror("execve");
880
_exit(EXIT_FAILURE);
881
}
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
882
1051
}
883
1052
/* no return */
884
1053
}
885
1054
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
887
free(filename);
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
891
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1061
ret = (int)(TEMP_FAILURE_RETRY
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
NULL)));
892
1064
if(ret < 0){
893
perror("sigprocmask");
1065
error(0, errno, "sigprocmask");
894
1066
}
895
exitstatus = EXIT_FAILURE;
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
896
1069
goto fallback;
897
1070
}
1071
free(direntries[i]);
898
1072
899
1073
new_plugin->pid = pid;
900
1074
new_plugin->fd = pipefd[0];
901
1075
902
1076
/* Unblock SIGCHLD so signal handler can be run if this process
903
1077
has already completed */
904
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
905
1081
if(ret < 0){
906
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
908
1084
goto fallback;
909
1085
}
910
1086
911
FD_SET(new_plugin->fd, &rfds_all);
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
912
1101
913
if (maxfd < new_plugin->fd){
1102
if(maxfd < new_plugin->fd){
914
1103
maxfd = new_plugin->fd;
915
1104
}
916
917
1105
}
918
1106
919
closedir(dir);
920
dir = NULL;
921
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1111
free_plugin(getplugin(NULL));
1112
922
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
1114
if(p->pid != 0){
924
1115
break;
929
1120
free_plugin_list();
930
1121
}
931
1122
}
932
1123
933
1124
/* Main loop while running plugins exist */
934
1125
while(plugin_list){
935
1126
fd_set rfds = rfds_all;
936
1127
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
if (select_ret == -1){
938
perror("select");
939
exitstatus = EXIT_FAILURE;
1128
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
940
1131
goto fallback;
941
1132
}
942
1133
/* OK, now either a process completed, or something can be read
943
1134
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1135
for(plugin *proc = plugin_list; proc != NULL;){
945
1136
/* Is this process completely done? */
946
if(proc->eof and proc->completed){
1137
if(proc->completed and proc->eof){
947
1138
/* Only accept the plugin output if it exited cleanly */
948
1139
if(not WIFEXITED(proc->status)
949
1140
or WEXITSTATUS(proc->status) != 0){
950
1141
/* Bad exit by plugin */
951
1142
952
1143
if(debug){
953
1144
if(WIFEXITED(proc->status)){
954
fprintf(stderr, "Plugin %u exited with status %d\n",
955
(unsigned int) (proc->pid),
1145
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1146
" status %d\n", proc->name,
1147
(intmax_t) (proc->pid),
956
1148
WEXITSTATUS(proc->status));
957
} else if(WIFSIGNALED(proc->status)) {
958
fprintf(stderr, "Plugin %u killed by signal %d\n",
959
(unsigned int) (proc->pid),
960
WTERMSIG(proc->status));
1149
} else if(WIFSIGNALED(proc->status)){
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1151
" signal %d: %s\n", proc->name,
1152
(intmax_t) (proc->pid),
1153
WTERMSIG(proc->status),
1154
strsignal(WTERMSIG(proc->status)));
961
1155
} else if(WCOREDUMP(proc->status)){
962
fprintf(stderr, "Plugin %d dumped core\n",
963
(unsigned int) (proc->pid));
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
964
1158
}
965
1159
}
966
1160
967
1161
/* Remove the plugin */
968
FD_CLR(proc->fd, &rfds_all);
969
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1176
970
1177
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
972
1182
if(ret < 0){
973
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
975
1185
goto fallback;
976
1186
}
1187
1188
plugin *next_plugin = proc->next;
977
1189
free_plugin(proc);
1190
proc = next_plugin;
1191
978
1192
/* We are done modifying process list, so unblock signal */
979
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
NULL);
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
981
1196
if(ret < 0){
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
984
1199
goto fallback;
985
1200
}
986
1201
987
1202
if(plugin_list == NULL){
988
1203
break;
989
1204
}
1205
990
1206
continue;
991
1207
}
992
1208
993
1209
/* This process exited nicely, so print its buffer */
994
1210
995
1211
bool bret = print_out_password(proc->buffer,
996
1212
proc->buffer_length);
997
1213
if(not bret){
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
1000
1216
}
1001
1217
goto fallback;
1002
1218
}
1003
1219
1004
1220
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
warning from
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1006
1238
/* This process had nothing to say at this time */
1239
proc = proc->next;
1007
1240
continue;
1008
1241
}
1009
1242
/* Before reading, make the process' data buffer large enough */
1010
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1011
proc->buffer = realloc(proc->buffer, proc->buffer_size
1012
+ (size_t) BUFFER_SIZE);
1013
if (proc->buffer == NULL){
1014
perror("malloc");
1015
exitstatus = EXIT_FAILURE;
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1016
1249
goto fallback;
1017
1250
}
1251
proc->buffer = new_buffer;
1018
1252
proc->buffer_size += BUFFER_SIZE;
1019
1253
}
1020
1254
/* Read from the process */
1021
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
BUFFER_SIZE);
1023
if(ret < 0){
1255
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1256
proc->buffer
1257
+ proc->buffer_length,
1258
BUFFER_SIZE));
1259
if(sret < 0){
1024
1260
/* Read error from this process; ignore the error */
1261
proc = proc->next;
1025
1262
continue;
1026
1263
}
1027
if(ret == 0){
1264
if(sret == 0){
1028
1265
/* got EOF */
1029
1266
proc->eof = true;
1030
1267
} else {
1031
proc->buffer_length += (size_t) ret;
1268
proc->buffer_length += (size_t) sret;
1032
1269
}
1033
1270
}
1034
1271
}
1035
1036
1272
1273
1037
1274
fallback:
1038
1275
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1040
1278
/* Fallback if all plugins failed, none are found or an error
1041
1279
occured */
1042
1280
bool bret;
1050
1288
}
1051
1289
bret = print_out_password(passwordbuffer, len);
1052
1290
if(not bret){
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
1055
1293
}
1056
1294
}
1057
1295
1058
1296
/* Restore old signal handler */
1059
1297
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1060
1298
if(ret == -1){
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1063
1301
}
1064
1302
1065
1303
if(custom_argv != NULL){
1066
1304
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1067
1305
free(*arg);
1069
1307
free(custom_argv);
1070
1308
}
1071
1309
1072
if(dir != NULL){
1073
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1074
1314
}
1075
1315
1076
/* Free the process list and kill the processes */
1316
/* Kill the processes */
1077
1317
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
1318
if(p->pid != 0){
1079
1319
close(p->fd);
1080
1320
ret = kill(p->pid, SIGTERM);
1081
1321
if(ret == -1 and errno != ESRCH){
1082
1322
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1323
error(0, errno, "kill");
1084
1324
}
1085
1325
}
1086
1326
}
1087
1327
1088
1328
/* Wait for any remaining child processes to terminate */
1089
do{
1329
do {
1090
1330
ret = wait(NULL);
1091
1331
} while(ret >= 0);
1092
1332
if(errno != ECHILD){
1093
perror("wait");
1333
error(0, errno, "wait");
1094
1334
}
1095
1335
1096
1336
free_plugin_list();
1097
1337
1098
1338
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0