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- Committer: Teddy Hogeborn
- Date: 2009-01-27 00:07:26 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090127000726-4cafcfy35g8kh2b8
* INSTALL (Prerequisites/Mandos Server): Added "PyGObject".
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
42
27
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
63
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
89
68
90
69
#define BUFFER_SIZE 256
91
70
92
71
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
73
96
74
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
98
76
99
77
typedef struct plugin{
100
78
char *name; /* can be NULL or any plugin name */
103
81
char **environ;
104
82
int envc;
105
83
bool disabled;
106
84
107
85
/* Variables used for running processes*/
108
86
pid_t pid;
109
87
int fd;
111
89
size_t buffer_size;
112
90
size_t buffer_length;
113
91
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
92
volatile bool completed;
93
volatile int status;
116
94
struct plugin *next;
117
95
} plugin;
118
96
120
98
121
99
/* Gets an existing plugin based on name,
122
100
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
101
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
126
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
104
if((p->name == name)
128
105
or (p->name and name and (strcmp(p->name, name) == 0))){
130
107
}
131
108
}
132
109
/* Create a new plugin */
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
137
111
if(new_plugin == NULL){
138
112
return NULL;
139
113
}
140
114
char *copy_name = NULL;
141
115
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
145
117
if(copy_name == NULL){
146
int e = errno;
147
118
free(new_plugin);
148
errno = e;
149
119
return NULL;
150
120
}
151
121
}
152
122
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
157
127
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
161
129
if(new_plugin->argv == NULL){
162
int e = errno;
163
130
free(copy_name);
164
131
free(new_plugin);
165
errno = e;
166
132
return NULL;
167
133
}
168
134
new_plugin->argv[0] = copy_name;
169
135
new_plugin->argv[1] = NULL;
170
136
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
174
138
if(new_plugin->environ == NULL){
175
int e = errno;
176
139
free(copy_name);
177
140
free(new_plugin->argv);
178
141
free(new_plugin);
179
errno = e;
180
142
return NULL;
181
143
}
182
144
new_plugin->environ[0] = NULL;
187
149
}
188
150
189
151
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
152
static bool add_to_char_array(const char *new, char ***array,
192
153
int *len){
193
154
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
210
157
/* Malloc check */
211
if(new_array == NULL){
158
if(*array == NULL){
212
159
return false;
213
160
}
214
*array = new_array;
215
161
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
220
163
if(copy == NULL){
221
164
return false;
222
165
}
229
172
}
230
173
231
174
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
175
static bool add_argument(plugin *p, const char *arg){
234
176
if(p == NULL){
235
177
return false;
238
180
}
239
181
240
182
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
183
static bool add_environment(plugin *p, const char *def, bool replace){
243
184
if(p == NULL){
244
185
return false;
246
187
/* namelen = length of name of environment variable */
247
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
189
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
251
192
/* It already exists */
252
193
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
258
196
return false;
259
197
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
262
200
}
263
201
return true;
264
202
}
266
204
return add_to_char_array(def, &(p->environ), &(p->envc));
267
205
}
268
206
269
#ifndef O_CLOEXEC
270
207
/*
271
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
209
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
211
*/
275
__attribute__((warn_unused_result))
276
212
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
278
214
/* If reading the flags failed, return error indication now. */
279
215
if(ret < 0){
280
216
return ret;
281
217
}
282
218
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
220
}
286
#endif /* not O_CLOEXEC */
287
221
288
222
289
223
/* Mark processes as completed when they exit, and save their exit
290
224
status. */
291
225
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
293
226
while(true){
294
227
plugin *proc = plugin_list;
295
228
int status;
299
232
break;
300
233
}
301
234
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
235
if(errno != ECHILD){
236
perror("waitpid");
305
237
}
306
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
307
240
}
308
241
309
242
/* A child exited, find it in process_list */
315
248
continue;
316
249
}
317
250
proc->status = status;
318
proc->completed = 1;
251
proc->completed = true;
319
252
}
320
errno = old_errno;
321
253
}
322
254
323
255
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
256
static bool print_out_password(const char *buffer, size_t length){
326
257
ssize_t ret;
327
258
for(size_t written = 0; written < length; written += (size_t)ret){
335
266
}
336
267
337
268
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
269
static void free_plugin(plugin *plugin_node){
340
270
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
272
free(*arg);
343
273
}
344
free(plugin_node->name);
345
274
free(plugin_node->argv);
346
275
for(char **env = plugin_node->environ; *env != NULL; env++){
347
276
free(*env);
348
277
}
349
278
free(plugin_node->environ);
350
279
free(plugin_node->buffer);
351
280
352
281
/* Removes the plugin from the singly-linked list */
353
282
if(plugin_node == plugin_list){
354
283
/* First one - simple */
374
303
375
304
int main(int argc, char *argv[]){
376
305
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
306
char *argfile = NULL;
379
307
FILE *conffp;
380
struct dirent **direntries = NULL;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
381
311
struct stat st;
382
312
fd_set rfds_all;
383
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
384
314
ssize_t sret;
315
intmax_t tmpmax;
385
316
uid_t uid = 65534;
386
317
gid_t gid = 65534;
387
318
bool debug = false;
391
322
.sa_flags = SA_NOCLDSTOP };
392
323
char **custom_argv = NULL;
393
324
int custom_argc = 0;
394
int dir_fd = -1;
395
325
396
326
/* Establish a signal handler */
397
327
sigemptyset(&sigchld_action.sa_mask);
398
328
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
329
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
402
332
goto fallback;
403
333
}
404
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
335
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
408
338
goto fallback;
409
339
}
410
340
442
372
.doc = "Group ID the plugins will run as", .group = 3 },
443
373
{ .name = "debug", .key = 132,
444
374
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
458
375
{ .name = NULL }
459
376
};
460
377
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
467
381
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
382
if(arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
473
391
}
474
392
}
475
errno = 0;
476
393
}
477
394
break;
478
395
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
481
401
}
482
402
break;
483
403
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
404
if(arg != NULL){
405
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
407
break;
408
}
409
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
411
break;
412
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
421
}
422
}
505
423
}
506
424
break;
507
425
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
508
429
{
509
430
char *envdef = strchr(arg, ':');
510
431
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
432
break;
514
433
}
515
434
*envdef = '\0';
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
perror("add_environment");
524
437
}
525
438
}
526
439
break;
527
440
case 'd': /* --disable */
528
{
441
if(arg != NULL){
529
442
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
533
445
}
446
p->disabled = true;
534
447
}
535
448
break;
536
449
case 'e': /* --enable */
537
{
450
if(arg != NULL){
538
451
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
542
454
}
455
p->disabled = false;
543
456
}
544
457
break;
545
458
case 128: /* --plugin-dir */
546
459
free(plugindir);
547
460
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
461
if(plugindir == NULL){
462
perror("strdup");
463
}
551
464
break;
552
465
case 129: /* --config-file */
553
466
/* This is already done by parse_opt_config_file() */
554
467
break;
555
468
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
562
476
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
565
477
break;
566
478
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
573
486
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
576
487
break;
577
488
case 132: /* --debug */
578
489
debug = true;
579
490
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
491
/*
604
492
* When adding more options before this line, remember to also add a
605
493
* "case" to the "parse_opt_config_file" function below.
608
496
/* Cryptsetup always passes an argument, which is an empty
609
497
string if "none" was specified in /etc/crypttab. So if
610
498
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
613
501
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
502
break;
503
case ARGP_KEY_END:
504
break;
619
505
default:
620
506
return ARGP_ERR_UNKNOWN;
621
507
}
622
return errno; /* Set to 0 at start */
508
return 0;
623
509
}
624
510
625
511
/* This option parser is the same as parse_opt() above, except it
626
512
ignores everything but the --config-file option. */
627
513
error_t parse_opt_config_file(int key, char *arg,
628
514
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
515
struct argp_state *state) {
516
switch(key) {
632
517
case 'g': /* --global-options */
633
518
case 'G': /* --global-env */
634
519
case 'o': /* --options-for */
640
525
case 129: /* --config-file */
641
526
free(argfile);
642
527
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
528
if(argfile == NULL){
529
perror("strdup");
645
530
}
646
break;
531
break;
647
532
case 130: /* --userid */
648
533
case 131: /* --groupid */
649
534
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
655
537
break;
656
538
default:
657
539
return ARGP_ERR_UNKNOWN;
658
540
}
659
return errno;
541
return 0;
660
542
}
661
543
662
544
struct argp argp = { .options = options,
666
548
667
549
/* Parse using parse_opt_config_file() in order to get the custom
668
550
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
553
fprintf(stderr, "Unknown error while parsing arguments\n");
554
exitstatus = EXIT_FAILURE;
683
555
goto fallback;
684
556
}
685
557
691
563
conffp = fopen(AFILE, "r");
692
564
} else {
693
565
conffp = fopen(argfile, "r");
694
}
566
}
695
567
if(conffp != NULL){
696
568
char *org_line = NULL;
697
569
char *p, *arg, *new_arg, *line;
698
570
size_t size = 0;
699
571
const char whitespace_delims[] = " \r\t\f\v\n";
700
572
const char comment_delim[] = "#";
701
573
702
574
custom_argc = 1;
703
575
custom_argv = malloc(sizeof(char*) * 2);
704
576
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
707
579
goto fallback;
708
580
}
709
581
custom_argv[0] = argv[0];
710
582
custom_argv[1] = NULL;
711
583
712
584
/* for each line in the config file, strip whitespace and ignore
713
585
commented text */
714
586
while(true){
716
588
if(sret == -1){
717
589
break;
718
590
}
719
591
720
592
line = org_line;
721
593
arg = strsep(&line, comment_delim);
722
594
while((p = strsep(&arg, whitespace_delims)) != NULL){
725
597
}
726
598
new_arg = strdup(p);
727
599
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
730
602
free(org_line);
731
603
goto fallback;
732
604
}
733
605
734
606
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
759
614
}
760
615
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
616
custom_argv[custom_argc] = NULL;
762
617
}
763
618
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
772
619
free(org_line);
773
620
} else {
774
621
/* Check for harmful errors and go to fallback. Other errors might
775
622
not affect opening plugins */
776
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
779
626
goto fallback;
780
627
}
781
628
}
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
784
631
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
635
fprintf(stderr, "Unknown error while parsing arguments\n");
636
exitstatus = EXIT_FAILURE;
799
637
goto fallback;
800
638
}
801
639
}
802
640
803
641
/* Parse actual command line arguments, to let them override the
804
642
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
838
648
}
839
649
840
650
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
653
p->name ? p->name : "Global", p->argc - 1);
844
654
for(char **a = p->argv; *a != NULL; a++){
851
661
}
852
662
}
853
663
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
664
/* Strip permissions down to nobody */
892
665
ret = setuid(uid);
893
666
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
667
perror("setuid");
668
}
669
setgid(gid);
670
if(ret == -1){
671
perror("setgid");
672
}
673
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
680
if(dir == NULL){
681
perror("Could not open plugin dir");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
685
686
/* Set the FD_CLOEXEC flag on the directory, if possible */
898
687
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
688
int dir_fd = dirfd(dir);
689
if(dir_fd >= 0){
690
ret = set_cloexec_flag(dir_fd);
691
if(ret < 0){
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
694
goto fallback;
943
695
}
944
696
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
697
}
956
698
957
699
FD_ZERO(&rfds_all);
958
700
959
701
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
702
while(true){
703
dirst = readdir(dir);
704
705
/* All directory entries have been processed */
706
if(dirst == NULL){
707
if(errno == EBADF){
708
perror("readdir");
709
exitstatus = EXIT_FAILURE;
710
goto fallback;
711
}
712
break;
713
}
714
715
d_name_len = strlen(dirst->d_name);
716
717
/* Ignore dotfiles, backup files and other junk */
718
{
719
bool bad_name = false;
720
721
const char const *bad_prefixes[] = { ".", "#", NULL };
722
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
".dpkg-old",
725
".dpkg-bak",
726
".dpkg-divert", NULL };
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
size_t pre_len = strlen(*pre);
729
if((d_name_len >= pre_len)
730
and strncmp((dirst->d_name), *pre, pre_len) == 0){
731
if(debug){
732
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
733
" with bad prefix %s\n", dirst->d_name, *pre);
734
}
735
bad_name = true;
736
break;
737
}
738
}
739
if(bad_name){
740
continue;
741
}
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
size_t suf_len = strlen(*suf);
744
if((d_name_len >= suf_len)
745
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
746
== 0)){
747
if(debug){
748
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
749
" with bad suffix %s\n", dirst->d_name, *suf);
750
}
751
bad_name = true;
752
break;
753
}
754
}
755
756
if(bad_name){
757
continue;
758
}
759
}
760
761
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
767
if(ret < 0){
768
perror("asprintf");
966
769
continue;
967
770
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
771
772
ret = stat(filename, &st);
969
773
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
774
perror("stat");
775
free(filename);
973
776
continue;
974
777
}
975
778
976
779
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
980
781
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" with bad type or mode\n", filename);
985
784
}
986
close(plugin_fd);
987
free(direntries[i]);
785
free(filename);
988
786
continue;
989
787
}
990
788
991
plugin *p = getplugin(direntries[i]->d_name);
789
plugin *p = getplugin(dirst->d_name);
992
790
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
791
perror("getplugin");
792
free(filename);
996
793
continue;
997
794
}
998
795
if(p->disabled){
999
796
if(debug){
1000
797
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
798
dirst->d_name);
1002
799
}
1003
close(plugin_fd);
1004
free(direntries[i]);
800
free(filename);
1005
801
continue;
1006
802
}
1007
803
{
1010
806
if(g != NULL){
1011
807
for(char **a = g->argv + 1; *a != NULL; a++){
1012
808
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
809
perror("add_argument");
1014
810
}
1015
811
}
1016
812
/* Add global environment variables */
1017
813
for(char **e = g->environ; *e != NULL; e++){
1018
814
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
815
perror("add_environment");
1020
816
}
1021
817
}
1022
818
}
1023
819
}
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
820
/* If this plugin has any environment variables, we will call
821
using execve and need to duplicate the environment from this
822
process, too. */
1026
823
if(p->environ[0] != NULL){
1027
824
for(char **e = environ; *e != NULL; e++){
1028
825
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
826
perror("add_environment");
1030
827
}
1031
828
}
1032
829
}
1033
830
1034
831
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
832
ret = pipe(pipefd);
1040
833
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
836
goto fallback;
837
}
1056
838
/* Ask OS to automatic close the pipe on exec */
1057
839
ret = set_cloexec_flag(pipefd[0]);
1058
840
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
1064
843
goto fallback;
1065
844
}
1066
845
ret = set_cloexec_flag(pipefd[1]);
1067
846
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
1073
849
goto fallback;
1074
850
}
1075
#endif /* not O_CLOEXEC */
1076
851
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1080
853
if(ret < 0){
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1084
856
goto fallback;
1085
857
}
1086
858
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
859
pid_t pid = fork();
1091
860
if(pid == -1){
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
1099
863
goto fallback;
1100
864
}
1101
865
if(pid == 0){
1102
866
/* this is the child process */
1103
867
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
868
if(ret < 0){
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1107
871
}
1108
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
873
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1112
876
}
1113
877
1114
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
879
if(ret == -1){
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1118
882
}
1119
883
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
884
if(dirfd(dir) < 0){
885
/* If dir has no file descriptor, we could not set FD_CLOEXEC
886
above and must now close it manually here. */
887
closedir(dir);
888
}
889
if(p->environ[0] == NULL){
890
if(execv(filename, p->argv) < 0){
891
perror("execv");
892
_exit(EXIT_FAILURE);
893
}
894
} else {
895
if(execve(filename, p->argv, p->environ) < 0){
896
perror("execve");
897
_exit(EXIT_FAILURE);
898
}
1126
899
}
1127
900
/* no return */
1128
901
}
1129
902
/* Parent process */
1130
903
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
904
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
1133
906
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1138
909
if(ret < 0){
1139
error(0, errno, "sigprocmask");
910
perror("sigprocmask");
1140
911
}
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
912
exitstatus = EXIT_FAILURE;
1143
913
goto fallback;
1144
914
}
1145
free(direntries[i]);
1146
915
1147
916
new_plugin->pid = pid;
1148
917
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
918
1155
919
/* Unblock SIGCHLD so signal handler can be run if this process
1156
920
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1160
922
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1163
925
goto fallback;
1164
926
}
1165
927
1170
932
}
1171
933
}
1172
934
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
935
closedir(dir);
936
dir = NULL;
1178
937
1179
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
939
if(p->pid != 0){
1191
950
while(plugin_list){
1192
951
fd_set rfds = rfds_all;
1193
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1197
956
goto fallback;
1198
957
}
1199
958
/* OK, now either a process completed, or something can be read
1200
959
from one of them */
1201
960
for(plugin *proc = plugin_list; proc != NULL;){
1202
961
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
962
if(proc->eof and proc->completed){
1204
963
/* Only accept the plugin output if it exited cleanly */
1205
964
if(not WIFEXITED(proc->status)
1206
965
or WEXITSTATUS(proc->status) != 0){
1207
966
/* Bad exit by plugin */
1208
967
1209
968
if(debug){
1210
969
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1214
972
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
973
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
976
WTERMSIG(proc->status));
977
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
1221
980
}
1222
981
}
1223
982
1224
983
/* Remove the plugin */
1225
984
FD_CLR(proc->fd, &rfds_all);
1226
985
1227
986
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1232
988
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1235
991
goto fallback;
1236
992
}
1237
993
1240
996
proc = next_plugin;
1241
997
1242
998
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1246
1001
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1249
1004
goto fallback;
1250
1005
}
1251
1006
1261
1016
bool bret = print_out_password(proc->buffer,
1262
1017
proc->buffer_length);
1263
1018
if(not bret){
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1266
1021
}
1267
1022
goto fallback;
1268
1023
}
1275
1030
}
1276
1031
/* Before reading, make the process' data buffer large enough */
1277
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
1036
perror("malloc");
1037
exitstatus = EXIT_FAILURE;
1283
1038
goto fallback;
1284
1039
}
1285
proc->buffer = new_buffer;
1286
1040
proc->buffer_size += BUFFER_SIZE;
1287
1041
}
1288
1042
/* Read from the process */
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1293
1045
if(sret < 0){
1294
1046
/* Read error from this process; ignore the error */
1295
1047
proc = proc->next;
1303
1055
}
1304
1056
}
1305
1057
}
1306
1307
1058
1059
1308
1060
fallback:
1309
1061
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1312
1063
/* Fallback if all plugins failed, none are found or an error
1313
1064
occured */
1314
1065
bool bret;
1322
1073
}
1323
1074
bret = print_out_password(passwordbuffer, len);
1324
1075
if(not bret){
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1327
1078
}
1328
1079
}
1329
1080
1330
1081
/* Restore old signal handler */
1331
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
1083
if(ret == -1){
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1335
1086
}
1336
1087
1337
1088
if(custom_argv != NULL){
1341
1092
free(custom_argv);
1342
1093
}
1343
1094
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1095
if(dir != NULL){
1096
closedir(dir);
1348
1097
}
1349
1098
1350
1099
/* Kill the processes */
1354
1103
ret = kill(p->pid, SIGTERM);
1355
1104
if(ret == -1 and errno != ESRCH){
1356
1105
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1106
perror("kill");
1358
1107
}
1359
1108
}
1360
1109
}
1361
1110
1362
1111
/* Wait for any remaining child processes to terminate */
1363
do {
1112
do{
1364
1113
ret = wait(NULL);
1365
1114
} while(ret >= 0);
1366
1115
if(errno != ECHILD){
1367
error(0, errno, "wait");
1116
perror("wait");
1368
1117
}
1369
1118
1370
1119
free_plugin_list();
1371
1120
1372
1121
free(plugindir);
1373
free(pluginhelperdir);
1374
1122
free(argfile);
1375
1123
1376
1124
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0