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- Committer: Teddy Hogeborn
- Date: 2021-02-04 17:57:58 UTC
- mto: This revision was merged to the branch mainline in revision 406.
- Revision ID: teddy@recompile.se-20210204175758-t9gywlxuhe1nseqo
dracut-module/password-agent.c: Add extra diagnostic info
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): If send() fails, also show
the message size.
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): If send() fails, also show
the message size.
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 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
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
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() */
27
42
#include <stddef.h> /* size_t, NULL */
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() */
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() */
53
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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(), sig_atomic_t
66
*/
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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 */
69
89
70
90
#define BUFFER_SIZE 256
71
91
72
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
73
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
95
75
96
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
77
98
78
99
typedef struct plugin{
79
100
char *name; /* can be NULL or any plugin name */
82
103
char **environ;
83
104
int envc;
84
105
bool disabled;
85
106
86
107
/* Variables used for running processes*/
87
108
pid_t pid;
88
109
int fd;
99
120
100
121
/* Gets an existing plugin based on name,
101
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
102
124
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
125
/* Check for existing plugin with that name */
104
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
127
if((p->name == name)
106
128
or (p->name and name and (strcmp(p->name, name) == 0))){
108
130
}
109
131
}
110
132
/* Create a new plugin */
111
plugin *new_plugin = malloc(sizeof(plugin));
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
112
137
if(new_plugin == NULL){
113
138
return NULL;
114
139
}
115
140
char *copy_name = NULL;
116
141
if(name != NULL){
117
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
118
145
if(copy_name == NULL){
146
int e = errno;
119
147
free(new_plugin);
148
errno = e;
120
149
return NULL;
121
150
}
122
151
}
126
155
.disabled = false,
127
156
.next = plugin_list };
128
157
129
new_plugin->argv = malloc(sizeof(char *) * 2);
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
130
161
if(new_plugin->argv == NULL){
162
int e = errno;
131
163
free(copy_name);
132
164
free(new_plugin);
165
errno = e;
133
166
return NULL;
134
167
}
135
168
new_plugin->argv[0] = copy_name;
136
169
new_plugin->argv[1] = NULL;
137
170
138
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
139
174
if(new_plugin->environ == NULL){
175
int e = errno;
140
176
free(copy_name);
141
177
free(new_plugin->argv);
142
178
free(new_plugin);
179
errno = e;
143
180
return NULL;
144
181
}
145
182
new_plugin->environ[0] = NULL;
150
187
}
151
188
152
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
153
191
static bool add_to_char_array(const char *new, char ***array,
154
192
int *len){
155
193
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
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);
158
210
/* Malloc check */
159
if(*array == NULL){
211
if(new_array == NULL){
160
212
return false;
161
213
}
214
*array = new_array;
162
215
/* Make a copy of the new string */
163
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
164
220
if(copy == NULL){
165
221
return false;
166
222
}
173
229
}
174
230
175
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
176
233
static bool add_argument(plugin *p, const char *arg){
177
234
if(p == NULL){
178
235
return false;
181
238
}
182
239
183
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
184
242
static bool add_environment(plugin *p, const char *def, bool replace){
185
243
if(p == NULL){
186
244
return false;
188
246
/* namelen = length of name of environment variable */
189
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
248
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
193
251
/* It already exists */
194
252
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
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){
197
258
return false;
198
259
}
199
*e = new;
200
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
201
262
}
202
263
return true;
203
264
}
205
266
return add_to_char_array(def, &(p->environ), &(p->envc));
206
267
}
207
268
269
#ifndef O_CLOEXEC
208
270
/*
209
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
272
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
274
*/
275
__attribute__((warn_unused_result))
213
276
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
278
/* If reading the flags failed, return error indication now. */
216
279
if(ret < 0){
217
280
return ret;
218
281
}
219
282
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
221
285
}
286
#endif /* not O_CLOEXEC */
222
287
223
288
224
289
/* Mark processes as completed when they exit, and save their exit
238
303
/* No child processes */
239
304
break;
240
305
}
241
perror("waitpid");
306
error(0, errno, "waitpid");
242
307
}
243
308
244
309
/* A child exited, find it in process_list */
256
321
}
257
322
258
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
259
325
static bool print_out_password(const char *buffer, size_t length){
260
326
ssize_t ret;
261
327
for(size_t written = 0; written < length; written += (size_t)ret){
269
335
}
270
336
271
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
272
339
static void free_plugin(plugin *plugin_node){
273
340
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
342
free(*arg);
276
343
}
344
free(plugin_node->name);
277
345
free(plugin_node->argv);
278
346
for(char **env = plugin_node->environ; *env != NULL; env++){
279
347
free(*env);
280
348
}
281
349
free(plugin_node->environ);
282
350
free(plugin_node->buffer);
283
351
284
352
/* Removes the plugin from the singly-linked list */
285
353
if(plugin_node == plugin_list){
286
354
/* First one - simple */
306
374
307
375
int main(int argc, char *argv[]){
308
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
309
378
char *argfile = NULL;
310
379
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
380
struct dirent **direntries = NULL;
314
381
struct stat st;
315
382
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
317
384
ssize_t sret;
318
intmax_t tmpmax;
319
385
uid_t uid = 65534;
320
386
gid_t gid = 65534;
321
387
bool debug = false;
325
391
.sa_flags = SA_NOCLDSTOP };
326
392
char **custom_argv = NULL;
327
393
int custom_argc = 0;
394
int dir_fd = -1;
328
395
329
396
/* Establish a signal handler */
330
397
sigemptyset(&sigchld_action.sa_mask);
331
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
399
if(ret == -1){
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
335
402
goto fallback;
336
403
}
337
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
405
if(ret == -1){
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
341
408
goto fallback;
342
409
}
343
410
375
442
.doc = "Group ID the plugins will run as", .group = 3 },
376
443
{ .name = "debug", .key = 132,
377
444
.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 },
378
458
{ .name = NULL }
379
459
};
380
460
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
383
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
384
467
case 'g': /* --global-options */
385
if(arg != NULL){
468
{
386
469
char *plugin_option;
387
470
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
471
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
472
break;
394
473
}
395
474
}
475
errno = 0;
396
476
}
397
477
break;
398
478
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
404
481
}
405
482
break;
406
483
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
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;
417
502
}
418
503
}
504
errno = 0;
419
505
}
420
506
break;
421
507
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
508
{
426
509
char *envdef = strchr(arg, ':');
427
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
428
513
break;
429
514
}
430
515
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
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;
433
524
}
434
525
}
435
526
break;
436
527
case 'd': /* --disable */
437
if(arg != NULL){
528
{
438
529
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
441
533
}
442
p->disabled = true;
443
534
}
444
535
break;
445
536
case 'e': /* --enable */
446
if(arg != NULL){
537
{
447
538
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
450
542
}
451
p->disabled = false;
452
543
}
453
544
break;
454
545
case 128: /* --plugin-dir */
455
546
free(plugindir);
456
547
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
460
551
break;
461
552
case 129: /* --config-file */
462
553
/* This is already done by parse_opt_config_file() */
463
554
break;
464
555
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
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;
472
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
473
565
break;
474
566
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
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;
482
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
483
576
break;
484
577
case 132: /* --debug */
485
578
debug = true;
486
579
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;
487
603
/*
488
604
* When adding more options before this line, remember to also add a
489
605
* "case" to the "parse_opt_config_file" function below.
492
608
/* Cryptsetup always passes an argument, which is an empty
493
609
string if "none" was specified in /etc/crypttab. So if
494
610
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
497
613
}
498
break;
499
case ARGP_KEY_END:
500
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
501
619
default:
502
620
return ARGP_ERR_UNKNOWN;
503
621
}
504
return 0;
622
return errno; /* Set to 0 at start */
505
623
}
506
624
507
625
/* This option parser is the same as parse_opt() above, except it
509
627
error_t parse_opt_config_file(int key, char *arg,
510
628
__attribute__((unused))
511
629
struct argp_state *state){
630
errno = 0;
512
631
switch(key){
513
632
case 'g': /* --global-options */
514
633
case 'G': /* --global-env */
521
640
case 129: /* --config-file */
522
641
free(argfile);
523
642
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
526
645
}
527
break;
646
break;
528
647
case 130: /* --userid */
529
648
case 131: /* --groupid */
530
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
531
654
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
655
break;
534
656
default:
535
657
return ARGP_ERR_UNKNOWN;
536
658
}
537
return 0;
659
return errno;
538
660
}
539
661
540
662
struct argp argp = { .options = options,
544
666
545
667
/* Parse using parse_opt_config_file() in order to get the custom
546
668
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
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
683
goto fallback;
552
684
}
553
685
559
691
conffp = fopen(AFILE, "r");
560
692
} else {
561
693
conffp = fopen(argfile, "r");
562
}
694
}
563
695
if(conffp != NULL){
564
696
char *org_line = NULL;
565
697
char *p, *arg, *new_arg, *line;
566
698
size_t size = 0;
567
699
const char whitespace_delims[] = " \r\t\f\v\n";
568
700
const char comment_delim[] = "#";
569
701
570
702
custom_argc = 1;
571
703
custom_argv = malloc(sizeof(char*) * 2);
572
704
if(custom_argv == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
575
707
goto fallback;
576
708
}
577
709
custom_argv[0] = argv[0];
578
710
custom_argv[1] = NULL;
579
711
580
712
/* for each line in the config file, strip whitespace and ignore
581
713
commented text */
582
714
while(true){
584
716
if(sret == -1){
585
717
break;
586
718
}
587
719
588
720
line = org_line;
589
721
arg = strsep(&line, comment_delim);
590
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
593
725
}
594
726
new_arg = strdup(p);
595
727
if(new_arg == NULL){
596
perror("strdup");
597
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
598
730
free(org_line);
599
731
goto fallback;
600
732
}
601
733
602
734
custom_argc += 1;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
606
perror("realloc");
607
exitstatus = EXIT_FAILURE;
608
free(org_line);
609
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
610
758
}
611
759
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
760
custom_argv[custom_argc] = NULL;
613
761
}
614
762
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
615
771
free(org_line);
616
772
} else {
617
773
/* Check for harmful errors and go to fallback. Other errors might
618
774
not affect opening plugins */
619
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
perror("fopen");
621
exitstatus = EXIT_FAILURE;
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
622
778
goto fallback;
623
779
}
624
780
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
627
783
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
633
798
goto fallback;
634
799
}
635
800
}
636
801
637
802
/* Parse actual command line arguments, to let them override the
638
803
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
643
goto fallback;
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
644
837
}
645
838
646
839
if(debug){
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
648
841
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
842
p->name ? p->name : "Global", p->argc - 1);
650
843
for(char **a = p->argv; *a != NULL; a++){
657
850
}
658
851
}
659
852
660
/* Strip permissions down to nobody */
661
setgid(gid);
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
662
888
if(ret == -1){
663
perror("setgid");
889
error(0, errno, "setgid");
664
890
}
665
891
ret = setuid(uid);
666
892
if(ret == -1){
667
perror("setuid");
668
}
669
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
683
897
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
691
942
}
692
943
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
693
954
}
694
955
695
956
FD_ZERO(&rfds_all);
696
957
697
958
/* Read and execute any executable in the plugin directory*/
698
while(true){
699
dirst = readdir(dir);
700
701
/* All directory entries have been processed */
702
if(dirst == NULL){
703
if(errno == EBADF){
704
perror("readdir");
705
exitstatus = EXIT_FAILURE;
706
goto fallback;
707
}
708
break;
709
}
710
711
d_name_len = strlen(dirst->d_name);
712
713
/* Ignore dotfiles, backup files and other junk */
714
{
715
bool bad_name = false;
716
717
const char const *bad_prefixes[] = { ".", "#", NULL };
718
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
720
".dpkg-old",
721
".dpkg-bak",
722
".dpkg-divert", NULL };
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
size_t pre_len = strlen(*pre);
725
if((d_name_len >= pre_len)
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad prefix %s\n", dirst->d_name, *pre);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
if(bad_name){
736
continue;
737
}
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
size_t suf_len = strlen(*suf);
740
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
742
== 0)){
743
if(debug){
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
745
" with bad suffix %s\n", dirst->d_name, *suf);
746
}
747
bad_name = true;
748
break;
749
}
750
}
751
752
if(bad_name){
753
continue;
754
}
755
}
756
757
char *filename;
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
762
}
763
if(ret < 0){
764
perror("asprintf");
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
765
965
continue;
766
966
}
767
768
ret = stat(filename, &st);
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
769
968
if(ret == -1){
770
perror("stat");
771
free(filename);
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
772
972
continue;
773
973
}
774
974
775
975
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
777
979
if(debug){
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
" with bad type or mode\n", filename);
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
780
984
}
781
free(filename);
985
close(plugin_fd);
986
free(direntries[i]);
782
987
continue;
783
988
}
784
989
785
plugin *p = getplugin(dirst->d_name);
990
plugin *p = getplugin(direntries[i]->d_name);
786
991
if(p == NULL){
787
perror("getplugin");
788
free(filename);
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
789
995
continue;
790
996
}
791
997
if(p->disabled){
792
998
if(debug){
793
999
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
794
dirst->d_name);
1000
direntries[i]->d_name);
795
1001
}
796
free(filename);
1002
close(plugin_fd);
1003
free(direntries[i]);
797
1004
continue;
798
1005
}
799
1006
{
802
1009
if(g != NULL){
803
1010
for(char **a = g->argv + 1; *a != NULL; a++){
804
1011
if(not add_argument(p, *a)){
805
perror("add_argument");
1012
error(0, errno, "add_argument");
806
1013
}
807
1014
}
808
1015
/* Add global environment variables */
809
1016
for(char **e = g->environ; *e != NULL; e++){
810
1017
if(not add_environment(p, *e, false)){
811
perror("add_environment");
1018
error(0, errno, "add_environment");
812
1019
}
813
1020
}
814
1021
}
815
1022
}
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
818
process, too. */
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
819
1025
if(p->environ[0] != NULL){
820
1026
for(char **e = environ; *e != NULL; e++){
821
1027
if(not add_environment(p, *e, false)){
822
perror("add_environment");
1028
error(0, errno, "add_environment");
823
1029
}
824
1030
}
825
1031
}
826
1032
827
1033
int pipefd[2];
828
ret = pipe(pipefd);
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
829
1039
if(ret == -1){
830
perror("pipe");
831
exitstatus = EXIT_FAILURE;
832
goto fallback;
833
}
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
834
1055
/* Ask OS to automatic close the pipe on exec */
835
1056
ret = set_cloexec_flag(pipefd[0]);
836
1057
if(ret < 0){
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
839
1063
goto fallback;
840
1064
}
841
1065
ret = set_cloexec_flag(pipefd[1]);
842
1066
if(ret < 0){
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
845
1072
goto fallback;
846
1073
}
1074
#endif /* not O_CLOEXEC */
847
1075
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
849
1079
if(ret < 0){
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
852
1083
goto fallback;
853
1084
}
854
1085
/* Starting a new process to be watched */
855
pid_t pid = fork();
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
856
1090
if(pid == -1){
857
perror("fork");
858
exitstatus = EXIT_FAILURE;
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
859
1098
goto fallback;
860
1099
}
861
1100
if(pid == 0){
862
1101
/* this is the child process */
863
1102
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
1103
if(ret < 0){
865
perror("sigaction");
866
_exit(EXIT_FAILURE);
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
867
1106
}
868
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
1108
if(ret < 0){
870
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
872
1111
}
873
1112
874
1113
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
1114
if(ret == -1){
876
perror("dup2");
877
_exit(EXIT_FAILURE);
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
878
1117
}
879
1118
880
if(dirfd(dir) < 0){
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
above and must now close it manually here. */
883
closedir(dir);
884
}
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
887
perror("execv");
888
_exit(EXIT_FAILURE);
889
}
890
} else {
891
if(execve(filename, p->argv, p->environ) < 0){
892
perror("execve");
893
_exit(EXIT_FAILURE);
894
}
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
895
1125
}
896
1126
/* no return */
897
1127
}
898
1128
/* Parent process */
899
1129
close(pipefd[1]); /* Close unused write end of pipe */
900
free(filename);
901
plugin *new_plugin = getplugin(dirst->d_name);
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
902
1132
if(new_plugin == NULL){
903
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
905
1137
if(ret < 0){
906
perror("sigprocmask");
1138
error(0, errno, "sigprocmask");
907
1139
}
908
exitstatus = EXIT_FAILURE;
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
909
1142
goto fallback;
910
1143
}
1144
free(direntries[i]);
911
1145
912
1146
new_plugin->pid = pid;
913
1147
new_plugin->fd = pipefd[0];
914
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
915
1154
/* Unblock SIGCHLD so signal handler can be run if this process
916
1155
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
918
1159
if(ret < 0){
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
921
1162
goto fallback;
922
1163
}
923
1164
928
1169
}
929
1170
}
930
1171
931
closedir(dir);
932
dir = NULL;
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
933
1176
free_plugin(getplugin(NULL));
934
1177
935
1178
for(plugin *p = plugin_list; p != NULL; p = p->next){
947
1190
while(plugin_list){
948
1191
fd_set rfds = rfds_all;
949
1192
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
951
perror("select");
952
exitstatus = EXIT_FAILURE;
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
953
1196
goto fallback;
954
1197
}
955
1198
/* OK, now either a process completed, or something can be read
961
1204
if(not WIFEXITED(proc->status)
962
1205
or WEXITSTATUS(proc->status) != 0){
963
1206
/* Bad exit by plugin */
964
1207
965
1208
if(debug){
966
1209
if(WIFEXITED(proc->status)){
967
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1213
WEXITSTATUS(proc->status));
971
1214
} else if(WIFSIGNALED(proc->status)){
972
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1216
" signal %d: %s\n", proc->name,
974
1217
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
979
1220
}
980
1221
}
981
1222
982
1223
/* Remove the plugin */
983
1224
FD_CLR(proc->fd, &rfds_all);
984
1225
985
1226
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
987
1231
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
990
1234
goto fallback;
991
1235
}
992
1236
995
1239
proc = next_plugin;
996
1240
997
1241
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
1000
1245
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
1003
1248
goto fallback;
1004
1249
}
1005
1250
1015
1260
bool bret = print_out_password(proc->buffer,
1016
1261
proc->buffer_length);
1017
1262
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
1020
1265
}
1021
1266
goto fallback;
1022
1267
}
1029
1274
}
1030
1275
/* Before reading, make the process' data buffer large enough */
1031
1276
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1037
1282
goto fallback;
1038
1283
}
1284
proc->buffer = new_buffer;
1039
1285
proc->buffer_size += BUFFER_SIZE;
1040
1286
}
1041
1287
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1044
1292
if(sret < 0){
1045
1293
/* Read error from this process; ignore the error */
1046
1294
proc = proc->next;
1054
1302
}
1055
1303
}
1056
1304
}
1057
1058
1305
1306
1059
1307
fallback:
1060
1308
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1062
1311
/* Fallback if all plugins failed, none are found or an error
1063
1312
occured */
1064
1313
bool bret;
1072
1321
}
1073
1322
bret = print_out_password(passwordbuffer, len);
1074
1323
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1077
1326
}
1078
1327
}
1079
1328
1080
1329
/* Restore old signal handler */
1081
1330
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1331
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1085
1334
}
1086
1335
1087
1336
if(custom_argv != NULL){
1091
1340
free(custom_argv);
1092
1341
}
1093
1342
1094
if(dir != NULL){
1095
closedir(dir);
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1096
1347
}
1097
1348
1098
1349
/* Kill the processes */
1102
1353
ret = kill(p->pid, SIGTERM);
1103
1354
if(ret == -1 and errno != ESRCH){
1104
1355
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1356
error(0, errno, "kill");
1106
1357
}
1107
1358
}
1108
1359
}
1109
1360
1110
1361
/* Wait for any remaining child processes to terminate */
1111
do{
1362
do {
1112
1363
ret = wait(NULL);
1113
1364
} while(ret >= 0);
1114
1365
if(errno != ECHILD){
1115
perror("wait");
1366
error(0, errno, "wait");
1116
1367
}
1117
1368
1118
1369
free_plugin_list();
1119
1370
1120
1371
free(plugindir);
1372
free(pluginhelperdir);
1121
1373
free(argfile);
1122
1374
1123
1375
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0