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- Committer: Teddy Hogeborn
- Date: 2024-09-08 00:08:15 UTC
- mto: This revision was merged to the branch mainline in revision 410.
- Revision ID: teddy@recompile.se-20240908000815-x3gr5xion3kyyoio
Improve documentation
* mandos.conf.xml (DESCRIPTION): Remove the unnecessary word "simple".
* plugin-runner.xml (PLUGINS): Remove the unnecessary word "simply",
and add the "executable" qualifier to the description of plugins.
* mandos-client.xml (DESCRIPTION, OPTIONS): Do not refer to
"plugin-runner"; instead refer to the section "OVERVIEW".
(OVERVIEW): Don't only describe plugin-runner; also describe
how password-agent can start mandos-client.
(EXAMPLE): Do not refer to "plugin-runner"; instead refer to the
section "OVERVIEW".
(SEE ALSO): Replace reference to "password-prompt" with
"password-agent".
* mandos.conf.xml (DESCRIPTION): Remove the unnecessary word "simple".
* plugin-runner.xml (PLUGINS): Remove the unnecessary word "simply",
and add the "executable" qualifier to the description of plugins.
* mandos-client.xml (DESCRIPTION, OPTIONS): Do not refer to
"plugin-runner"; instead refer to the section "OVERVIEW".
(OVERVIEW): Don't only describe plugin-runner; also describe
how password-agent can start mandos-client.
(EXAMPLE): Do not refer to "plugin-runner"; instead refer to the
section "OVERVIEW".
(SEE ALSO): Replace reference to "password-prompt" with
"password-agent".
- 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 © 2008-2022 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
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() */
66
#include <errno.h> /* errno, EBADF */
67
#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 */
68
89
69
90
#define BUFFER_SIZE 256
70
91
71
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
72
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
95
74
96
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
98
77
99
typedef struct plugin{
78
100
char *name; /* can be NULL or any plugin name */
81
103
char **environ;
82
104
int envc;
83
105
bool disabled;
84
106
85
107
/* Variables used for running processes*/
86
108
pid_t pid;
87
109
int fd;
89
111
size_t buffer_size;
90
112
size_t buffer_length;
91
113
bool eof;
92
volatile bool completed;
93
volatile int status;
114
volatile sig_atomic_t completed;
115
int status;
94
116
struct plugin *next;
95
117
} plugin;
96
118
98
120
99
121
/* Gets an existing plugin based on name,
100
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
101
124
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
125
/* Check for existing plugin with that name */
103
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
127
if((p->name == name)
105
128
or (p->name and name and (strcmp(p->name, name) == 0))){
107
130
}
108
131
}
109
132
/* Create a new plugin */
110
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);
111
137
if(new_plugin == NULL){
112
138
return NULL;
113
139
}
114
140
char *copy_name = NULL;
115
141
if(name != NULL){
116
copy_name = strdup(name);
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
117
145
if(copy_name == NULL){
146
int e = errno;
118
147
free(new_plugin);
148
errno = e;
119
149
return NULL;
120
150
}
121
151
}
122
152
123
*new_plugin = (plugin) { .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
127
157
128
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);
129
161
if(new_plugin->argv == NULL){
162
int e = errno;
130
163
free(copy_name);
131
164
free(new_plugin);
165
errno = e;
132
166
return NULL;
133
167
}
134
168
new_plugin->argv[0] = copy_name;
135
169
new_plugin->argv[1] = NULL;
136
170
137
new_plugin->environ = malloc(sizeof(char *));
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
138
174
if(new_plugin->environ == NULL){
175
int e = errno;
139
176
free(copy_name);
140
177
free(new_plugin->argv);
141
178
free(new_plugin);
179
errno = e;
142
180
return NULL;
143
181
}
144
182
new_plugin->environ[0] = NULL;
149
187
}
150
188
151
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
152
191
static bool add_to_char_array(const char *new, char ***array,
153
192
int *len){
154
193
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (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);
157
210
/* Malloc check */
158
if(*array == NULL){
211
if(new_array == NULL){
159
212
return false;
160
213
}
214
*array = new_array;
161
215
/* Make a copy of the new string */
162
char *copy = strdup(new);
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
163
220
if(copy == NULL){
164
221
return false;
165
222
}
172
229
}
173
230
174
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
175
233
static bool add_argument(plugin *p, const char *arg){
176
234
if(p == NULL){
177
235
return false;
180
238
}
181
239
182
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
183
242
static bool add_environment(plugin *p, const char *def, bool replace){
184
243
if(p == NULL){
185
244
return false;
187
246
/* namelen = length of name of environment variable */
188
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
248
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
192
251
/* It already exists */
193
252
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
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){
196
258
return false;
197
259
}
198
*e = new;
199
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
200
262
}
201
263
return true;
202
264
}
204
266
return add_to_char_array(def, &(p->environ), &(p->envc));
205
267
}
206
268
269
#ifndef O_CLOEXEC
207
270
/*
208
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
272
* Descriptor Flags".
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
274
*/
275
__attribute__((warn_unused_result))
212
276
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
278
/* If reading the flags failed, return error indication now. */
215
279
if(ret < 0){
216
280
return ret;
217
281
}
218
282
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
220
285
}
286
#endif /* not O_CLOEXEC */
221
287
222
288
223
289
/* Mark processes as completed when they exit, and save their exit
224
290
status. */
225
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
226
293
while(true){
227
294
plugin *proc = plugin_list;
228
295
int status;
232
299
break;
233
300
}
234
301
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
237
305
}
238
/* No child processes */
239
break;
306
error(0, errno, "waitpid");
240
307
}
241
308
242
309
/* A child exited, find it in process_list */
248
315
continue;
249
316
}
250
317
proc->status = status;
251
proc->completed = true;
318
proc->completed = 1;
252
319
}
320
errno = old_errno;
253
321
}
254
322
255
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
256
325
static bool print_out_password(const char *buffer, size_t length){
257
326
ssize_t ret;
258
327
for(size_t written = 0; written < length; written += (size_t)ret){
266
335
}
267
336
268
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
269
339
static void free_plugin(plugin *plugin_node){
270
340
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
272
342
free(*arg);
273
343
}
344
free(plugin_node->name);
274
345
free(plugin_node->argv);
275
346
for(char **env = plugin_node->environ; *env != NULL; env++){
276
347
free(*env);
277
348
}
278
349
free(plugin_node->environ);
279
350
free(plugin_node->buffer);
280
351
281
352
/* Removes the plugin from the singly-linked list */
282
353
if(plugin_node == plugin_list){
283
354
/* First one - simple */
303
374
304
375
int main(int argc, char *argv[]){
305
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
306
378
char *argfile = NULL;
307
379
FILE *conffp;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
380
struct dirent **direntries = NULL;
311
381
struct stat st;
312
382
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
383
int ret, maxfd = 0;
314
384
ssize_t sret;
315
intmax_t tmpmax;
316
385
uid_t uid = 65534;
317
386
gid_t gid = 65534;
318
387
bool debug = false;
322
391
.sa_flags = SA_NOCLDSTOP };
323
392
char **custom_argv = NULL;
324
393
int custom_argc = 0;
394
int dir_fd = -1;
325
395
326
396
/* Establish a signal handler */
327
397
sigemptyset(&sigchld_action.sa_mask);
328
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
399
if(ret == -1){
330
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
332
402
goto fallback;
333
403
}
334
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
405
if(ret == -1){
336
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
338
408
goto fallback;
339
409
}
340
410
372
442
.doc = "Group ID the plugins will run as", .group = 3 },
373
443
{ .name = "debug", .key = 132,
374
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 },
375
458
{ .name = NULL }
376
459
};
377
460
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
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;
381
467
case 'g': /* --global-options */
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;
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
391
473
}
392
474
}
475
errno = 0;
393
476
}
394
477
break;
395
478
case 'G': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
401
481
}
402
482
break;
403
483
case 'o': /* --options-for */
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
}
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;
423
505
}
424
506
break;
425
507
case 'E': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
508
{
430
509
char *envdef = strchr(arg, ':');
431
510
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
432
513
break;
433
514
}
434
515
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
436
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;
437
524
}
438
525
}
439
526
break;
440
527
case 'd': /* --disable */
441
if(arg != NULL){
528
{
442
529
plugin *p = getplugin(arg);
443
if(p == NULL){
444
return ARGP_ERR_UNKNOWN;
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
445
533
}
446
p->disabled = true;
447
534
}
448
535
break;
449
536
case 'e': /* --enable */
450
if(arg != NULL){
537
{
451
538
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
454
542
}
455
p->disabled = false;
456
543
}
457
544
break;
458
545
case 128: /* --plugin-dir */
459
546
free(plugindir);
460
547
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
548
if(plugindir != NULL){
549
errno = 0;
550
}
464
551
break;
465
552
case 129: /* --config-file */
466
553
/* This is already done by parse_opt_config_file() */
467
554
break;
468
555
case 130: /* --userid */
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;
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;
476
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
477
565
break;
478
566
case 131: /* --groupid */
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;
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;
486
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
487
576
break;
488
577
case 132: /* --debug */
489
578
debug = true;
490
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;
491
603
/*
492
604
* When adding more options before this line, remember to also add a
493
605
* "case" to the "parse_opt_config_file" function below.
496
608
/* Cryptsetup always passes an argument, which is an empty
497
609
string if "none" was specified in /etc/crypttab. So if
498
610
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
611
if(arg[0] == '\0'){
612
break;
501
613
}
502
break;
503
case ARGP_KEY_END:
504
break;
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
505
619
default:
506
620
return ARGP_ERR_UNKNOWN;
507
621
}
508
return 0;
622
return errno; /* Set to 0 at start */
509
623
}
510
624
511
625
/* This option parser is the same as parse_opt() above, except it
512
626
ignores everything but the --config-file option. */
513
627
error_t parse_opt_config_file(int key, char *arg,
514
628
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
517
632
case 'g': /* --global-options */
518
633
case 'G': /* --global-env */
519
634
case 'o': /* --options-for */
525
640
case 129: /* --config-file */
526
641
free(argfile);
527
642
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
643
if(argfile != NULL){
644
errno = 0;
530
645
}
531
break;
646
break;
532
647
case 130: /* --userid */
533
648
case 131: /* --groupid */
534
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
535
654
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
655
break;
538
656
default:
539
657
return ARGP_ERR_UNKNOWN;
540
658
}
541
return 0;
659
return errno;
542
660
}
543
661
544
662
struct argp argp = { .options = options,
548
666
549
667
/* Parse using parse_opt_config_file() in order to get the custom
550
668
config file location, if any. */
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;
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;
555
683
goto fallback;
556
684
}
557
685
563
691
conffp = fopen(AFILE, "r");
564
692
} else {
565
693
conffp = fopen(argfile, "r");
566
}
694
}
567
695
if(conffp != NULL){
568
696
char *org_line = NULL;
569
697
char *p, *arg, *new_arg, *line;
570
698
size_t size = 0;
571
699
const char whitespace_delims[] = " \r\t\f\v\n";
572
700
const char comment_delim[] = "#";
573
701
574
702
custom_argc = 1;
575
703
custom_argv = malloc(sizeof(char*) * 2);
576
704
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
579
707
goto fallback;
580
708
}
581
709
custom_argv[0] = argv[0];
582
710
custom_argv[1] = NULL;
583
711
584
712
/* for each line in the config file, strip whitespace and ignore
585
713
commented text */
586
714
while(true){
588
716
if(sret == -1){
589
717
break;
590
718
}
591
719
592
720
line = org_line;
593
721
arg = strsep(&line, comment_delim);
594
722
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
725
}
598
726
new_arg = strdup(p);
599
727
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
602
730
free(org_line);
603
731
goto fallback;
604
732
}
605
733
606
734
custom_argc += 1;
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;
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
}
614
759
}
615
760
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
761
custom_argv[custom_argc] = NULL;
617
762
}
618
763
}
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
}
619
772
free(org_line);
620
773
} else {
621
774
/* Check for harmful errors and go to fallback. Other errors might
622
775
not affect opening plugins */
623
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
perror("fopen");
625
exitstatus = EXIT_FAILURE;
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
626
779
goto fallback;
627
780
}
628
781
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
631
784
if(custom_argv != NULL){
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;
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;
637
799
goto fallback;
638
800
}
639
801
}
640
802
641
803
/* Parse actual command line arguments, to let them override the
642
804
config file */
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;
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
}
648
838
}
649
839
650
840
if(debug){
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
652
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
843
p->name ? p->name : "Global", p->argc - 1);
654
844
for(char **a = p->argv; *a != NULL; a++){
661
851
}
662
852
}
663
853
664
/* Strip permissions down to nobody */
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
}
665
892
ret = setuid(uid);
666
893
if(ret == -1){
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 */
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
687
898
{
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;
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;
695
943
}
696
944
}
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;
697
955
}
698
956
699
957
FD_ZERO(&rfds_all);
700
958
701
959
/* Read and execute any executable in the plugin directory*/
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");
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]);
769
966
continue;
770
967
}
771
772
ret = stat(filename, &st);
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
773
969
if(ret == -1){
774
perror("stat");
775
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
776
973
continue;
777
974
}
778
975
779
976
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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)){
781
980
if(debug){
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
" with bad type or mode\n", filename);
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);
784
985
}
785
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
786
988
continue;
787
989
}
788
990
789
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
790
992
if(p == NULL){
791
perror("getplugin");
792
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
793
996
continue;
794
997
}
795
998
if(p->disabled){
796
999
if(debug){
797
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
798
dirst->d_name);
1001
direntries[i]->d_name);
799
1002
}
800
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
801
1005
continue;
802
1006
}
803
1007
{
806
1010
if(g != NULL){
807
1011
for(char **a = g->argv + 1; *a != NULL; a++){
808
1012
if(not add_argument(p, *a)){
809
perror("add_argument");
1013
error(0, errno, "add_argument");
810
1014
}
811
1015
}
812
1016
/* Add global environment variables */
813
1017
for(char **e = g->environ; *e != NULL; e++){
814
1018
if(not add_environment(p, *e, false)){
815
perror("add_environment");
1019
error(0, errno, "add_environment");
816
1020
}
817
1021
}
818
1022
}
819
1023
}
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. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
823
1026
if(p->environ[0] != NULL){
824
1027
for(char **e = environ; *e != NULL; e++){
825
1028
if(not add_environment(p, *e, false)){
826
perror("add_environment");
1029
error(0, errno, "add_environment");
827
1030
}
828
1031
}
829
1032
}
830
1033
831
1034
int pipefd[2];
832
ret = pipe(pipefd);
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 */
833
1040
if(ret == -1){
834
perror("pipe");
835
exitstatus = EXIT_FAILURE;
836
goto fallback;
837
}
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
838
1056
/* Ask OS to automatic close the pipe on exec */
839
1057
ret = set_cloexec_flag(pipefd[0]);
840
1058
if(ret < 0){
841
perror("set_cloexec_flag");
842
exitstatus = EXIT_FAILURE;
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
843
1064
goto fallback;
844
1065
}
845
1066
ret = set_cloexec_flag(pipefd[1]);
846
1067
if(ret < 0){
847
perror("set_cloexec_flag");
848
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
849
1073
goto fallback;
850
1074
}
1075
#endif /* not O_CLOEXEC */
851
1076
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
853
1080
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
856
1084
goto fallback;
857
1085
}
858
1086
/* Starting a new process to be watched */
859
pid_t pid = fork();
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
860
1091
if(pid == -1){
861
perror("fork");
862
exitstatus = EXIT_FAILURE;
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]);
863
1099
goto fallback;
864
1100
}
865
1101
if(pid == 0){
866
1102
/* this is the child process */
867
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
868
1104
if(ret < 0){
869
perror("sigaction");
870
_exit(EXIT_FAILURE);
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
871
1107
}
872
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
1109
if(ret < 0){
874
perror("sigprocmask");
875
_exit(EXIT_FAILURE);
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
876
1112
}
877
1113
878
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
1115
if(ret == -1){
880
perror("dup2");
881
_exit(EXIT_FAILURE);
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
882
1118
}
883
1119
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
}
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);
899
1126
}
900
1127
/* no return */
901
1128
}
902
1129
/* Parent process */
903
1130
close(pipefd[1]); /* Close unused write end of pipe */
904
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
906
1133
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
909
1138
if(ret < 0){
910
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
911
1140
}
912
exitstatus = EXIT_FAILURE;
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
913
1143
goto fallback;
914
1144
}
1145
free(direntries[i]);
915
1146
916
1147
new_plugin->pid = pid;
917
1148
new_plugin->fd = pipefd[0];
918
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
919
1155
/* Unblock SIGCHLD so signal handler can be run if this process
920
1156
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
922
1160
if(ret < 0){
923
perror("sigprocmask");
924
exitstatus = EXIT_FAILURE;
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
925
1163
goto fallback;
926
1164
}
927
1165
932
1170
}
933
1171
}
934
1172
935
closedir(dir);
936
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
937
1178
938
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
1180
if(p->pid != 0){
950
1191
while(plugin_list){
951
1192
fd_set rfds = rfds_all;
952
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
956
1197
goto fallback;
957
1198
}
958
1199
/* OK, now either a process completed, or something can be read
959
1200
from one of them */
960
1201
for(plugin *proc = plugin_list; proc != NULL;){
961
1202
/* Is this process completely done? */
962
if(proc->eof and proc->completed){
1203
if(proc->completed and proc->eof){
963
1204
/* Only accept the plugin output if it exited cleanly */
964
1205
if(not WIFEXITED(proc->status)
965
1206
or WEXITSTATUS(proc->status) != 0){
966
1207
/* Bad exit by plugin */
967
1208
968
1209
if(debug){
969
1210
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
972
1214
WEXITSTATUS(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));
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)));
980
1221
}
981
1222
}
982
1223
983
1224
/* Remove the plugin */
984
1225
FD_CLR(proc->fd, &rfds_all);
985
1226
986
1227
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
988
1232
if(ret < 0){
989
perror("sigprocmask");
990
exitstatus = EXIT_FAILURE;
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
991
1235
goto fallback;
992
1236
}
993
1237
996
1240
proc = next_plugin;
997
1241
998
1242
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
1001
1246
if(ret < 0){
1002
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
1004
1249
goto fallback;
1005
1250
}
1006
1251
1016
1261
bool bret = print_out_password(proc->buffer,
1017
1262
proc->buffer_length);
1018
1263
if(not bret){
1019
perror("print_out_password");
1020
exitstatus = EXIT_FAILURE;
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
1021
1266
}
1022
1267
goto fallback;
1023
1268
}
1030
1275
}
1031
1276
/* Before reading, make the process' data buffer large enough */
1032
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
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;
1038
1283
goto fallback;
1039
1284
}
1285
proc->buffer = new_buffer;
1040
1286
proc->buffer_size += BUFFER_SIZE;
1041
1287
}
1042
1288
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1045
1293
if(sret < 0){
1046
1294
/* Read error from this process; ignore the error */
1047
1295
proc = proc->next;
1055
1303
}
1056
1304
}
1057
1305
}
1058
1059
1306
1307
1060
1308
fallback:
1061
1309
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1063
1312
/* Fallback if all plugins failed, none are found or an error
1064
1313
occured */
1065
1314
bool bret;
1073
1322
}
1074
1323
bret = print_out_password(passwordbuffer, len);
1075
1324
if(not bret){
1076
perror("print_out_password");
1077
exitstatus = EXIT_FAILURE;
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1078
1327
}
1079
1328
}
1080
1329
1081
1330
/* Restore old signal handler */
1082
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
1332
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1086
1335
}
1087
1336
1088
1337
if(custom_argv != NULL){
1092
1341
free(custom_argv);
1093
1342
}
1094
1343
1095
if(dir != NULL){
1096
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1097
1348
}
1098
1349
1099
1350
/* Kill the processes */
1103
1354
ret = kill(p->pid, SIGTERM);
1104
1355
if(ret == -1 and errno != ESRCH){
1105
1356
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1357
error(0, errno, "kill");
1107
1358
}
1108
1359
}
1109
1360
}
1110
1361
1111
1362
/* Wait for any remaining child processes to terminate */
1112
do{
1363
do {
1113
1364
ret = wait(NULL);
1114
1365
} while(ret >= 0);
1115
1366
if(errno != ECHILD){
1116
perror("wait");
1367
error(0, errno, "wait");
1117
1368
}
1118
1369
1119
1370
free_plugin_list();
1120
1371
1121
1372
free(plugindir);
1373
free(pluginhelperdir);
1122
1374
free(argfile);
1123
1375
1124
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0