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- Committer: Teddy Hogeborn
- Date: 2008-09-05 23:39:07 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905233907-3rz7kuwyjwma0pjx
* Makefile (confdir/clients.conf): Tighten permissions to "u=rw".
(install-server): Set mode of "/etc/mandos/clients.conf" to
"u=rw".
(install-client): Set mode of "/etc/mandos/plugins.d" to "u=rwx".
(uninstall-client): Also remove "/usr/lib/mandos/plugins.d/usplash",
"/usr/share/initramfs-tools/scripts/local-top/mandos",
and "/etc/keys/mandos".
(purge-server): Also remove "/var/run/mandos.pid".
* initramfs-tools-hook: Use "install" instead of "mkdir". Change
owner of "/lib/mandos/plugins.d" and key
files. Bug fix: do not repair permissions of
"/lib/mandos/plugins.d". Bug fix: Really
avoid deliberately unreadable files and/or
directories.
* mandos-keygen (umask): Changed to "077".
(install-server): Set mode of "/etc/mandos/clients.conf" to
"u=rw".
(install-client): Set mode of "/etc/mandos/plugins.d" to "u=rwx".
(uninstall-client): Also remove "/usr/lib/mandos/plugins.d/usplash",
"/usr/share/initramfs-tools/scripts/local-top/mandos",
and "/etc/keys/mandos".
(purge-server): Also remove "/var/run/mandos.pid".
* initramfs-tools-hook: Use "install" instead of "mkdir". Change
owner of "/lib/mandos/plugins.d" and key
files. Bug fix: do not repair permissions of
"/lib/mandos/plugins.d". Bug fix: Really
avoid deliberately unreadable files and/or
directories.
* mandos-keygen (umask): Changed to "077".
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read(),
51
lstat(), symlink() */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
97
89
size_t buffer_size;
98
90
size_t buffer_length;
99
91
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
92
volatile bool completed;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
106
98
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
115
106
return p;
116
107
}
117
108
}
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
118
return NULL;
136
119
}
137
120
}
138
121
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
143
126
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
149
129
free(copy_name);
150
130
free(new_plugin);
151
errno = e;
152
131
return NULL;
153
132
}
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
156
135
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
161
int e = errno;
162
138
free(copy_name);
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
165
errno = e;
166
141
return NULL;
167
142
}
168
143
new_plugin->environ[0] = NULL;
173
148
}
174
149
175
150
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
151
static bool add_to_char_array(const char *new, char ***array,
178
152
int *len){
179
153
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
196
156
/* Malloc check */
197
if(new_array == NULL){
157
if(*array == NULL){
198
158
return false;
199
159
}
200
*array = new_array;
201
160
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
206
162
if(copy == NULL){
207
163
return false;
208
164
}
215
171
}
216
172
217
173
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
174
static bool add_argument(plugin *p, const char *arg){
220
175
if(p == NULL){
221
176
return false;
224
179
}
225
180
226
181
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
182
static bool add_environment(plugin *p, const char *def, bool replace){
229
183
if(p == NULL){
230
184
return false;
232
186
/* namelen = length of name of environment variable */
233
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
188
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
237
191
/* It already exists */
238
192
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
244
195
return false;
245
196
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
248
199
}
249
200
return true;
250
201
}
252
203
return add_to_char_array(def, &(p->environ), &(p->envc));
253
204
}
254
205
255
#ifndef O_CLOEXEC
256
206
/*
257
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
208
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
210
*/
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
264
214
/* If reading the flags failed, return error indication now. */
265
215
if(ret < 0){
266
216
return ret;
267
217
}
268
218
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
220
}
272
#endif /* not O_CLOEXEC */
273
221
274
222
275
223
/* Mark processes as completed when they exit, and save their exit
276
224
status. */
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
279
226
while(true){
280
227
plugin *proc = plugin_list;
281
228
int status;
285
232
break;
286
233
}
287
234
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
235
if (errno != ECHILD){
236
perror("waitpid");
291
237
}
292
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
293
240
}
294
241
295
242
/* A child exited, find it in process_list */
301
248
continue;
302
249
}
303
250
proc->status = status;
304
proc->completed = 1;
251
proc->completed = true;
305
252
}
306
errno = old_errno;
307
253
}
308
254
309
255
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
312
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
313
261
for(size_t written = 0; written < length; written += (size_t)ret){
314
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
315
263
length - written));
321
269
}
322
270
323
271
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
272
static void free_plugin(plugin *plugin_node){
326
273
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
275
free(*arg);
329
276
}
330
free(plugin_node->name);
331
277
free(plugin_node->argv);
332
278
for(char **env = plugin_node->environ; *env != NULL; env++){
333
279
free(*env);
334
280
}
335
281
free(plugin_node->environ);
336
282
free(plugin_node->buffer);
337
283
338
284
/* Removes the plugin from the singly-linked list */
339
285
if(plugin_node == plugin_list){
340
286
/* First one - simple */
360
306
361
307
int main(int argc, char *argv[]){
362
308
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
309
char *argfile = NULL;
365
310
FILE *conffp;
366
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
367
314
struct stat st;
368
315
fd_set rfds_all;
369
316
int ret, maxfd = 0;
370
ssize_t sret;
371
317
uid_t uid = 65534;
372
318
gid_t gid = 65534;
373
319
bool debug = false;
377
323
.sa_flags = SA_NOCLDSTOP };
378
324
char **custom_argv = NULL;
379
325
int custom_argc = 0;
380
int dir_fd = -1;
381
326
382
327
/* Establish a signal handler */
383
328
sigemptyset(&sigchld_action.sa_mask);
384
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
330
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
388
333
goto fallback;
389
334
}
390
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
336
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
394
339
goto fallback;
395
340
}
396
341
428
373
.doc = "Group ID the plugins will run as", .group = 3 },
429
374
{ .name = "debug", .key = 132,
430
375
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
444
376
{ .name = NULL }
445
377
};
446
378
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
453
382
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
459
392
}
460
393
}
461
errno = 0;
462
394
}
463
395
break;
464
396
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
467
408
}
468
409
break;
469
410
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
491
430
}
492
431
break;
493
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
494
436
{
495
437
char *envdef = strchr(arg, ':');
496
438
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
502
445
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
510
448
}
511
449
}
512
450
break;
513
451
case 'd': /* --disable */
514
{
452
if (arg != NULL){
515
453
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
519
456
}
457
p->disabled = true;
520
458
}
521
459
break;
522
460
case 'e': /* --enable */
523
{
461
if (arg != NULL){
524
462
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
528
465
}
466
p->disabled = false;
529
467
}
530
468
break;
531
469
case 128: /* --plugin-dir */
532
free(plugindir);
533
470
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
471
if(plugindir == NULL){
472
perror("strdup");
473
}
537
474
break;
538
475
case 129: /* --config-file */
539
476
/* This is already done by parse_opt_config_file() */
540
477
break;
541
478
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
479
uid = (uid_t)strtol(arg, NULL, 10);
551
480
break;
552
481
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
482
gid = (gid_t)strtol(arg, NULL, 10);
562
483
break;
563
484
case 132: /* --debug */
564
485
debug = true;
565
486
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
487
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
605
492
default:
606
493
return ARGP_ERR_UNKNOWN;
607
494
}
608
return errno; /* Set to 0 at start */
495
return 0;
609
496
}
610
497
611
498
/* This option parser is the same as parse_opt() above, except it
612
499
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
618
504
case 'g': /* --global-options */
619
505
case 'G': /* --global-env */
620
506
case 'o': /* --options-for */
624
510
case 128: /* --plugin-dir */
625
511
break;
626
512
case 129: /* --config-file */
627
free(argfile);
628
513
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
514
if(argfile == NULL){
515
perror("strdup");
631
516
}
632
break;
517
break;
633
518
case 130: /* --userid */
634
519
case 131: /* --groupid */
635
520
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
521
case ARGP_KEY_ARG:
522
case ARGP_KEY_END:
641
523
break;
642
524
default:
643
525
return ARGP_ERR_UNKNOWN;
644
526
}
645
return errno;
527
return 0;
646
528
}
647
529
648
530
struct argp argp = { .options = options,
650
532
.args_doc = "",
651
533
.doc = "Mandos plugin runner -- Run plugins" };
652
534
653
/* Parse using parse_opt_config_file() in order to get the custom
535
/* Parse using the parse_opt_config_file in order to get the custom
654
536
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
669
541
goto fallback;
670
542
}
671
543
673
545
argp.parser = parse_opt;
674
546
675
547
/* Open the configfile if available */
676
if(argfile == NULL){
548
if (argfile == NULL){
677
549
conffp = fopen(AFILE, "r");
678
550
} else {
679
551
conffp = fopen(argfile, "r");
680
}
552
}
681
553
if(conffp != NULL){
682
554
char *org_line = NULL;
683
555
char *p, *arg, *new_arg, *line;
684
556
size_t size = 0;
557
ssize_t sret;
685
558
const char whitespace_delims[] = " \r\t\f\v\n";
686
559
const char comment_delim[] = "#";
687
560
688
561
custom_argc = 1;
689
562
custom_argv = malloc(sizeof(char*) * 2);
690
563
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
564
perror("malloc");
565
exitstatus = EXIT_FAILURE;
693
566
goto fallback;
694
567
}
695
568
custom_argv[0] = argv[0];
696
569
custom_argv[1] = NULL;
697
570
698
571
/* for each line in the config file, strip whitespace and ignore
699
572
commented text */
700
573
while(true){
702
575
if(sret == -1){
703
576
break;
704
577
}
705
578
706
579
line = org_line;
707
580
arg = strsep(&line, comment_delim);
708
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
584
}
712
585
new_arg = strdup(p);
713
586
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
716
589
free(org_line);
717
590
goto fallback;
718
591
}
719
592
720
593
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
744
601
}
745
602
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
603
custom_argv[custom_argc] = NULL;
747
604
}
748
605
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
606
free(org_line);
758
607
} else {
759
608
/* Check for harmful errors and go to fallback. Other errors might
760
609
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
764
613
goto fallback;
765
614
}
766
615
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
769
618
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
784
624
goto fallback;
785
625
}
786
626
}
787
627
788
628
/* Parse actual command line arguments, to let them override the
789
629
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
823
635
}
824
636
825
637
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
638
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
639
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
640
p->name ? p->name : "Global", p->argc - 1);
829
641
for(char **a = p->argv; *a != NULL; a++){
830
642
fprintf(stderr, "\tArg: %s\n", *a);
831
643
}
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
645
for(char **a = p->environ; *a != NULL; a++){
834
646
fprintf(stderr, "\t%s\n", *a);
835
647
}
836
648
}
837
649
}
838
650
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
862
/* Work around Debian bug #981302
863
<https://bugs.debian.org/981302> */
864
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
865
ret = symlink("/proc/self/fd", "/dev/fd");
866
if(ret == -1){
867
error(0, errno, "Failed to create /dev/fd symlink");
868
}
869
}
870
}
871
872
/* Lower permissions */
873
ret = setgid(gid);
874
if(ret == -1){
875
error(0, errno, "setgid");
876
}
651
/* Strip permissions down to nobody */
877
652
ret = setuid(uid);
878
if(ret == -1){
879
error(0, errno, "setuid");
880
}
881
882
/* Open plugin directory with close_on_exec flag */
653
if (ret == -1){
654
perror("setuid");
655
}
656
setgid(gid);
657
if (ret == -1){
658
perror("setgid");
659
}
660
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
667
if(dir == NULL){
668
perror("Could not open plugin dir");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
672
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
883
674
{
884
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
885
#ifdef O_CLOEXEC
886
O_CLOEXEC
887
#else /* not O_CLOEXEC */
888
0
889
#endif /* not O_CLOEXEC */
890
);
891
if(dir_fd == -1){
892
error(0, errno, "Could not open plugin dir");
893
exitstatus = EX_UNAVAILABLE;
894
goto fallback;
895
}
896
897
#ifndef O_CLOEXEC
898
/* Set the FD_CLOEXEC flag on the directory */
899
ret = set_cloexec_flag(dir_fd);
900
if(ret < 0){
901
error(0, errno, "set_cloexec_flag");
902
exitstatus = EX_OSERR;
903
goto fallback;
904
}
905
#endif /* O_CLOEXEC */
906
}
907
908
int good_name(const struct dirent * const dirent){
909
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
910
"*.dpkg-old", "*.dpkg-bak",
911
"*.dpkg-divert", NULL };
912
#ifdef __GNUC__
913
#pragma GCC diagnostic push
914
#pragma GCC diagnostic ignored "-Wcast-qual"
915
#endif
916
for(const char **pat = (const char **)patterns;
917
*pat != NULL; pat++){
918
#ifdef __GNUC__
919
#pragma GCC diagnostic pop
920
#endif
921
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
922
!= FNM_NOMATCH){
923
if(debug){
924
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
925
" matching pattern %s\n", dirent->d_name, *pat);
926
}
927
return 0;
675
int dir_fd = dirfd(dir);
676
if(dir_fd >= 0){
677
ret = set_cloexec_flag(dir_fd);
678
if(ret < 0){
679
perror("set_cloexec_flag");
680
exitstatus = EXIT_FAILURE;
681
goto fallback;
928
682
}
929
683
}
930
return 1;
931
}
932
933
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
934
alphasort);
935
if(numplugins == -1){
936
error(0, errno, "Could not scan plugin dir");
937
direntries = NULL;
938
exitstatus = EX_OSERR;
939
goto fallback;
940
684
}
941
685
942
686
FD_ZERO(&rfds_all);
943
687
944
688
/* Read and execute any executable in the plugin directory*/
945
for(int i = 0; i < numplugins; i++){
946
947
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
948
if(plugin_fd == -1){
949
error(0, errno, "Could not open plugin");
950
free(direntries[i]);
951
continue;
952
}
953
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
954
if(ret == -1){
955
error(0, errno, "stat");
956
close(plugin_fd);
957
free(direntries[i]);
958
continue;
959
}
960
689
while(true){
690
dirst = readdir(dir);
691
692
/* All directory entries have been processed */
693
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
697
goto fallback;
698
}
699
break;
700
}
701
702
d_name_len = strlen(dirst->d_name);
703
704
/* Ignore dotfiles, backup files and other junk */
705
{
706
bool bad_name = false;
707
708
const char const *bad_prefixes[] = { ".", "#", NULL };
709
710
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
711
".dpkg-old",
712
".dpkg-divert", NULL };
713
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
714
size_t pre_len = strlen(*pre);
715
if((d_name_len >= pre_len)
716
and strncmp((dirst->d_name), *pre, pre_len) == 0){
717
if(debug){
718
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
719
" with bad prefix %s\n", dirst->d_name, *pre);
720
}
721
bad_name = true;
722
break;
723
}
724
}
725
if(bad_name){
726
continue;
727
}
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
729
size_t suf_len = strlen(*suf);
730
if((d_name_len >= suf_len)
731
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
732
== 0)){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad suffix %s\n", dirst->d_name, *suf);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
742
if(bad_name){
743
continue;
744
}
745
}
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
751
continue;
752
}
753
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
757
free(filename);
758
continue;
759
}
760
961
761
/* Ignore non-executable files */
962
if(not S_ISREG(st.st_mode)
963
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
964
X_OK, 0)) != 0)){
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
965
763
if(debug){
966
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
967
" with bad type or mode\n",
968
plugindir != NULL ? plugindir : PDIR,
969
direntries[i]->d_name);
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
" with bad type or mode\n", filename);
970
766
}
971
close(plugin_fd);
972
free(direntries[i]);
767
free(filename);
973
768
continue;
974
769
}
975
770
976
plugin *p = getplugin(direntries[i]->d_name);
771
plugin *p = getplugin(dirst->d_name);
977
772
if(p == NULL){
978
error(0, errno, "getplugin");
979
close(plugin_fd);
980
free(direntries[i]);
773
perror("getplugin");
774
free(filename);
981
775
continue;
982
776
}
983
777
if(p->disabled){
984
778
if(debug){
985
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
986
direntries[i]->d_name);
780
dirst->d_name);
987
781
}
988
close(plugin_fd);
989
free(direntries[i]);
782
free(filename);
990
783
continue;
991
784
}
992
785
{
995
788
if(g != NULL){
996
789
for(char **a = g->argv + 1; *a != NULL; a++){
997
790
if(not add_argument(p, *a)){
998
error(0, errno, "add_argument");
791
perror("add_argument");
999
792
}
1000
793
}
1001
794
/* Add global environment variables */
1002
795
for(char **e = g->environ; *e != NULL; e++){
1003
796
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
797
perror("add_environment");
1005
798
}
1006
799
}
1007
800
}
1008
801
}
1009
/* If this plugin has any environment variables, we need to
1010
duplicate the environment from this process, too. */
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
1011
805
if(p->environ[0] != NULL){
1012
806
for(char **e = environ; *e != NULL; e++){
1013
807
if(not add_environment(p, *e, false)){
1014
error(0, errno, "add_environment");
808
perror("add_environment");
1015
809
}
1016
810
}
1017
811
}
1018
812
1019
813
int pipefd[2];
1020
#ifndef O_CLOEXEC
1021
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1022
#else /* O_CLOEXEC */
1023
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1024
#endif /* O_CLOEXEC */
1025
if(ret == -1){
1026
error(0, errno, "pipe");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
if(pipefd[0] >= FD_SETSIZE){
1032
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1033
FD_SETSIZE);
1034
close(pipefd[0]);
1035
close(pipefd[1]);
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
goto fallback;
1039
}
1040
#ifndef O_CLOEXEC
814
ret = pipe(pipefd);
815
if (ret == -1){
816
perror("pipe");
817
exitstatus = EXIT_FAILURE;
818
goto fallback;
819
}
1041
820
/* Ask OS to automatic close the pipe on exec */
1042
821
ret = set_cloexec_flag(pipefd[0]);
1043
822
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
823
perror("set_cloexec_flag");
824
exitstatus = EXIT_FAILURE;
1049
825
goto fallback;
1050
826
}
1051
827
ret = set_cloexec_flag(pipefd[1]);
1052
828
if(ret < 0){
1053
error(0, errno, "set_cloexec_flag");
1054
close(pipefd[0]);
1055
close(pipefd[1]);
1056
exitstatus = EX_OSERR;
1057
free(direntries[i]);
829
perror("set_cloexec_flag");
830
exitstatus = EXIT_FAILURE;
1058
831
goto fallback;
1059
832
}
1060
#endif /* not O_CLOEXEC */
1061
833
/* Block SIGCHLD until process is safely in process list */
1062
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1063
&sigchld_action.sa_mask,
1064
NULL));
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1065
835
if(ret < 0){
1066
error(0, errno, "sigprocmask");
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
836
perror("sigprocmask");
837
exitstatus = EXIT_FAILURE;
1069
838
goto fallback;
1070
839
}
1071
840
/* Starting a new process to be watched */
1072
pid_t pid;
1073
do {
1074
pid = fork();
1075
} while(pid == -1 and errno == EINTR);
841
pid_t pid = fork();
1076
842
if(pid == -1){
1077
error(0, errno, "fork");
1078
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask, NULL));
1080
close(pipefd[0]);
1081
close(pipefd[1]);
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
1084
845
goto fallback;
1085
846
}
1086
847
if(pid == 0){
1087
848
/* this is the child process */
1088
849
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1089
850
if(ret < 0){
1090
error(0, errno, "sigaction");
1091
_exit(EX_OSERR);
851
perror("sigaction");
852
_exit(EXIT_FAILURE);
1092
853
}
1093
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1094
855
if(ret < 0){
1095
error(0, errno, "sigprocmask");
1096
_exit(EX_OSERR);
856
perror("sigprocmask");
857
_exit(EXIT_FAILURE);
1097
858
}
1098
859
1099
860
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1100
861
if(ret == -1){
1101
error(0, errno, "dup2");
1102
_exit(EX_OSERR);
862
perror("dup2");
863
_exit(EXIT_FAILURE);
1103
864
}
1104
865
1105
if(fexecve(plugin_fd, p->argv,
1106
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1107
error(0, errno, "fexecve for %s/%s",
1108
plugindir != NULL ? plugindir : PDIR,
1109
direntries[i]->d_name);
1110
_exit(EX_OSERR);
866
if(dirfd(dir) < 0){
867
/* If dir has no file descriptor, we could not set FD_CLOEXEC
868
above and must now close it manually here. */
869
closedir(dir);
870
}
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
1111
881
}
1112
882
/* no return */
1113
883
}
1114
884
/* Parent process */
1115
885
close(pipefd[1]); /* Close unused write end of pipe */
1116
close(plugin_fd);
1117
plugin *new_plugin = getplugin(direntries[i]->d_name);
1118
if(new_plugin == NULL){
1119
error(0, errno, "getplugin");
1120
ret = (int)(TEMP_FAILURE_RETRY
1121
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1122
NULL)));
886
free(filename);
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1123
891
if(ret < 0){
1124
error(0, errno, "sigprocmask");
892
perror("sigprocmask");
1125
893
}
1126
exitstatus = EX_OSERR;
1127
free(direntries[i]);
894
exitstatus = EXIT_FAILURE;
1128
895
goto fallback;
1129
896
}
1130
free(direntries[i]);
1131
897
1132
898
new_plugin->pid = pid;
1133
899
new_plugin->fd = pipefd[0];
1134
1135
if(debug){
1136
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1137
new_plugin->name, (intmax_t) (new_plugin->pid));
1138
}
1139
900
1140
901
/* Unblock SIGCHLD so signal handler can be run if this process
1141
902
has already completed */
1142
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1143
&sigchld_action.sa_mask,
1144
NULL));
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1145
904
if(ret < 0){
1146
error(0, errno, "sigprocmask");
1147
exitstatus = EX_OSERR;
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1148
907
goto fallback;
1149
908
}
1150
909
1151
910
FD_SET(new_plugin->fd, &rfds_all);
1152
911
1153
if(maxfd < new_plugin->fd){
912
if (maxfd < new_plugin->fd){
1154
913
maxfd = new_plugin->fd;
1155
914
}
915
1156
916
}
1157
917
1158
free(direntries);
1159
direntries = NULL;
1160
close(dir_fd);
1161
dir_fd = -1;
1162
free_plugin(getplugin(NULL));
1163
918
closedir(dir);
919
dir = NULL;
920
1164
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
1165
922
if(p->pid != 0){
1166
923
break;
1171
928
free_plugin_list();
1172
929
}
1173
930
}
1174
931
1175
932
/* Main loop while running plugins exist */
1176
933
while(plugin_list){
1177
934
fd_set rfds = rfds_all;
1178
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1179
if(select_ret == -1 and errno != EINTR){
1180
error(0, errno, "select");
1181
exitstatus = EX_OSERR;
936
if (select_ret == -1){
937
perror("select");
938
exitstatus = EXIT_FAILURE;
1182
939
goto fallback;
1183
940
}
1184
941
/* OK, now either a process completed, or something can be read
1185
942
from one of them */
1186
for(plugin *proc = plugin_list; proc != NULL;){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1187
944
/* Is this process completely done? */
1188
if(proc->completed and proc->eof){
945
if(proc->eof and proc->completed){
1189
946
/* Only accept the plugin output if it exited cleanly */
1190
947
if(not WIFEXITED(proc->status)
1191
948
or WEXITSTATUS(proc->status) != 0){
1192
949
/* Bad exit by plugin */
1193
950
1194
951
if(debug){
1195
952
if(WIFEXITED(proc->status)){
1196
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1197
" status %d\n", proc->name,
1198
(intmax_t) (proc->pid),
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
1199
955
WEXITSTATUS(proc->status));
1200
} else if(WIFSIGNALED(proc->status)){
1201
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1202
" signal %d: %s\n", proc->name,
1203
(intmax_t) (proc->pid),
1204
WTERMSIG(proc->status),
1205
strsignal(WTERMSIG(proc->status)));
956
} else if(WIFSIGNALED(proc->status)) {
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
960
} else if(WCOREDUMP(proc->status)){
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
1206
963
}
1207
964
}
1208
965
1209
966
/* Remove the plugin */
1210
967
FD_CLR(proc->fd, &rfds_all);
1211
968
1212
969
/* Block signal while modifying process_list */
1213
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1214
(SIG_BLOCK,
1215
&sigchld_action.sa_mask,
1216
NULL));
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1217
971
if(ret < 0){
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
972
perror("sigprocmask");
973
exitstatus = EXIT_FAILURE;
1220
974
goto fallback;
1221
975
}
1222
1223
plugin *next_plugin = proc->next;
1224
976
free_plugin(proc);
1225
proc = next_plugin;
1226
1227
977
/* We are done modifying process list, so unblock signal */
1228
ret = (int)(TEMP_FAILURE_RETRY
1229
(sigprocmask(SIG_UNBLOCK,
1230
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1231
980
if(ret < 0){
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1234
983
goto fallback;
1235
984
}
1236
985
1237
986
if(plugin_list == NULL){
1238
987
break;
1239
988
}
1240
1241
989
continue;
1242
990
}
1243
991
1244
992
/* This process exited nicely, so print its buffer */
1245
993
1246
994
bool bret = print_out_password(proc->buffer,
1247
995
proc->buffer_length);
1248
996
if(not bret){
1249
error(0, errno, "print_out_password");
1250
exitstatus = EX_IOERR;
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
1251
999
}
1252
1000
goto fallback;
1253
1001
}
1255
1003
/* This process has not completed. Does it have any output? */
1256
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1257
1005
/* This process had nothing to say at this time */
1258
proc = proc->next;
1259
1006
continue;
1260
1007
}
1261
1008
/* Before reading, make the process' data buffer large enough */
1262
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1263
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1264
+ (size_t) BUFFER_SIZE);
1265
if(new_buffer == NULL){
1266
error(0, errno, "malloc");
1267
exitstatus = EX_OSERR;
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1013
perror("malloc");
1014
exitstatus = EXIT_FAILURE;
1268
1015
goto fallback;
1269
1016
}
1270
proc->buffer = new_buffer;
1271
1017
proc->buffer_size += BUFFER_SIZE;
1272
1018
}
1273
1019
/* Read from the process */
1274
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1275
proc->buffer
1276
+ proc->buffer_length,
1277
BUFFER_SIZE));
1278
if(sret < 0){
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1021
BUFFER_SIZE);
1022
if(ret < 0){
1279
1023
/* Read error from this process; ignore the error */
1280
proc = proc->next;
1281
1024
continue;
1282
1025
}
1283
if(sret == 0){
1026
if(ret == 0){
1284
1027
/* got EOF */
1285
1028
proc->eof = true;
1286
1029
} else {
1287
proc->buffer_length += (size_t) sret;
1030
proc->buffer_length += (size_t) ret;
1288
1031
}
1289
1032
}
1290
1033
}
1291
1292
1034
1035
1293
1036
fallback:
1294
1037
1295
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1296
and exitstatus != EX_OK)){
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1297
1039
/* Fallback if all plugins failed, none are found or an error
1298
1040
occured */
1299
1041
bool bret;
1300
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1301
1043
char *passwordbuffer = getpass("Password: ");
1302
size_t len = strlen(passwordbuffer);
1303
/* Strip trailing newline */
1304
if(len > 0 and passwordbuffer[len-1] == '\n'){
1305
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1306
len--;
1307
}
1308
bret = print_out_password(passwordbuffer, len);
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1309
1045
if(not bret){
1310
error(0, errno, "print_out_password");
1311
exitstatus = EX_IOERR;
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1312
1048
}
1313
1049
}
1314
1050
1315
1051
/* Restore old signal handler */
1316
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1317
1053
if(ret == -1){
1318
error(0, errno, "sigaction");
1319
exitstatus = EX_OSERR;
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1320
1056
}
1321
1057
1322
1058
if(custom_argv != NULL){
1323
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1324
1060
free(*arg);
1326
1062
free(custom_argv);
1327
1063
}
1328
1064
1329
free(direntries);
1330
1331
if(dir_fd != -1){
1332
close(dir_fd);
1065
if(dir != NULL){
1066
closedir(dir);
1333
1067
}
1334
1068
1335
/* Kill the processes */
1069
/* Free the process list and kill the processes */
1336
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
1071
if(p->pid != 0){
1338
1072
close(p->fd);
1339
1073
ret = kill(p->pid, SIGTERM);
1340
1074
if(ret == -1 and errno != ESRCH){
1341
1075
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1076
perror("kill");
1343
1077
}
1344
1078
}
1345
1079
}
1346
1080
1347
1081
/* Wait for any remaining child processes to terminate */
1348
do {
1082
do{
1349
1083
ret = wait(NULL);
1350
1084
} while(ret >= 0);
1351
1085
if(errno != ECHILD){
1352
error(0, errno, "wait");
1086
perror("wait");
1353
1087
}
1354
1088
1355
1089
free_plugin_list();
1356
1090
1357
1091
free(plugindir);
1358
free(pluginhelperdir);
1359
1092
free(argfile);
1360
1093
1361
1094
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0