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- Committer: Teddy Hogeborn
- Date: 2008-09-04 13:36:59 UTC
- Revision ID: teddy@fukt.bsnet.se-20080904133659-0omre4j6luosb20q
* mandos-clients.conf.xml (OPTIONS): Improved spelling.
* mandos.conf.xml (BUGS): - '' -
* mandos.xml (BUGS): - '' -
* plugin-runner.xml (NAME): Fix spelling by changing wording.
(OPTIONS): Improved spelling.
(EXAMPLE): Do not use obsolete "--keydir" option. Improved wording.
* plugins.d/password-prompt.xml (DESCRIPTION): Improved spelling.
(EXAMPLE): Add <acronym> tag.
(SECURITY): Improved spelling.
* plugins.d/password-request.xml (SYNOPSIS): Changed replaceable to
match OPTIONS section.
(DESCRIPTION, OVERVIEW): Improved spelling.
* mandos.conf.xml (BUGS): - '' -
* mandos.xml (BUGS): - '' -
* plugin-runner.xml (NAME): Fix spelling by changing wording.
(OPTIONS): Improved spelling.
(EXAMPLE): Do not use obsolete "--keydir" option. Improved wording.
* plugins.d/password-prompt.xml (DESCRIPTION): Improved spelling.
(EXAMPLE): Add <acronym> tag.
(SECURITY): Improved spelling.
* plugins.d/password-request.xml (SYNOPSIS): Changed replaceable to
match OPTIONS section.
(DESCRIPTION, OVERVIEW): Improved spelling.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 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(), exit(), EXIT_SUCCESS,
30
realloc() */
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
*/
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
105
97
static plugin *plugin_list = NULL;
106
98
107
/* Gets an existing plugin based on name,
99
/* Gets a 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
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
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;
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
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
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
185
156
/* Malloc check */
186
if(new_array == NULL){
157
if(*array == NULL){
187
158
return false;
188
159
}
189
*array = new_array;
190
160
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
195
162
if(copy == NULL){
196
163
return false;
197
164
}
204
171
}
205
172
206
173
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
174
static bool add_argument(plugin *p, const char *arg){
209
175
if(p == NULL){
210
176
return false;
213
179
}
214
180
215
181
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
182
static bool add_environment(plugin *p, const char *def, bool replace){
218
183
if(p == NULL){
219
184
return false;
221
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
226
191
/* It already exists */
227
192
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
233
195
return false;
234
196
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
237
199
}
238
200
return true;
239
201
}
241
203
return add_to_char_array(def, &(p->environ), &(p->envc));
242
204
}
243
205
244
#ifndef O_CLOEXEC
245
206
/*
246
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
208
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
210
*/
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
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);
253
214
/* If reading the flags failed, return error indication now. */
254
215
if(ret < 0){
255
216
return ret;
256
217
}
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
220
}
261
#endif /* not O_CLOEXEC */
262
221
263
222
264
223
/* Mark processes as completed when they exit, and save their exit
265
224
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
268
226
while(true){
269
227
plugin *proc = plugin_list;
270
228
int status;
274
232
break;
275
233
}
276
234
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
235
if (errno != ECHILD){
236
perror("waitpid");
280
237
}
281
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
282
240
}
283
241
284
242
/* A child exited, find it in process_list */
285
243
while(proc != NULL and proc->pid != pid){
286
244
proc = proc->next;
290
248
continue;
291
249
}
292
250
proc->status = status;
293
proc->completed = 1;
251
proc->completed = true;
294
252
}
295
errno = old_errno;
296
253
}
297
254
298
255
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
301
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
302
261
for(size_t written = 0; written < length; written += (size_t)ret){
303
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
263
length - written));
310
269
}
311
270
312
271
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
272
static void free_plugin(plugin *plugin_node){
315
273
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
275
free(*arg);
318
276
}
319
free(plugin_node->name);
320
277
free(plugin_node->argv);
321
278
for(char **env = plugin_node->environ; *env != NULL; env++){
322
279
free(*env);
323
280
}
324
281
free(plugin_node->environ);
325
282
free(plugin_node->buffer);
326
283
327
284
/* Removes the plugin from the singly-linked list */
328
285
if(plugin_node == plugin_list){
329
286
/* First one - simple */
349
306
350
307
int main(int argc, char *argv[]){
351
308
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
309
char *argfile = NULL;
354
310
FILE *conffp;
355
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
356
314
struct stat st;
357
315
fd_set rfds_all;
358
316
int ret, maxfd = 0;
359
ssize_t sret;
360
317
uid_t uid = 65534;
361
318
gid_t gid = 65534;
362
319
bool debug = false;
366
323
.sa_flags = SA_NOCLDSTOP };
367
324
char **custom_argv = NULL;
368
325
int custom_argc = 0;
369
int dir_fd = -1;
370
326
371
327
/* Establish a signal handler */
372
328
sigemptyset(&sigchld_action.sa_mask);
373
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
330
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
377
333
goto fallback;
378
334
}
379
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
336
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
383
339
goto fallback;
384
340
}
385
341
417
373
.doc = "Group ID the plugins will run as", .group = 3 },
418
374
{ .name = "debug", .key = 132,
419
375
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
433
376
{ .name = NULL }
434
377
};
435
378
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
442
382
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
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;
448
392
}
449
393
}
450
errno = 0;
451
394
}
452
395
break;
453
396
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
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
}
456
408
}
457
409
break;
458
410
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
477
430
}
478
431
}
479
errno = 0;
480
432
}
481
433
break;
482
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
483
438
{
484
439
char *envdef = strchr(arg, ':');
485
440
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
491
447
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
499
450
}
500
451
}
501
452
break;
502
453
case 'd': /* --disable */
503
{
454
if (arg != NULL){
504
455
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
508
458
}
459
p->disabled = true;
509
460
}
510
461
break;
511
462
case 'e': /* --enable */
512
{
463
if (arg != NULL){
513
464
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
517
467
}
468
p->disabled = false;
518
469
}
519
470
break;
520
471
case 128: /* --plugin-dir */
521
free(plugindir);
522
472
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
473
if(plugindir == NULL){
474
perror("strdup");
475
}
526
476
break;
527
477
case 129: /* --config-file */
528
478
/* This is already done by parse_opt_config_file() */
529
479
break;
530
480
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
481
uid = (uid_t)strtol(arg, NULL, 10);
540
482
break;
541
483
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
484
gid = (gid_t)strtol(arg, NULL, 10);
551
485
break;
552
486
case 132: /* --debug */
553
487
debug = true;
554
488
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
489
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
594
494
default:
595
495
return ARGP_ERR_UNKNOWN;
596
496
}
597
return errno; /* Set to 0 at start */
497
return 0;
598
498
}
599
499
600
500
/* This option parser is the same as parse_opt() above, except it
601
501
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
607
506
case 'g': /* --global-options */
608
507
case 'G': /* --global-env */
609
508
case 'o': /* --options-for */
613
512
case 128: /* --plugin-dir */
614
513
break;
615
514
case 129: /* --config-file */
616
free(argfile);
617
515
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
516
if(argfile == NULL){
517
perror("strdup");
620
518
}
621
break;
519
break;
622
520
case 130: /* --userid */
623
521
case 131: /* --groupid */
624
522
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
629
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
630
525
break;
631
526
default:
632
527
return ARGP_ERR_UNKNOWN;
633
528
}
634
return errno;
529
return 0;
635
530
}
636
531
637
532
struct argp argp = { .options = options,
639
534
.args_doc = "",
640
535
.doc = "Mandos plugin runner -- Run plugins" };
641
536
642
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
643
538
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
658
543
goto fallback;
659
544
}
660
545
662
547
argp.parser = parse_opt;
663
548
664
549
/* Open the configfile if available */
665
if(argfile == NULL){
550
if (argfile == NULL){
666
551
conffp = fopen(AFILE, "r");
667
552
} else {
668
553
conffp = fopen(argfile, "r");
669
}
554
}
670
555
if(conffp != NULL){
671
556
char *org_line = NULL;
672
557
char *p, *arg, *new_arg, *line;
673
558
size_t size = 0;
559
ssize_t sret;
674
560
const char whitespace_delims[] = " \r\t\f\v\n";
675
561
const char comment_delim[] = "#";
676
562
677
563
custom_argc = 1;
678
564
custom_argv = malloc(sizeof(char*) * 2);
679
565
if(custom_argv == NULL){
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
682
568
goto fallback;
683
569
}
684
570
custom_argv[0] = argv[0];
685
571
custom_argv[1] = NULL;
686
572
687
573
/* for each line in the config file, strip whitespace and ignore
688
574
commented text */
689
575
while(true){
691
577
if(sret == -1){
692
578
break;
693
579
}
694
580
695
581
line = org_line;
696
582
arg = strsep(&line, comment_delim);
697
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
700
586
}
701
587
new_arg = strdup(p);
702
588
if(new_arg == NULL){
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
705
591
free(org_line);
706
592
goto fallback;
707
593
}
708
594
709
595
custom_argc += 1;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
722
603
}
723
604
custom_argv[custom_argc-1] = new_arg;
724
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
725
606
}
726
607
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
735
608
free(org_line);
736
609
} else {
737
610
/* Check for harmful errors and go to fallback. Other errors might
738
611
not affect opening plugins */
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
742
615
goto fallback;
743
616
}
744
617
}
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
747
620
if(custom_argv != NULL){
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
762
626
goto fallback;
763
627
}
764
628
}
765
629
766
630
/* Parse actual command line arguments, to let them override the
767
631
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
801
637
}
802
638
803
639
if(debug){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
642
p->name ? p->name : "Global", p->argc - 1);
807
643
for(char **a = p->argv; *a != NULL; a++){
808
644
fprintf(stderr, "\tArg: %s\n", *a);
809
645
}
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
811
647
for(char **a = p->environ; *a != NULL; a++){
812
648
fprintf(stderr, "\t%s\n", *a);
813
649
}
814
650
}
815
651
}
816
652
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
653
/* Strip permissions down to nobody */
846
654
ret = setuid(uid);
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
852
676
{
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
897
684
}
898
685
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
909
686
}
910
687
911
688
FD_ZERO(&rfds_all);
912
689
913
690
/* Read and execute any executable in the plugin directory*/
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
930
763
/* Ignore non-executable files */
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
765
if(debug){
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
939
768
}
940
close(plugin_fd);
941
free(direntries[i]);
769
free(filename);
942
770
continue;
943
771
}
944
772
945
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
946
774
if(p == NULL){
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
775
perror("getplugin");
776
free(filename);
950
777
continue;
951
778
}
952
779
if(p->disabled){
953
780
if(debug){
954
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
955
direntries[i]->d_name);
782
dirst->d_name);
956
783
}
957
close(plugin_fd);
958
free(direntries[i]);
784
free(filename);
959
785
continue;
960
786
}
961
787
{
964
790
if(g != NULL){
965
791
for(char **a = g->argv + 1; *a != NULL; a++){
966
792
if(not add_argument(p, *a)){
967
error(0, errno, "add_argument");
793
perror("add_argument");
968
794
}
969
795
}
970
796
/* Add global environment variables */
971
797
for(char **e = g->environ; *e != NULL; e++){
972
798
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
799
perror("add_environment");
974
800
}
975
801
}
976
802
}
977
803
}
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
980
807
if(p->environ[0] != NULL){
981
808
for(char **e = environ; *e != NULL; e++){
982
809
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
810
perror("add_environment");
984
811
}
985
812
}
986
813
}
987
814
988
815
int pipefd[2];
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
1010
822
/* Ask OS to automatic close the pipe on exec */
1011
823
ret = set_cloexec_flag(pipefd[0]);
1012
824
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1018
827
goto fallback;
1019
828
}
1020
829
ret = set_cloexec_flag(pipefd[1]);
1021
830
if(ret < 0){
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1027
833
goto fallback;
1028
834
}
1029
#endif /* not O_CLOEXEC */
1030
835
/* Block SIGCHLD until process is safely in process list */
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
837
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1038
840
goto fallback;
1039
841
}
1040
842
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1045
844
if(pid == -1){
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1053
847
goto fallback;
1054
848
}
1055
849
if(pid == 0){
1056
850
/* this is the child process */
1057
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
852
if(ret < 0){
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1061
855
}
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1063
857
if(ret < 0){
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1066
860
}
1067
861
1068
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1069
863
if(ret == -1){
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1072
866
}
1073
867
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1080
883
}
1081
884
/* no return */
1082
885
}
1083
886
/* Parent process */
1084
887
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
893
if(ret < 0){
1093
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1094
895
}
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1097
897
goto fallback;
1098
898
}
1099
free(direntries[i]);
1100
899
1101
900
new_plugin->pid = pid;
1102
901
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
902
1109
903
/* Unblock SIGCHLD so signal handler can be run if this process
1110
904
has already completed */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
906
if(ret < 0){
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1117
909
goto fallback;
1118
910
}
1119
911
1120
912
FD_SET(new_plugin->fd, &rfds_all);
1121
913
1122
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1123
915
maxfd = new_plugin->fd;
1124
916
}
917
1125
918
}
1126
919
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
920
closedir(dir);
921
dir = NULL;
922
1133
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1134
924
if(p->pid != 0){
1135
925
break;
1140
930
free_plugin_list();
1141
931
}
1142
932
}
1143
933
1144
934
/* Main loop while running plugins exist */
1145
935
while(plugin_list){
1146
936
fd_set rfds = rfds_all;
1147
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1151
941
goto fallback;
1152
942
}
1153
943
/* OK, now either a process completed, or something can be read
1154
944
from one of them */
1155
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1156
946
/* Is this process completely done? */
1157
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1158
948
/* Only accept the plugin output if it exited cleanly */
1159
949
if(not WIFEXITED(proc->status)
1160
950
or WEXITSTATUS(proc->status) != 0){
1161
951
/* Bad exit by plugin */
1162
952
1163
953
if(debug){
1164
954
if(WIFEXITED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1168
957
WEXITSTATUS(proc->status));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
962
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1175
965
}
1176
966
}
1177
967
1178
968
/* Remove the plugin */
1179
969
FD_CLR(proc->fd, &rfds_all);
1180
970
1181
971
/* Block signal while modifying process_list */
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1186
973
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1189
976
goto fallback;
1190
977
}
1191
1192
plugin *next_plugin = proc->next;
1193
978
free_plugin(proc);
1194
proc = next_plugin;
1195
1196
979
/* We are done modifying process list, so unblock signal */
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1200
982
if(ret < 0){
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1203
985
goto fallback;
1204
986
}
1205
987
1206
988
if(plugin_list == NULL){
1207
989
break;
1208
990
}
1209
1210
991
continue;
1211
992
}
1212
993
1213
994
/* This process exited nicely, so print its buffer */
1214
995
1215
996
bool bret = print_out_password(proc->buffer,
1216
997
proc->buffer_length);
1217
998
if(not bret){
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1220
1001
}
1221
1002
goto fallback;
1222
1003
}
1224
1005
/* This process has not completed. Does it have any output? */
1225
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1226
1007
/* This process had nothing to say at this time */
1227
proc = proc->next;
1228
1008
continue;
1229
1009
}
1230
1010
/* Before reading, make the process' data buffer large enough */
1231
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1237
1017
goto fallback;
1238
1018
}
1239
proc->buffer = new_buffer;
1240
1019
proc->buffer_size += BUFFER_SIZE;
1241
1020
}
1242
1021
/* Read from the process */
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1248
1025
/* Read error from this process; ignore the error */
1249
proc = proc->next;
1250
1026
continue;
1251
1027
}
1252
if(sret == 0){
1028
if(ret == 0){
1253
1029
/* got EOF */
1254
1030
proc->eof = true;
1255
1031
} else {
1256
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1257
1033
}
1258
1034
}
1259
1035
}
1260
1261
1036
1037
1262
1038
fallback:
1263
1039
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1266
1041
/* Fallback if all plugins failed, none are found or an error
1267
1042
occured */
1268
1043
bool bret;
1269
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1270
1045
char *passwordbuffer = getpass("Password: ");
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1278
1047
if(not bret){
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1281
1050
}
1282
1051
}
1283
1052
1284
1053
/* Restore old signal handler */
1285
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
1055
if(ret == -1){
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1289
1058
}
1290
1059
1291
1060
if(custom_argv != NULL){
1292
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1293
1062
free(*arg);
1295
1064
free(custom_argv);
1296
1065
}
1297
1066
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1067
if(dir != NULL){
1068
closedir(dir);
1302
1069
}
1303
1070
1304
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1305
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1306
1073
if(p->pid != 0){
1307
1074
close(p->fd);
1308
1075
ret = kill(p->pid, SIGTERM);
1309
1076
if(ret == -1 and errno != ESRCH){
1310
1077
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1078
perror("kill");
1312
1079
}
1313
1080
}
1314
1081
}
1315
1082
1316
1083
/* Wait for any remaining child processes to terminate */
1317
do {
1084
do{
1318
1085
ret = wait(NULL);
1319
1086
} while(ret >= 0);
1320
1087
if(errno != ECHILD){
1321
error(0, errno, "wait");
1088
perror("wait");
1322
1089
}
1323
1090
1324
1091
free_plugin_list();
1325
1092
1326
1093
free(plugindir);
1327
free(pluginhelperdir);
1328
1094
free(argfile);
1329
1095
1330
1096
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0