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- Committer: Teddy Hogeborn
- Date: 2008-09-17 00:36:05 UTC
- mfrom: (24.1.95 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080917003605-m64km1tbwn3wrpbf
Merge.
- files added:
- etc-plugins.d-README
- files removed:
- DBUS-API
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
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
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
42
26
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
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() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
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() */
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
89
66
90
67
#define BUFFER_SIZE 256
91
68
92
69
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
71
96
const char *argp_program_version = "plugin-runner " VERSION;
97
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;
98
76
99
77
typedef struct plugin{
100
78
char *name; /* can be NULL or any plugin name */
103
81
char **environ;
104
82
int envc;
105
83
bool disabled;
106
84
107
85
/* Variables used for running processes*/
108
86
pid_t pid;
109
87
int fd;
111
89
size_t buffer_size;
112
90
size_t buffer_length;
113
91
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
92
volatile bool completed;
93
volatile int status;
116
94
struct plugin *next;
117
95
} plugin;
118
96
120
98
121
99
/* Gets an existing plugin based on name,
122
100
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
101
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
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))){
129
106
return p;
130
107
}
131
108
}
132
109
/* Create a new plugin */
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
138
112
return NULL;
139
113
}
140
114
char *copy_name = NULL;
141
115
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
145
117
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
118
return NULL;
150
119
}
151
120
}
152
121
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
157
126
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
163
129
free(copy_name);
164
130
free(new_plugin);
165
errno = e;
166
131
return NULL;
167
132
}
168
133
new_plugin->argv[0] = copy_name;
169
134
new_plugin->argv[1] = NULL;
170
135
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
174
137
if(new_plugin->environ == NULL){
175
int e = errno;
176
138
free(copy_name);
177
139
free(new_plugin->argv);
178
140
free(new_plugin);
179
errno = e;
180
141
return NULL;
181
142
}
182
143
new_plugin->environ[0] = NULL;
187
148
}
188
149
189
150
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
151
static bool add_to_char_array(const char *new, char ***array,
192
152
int *len){
193
153
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
210
156
/* Malloc check */
211
if(new_array == NULL){
157
if(*array == NULL){
212
158
return false;
213
159
}
214
*array = new_array;
215
160
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
220
162
if(copy == NULL){
221
163
return false;
222
164
}
229
171
}
230
172
231
173
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
174
static bool add_argument(plugin *p, const char *arg){
234
175
if(p == NULL){
235
176
return false;
238
179
}
239
180
240
181
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
182
static bool add_environment(plugin *p, const char *def, bool replace){
243
183
if(p == NULL){
244
184
return false;
246
186
/* namelen = length of name of environment variable */
247
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
188
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
251
191
/* It already exists */
252
192
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
258
195
return false;
259
196
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
262
199
}
263
200
return true;
264
201
}
266
203
return add_to_char_array(def, &(p->environ), &(p->envc));
267
204
}
268
205
269
#ifndef O_CLOEXEC
270
206
/*
271
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
208
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
210
*/
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
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);
278
214
/* If reading the flags failed, return error indication now. */
279
215
if(ret < 0){
280
216
return ret;
281
217
}
282
218
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
220
}
286
#endif /* not O_CLOEXEC */
287
221
288
222
289
223
/* Mark processes as completed when they exit, and save their exit
290
224
status. */
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
293
226
while(true){
294
227
plugin *proc = plugin_list;
295
228
int status;
299
232
break;
300
233
}
301
234
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
235
if (errno != ECHILD){
236
perror("waitpid");
305
237
}
306
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
307
240
}
308
241
309
242
/* A child exited, find it in process_list */
315
248
continue;
316
249
}
317
250
proc->status = status;
318
proc->completed = 1;
251
proc->completed = true;
319
252
}
320
errno = old_errno;
321
253
}
322
254
323
255
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
326
257
ssize_t ret;
327
258
for(size_t written = 0; written < length; written += (size_t)ret){
328
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
335
266
}
336
267
337
268
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
269
static void free_plugin(plugin *plugin_node){
340
270
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
272
free(*arg);
343
273
}
344
free(plugin_node->name);
345
274
free(plugin_node->argv);
346
275
for(char **env = plugin_node->environ; *env != NULL; env++){
347
276
free(*env);
348
277
}
349
278
free(plugin_node->environ);
350
279
free(plugin_node->buffer);
351
280
352
281
/* Removes the plugin from the singly-linked list */
353
282
if(plugin_node == plugin_list){
354
283
/* First one - simple */
374
303
375
304
int main(int argc, char *argv[]){
376
305
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
306
char *argfile = NULL;
379
307
FILE *conffp;
380
struct dirent **direntries = NULL;
308
size_t d_name_len;
309
DIR *dir = NULL;
310
struct dirent *dirst;
381
311
struct stat st;
382
312
fd_set rfds_all;
383
313
int ret, maxfd = 0;
384
ssize_t sret;
385
314
uid_t uid = 65534;
386
315
gid_t gid = 65534;
387
316
bool debug = false;
391
320
.sa_flags = SA_NOCLDSTOP };
392
321
char **custom_argv = NULL;
393
322
int custom_argc = 0;
394
int dir_fd = -1;
395
323
396
324
/* Establish a signal handler */
397
325
sigemptyset(&sigchld_action.sa_mask);
398
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
327
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
402
330
goto fallback;
403
331
}
404
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
333
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
408
336
goto fallback;
409
337
}
410
338
442
370
.doc = "Group ID the plugins will run as", .group = 3 },
443
371
{ .name = "debug", .key = 132,
444
372
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
458
373
{ .name = NULL }
459
374
};
460
375
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
467
379
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
473
389
}
474
390
}
475
errno = 0;
476
391
}
477
392
break;
478
393
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
481
399
}
482
400
break;
483
401
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
502
}
503
}
504
errno = 0;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
505
421
}
506
422
break;
507
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
508
427
{
509
428
char *envdef = strchr(arg, ':');
510
429
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
430
break;
514
431
}
515
432
*envdef = '\0';
516
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
524
435
}
525
436
}
526
437
break;
527
438
case 'd': /* --disable */
528
{
439
if (arg != NULL){
529
440
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
533
443
}
444
p->disabled = true;
534
445
}
535
446
break;
536
447
case 'e': /* --enable */
537
{
448
if (arg != NULL){
538
449
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
542
452
}
453
p->disabled = false;
543
454
}
544
455
break;
545
456
case 128: /* --plugin-dir */
546
457
free(plugindir);
547
458
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
459
if(plugindir == NULL){
460
perror("strdup");
461
}
551
462
break;
552
463
case 129: /* --config-file */
553
464
/* This is already done by parse_opt_config_file() */
554
465
break;
555
466
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
467
uid = (uid_t)strtol(arg, NULL, 10);
565
468
break;
566
469
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
470
gid = (gid_t)strtol(arg, NULL, 10);
576
471
break;
577
472
case 132: /* --debug */
578
473
debug = true;
579
474
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
607
475
case ARGP_KEY_ARG:
608
476
/* Cryptsetup always passes an argument, which is an empty
609
477
string if "none" was specified in /etc/crypttab. So if
610
478
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
613
481
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
482
break;
483
case ARGP_KEY_END:
484
break;
619
485
default:
620
486
return ARGP_ERR_UNKNOWN;
621
487
}
622
return errno; /* Set to 0 at start */
488
return 0;
623
489
}
624
490
625
491
/* This option parser is the same as parse_opt() above, except it
626
492
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
632
497
case 'g': /* --global-options */
633
498
case 'G': /* --global-env */
634
499
case 'o': /* --options-for */
640
505
case 129: /* --config-file */
641
506
free(argfile);
642
507
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
508
if(argfile == NULL){
509
perror("strdup");
645
510
}
646
break;
511
break;
647
512
case 130: /* --userid */
648
513
case 131: /* --groupid */
649
514
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
655
517
break;
656
518
default:
657
519
return ARGP_ERR_UNKNOWN;
658
520
}
659
return errno;
521
return 0;
660
522
}
661
523
662
524
struct argp argp = { .options = options,
664
526
.args_doc = "",
665
527
.doc = "Mandos plugin runner -- Run plugins" };
666
528
667
/* Parse using parse_opt_config_file() in order to get the custom
529
/* Parse using the parse_opt_config_file in order to get the custom
668
530
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
683
535
goto fallback;
684
536
}
685
537
687
539
argp.parser = parse_opt;
688
540
689
541
/* Open the configfile if available */
690
if(argfile == NULL){
542
if (argfile == NULL){
691
543
conffp = fopen(AFILE, "r");
692
544
} else {
693
545
conffp = fopen(argfile, "r");
694
}
546
}
695
547
if(conffp != NULL){
696
548
char *org_line = NULL;
697
549
char *p, *arg, *new_arg, *line;
698
550
size_t size = 0;
551
ssize_t sret;
699
552
const char whitespace_delims[] = " \r\t\f\v\n";
700
553
const char comment_delim[] = "#";
701
554
702
555
custom_argc = 1;
703
556
custom_argv = malloc(sizeof(char*) * 2);
704
557
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
707
560
goto fallback;
708
561
}
709
562
custom_argv[0] = argv[0];
710
563
custom_argv[1] = NULL;
711
564
712
565
/* for each line in the config file, strip whitespace and ignore
713
566
commented text */
714
567
while(true){
716
569
if(sret == -1){
717
570
break;
718
571
}
719
572
720
573
line = org_line;
721
574
arg = strsep(&line, comment_delim);
722
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
725
578
}
726
579
new_arg = strdup(p);
727
580
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
730
583
free(org_line);
731
584
goto fallback;
732
585
}
733
586
734
587
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
758
595
}
759
596
custom_argv[custom_argc-1] = new_arg;
760
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
761
598
}
762
599
}
763
do {
764
ret = fclose(conffp);
765
} while(ret == EOF and errno == EINTR);
766
if(ret == EOF){
767
error(0, errno, "fclose");
768
exitstatus = EX_IOERR;
769
goto fallback;
770
}
771
600
free(org_line);
772
601
} else {
773
602
/* Check for harmful errors and go to fallback. Other errors might
774
603
not affect opening plugins */
775
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
776
error(0, errno, "fopen");
777
exitstatus = EX_OSERR;
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
778
607
goto fallback;
779
608
}
780
609
}
781
/* If there were any arguments from the configuration file, pass
782
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
783
612
if(custom_argv != NULL){
784
ret = argp_parse(&argp, custom_argc, custom_argv,
785
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
786
NULL, NULL);
787
switch(ret){
788
case 0:
789
break;
790
case ENOMEM:
791
default:
792
errno = ret;
793
error(0, errno, "argp_parse");
794
exitstatus = EX_OSERR;
795
goto fallback;
796
case EINVAL:
797
exitstatus = EX_CONFIG;
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
798
618
goto fallback;
799
619
}
800
620
}
801
621
802
622
/* Parse actual command line arguments, to let them override the
803
623
config file */
804
ret = argp_parse(&argp, argc, argv,
805
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
806
NULL, NULL);
807
switch(ret){
808
case 0:
809
break;
810
case ENOMEM:
811
default:
812
errno = ret;
813
error(0, errno, "argp_parse");
814
exitstatus = EX_OSERR;
815
goto fallback;
816
case EINVAL:
817
exitstatus = EX_USAGE;
818
goto fallback;
819
}
820
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
837
629
}
838
630
839
631
if(debug){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
632
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
633
fprintf(stderr, "Plugin: %s has %d arguments\n",
842
634
p->name ? p->name : "Global", p->argc - 1);
843
635
for(char **a = p->argv; *a != NULL; a++){
844
636
fprintf(stderr, "\tArg: %s\n", *a);
845
637
}
846
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
847
639
for(char **a = p->environ; *a != NULL; a++){
848
640
fprintf(stderr, "\t%s\n", *a);
849
641
}
850
642
}
851
643
}
852
644
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
888
if(ret == -1){
889
error(0, errno, "setgid");
890
}
645
/* Strip permissions down to nobody */
891
646
ret = setuid(uid);
892
if(ret == -1){
893
error(0, errno, "setuid");
894
}
895
896
/* Open plugin directory with close_on_exec flag */
647
if (ret == -1){
648
perror("setuid");
649
}
650
setgid(gid);
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
897
668
{
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
905
if(dir_fd == -1){
906
error(0, errno, "Could not open plugin dir");
907
exitstatus = EX_UNAVAILABLE;
908
goto fallback;
909
}
910
911
#ifndef O_CLOEXEC
912
/* Set the FD_CLOEXEC flag on the directory */
913
ret = set_cloexec_flag(dir_fd);
914
if(ret < 0){
915
error(0, errno, "set_cloexec_flag");
916
exitstatus = EX_OSERR;
917
goto fallback;
918
}
919
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
942
676
}
943
677
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
954
678
}
955
679
956
680
FD_ZERO(&rfds_all);
957
681
958
682
/* Read and execute any executable in the plugin directory*/
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
965
continue;
966
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
968
if(ret == -1){
969
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
683
while(true){
684
dirst = readdir(dir);
685
686
/* All directory entries have been processed */
687
if(dirst == NULL){
688
if (errno == EBADF){
689
perror("readdir");
690
exitstatus = EXIT_FAILURE;
691
goto fallback;
692
}
693
break;
694
}
695
696
d_name_len = strlen(dirst->d_name);
697
698
/* Ignore dotfiles, backup files and other junk */
699
{
700
bool bad_name = false;
701
702
const char const *bad_prefixes[] = { ".", "#", NULL };
703
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
705
".dpkg-old",
706
".dpkg-divert", NULL };
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
size_t pre_len = strlen(*pre);
709
if((d_name_len >= pre_len)
710
and strncmp((dirst->d_name), *pre, pre_len) == 0){
711
if(debug){
712
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
713
" with bad prefix %s\n", dirst->d_name, *pre);
714
}
715
bad_name = true;
716
break;
717
}
718
}
719
if(bad_name){
720
continue;
721
}
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
size_t suf_len = strlen(*suf);
724
if((d_name_len >= suf_len)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
726
== 0)){
727
if(debug){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad suffix %s\n", dirst->d_name, *suf);
730
}
731
bad_name = true;
732
break;
733
}
734
}
735
736
if(bad_name){
737
continue;
738
}
739
}
740
741
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
747
if(ret < 0){
748
perror("asprintf");
749
continue;
750
}
751
752
ret = stat(filename, &st);
753
if (ret == -1){
754
perror("stat");
755
free(filename);
756
continue;
757
}
758
975
759
/* Ignore non-executable files */
976
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
979
761
if(debug){
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
" with bad type or mode\n", filename);
984
764
}
985
close(plugin_fd);
986
free(direntries[i]);
765
free(filename);
987
766
continue;
988
767
}
989
768
990
plugin *p = getplugin(direntries[i]->d_name);
769
plugin *p = getplugin(dirst->d_name);
991
770
if(p == NULL){
992
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
771
perror("getplugin");
772
free(filename);
995
773
continue;
996
774
}
997
775
if(p->disabled){
998
776
if(debug){
999
777
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1000
direntries[i]->d_name);
778
dirst->d_name);
1001
779
}
1002
close(plugin_fd);
1003
free(direntries[i]);
780
free(filename);
1004
781
continue;
1005
782
}
1006
783
{
1009
786
if(g != NULL){
1010
787
for(char **a = g->argv + 1; *a != NULL; a++){
1011
788
if(not add_argument(p, *a)){
1012
error(0, errno, "add_argument");
789
perror("add_argument");
1013
790
}
1014
791
}
1015
792
/* Add global environment variables */
1016
793
for(char **e = g->environ; *e != NULL; e++){
1017
794
if(not add_environment(p, *e, false)){
1018
error(0, errno, "add_environment");
795
perror("add_environment");
1019
796
}
1020
797
}
1021
798
}
1022
799
}
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
800
/* If this plugin has any environment variables, we will call
801
using execve and need to duplicate the environment from this
802
process, too. */
1025
803
if(p->environ[0] != NULL){
1026
804
for(char **e = environ; *e != NULL; e++){
1027
805
if(not add_environment(p, *e, false)){
1028
error(0, errno, "add_environment");
806
perror("add_environment");
1029
807
}
1030
808
}
1031
809
}
1032
810
1033
811
int pipefd[2];
1034
#ifndef O_CLOEXEC
1035
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
if(ret == -1){
1040
error(0, errno, "pipe");
1041
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
816
goto fallback;
817
}
1055
818
/* Ask OS to automatic close the pipe on exec */
1056
819
ret = set_cloexec_flag(pipefd[0]);
1057
820
if(ret < 0){
1058
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
exitstatus = EX_OSERR;
1062
free(direntries[i]);
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1063
823
goto fallback;
1064
824
}
1065
825
ret = set_cloexec_flag(pipefd[1]);
1066
826
if(ret < 0){
1067
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
exitstatus = EX_OSERR;
1071
free(direntries[i]);
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1072
829
goto fallback;
1073
830
}
1074
#endif /* not O_CLOEXEC */
1075
831
/* Block SIGCHLD until process is safely in process list */
1076
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
&sigchld_action.sa_mask,
1078
NULL));
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1079
833
if(ret < 0){
1080
error(0, errno, "sigprocmask");
1081
exitstatus = EX_OSERR;
1082
free(direntries[i]);
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1083
836
goto fallback;
1084
837
}
1085
838
/* Starting a new process to be watched */
1086
pid_t pid;
1087
do {
1088
pid = fork();
1089
} while(pid == -1 and errno == EINTR);
839
pid_t pid = fork();
1090
840
if(pid == -1){
1091
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
exitstatus = EX_OSERR;
1097
free(direntries[i]);
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
1098
843
goto fallback;
1099
844
}
1100
845
if(pid == 0){
1101
846
/* this is the child process */
1102
847
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1103
848
if(ret < 0){
1104
error(0, errno, "sigaction");
1105
_exit(EX_OSERR);
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1106
851
}
1107
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1108
853
if(ret < 0){
1109
error(0, errno, "sigprocmask");
1110
_exit(EX_OSERR);
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1111
856
}
1112
857
1113
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1114
859
if(ret == -1){
1115
error(0, errno, "dup2");
1116
_exit(EX_OSERR);
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1117
862
}
1118
863
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
864
if(dirfd(dir) < 0){
865
/* If dir has no file descriptor, we could not set FD_CLOEXEC
866
above and must now close it manually here. */
867
closedir(dir);
868
}
869
if(p->environ[0] == NULL){
870
if(execv(filename, p->argv) < 0){
871
perror("execv");
872
_exit(EXIT_FAILURE);
873
}
874
} else {
875
if(execve(filename, p->argv, p->environ) < 0){
876
perror("execve");
877
_exit(EXIT_FAILURE);
878
}
1125
879
}
1126
880
/* no return */
1127
881
}
1128
882
/* Parent process */
1129
883
close(pipefd[1]); /* Close unused write end of pipe */
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1132
if(new_plugin == NULL){
1133
error(0, errno, "getplugin");
1134
ret = (int)(TEMP_FAILURE_RETRY
1135
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1136
NULL)));
884
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1137
889
if(ret < 0){
1138
error(0, errno, "sigprocmask");
890
perror("sigprocmask");
1139
891
}
1140
exitstatus = EX_OSERR;
1141
free(direntries[i]);
892
exitstatus = EXIT_FAILURE;
1142
893
goto fallback;
1143
894
}
1144
free(direntries[i]);
1145
895
1146
896
new_plugin->pid = pid;
1147
897
new_plugin->fd = pipefd[0];
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
898
1154
899
/* Unblock SIGCHLD so signal handler can be run if this process
1155
900
has already completed */
1156
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1157
&sigchld_action.sa_mask,
1158
NULL));
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1159
902
if(ret < 0){
1160
error(0, errno, "sigprocmask");
1161
exitstatus = EX_OSERR;
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1162
905
goto fallback;
1163
906
}
1164
907
1165
908
FD_SET(new_plugin->fd, &rfds_all);
1166
909
1167
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1168
911
maxfd = new_plugin->fd;
1169
912
}
913
1170
914
}
1171
915
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1176
free_plugin(getplugin(NULL));
1177
916
closedir(dir);
917
dir = NULL;
918
1178
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1179
920
if(p->pid != 0){
1180
921
break;
1185
926
free_plugin_list();
1186
927
}
1187
928
}
1188
929
1189
930
/* Main loop while running plugins exist */
1190
931
while(plugin_list){
1191
932
fd_set rfds = rfds_all;
1192
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1193
if(select_ret == -1 and errno != EINTR){
1194
error(0, errno, "select");
1195
exitstatus = EX_OSERR;
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1196
937
goto fallback;
1197
938
}
1198
939
/* OK, now either a process completed, or something can be read
1199
940
from one of them */
1200
941
for(plugin *proc = plugin_list; proc != NULL;){
1201
942
/* Is this process completely done? */
1202
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1203
944
/* Only accept the plugin output if it exited cleanly */
1204
945
if(not WIFEXITED(proc->status)
1205
946
or WEXITSTATUS(proc->status) != 0){
1206
947
/* Bad exit by plugin */
1207
948
1208
949
if(debug){
1209
950
if(WIFEXITED(proc->status)){
1210
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1211
" status %d\n", proc->name,
1212
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1213
953
WEXITSTATUS(proc->status));
1214
} else if(WIFSIGNALED(proc->status)){
1215
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1216
" signal %d: %s\n", proc->name,
1217
(intmax_t) (proc->pid),
1218
WTERMSIG(proc->status),
1219
strsignal(WTERMSIG(proc->status)));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
958
} else if(WCOREDUMP(proc->status)){
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1220
961
}
1221
962
}
1222
963
1223
964
/* Remove the plugin */
1224
965
FD_CLR(proc->fd, &rfds_all);
1225
966
1226
967
/* Block signal while modifying process_list */
1227
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1228
(SIG_BLOCK,
1229
&sigchld_action.sa_mask,
1230
NULL));
1231
if(ret < 0){
1232
error(0, errno, "sigprocmask");
1233
exitstatus = EX_OSERR;
1234
goto fallback;
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1235
986
}
1236
987
1237
988
plugin *next_plugin = proc->next;
1238
989
free_plugin(proc);
1239
990
proc = next_plugin;
1240
1241
/* We are done modifying process list, so unblock signal */
1242
ret = (int)(TEMP_FAILURE_RETRY
1243
(sigprocmask(SIG_UNBLOCK,
1244
&sigchld_action.sa_mask, NULL)));
1245
if(ret < 0){
1246
error(0, errno, "sigprocmask");
1247
exitstatus = EX_OSERR;
1248
goto fallback;
1249
}
1250
1251
if(plugin_list == NULL){
1252
break;
1253
}
1254
1255
991
continue;
1256
992
}
1257
993
1258
994
/* This process exited nicely, so print its buffer */
1259
995
1260
996
bool bret = print_out_password(proc->buffer,
1261
997
proc->buffer_length);
1262
998
if(not bret){
1263
error(0, errno, "print_out_password");
1264
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1265
1001
}
1266
1002
goto fallback;
1267
1003
}
1274
1010
}
1275
1011
/* Before reading, make the process' data buffer large enough */
1276
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1280
error(0, errno, "malloc");
1281
exitstatus = EX_OSERR;
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1016
perror("malloc");
1017
exitstatus = EXIT_FAILURE;
1282
1018
goto fallback;
1283
1019
}
1284
proc->buffer = new_buffer;
1285
1020
proc->buffer_size += BUFFER_SIZE;
1286
1021
}
1287
1022
/* Read from the process */
1288
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1289
proc->buffer
1290
+ proc->buffer_length,
1291
BUFFER_SIZE));
1292
if(sret < 0){
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1293
1026
/* Read error from this process; ignore the error */
1294
1027
proc = proc->next;
1295
1028
continue;
1296
1029
}
1297
if(sret == 0){
1030
if(ret == 0){
1298
1031
/* got EOF */
1299
1032
proc->eof = true;
1300
1033
} else {
1301
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1302
1035
}
1303
1036
}
1304
1037
}
1305
1306
1038
1039
1307
1040
fallback:
1308
1041
1309
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1310
and exitstatus != EX_OK)){
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1311
1043
/* Fallback if all plugins failed, none are found or an error
1312
1044
occured */
1313
1045
bool bret;
1321
1053
}
1322
1054
bret = print_out_password(passwordbuffer, len);
1323
1055
if(not bret){
1324
error(0, errno, "print_out_password");
1325
exitstatus = EX_IOERR;
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1326
1058
}
1327
1059
}
1328
1060
1329
1061
/* Restore old signal handler */
1330
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1331
1063
if(ret == -1){
1332
error(0, errno, "sigaction");
1333
exitstatus = EX_OSERR;
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1334
1066
}
1335
1067
1336
1068
if(custom_argv != NULL){
1337
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1338
1070
free(*arg);
1340
1072
free(custom_argv);
1341
1073
}
1342
1074
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1075
if(dir != NULL){
1076
closedir(dir);
1347
1077
}
1348
1078
1349
/* Kill the processes */
1079
/* Free the process list and kill the processes */
1350
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1351
1081
if(p->pid != 0){
1352
1082
close(p->fd);
1353
1083
ret = kill(p->pid, SIGTERM);
1354
1084
if(ret == -1 and errno != ESRCH){
1355
1085
/* Set-uid proccesses might not get closed */
1356
error(0, errno, "kill");
1086
perror("kill");
1357
1087
}
1358
1088
}
1359
1089
}
1360
1090
1361
1091
/* Wait for any remaining child processes to terminate */
1362
do {
1092
do{
1363
1093
ret = wait(NULL);
1364
1094
} while(ret >= 0);
1365
1095
if(errno != ECHILD){
1366
error(0, errno, "wait");
1096
perror("wait");
1367
1097
}
1368
1098
1369
1099
free_plugin_list();
1370
1100
1371
1101
free(plugindir);
1372
free(pluginhelperdir);
1373
1102
free(argfile);
1374
1103
1375
1104
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0