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- Committer: Teddy Hogeborn
- Date: 2009-01-12 22:02:33 UTC
- Revision ID: teddy@fukt.bsnet.se-20090112220233-lawxo4uvyzb38u1f
* README (The Plugin System): Removed redundant text about options and
files for the plugins, this is now
documented in the manuals for the
plugins.
* plugins.d/mandos-client.c (main): Remove comment which was copied
from another program by mistake.
Use "sscanf" instead of "strtol"
to parse numbers; this uses the
correct type instead of casting.
Don't report errors when removing
temporary directory if directory
is already gone.
files for the plugins, this is now
documented in the manuals for the
plugins.
* plugins.d/mandos-client.c (main): Remove comment which was copied
from another program by mistake.
Use "sscanf" instead of "strtol"
to parse numbers; this uses the
correct type instead of casting.
Don't report errors when removing
temporary directory if directory
is already gone.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-ctl => mandos-list
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
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() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
42
27
#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() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
63
53
#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 */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
#include <errno.h> /* errno, EBADF */
89
67
90
68
#define BUFFER_SIZE 256
91
69
92
70
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
72
96
73
const char *argp_program_version = "plugin-runner " VERSION;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
98
75
99
76
typedef struct plugin{
100
77
char *name; /* can be NULL or any plugin name */
103
80
char **environ;
104
81
int envc;
105
82
bool disabled;
106
83
107
84
/* Variables used for running processes*/
108
85
pid_t pid;
109
86
int fd;
111
88
size_t buffer_size;
112
89
size_t buffer_length;
113
90
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
91
volatile bool completed;
92
volatile int status;
116
93
struct plugin *next;
117
94
} plugin;
118
95
120
97
121
98
/* Gets an existing plugin based on name,
122
99
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
100
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))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
129
105
return p;
130
106
}
131
107
}
132
108
/* 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){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
138
111
return NULL;
139
112
}
140
113
char *copy_name = NULL;
141
114
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
145
116
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
117
return NULL;
150
118
}
151
119
}
152
120
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
157
125
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;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
163
128
free(copy_name);
164
129
free(new_plugin);
165
errno = e;
166
130
return NULL;
167
131
}
168
132
new_plugin->argv[0] = copy_name;
169
133
new_plugin->argv[1] = NULL;
170
134
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
174
136
if(new_plugin->environ == NULL){
175
int e = errno;
176
137
free(copy_name);
177
138
free(new_plugin->argv);
178
139
free(new_plugin);
179
errno = e;
180
140
return NULL;
181
141
}
182
142
new_plugin->environ[0] = NULL;
187
147
}
188
148
189
149
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
150
static bool add_to_char_array(const char *new, char ***array,
192
151
int *len){
193
152
/* 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);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
210
155
/* Malloc check */
211
if(new_array == NULL){
156
if(*array == NULL){
212
157
return false;
213
158
}
214
*array = new_array;
215
159
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
220
161
if(copy == NULL){
221
162
return false;
222
163
}
229
170
}
230
171
231
172
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
173
static bool add_argument(plugin *p, const char *arg){
234
174
if(p == NULL){
235
175
return false;
238
178
}
239
179
240
180
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
181
static bool add_environment(plugin *p, const char *def, bool replace){
243
182
if(p == NULL){
244
183
return false;
246
185
/* namelen = length of name of environment variable */
247
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
187
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
251
190
/* It already exists */
252
191
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){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
258
194
return false;
259
195
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
262
198
}
263
199
return true;
264
200
}
266
202
return add_to_char_array(def, &(p->environ), &(p->envc));
267
203
}
268
204
269
#ifndef O_CLOEXEC
270
205
/*
271
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
207
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
209
*/
275
__attribute__((warn_unused_result))
276
210
static int set_cloexec_flag(int fd){
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
278
212
/* If reading the flags failed, return error indication now. */
279
213
if(ret < 0){
280
214
return ret;
281
215
}
282
216
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
218
}
286
#endif /* not O_CLOEXEC */
287
219
288
220
289
221
/* Mark processes as completed when they exit, and save their exit
290
222
status. */
291
223
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
293
224
while(true){
294
225
plugin *proc = plugin_list;
295
226
int status;
299
230
break;
300
231
}
301
232
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
233
if (errno != ECHILD){
234
perror("waitpid");
305
235
}
306
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
307
238
}
308
239
309
240
/* A child exited, find it in process_list */
315
246
continue;
316
247
}
317
248
proc->status = status;
318
proc->completed = 1;
249
proc->completed = true;
319
250
}
320
errno = old_errno;
321
251
}
322
252
323
253
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
254
static bool print_out_password(const char *buffer, size_t length){
326
255
ssize_t ret;
327
256
for(size_t written = 0; written < length; written += (size_t)ret){
335
264
}
336
265
337
266
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
267
static void free_plugin(plugin *plugin_node){
340
268
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
270
free(*arg);
343
271
}
344
free(plugin_node->name);
345
272
free(plugin_node->argv);
346
273
for(char **env = plugin_node->environ; *env != NULL; env++){
347
274
free(*env);
348
275
}
349
276
free(plugin_node->environ);
350
277
free(plugin_node->buffer);
351
278
352
279
/* Removes the plugin from the singly-linked list */
353
280
if(plugin_node == plugin_list){
354
281
/* First one - simple */
374
301
375
302
int main(int argc, char *argv[]){
376
303
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
304
char *argfile = NULL;
379
305
FILE *conffp;
380
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
381
309
struct stat st;
382
310
fd_set rfds_all;
383
311
int ret, maxfd = 0;
391
319
.sa_flags = SA_NOCLDSTOP };
392
320
char **custom_argv = NULL;
393
321
int custom_argc = 0;
394
int dir_fd = -1;
395
322
396
323
/* Establish a signal handler */
397
324
sigemptyset(&sigchld_action.sa_mask);
398
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
326
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
402
329
goto fallback;
403
330
}
404
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
332
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
408
335
goto fallback;
409
336
}
410
337
442
369
.doc = "Group ID the plugins will run as", .group = 3 },
443
370
{ .name = "debug", .key = 132,
444
371
.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
372
{ .name = NULL }
459
373
};
460
374
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;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
467
378
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;
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
473
388
}
474
389
}
475
errno = 0;
476
390
}
477
391
break;
478
392
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
481
398
}
482
399
break;
483
400
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;
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
505
420
}
506
421
break;
507
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
508
426
{
509
427
char *envdef = strchr(arg, ':');
510
428
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
429
break;
514
430
}
515
431
*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;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
524
434
}
525
435
}
526
436
break;
527
437
case 'd': /* --disable */
528
{
438
if (arg != NULL){
529
439
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
533
442
}
443
p->disabled = true;
534
444
}
535
445
break;
536
446
case 'e': /* --enable */
537
{
447
if (arg != NULL){
538
448
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
542
451
}
452
p->disabled = false;
543
453
}
544
454
break;
545
455
case 128: /* --plugin-dir */
546
456
free(plugindir);
547
457
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
458
if(plugindir == NULL){
459
perror("strdup");
460
}
551
461
break;
552
462
case 129: /* --config-file */
553
463
/* This is already done by parse_opt_config_file() */
554
464
break;
555
465
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;
466
uid = (uid_t)strtol(arg, NULL, 10);
565
467
break;
566
468
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;
469
gid = (gid_t)strtol(arg, NULL, 10);
576
470
break;
577
471
case 132: /* --debug */
578
472
debug = true;
579
473
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
474
case ARGP_KEY_ARG:
608
475
/* Cryptsetup always passes an argument, which is an empty
609
476
string if "none" was specified in /etc/crypttab. So if
610
477
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
613
480
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
481
break;
482
case ARGP_KEY_END:
483
break;
619
484
default:
620
485
return ARGP_ERR_UNKNOWN;
621
486
}
622
return errno; /* Set to 0 at start */
487
return 0;
623
488
}
624
489
625
490
/* This option parser is the same as parse_opt() above, except it
626
491
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){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
632
496
case 'g': /* --global-options */
633
497
case 'G': /* --global-env */
634
498
case 'o': /* --options-for */
640
504
case 129: /* --config-file */
641
505
free(argfile);
642
506
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
507
if(argfile == NULL){
508
perror("strdup");
645
509
}
646
break;
510
break;
647
511
case 130: /* --userid */
648
512
case 131: /* --groupid */
649
513
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
655
516
break;
656
517
default:
657
518
return ARGP_ERR_UNKNOWN;
658
519
}
659
return errno;
520
return 0;
660
521
}
661
522
662
523
struct argp argp = { .options = options,
664
525
.args_doc = "",
665
526
.doc = "Mandos plugin runner -- Run plugins" };
666
527
667
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
668
529
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;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
683
534
goto fallback;
684
535
}
685
536
687
538
argp.parser = parse_opt;
688
539
689
540
/* Open the configfile if available */
690
if(argfile == NULL){
541
if (argfile == NULL){
691
542
conffp = fopen(AFILE, "r");
692
543
} else {
693
544
conffp = fopen(argfile, "r");
694
}
545
}
695
546
if(conffp != NULL){
696
547
char *org_line = NULL;
697
548
char *p, *arg, *new_arg, *line;
698
549
size_t size = 0;
699
550
const char whitespace_delims[] = " \r\t\f\v\n";
700
551
const char comment_delim[] = "#";
701
552
702
553
custom_argc = 1;
703
554
custom_argv = malloc(sizeof(char*) * 2);
704
555
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
707
558
goto fallback;
708
559
}
709
560
custom_argv[0] = argv[0];
710
561
custom_argv[1] = NULL;
711
562
712
563
/* for each line in the config file, strip whitespace and ignore
713
564
commented text */
714
565
while(true){
716
567
if(sret == -1){
717
568
break;
718
569
}
719
570
720
571
line = org_line;
721
572
arg = strsep(&line, comment_delim);
722
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
725
576
}
726
577
new_arg = strdup(p);
727
578
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
730
581
free(org_line);
731
582
goto fallback;
732
583
}
733
584
734
585
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
759
593
}
760
594
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
762
596
}
763
597
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
772
598
free(org_line);
773
599
} else {
774
600
/* Check for harmful errors and go to fallback. Other errors might
775
601
not affect opening plugins */
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
779
605
goto fallback;
780
606
}
781
607
}
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
784
610
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
799
616
goto fallback;
800
617
}
801
618
}
802
619
803
620
/* Parse actual command line arguments, to let them override the
804
621
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
838
627
}
839
628
840
629
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
632
p->name ? p->name : "Global", p->argc - 1);
844
633
for(char **a = p->argv; *a != NULL; a++){
845
634
fprintf(stderr, "\tArg: %s\n", *a);
846
635
}
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
848
637
for(char **a = p->environ; *a != NULL; a++){
849
638
fprintf(stderr, "\t%s\n", *a);
850
639
}
851
640
}
852
641
}
853
642
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
643
/* Strip permissions down to nobody */
892
644
ret = setuid(uid);
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
898
666
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
943
674
}
944
675
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
676
}
956
677
957
678
FD_ZERO(&rfds_all);
958
679
959
680
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
976
758
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
980
760
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
985
763
}
986
close(plugin_fd);
987
free(direntries[i]);
764
free(filename);
988
765
continue;
989
766
}
990
767
991
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
992
769
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
996
772
continue;
997
773
}
998
774
if(p->disabled){
999
775
if(debug){
1000
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
777
dirst->d_name);
1002
778
}
1003
close(plugin_fd);
1004
free(direntries[i]);
779
free(filename);
1005
780
continue;
1006
781
}
1007
782
{
1010
785
if(g != NULL){
1011
786
for(char **a = g->argv + 1; *a != NULL; a++){
1012
787
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
788
perror("add_argument");
1014
789
}
1015
790
}
1016
791
/* Add global environment variables */
1017
792
for(char **e = g->environ; *e != NULL; e++){
1018
793
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
794
perror("add_environment");
1020
795
}
1021
796
}
1022
797
}
1023
798
}
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
1026
802
if(p->environ[0] != NULL){
1027
803
for(char **e = environ; *e != NULL; e++){
1028
804
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
805
perror("add_environment");
1030
806
}
1031
807
}
1032
808
}
1033
809
1034
810
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1056
817
/* Ask OS to automatic close the pipe on exec */
1057
818
ret = set_cloexec_flag(pipefd[0]);
1058
819
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1064
822
goto fallback;
1065
823
}
1066
824
ret = set_cloexec_flag(pipefd[1]);
1067
825
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1073
828
goto fallback;
1074
829
}
1075
#endif /* not O_CLOEXEC */
1076
830
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1080
832
if(ret < 0){
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1084
835
goto fallback;
1085
836
}
1086
837
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1091
839
if(pid == -1){
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1099
842
goto fallback;
1100
843
}
1101
844
if(pid == 0){
1102
845
/* this is the child process */
1103
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
847
if(ret < 0){
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1107
850
}
1108
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
852
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1112
855
}
1113
856
1114
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
858
if(ret == -1){
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1118
861
}
1119
862
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1126
878
}
1127
879
/* no return */
1128
880
}
1129
881
/* Parent process */
1130
882
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1138
888
if(ret < 0){
1139
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1140
890
}
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1143
892
goto fallback;
1144
893
}
1145
free(direntries[i]);
1146
894
1147
895
new_plugin->pid = pid;
1148
896
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
897
1155
898
/* Unblock SIGCHLD so signal handler can be run if this process
1156
899
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1160
901
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1163
904
goto fallback;
1164
905
}
1165
906
1166
907
FD_SET(new_plugin->fd, &rfds_all);
1167
908
1168
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1169
910
maxfd = new_plugin->fd;
1170
911
}
1171
912
}
1172
913
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1178
916
1179
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
918
if(p->pid != 0){
1191
929
while(plugin_list){
1192
930
fd_set rfds = rfds_all;
1193
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1197
935
goto fallback;
1198
936
}
1199
937
/* OK, now either a process completed, or something can be read
1200
938
from one of them */
1201
939
for(plugin *proc = plugin_list; proc != NULL;){
1202
940
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1204
942
/* Only accept the plugin output if it exited cleanly */
1205
943
if(not WIFEXITED(proc->status)
1206
944
or WEXITSTATUS(proc->status) != 0){
1207
945
/* Bad exit by plugin */
1208
946
1209
947
if(debug){
1210
948
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1214
951
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1221
959
}
1222
960
}
1223
961
1224
962
/* Remove the plugin */
1225
963
FD_CLR(proc->fd, &rfds_all);
1226
964
1227
965
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1232
967
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1235
970
goto fallback;
1236
971
}
1237
972
1240
975
proc = next_plugin;
1241
976
1242
977
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1246
980
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1249
983
goto fallback;
1250
984
}
1251
985
1261
995
bool bret = print_out_password(proc->buffer,
1262
996
proc->buffer_length);
1263
997
if(not bret){
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1266
1000
}
1267
1001
goto fallback;
1268
1002
}
1275
1009
}
1276
1010
/* Before reading, make the process' data buffer large enough */
1277
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
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;
1283
1017
goto fallback;
1284
1018
}
1285
proc->buffer = new_buffer;
1286
1019
proc->buffer_size += BUFFER_SIZE;
1287
1020
}
1288
1021
/* Read from the process */
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1293
1024
if(sret < 0){
1294
1025
/* Read error from this process; ignore the error */
1295
1026
proc = proc->next;
1303
1034
}
1304
1035
}
1305
1036
}
1306
1307
1037
1038
1308
1039
fallback:
1309
1040
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1312
1042
/* Fallback if all plugins failed, none are found or an error
1313
1043
occured */
1314
1044
bool bret;
1322
1052
}
1323
1053
bret = print_out_password(passwordbuffer, len);
1324
1054
if(not bret){
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1327
1057
}
1328
1058
}
1329
1059
1330
1060
/* Restore old signal handler */
1331
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
1062
if(ret == -1){
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1335
1065
}
1336
1066
1337
1067
if(custom_argv != NULL){
1341
1071
free(custom_argv);
1342
1072
}
1343
1073
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1348
1076
}
1349
1077
1350
1078
/* Kill the processes */
1354
1082
ret = kill(p->pid, SIGTERM);
1355
1083
if(ret == -1 and errno != ESRCH){
1356
1084
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1085
perror("kill");
1358
1086
}
1359
1087
}
1360
1088
}
1361
1089
1362
1090
/* Wait for any remaining child processes to terminate */
1363
do {
1091
do{
1364
1092
ret = wait(NULL);
1365
1093
} while(ret >= 0);
1366
1094
if(errno != ECHILD){
1367
error(0, errno, "wait");
1095
perror("wait");
1368
1096
}
1369
1097
1370
1098
free_plugin_list();
1371
1099
1372
1100
free(plugindir);
1373
free(pluginhelperdir);
1374
1101
free(argfile);
1375
1102
1376
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0