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- Committer: teddy at recompile
- Date: 2020-11-30 16:25:32 UTC
- Revision ID: teddy@recompile.se-20201130162532-b73s2tsihw3so6pw
Update Debian Policy version to 4.5.1; no other changes necessary.
* debian/control (Standards-Version): Change to "4.5.1".
* debian/control (Standards-Version): Change to "4.5.1".
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 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
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
29
31
#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() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#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() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
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;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
97
105
static plugin *plugin_list = NULL;
98
106
99
/* Gets a existing plugin based on name,
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
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))){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
106
115
return p;
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
144
169
145
170
/* Append the new plugin to the list */
146
171
plugin_list = new_plugin;
147
172
return new_plugin;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
156
196
/* Malloc check */
157
if(*array == NULL){
197
if(new_array == NULL){
158
198
return false;
159
199
}
200
*array = new_array;
160
201
/* Make a copy of the new string */
161
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
162
206
if(copy == NULL){
163
207
return false;
164
208
}
171
215
}
172
216
173
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
174
219
static bool add_argument(plugin *p, const char *arg){
175
220
if(p == NULL){
176
221
return false;
179
224
}
180
225
181
226
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
227
__attribute__((nonnull(2), warn_unused_result))
228
static bool add_environment(plugin *p, const char *def, bool replace){
183
229
if(p == NULL){
184
230
return false;
185
231
}
232
/* namelen = length of name of environment variable */
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
237
/* It already exists */
238
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
244
return false;
245
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
248
}
249
return true;
250
}
251
}
186
252
return add_to_char_array(def, &(p->environ), &(p->envc));
187
253
}
188
254
255
#ifndef O_CLOEXEC
189
256
/*
190
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
191
258
* Descriptor Flags".
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
193
260
*/
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
197
264
/* If reading the flags failed, return error indication now. */
198
265
if(ret < 0){
199
266
return ret;
200
267
}
201
268
/* Store modified flag word in the descriptor. */
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
203
271
}
272
#endif /* not O_CLOEXEC */
204
273
205
274
206
275
/* Mark processes as completed when they exit, and save their exit
207
276
status. */
208
void handle_sigchld(__attribute__((unused)) int sig){
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
209
279
while(true){
210
280
plugin *proc = plugin_list;
211
281
int status;
215
285
break;
216
286
}
217
287
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
220
291
}
221
/* No child processes */
222
break;
292
error(0, errno, "waitpid");
223
293
}
224
294
225
295
/* A child exited, find it in process_list */
226
296
while(proc != NULL and proc->pid != pid){
227
297
proc = proc->next;
231
301
continue;
232
302
}
233
303
proc->status = status;
234
proc->completed = true;
304
proc->completed = 1;
235
305
}
306
errno = old_errno;
236
307
}
237
308
238
309
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
240
312
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
313
for(size_t written = 0; written < length; written += (size_t)ret){
245
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
315
length - written));
252
321
}
253
322
254
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
255
325
static void free_plugin(plugin *plugin_node){
256
326
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
258
328
free(*arg);
259
329
}
330
free(plugin_node->name);
260
331
free(plugin_node->argv);
261
332
for(char **env = plugin_node->environ; *env != NULL; env++){
262
333
free(*env);
263
334
}
264
335
free(plugin_node->environ);
265
336
free(plugin_node->buffer);
266
337
267
338
/* Removes the plugin from the singly-linked list */
268
339
if(plugin_node == plugin_list){
269
340
/* First one - simple */
289
360
290
361
int main(int argc, char *argv[]){
291
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
292
364
char *argfile = NULL;
293
365
FILE *conffp;
294
size_t d_name_len;
295
DIR *dir = NULL;
296
struct dirent *dirst;
366
struct dirent **direntries = NULL;
297
367
struct stat st;
298
368
fd_set rfds_all;
299
369
int ret, maxfd = 0;
370
ssize_t sret;
300
371
uid_t uid = 65534;
301
372
gid_t gid = 65534;
302
373
bool debug = false;
306
377
.sa_flags = SA_NOCLDSTOP };
307
378
char **custom_argv = NULL;
308
379
int custom_argc = 0;
380
int dir_fd = -1;
309
381
310
382
/* Establish a signal handler */
311
383
sigemptyset(&sigchld_action.sa_mask);
312
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
385
if(ret == -1){
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
316
388
goto fallback;
317
389
}
318
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
391
if(ret == -1){
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
322
394
goto fallback;
323
395
}
324
396
327
399
{ .name = "global-options", .key = 'g',
328
400
.arg = "OPTION[,OPTION[,...]]",
329
401
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
402
{ .name = "global-env", .key = 'G',
331
403
.arg = "VAR=value",
332
404
.doc = "Environment variable passed to all plugins" },
333
405
{ .name = "options-for", .key = 'o',
334
406
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
407
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
408
{ .name = "env-for", .key = 'E',
337
409
.arg = "PLUGIN:ENV=value",
338
410
.doc = "Environment variable passed to specified plugin" },
339
411
{ .name = "disable", .key = 'd',
340
412
.arg = "PLUGIN",
341
413
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
342
417
{ .name = "plugin-dir", .key = 128,
343
418
.arg = "DIRECTORY",
344
419
.doc = "Specify a different plugin directory", .group = 2 },
353
428
.doc = "Group ID the plugins will run as", .group = 3 },
354
429
{ .name = "debug", .key = 132,
355
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
356
444
{ .name = NULL }
357
445
};
358
446
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
363
switch (key) {
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
364
453
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
454
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
390
467
}
391
468
break;
392
469
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
412
488
}
413
489
}
490
errno = 0;
414
491
}
415
492
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
493
case 'E': /* --env-for */
420
494
{
421
495
char *envdef = strchr(arg, ':');
422
496
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
429
502
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
432
510
}
433
511
}
434
512
break;
435
513
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
442
529
}
443
530
break;
444
531
case 128: /* --plugin-dir */
532
free(plugindir);
445
533
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
case 129: /* --config-file */
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
break;
538
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
541
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
break;
552
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
break;
563
case 132: /* --debug */
564
debug = true;
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
451
628
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
454
631
}
455
break;
632
break;
456
633
case 130: /* --userid */
457
uid = (uid_t)strtol(arg, NULL, 10);
458
break;
459
634
case 131: /* --groupid */
460
gid = (gid_t)strtol(arg, NULL, 10);
461
break;
462
635
case 132: /* --debug */
463
debug = true;
464
break;
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
465
640
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
break;
468
case ARGP_KEY_END:
469
641
break;
470
642
default:
471
643
return ARGP_ERR_UNKNOWN;
472
644
}
473
return 0;
645
return errno;
474
646
}
475
647
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
478
651
.doc = "Mandos plugin runner -- Run plugins" };
479
652
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
exitstatus = EXIT_FAILURE;
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
484
669
goto fallback;
485
670
}
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
/* Open the configfile if available */
676
if(argfile == NULL){
489
677
conffp = fopen(AFILE, "r");
490
678
} else {
491
679
conffp = fopen(argfile, "r");
492
}
680
}
493
681
if(conffp != NULL){
494
682
char *org_line = NULL;
495
683
char *p, *arg, *new_arg, *line;
496
684
size_t size = 0;
497
ssize_t sret;
498
685
const char whitespace_delims[] = " \r\t\f\v\n";
499
686
const char comment_delim[] = "#";
500
687
501
688
custom_argc = 1;
502
689
custom_argv = malloc(sizeof(char*) * 2);
503
690
if(custom_argv == NULL){
504
perror("malloc");
505
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
506
693
goto fallback;
507
694
}
508
695
custom_argv[0] = argv[0];
509
696
custom_argv[1] = NULL;
510
697
511
698
/* for each line in the config file, strip whitespace and ignore
512
699
commented text */
513
700
while(true){
515
702
if(sret == -1){
516
703
break;
517
704
}
518
705
519
706
line = org_line;
520
707
arg = strsep(&line, comment_delim);
521
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
524
711
}
525
712
new_arg = strdup(p);
526
713
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
529
716
free(org_line);
530
717
goto fallback;
531
718
}
532
719
533
720
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
541
744
}
542
745
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
544
747
}
545
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
546
757
free(org_line);
547
} else{
758
} else {
548
759
/* Check for harmful errors and go to fallback. Other errors might
549
760
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
553
764
goto fallback;
554
765
}
555
766
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
558
769
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
784
goto fallback;
785
}
786
}
787
788
/* Parse actual command line arguments, to let them override the
789
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
564
822
}
565
823
}
566
824
567
825
if(debug){
568
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
569
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
570
828
p->name ? p->name : "Global", p->argc - 1);
571
829
for(char **a = p->argv; *a != NULL; a++){
572
830
fprintf(stderr, "\tArg: %s\n", *a);
573
831
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
575
833
for(char **a = p->environ; *a != NULL; a++){
576
834
fprintf(stderr, "\t%s\n", *a);
577
835
}
578
836
}
579
837
}
580
581
/* Strip permissions down to nobody */
838
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
582
868
ret = setuid(uid);
583
if (ret == -1){
584
perror("setuid");
585
}
586
setgid(gid);
587
if (ret == -1){
588
perror("setgid");
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
597
if(dir == NULL){
598
perror("Could not open plugin dir");
599
exitstatus = EXIT_FAILURE;
600
goto fallback;
601
}
602
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
604
874
{
605
int dir_fd = dirfd(dir);
606
if(dir_fd >= 0){
607
ret = set_cloexec_flag(dir_fd);
608
if(ret < 0){
609
perror("set_cloexec_flag");
610
exitstatus = EXIT_FAILURE;
611
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
612
919
}
613
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
614
931
}
615
932
616
933
FD_ZERO(&rfds_all);
617
934
618
935
/* Read and execute any executable in the plugin directory*/
619
while(true){
620
dirst = readdir(dir);
621
622
// All directory entries have been processed
623
if(dirst == NULL){
624
if (errno == EBADF){
625
perror("readdir");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
629
break;
630
}
631
632
d_name_len = strlen(dirst->d_name);
633
634
// Ignore dotfiles, backup files and other junk
635
{
636
bool bad_name = false;
637
638
const char const *bad_prefixes[] = { ".", "#", NULL };
639
640
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
641
".dpkg-old",
642
".dpkg-divert", NULL };
643
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
644
size_t pre_len = strlen(*pre);
645
if((d_name_len >= pre_len)
646
and strncmp((dirst->d_name), *pre, pre_len) == 0){
647
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad prefix %s\n", dirst->d_name, *pre);
650
}
651
bad_name = true;
652
break;
653
}
654
}
655
if(bad_name){
656
continue;
657
}
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
size_t suf_len = strlen(*suf);
660
if((d_name_len >= suf_len)
661
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
662
== 0)){
663
if(debug){
664
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
665
" with bad suffix %s\n", dirst->d_name, *suf);
666
}
667
bad_name = true;
668
break;
669
}
670
}
671
672
if(bad_name){
673
continue;
674
}
675
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
682
}
683
684
ret = stat(filename, &st);
685
if (ret == -1){
686
perror("stat");
687
free(filename);
688
continue;
689
}
690
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
691
952
/* Ignore non-executable files */
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
693
956
if(debug){
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
695
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
696
961
}
697
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
698
964
continue;
699
965
}
700
966
701
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
702
968
if(p == NULL){
703
perror("getplugin");
704
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
705
972
continue;
706
973
}
707
974
if(p->disabled){
708
975
if(debug){
709
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
710
dirst->d_name);
977
direntries[i]->d_name);
711
978
}
712
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
713
981
continue;
714
982
}
715
983
{
718
986
if(g != NULL){
719
987
for(char **a = g->argv + 1; *a != NULL; a++){
720
988
if(not add_argument(p, *a)){
721
perror("add_argument");
989
error(0, errno, "add_argument");
722
990
}
723
991
}
724
992
/* Add global environment variables */
725
993
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
994
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
728
996
}
729
997
}
730
998
}
731
999
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
735
1002
if(p->environ[0] != NULL){
736
1003
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
1004
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
744
1006
}
745
1007
}
746
1008
}
747
1009
748
1010
int pipefd[2];
749
ret = pipe(pipefd);
750
if (ret == -1){
751
perror("pipe");
752
exitstatus = EXIT_FAILURE;
753
goto fallback;
754
}
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
755
1032
/* Ask OS to automatic close the pipe on exec */
756
1033
ret = set_cloexec_flag(pipefd[0]);
757
1034
if(ret < 0){
758
perror("set_cloexec_flag");
759
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
760
1040
goto fallback;
761
1041
}
762
1042
ret = set_cloexec_flag(pipefd[1]);
763
1043
if(ret < 0){
764
perror("set_cloexec_flag");
765
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
766
1049
goto fallback;
767
1050
}
1051
#endif /* not O_CLOEXEC */
768
1052
/* Block SIGCHLD until process is safely in process list */
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
770
1056
if(ret < 0){
771
perror("sigprocmask");
772
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
773
1060
goto fallback;
774
1061
}
775
// Starting a new process to be watched
776
pid_t pid = fork();
1062
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
777
1067
if(pid == -1){
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
780
1075
goto fallback;
781
1076
}
782
1077
if(pid == 0){
783
1078
/* this is the child process */
784
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
785
1080
if(ret < 0){
786
perror("sigaction");
787
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
788
1083
}
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
790
1085
if(ret < 0){
791
perror("sigprocmask");
792
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
793
1088
}
794
1089
795
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
796
1091
if(ret == -1){
797
perror("dup2");
798
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
799
1094
}
800
1095
801
if(dirfd(dir) < 0){
802
/* If dir has no file descriptor, we could not set FD_CLOEXEC
803
above and must now close it manually here. */
804
closedir(dir);
805
}
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
816
1102
}
817
1103
/* no return */
818
1104
}
819
1105
/* Parent process */
820
1106
close(pipefd[1]); /* Close unused write end of pipe */
821
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
826
1114
if(ret < 0){
827
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
828
1116
}
829
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
830
1119
goto fallback;
831
1120
}
1121
free(direntries[i]);
832
1122
833
1123
new_plugin->pid = pid;
834
1124
new_plugin->fd = pipefd[0];
835
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
836
1131
/* Unblock SIGCHLD so signal handler can be run if this process
837
1132
has already completed */
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
839
1136
if(ret < 0){
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
842
1139
goto fallback;
843
1140
}
844
1141
845
1142
FD_SET(new_plugin->fd, &rfds_all);
846
1143
847
if (maxfd < new_plugin->fd){
1144
if(maxfd < new_plugin->fd){
848
1145
maxfd = new_plugin->fd;
849
1146
}
850
851
1147
}
852
1148
853
closedir(dir);
854
dir = NULL;
855
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
856
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
1156
if(p->pid != 0){
858
1157
break;
863
1162
free_plugin_list();
864
1163
}
865
1164
}
866
1165
867
1166
/* Main loop while running plugins exist */
868
1167
while(plugin_list){
869
1168
fd_set rfds = rfds_all;
870
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
871
if (select_ret == -1){
872
perror("select");
873
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
874
1173
goto fallback;
875
1174
}
876
1175
/* OK, now either a process completed, or something can be read
877
1176
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
879
1178
/* Is this process completely done? */
880
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
881
1180
/* Only accept the plugin output if it exited cleanly */
882
1181
if(not WIFEXITED(proc->status)
883
1182
or WEXITSTATUS(proc->status) != 0){
884
1183
/* Bad exit by plugin */
885
1184
886
1185
if(debug){
887
1186
if(WIFEXITED(proc->status)){
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
890
1190
WEXITSTATUS(proc->status));
891
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
895
} else if(WCOREDUMP(proc->status)){
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
898
1197
}
899
1198
}
900
1199
901
1200
/* Remove the plugin */
902
1201
FD_CLR(proc->fd, &rfds_all);
903
1202
904
1203
/* Block signal while modifying process_list */
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
906
1208
if(ret < 0){
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
909
1211
goto fallback;
910
1212
}
1213
1214
plugin *next_plugin = proc->next;
911
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
912
1218
/* We are done modifying process list, so unblock signal */
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
915
1222
if(ret < 0){
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
918
1225
goto fallback;
919
1226
}
920
1227
921
1228
if(plugin_list == NULL){
922
1229
break;
923
1230
}
1231
924
1232
continue;
925
1233
}
926
1234
927
1235
/* This process exited nicely, so print its buffer */
928
1236
929
1237
bool bret = print_out_password(proc->buffer,
930
1238
proc->buffer_length);
931
1239
if(not bret){
932
perror("print_out_password");
933
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
934
1242
}
935
1243
goto fallback;
936
1244
}
938
1246
/* This process has not completed. Does it have any output? */
939
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
941
1250
continue;
942
1251
}
943
1252
/* Before reading, make the process' data buffer large enough */
944
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
945
proc->buffer = realloc(proc->buffer, proc->buffer_size
946
+ (size_t) BUFFER_SIZE);
947
if (proc->buffer == NULL){
948
perror("malloc");
949
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
950
1259
goto fallback;
951
1260
}
1261
proc->buffer = new_buffer;
952
1262
proc->buffer_size += BUFFER_SIZE;
953
1263
}
954
1264
/* Read from the process */
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
956
BUFFER_SIZE);
957
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
958
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
959
1272
continue;
960
1273
}
961
if(ret == 0){
1274
if(sret == 0){
962
1275
/* got EOF */
963
1276
proc->eof = true;
964
1277
} else {
965
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
966
1279
}
967
1280
}
968
1281
}
969
970
1282
1283
971
1284
fallback:
972
1285
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
974
1288
/* Fallback if all plugins failed, none are found or an error
975
1289
occured */
976
1290
bool bret;
977
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
1292
char *passwordbuffer = getpass("Password: ");
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
980
1300
if(not bret){
981
perror("print_out_password");
982
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
983
1303
}
984
1304
}
985
1305
986
1306
/* Restore old signal handler */
987
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
1308
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
991
1311
}
992
1312
993
1313
if(custom_argv != NULL){
994
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
1315
free(*arg);
997
1317
free(custom_argv);
998
1318
}
999
1319
1000
if(dir != NULL){
1001
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1002
1324
}
1003
1325
1004
/* Free the process list and kill the processes */
1326
/* Kill the processes */
1005
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
1328
if(p->pid != 0){
1007
1329
close(p->fd);
1008
1330
ret = kill(p->pid, SIGTERM);
1009
1331
if(ret == -1 and errno != ESRCH){
1010
1332
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1333
error(0, errno, "kill");
1012
1334
}
1013
1335
}
1014
1336
}
1015
1337
1016
1338
/* Wait for any remaining child processes to terminate */
1017
do{
1339
do {
1018
1340
ret = wait(NULL);
1019
1341
} while(ret >= 0);
1020
1342
if(errno != ECHILD){
1021
perror("wait");
1343
error(0, errno, "wait");
1022
1344
}
1023
1345
1024
1346
free_plugin_list();
1025
1347
1026
1348
free(plugindir);
1349
free(pluginhelperdir);
1027
1350
free(argfile);
1028
1351
1029
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0