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- Committer: teddy at recompile
- Date: 2020-04-08 19:15:13 UTC
- mfrom: (237.4.130 release)
- Revision ID: teddy@recompile.se-20200408191513-n0ke303478rw1g0b
Merge from release branch
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
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)) struct argp_state *state) {
360
/* Get the INPUT argument from `argp_parse', which we know is a
361
pointer to our plugin list pointer. */
362
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;
363
453
case 'g': /* --global-options */
364
if (arg != NULL){
365
char *p;
366
while((p = strsep(&arg, ",")) != NULL){
367
if(p[0] == '\0'){
368
continue;
369
}
370
if(not add_argument(getplugin(NULL), p)){
371
perror("add_argument");
372
return ARGP_ERR_UNKNOWN;
373
}
374
}
375
}
376
break;
377
case 'e': /* --global-envs */
378
if(arg == NULL){
379
break;
380
}
381
454
{
382
char *envdef = strdup(arg);
383
if(envdef == NULL){
384
break;
385
}
386
if(not add_environment(getplugin(NULL), envdef)){
387
perror("add_environment");
388
}
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;
389
467
}
390
468
break;
391
469
case 'o': /* --options-for */
392
if (arg != NULL){
393
char *p_name = strsep(&arg, ":");
394
if(p_name[0] == '\0'){
395
break;
396
}
397
char *opt = strsep(&arg, ":");
398
if(opt[0] == '\0'){
399
break;
400
}
401
if(opt != NULL){
402
char *p;
403
while((p = strsep(&opt, ",")) != NULL){
404
if(p[0] == '\0'){
405
continue;
406
}
407
if(not add_argument(getplugin(p_name), p)){
408
perror("add_argument");
409
return ARGP_ERR_UNKNOWN;
410
}
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;
411
488
}
412
489
}
490
errno = 0;
413
491
}
414
492
break;
415
case 'f': /* --envs-for */
416
if(arg == NULL){
417
break;
418
}
493
case 'E': /* --env-for */
419
494
{
420
495
char *envdef = strchr(arg, ':');
421
496
if(envdef == NULL){
422
break;
423
}
424
char *p_name = strndup(arg, (size_t) (envdef-arg));
425
if(p_name == NULL){
426
break;
427
}
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
428
502
envdef++;
429
if(not add_environment(getplugin(p_name), envdef)){
430
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;
431
510
}
432
511
}
433
512
break;
434
513
case 'd': /* --disable */
435
if (arg != NULL){
436
plugin *p = getplugin(arg);
437
if(p == NULL){
438
return ARGP_ERR_UNKNOWN;
439
}
440
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
}
441
529
}
442
530
break;
443
531
case 128: /* --plugin-dir */
532
free(plugindir);
444
533
plugindir = strdup(arg);
445
if(plugindir == NULL){
446
perror("strdup");
447
}
448
break;
449
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);
450
628
argfile = strdup(arg);
451
if(argfile == NULL){
452
perror("strdup");
629
if(argfile != NULL){
630
errno = 0;
453
631
}
454
break;
632
break;
455
633
case 130: /* --userid */
456
uid = (uid_t)strtol(arg, NULL, 10);
457
break;
458
634
case 131: /* --groupid */
459
gid = (gid_t)strtol(arg, NULL, 10);
460
break;
461
635
case 132: /* --debug */
462
debug = true;
463
break;
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
464
640
case ARGP_KEY_ARG:
465
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
466
break;
467
case ARGP_KEY_END:
468
641
break;
469
642
default:
470
643
return ARGP_ERR_UNKNOWN;
471
644
}
472
return 0;
645
return errno;
473
646
}
474
647
475
struct argp argp = { .options = options, .parser = parse_opt,
476
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
477
651
.doc = "Mandos plugin runner -- Run plugins" };
478
652
479
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
480
if (ret == ARGP_ERR_UNKNOWN){
481
fprintf(stderr, "Unknown error while parsing arguments\n");
482
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;
483
669
goto fallback;
484
670
}
485
486
/* Opens the configfile if aviable */
487
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){
488
677
conffp = fopen(AFILE, "r");
489
678
} else {
490
679
conffp = fopen(argfile, "r");
491
}
680
}
492
681
if(conffp != NULL){
493
682
char *org_line = NULL;
494
683
char *p, *arg, *new_arg, *line;
495
684
size_t size = 0;
496
ssize_t sret;
497
685
const char whitespace_delims[] = " \r\t\f\v\n";
498
686
const char comment_delim[] = "#";
499
687
500
688
custom_argc = 1;
501
689
custom_argv = malloc(sizeof(char*) * 2);
502
690
if(custom_argv == NULL){
503
perror("malloc");
504
exitstatus = EXIT_FAILURE;
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
505
693
goto fallback;
506
694
}
507
695
custom_argv[0] = argv[0];
508
696
custom_argv[1] = NULL;
509
510
/* for each line in the config file, strip whitespace and ignore commented text */
697
698
/* for each line in the config file, strip whitespace and ignore
699
commented text */
511
700
while(true){
512
701
sret = getline(&org_line, &size, conffp);
513
702
if(sret == -1){
514
703
break;
515
704
}
516
705
517
706
line = org_line;
518
707
arg = strsep(&line, comment_delim);
519
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
711
}
523
712
new_arg = strdup(p);
524
713
if(new_arg == NULL){
525
perror("strdup");
526
exitstatus = EXIT_FAILURE;
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
527
716
free(org_line);
528
717
goto fallback;
529
718
}
530
719
531
720
custom_argc += 1;
532
custom_argv = realloc(custom_argv, sizeof(char *)
533
* ((unsigned int) custom_argc + 1));
534
if(custom_argv == NULL){
535
perror("realloc");
536
exitstatus = EXIT_FAILURE;
537
free(org_line);
538
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
}
539
744
}
540
745
custom_argv[custom_argc-1] = new_arg;
541
custom_argv[custom_argc] = NULL;
746
custom_argv[custom_argc] = NULL;
542
747
}
543
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
}
544
757
free(org_line);
545
} else{
758
} else {
546
759
/* Check for harmful errors and go to fallback. Other errors might
547
760
not affect opening plugins */
548
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
549
perror("fopen");
550
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
551
764
goto fallback;
552
765
}
553
766
}
554
/* If there was any arguments from configuration file,
555
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 */
556
769
if(custom_argv != NULL){
557
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
558
if (ret == ARGP_ERR_UNKNOWN){
559
fprintf(stderr, "Unknown error while parsing arguments\n");
560
exitstatus = EXIT_FAILURE;
561
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);
562
822
}
563
823
}
564
824
565
825
if(debug){
566
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
567
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
568
828
p->name ? p->name : "Global", p->argc - 1);
569
829
for(char **a = p->argv; *a != NULL; a++){
570
830
fprintf(stderr, "\tArg: %s\n", *a);
571
831
}
572
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
573
833
for(char **a = p->environ; *a != NULL; a++){
574
834
fprintf(stderr, "\t%s\n", *a);
575
835
}
576
836
}
577
837
}
578
579
/* 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
}
580
868
ret = setuid(uid);
581
if (ret == -1){
582
perror("setuid");
583
}
584
setgid(gid);
585
if (ret == -1){
586
perror("setgid");
587
}
588
589
if (plugindir == NULL){
590
dir = opendir(PDIR);
591
} else {
592
dir = opendir(plugindir);
593
}
594
595
if(dir == NULL){
596
perror("Could not open plugin dir");
597
exitstatus = EXIT_FAILURE;
598
goto fallback;
599
}
600
601
/* 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 */
602
874
{
603
int dir_fd = dirfd(dir);
604
if(dir_fd >= 0){
605
ret = set_cloexec_flag(dir_fd);
606
if(ret < 0){
607
perror("set_cloexec_flag");
608
exitstatus = EXIT_FAILURE;
609
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;
610
919
}
611
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;
612
931
}
613
932
614
933
FD_ZERO(&rfds_all);
615
934
616
935
/* Read and execute any executable in the plugin directory*/
617
while(true){
618
dirst = readdir(dir);
619
620
// All directory entries have been processed
621
if(dirst == NULL){
622
if (errno == EBADF){
623
perror("readdir");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
break;
628
}
629
630
d_name_len = strlen(dirst->d_name);
631
632
// Ignore dotfiles, backup files and other junk
633
{
634
bool bad_name = false;
635
636
const char const *bad_prefixes[] = { ".", "#", NULL };
637
638
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
639
".dpkg-old",
640
".dpkg-divert", NULL };
641
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
642
size_t pre_len = strlen(*pre);
643
if((d_name_len >= pre_len)
644
and strncmp((dirst->d_name), *pre, pre_len) == 0){
645
if(debug){
646
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
" with bad prefix %s\n", dirst->d_name, *pre);
648
}
649
bad_name = true;
650
break;
651
}
652
}
653
if(bad_name){
654
continue;
655
}
656
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
657
size_t suf_len = strlen(*suf);
658
if((d_name_len >= suf_len)
659
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
660
== 0)){
661
if(debug){
662
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
663
" with bad suffix %s\n", dirst->d_name, *suf);
664
}
665
bad_name = true;
666
break;
667
}
668
}
669
670
if(bad_name){
671
continue;
672
}
673
}
674
675
char *filename;
676
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
677
if(ret < 0){
678
perror("asprintf");
679
continue;
680
}
681
682
ret = stat(filename, &st);
683
if (ret == -1){
684
perror("stat");
685
free(filename);
686
continue;
687
}
688
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
689
952
/* Ignore non-executable files */
690
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)){
691
956
if(debug){
692
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
693
" 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);
694
961
}
695
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
696
964
continue;
697
965
}
698
966
699
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
700
968
if(p == NULL){
701
perror("getplugin");
702
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
703
972
continue;
704
973
}
705
974
if(p->disabled){
706
975
if(debug){
707
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
708
dirst->d_name);
977
direntries[i]->d_name);
709
978
}
710
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
711
981
continue;
712
982
}
713
983
{
716
986
if(g != NULL){
717
987
for(char **a = g->argv + 1; *a != NULL; a++){
718
988
if(not add_argument(p, *a)){
719
perror("add_argument");
989
error(0, errno, "add_argument");
720
990
}
721
991
}
722
992
/* Add global environment variables */
723
993
for(char **e = g->environ; *e != NULL; e++){
724
if(not add_environment(p, *e)){
725
perror("add_environment");
994
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
726
996
}
727
997
}
728
998
}
729
999
}
730
/* If this plugin has any environment variables, we will call
731
using execve and need to duplicate the environment from this
732
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
733
1002
if(p->environ[0] != NULL){
734
1003
for(char **e = environ; *e != NULL; e++){
735
char *copy = strdup(*e);
736
if(copy == NULL){
737
perror("strdup");
738
continue;
739
}
740
if(not add_environment(p, copy)){
741
perror("add_environment");
1004
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
742
1006
}
743
1007
}
744
1008
}
745
1009
746
1010
int pipefd[2];
747
ret = pipe(pipefd);
748
if (ret == -1){
749
perror("pipe");
750
exitstatus = EXIT_FAILURE;
751
goto fallback;
752
}
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
753
1032
/* Ask OS to automatic close the pipe on exec */
754
1033
ret = set_cloexec_flag(pipefd[0]);
755
1034
if(ret < 0){
756
perror("set_cloexec_flag");
757
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]);
758
1040
goto fallback;
759
1041
}
760
1042
ret = set_cloexec_flag(pipefd[1]);
761
1043
if(ret < 0){
762
perror("set_cloexec_flag");
763
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]);
764
1049
goto fallback;
765
1050
}
1051
#endif /* not O_CLOEXEC */
766
1052
/* Block SIGCHLD until process is safely in process list */
767
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));
768
1056
if(ret < 0){
769
perror("sigprocmask");
770
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
771
1060
goto fallback;
772
1061
}
773
// Starting a new process to be watched
774
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);
775
1067
if(pid == -1){
776
perror("fork");
777
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]);
778
1075
goto fallback;
779
1076
}
780
1077
if(pid == 0){
781
1078
/* this is the child process */
782
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
783
1080
if(ret < 0){
784
perror("sigaction");
785
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
786
1083
}
787
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
788
1085
if(ret < 0){
789
perror("sigprocmask");
790
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
791
1088
}
792
1089
793
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
794
1091
if(ret == -1){
795
perror("dup2");
796
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
797
1094
}
798
1095
799
if(dirfd(dir) < 0){
800
/* If dir has no file descriptor, we could not set FD_CLOEXEC
801
above and must now close it manually here. */
802
closedir(dir);
803
}
804
if(p->environ[0] == NULL){
805
if(execv(filename, p->argv) < 0){
806
perror("execv");
807
_exit(EXIT_FAILURE);
808
}
809
} else {
810
if(execve(filename, p->argv, p->environ) < 0){
811
perror("execve");
812
_exit(EXIT_FAILURE);
813
}
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);
814
1102
}
815
1103
/* no return */
816
1104
}
817
1105
/* Parent process */
818
1106
close(pipefd[1]); /* Close unused write end of pipe */
819
free(filename);
820
plugin *new_plugin = getplugin(dirst->d_name);
821
if (new_plugin == NULL){
822
perror("getplugin");
823
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)));
824
1114
if(ret < 0){
825
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
826
1116
}
827
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
828
1119
goto fallback;
829
1120
}
1121
free(direntries[i]);
830
1122
831
1123
new_plugin->pid = pid;
832
1124
new_plugin->fd = pipefd[0];
833
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
834
1131
/* Unblock SIGCHLD so signal handler can be run if this process
835
1132
has already completed */
836
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));
837
1136
if(ret < 0){
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
840
1139
goto fallback;
841
1140
}
842
1141
843
1142
FD_SET(new_plugin->fd, &rfds_all);
844
1143
845
if (maxfd < new_plugin->fd){
1144
if(maxfd < new_plugin->fd){
846
1145
maxfd = new_plugin->fd;
847
1146
}
848
849
1147
}
850
1148
851
closedir(dir);
852
dir = NULL;
853
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
854
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
855
1156
if(p->pid != 0){
856
1157
break;
861
1162
free_plugin_list();
862
1163
}
863
1164
}
864
1165
865
1166
/* Main loop while running plugins exist */
866
1167
while(plugin_list){
867
1168
fd_set rfds = rfds_all;
868
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
869
if (select_ret == -1){
870
perror("select");
871
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
872
1173
goto fallback;
873
1174
}
874
1175
/* OK, now either a process completed, or something can be read
875
1176
from one of them */
876
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
877
1178
/* Is this process completely done? */
878
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
879
1180
/* Only accept the plugin output if it exited cleanly */
880
1181
if(not WIFEXITED(proc->status)
881
1182
or WEXITSTATUS(proc->status) != 0){
882
1183
/* Bad exit by plugin */
883
1184
884
1185
if(debug){
885
1186
if(WIFEXITED(proc->status)){
886
fprintf(stderr, "Plugin %u exited with status %d\n",
887
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
888
1190
WEXITSTATUS(proc->status));
889
} else if(WIFSIGNALED(proc->status)) {
890
fprintf(stderr, "Plugin %u killed by signal %d\n",
891
(unsigned int) (proc->pid),
892
WTERMSIG(proc->status));
893
} else if(WCOREDUMP(proc->status)){
894
fprintf(stderr, "Plugin %d dumped core\n",
895
(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)));
896
1197
}
897
1198
}
898
1199
899
1200
/* Remove the plugin */
900
1201
FD_CLR(proc->fd, &rfds_all);
901
1202
902
1203
/* Block signal while modifying process_list */
903
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));
904
1208
if(ret < 0){
905
perror("sigprocmask");
906
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
907
1211
goto fallback;
908
1212
}
1213
1214
plugin *next_plugin = proc->next;
909
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
910
1218
/* We are done modifying process list, so unblock signal */
911
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
912
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
913
1222
if(ret < 0){
914
perror("sigprocmask");
915
exitstatus = EXIT_FAILURE;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
916
1225
goto fallback;
917
1226
}
918
1227
919
1228
if(plugin_list == NULL){
920
1229
break;
921
1230
}
1231
922
1232
continue;
923
1233
}
924
1234
925
1235
/* This process exited nicely, so print its buffer */
926
1236
927
1237
bool bret = print_out_password(proc->buffer,
928
1238
proc->buffer_length);
929
1239
if(not bret){
930
perror("print_out_password");
931
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
932
1242
}
933
1243
goto fallback;
934
1244
}
936
1246
/* This process has not completed. Does it have any output? */
937
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
938
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
939
1250
continue;
940
1251
}
941
1252
/* Before reading, make the process' data buffer large enough */
942
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
943
proc->buffer = realloc(proc->buffer, proc->buffer_size
944
+ (size_t) BUFFER_SIZE);
945
if (proc->buffer == NULL){
946
perror("malloc");
947
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;
948
1259
goto fallback;
949
1260
}
1261
proc->buffer = new_buffer;
950
1262
proc->buffer_size += BUFFER_SIZE;
951
1263
}
952
1264
/* Read from the process */
953
ret = read(proc->fd, proc->buffer + proc->buffer_length,
954
BUFFER_SIZE);
955
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){
956
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
957
1272
continue;
958
1273
}
959
if(ret == 0){
1274
if(sret == 0){
960
1275
/* got EOF */
961
1276
proc->eof = true;
962
1277
} else {
963
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
964
1279
}
965
1280
}
966
1281
}
967
968
1282
1283
969
1284
fallback:
970
1285
971
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
972
1288
/* Fallback if all plugins failed, none are found or an error
973
1289
occured */
974
1290
bool bret;
975
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
976
1292
char *passwordbuffer = getpass("Password: ");
977
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);
978
1300
if(not bret){
979
perror("print_out_password");
980
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
981
1303
}
982
1304
}
983
1305
984
1306
/* Restore old signal handler */
985
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
986
1308
if(ret == -1){
987
perror("sigaction");
988
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
989
1311
}
990
1312
991
1313
if(custom_argv != NULL){
992
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
993
1315
free(*arg);
995
1317
free(custom_argv);
996
1318
}
997
1319
998
if(dir != NULL){
999
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1000
1324
}
1001
1325
1002
/* Free the process list and kill the processes */
1326
/* Kill the processes */
1003
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1004
1328
if(p->pid != 0){
1005
1329
close(p->fd);
1006
1330
ret = kill(p->pid, SIGTERM);
1007
1331
if(ret == -1 and errno != ESRCH){
1008
1332
/* Set-uid proccesses might not get closed */
1009
perror("kill");
1333
error(0, errno, "kill");
1010
1334
}
1011
1335
}
1012
1336
}
1013
1337
1014
1338
/* Wait for any remaining child processes to terminate */
1015
do{
1339
do {
1016
1340
ret = wait(NULL);
1017
1341
} while(ret >= 0);
1018
1342
if(errno != ECHILD){
1019
perror("wait");
1343
error(0, errno, "wait");
1020
1344
}
1021
1345
1022
1346
free_plugin_list();
1023
1347
1024
1348
free(plugindir);
1349
free(pluginhelperdir);
1025
1350
free(argfile);
1026
1351
1027
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0