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- Committer: Teddy Hogeborn
- Date: 2019-07-30 19:27:59 UTC
- mfrom: (237.4.116 release)
- Revision ID: teddy@recompile.se-20190730192759-hvvvlvdi5c5tkob9
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(), exit(), EXIT_SUCCESS,
30
realloc() */
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
156
136
new_plugin->environ = malloc(sizeof(char *));
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;
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
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
203
241
return add_to_char_array(def, &(p->environ), &(p->envc));
204
242
}
205
243
244
#ifndef O_CLOEXEC
206
245
/*
207
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
247
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
249
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
253
/* If reading the flags failed, return error indication now. */
215
254
if(ret < 0){
216
255
return ret;
217
256
}
218
257
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
220
260
}
261
#endif /* not O_CLOEXEC */
221
262
222
263
223
264
/* Mark processes as completed when they exit, and save their exit
224
265
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
226
268
while(true){
227
269
plugin *proc = plugin_list;
228
270
int status;
232
274
break;
233
275
}
234
276
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
237
280
}
238
/* No child processes */
239
break;
281
error(0, errno, "waitpid");
240
282
}
241
283
242
284
/* A child exited, find it in process_list */
243
285
while(proc != NULL and proc->pid != pid){
244
286
proc = proc->next;
248
290
continue;
249
291
}
250
292
proc->status = status;
251
proc->completed = true;
293
proc->completed = 1;
252
294
}
295
errno = old_errno;
253
296
}
254
297
255
298
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
257
301
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
302
for(size_t written = 0; written < length; written += (size_t)ret){
262
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
304
length - written));
269
310
}
270
311
271
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
272
314
static void free_plugin(plugin *plugin_node){
273
315
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
275
317
free(*arg);
276
318
}
319
free(plugin_node->name);
277
320
free(plugin_node->argv);
278
321
for(char **env = plugin_node->environ; *env != NULL; env++){
279
322
free(*env);
280
323
}
281
324
free(plugin_node->environ);
282
325
free(plugin_node->buffer);
283
326
284
327
/* Removes the plugin from the singly-linked list */
285
328
if(plugin_node == plugin_list){
286
329
/* First one - simple */
306
349
307
350
int main(int argc, char *argv[]){
308
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
309
353
char *argfile = NULL;
310
354
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
355
struct dirent **direntries = NULL;
314
356
struct stat st;
315
357
fd_set rfds_all;
316
358
int ret, maxfd = 0;
359
ssize_t sret;
317
360
uid_t uid = 65534;
318
361
gid_t gid = 65534;
319
362
bool debug = false;
323
366
.sa_flags = SA_NOCLDSTOP };
324
367
char **custom_argv = NULL;
325
368
int custom_argc = 0;
369
int dir_fd = -1;
326
370
327
371
/* Establish a signal handler */
328
372
sigemptyset(&sigchld_action.sa_mask);
329
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
374
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
333
377
goto fallback;
334
378
}
335
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
380
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
339
383
goto fallback;
340
384
}
341
385
344
388
{ .name = "global-options", .key = 'g',
345
389
.arg = "OPTION[,OPTION[,...]]",
346
390
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
391
{ .name = "global-env", .key = 'G',
348
392
.arg = "VAR=value",
349
393
.doc = "Environment variable passed to all plugins" },
350
394
{ .name = "options-for", .key = 'o',
351
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
396
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
354
398
.arg = "PLUGIN:ENV=value",
355
399
.doc = "Environment variable passed to specified plugin" },
356
400
{ .name = "disable", .key = 'd',
357
401
.arg = "PLUGIN",
358
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
359
406
{ .name = "plugin-dir", .key = 128,
360
407
.arg = "DIRECTORY",
361
408
.doc = "Specify a different plugin directory", .group = 2 },
370
417
.doc = "Group ID the plugins will run as", .group = 3 },
371
418
{ .name = "debug", .key = 132,
372
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
373
433
{ .name = NULL }
374
434
};
375
435
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
379
442
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'e': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
443
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
405
456
}
406
457
break;
407
458
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0'){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0'){
415
break;
416
}
417
if(opt != NULL){
418
char *p;
419
while((p = strsep(&opt, ",")) != NULL){
420
if(p[0] == '\0'){
421
continue;
422
}
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
426
}
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
427
477
}
428
478
}
479
errno = 0;
429
480
}
430
481
break;
431
case 'f': /* --env-for */
432
if(arg == NULL){
433
break;
434
}
482
case 'E': /* --env-for */
435
483
{
436
484
char *envdef = strchr(arg, ':');
437
485
if(envdef == NULL){
438
break;
439
}
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
441
if(p_name == NULL){
442
break;
443
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
444
491
envdef++;
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
447
499
}
448
500
}
449
501
break;
450
502
case 'd': /* --disable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = true;
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
457
518
}
458
519
break;
459
520
case 128: /* --plugin-dir */
521
free(plugindir);
460
522
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
523
if(plugindir != NULL){
524
errno = 0;
525
}
464
526
break;
465
527
case 129: /* --config-file */
466
528
/* This is already done by parse_opt_config_file() */
467
529
break;
468
530
case 130: /* --userid */
469
uid = (uid_t)strtol(arg, NULL, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
470
540
break;
471
541
case 131: /* --groupid */
472
gid = (gid_t)strtol(arg, NULL, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
473
551
break;
474
552
case 132: /* --debug */
475
553
debug = true;
476
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
477
582
case ARGP_KEY_ARG:
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
break;
480
case ARGP_KEY_END:
481
break;
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
482
594
default:
483
595
return ARGP_ERR_UNKNOWN;
484
596
}
485
return 0;
597
return errno; /* Set to 0 at start */
486
598
}
487
599
488
600
/* This option parser is the same as parse_opt() above, except it
489
601
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
494
607
case 'g': /* --global-options */
495
case 'e': /* --global-env */
608
case 'G': /* --global-env */
496
609
case 'o': /* --options-for */
497
case 'f': /* --env-for */
610
case 'E': /* --env-for */
498
611
case 'd': /* --disable */
612
case 'e': /* --enable */
499
613
case 128: /* --plugin-dir */
500
614
break;
501
615
case 129: /* --config-file */
616
free(argfile);
502
617
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
505
620
}
506
break;
621
break;
507
622
case 130: /* --userid */
508
623
case 131: /* --groupid */
509
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
510
629
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
512
630
break;
513
631
default:
514
632
return ARGP_ERR_UNKNOWN;
515
633
}
516
return 0;
634
return errno;
517
635
}
518
636
519
637
struct argp argp = { .options = options,
521
639
.args_doc = "",
522
640
.doc = "Mandos plugin runner -- Run plugins" };
523
641
524
/* Parse using the parse_opt_config_file in order to get the custom
642
/* Parse using parse_opt_config_file() in order to get the custom
525
643
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
530
658
goto fallback;
531
659
}
532
660
534
662
argp.parser = parse_opt;
535
663
536
664
/* Open the configfile if available */
537
if (argfile == NULL){
665
if(argfile == NULL){
538
666
conffp = fopen(AFILE, "r");
539
667
} else {
540
668
conffp = fopen(argfile, "r");
541
}
669
}
542
670
if(conffp != NULL){
543
671
char *org_line = NULL;
544
672
char *p, *arg, *new_arg, *line;
545
673
size_t size = 0;
546
ssize_t sret;
547
674
const char whitespace_delims[] = " \r\t\f\v\n";
548
675
const char comment_delim[] = "#";
549
676
550
677
custom_argc = 1;
551
678
custom_argv = malloc(sizeof(char*) * 2);
552
679
if(custom_argv == NULL){
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
555
682
goto fallback;
556
683
}
557
684
custom_argv[0] = argv[0];
558
685
custom_argv[1] = NULL;
559
686
560
687
/* for each line in the config file, strip whitespace and ignore
561
688
commented text */
562
689
while(true){
564
691
if(sret == -1){
565
692
break;
566
693
}
567
694
568
695
line = org_line;
569
696
arg = strsep(&line, comment_delim);
570
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
573
700
}
574
701
new_arg = strdup(p);
575
702
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
578
705
free(org_line);
579
706
goto fallback;
580
707
}
581
708
582
709
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
590
722
}
591
723
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
593
725
}
594
726
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
595
735
free(org_line);
596
736
} else {
597
737
/* Check for harmful errors and go to fallback. Other errors might
598
738
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
602
742
goto fallback;
603
743
}
604
744
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
607
747
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
613
762
goto fallback;
614
763
}
615
764
}
616
765
617
766
/* Parse actual command line arguments, to let them override the
618
767
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
624
801
}
625
802
626
803
if(debug){
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
628
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
629
806
p->name ? p->name : "Global", p->argc - 1);
630
807
for(char **a = p->argv; *a != NULL; a++){
631
808
fprintf(stderr, "\tArg: %s\n", *a);
632
809
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
634
811
for(char **a = p->environ; *a != NULL; a++){
635
812
fprintf(stderr, "\t%s\n", *a);
636
813
}
637
814
}
638
815
}
639
816
640
/* Strip permissions down to nobody */
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
641
846
ret = setuid(uid);
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
663
852
{
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
671
897
}
672
898
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
673
909
}
674
910
675
911
FD_ZERO(&rfds_all);
676
912
677
913
/* Read and execute any executable in the plugin directory*/
678
while(true){
679
dirst = readdir(dir);
680
681
/* All directory entries have been processed */
682
if(dirst == NULL){
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
686
goto fallback;
687
}
688
break;
689
}
690
691
d_name_len = strlen(dirst->d_name);
692
693
/* Ignore dotfiles, backup files and other junk */
694
{
695
bool bad_name = false;
696
697
const char const *bad_prefixes[] = { ".", "#", NULL };
698
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
700
".dpkg-old",
701
".dpkg-divert", NULL };
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
703
size_t pre_len = strlen(*pre);
704
if((d_name_len >= pre_len)
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
706
if(debug){
707
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
708
" with bad prefix %s\n", dirst->d_name, *pre);
709
}
710
bad_name = true;
711
break;
712
}
713
}
714
if(bad_name){
715
continue;
716
}
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
size_t suf_len = strlen(*suf);
719
if((d_name_len >= suf_len)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
721
== 0)){
722
if(debug){
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
724
" with bad suffix %s\n", dirst->d_name, *suf);
725
}
726
bad_name = true;
727
break;
728
}
729
}
730
731
if(bad_name){
732
continue;
733
}
734
}
735
736
char *filename;
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
738
if(ret < 0){
739
perror("asprintf");
740
continue;
741
}
742
743
ret = stat(filename, &st);
744
if (ret == -1){
745
perror("stat");
746
free(filename);
747
continue;
748
}
749
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
750
930
/* Ignore non-executable files */
751
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
752
934
if(debug){
753
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
754
" with bad type or mode\n", filename);
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
755
939
}
756
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
757
942
continue;
758
943
}
759
944
760
plugin *p = getplugin(dirst->d_name);
945
plugin *p = getplugin(direntries[i]->d_name);
761
946
if(p == NULL){
762
perror("getplugin");
763
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
764
950
continue;
765
951
}
766
952
if(p->disabled){
767
953
if(debug){
768
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
769
dirst->d_name);
955
direntries[i]->d_name);
770
956
}
771
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
772
959
continue;
773
960
}
774
961
{
777
964
if(g != NULL){
778
965
for(char **a = g->argv + 1; *a != NULL; a++){
779
966
if(not add_argument(p, *a)){
780
perror("add_argument");
967
error(0, errno, "add_argument");
781
968
}
782
969
}
783
970
/* Add global environment variables */
784
971
for(char **e = g->environ; *e != NULL; e++){
785
972
if(not add_environment(p, *e, false)){
786
perror("add_environment");
973
error(0, errno, "add_environment");
787
974
}
788
975
}
789
976
}
790
977
}
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
793
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
794
980
if(p->environ[0] != NULL){
795
981
for(char **e = environ; *e != NULL; e++){
796
982
if(not add_environment(p, *e, false)){
797
perror("add_environment");
983
error(0, errno, "add_environment");
798
984
}
799
985
}
800
986
}
801
987
802
988
int pipefd[2];
803
ret = pipe(pipefd);
804
if (ret == -1){
805
perror("pipe");
806
exitstatus = EXIT_FAILURE;
807
goto fallback;
808
}
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
809
1010
/* Ask OS to automatic close the pipe on exec */
810
1011
ret = set_cloexec_flag(pipefd[0]);
811
1012
if(ret < 0){
812
perror("set_cloexec_flag");
813
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
814
1018
goto fallback;
815
1019
}
816
1020
ret = set_cloexec_flag(pipefd[1]);
817
1021
if(ret < 0){
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
820
1027
goto fallback;
821
1028
}
1029
#endif /* not O_CLOEXEC */
822
1030
/* Block SIGCHLD until process is safely in process list */
823
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
824
1034
if(ret < 0){
825
perror("sigprocmask");
826
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
827
1038
goto fallback;
828
1039
}
829
1040
/* Starting a new process to be watched */
830
pid_t pid = fork();
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
831
1045
if(pid == -1){
832
perror("fork");
833
exitstatus = EXIT_FAILURE;
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
834
1053
goto fallback;
835
1054
}
836
1055
if(pid == 0){
837
1056
/* this is the child process */
838
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
839
1058
if(ret < 0){
840
perror("sigaction");
841
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
842
1061
}
843
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
844
1063
if(ret < 0){
845
perror("sigprocmask");
846
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
847
1066
}
848
1067
849
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
850
1069
if(ret == -1){
851
perror("dup2");
852
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
853
1072
}
854
1073
855
if(dirfd(dir) < 0){
856
/* If dir has no file descriptor, we could not set FD_CLOEXEC
857
above and must now close it manually here. */
858
closedir(dir);
859
}
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
862
perror("execv");
863
_exit(EXIT_FAILURE);
864
}
865
} else {
866
if(execve(filename, p->argv, p->environ) < 0){
867
perror("execve");
868
_exit(EXIT_FAILURE);
869
}
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
870
1080
}
871
1081
/* no return */
872
1082
}
873
1083
/* Parent process */
874
1084
close(pipefd[1]); /* Close unused write end of pipe */
875
free(filename);
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
878
perror("getplugin");
879
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
880
1092
if(ret < 0){
881
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
882
1094
}
883
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
884
1097
goto fallback;
885
1098
}
1099
free(direntries[i]);
886
1100
887
1101
new_plugin->pid = pid;
888
1102
new_plugin->fd = pipefd[0];
889
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
890
1109
/* Unblock SIGCHLD so signal handler can be run if this process
891
1110
has already completed */
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
893
1114
if(ret < 0){
894
perror("sigprocmask");
895
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
896
1117
goto fallback;
897
1118
}
898
1119
899
1120
FD_SET(new_plugin->fd, &rfds_all);
900
1121
901
if (maxfd < new_plugin->fd){
1122
if(maxfd < new_plugin->fd){
902
1123
maxfd = new_plugin->fd;
903
1124
}
904
905
1125
}
906
1126
907
closedir(dir);
908
dir = NULL;
909
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
910
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
911
1134
if(p->pid != 0){
912
1135
break;
917
1140
free_plugin_list();
918
1141
}
919
1142
}
920
1143
921
1144
/* Main loop while running plugins exist */
922
1145
while(plugin_list){
923
1146
fd_set rfds = rfds_all;
924
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
925
if (select_ret == -1){
926
perror("select");
927
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
928
1151
goto fallback;
929
1152
}
930
1153
/* OK, now either a process completed, or something can be read
931
1154
from one of them */
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
933
1156
/* Is this process completely done? */
934
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
935
1158
/* Only accept the plugin output if it exited cleanly */
936
1159
if(not WIFEXITED(proc->status)
937
1160
or WEXITSTATUS(proc->status) != 0){
938
1161
/* Bad exit by plugin */
939
1162
940
1163
if(debug){
941
1164
if(WIFEXITED(proc->status)){
942
fprintf(stderr, "Plugin %u exited with status %d\n",
943
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
944
1168
WEXITSTATUS(proc->status));
945
} else if(WIFSIGNALED(proc->status)) {
946
fprintf(stderr, "Plugin %u killed by signal %d\n",
947
(unsigned int) (proc->pid),
948
WTERMSIG(proc->status));
949
} else if(WCOREDUMP(proc->status)){
950
fprintf(stderr, "Plugin %d dumped core\n",
951
(unsigned int) (proc->pid));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
952
1175
}
953
1176
}
954
1177
955
1178
/* Remove the plugin */
956
1179
FD_CLR(proc->fd, &rfds_all);
957
1180
958
1181
/* Block signal while modifying process_list */
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
960
1186
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
963
1189
goto fallback;
964
1190
}
1191
1192
plugin *next_plugin = proc->next;
965
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
966
1196
/* We are done modifying process list, so unblock signal */
967
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
968
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
969
1200
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
972
1203
goto fallback;
973
1204
}
974
1205
975
1206
if(plugin_list == NULL){
976
1207
break;
977
1208
}
1209
978
1210
continue;
979
1211
}
980
1212
981
1213
/* This process exited nicely, so print its buffer */
982
1214
983
1215
bool bret = print_out_password(proc->buffer,
984
1216
proc->buffer_length);
985
1217
if(not bret){
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
988
1220
}
989
1221
goto fallback;
990
1222
}
992
1224
/* This process has not completed. Does it have any output? */
993
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
994
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
995
1228
continue;
996
1229
}
997
1230
/* Before reading, make the process' data buffer large enough */
998
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
999
proc->buffer = realloc(proc->buffer, proc->buffer_size
1000
+ (size_t) BUFFER_SIZE);
1001
if (proc->buffer == NULL){
1002
perror("malloc");
1003
exitstatus = EXIT_FAILURE;
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
1004
1237
goto fallback;
1005
1238
}
1239
proc->buffer = new_buffer;
1006
1240
proc->buffer_size += BUFFER_SIZE;
1007
1241
}
1008
1242
/* Read from the process */
1009
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1010
BUFFER_SIZE);
1011
if(ret < 0){
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
1012
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
1013
1250
continue;
1014
1251
}
1015
if(ret == 0){
1252
if(sret == 0){
1016
1253
/* got EOF */
1017
1254
proc->eof = true;
1018
1255
} else {
1019
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
1020
1257
}
1021
1258
}
1022
1259
}
1023
1024
1260
1261
1025
1262
fallback:
1026
1263
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1028
1266
/* Fallback if all plugins failed, none are found or an error
1029
1267
occured */
1030
1268
bool bret;
1031
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1032
1270
char *passwordbuffer = getpass("Password: ");
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
1034
1278
if(not bret){
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
1037
1281
}
1038
1282
}
1039
1283
1040
1284
/* Restore old signal handler */
1041
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1042
1286
if(ret == -1){
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1045
1289
}
1046
1290
1047
1291
if(custom_argv != NULL){
1048
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1049
1293
free(*arg);
1051
1295
free(custom_argv);
1052
1296
}
1053
1297
1054
if(dir != NULL){
1055
closedir(dir);
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1056
1302
}
1057
1303
1058
/* Free the process list and kill the processes */
1304
/* Kill the processes */
1059
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
1306
if(p->pid != 0){
1061
1307
close(p->fd);
1062
1308
ret = kill(p->pid, SIGTERM);
1063
1309
if(ret == -1 and errno != ESRCH){
1064
1310
/* Set-uid proccesses might not get closed */
1065
perror("kill");
1311
error(0, errno, "kill");
1066
1312
}
1067
1313
}
1068
1314
}
1069
1315
1070
1316
/* Wait for any remaining child processes to terminate */
1071
do{
1317
do {
1072
1318
ret = wait(NULL);
1073
1319
} while(ret >= 0);
1074
1320
if(errno != ECHILD){
1075
perror("wait");
1321
error(0, errno, "wait");
1076
1322
}
1077
1323
1078
1324
free_plugin_list();
1079
1325
1080
1326
free(plugindir);
1327
free(pluginhelperdir);
1081
1328
free(argfile);
1082
1329
1083
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0