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- Committer: Teddy Hogeborn
- Date: 2008-09-01 08:29:23 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901082923-i2liq6t7warmu9xe
* mandos.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
* overview.xml: - '' -
* plugin-runner.xml (DESCRIPTION): Improved wording.
(PURPOSE): New section.
(OPTIONS): Improved wording.
(OVERVIEW, PLUGINS): New section.
(FALLBACK): New empty placeholder section.
* plugins.d/password-prompt.xml: Enclose "RAM" with <acronym>.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 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
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
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() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
71
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
84
76
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
89
81
char **environ;
90
82
int envc;
91
83
bool disabled;
92
84
93
85
/* Variables used for running processes*/
94
86
pid_t pid;
95
87
int fd;
97
89
size_t buffer_size;
98
90
size_t buffer_length;
99
91
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
92
volatile bool completed;
93
volatile int status;
102
94
struct plugin *next;
103
95
} plugin;
104
96
105
97
static plugin *plugin_list = NULL;
106
98
107
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
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))){
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))){
115
106
return p;
116
107
}
117
108
}
118
109
/* Create a new plugin */
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){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
124
112
return NULL;
125
113
}
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
118
return NULL;
136
119
}
137
120
}
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;
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){
149
129
free(copy_name);
150
130
free(new_plugin);
151
errno = e;
152
131
return NULL;
153
132
}
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
161
int e = errno;
162
138
free(copy_name);
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
165
errno = e;
166
141
return NULL;
167
142
}
168
143
new_plugin->environ[0] = NULL;
169
144
170
145
/* Append the new plugin to the list */
171
146
plugin_list = new_plugin;
172
147
return new_plugin;
173
148
}
174
149
175
150
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
151
static bool add_to_char_array(const char *new, char ***array,
178
152
int *len){
179
153
/* Resize the pointed-to array to hold one more pointer */
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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
185
156
/* Malloc check */
186
if(new_array == NULL){
157
if(*array == NULL){
187
158
return false;
188
159
}
189
*array = new_array;
190
160
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
195
162
if(copy == NULL){
196
163
return false;
197
164
}
204
171
}
205
172
206
173
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
174
static bool add_argument(plugin *p, const char *arg){
209
175
if(p == NULL){
210
176
return false;
213
179
}
214
180
215
181
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
182
static bool add_environment(plugin *p, const char *def){
218
183
if(p == NULL){
219
184
return false;
220
185
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
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){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
186
return add_to_char_array(def, &(p->environ), &(p->envc));
242
187
}
243
188
244
#ifndef O_CLOEXEC
245
189
/*
246
190
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
191
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
192
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
193
*/
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));
194
static int set_cloexec_flag(int fd)
195
{
196
int ret = fcntl(fd, F_GETFD, 0);
253
197
/* If reading the flags failed, return error indication now. */
254
198
if(ret < 0){
255
199
return ret;
256
200
}
257
201
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
202
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
203
}
261
#endif /* not O_CLOEXEC */
262
204
263
205
264
206
/* Mark processes as completed when they exit, and save their exit
265
207
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
208
void handle_sigchld(__attribute__((unused)) int sig){
268
209
while(true){
269
210
plugin *proc = plugin_list;
270
211
int status;
274
215
break;
275
216
}
276
217
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
218
if (errno != ECHILD){
219
perror("waitpid");
280
220
}
281
error(0, errno, "waitpid");
221
/* No child processes */
222
break;
282
223
}
283
224
284
225
/* A child exited, find it in process_list */
285
226
while(proc != NULL and proc->pid != pid){
286
227
proc = proc->next;
290
231
continue;
291
232
}
292
233
proc->status = status;
293
proc->completed = 1;
234
proc->completed = true;
294
235
}
295
errno = old_errno;
296
236
}
297
237
298
238
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
239
bool print_out_password(const char *buffer, size_t length){
301
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
302
244
for(size_t written = 0; written < length; written += (size_t)ret){
303
245
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
246
length - written));
310
252
}
311
253
312
254
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
255
static void free_plugin(plugin *plugin_node){
315
256
316
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
263
}
323
264
free(plugin_node->environ);
324
265
free(plugin_node->buffer);
325
266
326
267
/* Removes the plugin from the singly-linked list */
327
268
if(plugin_node == plugin_list){
328
269
/* First one - simple */
348
289
349
290
int main(int argc, char *argv[]){
350
291
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
292
char *argfile = NULL;
353
293
FILE *conffp;
354
struct dirent **direntries = NULL;
294
size_t d_name_len;
295
DIR *dir = NULL;
296
struct dirent *dirst;
355
297
struct stat st;
356
298
fd_set rfds_all;
357
299
int ret, maxfd = 0;
358
ssize_t sret;
359
300
uid_t uid = 65534;
360
301
gid_t gid = 65534;
361
302
bool debug = false;
365
306
.sa_flags = SA_NOCLDSTOP };
366
307
char **custom_argv = NULL;
367
308
int custom_argc = 0;
368
int dir_fd = -1;
369
309
370
310
/* Establish a signal handler */
371
311
sigemptyset(&sigchld_action.sa_mask);
372
312
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
313
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
314
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
376
316
goto fallback;
377
317
}
378
318
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
319
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
320
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
382
322
goto fallback;
383
323
}
384
324
387
327
{ .name = "global-options", .key = 'g',
388
328
.arg = "OPTION[,OPTION[,...]]",
389
329
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
330
{ .name = "global-envs", .key = 'e',
391
331
.arg = "VAR=value",
392
332
.doc = "Environment variable passed to all plugins" },
393
333
{ .name = "options-for", .key = 'o',
394
334
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
335
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
336
{ .name = "envs-for", .key = 'f',
397
337
.arg = "PLUGIN:ENV=value",
398
338
.doc = "Environment variable passed to specified plugin" },
399
339
{ .name = "disable", .key = 'd',
400
340
.arg = "PLUGIN",
401
341
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
342
{ .name = "plugin-dir", .key = 128,
406
343
.arg = "DIRECTORY",
407
344
.doc = "Specify a different plugin directory", .group = 2 },
416
353
.doc = "Group ID the plugins will run as", .group = 3 },
417
354
{ .name = "debug", .key = 132,
418
355
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
432
356
{ .name = NULL }
433
357
};
434
358
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
363
switch (key) {
441
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
442
382
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
455
390
}
456
391
break;
457
392
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
476
412
}
477
413
}
478
errno = 0;
479
414
}
480
415
break;
481
case 'E': /* --env-for */
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
482
420
{
483
421
char *envdef = strchr(arg, ':');
484
422
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
490
429
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
498
432
}
499
433
}
500
434
break;
501
435
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
517
442
}
518
443
break;
519
444
case 128: /* --plugin-dir */
520
free(plugindir);
521
445
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
446
if(plugindir == NULL){
447
perror("strdup");
448
}
525
449
break;
526
450
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
529
456
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
457
uid = (uid_t)strtol(arg, NULL, 10);
539
458
break;
540
459
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
460
gid = (gid_t)strtol(arg, NULL, 10);
550
461
break;
551
462
case 132: /* --debug */
552
463
debug = true;
553
464
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
__builtin_unreachable();
568
case -3: /* --usage */
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
570
argp_state_help(state, state->out_stream,
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
__builtin_unreachable();
573
case 'V': /* --version */
574
fprintf(state->out_stream, "%s\n", argp_program_version);
575
exit(EXIT_SUCCESS);
576
break;
577
/*
578
* When adding more options before this line, remember to also add a
579
* "case" to the "parse_opt_config_file" function below.
580
*/
581
case ARGP_KEY_ARG:
582
/* Cryptsetup always passes an argument, which is an empty
583
string if "none" was specified in /etc/crypttab. So if
584
argument was empty, we ignore it silently. */
585
if(arg[0] == '\0'){
586
break;
587
}
588
/* FALLTHROUGH */
589
default:
590
return ARGP_ERR_UNKNOWN;
591
}
592
return errno; /* Set to 0 at start */
593
}
594
595
/* This option parser is the same as parse_opt() above, except it
596
ignores everything but the --config-file option. */
597
error_t parse_opt_config_file(int key, char *arg,
598
__attribute__((unused))
599
struct argp_state *state){
600
errno = 0;
601
switch(key){
602
case 'g': /* --global-options */
603
case 'G': /* --global-env */
604
case 'o': /* --options-for */
605
case 'E': /* --env-for */
606
case 'd': /* --disable */
607
case 'e': /* --enable */
608
case 128: /* --plugin-dir */
609
break;
610
case 129: /* --config-file */
611
free(argfile);
612
argfile = strdup(arg);
613
if(argfile != NULL){
614
errno = 0;
615
}
616
break;
617
case 130: /* --userid */
618
case 131: /* --groupid */
619
case 132: /* --debug */
620
case 133: /* --plugin-helper-dir */
621
case '?': /* --help */
622
case -3: /* --usage */
623
case 'V': /* --version */
624
case ARGP_KEY_ARG:
625
break;
626
default:
627
return ARGP_ERR_UNKNOWN;
628
}
629
return errno;
630
}
631
632
struct argp argp = { .options = options,
633
.parser = parse_opt_config_file,
634
.args_doc = "",
465
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
467
break;
468
case ARGP_KEY_END:
469
break;
470
default:
471
return ARGP_ERR_UNKNOWN;
472
}
473
return 0;
474
}
475
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
635
478
.doc = "Mandos plugin runner -- Run plugins" };
636
479
637
/* Parse using parse_opt_config_file() in order to get the custom
638
config file location, if any. */
639
ret = argp_parse(&argp, argc, argv,
640
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
641
NULL, NULL);
642
switch(ret){
643
case 0:
644
break;
645
case ENOMEM:
646
default:
647
errno = ret;
648
error(0, errno, "argp_parse");
649
exitstatus = EX_OSERR;
650
goto fallback;
651
case EINVAL:
652
exitstatus = EX_USAGE;
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
481
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
483
exitstatus = EXIT_FAILURE;
653
484
goto fallback;
654
485
}
655
656
/* Reset to the normal argument parser */
657
argp.parser = parse_opt;
658
659
/* Open the configfile if available */
660
if(argfile == NULL){
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
661
489
conffp = fopen(AFILE, "r");
662
490
} else {
663
491
conffp = fopen(argfile, "r");
664
}
492
}
665
493
if(conffp != NULL){
666
494
char *org_line = NULL;
667
495
char *p, *arg, *new_arg, *line;
668
496
size_t size = 0;
497
ssize_t sret;
669
498
const char whitespace_delims[] = " \r\t\f\v\n";
670
499
const char comment_delim[] = "#";
671
500
672
501
custom_argc = 1;
673
502
custom_argv = malloc(sizeof(char*) * 2);
674
503
if(custom_argv == NULL){
675
error(0, errno, "malloc");
676
exitstatus = EX_OSERR;
504
perror("malloc");
505
exitstatus = EXIT_FAILURE;
677
506
goto fallback;
678
507
}
679
508
custom_argv[0] = argv[0];
680
509
custom_argv[1] = NULL;
681
510
682
511
/* for each line in the config file, strip whitespace and ignore
683
512
commented text */
684
513
while(true){
686
515
if(sret == -1){
687
516
break;
688
517
}
689
518
690
519
line = org_line;
691
520
arg = strsep(&line, comment_delim);
692
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
695
524
}
696
525
new_arg = strdup(p);
697
526
if(new_arg == NULL){
698
error(0, errno, "strdup");
699
exitstatus = EX_OSERR;
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
700
529
free(org_line);
701
530
goto fallback;
702
531
}
703
532
704
533
custom_argc += 1;
705
{
706
char **new_argv = realloc(custom_argv, sizeof(char *)
707
* ((size_t)custom_argc + 1));
708
if(new_argv == NULL){
709
error(0, errno, "realloc");
710
exitstatus = EX_OSERR;
711
free(new_arg);
712
free(org_line);
713
goto fallback;
714
} else {
715
custom_argv = new_argv;
716
}
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
717
541
}
718
542
custom_argv[custom_argc-1] = new_arg;
719
custom_argv[custom_argc] = NULL;
543
custom_argv[custom_argc] = NULL;
720
544
}
721
545
}
722
do {
723
ret = fclose(conffp);
724
} while(ret == EOF and errno == EINTR);
725
if(ret == EOF){
726
error(0, errno, "fclose");
727
exitstatus = EX_IOERR;
728
goto fallback;
729
}
730
546
free(org_line);
731
} else {
547
} else{
732
548
/* Check for harmful errors and go to fallback. Other errors might
733
549
not affect opening plugins */
734
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
735
error(0, errno, "fopen");
736
exitstatus = EX_OSERR;
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
737
553
goto fallback;
738
554
}
739
555
}
740
/* If there were any arguments from the configuration file, pass
741
them to parser as command line arguments */
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
742
558
if(custom_argv != NULL){
743
ret = argp_parse(&argp, custom_argc, custom_argv,
744
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
745
NULL, NULL);
746
switch(ret){
747
case 0:
748
break;
749
case ENOMEM:
750
default:
751
errno = ret;
752
error(0, errno, "argp_parse");
753
exitstatus = EX_OSERR;
754
goto fallback;
755
case EINVAL:
756
exitstatus = EX_CONFIG;
757
goto fallback;
758
}
759
}
760
761
/* Parse actual command line arguments, to let them override the
762
config file */
763
ret = argp_parse(&argp, argc, argv,
764
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
765
NULL, NULL);
766
switch(ret){
767
case 0:
768
break;
769
case ENOMEM:
770
default:
771
errno = ret;
772
error(0, errno, "argp_parse");
773
exitstatus = EX_OSERR;
774
goto fallback;
775
case EINVAL:
776
exitstatus = EX_USAGE;
777
goto fallback;
778
}
779
780
{
781
char *pluginhelperenv;
782
bool bret = true;
783
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
784
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
785
if(ret != -1){
786
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
787
}
788
if(ret == -1 or not bret){
789
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
790
" environment variable to \"%s\" for all plugins\n",
791
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
}
793
if(ret != -1){
794
free(pluginhelperenv);
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
560
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
795
564
}
796
565
}
797
566
798
567
if(debug){
799
for(plugin *p = plugin_list; p != NULL; p = p->next){
568
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
569
fprintf(stderr, "Plugin: %s has %d arguments\n",
801
570
p->name ? p->name : "Global", p->argc - 1);
802
571
for(char **a = p->argv; *a != NULL; a++){
803
572
fprintf(stderr, "\tArg: %s\n", *a);
804
573
}
805
fprintf(stderr, "...and %d environment variables\n", p->envc);
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
806
575
for(char **a = p->environ; *a != NULL; a++){
807
576
fprintf(stderr, "\t%s\n", *a);
808
577
}
809
578
}
810
579
}
811
812
if(getuid() == 0){
813
/* Work around Debian bug #633582:
814
<https://bugs.debian.org/633582> */
815
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
816
if(plugindir_fd == -1){
817
if(errno != ENOENT){
818
error(0, errno, "open(\"" PDIR "\")");
819
}
820
} else {
821
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
822
if(ret == -1){
823
error(0, errno, "fstat");
824
} else {
825
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
826
ret = fchown(plugindir_fd, uid, gid);
827
if(ret == -1){
828
error(0, errno, "fchown");
829
}
830
}
831
}
832
close(plugindir_fd);
833
}
834
}
835
836
/* Lower permissions */
837
ret = setgid(gid);
838
if(ret == -1){
839
error(0, errno, "setgid");
840
}
580
581
/* Strip permissions down to nobody */
841
582
ret = setuid(uid);
842
if(ret == -1){
843
error(0, errno, "setuid");
844
}
845
846
/* Open plugin directory with close_on_exec flag */
583
if (ret == -1){
584
perror("setuid");
585
}
586
setgid(gid);
587
if (ret == -1){
588
perror("setgid");
589
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
597
if(dir == NULL){
598
perror("Could not open plugin dir");
599
exitstatus = EXIT_FAILURE;
600
goto fallback;
601
}
602
603
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
604
{
848
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#ifdef O_CLOEXEC
850
O_CLOEXEC
851
#else /* not O_CLOEXEC */
852
0
853
#endif /* not O_CLOEXEC */
854
);
855
if(dir_fd == -1){
856
error(0, errno, "Could not open plugin dir");
857
exitstatus = EX_UNAVAILABLE;
858
goto fallback;
859
}
860
861
#ifndef O_CLOEXEC
862
/* Set the FD_CLOEXEC flag on the directory */
863
ret = set_cloexec_flag(dir_fd);
864
if(ret < 0){
865
error(0, errno, "set_cloexec_flag");
866
exitstatus = EX_OSERR;
867
goto fallback;
868
}
869
#endif /* O_CLOEXEC */
870
}
871
872
int good_name(const struct dirent * const dirent){
873
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
874
"*.dpkg-old", "*.dpkg-bak",
875
"*.dpkg-divert", NULL };
876
#ifdef __GNUC__
877
#pragma GCC diagnostic push
878
#pragma GCC diagnostic ignored "-Wcast-qual"
879
#endif
880
for(const char **pat = (const char **)patterns;
881
*pat != NULL; pat++){
882
#ifdef __GNUC__
883
#pragma GCC diagnostic pop
884
#endif
885
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
!= FNM_NOMATCH){
887
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" matching pattern %s\n", dirent->d_name, *pat);
890
}
891
return 0;
605
int dir_fd = dirfd(dir);
606
if(dir_fd >= 0){
607
ret = set_cloexec_flag(dir_fd);
608
if(ret < 0){
609
perror("set_cloexec_flag");
610
exitstatus = EXIT_FAILURE;
611
goto fallback;
892
612
}
893
613
}
894
return 1;
895
}
896
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
if(numplugins == -1){
900
error(0, errno, "Could not scan plugin dir");
901
direntries = NULL;
902
exitstatus = EX_OSERR;
903
goto fallback;
904
614
}
905
615
906
616
FD_ZERO(&rfds_all);
907
617
908
618
/* Read and execute any executable in the plugin directory*/
909
for(int i = 0; i < numplugins; i++){
910
911
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
912
if(plugin_fd == -1){
913
error(0, errno, "Could not open plugin");
914
free(direntries[i]);
915
continue;
916
}
917
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
918
if(ret == -1){
919
error(0, errno, "stat");
920
close(plugin_fd);
921
free(direntries[i]);
922
continue;
923
}
924
619
while(true){
620
dirst = readdir(dir);
621
622
// All directory entries have been processed
623
if(dirst == NULL){
624
if (errno == EBADF){
625
perror("readdir");
626
exitstatus = EXIT_FAILURE;
627
goto fallback;
628
}
629
break;
630
}
631
632
d_name_len = strlen(dirst->d_name);
633
634
// Ignore dotfiles, backup files and other junk
635
{
636
bool bad_name = false;
637
638
const char const *bad_prefixes[] = { ".", "#", NULL };
639
640
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
641
".dpkg-old",
642
".dpkg-divert", NULL };
643
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
644
size_t pre_len = strlen(*pre);
645
if((d_name_len >= pre_len)
646
and strncmp((dirst->d_name), *pre, pre_len) == 0){
647
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad prefix %s\n", dirst->d_name, *pre);
650
}
651
bad_name = true;
652
break;
653
}
654
}
655
if(bad_name){
656
continue;
657
}
658
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
size_t suf_len = strlen(*suf);
660
if((d_name_len >= suf_len)
661
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
662
== 0)){
663
if(debug){
664
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
665
" with bad suffix %s\n", dirst->d_name, *suf);
666
}
667
bad_name = true;
668
break;
669
}
670
}
671
672
if(bad_name){
673
continue;
674
}
675
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
682
}
683
684
ret = stat(filename, &st);
685
if (ret == -1){
686
perror("stat");
687
free(filename);
688
continue;
689
}
690
925
691
/* Ignore non-executable files */
926
if(not S_ISREG(st.st_mode)
927
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
X_OK, 0)) != 0)){
692
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
929
693
if(debug){
930
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
931
" with bad type or mode\n",
932
plugindir != NULL ? plugindir : PDIR,
933
direntries[i]->d_name);
694
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
695
" with bad type or mode\n", filename);
934
696
}
935
close(plugin_fd);
936
free(direntries[i]);
697
free(filename);
937
698
continue;
938
699
}
939
700
940
plugin *p = getplugin(direntries[i]->d_name);
701
plugin *p = getplugin(dirst->d_name);
941
702
if(p == NULL){
942
error(0, errno, "getplugin");
943
close(plugin_fd);
944
free(direntries[i]);
703
perror("getplugin");
704
free(filename);
945
705
continue;
946
706
}
947
707
if(p->disabled){
948
708
if(debug){
949
709
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
950
direntries[i]->d_name);
710
dirst->d_name);
951
711
}
952
close(plugin_fd);
953
free(direntries[i]);
712
free(filename);
954
713
continue;
955
714
}
956
715
{
959
718
if(g != NULL){
960
719
for(char **a = g->argv + 1; *a != NULL; a++){
961
720
if(not add_argument(p, *a)){
962
error(0, errno, "add_argument");
721
perror("add_argument");
963
722
}
964
723
}
965
724
/* Add global environment variables */
966
725
for(char **e = g->environ; *e != NULL; e++){
967
if(not add_environment(p, *e, false)){
968
error(0, errno, "add_environment");
726
if(not add_environment(p, *e)){
727
perror("add_environment");
969
728
}
970
729
}
971
730
}
972
731
}
973
/* If this plugin has any environment variables, we need to
974
duplicate the environment from this process, too. */
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
975
735
if(p->environ[0] != NULL){
976
736
for(char **e = environ; *e != NULL; e++){
977
if(not add_environment(p, *e, false)){
978
error(0, errno, "add_environment");
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
979
744
}
980
745
}
981
746
}
982
747
983
748
int pipefd[2];
984
#ifndef O_CLOEXEC
985
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
986
#else /* O_CLOEXEC */
987
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
988
#endif /* O_CLOEXEC */
989
if(ret == -1){
990
error(0, errno, "pipe");
991
exitstatus = EX_OSERR;
992
free(direntries[i]);
993
goto fallback;
994
}
995
if(pipefd[0] >= FD_SETSIZE){
996
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
997
FD_SETSIZE);
998
close(pipefd[0]);
999
close(pipefd[1]);
1000
exitstatus = EX_OSERR;
1001
free(direntries[i]);
1002
goto fallback;
1003
}
1004
#ifndef O_CLOEXEC
749
ret = pipe(pipefd);
750
if (ret == -1){
751
perror("pipe");
752
exitstatus = EXIT_FAILURE;
753
goto fallback;
754
}
1005
755
/* Ask OS to automatic close the pipe on exec */
1006
756
ret = set_cloexec_flag(pipefd[0]);
1007
757
if(ret < 0){
1008
error(0, errno, "set_cloexec_flag");
1009
close(pipefd[0]);
1010
close(pipefd[1]);
1011
exitstatus = EX_OSERR;
1012
free(direntries[i]);
758
perror("set_cloexec_flag");
759
exitstatus = EXIT_FAILURE;
1013
760
goto fallback;
1014
761
}
1015
762
ret = set_cloexec_flag(pipefd[1]);
1016
763
if(ret < 0){
1017
error(0, errno, "set_cloexec_flag");
1018
close(pipefd[0]);
1019
close(pipefd[1]);
1020
exitstatus = EX_OSERR;
1021
free(direntries[i]);
764
perror("set_cloexec_flag");
765
exitstatus = EXIT_FAILURE;
1022
766
goto fallback;
1023
767
}
1024
#endif /* not O_CLOEXEC */
1025
768
/* Block SIGCHLD until process is safely in process list */
1026
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1027
&sigchld_action.sa_mask,
1028
NULL));
769
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1029
770
if(ret < 0){
1030
error(0, errno, "sigprocmask");
1031
exitstatus = EX_OSERR;
1032
free(direntries[i]);
771
perror("sigprocmask");
772
exitstatus = EXIT_FAILURE;
1033
773
goto fallback;
1034
774
}
1035
/* Starting a new process to be watched */
1036
pid_t pid;
1037
do {
1038
pid = fork();
1039
} while(pid == -1 and errno == EINTR);
775
// Starting a new process to be watched
776
pid_t pid = fork();
1040
777
if(pid == -1){
1041
error(0, errno, "fork");
1042
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
&sigchld_action.sa_mask, NULL));
1044
close(pipefd[0]);
1045
close(pipefd[1]);
1046
exitstatus = EX_OSERR;
1047
free(direntries[i]);
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
1048
780
goto fallback;
1049
781
}
1050
782
if(pid == 0){
1051
783
/* this is the child process */
1052
784
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
785
if(ret < 0){
1054
error(0, errno, "sigaction");
1055
_exit(EX_OSERR);
786
perror("sigaction");
787
_exit(EXIT_FAILURE);
1056
788
}
1057
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1058
790
if(ret < 0){
1059
error(0, errno, "sigprocmask");
1060
_exit(EX_OSERR);
791
perror("sigprocmask");
792
_exit(EXIT_FAILURE);
1061
793
}
1062
794
1063
795
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1064
796
if(ret == -1){
1065
error(0, errno, "dup2");
1066
_exit(EX_OSERR);
797
perror("dup2");
798
_exit(EXIT_FAILURE);
1067
799
}
1068
800
1069
if(fexecve(plugin_fd, p->argv,
1070
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1071
error(0, errno, "fexecve for %s/%s",
1072
plugindir != NULL ? plugindir : PDIR,
1073
direntries[i]->d_name);
1074
_exit(EX_OSERR);
801
if(dirfd(dir) < 0){
802
/* If dir has no file descriptor, we could not set FD_CLOEXEC
803
above and must now close it manually here. */
804
closedir(dir);
805
}
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
1075
816
}
1076
817
/* no return */
1077
818
}
1078
819
/* Parent process */
1079
820
close(pipefd[1]); /* Close unused write end of pipe */
1080
close(plugin_fd);
1081
plugin *new_plugin = getplugin(direntries[i]->d_name);
1082
if(new_plugin == NULL){
1083
error(0, errno, "getplugin");
1084
ret = (int)(TEMP_FAILURE_RETRY
1085
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1086
NULL)));
821
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
825
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1087
826
if(ret < 0){
1088
error(0, errno, "sigprocmask");
827
perror("sigprocmask");
1089
828
}
1090
exitstatus = EX_OSERR;
1091
free(direntries[i]);
829
exitstatus = EXIT_FAILURE;
1092
830
goto fallback;
1093
831
}
1094
free(direntries[i]);
1095
832
1096
833
new_plugin->pid = pid;
1097
834
new_plugin->fd = pipefd[0];
1098
1099
if(debug){
1100
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1101
new_plugin->name, (intmax_t) (new_plugin->pid));
1102
}
1103
835
1104
836
/* Unblock SIGCHLD so signal handler can be run if this process
1105
837
has already completed */
1106
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1107
&sigchld_action.sa_mask,
1108
NULL));
838
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
839
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
exitstatus = EX_OSERR;
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1112
842
goto fallback;
1113
843
}
1114
844
1115
845
FD_SET(new_plugin->fd, &rfds_all);
1116
846
1117
if(maxfd < new_plugin->fd){
847
if (maxfd < new_plugin->fd){
1118
848
maxfd = new_plugin->fd;
1119
849
}
850
1120
851
}
1121
852
1122
free(direntries);
1123
direntries = NULL;
1124
close(dir_fd);
1125
dir_fd = -1;
1126
free_plugin(getplugin(NULL));
1127
853
closedir(dir);
854
dir = NULL;
855
1128
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
1129
857
if(p->pid != 0){
1130
858
break;
1135
863
free_plugin_list();
1136
864
}
1137
865
}
1138
866
1139
867
/* Main loop while running plugins exist */
1140
868
while(plugin_list){
1141
869
fd_set rfds = rfds_all;
1142
870
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1143
if(select_ret == -1 and errno != EINTR){
1144
error(0, errno, "select");
1145
exitstatus = EX_OSERR;
871
if (select_ret == -1){
872
perror("select");
873
exitstatus = EXIT_FAILURE;
1146
874
goto fallback;
1147
875
}
1148
876
/* OK, now either a process completed, or something can be read
1149
877
from one of them */
1150
for(plugin *proc = plugin_list; proc != NULL;){
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1151
879
/* Is this process completely done? */
1152
if(proc->completed and proc->eof){
880
if(proc->eof and proc->completed){
1153
881
/* Only accept the plugin output if it exited cleanly */
1154
882
if(not WIFEXITED(proc->status)
1155
883
or WEXITSTATUS(proc->status) != 0){
1156
884
/* Bad exit by plugin */
1157
885
1158
886
if(debug){
1159
887
if(WIFEXITED(proc->status)){
1160
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1161
" status %d\n", proc->name,
1162
(intmax_t) (proc->pid),
888
fprintf(stderr, "Plugin %u exited with status %d\n",
889
(unsigned int) (proc->pid),
1163
890
WEXITSTATUS(proc->status));
1164
} else if(WIFSIGNALED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1166
" signal %d: %s\n", proc->name,
1167
(intmax_t) (proc->pid),
1168
WTERMSIG(proc->status),
1169
strsignal(WTERMSIG(proc->status)));
891
} else if(WIFSIGNALED(proc->status)) {
892
fprintf(stderr, "Plugin %u killed by signal %d\n",
893
(unsigned int) (proc->pid),
894
WTERMSIG(proc->status));
895
} else if(WCOREDUMP(proc->status)){
896
fprintf(stderr, "Plugin %d dumped core\n",
897
(unsigned int) (proc->pid));
1170
898
}
1171
899
}
1172
900
1173
901
/* Remove the plugin */
1174
902
FD_CLR(proc->fd, &rfds_all);
1175
903
1176
904
/* Block signal while modifying process_list */
1177
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1178
(SIG_BLOCK,
1179
&sigchld_action.sa_mask,
1180
NULL));
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1181
906
if(ret < 0){
1182
error(0, errno, "sigprocmask");
1183
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1184
909
goto fallback;
1185
910
}
1186
1187
plugin *next_plugin = proc->next;
1188
911
free_plugin(proc);
1189
proc = next_plugin;
1190
1191
912
/* We are done modifying process list, so unblock signal */
1192
ret = (int)(TEMP_FAILURE_RETRY
1193
(sigprocmask(SIG_UNBLOCK,
1194
&sigchld_action.sa_mask, NULL)));
913
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
NULL);
1195
915
if(ret < 0){
1196
error(0, errno, "sigprocmask");
1197
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1198
918
goto fallback;
1199
919
}
1200
920
1201
921
if(plugin_list == NULL){
1202
922
break;
1203
923
}
1204
1205
924
continue;
1206
925
}
1207
926
1208
927
/* This process exited nicely, so print its buffer */
1209
928
1210
929
bool bret = print_out_password(proc->buffer,
1211
930
proc->buffer_length);
1212
931
if(not bret){
1213
error(0, errno, "print_out_password");
1214
exitstatus = EX_IOERR;
932
perror("print_out_password");
933
exitstatus = EXIT_FAILURE;
1215
934
}
1216
935
goto fallback;
1217
936
}
1219
938
/* This process has not completed. Does it have any output? */
1220
939
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1221
940
/* This process had nothing to say at this time */
1222
proc = proc->next;
1223
941
continue;
1224
942
}
1225
943
/* Before reading, make the process' data buffer large enough */
1226
944
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1227
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1228
+ (size_t) BUFFER_SIZE);
1229
if(new_buffer == NULL){
1230
error(0, errno, "malloc");
1231
exitstatus = EX_OSERR;
945
proc->buffer = realloc(proc->buffer, proc->buffer_size
946
+ (size_t) BUFFER_SIZE);
947
if (proc->buffer == NULL){
948
perror("malloc");
949
exitstatus = EXIT_FAILURE;
1232
950
goto fallback;
1233
951
}
1234
proc->buffer = new_buffer;
1235
952
proc->buffer_size += BUFFER_SIZE;
1236
953
}
1237
954
/* Read from the process */
1238
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1239
proc->buffer
1240
+ proc->buffer_length,
1241
BUFFER_SIZE));
1242
if(sret < 0){
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
956
BUFFER_SIZE);
957
if(ret < 0){
1243
958
/* Read error from this process; ignore the error */
1244
proc = proc->next;
1245
959
continue;
1246
960
}
1247
if(sret == 0){
961
if(ret == 0){
1248
962
/* got EOF */
1249
963
proc->eof = true;
1250
964
} else {
1251
proc->buffer_length += (size_t) sret;
965
proc->buffer_length += (size_t) ret;
1252
966
}
1253
967
}
1254
968
}
1255
1256
969
970
1257
971
fallback:
1258
972
1259
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1260
and exitstatus != EX_OK)){
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1261
974
/* Fallback if all plugins failed, none are found or an error
1262
975
occured */
1263
976
bool bret;
1264
977
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1265
978
char *passwordbuffer = getpass("Password: ");
1266
size_t len = strlen(passwordbuffer);
1267
/* Strip trailing newline */
1268
if(len > 0 and passwordbuffer[len-1] == '\n'){
1269
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1270
len--;
1271
}
1272
bret = print_out_password(passwordbuffer, len);
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1273
980
if(not bret){
1274
error(0, errno, "print_out_password");
1275
exitstatus = EX_IOERR;
981
perror("print_out_password");
982
exitstatus = EXIT_FAILURE;
1276
983
}
1277
984
}
1278
985
1279
986
/* Restore old signal handler */
1280
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1281
988
if(ret == -1){
1282
error(0, errno, "sigaction");
1283
exitstatus = EX_OSERR;
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
1284
991
}
1285
992
1286
993
if(custom_argv != NULL){
1287
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1288
995
free(*arg);
1290
997
free(custom_argv);
1291
998
}
1292
999
1293
free(direntries);
1294
1295
if(dir_fd != -1){
1296
close(dir_fd);
1000
if(dir != NULL){
1001
closedir(dir);
1297
1002
}
1298
1003
1299
/* Kill the processes */
1004
/* Free the process list and kill the processes */
1300
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1301
1006
if(p->pid != 0){
1302
1007
close(p->fd);
1303
1008
ret = kill(p->pid, SIGTERM);
1304
1009
if(ret == -1 and errno != ESRCH){
1305
1010
/* Set-uid proccesses might not get closed */
1306
error(0, errno, "kill");
1011
perror("kill");
1307
1012
}
1308
1013
}
1309
1014
}
1310
1015
1311
1016
/* Wait for any remaining child processes to terminate */
1312
do {
1017
do{
1313
1018
ret = wait(NULL);
1314
1019
} while(ret >= 0);
1315
1020
if(errno != ECHILD){
1316
error(0, errno, "wait");
1021
perror("wait");
1317
1022
}
1318
1023
1319
1024
free_plugin_list();
1320
1025
1321
1026
free(plugindir);
1322
free(pluginhelperdir);
1323
1027
free(argfile);
1324
1028
1325
1029
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0