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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:19:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901161932-ostp7tulh9aijulh
* plugin-runner.c (add_environment): Never insert existing environment
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
variables.
(main): Rename "--global-envs" to "--global-env" and "--envs-for" to
"--env-for".
* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
"--global-env" and "--envs-for" to
"--env-for".
(OPTIONS): Added "--global-env" and "--env-for".
(FALLBACK): Add id attribute.
(EXIT STATUS): Add text.
(ENVIRONMENT): New section.
(FILES): Document configuration file.
- 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
135
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
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;
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
186
/* namelen = length of name of environment variable */
222
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
188
/* 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
}
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* Refuse to add an existing variable */
238
192
return true;
239
193
}
240
194
}
241
195
return add_to_char_array(def, &(p->environ), &(p->envc));
242
196
}
243
197
244
#ifndef O_CLOEXEC
245
198
/*
246
199
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
200
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
201
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
202
*/
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));
203
static int set_cloexec_flag(int fd)
204
{
205
int ret = fcntl(fd, F_GETFD, 0);
253
206
/* If reading the flags failed, return error indication now. */
254
207
if(ret < 0){
255
208
return ret;
256
209
}
257
210
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
211
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
212
}
261
#endif /* not O_CLOEXEC */
262
213
263
214
264
215
/* Mark processes as completed when they exit, and save their exit
265
216
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
217
void handle_sigchld(__attribute__((unused)) int sig){
268
218
while(true){
269
219
plugin *proc = plugin_list;
270
220
int status;
274
224
break;
275
225
}
276
226
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
227
if (errno != ECHILD){
228
perror("waitpid");
280
229
}
281
error(0, errno, "waitpid");
230
/* No child processes */
231
break;
282
232
}
283
233
284
234
/* A child exited, find it in process_list */
285
235
while(proc != NULL and proc->pid != pid){
286
236
proc = proc->next;
290
240
continue;
291
241
}
292
242
proc->status = status;
293
proc->completed = 1;
243
proc->completed = true;
294
244
}
295
errno = old_errno;
296
245
}
297
246
298
247
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
248
bool print_out_password(const char *buffer, size_t length){
301
249
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
302
253
for(size_t written = 0; written < length; written += (size_t)ret){
303
254
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
255
length - written));
310
261
}
311
262
312
263
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
264
static void free_plugin(plugin *plugin_node){
315
265
316
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
322
272
}
323
273
free(plugin_node->environ);
324
274
free(plugin_node->buffer);
325
275
326
276
/* Removes the plugin from the singly-linked list */
327
277
if(plugin_node == plugin_list){
328
278
/* First one - simple */
348
298
349
299
int main(int argc, char *argv[]){
350
300
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
301
char *argfile = NULL;
353
302
FILE *conffp;
354
struct dirent **direntries = NULL;
303
size_t d_name_len;
304
DIR *dir = NULL;
305
struct dirent *dirst;
355
306
struct stat st;
356
307
fd_set rfds_all;
357
308
int ret, maxfd = 0;
358
ssize_t sret;
359
309
uid_t uid = 65534;
360
310
gid_t gid = 65534;
361
311
bool debug = false;
365
315
.sa_flags = SA_NOCLDSTOP };
366
316
char **custom_argv = NULL;
367
317
int custom_argc = 0;
368
int dir_fd = -1;
369
318
370
319
/* Establish a signal handler */
371
320
sigemptyset(&sigchld_action.sa_mask);
372
321
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
322
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
323
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
376
325
goto fallback;
377
326
}
378
327
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
328
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
329
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
382
331
goto fallback;
383
332
}
384
333
387
336
{ .name = "global-options", .key = 'g',
388
337
.arg = "OPTION[,OPTION[,...]]",
389
338
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
339
{ .name = "global-env", .key = 'e',
391
340
.arg = "VAR=value",
392
341
.doc = "Environment variable passed to all plugins" },
393
342
{ .name = "options-for", .key = 'o',
394
343
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
344
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
345
{ .name = "env-for", .key = 'f',
397
346
.arg = "PLUGIN:ENV=value",
398
347
.doc = "Environment variable passed to specified plugin" },
399
348
{ .name = "disable", .key = 'd',
400
349
.arg = "PLUGIN",
401
350
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
351
{ .name = "plugin-dir", .key = 128,
406
352
.arg = "DIRECTORY",
407
353
.doc = "Specify a different plugin directory", .group = 2 },
416
362
.doc = "Group ID the plugins will run as", .group = 3 },
417
363
{ .name = "debug", .key = 132,
418
364
.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
365
{ .name = NULL }
433
366
};
434
367
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;
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
370
/* Get the INPUT argument from `argp_parse', which we know is a
371
pointer to our plugin list pointer. */
372
switch (key) {
441
373
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
442
391
{
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;
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
455
399
}
456
400
break;
457
401
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;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
476
421
}
477
422
}
478
errno = 0;
479
423
}
480
424
break;
481
case 'E': /* --env-for */
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
482
429
{
483
430
char *envdef = strchr(arg, ':');
484
431
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
490
438
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;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
498
441
}
499
442
}
500
443
break;
501
444
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
}
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
517
451
}
518
452
break;
519
453
case 128: /* --plugin-dir */
520
free(plugindir);
521
454
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
455
if(plugindir == NULL){
456
perror("strdup");
457
}
525
458
break;
526
459
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
460
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
529
465
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;
466
uid = (uid_t)strtol(arg, NULL, 10);
539
467
break;
540
468
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;
469
gid = (gid_t)strtol(arg, NULL, 10);
550
470
break;
551
471
case 132: /* --debug */
552
472
debug = true;
553
473
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
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
/* FALLTHROUGH */
587
default:
588
return ARGP_ERR_UNKNOWN;
589
}
590
return errno; /* Set to 0 at start */
591
}
592
593
/* This option parser is the same as parse_opt() above, except it
594
ignores everything but the --config-file option. */
595
error_t parse_opt_config_file(int key, char *arg,
596
__attribute__((unused))
597
struct argp_state *state){
598
errno = 0;
599
switch(key){
600
case 'g': /* --global-options */
601
case 'G': /* --global-env */
602
case 'o': /* --options-for */
603
case 'E': /* --env-for */
604
case 'd': /* --disable */
605
case 'e': /* --enable */
606
case 128: /* --plugin-dir */
607
break;
608
case 129: /* --config-file */
609
free(argfile);
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
614
break;
615
case 130: /* --userid */
616
case 131: /* --groupid */
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
619
case '?': /* --help */
620
case -3: /* --usage */
621
case 'V': /* --version */
622
case ARGP_KEY_ARG:
623
break;
624
default:
625
return ARGP_ERR_UNKNOWN;
626
}
627
return errno;
628
}
629
630
struct argp argp = { .options = options,
631
.parser = parse_opt_config_file,
632
.args_doc = "",
474
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
476
break;
477
case ARGP_KEY_END:
478
break;
479
default:
480
return ARGP_ERR_UNKNOWN;
481
}
482
return 0;
483
}
484
485
struct argp argp = { .options = options, .parser = parse_opt,
486
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
633
487
.doc = "Mandos plugin runner -- Run plugins" };
634
488
635
/* Parse using parse_opt_config_file() in order to get the custom
636
config file location, if any. */
637
ret = argp_parse(&argp, argc, argv,
638
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
639
NULL, NULL);
640
switch(ret){
641
case 0:
642
break;
643
case ENOMEM:
644
default:
645
errno = ret;
646
error(0, errno, "argp_parse");
647
exitstatus = EX_OSERR;
648
goto fallback;
649
case EINVAL:
650
exitstatus = EX_USAGE;
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
490
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
492
exitstatus = EXIT_FAILURE;
651
493
goto fallback;
652
494
}
653
654
/* Reset to the normal argument parser */
655
argp.parser = parse_opt;
656
657
/* Open the configfile if available */
658
if(argfile == NULL){
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
659
498
conffp = fopen(AFILE, "r");
660
499
} else {
661
500
conffp = fopen(argfile, "r");
662
}
501
}
663
502
if(conffp != NULL){
664
503
char *org_line = NULL;
665
504
char *p, *arg, *new_arg, *line;
666
505
size_t size = 0;
506
ssize_t sret;
667
507
const char whitespace_delims[] = " \r\t\f\v\n";
668
508
const char comment_delim[] = "#";
669
509
670
510
custom_argc = 1;
671
511
custom_argv = malloc(sizeof(char*) * 2);
672
512
if(custom_argv == NULL){
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
513
perror("malloc");
514
exitstatus = EXIT_FAILURE;
675
515
goto fallback;
676
516
}
677
517
custom_argv[0] = argv[0];
678
518
custom_argv[1] = NULL;
679
519
680
520
/* for each line in the config file, strip whitespace and ignore
681
521
commented text */
682
522
while(true){
684
524
if(sret == -1){
685
525
break;
686
526
}
687
527
688
528
line = org_line;
689
529
arg = strsep(&line, comment_delim);
690
530
while((p = strsep(&arg, whitespace_delims)) != NULL){
693
533
}
694
534
new_arg = strdup(p);
695
535
if(new_arg == NULL){
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
698
538
free(org_line);
699
539
goto fallback;
700
540
}
701
541
702
542
custom_argc += 1;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
715
550
}
716
551
custom_argv[custom_argc-1] = new_arg;
717
custom_argv[custom_argc] = NULL;
552
custom_argv[custom_argc] = NULL;
718
553
}
719
554
}
720
do {
721
ret = fclose(conffp);
722
} while(ret == EOF and errno == EINTR);
723
if(ret == EOF){
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
726
goto fallback;
727
}
728
555
free(org_line);
729
} else {
556
} else{
730
557
/* Check for harmful errors and go to fallback. Other errors might
731
558
not affect opening plugins */
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
735
562
goto fallback;
736
563
}
737
564
}
738
/* If there were any arguments from the configuration file, pass
739
them to parser as command line arguments */
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
740
567
if(custom_argv != NULL){
741
ret = argp_parse(&argp, custom_argc, custom_argv,
742
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
743
NULL, NULL);
744
switch(ret){
745
case 0:
746
break;
747
case ENOMEM:
748
default:
749
errno = ret;
750
error(0, errno, "argp_parse");
751
exitstatus = EX_OSERR;
752
goto fallback;
753
case EINVAL:
754
exitstatus = EX_CONFIG;
755
goto fallback;
756
}
757
}
758
759
/* Parse actual command line arguments, to let them override the
760
config file */
761
ret = argp_parse(&argp, argc, argv,
762
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
763
NULL, NULL);
764
switch(ret){
765
case 0:
766
break;
767
case ENOMEM:
768
default:
769
errno = ret;
770
error(0, errno, "argp_parse");
771
exitstatus = EX_OSERR;
772
goto fallback;
773
case EINVAL:
774
exitstatus = EX_USAGE;
775
goto fallback;
776
}
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
569
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
571
exitstatus = EXIT_FAILURE;
572
goto fallback;
793
573
}
794
574
}
795
575
796
576
if(debug){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
577
for(plugin *p = plugin_list; p != NULL; p=p->next){
798
578
fprintf(stderr, "Plugin: %s has %d arguments\n",
799
579
p->name ? p->name : "Global", p->argc - 1);
800
580
for(char **a = p->argv; *a != NULL; a++){
801
581
fprintf(stderr, "\tArg: %s\n", *a);
802
582
}
803
fprintf(stderr, "...and %d environment variables\n", p->envc);
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
804
584
for(char **a = p->environ; *a != NULL; a++){
805
585
fprintf(stderr, "\t%s\n", *a);
806
586
}
807
587
}
808
588
}
809
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
836
if(ret == -1){
837
error(0, errno, "setgid");
838
}
589
590
/* Strip permissions down to nobody */
839
591
ret = setuid(uid);
840
if(ret == -1){
841
error(0, errno, "setuid");
842
}
843
844
/* Open plugin directory with close_on_exec flag */
592
if (ret == -1){
593
perror("setuid");
594
}
595
setgid(gid);
596
if (ret == -1){
597
perror("setgid");
598
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
606
if(dir == NULL){
607
perror("Could not open plugin dir");
608
exitstatus = EXIT_FAILURE;
609
goto fallback;
610
}
611
612
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
613
{
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
853
if(dir_fd == -1){
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
856
goto fallback;
857
}
858
859
#ifndef O_CLOEXEC
860
/* Set the FD_CLOEXEC flag on the directory */
861
ret = set_cloexec_flag(dir_fd);
862
if(ret < 0){
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
865
goto fallback;
866
}
867
#endif /* O_CLOEXEC */
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
614
int dir_fd = dirfd(dir);
615
if(dir_fd >= 0){
616
ret = set_cloexec_flag(dir_fd);
617
if(ret < 0){
618
perror("set_cloexec_flag");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
890
621
}
891
622
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
902
623
}
903
624
904
625
FD_ZERO(&rfds_all);
905
626
906
627
/* Read and execute any executable in the plugin directory*/
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
913
continue;
914
}
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
916
if(ret == -1){
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
920
continue;
921
}
922
628
while(true){
629
dirst = readdir(dir);
630
631
// All directory entries have been processed
632
if(dirst == NULL){
633
if (errno == EBADF){
634
perror("readdir");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
break;
639
}
640
641
d_name_len = strlen(dirst->d_name);
642
643
// Ignore dotfiles, backup files and other junk
644
{
645
bool bad_name = false;
646
647
const char const *bad_prefixes[] = { ".", "#", NULL };
648
649
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
650
".dpkg-old",
651
".dpkg-divert", NULL };
652
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
653
size_t pre_len = strlen(*pre);
654
if((d_name_len >= pre_len)
655
and strncmp((dirst->d_name), *pre, pre_len) == 0){
656
if(debug){
657
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
658
" with bad prefix %s\n", dirst->d_name, *pre);
659
}
660
bad_name = true;
661
break;
662
}
663
}
664
if(bad_name){
665
continue;
666
}
667
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
size_t suf_len = strlen(*suf);
669
if((d_name_len >= suf_len)
670
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
671
== 0)){
672
if(debug){
673
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
674
" with bad suffix %s\n", dirst->d_name, *suf);
675
}
676
bad_name = true;
677
break;
678
}
679
}
680
681
if(bad_name){
682
continue;
683
}
684
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
691
}
692
693
ret = stat(filename, &st);
694
if (ret == -1){
695
perror("stat");
696
free(filename);
697
continue;
698
}
699
923
700
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
701
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
927
702
if(debug){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
703
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
704
" with bad type or mode\n", filename);
932
705
}
933
close(plugin_fd);
934
free(direntries[i]);
706
free(filename);
935
707
continue;
936
708
}
937
709
938
plugin *p = getplugin(direntries[i]->d_name);
710
plugin *p = getplugin(dirst->d_name);
939
711
if(p == NULL){
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
712
perror("getplugin");
713
free(filename);
943
714
continue;
944
715
}
945
716
if(p->disabled){
946
717
if(debug){
947
718
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
948
direntries[i]->d_name);
719
dirst->d_name);
949
720
}
950
close(plugin_fd);
951
free(direntries[i]);
721
free(filename);
952
722
continue;
953
723
}
954
724
{
957
727
if(g != NULL){
958
728
for(char **a = g->argv + 1; *a != NULL; a++){
959
729
if(not add_argument(p, *a)){
960
error(0, errno, "add_argument");
730
perror("add_argument");
961
731
}
962
732
}
963
733
/* Add global environment variables */
964
734
for(char **e = g->environ; *e != NULL; e++){
965
if(not add_environment(p, *e, false)){
966
error(0, errno, "add_environment");
735
if(not add_environment(p, *e)){
736
perror("add_environment");
967
737
}
968
738
}
969
739
}
970
740
}
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
973
744
if(p->environ[0] != NULL){
974
745
for(char **e = environ; *e != NULL; e++){
975
if(not add_environment(p, *e, false)){
976
error(0, errno, "add_environment");
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
977
753
}
978
754
}
979
755
}
980
756
981
757
int pipefd[2];
982
#ifndef O_CLOEXEC
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
987
if(ret == -1){
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
758
ret = pipe(pipefd);
759
if (ret == -1){
760
perror("pipe");
761
exitstatus = EXIT_FAILURE;
762
goto fallback;
763
}
1003
764
/* Ask OS to automatic close the pipe on exec */
1004
765
ret = set_cloexec_flag(pipefd[0]);
1005
766
if(ret < 0){
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
767
perror("set_cloexec_flag");
768
exitstatus = EXIT_FAILURE;
1011
769
goto fallback;
1012
770
}
1013
771
ret = set_cloexec_flag(pipefd[1]);
1014
772
if(ret < 0){
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1020
775
goto fallback;
1021
776
}
1022
#endif /* not O_CLOEXEC */
1023
777
/* Block SIGCHLD until process is safely in process list */
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1025
&sigchld_action.sa_mask,
1026
NULL));
778
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1027
779
if(ret < 0){
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1031
782
goto fallback;
1032
783
}
1033
/* Starting a new process to be watched */
1034
pid_t pid;
1035
do {
1036
pid = fork();
1037
} while(pid == -1 and errno == EINTR);
784
// Starting a new process to be watched
785
pid_t pid = fork();
1038
786
if(pid == -1){
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
1046
789
goto fallback;
1047
790
}
1048
791
if(pid == 0){
1049
792
/* this is the child process */
1050
793
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
794
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
795
perror("sigaction");
796
_exit(EXIT_FAILURE);
1054
797
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
798
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
799
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
800
perror("sigprocmask");
801
_exit(EXIT_FAILURE);
1059
802
}
1060
803
1061
804
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
805
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
806
perror("dup2");
807
_exit(EXIT_FAILURE);
1065
808
}
1066
809
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
810
if(dirfd(dir) < 0){
811
/* If dir has no file descriptor, we could not set FD_CLOEXEC
812
above and must now close it manually here. */
813
closedir(dir);
814
}
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
1073
825
}
1074
826
/* no return */
1075
827
}
1076
828
/* Parent process */
1077
829
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1080
if(new_plugin == NULL){
1081
error(0, errno, "getplugin");
1082
ret = (int)(TEMP_FAILURE_RETRY
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1084
NULL)));
830
free(filename);
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
834
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
835
if(ret < 0){
1086
error(0, errno, "sigprocmask");
836
perror("sigprocmask");
1087
837
}
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
838
exitstatus = EXIT_FAILURE;
1090
839
goto fallback;
1091
840
}
1092
free(direntries[i]);
1093
841
1094
842
new_plugin->pid = pid;
1095
843
new_plugin->fd = pipefd[0];
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
844
1102
845
/* Unblock SIGCHLD so signal handler can be run if this process
1103
846
has already completed */
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1105
&sigchld_action.sa_mask,
1106
NULL));
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1107
848
if(ret < 0){
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
1110
851
goto fallback;
1111
852
}
1112
853
1113
854
FD_SET(new_plugin->fd, &rfds_all);
1114
855
1115
if(maxfd < new_plugin->fd){
856
if (maxfd < new_plugin->fd){
1116
857
maxfd = new_plugin->fd;
1117
858
}
859
1118
860
}
1119
861
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1124
free_plugin(getplugin(NULL));
1125
862
closedir(dir);
863
dir = NULL;
864
1126
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
1127
866
if(p->pid != 0){
1128
867
break;
1133
872
free_plugin_list();
1134
873
}
1135
874
}
1136
875
1137
876
/* Main loop while running plugins exist */
1138
877
while(plugin_list){
1139
878
fd_set rfds = rfds_all;
1140
879
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1141
if(select_ret == -1 and errno != EINTR){
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
880
if (select_ret == -1){
881
perror("select");
882
exitstatus = EXIT_FAILURE;
1144
883
goto fallback;
1145
884
}
1146
885
/* OK, now either a process completed, or something can be read
1147
886
from one of them */
1148
for(plugin *proc = plugin_list; proc != NULL;){
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1149
888
/* Is this process completely done? */
1150
if(proc->completed and proc->eof){
889
if(proc->eof and proc->completed){
1151
890
/* Only accept the plugin output if it exited cleanly */
1152
891
if(not WIFEXITED(proc->status)
1153
892
or WEXITSTATUS(proc->status) != 0){
1154
893
/* Bad exit by plugin */
1155
894
1156
895
if(debug){
1157
896
if(WIFEXITED(proc->status)){
1158
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1159
" status %d\n", proc->name,
1160
(intmax_t) (proc->pid),
897
fprintf(stderr, "Plugin %u exited with status %d\n",
898
(unsigned int) (proc->pid),
1161
899
WEXITSTATUS(proc->status));
1162
} else if(WIFSIGNALED(proc->status)){
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1164
" signal %d: %s\n", proc->name,
1165
(intmax_t) (proc->pid),
1166
WTERMSIG(proc->status),
1167
strsignal(WTERMSIG(proc->status)));
900
} else if(WIFSIGNALED(proc->status)) {
901
fprintf(stderr, "Plugin %u killed by signal %d\n",
902
(unsigned int) (proc->pid),
903
WTERMSIG(proc->status));
904
} else if(WCOREDUMP(proc->status)){
905
fprintf(stderr, "Plugin %d dumped core\n",
906
(unsigned int) (proc->pid));
1168
907
}
1169
908
}
1170
909
1171
910
/* Remove the plugin */
1172
911
FD_CLR(proc->fd, &rfds_all);
1173
912
1174
913
/* Block signal while modifying process_list */
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1176
(SIG_BLOCK,
1177
&sigchld_action.sa_mask,
1178
NULL));
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1179
915
if(ret < 0){
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1182
918
goto fallback;
1183
919
}
1184
1185
plugin *next_plugin = proc->next;
1186
920
free_plugin(proc);
1187
proc = next_plugin;
1188
1189
921
/* We are done modifying process list, so unblock signal */
1190
ret = (int)(TEMP_FAILURE_RETRY
1191
(sigprocmask(SIG_UNBLOCK,
1192
&sigchld_action.sa_mask, NULL)));
922
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
NULL);
1193
924
if(ret < 0){
1194
error(0, errno, "sigprocmask");
1195
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1196
927
goto fallback;
1197
928
}
1198
929
1199
930
if(plugin_list == NULL){
1200
931
break;
1201
932
}
1202
1203
933
continue;
1204
934
}
1205
935
1206
936
/* This process exited nicely, so print its buffer */
1207
937
1208
938
bool bret = print_out_password(proc->buffer,
1209
939
proc->buffer_length);
1210
940
if(not bret){
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
941
perror("print_out_password");
942
exitstatus = EXIT_FAILURE;
1213
943
}
1214
944
goto fallback;
1215
945
}
1217
947
/* This process has not completed. Does it have any output? */
1218
948
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1219
949
/* This process had nothing to say at this time */
1220
proc = proc->next;
1221
950
continue;
1222
951
}
1223
952
/* Before reading, make the process' data buffer large enough */
1224
953
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1229
exitstatus = EX_OSERR;
954
proc->buffer = realloc(proc->buffer, proc->buffer_size
955
+ (size_t) BUFFER_SIZE);
956
if (proc->buffer == NULL){
957
perror("malloc");
958
exitstatus = EXIT_FAILURE;
1230
959
goto fallback;
1231
960
}
1232
proc->buffer = new_buffer;
1233
961
proc->buffer_size += BUFFER_SIZE;
1234
962
}
1235
963
/* Read from the process */
1236
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1237
proc->buffer
1238
+ proc->buffer_length,
1239
BUFFER_SIZE));
1240
if(sret < 0){
964
ret = read(proc->fd, proc->buffer + proc->buffer_length,
965
BUFFER_SIZE);
966
if(ret < 0){
1241
967
/* Read error from this process; ignore the error */
1242
proc = proc->next;
1243
968
continue;
1244
969
}
1245
if(sret == 0){
970
if(ret == 0){
1246
971
/* got EOF */
1247
972
proc->eof = true;
1248
973
} else {
1249
proc->buffer_length += (size_t) sret;
974
proc->buffer_length += (size_t) ret;
1250
975
}
1251
976
}
1252
977
}
1253
1254
978
979
1255
980
fallback:
1256
981
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1259
983
/* Fallback if all plugins failed, none are found or an error
1260
984
occured */
1261
985
bool bret;
1262
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1263
987
char *passwordbuffer = getpass("Password: ");
1264
size_t len = strlen(passwordbuffer);
1265
/* Strip trailing newline */
1266
if(len > 0 and passwordbuffer[len-1] == '\n'){
1267
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1268
len--;
1269
}
1270
bret = print_out_password(passwordbuffer, len);
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
989
if(not bret){
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
1274
992
}
1275
993
}
1276
994
1277
995
/* Restore old signal handler */
1278
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1279
997
if(ret == -1){
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1282
1000
}
1283
1001
1284
1002
if(custom_argv != NULL){
1285
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1286
1004
free(*arg);
1288
1006
free(custom_argv);
1289
1007
}
1290
1008
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
1009
if(dir != NULL){
1010
closedir(dir);
1295
1011
}
1296
1012
1297
/* Kill the processes */
1013
/* Free the process list and kill the processes */
1298
1014
for(plugin *p = plugin_list; p != NULL; p = p->next){
1299
1015
if(p->pid != 0){
1300
1016
close(p->fd);
1301
1017
ret = kill(p->pid, SIGTERM);
1302
1018
if(ret == -1 and errno != ESRCH){
1303
1019
/* Set-uid proccesses might not get closed */
1304
error(0, errno, "kill");
1020
perror("kill");
1305
1021
}
1306
1022
}
1307
1023
}
1308
1024
1309
1025
/* Wait for any remaining child processes to terminate */
1310
do {
1026
do{
1311
1027
ret = wait(NULL);
1312
1028
} while(ret >= 0);
1313
1029
if(errno != ECHILD){
1314
error(0, errno, "wait");
1030
perror("wait");
1315
1031
}
1316
1032
1317
1033
free_plugin_list();
1318
1034
1319
1035
free(plugindir);
1320
free(pluginhelperdir);
1321
1036
free(argfile);
1322
1037
1323
1038
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0