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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:53:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901165317-77dccp81zyqimt2j
* plugin-runner.c (add_environment): Override existing environment
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
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(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
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
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
196
156
/* Malloc check */
197
if(new_array == NULL){
157
if(*array == NULL){
198
158
return false;
199
159
}
200
*array = new_array;
201
160
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
206
162
if(copy == NULL){
207
163
return false;
208
164
}
215
171
}
216
172
217
173
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
174
static bool add_argument(plugin *p, const char *arg){
220
175
if(p == NULL){
221
176
return false;
224
179
}
225
180
226
181
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
182
static bool add_environment(plugin *p, const char *def, bool replace){
229
183
if(p == NULL){
230
184
return false;
232
186
/* namelen = length of name of environment variable */
233
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
188
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
237
191
/* It already exists */
238
192
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
244
195
return false;
245
196
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
248
199
}
249
200
return true;
250
201
}
252
203
return add_to_char_array(def, &(p->environ), &(p->envc));
253
204
}
254
205
255
#ifndef O_CLOEXEC
256
206
/*
257
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
208
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
210
*/
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
264
214
/* If reading the flags failed, return error indication now. */
265
215
if(ret < 0){
266
216
return ret;
267
217
}
268
218
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
220
}
272
#endif /* not O_CLOEXEC */
273
221
274
222
275
223
/* Mark processes as completed when they exit, and save their exit
276
224
status. */
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
279
226
while(true){
280
227
plugin *proc = plugin_list;
281
228
int status;
285
232
break;
286
233
}
287
234
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
235
if (errno != ECHILD){
236
perror("waitpid");
291
237
}
292
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
293
240
}
294
241
295
242
/* A child exited, find it in process_list */
296
243
while(proc != NULL and proc->pid != pid){
297
244
proc = proc->next;
301
248
continue;
302
249
}
303
250
proc->status = status;
304
proc->completed = 1;
251
proc->completed = true;
305
252
}
306
errno = old_errno;
307
253
}
308
254
309
255
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
312
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
313
261
for(size_t written = 0; written < length; written += (size_t)ret){
314
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
315
263
length - written));
321
269
}
322
270
323
271
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
272
static void free_plugin(plugin *plugin_node){
326
273
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
275
free(*arg);
329
276
}
330
free(plugin_node->name);
331
277
free(plugin_node->argv);
332
278
for(char **env = plugin_node->environ; *env != NULL; env++){
333
279
free(*env);
334
280
}
335
281
free(plugin_node->environ);
336
282
free(plugin_node->buffer);
337
283
338
284
/* Removes the plugin from the singly-linked list */
339
285
if(plugin_node == plugin_list){
340
286
/* First one - simple */
360
306
361
307
int main(int argc, char *argv[]){
362
308
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
309
char *argfile = NULL;
365
310
FILE *conffp;
366
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
367
314
struct stat st;
368
315
fd_set rfds_all;
369
316
int ret, maxfd = 0;
370
ssize_t sret;
371
317
uid_t uid = 65534;
372
318
gid_t gid = 65534;
373
319
bool debug = false;
377
323
.sa_flags = SA_NOCLDSTOP };
378
324
char **custom_argv = NULL;
379
325
int custom_argc = 0;
380
int dir_fd = -1;
381
326
382
327
/* Establish a signal handler */
383
328
sigemptyset(&sigchld_action.sa_mask);
384
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
330
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
388
333
goto fallback;
389
334
}
390
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
336
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
394
339
goto fallback;
395
340
}
396
341
399
344
{ .name = "global-options", .key = 'g',
400
345
.arg = "OPTION[,OPTION[,...]]",
401
346
.doc = "Options passed to all plugins" },
402
{ .name = "global-env", .key = 'G',
347
{ .name = "global-env", .key = 'e',
403
348
.arg = "VAR=value",
404
349
.doc = "Environment variable passed to all plugins" },
405
350
{ .name = "options-for", .key = 'o',
406
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
407
352
.doc = "Options passed only to specified plugin" },
408
{ .name = "env-for", .key = 'E',
353
{ .name = "env-for", .key = 'f',
409
354
.arg = "PLUGIN:ENV=value",
410
355
.doc = "Environment variable passed to specified plugin" },
411
356
{ .name = "disable", .key = 'd',
412
357
.arg = "PLUGIN",
413
358
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
417
359
{ .name = "plugin-dir", .key = 128,
418
360
.arg = "DIRECTORY",
419
361
.doc = "Specify a different plugin directory", .group = 2 },
428
370
.doc = "Group ID the plugins will run as", .group = 3 },
429
371
{ .name = "debug", .key = 132,
430
372
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
444
373
{ .name = NULL }
445
374
};
446
375
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
380
switch (key) {
453
381
case 'g': /* --global-options */
382
if (arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
454
399
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
467
407
}
468
408
break;
469
409
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
410
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
413
break;
414
}
415
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
417
break;
418
}
419
if(opt != NULL){
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
488
429
}
489
430
}
490
errno = 0;
491
431
}
492
432
break;
493
case 'E': /* --env-for */
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
494
437
{
495
438
char *envdef = strchr(arg, ':');
496
439
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
502
446
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
510
449
}
511
450
}
512
451
break;
513
452
case 'd': /* --disable */
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
453
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
529
459
}
530
460
break;
531
461
case 128: /* --plugin-dir */
532
free(plugindir);
533
462
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
463
if(plugindir == NULL){
464
perror("strdup");
465
}
537
466
break;
538
467
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
541
473
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
474
uid = (uid_t)strtol(arg, NULL, 10);
551
475
break;
552
476
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
477
gid = (gid_t)strtol(arg, NULL, 10);
562
478
break;
563
479
case 132: /* --debug */
564
480
debug = true;
565
481
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
break;
633
case 130: /* --userid */
634
case 131: /* --groupid */
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
case ARGP_KEY_ARG:
641
break;
642
default:
643
return ARGP_ERR_UNKNOWN;
644
}
645
return errno;
646
}
647
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
482
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
484
break;
485
case ARGP_KEY_END:
486
break;
487
default:
488
return ARGP_ERR_UNKNOWN;
489
}
490
return 0;
491
}
492
493
struct argp argp = { .options = options, .parser = parse_opt,
650
494
.args_doc = "",
651
495
.doc = "Mandos plugin runner -- Run plugins" };
652
496
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
669
goto fallback;
670
}
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
497
/* Open the configfile if available */
676
if(argfile == NULL){
498
if (argfile == NULL){
677
499
conffp = fopen(AFILE, "r");
678
500
} else {
679
501
conffp = fopen(argfile, "r");
680
}
502
}
681
503
if(conffp != NULL){
682
504
char *org_line = NULL;
683
505
char *p, *arg, *new_arg, *line;
684
506
size_t size = 0;
507
ssize_t sret;
685
508
const char whitespace_delims[] = " \r\t\f\v\n";
686
509
const char comment_delim[] = "#";
687
510
688
511
custom_argc = 1;
689
512
custom_argv = malloc(sizeof(char*) * 2);
690
513
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
693
516
goto fallback;
694
517
}
695
518
custom_argv[0] = argv[0];
696
519
custom_argv[1] = NULL;
697
520
698
521
/* for each line in the config file, strip whitespace and ignore
699
522
commented text */
700
523
while(true){
702
525
if(sret == -1){
703
526
break;
704
527
}
705
528
706
529
line = org_line;
707
530
arg = strsep(&line, comment_delim);
708
531
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
534
}
712
535
new_arg = strdup(p);
713
536
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
716
539
free(org_line);
717
540
goto fallback;
718
541
}
719
542
720
543
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
744
551
}
745
552
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
553
custom_argv[custom_argc] = NULL;
747
554
}
748
555
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
556
free(org_line);
758
557
} else {
759
558
/* Check for harmful errors and go to fallback. Other errors might
760
559
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
764
563
goto fallback;
765
564
}
766
565
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
769
568
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
784
574
goto fallback;
785
575
}
786
576
}
787
577
788
578
/* Parse actual command line arguments, to let them override the
789
579
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
823
585
}
824
586
825
587
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
589
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
590
p->name ? p->name : "Global", p->argc - 1);
829
591
for(char **a = p->argv; *a != NULL; a++){
830
592
fprintf(stderr, "\tArg: %s\n", *a);
831
593
}
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
595
for(char **a = p->environ; *a != NULL; a++){
834
596
fprintf(stderr, "\t%s\n", *a);
835
597
}
836
598
}
837
599
}
838
600
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
601
/* Strip permissions down to nobody */
868
602
ret = setuid(uid);
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
603
if (ret == -1){
604
perror("setuid");
605
}
606
setgid(gid);
607
if (ret == -1){
608
perror("setgid");
609
}
610
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
617
if(dir == NULL){
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
622
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
874
624
{
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
625
int dir_fd = dirfd(dir);
626
if(dir_fd >= 0){
627
ret = set_cloexec_flag(dir_fd);
628
if(ret < 0){
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
919
632
}
920
633
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
931
634
}
932
635
933
636
FD_ZERO(&rfds_all);
934
637
935
638
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
639
while(true){
640
dirst = readdir(dir);
641
642
/* All directory entries have been processed */
643
if(dirst == NULL){
644
if (errno == EBADF){
645
perror("readdir");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
break;
650
}
651
652
d_name_len = strlen(dirst->d_name);
653
654
/* Ignore dotfiles, backup files and other junk */
655
{
656
bool bad_name = false;
657
658
const char const *bad_prefixes[] = { ".", "#", NULL };
659
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
661
".dpkg-old",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
667
if(debug){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
670
}
671
bad_name = true;
672
break;
673
}
674
}
675
if(bad_name){
676
continue;
677
}
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
682
== 0)){
683
if(debug){
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
686
}
687
bad_name = true;
688
break;
689
}
690
}
691
692
if(bad_name){
693
continue;
694
}
695
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
701
continue;
702
}
703
704
ret = stat(filename, &st);
705
if (ret == -1){
706
perror("stat");
707
free(filename);
708
continue;
709
}
710
952
711
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
956
713
if(debug){
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" with bad type or mode\n", filename);
961
716
}
962
close(plugin_fd);
963
free(direntries[i]);
717
free(filename);
964
718
continue;
965
719
}
966
720
967
plugin *p = getplugin(direntries[i]->d_name);
721
plugin *p = getplugin(dirst->d_name);
968
722
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
723
perror("getplugin");
724
free(filename);
972
725
continue;
973
726
}
974
727
if(p->disabled){
975
728
if(debug){
976
729
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
730
dirst->d_name);
978
731
}
979
close(plugin_fd);
980
free(direntries[i]);
732
free(filename);
981
733
continue;
982
734
}
983
735
{
986
738
if(g != NULL){
987
739
for(char **a = g->argv + 1; *a != NULL; a++){
988
740
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
741
perror("add_argument");
990
742
}
991
743
}
992
744
/* Add global environment variables */
993
745
for(char **e = g->environ; *e != NULL; e++){
994
746
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
747
perror("add_environment");
996
748
}
997
749
}
998
750
}
999
751
}
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
1002
755
if(p->environ[0] != NULL){
1003
756
for(char **e = environ; *e != NULL; e++){
1004
757
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
758
perror("add_environment");
1006
759
}
1007
760
}
1008
761
}
1009
762
1010
763
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
764
ret = pipe(pipefd);
765
if (ret == -1){
766
perror("pipe");
767
exitstatus = EXIT_FAILURE;
768
goto fallback;
769
}
1032
770
/* Ask OS to automatic close the pipe on exec */
1033
771
ret = set_cloexec_flag(pipefd[0]);
1034
772
if(ret < 0){
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
1040
775
goto fallback;
1041
776
}
1042
777
ret = set_cloexec_flag(pipefd[1]);
1043
778
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
779
perror("set_cloexec_flag");
780
exitstatus = EXIT_FAILURE;
1049
781
goto fallback;
1050
782
}
1051
#endif /* not O_CLOEXEC */
1052
783
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1056
785
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
1060
788
goto fallback;
1061
789
}
1062
790
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
791
pid_t pid = fork();
1067
792
if(pid == -1){
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
793
perror("fork");
794
exitstatus = EXIT_FAILURE;
1075
795
goto fallback;
1076
796
}
1077
797
if(pid == 0){
1078
798
/* this is the child process */
1079
799
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
800
if(ret < 0){
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
801
perror("sigaction");
802
_exit(EXIT_FAILURE);
1083
803
}
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
805
if(ret < 0){
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
806
perror("sigprocmask");
807
_exit(EXIT_FAILURE);
1088
808
}
1089
809
1090
810
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
811
if(ret == -1){
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
812
perror("dup2");
813
_exit(EXIT_FAILURE);
1094
814
}
1095
815
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
816
if(dirfd(dir) < 0){
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
819
closedir(dir);
820
}
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
1102
831
}
1103
832
/* no return */
1104
833
}
1105
834
/* Parent process */
1106
835
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
836
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
841
if(ret < 0){
1115
error(0, errno, "sigprocmask");
842
perror("sigprocmask");
1116
843
}
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
844
exitstatus = EXIT_FAILURE;
1119
845
goto fallback;
1120
846
}
1121
free(direntries[i]);
1122
847
1123
848
new_plugin->pid = pid;
1124
849
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
850
1131
851
/* Unblock SIGCHLD so signal handler can be run if this process
1132
852
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1136
854
if(ret < 0){
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
1139
857
goto fallback;
1140
858
}
1141
859
1142
860
FD_SET(new_plugin->fd, &rfds_all);
1143
861
1144
if(maxfd < new_plugin->fd){
862
if (maxfd < new_plugin->fd){
1145
863
maxfd = new_plugin->fd;
1146
864
}
865
1147
866
}
1148
867
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
868
closedir(dir);
869
dir = NULL;
870
1155
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
872
if(p->pid != 0){
1157
873
break;
1162
878
free_plugin_list();
1163
879
}
1164
880
}
1165
881
1166
882
/* Main loop while running plugins exist */
1167
883
while(plugin_list){
1168
884
fd_set rfds = rfds_all;
1169
885
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
886
if (select_ret == -1){
887
perror("select");
888
exitstatus = EXIT_FAILURE;
1173
889
goto fallback;
1174
890
}
1175
891
/* OK, now either a process completed, or something can be read
1176
892
from one of them */
1177
for(plugin *proc = plugin_list; proc != NULL;){
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1178
894
/* Is this process completely done? */
1179
if(proc->completed and proc->eof){
895
if(proc->eof and proc->completed){
1180
896
/* Only accept the plugin output if it exited cleanly */
1181
897
if(not WIFEXITED(proc->status)
1182
898
or WEXITSTATUS(proc->status) != 0){
1183
899
/* Bad exit by plugin */
1184
900
1185
901
if(debug){
1186
902
if(WIFEXITED(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
1190
905
WEXITSTATUS(proc->status));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
910
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(unsigned int) (proc->pid));
1197
913
}
1198
914
}
1199
915
1200
916
/* Remove the plugin */
1201
917
FD_CLR(proc->fd, &rfds_all);
1202
918
1203
919
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1208
921
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1211
924
goto fallback;
1212
925
}
1213
1214
plugin *next_plugin = proc->next;
1215
926
free_plugin(proc);
1216
proc = next_plugin;
1217
1218
927
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
NULL);
1222
930
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
1225
933
goto fallback;
1226
934
}
1227
935
1228
936
if(plugin_list == NULL){
1229
937
break;
1230
938
}
1231
1232
939
continue;
1233
940
}
1234
941
1235
942
/* This process exited nicely, so print its buffer */
1236
943
1237
944
bool bret = print_out_password(proc->buffer,
1238
945
proc->buffer_length);
1239
946
if(not bret){
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
1242
949
}
1243
950
goto fallback;
1244
951
}
1246
953
/* This process has not completed. Does it have any output? */
1247
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1248
955
/* This process had nothing to say at this time */
1249
proc = proc->next;
1250
956
continue;
1251
957
}
1252
958
/* Before reading, make the process' data buffer large enough */
1253
959
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
963
perror("malloc");
964
exitstatus = EXIT_FAILURE;
1259
965
goto fallback;
1260
966
}
1261
proc->buffer = new_buffer;
1262
967
proc->buffer_size += BUFFER_SIZE;
1263
968
}
1264
969
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
971
BUFFER_SIZE);
972
if(ret < 0){
1270
973
/* Read error from this process; ignore the error */
1271
proc = proc->next;
1272
974
continue;
1273
975
}
1274
if(sret == 0){
976
if(ret == 0){
1275
977
/* got EOF */
1276
978
proc->eof = true;
1277
979
} else {
1278
proc->buffer_length += (size_t) sret;
980
proc->buffer_length += (size_t) ret;
1279
981
}
1280
982
}
1281
983
}
1282
1283
984
985
1284
986
fallback:
1285
987
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1288
989
/* Fallback if all plugins failed, none are found or an error
1289
990
occured */
1290
991
bool bret;
1291
992
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1292
993
char *passwordbuffer = getpass("Password: ");
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
994
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1300
995
if(not bret){
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1303
998
}
1304
999
}
1305
1000
1306
1001
/* Restore old signal handler */
1307
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
1003
if(ret == -1){
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1311
1006
}
1312
1007
1313
1008
if(custom_argv != NULL){
1314
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1315
1010
free(*arg);
1317
1012
free(custom_argv);
1318
1013
}
1319
1014
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1015
if(dir != NULL){
1016
closedir(dir);
1324
1017
}
1325
1018
1326
/* Kill the processes */
1019
/* Free the process list and kill the processes */
1327
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1328
1021
if(p->pid != 0){
1329
1022
close(p->fd);
1330
1023
ret = kill(p->pid, SIGTERM);
1331
1024
if(ret == -1 and errno != ESRCH){
1332
1025
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1026
perror("kill");
1334
1027
}
1335
1028
}
1336
1029
}
1337
1030
1338
1031
/* Wait for any remaining child processes to terminate */
1339
do {
1032
do{
1340
1033
ret = wait(NULL);
1341
1034
} while(ret >= 0);
1342
1035
if(errno != ECHILD){
1343
error(0, errno, "wait");
1036
perror("wait");
1344
1037
}
1345
1038
1346
1039
free_plugin_list();
1347
1040
1348
1041
free(plugindir);
1349
free(pluginhelperdir);
1350
1042
free(argfile);
1351
1043
1352
1044
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0