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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
42
26
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
63
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
89
66
90
67
#define BUFFER_SIZE 256
91
68
92
69
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
71
96
const char *argp_program_version = "plugin-runner " VERSION;
97
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;
98
76
99
77
typedef struct plugin{
100
78
char *name; /* can be NULL or any plugin name */
103
81
char **environ;
104
82
int envc;
105
83
bool disabled;
106
84
107
85
/* Variables used for running processes*/
108
86
pid_t pid;
109
87
int fd;
111
89
size_t buffer_size;
112
90
size_t buffer_length;
113
91
bool eof;
114
volatile sig_atomic_t completed;
115
int status;
92
volatile bool completed;
93
volatile int status;
116
94
struct plugin *next;
117
95
} plugin;
118
96
119
97
static plugin *plugin_list = NULL;
120
98
121
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
122
100
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
101
static plugin *getplugin(char *name){
125
/* Check for existing plugin with that name */
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
127
if((p->name == name)
128
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))){
129
106
return p;
130
107
}
131
108
}
132
109
/* Create a new plugin */
133
plugin *new_plugin = NULL;
134
do {
135
new_plugin = malloc(sizeof(plugin));
136
} while(new_plugin == NULL and errno == EINTR);
137
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
138
112
return NULL;
139
113
}
140
114
char *copy_name = NULL;
141
115
if(name != NULL){
142
do {
143
copy_name = strdup(name);
144
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
145
117
if(copy_name == NULL){
146
int e = errno;
147
free(new_plugin);
148
errno = e;
149
118
return NULL;
150
119
}
151
120
}
152
153
*new_plugin = (plugin){ .name = copy_name,
154
.argc = 1,
155
.disabled = false,
156
.next = plugin_list };
157
158
do {
159
new_plugin->argv = malloc(sizeof(char *) * 2);
160
} while(new_plugin->argv == NULL and errno == EINTR);
161
if(new_plugin->argv == NULL){
162
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){
163
129
free(copy_name);
164
130
free(new_plugin);
165
errno = e;
166
131
return NULL;
167
132
}
168
133
new_plugin->argv[0] = copy_name;
169
134
new_plugin->argv[1] = NULL;
170
135
171
do {
172
new_plugin->environ = malloc(sizeof(char *));
173
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
174
137
if(new_plugin->environ == NULL){
175
int e = errno;
176
138
free(copy_name);
177
139
free(new_plugin->argv);
178
140
free(new_plugin);
179
errno = e;
180
141
return NULL;
181
142
}
182
143
new_plugin->environ[0] = NULL;
187
148
}
188
149
189
150
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
191
151
static bool add_to_char_array(const char *new, char ***array,
192
152
int *len){
193
153
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
210
156
/* Malloc check */
211
if(new_array == NULL){
157
if(*array == NULL){
212
158
return false;
213
159
}
214
*array = new_array;
215
160
/* Make a copy of the new string */
216
char *copy;
217
do {
218
copy = strdup(new);
219
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
220
162
if(copy == NULL){
221
163
return false;
222
164
}
229
171
}
230
172
231
173
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
174
static bool add_argument(plugin *p, const char *arg){
234
175
if(p == NULL){
235
176
return false;
238
179
}
239
180
240
181
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
182
static bool add_environment(plugin *p, const char *def, bool replace){
243
183
if(p == NULL){
244
184
return false;
246
186
/* namelen = length of name of environment variable */
247
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
188
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
251
191
/* It already exists */
252
192
if(replace){
253
char *new_envdef;
254
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
258
195
return false;
259
196
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
262
199
}
263
200
return true;
264
201
}
266
203
return add_to_char_array(def, &(p->environ), &(p->envc));
267
204
}
268
205
269
#ifndef O_CLOEXEC
270
206
/*
271
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
208
* Descriptor Flags".
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
274
210
*/
275
__attribute__((warn_unused_result))
276
static int set_cloexec_flag(int fd){
277
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);
278
214
/* If reading the flags failed, return error indication now. */
279
215
if(ret < 0){
280
216
return ret;
281
217
}
282
218
/* Store modified flag word in the descriptor. */
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
285
220
}
286
#endif /* not O_CLOEXEC */
287
221
288
222
289
223
/* Mark processes as completed when they exit, and save their exit
290
224
status. */
291
static void handle_sigchld(__attribute__((unused)) int sig){
292
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
293
226
while(true){
294
227
plugin *proc = plugin_list;
295
228
int status;
299
232
break;
300
233
}
301
234
if(pid == -1){
302
if(errno == ECHILD){
303
/* No child processes */
304
break;
235
if (errno != ECHILD){
236
perror("waitpid");
305
237
}
306
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
307
240
}
308
241
309
242
/* A child exited, find it in process_list */
310
243
while(proc != NULL and proc->pid != pid){
311
244
proc = proc->next;
315
248
continue;
316
249
}
317
250
proc->status = status;
318
proc->completed = 1;
251
proc->completed = true;
319
252
}
320
errno = old_errno;
321
253
}
322
254
323
255
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
326
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
327
261
for(size_t written = 0; written < length; written += (size_t)ret){
328
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
329
263
length - written));
335
269
}
336
270
337
271
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
272
static void free_plugin(plugin *plugin_node){
340
273
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
275
free(*arg);
343
276
}
344
free(plugin_node->name);
345
277
free(plugin_node->argv);
346
278
for(char **env = plugin_node->environ; *env != NULL; env++){
347
279
free(*env);
348
280
}
349
281
free(plugin_node->environ);
350
282
free(plugin_node->buffer);
351
283
352
284
/* Removes the plugin from the singly-linked list */
353
285
if(plugin_node == plugin_list){
354
286
/* First one - simple */
374
306
375
307
int main(int argc, char *argv[]){
376
308
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
309
char *argfile = NULL;
379
310
FILE *conffp;
380
struct dirent **direntries = NULL;
311
size_t d_name_len;
312
DIR *dir = NULL;
313
struct dirent *dirst;
381
314
struct stat st;
382
315
fd_set rfds_all;
383
316
int ret, maxfd = 0;
384
ssize_t sret;
385
317
uid_t uid = 65534;
386
318
gid_t gid = 65534;
387
319
bool debug = false;
391
323
.sa_flags = SA_NOCLDSTOP };
392
324
char **custom_argv = NULL;
393
325
int custom_argc = 0;
394
int dir_fd = -1;
395
326
396
327
/* Establish a signal handler */
397
328
sigemptyset(&sigchld_action.sa_mask);
398
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
399
330
if(ret == -1){
400
error(0, errno, "sigaddset");
401
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
402
333
goto fallback;
403
334
}
404
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
405
336
if(ret == -1){
406
error(0, errno, "sigaction");
407
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
408
339
goto fallback;
409
340
}
410
341
442
373
.doc = "Group ID the plugins will run as", .group = 3 },
443
374
{ .name = "debug", .key = 132,
444
375
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
/*
450
* These reproduce what we would get without ARGP_NO_HELP
451
*/
452
{ .name = "help", .key = '?',
453
.doc = "Give this help list", .group = -1 },
454
{ .name = "usage", .key = -3,
455
.doc = "Give a short usage message", .group = -1 },
456
{ .name = "version", .key = 'V',
457
.doc = "Print program version", .group = -1 },
458
376
{ .name = NULL }
459
377
};
460
378
461
__attribute__((nonnull(3)))
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
errno = 0;
464
switch(key){
465
char *tmp;
466
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
467
382
case 'g': /* --global-options */
468
{
469
char *plugin_option;
470
while((plugin_option = strsep(&arg, ",")) != NULL){
471
if(not add_argument(getplugin(NULL), plugin_option)){
472
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
473
392
}
474
393
}
475
errno = 0;
476
394
}
477
395
break;
478
396
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
481
408
}
482
409
break;
483
410
case 'o': /* --options-for */
484
{
485
char *option_list = strchr(arg, ':');
486
if(option_list == NULL){
487
argp_error(state, "No colon in \"%s\"", arg);
488
errno = EINVAL;
489
break;
490
}
491
*option_list = '\0';
492
option_list++;
493
if(arg[0] == '\0'){
494
argp_error(state, "Empty plugin name");
495
errno = EINVAL;
496
break;
497
}
498
char *option;
499
while((option = strsep(&option_list, ",")) != NULL){
500
if(not add_argument(getplugin(arg), option)){
501
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
502
430
}
503
431
}
504
errno = 0;
505
432
}
506
433
break;
507
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
508
438
{
509
439
char *envdef = strchr(arg, ':');
510
440
if(envdef == NULL){
511
argp_error(state, "No colon in \"%s\"", arg);
512
errno = EINVAL;
513
break;
514
}
515
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
516
447
envdef++;
517
if(arg[0] == '\0'){
518
argp_error(state, "Empty plugin name");
519
errno = EINVAL;
520
break;
521
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
524
450
}
525
451
}
526
452
break;
527
453
case 'd': /* --disable */
528
{
454
if (arg != NULL){
529
455
plugin *p = getplugin(arg);
530
if(p != NULL){
531
p->disabled = true;
532
errno = 0;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
533
458
}
459
p->disabled = true;
534
460
}
535
461
break;
536
462
case 'e': /* --enable */
537
{
463
if (arg != NULL){
538
464
plugin *p = getplugin(arg);
539
if(p != NULL){
540
p->disabled = false;
541
errno = 0;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
542
467
}
468
p->disabled = false;
543
469
}
544
470
break;
545
471
case 128: /* --plugin-dir */
546
free(plugindir);
547
472
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
473
if(plugindir == NULL){
474
perror("strdup");
475
}
551
476
break;
552
477
case 129: /* --config-file */
553
478
/* This is already done by parse_opt_config_file() */
554
479
break;
555
480
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
557
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
559
argp_error(state, "Bad user ID number: \"%s\", using %"
560
PRIdMAX, arg, (intmax_t)uid);
561
break;
562
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
481
uid = (uid_t)strtol(arg, NULL, 10);
565
482
break;
566
483
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
568
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
570
argp_error(state, "Bad group ID number: \"%s\", using %"
571
PRIdMAX, arg, (intmax_t)gid);
572
break;
573
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
484
gid = (gid_t)strtol(arg, NULL, 10);
576
485
break;
577
486
case 132: /* --debug */
578
487
debug = true;
579
488
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
/*
588
* These reproduce what we would get without ARGP_NO_HELP
589
*/
590
case '?': /* --help */
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
case -3: /* --usage */
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
argp_state_help(state, state->out_stream,
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
case 'V': /* --version */
600
fprintf(state->out_stream, "%s\n", argp_program_version);
601
exit(EXIT_SUCCESS);
602
break;
603
/*
604
* When adding more options before this line, remember to also add a
605
* "case" to the "parse_opt_config_file" function below.
606
*/
607
489
case ARGP_KEY_ARG:
608
/* Cryptsetup always passes an argument, which is an empty
609
string if "none" was specified in /etc/crypttab. So if
610
argument was empty, we ignore it silently. */
611
if(arg[0] == '\0'){
612
break;
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
619
494
default:
620
495
return ARGP_ERR_UNKNOWN;
621
496
}
622
return errno; /* Set to 0 at start */
497
return 0;
623
498
}
624
499
625
500
/* This option parser is the same as parse_opt() above, except it
626
501
ignores everything but the --config-file option. */
627
error_t parse_opt_config_file(int key, char *arg,
628
__attribute__((unused))
629
struct argp_state *state){
630
errno = 0;
631
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
632
506
case 'g': /* --global-options */
633
507
case 'G': /* --global-env */
634
508
case 'o': /* --options-for */
638
512
case 128: /* --plugin-dir */
639
513
break;
640
514
case 129: /* --config-file */
641
free(argfile);
642
515
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
516
if(argfile == NULL){
517
perror("strdup");
645
518
}
646
break;
519
break;
647
520
case 130: /* --userid */
648
521
case 131: /* --groupid */
649
522
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
case '?': /* --help */
652
case -3: /* --usage */
653
case 'V': /* --version */
654
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
655
525
break;
656
526
default:
657
527
return ARGP_ERR_UNKNOWN;
658
528
}
659
return errno;
529
return 0;
660
530
}
661
531
662
532
struct argp argp = { .options = options,
664
534
.args_doc = "",
665
535
.doc = "Mandos plugin runner -- Run plugins" };
666
536
667
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
668
538
config file location, if any. */
669
ret = argp_parse(&argp, argc, argv,
670
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
671
NULL, NULL);
672
switch(ret){
673
case 0:
674
break;
675
case ENOMEM:
676
default:
677
errno = ret;
678
error(0, errno, "argp_parse");
679
exitstatus = EX_OSERR;
680
goto fallback;
681
case EINVAL:
682
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
683
543
goto fallback;
684
544
}
685
545
687
547
argp.parser = parse_opt;
688
548
689
549
/* Open the configfile if available */
690
if(argfile == NULL){
550
if (argfile == NULL){
691
551
conffp = fopen(AFILE, "r");
692
552
} else {
693
553
conffp = fopen(argfile, "r");
694
}
554
}
695
555
if(conffp != NULL){
696
556
char *org_line = NULL;
697
557
char *p, *arg, *new_arg, *line;
698
558
size_t size = 0;
559
ssize_t sret;
699
560
const char whitespace_delims[] = " \r\t\f\v\n";
700
561
const char comment_delim[] = "#";
701
562
702
563
custom_argc = 1;
703
564
custom_argv = malloc(sizeof(char*) * 2);
704
565
if(custom_argv == NULL){
705
error(0, errno, "malloc");
706
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
707
568
goto fallback;
708
569
}
709
570
custom_argv[0] = argv[0];
710
571
custom_argv[1] = NULL;
711
572
712
573
/* for each line in the config file, strip whitespace and ignore
713
574
commented text */
714
575
while(true){
716
577
if(sret == -1){
717
578
break;
718
579
}
719
580
720
581
line = org_line;
721
582
arg = strsep(&line, comment_delim);
722
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
725
586
}
726
587
new_arg = strdup(p);
727
588
if(new_arg == NULL){
728
error(0, errno, "strdup");
729
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
730
591
free(org_line);
731
592
goto fallback;
732
593
}
733
594
734
595
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
759
603
}
760
604
custom_argv[custom_argc-1] = new_arg;
761
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
762
606
}
763
607
}
764
do {
765
ret = fclose(conffp);
766
} while(ret == EOF and errno == EINTR);
767
if(ret == EOF){
768
error(0, errno, "fclose");
769
exitstatus = EX_IOERR;
770
goto fallback;
771
}
772
608
free(org_line);
773
609
} else {
774
610
/* Check for harmful errors and go to fallback. Other errors might
775
611
not affect opening plugins */
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
777
error(0, errno, "fopen");
778
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
779
615
goto fallback;
780
616
}
781
617
}
782
/* If there were any arguments from the configuration file, pass
783
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
784
620
if(custom_argv != NULL){
785
ret = argp_parse(&argp, custom_argc, custom_argv,
786
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
787
NULL, NULL);
788
switch(ret){
789
case 0:
790
break;
791
case ENOMEM:
792
default:
793
errno = ret;
794
error(0, errno, "argp_parse");
795
exitstatus = EX_OSERR;
796
goto fallback;
797
case EINVAL:
798
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
799
626
goto fallback;
800
627
}
801
628
}
802
629
803
630
/* Parse actual command line arguments, to let them override the
804
631
config file */
805
ret = argp_parse(&argp, argc, argv,
806
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
807
NULL, NULL);
808
switch(ret){
809
case 0:
810
break;
811
case ENOMEM:
812
default:
813
errno = ret;
814
error(0, errno, "argp_parse");
815
exitstatus = EX_OSERR;
816
goto fallback;
817
case EINVAL:
818
exitstatus = EX_USAGE;
819
goto fallback;
820
}
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
838
637
}
839
638
840
639
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
640
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
641
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
642
p->name ? p->name : "Global", p->argc - 1);
844
643
for(char **a = p->argv; *a != NULL; a++){
845
644
fprintf(stderr, "\tArg: %s\n", *a);
846
645
}
847
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
848
647
for(char **a = p->environ; *a != NULL; a++){
849
648
fprintf(stderr, "\t%s\n", *a);
850
649
}
851
650
}
852
651
}
853
652
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
889
if(ret == -1){
890
error(0, errno, "setgid");
891
}
653
/* Strip permissions down to nobody */
892
654
ret = setuid(uid);
893
if(ret == -1){
894
error(0, errno, "setuid");
895
}
896
897
/* Open plugin directory with close_on_exec flag */
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
898
676
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
906
if(dir_fd == -1){
907
error(0, errno, "Could not open plugin dir");
908
exitstatus = EX_UNAVAILABLE;
909
goto fallback;
910
}
911
912
#ifndef O_CLOEXEC
913
/* Set the FD_CLOEXEC flag on the directory */
914
ret = set_cloexec_flag(dir_fd);
915
if(ret < 0){
916
error(0, errno, "set_cloexec_flag");
917
exitstatus = EX_OSERR;
918
goto fallback;
919
}
920
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
943
684
}
944
685
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
686
}
956
687
957
688
FD_ZERO(&rfds_all);
958
689
959
690
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
966
continue;
967
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
969
if(ret == -1){
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
973
continue;
974
}
975
691
while(true){
692
dirst = readdir(dir);
693
694
/* All directory entries have been processed */
695
if(dirst == NULL){
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
699
goto fallback;
700
}
701
break;
702
}
703
704
d_name_len = strlen(dirst->d_name);
705
706
/* Ignore dotfiles, backup files and other junk */
707
{
708
bool bad_name = false;
709
710
const char const *bad_prefixes[] = { ".", "#", NULL };
711
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
713
".dpkg-old",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
719
if(debug){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
722
}
723
bad_name = true;
724
break;
725
}
726
}
727
if(bad_name){
728
continue;
729
}
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
734
== 0)){
735
if(debug){
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
738
}
739
bad_name = true;
740
break;
741
}
742
}
743
744
if(bad_name){
745
continue;
746
}
747
}
748
749
char *filename;
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
if(ret < 0){
752
perror("asprintf");
753
continue;
754
}
755
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
759
free(filename);
760
continue;
761
}
762
976
763
/* Ignore non-executable files */
977
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
980
765
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
985
768
}
986
close(plugin_fd);
987
free(direntries[i]);
769
free(filename);
988
770
continue;
989
771
}
990
772
991
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
992
774
if(p == NULL){
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
775
perror("getplugin");
776
free(filename);
996
777
continue;
997
778
}
998
779
if(p->disabled){
999
780
if(debug){
1000
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
782
dirst->d_name);
1002
783
}
1003
close(plugin_fd);
1004
free(direntries[i]);
784
free(filename);
1005
785
continue;
1006
786
}
1007
787
{
1010
790
if(g != NULL){
1011
791
for(char **a = g->argv + 1; *a != NULL; a++){
1012
792
if(not add_argument(p, *a)){
1013
error(0, errno, "add_argument");
793
perror("add_argument");
1014
794
}
1015
795
}
1016
796
/* Add global environment variables */
1017
797
for(char **e = g->environ; *e != NULL; e++){
1018
798
if(not add_environment(p, *e, false)){
1019
error(0, errno, "add_environment");
799
perror("add_environment");
1020
800
}
1021
801
}
1022
802
}
1023
803
}
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
806
process, too. */
1026
807
if(p->environ[0] != NULL){
1027
808
for(char **e = environ; *e != NULL; e++){
1028
809
if(not add_environment(p, *e, false)){
1029
error(0, errno, "add_environment");
810
perror("add_environment");
1030
811
}
1031
812
}
1032
813
}
1033
814
1034
815
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
if(ret == -1){
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
820
goto fallback;
821
}
1056
822
/* Ask OS to automatic close the pipe on exec */
1057
823
ret = set_cloexec_flag(pipefd[0]);
1058
824
if(ret < 0){
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1064
827
goto fallback;
1065
828
}
1066
829
ret = set_cloexec_flag(pipefd[1]);
1067
830
if(ret < 0){
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1073
833
goto fallback;
1074
834
}
1075
#endif /* not O_CLOEXEC */
1076
835
/* Block SIGCHLD until process is safely in process list */
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
&sigchld_action.sa_mask,
1079
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1080
837
if(ret < 0){
1081
error(0, errno, "sigprocmask");
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1084
840
goto fallback;
1085
841
}
1086
842
/* Starting a new process to be watched */
1087
pid_t pid;
1088
do {
1089
pid = fork();
1090
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1091
844
if(pid == -1){
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1099
847
goto fallback;
1100
848
}
1101
849
if(pid == 0){
1102
850
/* this is the child process */
1103
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1104
852
if(ret < 0){
1105
error(0, errno, "sigaction");
1106
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1107
855
}
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1109
857
if(ret < 0){
1110
error(0, errno, "sigprocmask");
1111
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1112
860
}
1113
861
1114
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1115
863
if(ret == -1){
1116
error(0, errno, "dup2");
1117
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1118
866
}
1119
867
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
868
if(dirfd(dir) < 0){
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
871
closedir(dir);
872
}
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
875
perror("execv");
876
_exit(EXIT_FAILURE);
877
}
878
} else {
879
if(execve(filename, p->argv, p->environ) < 0){
880
perror("execve");
881
_exit(EXIT_FAILURE);
882
}
1126
883
}
1127
884
/* no return */
1128
885
}
1129
886
/* Parent process */
1130
887
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1133
if(new_plugin == NULL){
1134
error(0, errno, "getplugin");
1135
ret = (int)(TEMP_FAILURE_RETRY
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1137
NULL)));
888
free(filename);
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1138
893
if(ret < 0){
1139
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1140
895
}
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1143
897
goto fallback;
1144
898
}
1145
free(direntries[i]);
1146
899
1147
900
new_plugin->pid = pid;
1148
901
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
902
1155
903
/* Unblock SIGCHLD so signal handler can be run if this process
1156
904
has already completed */
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1158
&sigchld_action.sa_mask,
1159
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1160
906
if(ret < 0){
1161
error(0, errno, "sigprocmask");
1162
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1163
909
goto fallback;
1164
910
}
1165
911
1166
912
FD_SET(new_plugin->fd, &rfds_all);
1167
913
1168
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1169
915
maxfd = new_plugin->fd;
1170
916
}
917
1171
918
}
1172
919
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1177
free_plugin(getplugin(NULL));
1178
920
closedir(dir);
921
dir = NULL;
922
1179
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1180
924
if(p->pid != 0){
1181
925
break;
1186
930
free_plugin_list();
1187
931
}
1188
932
}
1189
933
1190
934
/* Main loop while running plugins exist */
1191
935
while(plugin_list){
1192
936
fd_set rfds = rfds_all;
1193
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1194
if(select_ret == -1 and errno != EINTR){
1195
error(0, errno, "select");
1196
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1197
941
goto fallback;
1198
942
}
1199
943
/* OK, now either a process completed, or something can be read
1200
944
from one of them */
1201
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1202
946
/* Is this process completely done? */
1203
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1204
948
/* Only accept the plugin output if it exited cleanly */
1205
949
if(not WIFEXITED(proc->status)
1206
950
or WEXITSTATUS(proc->status) != 0){
1207
951
/* Bad exit by plugin */
1208
952
1209
953
if(debug){
1210
954
if(WIFEXITED(proc->status)){
1211
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1212
" status %d\n", proc->name,
1213
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1214
957
WEXITSTATUS(proc->status));
1215
} else if(WIFSIGNALED(proc->status)){
1216
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1217
" signal %d: %s\n", proc->name,
1218
(intmax_t) (proc->pid),
1219
WTERMSIG(proc->status),
1220
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
962
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1221
965
}
1222
966
}
1223
967
1224
968
/* Remove the plugin */
1225
969
FD_CLR(proc->fd, &rfds_all);
1226
970
1227
971
/* Block signal while modifying process_list */
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1229
(SIG_BLOCK,
1230
&sigchld_action.sa_mask,
1231
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1232
973
if(ret < 0){
1233
error(0, errno, "sigprocmask");
1234
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1235
976
goto fallback;
1236
977
}
1237
1238
plugin *next_plugin = proc->next;
1239
978
free_plugin(proc);
1240
proc = next_plugin;
1241
1242
979
/* We are done modifying process list, so unblock signal */
1243
ret = (int)(TEMP_FAILURE_RETRY
1244
(sigprocmask(SIG_UNBLOCK,
1245
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1246
982
if(ret < 0){
1247
error(0, errno, "sigprocmask");
1248
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1249
985
goto fallback;
1250
986
}
1251
987
1252
988
if(plugin_list == NULL){
1253
989
break;
1254
990
}
1255
1256
991
continue;
1257
992
}
1258
993
1259
994
/* This process exited nicely, so print its buffer */
1260
995
1261
996
bool bret = print_out_password(proc->buffer,
1262
997
proc->buffer_length);
1263
998
if(not bret){
1264
error(0, errno, "print_out_password");
1265
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1266
1001
}
1267
1002
goto fallback;
1268
1003
}
1270
1005
/* This process has not completed. Does it have any output? */
1271
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1272
1007
/* This process had nothing to say at this time */
1273
proc = proc->next;
1274
1008
continue;
1275
1009
}
1276
1010
/* Before reading, make the process' data buffer large enough */
1277
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1282
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1283
1017
goto fallback;
1284
1018
}
1285
proc->buffer = new_buffer;
1286
1019
proc->buffer_size += BUFFER_SIZE;
1287
1020
}
1288
1021
/* Read from the process */
1289
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1290
proc->buffer
1291
+ proc->buffer_length,
1292
BUFFER_SIZE));
1293
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1294
1025
/* Read error from this process; ignore the error */
1295
proc = proc->next;
1296
1026
continue;
1297
1027
}
1298
if(sret == 0){
1028
if(ret == 0){
1299
1029
/* got EOF */
1300
1030
proc->eof = true;
1301
1031
} else {
1302
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1303
1033
}
1304
1034
}
1305
1035
}
1306
1307
1036
1037
1308
1038
fallback:
1309
1039
1310
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1311
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1312
1041
/* Fallback if all plugins failed, none are found or an error
1313
1042
occured */
1314
1043
bool bret;
1315
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1316
1045
char *passwordbuffer = getpass("Password: ");
1317
size_t len = strlen(passwordbuffer);
1318
/* Strip trailing newline */
1319
if(len > 0 and passwordbuffer[len-1] == '\n'){
1320
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1321
len--;
1322
}
1323
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1324
1047
if(not bret){
1325
error(0, errno, "print_out_password");
1326
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1327
1050
}
1328
1051
}
1329
1052
1330
1053
/* Restore old signal handler */
1331
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1332
1055
if(ret == -1){
1333
error(0, errno, "sigaction");
1334
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1335
1058
}
1336
1059
1337
1060
if(custom_argv != NULL){
1338
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1339
1062
free(*arg);
1341
1064
free(custom_argv);
1342
1065
}
1343
1066
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1067
if(dir != NULL){
1068
closedir(dir);
1348
1069
}
1349
1070
1350
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1351
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1352
1073
if(p->pid != 0){
1353
1074
close(p->fd);
1354
1075
ret = kill(p->pid, SIGTERM);
1355
1076
if(ret == -1 and errno != ESRCH){
1356
1077
/* Set-uid proccesses might not get closed */
1357
error(0, errno, "kill");
1078
perror("kill");
1358
1079
}
1359
1080
}
1360
1081
}
1361
1082
1362
1083
/* Wait for any remaining child processes to terminate */
1363
do {
1084
do{
1364
1085
ret = wait(NULL);
1365
1086
} while(ret >= 0);
1366
1087
if(errno != ECHILD){
1367
error(0, errno, "wait");
1088
perror("wait");
1368
1089
}
1369
1090
1370
1091
free_plugin_list();
1371
1092
1372
1093
free(plugindir);
1373
free(pluginhelperdir);
1374
1094
free(argfile);
1375
1095
1376
1096
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0